PROMOTER FOR SMOOTH MUSCLE CELL EXPRESSION

Abstract: Disclosed is a smooth muscle cell specific promoter, the SM22 alpha gene promoter as well as the murine cDNA and genomic SM22 alpha nucleic acid sequences. Also disclosed are methods of preventing restenosis following balloon angioplasty and methods of treating asthma based on inhibition of smooth muscle cell proliferation by expressing cell cycle control genes, or contraction inhibiting peptides in smooth muscle cells, under the control of the SM22 alpha promoter.

Description: DESCRIPTION PROMOTER FOR SMOOTH MUSCLE CELL EXPRESSION BACKGROUND OF THE INVENTION The government owns rights in the present invention pursuant to grant numbers R01- HL48257, U01 AI34566 and R01HL51 145 from the Public Health Service. The present invention relates generally to the fields of gene expression, particularly tissue specific expression, and more particularly smooth muscle cell specific expression. The invention also relates to cell proliferation diseases such as atherosclerosis, restenosis following balloon angioplasty and airway blockage in asthma. The phenotypic plasticity of smooth muscle cells (SMCs) permits this muscle cell lineage to subserve diverse functions in multiple tissues including the arterial wall, uterus. respiratory, urinary and digestive tracts. In contrast to fast and slow skeletal muscle cells which fuse and terminally differentiate before expressing contractile protein isoforms, SMCs are capable of simultaneously proliferating and expressing a set of lineage-restricted proteins including myofibrillar isoforms, cell surface receptors and SMC-restricted enzymes. Moreover, in response to specific physiological and pathophysiological stimuli. SMCs can modulate their phenotype by down-regulating a set of contractile protein genes, and in so doing, convert from the so called "contractile phenotype" to a de-differentiated "secretory phenotype" (Mosse et al. Lab Invest., 53:556-562, 1985; Owens et al, J. Cell Biol, 102:343-352, 1986; Rovner et al. , J. Biol. Chem., 261 : 14740-14745, 1986; Taubman et al.. J. Cell Biol, 104:1505-1513. 1987; Ueki et al, Proc. Natl Acad. Sci. USA, 84:9049-9053, 1987; Belkin et al, J. Biol Chem.. 263:6631-6635, 1988; Glukhova et al, Proc. Natl. Acad. Sci. USA., 85:9542-9546, 1988; Chaponnier et al. , Eur. J. Biochem., 190:559-565, 1990; Gimona e/ al, FEBSLetters, 274: 159-162, 1990; Shanahan et al. , Circ. Res., 73:193-204, 1993). This phenotypic modulation has been implicated in the pathogenesis of a number of disease states including atherosclerosis and restenosis following coronary balloon angioplasty (Ross, N. Engl J. Mecl. 314:488-500, 1986; Schwartz et al . Circ. Res., 58:427-440. 1986; Zanellato et al, Arteriosclerosis, 10:996-1009, 1990; Ross. Am. J. Pathol, 43:987-1002. 1993: Olson and Klein, Genes Dev., 8:1-8, 1994) and may also contribute to the airway remodeling seen in asthma (James et al, Am. Rev. Respir. Dis., 139:242-246, 1989). Restenosis following coronary balloon angioplasty is a major problem, and contributes to the 40% failure rate of this procedure (Schwartz et al . 1992; Liu et al , Circ. 79: 1374-1387, 1989). Restenosis occurs because the smooth muscle cells are stimulated to proliferate after angioplasty and thus block the arterial wall. Because of restenosis, balloon angioplasty is used mainly for palliation in patients who are not acceptable candidates for open heart surgery {Scientific American Medicine, Rubenstein and Federman, Eds., March 1993, Section 1, XII, page 1 1). A method is needed, therefore, to control or inhibit the proliferation of smooth muscle cells after angioplasty. Although RDAd efficiently transduce both resting and proliferating SMCs in vivo, a potential limitation of their use in the clinical setting is their capacity to infect and program transgene expression in many different cell lineages and tissues (Ohno et al, Science. 265 (5173):781-784, 1994; Haddada et al, Current Topics in Microbiology & mmunolog,. 199 (Pt 3):297-306, 1995). For example, localized arterial administration of RDAd results in efficient infection of endothelial cells, vascular SMCs and adventitial cells (French et al.. Circulation, 90 (5):2402-2413, 1994; Simari et al, J. Clin. Invest., 98 (l):225-235, 1996). Moreover, intravenous administration of these vectors results in high-level gene transfer to the liver and lung (Kashyap et al, J. Clin. Invest. 96 (3): 1612-1620, 1995; Johns et al . J. Clin. Invest. 96 (2): 1152-1 158, 1995; Miller and Vile, FASEB Journal, 9 (2): 190-199. 1995). Several approaches have been used in an attempt to circumvent this problem. First, it has been possible to restrict the expression of a viral transgene to a specific cell or tissue by administering the virus ex vivo. However, this approach is laborious and is not practical for the treatment of most vascular proliferative disorders. A second approach has involved delivery of adenoviral particles locally within the vasculature (to the site of vessel wall injury) or within a tissue (Ohno et al, 1994; Chang et al. Science, 267:518-522. 1995a: Guzman et al, 1994; Chang et al, Mol. Medicine, 1 : 172-181, 1995b). Specially-modified catheter delivery systems including coated-balloons and intravascular stents have been designed in order to achieve high local concentrations of adenovirus within the vasculature (March et al, Human Gene Therapy, 6 (l):41-53, 1995; Rajasubramanian et al . ASAIO Journal. 40 (3):M584-M589, 1994; Kito et al, ASAIO Journal 40 (3):M260-M266, 1994). However, the usefulness of these approaches may be limited within the human coronary circulation due to the high frequency of side branches. Moreover, such catheter delivery systems do not restrict transgene expression to specific cell types in the vessel wall. Finally, several groups have reported that the tissue-tropism of RDAd can be modified by electrostatically conjugating adenoviral proteins to ligands that can bind specifically to tissue- specific cell-surface receptors (Krasnykh et al, Journal of Virology, 70 ( 10):6839-6846, 1996). This approach has been used to successfully target RDAd to hepatocytes and hematopoietic progenitor cell lines (Schwarzenberger et al, Blood, 87 (2):472-478, 1996). The use of tissue-specific transcriptional regulatory elements represents an alternative strategy to restrict adenoviral transgene expression to specific cell lineages or tissues in vivo (Miller and Vile, 1995). While theoretically appealing, this strategy is potentially limited because the adenovirus genome contains multiple highly active transcriptional enhancers that are capable of transactivating a variety of different promoters in multiple cell lineages (Haddada et al, 1995). Such a targeting strategy is particularly problematic in smooth muscle cells because of the lack of smooth muscle cell-specific transcriptional regulatory elements that function in vivo. Thus, there is still a need for discovery of a smooth muscle cell specific promoter that is not expressed in other types of cells and is constitutively expressed in both quiescent and proliferating cells and that maintains its tissue specificity when administered to an animal. SUMMARY OF THE INVENTION The present invention seeks to overcome these and other drawbacks in the prior art by providing a promoter that is capable of expression of a heterologous gene in a tissue specific manner, in particular, smooth muscle cells, and by offering the further advantage that the control of expression directed by the promoter is constitutive and cell cycle independent. The promoter of the present invention thus promotes transcription in both resting and proliferating cells, in contrast to other known smooth muscle cell promoters that are down-regulated in proliferating cells. This promoter may be used therefore, to express heterologous proteins or mRNAs in proliferating smooth muscle cells and to control proliferative diseases or to promote angiogenesis, for example. The invention may be described, in certain embodiments, as an isolated nucleic acid segment comprising an SM22 promoter sequence operatively linked to a heterologous gene and capable of directing expression of that gene. The isolated SM22α promoter may be described as the region immediately upstream of the transcriptional start site of the murine SM22 gene. As described herein a nucleic acid segment having a sequence according to bases 899-1382 of SEQ ID NO:l , is also effective to promote transcription in a smooth muscle cell and a nucleic acid segment having that sequence or the transcriptional control elements of that sequence would also fall within the scope of the claimed invention. Such homologous promoters may be isolated from an animal sequence, such as from a mouse, pig, rat, hamster, rabbit or even a human genome or cDNA library using any of the sequences disclosed herein as a molecular probe. In addition, based on the present disclosure, one of skill might construct such a promoter by splicing elements taken from various sources including, but not limited to, chemically synthesized nucleic acid molecules, or elements removed from other naturally occurring promoters, or from the SM22α promoter. It is understood that any such promoter, or a promoter having the essential elements of the promoter disclosed herein and useful to express a heterolgous nucleic acid sequence would be encompassed by the spirit and scope of the invention claimed herein. The promoter region of the present invention may be defined as comprising that region of the genome immediately upstream (5') of the structural SM22α gene, and controlling expression of that gene. For example, the promoter may comprise the region of up to 30, 40, 50, 100, 500, 1,000, 1,500, 2,000 or even up to 5,000 bases directly upstream of the transcriptional start site of the SM22α gene, and more specifically, an SM22α promoter of the present invention may be described as an isolated nucleic acid segment that comprises a contiguous sequence of bases 1-1381 (-1338 to +41) of SEQ ID NO:l . The designations of -1338 to +41 and the like indicate the position of a base relative to the transcriptional start site (+1 ), which, in the murine genome, is disclosed herein to be base 1341 of SEQ ID NO: 1. The promoter of the present invention may also be described as an isolated nucleic acid segment that comprises a contiguous sequence of bases 899-1381 (-441 to +41) of SEQ ID NO: l . Certain elements of the promoter that are identified in light of the present disclosure are a TATA box 29-bp 5' of the start site, five consensus E boxes/bHLH myogenic transcription factor binding sites located at bps -534, -577, -865, -898, -910, and -1267, three consensus GATA-4 binding sites located at bps -504, -828, -976, two AT-rich, potential MEF-2/rSRF binding sites located at bps -407 and -770 and at least one cis-acting, positive transcriptional regulatory element contained by bp -435 to -416. In addition, the promoter of the present invention contains consensus CArG/SRF binding sites located at bps -150 and -273 and one CACC box located at bp -104. Thus, the promoter of the present invention may comprise some or all of the elements described in the previous paragraph. Such elements may be isolated and recombined by techniques well known in the art to produce a smooth muscle cell specific promoter that may be smaller than the 441 to 482 bases disclosed herein as a minimal sequence required for constitutive smooth muscle cell transcription. It is also known that certain stretches of sequence in the promoter are required for spacing of the cis acting elements and that any sequence that does not impart haiφin loops or other deleterious structural properties may be substituted for those regions so long as the spacing and conformation remains the same. It is understood that all such promoters would be encompassed by the present invention. The isolated nucleic acid segments of the present invention may also be defined as comprising a nucleic acid sequence or even a gene operatively linked to an isolated SM22α promoter sequence. Operatively linked is understood to mean that the gene is joined to the promoter region such that the promoter is oriented 5' to the gene and is of an appropriate distance from the transcription start site, so that the transcription of the gene will be dependent on or controlled by the promoter sequence. The arts of restriction enzyme digestion and nucleic acid ligation to be used in construction of a promoter-gene construct are well known in the art as exemplified by Maniatis et al, Molecular Cloning, A Laboratory- Manual. Cold Spring Harbor, New York, 1982, (incoφorated herein by reference). Therefore one would, using standard techniques, prepare a gene by restriction enzyme digestion to have a compatible end sequence, or even a blunt end, to be ligated downstream of the SM22α promoter. The restriction enzyme recognition site may be a naturally occurring sequence, or a sequence generated by site directed mutagenesis, by a PCR™ primer sequence or by any other means known in the art. Alternatively, one might chemically synthesize a gene or gene fragment or an oligonucleotide containing an appropriate restriction enzyme recognition sequence or one might prepare a gene by any of several methods known in the art. The gene or nucleic acid segment may be, for example, a structural gene that encodes a full length protein, a portion or part of a protein, or a peptide that one desires to express in a smooth muscle cell. The gene may also encode an RNA sequence, such as an antisense oligonucleotide sequence, or even a regulatory sequence that affects the expression of another gene or genes. In certain preferred embodiments of the invention, the gene will be a cell cycle control gene, such as a retinoblastoma (Rb) gene, a phosphorylation deficient Rb gene, p53, p21, pl6, p27, a cell cycle dependent kinase inhibitor, E2F inhibitor, a CDK kinase or a cyclin gene; alternatively the gene will be an angiogenesis gene such as VEGF, iNOS, eNOS. basic FGF or FGF-5, or the gene may be a cytotoxic gene such as a herpes simplex thymidine kinase gene, or any other gene, the expression of which will affect proliferation of the smooth muscle cells in which the gene is expressed, and/or endothelial cells in such a ways as to effect the growth of new blood vessels. Alternatively, the nucleic acid segment may encode an antisense RNA effective to inhibit expression of a cell cycle control gene or regulatory element. Antisense constructs are oligo- or polynucleotides comprising complementary nucleotides to the control regions or coding segments of a DNA molecule, such as a gene or cDNA. Such constructs may include antisense versions of both the promoter and other control regions, exons, introns and exon:intron boundaries of a gene. Antisense molecules are designed to inhibit the transcription, translation or both, of a given gene or construct, such that the levels of the resultant protein product are reduced or diminished. Antisense RNA constructs, or DNA encoding such antisense RNAs, may be employed to inhibit gene transcription or translation or both within a host cell, either in vitro or in vivo, such as within a host animal, including a human subject. Of course, the antisense constructs have evident utility in the types of nucleic acid hybridization described herein. The gene may also encode an antigenic sequence and the necessary leader sequence for transport to the cell surface, or it may encode an enzyme, or an intracellular signal protein or peptide. or it may even encode an SM22α gene or SM22α cDNA gene. Particularly preferred is a constitutively active form of the Rb gene product that inhibits cellular proliferation, disclosed in Chang et al, 1995a (incoφorated herein by reference). The present invention may also be described, in certain embodiments, as a recombinant vector that is capable of replication in an appropriate host cell and that comprises an SM22 promoter sequence as disclosed herein, including an SM22α promoter operatively linked to a gene or nucleic acid segment. Preferred vectors include, but are not limited to. a plasmid, a raus sarcoma virus (RSV) vector, a p21 viral vector, an adeno- associated viral vector or an adenoviral vector. In addition, a variety of viral vectors, such as retroviral vectors, heφes simplex virus (U.S. Patent 5,288,641 , incorporated herein by reference), cytomegalovirus, and the like may be employed, as described by Miller (Microbiol Immunol., 158:1, 1992, incoφorated herein by reference). Recombinant adeno- associated virus (AAV) and AAV vectors may also be employed, such as those described in U.S. Patent 5,139,941, incoφorated herein by reference. Recombinant adenoviral vectors are currently preferred. Techniques for preparing replication-defective infective viruses are well known in the art, as exemplified by Ghosh-Choudhury & Graham. Biochem Bwphys Res Comm , 147:964-973 (1987); McGrory et al, Virology, 163:614-617, (1988); and Gluzman et al. In. Eukaryotic Viral Vectors (Gluzman, Y., Ed.) pp. 187-192, Cold Spring Harbor Press, Cold Spring Harbor, New York, (1982), each incoφorated herein by reference. Also preferred are plasmid vectors designed for increased expression such as those described in Tripathy et al. , Proc Natl. Acad. Sci. USA, 93 : 10876-80, 1996. A preferred adenovirus used in the practice of the present invention is replication- defective and particularly those that lack the early gene region El or the early gene regions El and E3. For example, the foreign DNA of interest, such as the smooth muscle specific transcriptional regulatory sequence of the present invention may be inserted into the region of the deleted El and E3 regions of the adenoviral genome. In this way, the entire sequence is capable of being packaged into virions that can transfer the foreign DNA into an infectable host cell. A preferred adenovirus is a type 5 adenovirus and a SM22 promoter and coding sequence are preferably flanked by adenovirus type 5 sequences. The invention may be described in certain embodiments as a replication deficient adenoviral vector, wherein the vector comprises a smooth muscle cell specific transcriptional regulatory segment. Preferred smooth muscle cell specific transcriptional regulatory segments include, but are not limited to an SM22α promoter, a smooth muscle calponin promoter, a smooth muscle myosin heavy chain promoter, a smooth muscle alpha actin promoter, a smooth muscle alpha actin enhancer, a telokin promoter, a smooth muscle gamma-actin promoter or a smooth muscle gamma-actin enhancer. In addition, the enhancer elements may be included in an adenoviral vector of the present invention in combination with a promoter segment. A smooth muscle cell specific transcriptional regulatory segment of the present invention may be isolated from any source such as a mammal or a bird, for example, and including but not limited to a mouse, pig, rat, rabbit, human or chicken. Specific examples of such segments would include a mouse smooth muscle calponin promoter (bases 1 - 1216 of Genbank accession #U38929, or the promoter sequence of Genbank accession #U37071. or bases 1-631 of Genbank accession #L49022); a smooth muscle myosin heavy chain promoter from a mouse (bases 1-1536 of Genbank accession # U53469), a rat (bases 1- 1699 of Genbank accession #U55179, or bases 1-2425 of Genbank accession #U83321), or a rabbit (bases 1 -2267 of Genbank accession #U15514); a human smooth muscle alpha actin promoter (bases 1-1746 of Genbank accession #D00618, or bases 1-892 of Genbank accession #J05193) or a human smooth muscle alpha actin enhancer (bases 1789-5559 of Genbank accession #D00618): a chicken smooth muscle alpha actin promoter (bases 1 - 1013 of Genbank accession #M 13756. D00041, N00041), a mouse smooth muscle alpha actin promoter (bases 1- 1074 of Genbank accession #M57409, M35194), a rat smooth muscle alpha actin promoter (Genbank accession #S76011); a rabbit telokin promoter (bases 1-3460 of Genbank accession #U40712); a mouse smooth muscle gamma-actin promoter (bases 1-1076 of Genbank accession #U 19488) or a mouse smooth muscle gamma-actin enhancer (bases 1 123-5703 of Genbank accession #U 19488). (All sequences discussed in this paragraph incoφorated herein by reference). The smooth muscle cell specific regulatory element or segment may be operatively linked to a gene or nucleic acid segment as defined above, i.e. it may be a cell cycle control gene, such as a retinoblastoma (Rb) gene, a phosphorylation deficient Rb gene. p53. p21, pi 6. p27, a cell cycle dependent kinase inhibitor, E2F inhibitor, a CDK kinase or a cyclin gene; alternatively the gene will be an angiogenesis gene such as VEGF, iNOS, eNOS. basic FGF or FGF-5, or the gene may be a cytotoxic gene such as a herpes simplex thymidine kinase gene. In certain embodiments of the invention, the vector of the present invention is dispersed in a pharmaceutically or pharmacologically acceptable solution. Preferred solutions include neutral saline solutions buffered with phosphate, lactate, Tris, and the like. Of course, one will desire to purify the vector sufficiently to render it essentially free of undesirable contaminant, such as defective interfering adenovirus particles or endotoxins and other pyrogens such that it will not cause any untoward reactions in the individual receiving the vector construct. A preferred means of purifying the vector involves the use of buoyant density gradients, such as cesium chloride gradient centrifugation. The present invention may also be described, in certain embodiments, as a method of expressing a gene in a smooth muscle cell comprising the steps of: obtaining an isolated nucleic acid segment comprising a gene operatively linked to an SM22 promoter region; transferring that nucleic acid segment into a smooth muscle cell; and maintaining the smooth muscle cell under conditions effective to express the gene. In this method of the invention, the SM22α promoter region preferably includes bases -441 to +41 of the SM22α gene (899- 1382 of SEQ ID NO:l) or even bases -441 to +1 of the murine SM22α gene (899-1341 of SEQ ID NO:l) and may include up to 5,000 bases of the SM22α promoter. In the practice of this method, the heterologous gene is preferably a reporter gene, a cell cycle control regulatory gene, an angiogenesis gene, a virally encoded gene such as herpes simplex virus thymidine kinase (Chang, et. al., 1995b), an antisense molecule, or it may encode a muscle contraction inhibiting peptide, and may encode an Rb gene product or a peptide having the sequence MIRICRKK, SEQ ID NO: 19, or any gene or obvious variant of any gene as described above. The Rb gene may be the wild type Rb gene or it may be an altered gene such that the gene product is phosphorylation deficient. It is apparent from the present disclosure that it may not be necessary to collect the gene product in the practice of the present method. For example, if the gene product is a cell cycle regulatory element, or a contraction inhibiting peptide, then the cell itself will be the target of that effect and the utility of the method will not depend on collecting or even on identifying a protein product. However. certain gene products will have utility as markers of gene expression and as useful proteins or peptides produced by a recombinant cell. In addition, the present invention may be described as a method of inhibiting smooth muscle cell proliferation comprising the steps of: obtaining an isolated nucleic acid segment comprising a cell cycle regulatory gene operatively linked to an SM22α promoter region; transferring the nucleic acid segment into a smooth muscle cell to obtain a transfected cell: and maintaining the smooth muscle cell under conditions effective to express the cell cycle regulatory gene; wherein expression of the cell cycle regulatory gene inhibits proliferation of the smooth muscle cell. In the practice of the method, the cell cycle regulatory gene operatively linked to an SM22α promoter region may comprise a viral vector, a plasmid vector or it may comprise an adenoviral vector. Further, the cell cycle regulatory gene ma} preferably encode Rb, a phosphorylation deficient Rb gene, p53, p21, pl6, p27. a cell cycle dependent kinase inhibitor, E2F inhibitor, a CDK kinase or a cyclin gene, for example. The present invention may also be described in certain broad aspects as a method of preventing restenosis in a subject following balloon angioplasty of either a coronary arten . renal artery, peripheral artery or carotid artery, for example. In addition, the present invention may be described in certain broad embodiments as a method of preventing restenosis in a subject following balloon angioplasty of a vein as would be used in a coronary artery bypass surgery, or other bioprosthetic grafts that might be used in the periphery. This method comprises the steps of obtaining a viral vector comprising a cell cycle regulatory gene operatively linked to an SM22 promoter region dispersed in a pharmaceutically acceptable solution and administering the solution to the subject. The subject may be an animal subject and is preferably a human subject. In the practice of the method, the viral vector is preferabh a replication defective adenoviral vector and the gene may preferably encode herpes simplex thymidine kinase, p53, Rb, a phosphorylation deficient Rb gene, p53, p21 , pl6. p27, a cell cycle dependent kinase inhibitor, E2F inhibitor, a CDK kinase or a cyclin gene. An aspect of the invention is also a method of screening for identifying smooth muscle cell specific transcriptional control elements and particularly those elements that work in trans. The method as provided herein preferably employs a reporter gene that confers on its recombinant hosts a readily detectable phenotype that is either expressed or inhibited, as the case may be. Generally reporter genes encode (a) a polypeptide not otherwise produced by the host cell; or (b) a protein or factor produced by the host cell but at lower levels; or (c) a mutant form of a polypeptide produced by the host cell. Preferably the gene encodes an enzyme which produces colorimetric or fluorometric change in the host cell which is detectable by in situ analysis and which is a quantitative or semi-quantitative function of transcriptional activation. Exemplary enzymes include esterases, phosphatases, proteases (tissue plasminogen activator or urokinase) and other enzymes capable of being detected by activity that generates a chromophore or a fluorophore as will be known to those of skill in the art. Examples of such a reporter gene are the E. coli β-galactosidase (β-gal) and firefly luciferase genes. The β-gal enzyme produces a color change upon cleavage of the indigogenic substrate, indolyl-β-D-galactoside by cells expressing β-galactosidase. Thus, this enzyme facilitates automatic plate reader analysis of expression directly in microtiter wells containing transformants treated with candidate activators. Also, since the endogenous β- galactosidase activity in mammalian cells ordinarily is quite low, the analytic screening system using β-galactosidase is not hampered by host cell background. This enzyme offers the further advantage that expression can be monitored in vivo by tissue analysis as described below. Another class of reporter genes that confers detectable characteristics on a host cell are those that encode polypeptides, generally enzymes, that render their transformants resistant against toxins, e.g., the neo gene, which protects host cells against toxic levels of the antibiotic G418; a gene encoding dihydrofolate reductase, which confers resistance to methotrexate, or the chloramphenicol acetyltransferase (CAT) gene. Other genes for use in the screening assay herein are those capable of transforming hosts to express unique cell surface antigens, e.g. viral env proteins such as HIV gpl20 or heφes gD, which are readily detectable by immunoassays. In certain embodiments, the present invention may be described as a recombinant vector comprising an isolated SM22α promoter positioned adjacent a gene in a position to control expression of the gene. The splicing of nucleic acid sequences is well known in the art as described above and the insertion of such genes into vectors is also well known in the art. The vector of the present invention may be a plasmid, a phagemid, a replication defective adenovirus, an adeno-associated virus or a retrovirus. for example. The type of vector does not necessarily in and of itself define the present invention, and therefore in certain embodiments, any vector that can transfer genetic material into a cell to be expressed in that cell will be useful in the present invention. It is also understood that the nucleic acid segments may be transferred into a cell by means such as liposomes, receptor ligand carriers, mechanical means such as electroporation, etc. and that all such embodiments are encompassed within the claimed invention. However, the recombinant vector of the present invention preferably is a replication deficient adenovirus or a high expression plasmid comprising an SM22α promoter operatively joined to a gene, and wherein the gene may be a cell cycle control gene, such as a retinoblastoma (Rb) gene, a phosphory lation deficient Rb gene, p53, p21, pl6, p27. a cell cycle dependent kinase inhibitor, E2F inhibitor, a CDK kinase or a cyclin gene; alternatively the gene may be an angiogenesis gene such as VEGF, iNOS, eNOS, basic FGF or FGF-5: or the gene may be a cytotoxic gene such as a herpes simplex thymidine kinase gene. It is understood that the method of inhibiting muscle contraction will have utility in the treatment of palliation of a variety of diseases that arise from muscle cell contraction. Such diseases include, but are not limited to Prinzmetal's angina, hypertension. Raynaud's phenomenon, migraine headache, a variety of collagen vascular diseases such as ELS, scleroderma, pulmonary hypertension, coronary arterial vasospasm, in contractile disorders of smooth muscle cells in the eye, gut, uterus, bladder, spleen, etc., or even in striated muscle spasms in paralysis victims. In a certain broad aspect the present invention may be described as a method of promoting angiogenesis in a subject comprising the steps of obtaining a nucleic acid segment comprising an angiogenesis factor gene operatively linked to an SM22α promoter region; and transferring the nucleic acid segment into a smooth muscle cell to obtain a transfected cell; wherein expression of the nucleic acid segment in the smooth muscle cell promotes angiogenesis. In the practice of the method, the smooth muscle cell may be a coronary arterial or venous smooth muscle cell, or it may be a peripheral arterial or venous smooth muscle cell. A preferred angiogenesis factor is VEGF. iNOS, eNOS. basic FGF or FGF-5. In certain embodiments of the method, the nucleic acid segment comprising an angiogenesis factor gene operatively linked to an SM22α promoter region is contained in a viral or plasmid vector and the vector is administered to a subject. In certain alternate embodiments, the transferring is done ex vivo and the method further comprises the steps of seeding a bioprosthetic graft or stent with the transfected cells to obtain a seeded graft or stent; and placing the seeded graft or stent into a coronary or peripheral artery or vein of a subject. The present invention may also be described in certain broad aspects as a method of inhibiting smooth muscle proliferation comprising the steps of obtaining a nucleic acid segment comprising a cell cycle regulatory gene operatively linked to an SM22α promoter region; transferring the nucleic acid segment into a primary smooth muscle cell in vivo or ex vivo to obtain a transfected cell; seeding a bioprosthetic graft or stent with the transfected cell to obtain a seeded graft or stent; and placing the seeded graft or stent into a coronary or peripheral artery or vein of a subject, wherein expression of the cell cycle regulatory gene inhibits proliferation of a smooth muscle cell. The GenBank accession number for the murine SM22α cDNA is L41 154. The GenBank accession number for the murine SM22α gene is L41161. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 Cellular-specificity of the 441-bp SM22 promoter. The p-441 SM221uc (black bar) and pRSVL (hatched bar) plasmids were transiently transfected into primary rat aortic SMCs (VSMC). A7r5, NIH 3T3 (3T3), COS-7, and Hep G2 cells and the normalized luciferase activities for each respective plasmid was determined. Data are expressed as normalized luciferase light units + S.E.M. FIG. 2 Schematic representation of the c/ -acting elements and the trans-acting factors identified DNase I footprint and EMSAs analyses that bind to the SM22 promoter. Six nuclear protein binding sites were identified by DNase I footprint analysis in the 441-bp arterial SMC-specific SM22α promoter that were designated SME-1-6, respectively. Trans -acting factors identified by EMS A that bind to each nuclear protein binding site are shown above or below each c .s-acting element. Binding sites for SRF and ternary complex factors (T) (SME-1 and SME-4). Spl (SME-1 , -2, -5, -6), YY1 (SME-3, -4, - 6), CREB-1 (SME-6) and ATF-1 (SME-6) were identified. Nuclear protein complexes that could not be positively identified by antibody supershift reactions are shown in gray below the nuclear protein binding site to which they bind. FIG. 3 A. Schematic representations of the AdSM22-lacZ and AdCMV-lacZ adenoviral vectors. The AdSM22-lacZ vector (upper panel) encodes the bacterial lacZ reporter gene (black box) and bovine growth hormone polyadenylation signal (box with horizontal lines) under the transcriptional control of the 441-bp murine SM22α promoter (box with diagonal lines) and the 450-bp human 4F2 transcriptional enhancer (white box). The El and E3 regions of the Ad5Sub360 adenoviral genome were deleted (ΔF3) rendering the virus replication-defective. The AdCMV-lacZ control virus encodes the lacZ reporter gene (black box) under the transcriptional control of the cytomegalovirus immediate early gene promoter enhancer (box filled with dots). FIG. 3B. Comparison of the activity of AdSM22-lacZ and the AdCMV-lacZ control virus in primary cultures of rat aortic smooth muscle cells (VMSC) and human umbilical vein endothelial cells (HUVEC). Primary cultures of VSMCs or HUVECs were infected with 1 -, 10-, and 100-PFU of either AdSM22-lacZ (black squares-FIUVEC and black circles-VSMC) or AdCMV-lacZ (open squares -HUVEC and open circles-VSMC) and the % of cells expressing β-galactosidase activity was quantitated 72-h post-infection. Data are expressed as the mean percentage of cells expressing βgal activity ± S.E.M. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention arises from the isolation and characterization of a smooth muscle cell specific promoter region that, in its naturally occurring state, controls the expression of the SM22 gene, and the discovery that this isolated promoter region may be operatively joined to a heterologous structural gene and will control the expression of that gene specifically in smooth muscle cells and other myogenic cell lineages including an embryonic skeletal muscle cell. An important element of the present invention is that, unlike other known smooth muscle cell promoters, the SM22α promoter is cell cycle independent and is thus not down-regulated when the cell enters the proliferative state. The promoter sequence of the present invention will be useful in the expression of heterologous genes in a smooth muscle cell, in the discovery of trans and cis acting transcriptional control elements that affect smooth muscle cell gene expression and as a probe to isolate SM22α genes and promoters. In particular, the present invention will find use in the prevention of restenosis following balloon angioplasty or other arterial injury, in the treatment of artherosclerosis or peripheral vascular occlusive disease, in the promotion of angiogenesis in graft or stent implants and in the treatment or prevention of asthma, among other smooth muscle cell proliferative diseases. As an embodiment of the present invention, a recombinant replication-defective adenoviral vector (RDAd) was generated, designated AdSM22-lacZ, which contains the bacterial lacZ reporter gene under the transcriptional control of the SMC-specific SM22α promoter (Solway et al., .1. Biol. Chem., 270 (22): 13460-13469, 1995; Kim et al. Mol. Cell. Biol, (17):2266-2278, 1997; Li et al, J. Cell Biol , 132:849-859, 1996b). As shown herein, this adenoviral construct, AdSM22-lacZ, programs SMC-specific expression of the lacZ reporter gene in cultured cells. In addition, the SMC-specificity of the AdSM22-lacZ virus is maintained in vivo following intra-arterial, intra-muscular and intravenous administration. Finally, AdSM22-lacZ programs transgene expression in visceral, as well as vascular SMCs in vivo. It is an important discovery, as disclosed herein, that the expression of a recombinant gene product encoded by a RDAd can be regulated in a cell-lineage restricted fashion by a transcriptional regulatory element in normal cells in vivo. The present inventors have previously generated adenoviral vectors containing other cell lineage-specific transcriptional regulatory elements and observed that the majority of these elements lose their cell lineage- specificity when tested in vivo in the context of an adenoviral vector. Similarly. Arbuthnot et. al. reported that RDAd containing transgenes under the transcriptional control of the alpha- fetoprotein (AFP) promoter are capable of mediating cell lineage-restricted gene expression in hepatoma cells, but not in normal liver parenchyma (Arbuthnot et al. Human Gene Therapy. 7 (13): 1503-1514, 1996). Without restricting the present invention to any particular theory, it is possible that the murine SM22α promoter may contain an insulator element or a locus control region that is capable of protecting it from the activity of cryptic transcriptional regulatory elements located within the adenoviral genome. In this regard, the murine SM22α promoter is as active as the most potent viral LTRs in SMCs (Solway et al. 1995), and functions in a SMC-specific fashion both in vitro and in transgenic mice in vivo (Kim et al, 1997; Li et al, 1996b; Moessler et al, Development, 122:2415-2425, 1996). It is contemplated, therefore, that an insulator element, when isolated from an SM22α promoter will be useful as a means of conferring tissue specificity to those tissue specific promoters that lose tissue specificity when expressed from an adenoviral vector. Furthermore, in transgenic mice the SM22 promoter is active in arterial, but not visceral SMCs (Li et al, Circ. Res., 78:188-195, 1996a; Kim et al , 1997). Therefore, the demonstration described herein that the lacZ reporter gene encoded by AdSM22-lacZ was expressed in visceral, as well as, vascular SMCs was somewhat suφrising. Again, without relying on any particular theory, this difference may reflect the fact that in adenovirus- infected cells DNA remains episomal, whereas, in transgenic mice it is integrated into the host genome where its transcriptional activity can be-modulated by alterations in chromatin structure. RDAd are particularly useful tools for studying the molecular pathogenesis of atherosclerosis and other vascular proliferative disorders. Adenoviruses can be delivered in spatially- and temporally-restricted fashions to the vessel wall in both normal and atherosclerotic vessels in large and small animals (French et al, 1994; Simari et al, 1996). However, previous studies using these vectors to investigate the pathogenesis of vascular proliferative disorders have not been able to distinguish effects due to alterations in vascular SMC gene expression from those resulting from transgene expression in endothelial or adventitial cells. In this respect, RD Ad-containing transgenes under the control of the SM22α promoter allow one to determine directly the effects of SMC-specific transgene expression on vascular SMC proliferation and neointima formation. In addition, because SM22 containing RDAd program transgene expression in visceral SMCs. these viruses may also be useful to examine the pathogenesis and treatment of diseases mediated by visceral SMCs. Examples of such diseases include asthma, achalasia, leiomyosarcomas, irritable bowel syndrome and uterine leiomyomas. Although the efficacy of RDAd have been established in both large and small animal models of vascular proliferative disease (Ohno et al, 1994; Chang et al, 1995a; Guzman et al, 1994; Yang et al, Proc. Natl. Acad. Sci. USA, 93 (15):7905-7910, 1996; Chang et al, 1995b), safety concerns persist due to the capacity of these viruses to infect most cells and tissues. In this regard, SM22 promoter-driven adenoviruses may prove advantageous as vehicles to deliver therapeutic genes to the vessel wall for the treatment of vascular proliferative disorders. The lack of cytotoxic or cytostatic transgene expression in the endothelial cells at the margins of the arterial injury should, in theory, promote more rapid re- endothelialization of the injured vessel by facilitating the proliferation and migration of adjacent endothelial cells (Ohno et al, 1994). Of equal importance, the potential for systemic toxicity resulting from ectopic expression of potentially toxic adenovirus-encoded transgenes in other tissues and organs should be reduced by use of the SMC-specific SM22 promoter. Finally, recent reports have demonstrated that much of the immunogenicity of adenovirus infected cells is due to cellular and humoral immune responses directed against foreign transgene proteins (Kashyap et al, 1995). By restricting ectopic expression of adenovirus- encoded transgenes in non-SMC containing tissues, AdSM22 viruses may also reduce the immune-mediated damage to organs such as the liver and the lung following intentional or inadvertent systemic administration of the vector, as indicated by the finding of decreased hepatic toxicity following IV administration of high dose AdSM22-lacZ. In one aspect, the present invention provides a process of directing and regulating gene expression in a smooth muscle cell. In accordance with that process, a gene operatively joined to an SM22α promoter is delivered to a smooth muscle cell and the smooth muscle cell is then maintained under physiological conditions and for a period of time sufficient for the gene to enter the smooth muscle cell, for the gene to be transcribed and in certain embodiments, for the product of that gene to be expressed. Delivery is preferably by transfection with a plasmid or a high expression plasmid. replication defective adenovirus, adeno-associated virus. p21 virus, raus sarcoma virus, or other virus vector construct capable of transfecting a smooth muscle cell, and comprising an SM22α promoter operatively joined to a coding sequence that encodes the gene product. The use of adenovirus as a vector for cell transfection is well known in the art. Adenovirus vector-mediated cell transfection has been reported for various cells (Stratford- Perricaudet, et al, J. Clin. Invest, 90, 626-630, 1992). An adenovirus vector of the present invention is replication defective. A virus is rendered replication defective by deletion of the viral early region 1 (El) region. An adenovirus lacking an El region is competent to replicate only in cells, such as human 293 cells, which express adenovirus early region 1 genes from their cellular genome. Thus, such an adenovirus cannot replicate in cells that do not provide the early gene product of the El region. In a preferred embodiment, an adenovirus vector used in the present invention is lacking both the El and the E3 early gene regions. Thus, it is most convenient to introduce the coding sequence for a gene product at the position from which the El and/or E3 coding sequences have been removed (Karlsson et al, EMBO J., 5. 2377-2385, 1986). Preferably, the El region of adenovirus is replaced by the coding DNA sequence or gene. However, the position of insertion within the adenovirus sequences is not critical to the present invention. Techniques for preparing such replication defective adenoviruses are well known in the art as exemplified by Ghosh-Choudhury et al, 1987: McGrory et al, 1988; and Gluzman et al, 1982. A wide variety of adenovirus vectors can be used in the practice of the present invention. An adenovirus vector can be of any of the 42 different known serotypes of subgroups A-F. Adenovirus type 5 of subgroup C is the preferred starting material for production of a replication-defective adenovirus vector. Adenovirus type 5 is a human adenovirus about which a great deal of biochemical and genetic information is known, and it has historically been used for most constructions employing adenovirus as a vector. In order to replicate the virus, the vector is co-transfected into 293 cells together with a plasmid carrying the complete adenovirus type 5 genome. Preferred plasmids may also confer ampicillin and tetracycline resistance due to insertion of the appropriate sequences into the virus genome. The molecular strategy employed to produce recombinant adenovirus is based upon the fact that, due to the packaging limit of adenovirus, the plasmid cannot efficiently form plaques on its own. Therefore, homologous recombination between the desired construct and the co-transfected plasmid within a transfected cell results in a viable virus that can be packaged and form plaques only on 293 cells. Co-transfection is performed in accordance with standard procedures well known in the art. By way of example, 293 cells are cultured in Dulbecco's modified Eagle's medium containing 10% fetal calf serum in a humidified 5% C0 2 atmosphere. Confluent 10 cm dishes are split into three 6 cm dishes. On the following day, the cells are cotransfected in calcium phosphate with HeLa DNA as carrier. Six hours after addition of the DNA to the cells, a 15% glycerol stock is used to boost transfection efficiency and the cells are overlaid with 0.65% Noble agar in DMEM containing 2% FCS, 50 mg/ml penicillin G, 10 mg/ml streptomycin sulfate, and 0.25 mg/ml fungizone (GIBCO, Grand Island, NY). Monolayers are incubated for approximately 10 days until the appearance of viral plaques. These plaques are picked, suspended in DMEM containing 2% FCS, and used to infect a new monolayer of 293 cells. When greater than 90% of the cells show infection, viral lysates are subjected to a freeze/thaw cycle and designated as primary stocks. Recombinant virus with the correct structure is verified by preparation of viral DNA from productively-infected 293 cells, restriction analysis, and Southern blotting. Secondary stocks are subsequently generated by infecting 293 cells with primary virus stock at a multiplicity of infection of 0.01 and incubation until lysis. The particular cell line used to propagate the recombinant adenoviruses of the present invention is not critical to the present invention. Recombinant adenovirus vectors can be propagated on, e.g., human 293 cells, or in other cell lines that are permissive for conditional replication-defective adenovirus infection, e.g., those which express adenovirus El gene products "in trans" so as to complement the defect in a conditional replication-defective vector. Further, the cells can be propagated either on plastic dishes or in suspension culture, in order to obtain virus stocks thereof. When the vector is to be delivered to an animal subject, a preferred method is to percutaneously infuse an adenovirus vector construct into a native or balloon-injured blood vessel that perfuses smooth muscle cells (WO 9411506: Barr et al. Gene Therapy, 1 (1 ):51 - 58, 1994; both incoφorated herein by reference) by intravenous or intra-arterial injection. Methods of delivery of foreign DNA are known in the art. such as containing the DNA in a liposome and infusing the preparation into an artery (LeClerc et al . Circulation 85:543, 1992. incoφorated herein by reference), transthoracic injection (Gal et al . Lab Invest. 68: 18-25. 1993. incoφorated herein by reference). Other methods of delivery may include coating a balloon catheter with polymers impregnated with the foreign DNA and inflating the balloon in the region of arteriosclerosis, thus combining balloon angioplasty and gene therapy (Nabel et al. Cardiovascular Research, 28:445-455, 1994, incoφorated herein by reference). After delivery of an adenovirus vector construct to a smooth muscle cell, that cell is maintained under physiological conditions and for a period of time sufficient for the adenovirus vector construct to infect the cardiac cell and for cellular expression of a coding sequence contained in that construct. Physiological conditions are those necessary for viability of the smooth muscle cell and include conditions of temperature, pH, osmolality and the like. In a preferred embodiment, temperature is from about 20°C to about 50°C, more preferably from about 30°C to about 40°C and, even more preferably about 37°C. pH is preferably from a value of about 6.0 to a value of about 8.0, more preferably from about a value of about 6.8 to a value of about 7.8 and, most preferably about 7.4. Osmolality is preferably from about 200 milliosmols per liter (mosm/L) to about 400 mostn/1 and, more preferably from about 290 mosm/L to about 310 mosm/L. Other physiological conditions needed to sustain smooth muscle cell viability are well known in the art. It should also be pointed out that because the adenovirus vector employed is replication defective, it is not capable of replicating in the cells that are ultimately infected. Moreover, it has been found that the genomic integration frequency of adenovirus is usually fairly low, typically on the order of about 1%. Thus, where continued treatment is required, it may be necessary to reintroduce the virus every 6 months to a year. In these circumstances, it may therefore be necessary to conduct long term therapy, where expression levels are monitored at selected intervals. An adenovirus vector construct is typically delivered in the form of a pharmacological composition that comprises a physiologically acceptable carrier and the adenovirus vector. An effective expression-inducing amount of such a composition is delivered. As used herein, the term "effective expression-inducing amount" means that number of virus vector particles necessary to effectuate expression of a gene product encoded by a coding sequence contained in that vector. Means for determining an effective expression-inducing amount of an adenovirus vector construct are well known in the art. An effective expression-inducing amount is typically from about 10 plaque forming units (pfu) to about 10 ? pfu, preferably from about 10 pfu to about 10 pfu and, more preferably, from about 10 to about 10 " pfu. As is well known in the art, a specific dose level for any particular subject depends upon a variety of factors including the infectivity of the adenovirus vector, the age, body weight, general health, sex. diet, time of administration, route of administration, rate of excretion, and the severity of the particular disease undergoing therapy. In that adenovirus is a virus that infects humans, there may be certain individuals that have developed antibodies to certain adenovirus proteins. In these circumstances, it is possible that such individuals might develop an immunological reaction to the virus. Thus, where an immunological reaction is believed to be a possibility, one may desire to first test the subject to determine the existence of antibodies. Such a test could be performed in a variety of accepted manners, for example, through a simple skin test or through a test of the circulating blood levels of adeno virus-neutralizing antibodies. In fact, under such circumstances, one may desire to introduce a test dose of on the order of 1 x 10 3 to 1 x 10 or so virus particles. Then, if no untoward reaction is seen, the dose may be elevated over a period of time until the desired dosage is reached, such as through the administration of incremental dosages of approximately an order of magnitude. In another aspect, the present invention relates to pharmaceutical compositions that may comprise an adenovirus vector gene construct dispersed in a physiologically acceptable solution or buffer. A composition of the present invention is typically administered parenterally in dosage unit formulations containing standard, well known, nontoxic, physiologically acceptable carriers, adjuvants, and vehicles as desired. The term parenteral as used herein includes intravenous, intramuscular, intraarterial injection, or infusion techniques. Injectable preparations, for example, sterile injectable aqueous or oleaginous suspensions are formulated according to the known art using suitable dispersing or wetting agents and suspending agents. The sterile injectable preparation can also be a sterile injectable solution or suspension in a nontoxic parenterally acceptable diluent or solvent, for example, as a solution in 1,3-butanediol. Among the acceptable vehicles and solvents that may be employed are water, Ringer's solution, and isotonic sodium chloride solution. In addition, sterile, fixed oils are conventionally employed as a solvent or suspending medium. For this puφose any bland fixed oil can be employed including synthetic mono- or di- glycerides. In addition, fatty acids such as oleic acid find use in the preparation of injectables. Preferred carriers include neutral saline solutions buffered with phosphate, lactate. Tris, and the like. Of course, one purifies the vector sufficiently to render it essentially free of undesirable contaminant, such as defective interfering adenovirus particles or endotoxins and other pyrogens such that it will not cause any untoward reactions in the individual receiving the vector construct. A preferred means of purifying the vector involves the use of buoyant density gradients, such as cesium chloride gradient centrifugation. The following examples are included to demonstrate preferred embodiments of the invention. It should be appreciated by those of skill in the art that the techniques disclosed in the examples which follow represent techniques discovered by the inventor to function well in the practice of the invention, and thus can be considered to constitute preferred modes for its practice. However, those of skill in the art should, in light of the present disclosure, appreciate that many changes can be made in the specific embodiments which are disclosed and still obtain a like or similar result without departing from the spirit and scope of the invention. The following techniques and materials were used in the practice of the examples unless otherwise indicated. Isolation of Murine SM22α cDNA Clones The coding region of the murine SM22 cDNA was isolated by performing low stringency PCR™ using murine uterine RNA and synthetic 5' and 3' oligonucleotide PCR™ primers constructed from the previously published sequence of the rat SM22α cDNA (Nishida et al, Gene, 130:297-302, 1993). The 5' PCR™ primer was constructed to be identical to the first 34-bp of the rat SM22α cDNA with the addition of a 5' EcoRI site (5' ATCGAATTCCGCTACTCTCCTTCCAGCCC ACAAACGACCAAGC 3', SEQ ID NO: 10). The 3' primer was constructed to include the reverse complement of bp 759 to 782 of the rat SM22α cDNA with an additional 3' Hindlll restriction site (5' ATCAAGCTTGGTGGGAGCTGCCCATGTGCAGTC 3'. SEQ ID NO: l 1). PCR™ reaction products were subcloned into EcoRI/Hindlll-digested pGEM7Z (Promega. Madison. WI) as described elsewhere (Parmacek and Leiden, ./. Biol. Chem. :264: \ 32\7-\3225, 1989). The nucleotide sequence of the murine SM22α cDNA was confirmed by sequencing of the full- length murine SM22α genomic clone. MacVector DNA sequencing software (Kodak/IBI. Rochester. NY) was used for DNA sequence analyses. To isolate the 3' untranslated region of the SM22α cDNA, 5 x 10 ? recombinant clones from an oligo-(dT) primed λgtl l C2C12 myotube cDNA library were screened with the [ P]-labeled murine SM22α cDNA probe (bp 29-81 1) as described previously (Parmacek et al, Mol. Cell. Biol, 12:1967-1976, 1992). Twelve clones were purified to homogeneity and analyzed by Southern blot analyses as described (Parmacek et al , 1992). Two independent clones, each of which contained a poly (A) tail, were subcloned into pGEM7Z and their nucleotide sequences determined. The nucleotide sequence of the 5' -untranslated region was determined from the sequence of the SM22α genomic clone. The 5' -untranslated region was localized on the genomic clone by Southern blot hybridizations, in addition to RNase protection and primer extension analyses as described below. Isolation of Murine SM22α Genomic Clones Approximately 1 x 10 recombinant phage from a murine 129SV Lambda FIX II genomic library (Stratagene, La Jolla, CA) were screened with the 783-bp murine SM22α cDNA probe (bp 29-811) labeled with [α- 32 P]dCTP, and three positive clones were purified to homogeneity as described previously (Parmacek et al, 1992). One clone (SM22-13a) was found to include the entire coding region of the SM22 gene and 9-kb of 5' flanking sequence and was used for all subsequent subcloning and sequencing studies. Southern Blot Analyses High molecular weight DNA was prepared from the tails of strain 129SV mice as described previously (Parmacek et al . 1989). Southern blotting and hybridization to the radiolabeled 783-bp murine SM22α cDNA probe were performed as described previoush (Parmacek et al, 1989). ). Low stringency washing conditions were 2X SSC, 0.1% SDS at 50°C. High stringency washing conditions were 0.1X SSC, 0.1 % SDS at 68°C. Northern Blot Analyses Tissues were isolated from 12-week old 129SV mice (Jackson Laboratories) as described previously (Parmacek et al, 1989). Animals were housed and cared for according to NIH guidelines in the University of Chicago Laboratory Animal Medicine Veterinary Facility. RNA was prepared from organ samples and from cultures of primary rat aortic SMCs, the rat SMC line A7r5, and non-smooth muscle cell lines including murine NIH 3T3 cells, murine C3H10T1/2 cells, monkey COS-7 cells, murine C2C12 myoblasts and myotubes, human HepG2 cells, and murine EL-4 cells by the single step guanidinium isothiocyanate protocol (Chomczynski, Biotechniques, 15:532-537, 1993). Northern blotting was performed using 10 mg of RNA per sample as described previously with the exception that 36 mg/ml of ethidium bromide was added to the RNA resuspension buffer in order to permit quantitation of the 28S and 18S ribosomal RNA subunits in each lane. Probes included the 783-bp (bp 29-811) murine SM22α cDNA and the 754-bp (bp 659-1404) murine calponin cDNA probe. Quantitative image analyses were performed using a Molecular Dynamics Phosphorlmager (Sunnyvale, CA). Primer Extension, 5' RACE, and RNase Protection Analyses A 25-mer oligonucleotide probe constructed to include the reverse complement of base pairs +80 to +104 of the SM22α gene (5' TGCCGTAGGATGGACCCTTGTTGGC 3', SEQ ID NO: 12) was 5' end labeled with [γ- 32 P]ATP and T4 polynucleotide kinase. 40 mg of mouse uterine RNA was hybridized to 2 x 10 DPM of labeled probe and primer extension reactions performed at 42°C, 50°C and 56°C as described previously (Parmacek et al, 1992). 5' RACE was performed using murine uterine RNA and a synthetic antisense cDNA probe corresponding to bp 234 to 258 of the murine SM22α cDNA according to the manufacturer's instructions (Perkin Elmer, Norwalk, CT). RNase protection analyses were performed by subcloning the -441 to +41 murine SM22α genomic subfragment including a synthetic 3' Hindlll linker into Pstl/Hindlll-digested pGEM4Z and performing in vitro transcription of the antisense strand of the genomic subfragment with T7 polymerase of the Nco/-linearized plasmid (Ncol cuts at bp -88 of the genomic clone) in order to obtain an antisense cRNA probe corresponding to bp -88 to +44. The Hindlll linker shares sequence identity with the SM22α cDNA resulting in a cRNA probe with sequence identity initiated at bp +44 (not +41) of the SM22α genomic clone. The 142-bp probe was labeled with [α- j2 P]UTP and RNase Protection Analyses were performed using the RPAII™ kit (Ambion, Austin, TX) according to the manufacturer's instructions. Antisense cRNA probe radiolabeled by incoφoration of α-[ P]-UTP is synthesized by in vitro transcription from linearized pBluescriptIIKST7-/ cZ, which contains the lacZ gene upstream of the T7 RNA polymerase promoter, using the MaxiScript™ kit (Ambion, Austin, TX). Band intensity is quantified by Phosphorlmager™, as previously for southern analyses described above. Cell Culture The rat cell line A7r5 which was derived from embryonic thoracic aorta was grown in Dulbecco's Modified Essential Media (GIBCO) supplemented with 10% fetal bovine serum (GIBCO) and 1 % penicillin/streptomycin. The human hepatocellular carcinoma cell line Hep G2 was grown in Modified Eagle's Medium supplemented with 10% fetal bovine serum and 0.1 mM MEM non-essential amino acids (GIBCO). Murine lymphoma-derived EL4 cells were grown in Dulbecco's modified Eagle's Media supplemented with 10% horse serum (GIBCO). Murine NIH 3T3 cells, C3H10T1/2 cells, C2C12 myoblasts and myotubes were grown as described previously (Parmacek et al, J. Biol. Chem., 265:15970-15976, 1990; Parmacek et al, Mol. Cell. Biol, 14:1870-1885, 1994). Primary cultures of rat aortic SMCs were isolated from 12-16 week old Sprague Dawley rats (Charles River Laboratories, Wilmington, MA) using the method described previously (Chang et al, Science, 1995a). Virtually all cells isolated using this method stain positive with anti-smooth muscle actin monoclonal antiserum. In all studies, only early passage (passage 2 or 3) rat aortic SMCs were utilized. For the cell cycle analyses, SMCs from the third passage were placed in serum-free medium (50% Dulbecco's minimal essential medium (DMEM), 50% Ham's F-12, L-glutamine (292 mg/ml), insulin (5 mg/ml), transferrin (5 mg/ml), selenious acid (5 ng/ml)) for 72 hrs in order to synchronize the cells in G 0 /G] as described previously (Chang et al , 1995a). Following 72 hrs of serum starvation, cells were stimulated to proliferate by incubation in medium containing 45% DMEM, 45%> Ham's F-12 and 10% FBS. Mouse WEHI B-cells and mouse 70Z/3 pre-B lymphocytes were grown as described previously (Morrisey et al . Dev. Biol, 177:309-322, 1996). DNase I footprinting Nuclear extracts were prepared from the smooth muscle cell line, A7r5 (which express high levels of SM22α mRNA (Solway et al. 1995)) and NIH 3T3 cells as described previously (Parmacek et al. 1992). Three overlapping genomic subfragments (bp -441 to - 256, bp -256 to -89, and bp -89 to +41) spanning the 482-bp SM22α promoter were analyzed. DNase I footprint analyses were performed with 100-150 mg of nuclear extracts prepared from the smooth muscle cell line, A7r5, or NIH 3T3 fibroblasts and the end-labeled sense and antisense strands of the murine SM22α promoter as described previously (Parmacek et al.. 1994). Standard Maxam and Gilbert (G + A) sequencing reactions were run in parallel to identify the protected sequences. Electrophoretic mobility shift assays (EMSAs) Nuclear extracts were prepared from low passage number primary rat aortic SMCs. A7r5 cells, NIH 3T3 cells, C3H10T1/2 cells, C2C12 myotubes, WEHI, 70Z/3 and EL4 cells as described by Dignam et al. Nucleic Acids Res. 1 1 : 1475, (1983). EMSAs were performed in 0.25X TBE (IX TBE is 100 mM Tris, 100 mM boric acid and 2 mM EDTA) as described previously (Ip et al. Mol. Cell. Biol, 14:7517-7526, 1994). The following complementary oligonucleotides (corresponding to each nuclear protein binding site identified by DNasel footprint analysis or nuclear protein binding sites containing the specific mutations indicated (mutated nucleotides are underlined)) were synthesized with BamHI and Bglll overhanging ends: SME-1-5' AAGGAAGGGT TTCAGGGTCC TGCCCATAAA AGGTTTTTCC CGGCCGC 3'(SEQIDNO:21); μSME-1- 5'AAGGAAGGGT TTCAGGGTCC TGCCCATAGA TCTTTTTTCC CGGCCGC 3'(SEQIDNO:22); SME-2- 5' CCGCCCTCAG CACCGCCCCG CCCCGAGGCC CGCAGCATGT CCG 3' (SEQIDN0.23); μSME-2- 5' CCGCCCTCAG CACCGCGGAT CCCCGACCCC CGCAGCATCT CCG 3' (SEQIDNO:24); SME-3- 5' CTCCAAAGCA TGCAGAGAAT GTCTCCGGCT GCCCCCG 3' (SEQ ID NO:25); μSME-3- 5' CTCGGATCCA TGCTAGCAAT GAATTCGGCT GCCCCCG 3' (SEQ ID NO:26); SME-4- 5' TCCAACTTGG TGTCTTTCCC CAAATATGGA GCCTGTGTGG AGTG 3' (SEQ ID NO:27); μSME-4- 5' TCCAACTTGG TGTCTTTCCC CAAGGATCCA GCCTGTGTGG AGTG 3'(SEQ ID NO:28); μSRF/SME-4- 5' TCCAACTTGG TGTCTTTCCC CGGATATGGA GCCTGTGTGG AGTG 3'(SEQ ID NO:29); μYYl /SME-4- 5' TCCAACTTGG TGTCTTTCCC CAAATTAGGA GCCTGTGTGG AGTG 3' (SEQ ID NO:30); SME-5- 5' GGGCAGGGAG GGGCGCCAGC G 3' (SEQ IDNO.31); μSME-5- 5' GGGCAGGTAC CGAATTCAGC G 3' (SEQ ID NO:32); SME-6- 5' GGACGGCAGA GGGGTGACAT CACTGCCTAG GCGGCCG 3' (SEQ ID NO:33); μCREB/SME-6- 5' GGACGGCAGA GGGGATCCAT GCCTGCCTAG GCGGCCG 3' (SEQ ID NO:34); μYYl/SME-6- 5' GGACGGCAGA GGGGATCCAT CACTGCCTAG GCGGCCG 3' (SEQ ID NO:35); Spl- 5' CTGGCTAAAG GGGCGGGGCT TGGCCAGCC 3' (SEQ ID NO:36); CREB/TCR - 5' CTCCCATTTC CATGACGTCA TGGTTA 3' (SEQ ID NO:37). For cold competition studies, 5 to 100 ng of unlabeled competitor oligonucleotide was included in the binding reaction mixture. For antibody supershift studies, 1 μl of either rabbit preimmune, affinity purified rabbit or mouse IgG (Santa Cruz), α-SRF rabbit polyclonal antiserum (Santa Cruz. sc-335X), α-Spl rabbit polyclonal IgG (Santa Cruz, sc-059X), α-YYl rabbit polyclonal IgG (Santa Cruz, sc-281X), α-CREB-1 mouse monoclonal IgG2 (Santa Cruz, sc-271), α-ATF-1 mouse monoclonal IgA (Santa Cruz, sc-243), α-AP2 rabbit polyclonal IgG (Santa Cruz, sc-184X), or α-GATA-4 rabbit polyclonal IgG (Ip et al. 1994) was incubated with the indicated nuclear extract at 4°C for 20 minutes prior to the binding reaction as described previously (Ip et al, 1994). Plasmids To assess the function of each of the six nuclear protein binding sites identified within the SM22α promoter, a series of SM22α mutant promoter-luciferase reporter plasmids were generated by PCR™-mediated site directed mutagenesis as described previously (Morrisey et al, 1996). The rous sarcoma virus (RSV) LTR-driven luciferase reporter plasmid, pRSVL, and the pMSVβgal reference plasmid have been described previously (Parmacek et al. , 1992). The promoterless pGL2-Basic plasmid (Promega, Madison, WI) served as the cloning backbone for all of the luciferase reporter plasmids described herein. The p-5000/H SM221uc plasmid, contains 5-kb of SM22α 5' flanking sequence, the untranslated SM22α first exon. the SM22α first intron and the first 12-bp of exon 2 of the SM22α gene subcloned 5' of the luciferase reporter gene. It was constructed by first subcloning the 8.5 kb BamHIIHindlll SM22α genomic subfragment (containing 5-kb of 5' flanking sequence, exon 1 and 3.5-kb of intron 1) into BgUIIHindlll digested pGL2-Basic vector. Next, a 488-bp PCR™-generated Hindlll- linkered SM22α genomic subfragment, including at its 5' end the SM22α intron 1 Hindlll restriction site, and running to bp +76 of the SM22 cDNA (which includes 12-bp of exon 2) was subcloned into the Hindlll-digested vector and its correct orientation (5' to 3' relative to the luciferase reporter gene) confirmed by DNA sequence analysis. The p-5000SM221uc plasmid, containing 5-kb of SM22α 5' flanking sequence subcloned 5' of the luciferase reporter gene, was constructed by first subcloning the 2.2-kb BamHIIEcoRI SM22α genomic subfragment (corresponding to bp -5000 to -2800) into BamHI/EcoRI-άigested pBluescriptllKS (Stratagene La Jolla, CA). Next, the 1250-bp EcoRIINcoI SM22α genomic subfragment corresponding to bp -1338 to -89 and the 130-bp PCR™-generated genomic subfragment containing bp -88 (including the Ncol site at its 5' end) to +41 (including a Hindlll linker at its 3' end) was ligated into the EcoRII Hindlll-dig sXcd vector. Then, the 1.4-kb EcoRI SM22α genomic subfragment (corresponding to bp -2800 to -1339) was subcloned into the plasmid and its orientation confirmed by DNA sequence analysis. Finally, the resulting SM22α genomic subfragment corresponding to bp -5 kb to +41 was excised from the Bluescript phagemid with BamHI and Hindlll and subcloned into Bglll/Hindlll-digestQd pGL2-Basic. The p- 1338SM221uc plasmid containing the 1379-bp SM22α genomic subfragment (bp -1338 to +41 ) subcloned 5' of the luciferase reporter in the pGL2-Basic vector, was constructed using the 1250-bp EcoRI/NcoI SM22α genomic subfragment (bp -1338 to -89) and the 130-bp (bp -88 to +41) PCR™ -generated genomic subfragments described herein. The p-441SM221uc plasmid contains the 482-bp (bp -441 to +41) Pstli Hindlll SM22α genomic subfragment subcloned into Bglll/Hindlll-digested pGL2-Basic plasmid. The p-300SM221uc and p-162SM221uc luciferase reporter plasmids, respectively, contain the PCR™-generated bp -300 to +41, and -162 to +41 SM22α genomic subfragments (including synthetic Xhol (5' end) and Hindlll (3' end) linkers), subcloned into XhoI/HindW-digested pGL2-Basic vector. All PCR™-generated genomic subfragments were confirmed by dideoxy DNA sequence analysis. The following SM22α mutant promoter-luciferase reporter plasmids were generated and named according to the specific nuclear protein binding site (or sites) within the promoter that was mutated (mutated nucleotides within each nuclear protein binding site are underlined): p-441 SM22μSME-l 5' AAGGAAGGGT TTCAGGGTCC TGCCCATAGA TCTTTTTTCC CGGCCGC 3' (SEQ ID NO:38); p-441SM22μSME-25' CCGCCCTCAG CACCGCGGAT CCCCGACCCC CGCAGCATCT CCG3'(SEQIDNO:39); p-441SM22μSME-3 5' CTCGGATCCA TGCTAGCAAT GAATTCGGCT GCCCCCG 3' (SEQ ID NO.40); p-441SM22μSME-4 5' TCCAACTTGG TGTCTTTCCC CAAGGATCCA GCCTGTGTGG AGTG 3' (SEQ ID NO:41 ); p-441SM22μSRF/SME-4 5' TCCAACTTGG TGTCTTTCCC CGGATATGGA GCCTGTGTGG AGTG 3' (SEQ ID NO:42); p-441SM22μYYl /SME-4 5' TCCAACTTGG TGTCTTTCCC CAAATTAGGA GCCTGTGTGG AGTG 3' (SEQ ID NO:43); p-441 SM22μSME-5 5' GGGCAGGTAC CGAATTCAGC G 3' (SEQ ID NO:44); p-441 SM22μCREB/SME-6 5' GGACGGCAGA GGGGATCCAT GCCTGCCTAG GCGGCCG 3' (SEQ ID NO:45); p-441 SM22μYYl /SME-6 5' GGACGGCAGA GGGGATCCAT CACTGCCTAG GCGGCCG 3' (SEQ ID NO:46). In addition, several SM22α promoter-luciferase reporter plasmids were subcloned that contain mutations in two s-acting sequences in the SM22α promoter sequence, p- 441SM22μCArG contains the mutations described above in the SME-1 and SME-4 sites, and p-441 SM22μSME2/5 contains the mutations described above in the SME-2 and SME-5 sites. Each PCR™-generated SM22α promoter mutant was confirmed by DNA sequence analyses as described previously (Parmacek et al, 1992). To identify functionally important c ' s-acting elements that control the expression of the SM22α gene in vivo, four transgenic vectors were cloned each of which encodes the bacterial lacZ reporter gene under the transcriptional control of the native or mutated SM22α promoter fragments. The p-5000SM22-/αcZ, p-441 SM22-/αcZ plasmid, the p- 441SM22μCArG-/αcZ, and p-280SM22-/αcZ plasmids, contain the 5-kb SM22α promoter, the 441-bp SM22α promoter, the 441-bp SM22α promoter with mutations in SME-1 and SME-4 (that abolish binding of SRF), and the 280-bp SM22α promoter, respectively. subcloned immediately 5' of the bacterial lacZ reporter gene in a modified pBluescript IIKS (Stratagene) plasmid. Transfections and Luciferase assays 1 x 10 6 passage three primary rat aortic SMCs, C2C12 myotubes and A7r5 cells, respectively, were split and plated 24 hours prior to transfection and transfected with either 50 or 100 μg of Lipofectin reagent (Life Technologies, Gaithersburg, MD), 15 μg of luciferase reporter plasmid and 5 μg of the pMSVβgal reference plasmid as described previously (Parmacek et al, 1992; Ip et al . 1994; Solway et al , 1995. 1 x 10 6 NIH 3T3 or COS-7 were transfected with 20 μg of Lipofectin reagent, 15 μg of the luciferase reporter plasmid and 5 μg of the pMSVβgal reference plasmid as described previously (Ip et al, 1994; Forrester et al. . Am. Coll. Cardiol . 17:758-769, 1991). 1 x 10 6 Hep G2 cells were transfected using 360 μg of Lipofectamine reagent (Life Technologies, Gaithersburg, MD), 26 μg of luciferase reporter plasmid and 9 μg of the pMSVβgal reference plasmid. Following transfection, cell lysates were prepared, normalized for protein content and luciferase and β-galactosidase assays were performed as described previously (Parmacek et al, 1992). All studies were repeated at least three times to assure reproducibility and permit the calculation of standard errors. Luciferase activities (light units) were corrected for variations in transfection efficiencies as determined by assaying cell extracts for β-galactosidase activities. Data are expressed as normalized light units + S.E.M. Transgenic mice Transgenic mice were produced harboring the p-5000SM22-/αcZ, p-441 SM22-/αcZ. p-441 SM22μCArG-/αcZ and p-280SM22-/αcZ transgenes according to standard techniques as described previously (Metzger et al, Proc. Natl. Acad. USA, 90:9036, 1993). To identify transgenic founder mice, Southern blot analysis was performed using the radiolabeled lacZ probe and high molecular weight DNA prepared from tail biopsies of each potential founder. The number of copies per cell were quantitated by comparing the hybridization signal intensity (DPM) to standards corresponding to 1, 10 and 100 copies/cell using a Molecular Dynamics Phosphorlmager™. At least four independent founder lines containing each transgene were identified as described previously (Parmacek and Leiden, 1989). Transgenic embryos (less than ED 15.5) and tissue sections from adult mice were fixed, stained for β- galactosidase activity and counter-stained with hematoxylin and eosin as described previousl} (Lin et al, Circulation, 82:2217-2221, 1990), except that 0.02% NP-40 was added to PBS during the fixation of whole mount embryos. In addition, to visualize the arterial system of mouse embryos, following staining for β-galactosidase activity, embryos were dehydrated in methanol for 24 h and cleared in 2: 1 (V/V) benzyl benzoate:benzyl alcohol for 2 h. Example 1 Isolation and Structural Characterization of the Murine SM22α cDNA Murine SM22α cDNA clones were isolated using the polymerase chain reaction in conjunction with synthetic oligonucleotide primers derived from the previously published sequence of the rat SM22α cDNA (Nishida et al, 1993). The nucleotide sequence of the full- length murine SM22α cDNA is designated herein as SEQ ID NO:8. The murine SM22α cDNA encodes a 201-amino acid polypeptide, SEQ ID NO:9, with a predicted molecular mass of 22.5 kDa. It is composed of a 76-bp 5' untranslated region, a 603-bp open reading frame, and a 403-bp 3' untranslated region. Twenty three base pairs 5' of the poly(A) tail there is an A/T rich sequence (AATATA) which may function as the polyadenylation signal. A comparison of the coding sequences of the murine and human SM22α cDNAs (Shanahan et al, 1993) demonstrated that the two sequences are 91% and 97% identical at the nucleotide and amino acid levels, respectively. In addition, a comparison of the coding sequences of the murine SM22α cDNA and the murine smooth muscle thin filament regulatory protein, calponin (Strasser et al. , Genbank Direct Submission Accession Number Z19542, 1992), demonstrated that these two sequences are 23% identical and 32% conserved at the amino acid level. Interestingly, the protein sequence encoded by the murine SM22α cDNA exhibits partial sequence identity with the sequence of the Drosophila muscle protein mp20 (Lees-Miller et al, J. Biol. Chem., 262:2988-2993. 1987) across the entire cDNA. suggesting that these two proteins may have evolved from a common ancestral gene. Two domains were particularly well conserved between these proteins. One domain with 14/19 amino acid identity (corresponding to amino acids 104-122 of the murine SM22α protein) may represent a calcium binding domain oriented in an EF hand conformation (Kretsinger. CRC Crit. Rev. Biochem., 8: 1 19-174, 1980). The second C-terminal conserved domain with 13/24 amino acid identity (corresponding to amino acids 158-181 of the murine SM22α protein) is a domain of unknown function. SM22α Is Encoded by a Single Copy Gene The finding of a putative calcium binding domain oriented in an EF hand conformation suggested that SM22α might be related to other members of the troponin C supergene family of intracellular calcium binding proteins including slow/cardiac troponin C, fast skeletal troponin C, calmodulin, myosin light chain and parvalbumin (Kretsinger. 1980). In order to determine whether SM22α is encoded by a single copy gene in the murine genome and whether SM22α is related to other troponin C supergene family members, the murine SM22α cDNA was used to probe Southern blots containing murine genomic DNA under both high and low stringency conditions. Under high stringency conditions, the murine SM22α cDNA probe hybridized to one or two BamHI, EcoRI, Hindlll, Pstl and Xbal bands, suggesting that SM22α is a single copy gene in the murine genome. Interestingly, no additional bands were demonstrated under low stringency conditions, suggesting that although the SM22α gene may have one EF hand calcium binding domain, it is not closely related to other members of troponin C supergene family. Example 2 Expression of the SM22α Gene Previous studies have suggested that SM22α protein is expressed solely in smooth muscle-containing tissues of the adult and may be one of the earliest markers of the smooth muscle cell lineage (Gimona et al, Eur. J. Biochem., 205:1067-1075. 1992; Duband et al. Differentiation, 55 (1):1-1 1, 1993; Nishida et al, 1993). To determine the in vivo pattern of SM22α gene expression, the SM22α cDNA was hybridized to Northern blots containing RNAs prepared from 12-week old murine tissues. The murine SM22α cDNA probe hybridized to one predominant mRNA species of approximately 1.2-kb. SM22α mRNA is expressed at high levels in the smooth muscle-containing tissues of aorta, small intestine, lung, spleen and uterus. In addition, prolonged autoradiographic exposures revealed very low. but detectable, levels of SM22α mRNA in heart, kidney, skeletal muscle and thymus. In order to determine the cell-specificity of SM22α gene expression, the SM22α cDNA probe was hybridized to northern blots containing RNAs prepared from rat aortic vascular SMCs, the rat SMC line A7r5, murine NIH 3T3 and C3H10T1/2 fibroblasts, the SV40-transformed monkey kidney cell line COS-7, murine C2C12 myoblasts and myotubes, the human hepatocellular carcinoma cell line Hep G2 and the murine lymphoid cell line EL4. High levels of SM22α mRNA were detected in primary rat aortic vascular SMCs and the smooth muscle cell line A7r5. Detection of a second 1.5 kb species of mRNA represents cross hybridization of the SM22α probe to the murine calponin mRNA. In addition, SM22α mRNA was expressed in both undifferentiated C2C12 myoblasts and terminally- differentiated C2C12 myotubes. Finally, a faint hybridization signal was detectable in NIH 3T3, C3H10T1/2, and Hep G2 cells after a 3-day autoradiographic exposure. Quantitative Phosphorlmager™ analysis of these low level hybridization signals revealed that SM22α mRNA is expressed in these three non-myogenic cell lines at less than 1.5% the intensity of SM22α gene expression in A7r5 and primary SMCs. Thus, in addition to primary SMCs and SMC lines, SM22α mRNA is expressed in other embryonic skeletal muscle cell lineages such as C2C12 myoblasts and myotubes, but not in other non-myogenic cell lineages. SM22α Is Expressed in Both Cell Cycle Arrested and Proliferating SMCs Within the tunica media of the arterial wall the vast majority of vascular SMCs are maintained in a non-proliferating, quiescent state and express contractile proteins (Owens et al, 1986; Rovner et al, 1986; Taubman et al, 1987; Ueki et al, 1987; Gimona et al, 1990; Shanahan et al, 1993; Ross, Nature, 362:801, 1993; Forrester et al, 1991). However, in response to vascular injury, SMCs migrate from the tunica media to the intimal layer, proliferate and assume a "synthetic phenotype" (Ross, 1986; Schwartz et al, 1986; Zanellato et al, 1990; Ross, 1993; Forrester et al, 1991 ; Schwartz et al, 1992; Liu et al, 1989). Previous studies have demonstrated that many genes encoding vascular SMC contractile proteins are down-regulated during this process (Owens et al, 1986; Rovner et al, 1986; Ueki et al, 1987; Gabbiani et al, Proc. Natl. Acad. Sci. USA 78:298, 1981). Thus, the SM22α gene may be unique in that its expression is not differentially regulated during progression through the cell cycle. In order to address this question, cultures of low passage number primary rat aortic SMCs were synchronized in the G 0 /G, stage of the cell cycle by serum starvation for 72 hrs. FACS analyses revealed that under these conditions approximately 90% of cells are arrested in G 0 /G, (Chang et al, 1995a). The cells were then serum-stimulated and RNA was prepared from replicate cultures at the time of serum stimulation (t 0 ), and at 8 hrs, 12 hrs, 16 hrs, and 24 hrs post-stimulation. After serum stimulation, the arrested vascular SMCs begin to pass through the G,/S checkpoint of the cell cycle at approximately 12 hrs and by 24 hrs post-stimulation greater than 50% of cells are in the S and G 2 /M phases of the cell cycle (Chang et al, 1995a). A northern blot analysis demonstrated no differences in SM22α gene expression in cell cycle arrested versus proliferating SMCs as assessed by quantitative Phosphorolmager™ analysis of the hybridization signal. Thus, in contrast to other smooth muscle contractile proteins, such as smooth muscle myosin heavy chain (Rovner et al , 1986), smooth muscle α-actin (Owens et al, 1986) and calponin, SM22α appears to be constitutively expressed at high levels in both quiescent and proliferating vascular SMCs. Example 3 Isolation and Structural Characterization of a SM22α Genomic Clone A full length murine SM22α genomic clone of 20-kb was isolated by screening a murine 129SV genomic library with a SM22α cDNA probe under high stringency conditions. Exons were identified by hybridization with specific cDNA fragments and their boundaries confirmed by DNA sequence analysis. The nucleic acid sequence of the genomic clone is designated herein as SEQ ID NO:l , containing exon 1, SEQ ID NO:2. containing exons 2, 3 and 4, and SEQ ID NO: 6, containing exon 5. There is approximately a 4 kb gap between SEQ ID NO:l and SEQ ID NO:2, and approximately a 450 base gap between SEQ ID NO:2 and SEQ ID NO:6. The amino acid sequences are encoded by exons 2, 3 and 4 and are designated herein as SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:5 and SEQ ID NO:7. The murine SM22α gene is composed of five exons spanning 6.2-kb of genomic DNA. The transcriptional start site of the SM22α gene was identified by RNase protection. primer extension and 5' RACE PCR™ analyses. Primer extension analyses utilizing an antisense synthetic oligonucleotide corresponding to bp 80-104 of the SM22α cDNA resulted in a major extended product of 104-bp (arrow) which was generated at reaction temperatures up to 56°C In addition, 5' RACE PCR™ was performed utilizing an antisense oligonucleotide primer corresponding to bp 234-258 of the SM22α cDNA DNA sequence analyses of eight random 5' RACE clones revealed a transcriptional start site 76-bp 5' of the initiation codon in seven of eight clones and 72-bp 5' of the initiation codon in one of eight clones RNase protection analyses were also performed using an antisense cDNA probe corresponding to bp -88 - +44 of the SM22α genomic sequence as deduced by DNA sequence and Southern blot analyses These analyses revealed a major protected fragment of 44-bp (arrow) corresponding to a transcriptional start site 76-bp 5' of the initiation codon In addition, a second, minor (20% relative signal intensity) protected fragment of 54-bp was also demonstrated Taken together, these data allowed the identification of the major transcriptional start site of the murine SM22α gene 76-bp 5' of the initiation codon The complete coding sequence and 1339-bp of 5' flanking sequence of the SM22α gene was determined and each of the splice junctions conforms to the consensus splice donor- acceptor patterns as described by Breathnach and Chambon (Breathnach et al , Annu Rev Biochem, 50, 349-383, 1981) In order to identify potential transcriptional regulatory elements, 1339-bp of 5' sequence flanking the cap site was searched foi a variety of transcriptional regulatory elements using MacVector DNA sequencing software (Kodak/IBI) The nucleotide sequence TTTAAA, which might function as a TATA box was present 29-bp 5' of the start site A consensus CAAT box was not identified in the immediate 5' flanking region of the SM22α gene A computer homology search for previously described muscle- specific and/or skeletal or cardiac muscle lineage-restricted transcriptional regulatory elements revealed five consensus E boxes/bHLH myogemc transcription factor binding sites (CANNTG [Olson, Genes Dev , 4, 1454-1461 , 1990, Tapscott et al , J Clin Invest , 87 1133- 1138, 1991 , Lassar et al , Cell, 58 (5) 823-31, 1989]) located at bps -534, -577, -865, -898, - 910, and -1267, three consensus GATA-4 binding sites (WGATAR [Evans et al , Proc Natl Acad Sci (USA), 85 5976-5980, 1988]) located at bps -504, -828, -976, and two AT-πch, potential MEF-2/rSRF binding sites (YTAWAAATAR, SEQ ID NO 13 [Gossett et al , Mol Cell Biol 9 5022-5033, 1989]) located at bps -407 (TTtAAAATcG, SEQ ID NO 14, small letters denote mismatches from the consensus MEF-2 sequence) and -770 (TTcAAAATAG, SEQ ID NO 15) In addition, functionally important nuclear protein binding sites which have been identified in previously characterized skeletal and cardiac-specific transcriptional regulatory elements included two consensus CArG/SRF binding sites (Minty et al, Mol. Cell. Biol. 6:2125, 1986) located at bps -150 and -273 and one CACC box (Dierks et al, Cell, 32:695-706, 1983) located at bp -104. Finally, four AP2 (CCCMNSSS, SEQ ID NO: 16 [Mitchell et al. Cell, 50:847-851, 1987]), one Spl (KRGGCKRRK, SEQ ID NO: 17 [Dynan et al, Cell, 35:79-87, 1983]), and two NF-IL6 (TKNNGNAAK, SEQ ID NO: 18 [Akira et al, EMBO J, 9 (6): 1897-906, Cell, 35:79-87, 1990]) binding sites were located in the 5' flanking region. Example 4 Identification of the cis-Ac ng Transcriptional Regulatory Elements That Control SM22α Gene Expression In order to identify the functionally important cis-ac ng sequences that regulate transcription of the SM22α gene in SMCs, a series of transient transfections were performed using SM22α-luciferase reporter constructs and primary rat aortic vascular SMCs and the SMC line, A7r5, both of which express high levels of SM22α mRNA. Transfection of A7r5 cells with the plasmid p-5000/H SM221uc, containing 5-kb of 5' flanking sequence and the entire 4-kb SM22α intron 1 sequence (the initiation codon is located in exon 2). resulted in a 250-300-fold induction in luciferase activity as compared to the promoterless control plasmid, pGL2-Basic. This level of transcriptional activity was comparable to that obtained following transfection of A7r5 cells with the RSV-containing luciferase reporter plasmid, pRSVL. In order to determine whether this transcriptional activity was due to the immediate 5' flanking region of the SM22α gene, or alternatively, was due to a transcriptional regulatory element located within the first intron of the SM22α gene, the activities of the p-5000/HSM221uc and p-5000SM221uc plasmid were compared. Transfection of A7r5 cells with the p- 5000SM221uc plasmid, containing only 5-kb of 5' flanking sequence, resulted in high-level transcription of the luciferase reporter gene comparable (on a molar basis) to levels obtained with the p-5000/H SM221uc plasmid. Thus, the 5' flanking region of the SM22α gene contains c; ' .s-acting sequence elements required for high-level transcription in A7r5 cells. To further localize the 5' flanking elements of the SM22α gene that direct high-level expression in SMCs, a series of 5' deletion mutants were transfected into both A7r5 cells and primary cultured rat aortic vascular smooth muscle cells. In both A7r5 cells and primary vascular SMCs, the p-441SM221uc plasmid, containing 441-bp of 5' flanking sequence, increased transcription of the luciferase reporter to levels comparable to the p-5000SM221uc plasmid and the p-1338SM221uc plasmids. However, transfection of both A7r5 cells and primary vascular SMCs with the luciferase reporter plasmids p-300SM221uc and p- 162SM221uc containing 300-bp and 162-bp, respectively, of 5' flanking sequence resulted in 50% and 90% reductions in normalized luciferase activities as compared with those obtained with the p-441SM221uc. These data demonstrated that 441-bp of SM22α 5' flanking sequence, containing the endogenous SM22α promoter, is sufficient to direct high-level transcriptional activity in both A7r5 cells and primary rat aortic SMCs. Example 5 Cellular-Specificity of the SM22α Promoter In order to characterize the cellular-specificity of the SM22α promoter sequence, the transcriptional activities of the 441-bp SM22α promoter containing plasmid, p-441SM221uc, was compared to the positive control plasmid containing the rous sarcoma virus LTR, pRSVL, in primary rat vascular SMCs, the smooth muscle cell line A7r5. NIH 3T3 fibroblasts, COS-7, and Hep G2 cells. Consistent with the lineage-restricted pattern of SM22α mRNA expression demonstrated in these cell lines, the promoter-containing plasmid, p-441SM221uc, was active in primary rat aortic SMCs and A7r5 cells, increasing transcription of the luciferase reporter gene approximately 2500-fold and 540-fold, respectively, over that induced by transfection with the promoterless pGL2-Basic plasmid (FIG. 1). This level of promoter activity was comparable to levels obtained following transfection of these cells with the RSV LTR-driven positive control plasmid (FIG. 1). In contrast, the 441 -bp SM22α promoter was inactive in NIH 3T3, COS-7 and Hep G2 cells (FIG. 1). DNA sequence analyses revealed that this 441 -bp promoter contains two CArG/SRF boxes (Minty et al. , 1986), a CACC box (Dierks et al, 1983), and one A/T-rich, potential MEF-2/rSRF binding site (Gossett et al, 1989), c ' .v-acting elements which have each been demonstrated to be involved in the transcriptional programs that regulate skeletal and cardiac muscle-specific gene expression. However, unlike most previously described skeletal muscle-specific transcriptional regulatory elements, this sequence lacked a canonical E box binding site for the myogenic bHLH transcription factors (Tapscott et al, 1991 ; Lassar et al, 1989). Thus, the endogenous 441-bp SM22α promoter contains all of the cis-actmg sequence elements required to recapitulate the smooth muscle lineage-restricted pattern of SM22α gene expression demonstrated in vivo. Example 6 Generation of SM22α-βgal Transgenic Mice A reporter construct was first prepared in which the 441-bp minimal SM22α promoter was subcloned immediately 5' of the bacterial β-galactosidase reporter gene (lαcZ). The transgenic vector was generated from a pBluescript-KS phagemid containing Ascl restriction sites flanking the polylinker sequence. This construct is referred to herein as -44\SM22lαcZ. The transgene was microinjectedinto oocytes that were transplanted into pseudo-pregnant hosts as described in Metzger et αl, 1993 (incoφorated herein by reference). To identify transgenic founder mice, Southern blot analysis was performed using the radiolabeled lαcZ probe and high molecular weight DNA prepared from tail snips of each potential founder pup. The radiolabeled lαcZ cDNA probe hybridized to the expected 4.2 kb ifømHT-digested band in 4 of 17 pups analyzed. The four founders contained between 5 and 160 copies per cell as assessed by comparing the hybridization signal intensity (DPM) to standards corresponding to 1 , 10 and 100 copies per cell using a Molecular Dynamics Phosphorlmager™. The FI -44l SM22lαcZ #14 male was crossed with a CD-I female and El 1.5 embryos from this litter were isolated, genotyped (using PCR™). fixed and stained for β-galactosidase activity. Transgenic embryos were easily distinguished from their non-transgenic litter mates by the obvious blue staining along their distal somites. This pattern correlated with the transient pattern of SM22α gene expression observed in the developing somites. In EDI 1.5 embryos, the endogenous SM22α gene is expressed throughout the primitive heart tube, developing somites, dorsal aorta and the forming branch arteries (Li et al. 1996a). Whole mount staining of EDI 1.5 embryos demonstrated high level β-galactosidase activity throughout the developing arterial system. Blue staining was observed throughout the dorsal aorta, the carotid and vertebral arteries, the cerebral arteries, the umbilical arteries and the aortic arches. A high power section through the iliac artery, demonstrated that expression of the lacZ transgene was restricted to 1-2 layers of cells underlying the arterial endothelium. In addition, β-galactosidase activity was detected within the myotomal component of the developing somites and within the bulbo-truncus region (future outflow tract) and at low levels within the bulbo-cordis region (future right ventricle) of the primitive heart, β-galactosidase activity was not detected within the future left ventricle, left atrium or right atrium at this stage of embryonic development. Suφrisingly, although the SM22α gene is expressed at high levels in smooth muscle cells lining the pulmonary airways, as well as within the gastrointestinal and genitourinary tracts, no β-galactosidase activity was detected in the developing lung buds, gastrointestinal mucosa, or the uterine or bladder mucosa during late murine embryogenesis or postnatal development. Thus, the 441 bp SM22α promoter is necessary and sufficient to activate transcription in vascular SMCs in a lineage-restricted fashion in transgenic mice. In addition, this minimal promoter element contains c«-acting sequences required to activate transcription of the SM22α gene in the developing somites. These data also demonstrate that SM22α gene expression is regulated at the level of transcription. Furthermore, the normalized luciferase activity obtained with the 300-bp promoter was still 100-fold above that obtained with promoterless control plasmids in these transient transfection assays. To determine whether a 280-bp SM22α promoter fragment (bp -280 - +41) was sufficient to direct arterial SMC-specific gene expression, the inventors produced eight independent lines of transgenic mice in which the lacZ gene was placed under the transcriptional control of the 280-bp SM22α promoter. These mice contained between 2 and 34 copies of the transgene per cell. The 280-bp of 5' flanking sequence was sufficient to direct high level β-galactosidase activity (blue staining) to arterial SMCs and the myotomal component of the somites of EDI 1.5 mice. Virtually identical patterns of transgene expression were demonstrated in 4 independent lines analyzed at EDI 1.5 in which copy numbers varied between 2 and 34 copies per cell. Interestingly, dense blue staining was detected within the cardiac outflow tract (a neural crest derivative) while a somewhat patchy pattern of blue staining was present in the developing arterial system (which is derived from lateral mesoderm and neural crest). Higher power sections confirmed that virtually every cell within the cardiac outflow tract stained blue. Interestingly, dense blue staining was detected within the mesenchymal cells that compose the aorticopulmonary spiral septum which is present at EDI 1.5. In addition, most, but not all, cells underlying the epithelium of the developing arteries stained blue. Taken together, these data demonstrate that the 280-bp SM22α promoter is sufficient to program lineage-restricted transcription in arterial SMCs and the developing somites. However, in contrast to the endogenous pattern of SM22α gene expression, the 441-bp (and 280-bp) SM22α promoter does not contain the ci.s-acting elements that control SM22α transcription in either visceral (gastrointestinal, uterine, bladder, and bronchial) or venous SMCs nor in the primitive heart tube. Finally, the inventors observed virtually the same arterial SMC-specific pattern of expression using the 5000-bp SM22α promoter in transgenic mice. These data strongly suggest that distinct transcriptional programs distinguish tissue-restricted subsets of SMCs (even within the vasculature). Xgal tissue staining The lung, heart, liver, kidney, spleen, testis or ovary, and skeletal muscle are excised from euthanized animals, and stained to reveal β-galactosidase activity. If β-galactosidase activity is evident in non-transgenic mice, the transgenic lines are generated using a nuclear localizing β-galactosidase isoform to minimize false-positive staining (Hughes and Blau, 1990). To reveal β-galactosidase activity, tissues are washed in PBS, then fixed in 1.25% glutaraldehyde (lung is fixed as below). After washing in Ca + - and Mg +2 -free buffer, tissues are incubated overnight in the dark in Xgal solution (50 mM Tris HCI pH 7.5, 2.5 mM potassium ferriferrocyanide, 15 mM NaCl, 1 mM MgCl 2 , 0.5 mg/ml Xgal), then paraffin embedded; 4 micron sections are counterstained with eosin. Data analysis The tissue and cellular distribution of Xgal staining, reflecting SM22α promoter transcriptional activity, is recorded for each transgenic line studied, and compared qualitatively among experimental conditions. Quantitative assessment of lung and tracheal SM22α promoter transcriptional activity is also performed by RNase protection assay for lacZ mRNA, which is compared among study groups using ANOVA followed by multiple range testing. To test whether potential differences in lacZ mRNA levels might stem from different amounts of smooth muscle among groups, airway smooth muscle area vs. circumference curves is compared between groups as described by James et al. (1989); pulmonary arterial area vs. circumference curves are likewise compared. Example 7 Expression of SM22α in Lung SM22α mRNA by is detected in the lungs by in situ hybridization. A digoxigenin- labeled cRNA corresponding to the reverse complement of mouse SM22α cDNA bp 644 to 1007 was prepared by in vitro transcription (MaxiScript™ Kit, Ambion, and Genius™ 4 Kit. Boehringer Mannheim). In situ hybridization was performed on a lung specimen obtained at autopsy from a patient without lung disease. Hybridized probe is detected immunohistochemically with an anti-dioxigenin antibody linked to alkaline phosphatase. The SM22α cRNA binds selectively to airway smooth muscle and to pulmonary vascular smooth muscle: black anthracotic pigment was also evident in this specimen (typical of urban dwellers). Example 8 Adenovirus Mediated Expression of a Heterologous Gene Product in vitro The 441-bp murine SM22α promoter has been shown previously to program arterial SMC-specific gene expression in transgenic mice (Kim et al . 1997; Li et al , 1996b: Moessler et al, 1996). To test whether the SM22α promoter could be utilized to restrict the expression of a recombinant gene product encoded by a RDAd to SMCs, a RDAd (AdSM22- lacZ) was constructed containing the bacterial lacZ reporter gene under the transcriptional control of the murine SM22α promoter (FIG. 3 A, upper panel). In the studies described here, the activity of AdSM22-lacZ was compared to that of the control virus, AdCMV-lacZ (Tripathy et al, Proc. Natl. Acad. Sci. USA, 91 : 1 1557-1 1561 , 1994), in which the bacterial lacZ reporter gene is under the transcriptional control of the ubiquitously active cytomegalovirus (CMV) immediate early gene promoter/enhancer (FIG. 3A. lower panel). To assess the activity of AdSM22-lacZ in cells transduced in vitro, replicate cultures of primary rat aortic SMCs were infected with 1-, 10- and 100-plaque forming units (PFU)/cell of either AdSM22-lacZ or AdCMV-lacZ and the fraction of cells expressing histochemically identifiable β-galactosidase activity (as assessed by blue staining with Xgal) was quantitated. As shown in FIG. 3B, 12, 80, and 88% of cells expressed the lacZ transgene following infection with 1-, 10- and 100-PFU/ceI 1 , respectively, of AdSM22-lacZ. The fraction of cells expressing β-galactosidase was comparable to that observed following infection of replicate cultures with the control AdCMV-lacZ virus (FIG. 3B). Consistent with these findings, 10, 70 and 90%, respectively, of immortalized A7r5 vascular SMCs expressed the lacZ transgene following infection with 1-, 10-and 100-PFU/cell of AdSM22-lacZ. This efficiency of transgene expression was, again, comparable to that observed following infection of this immortalized SMC line with the AdCMV-lacZ control virus. To determine whether the SM22α promoter restricted expression of the lacZ reporter gene to SMCs, primary human umbilical vein endothelial cells (HUVECs) and NIH 3T3 fibroblasts were infected with AdSM22-lacZ or the AdCMV-lacZ control virus. In contrast to the high efficiency of transgene expression observed following AdSM22-lacZ-mediated infection of primary and immortalized SMCs (FIG. 3B), β-galactosidase activity was not detectable in HUVECs or NIH 3T3 cells following infection with AdSM22-lacZ (FIG. 3B). In contrast, 10, 60, and 93% of HUVECs expressed histochemically detectable β- galactosidase activity following infection with 1-, 10-, and 100-PFU, respectively, of the AdCMV-lacZ control virus (FIG. 3B). Similarly, approximately 50% of NIH 3T3 cells expressed-detectable β-galactosidase activity following infection with 100-PFU/cell of the AdCMV-lacZ control virus. Southern blot analyses of DNA harvested from HUVECs infected 72-h previously with AdSM22-lacZ demonstrated the presence of the lacZ transgene in these cells. The hybridization signal was comparable in intensity to that obtained with DNA harvested from HUVECs infected with the AdCMV-lacZ control virus thereby confirming efficient infection of these cells by AdSM22-lacZ. The different sizes of the lacZ hybridizing bands seen in this study is consistent with the expected patterns of restriction endonuclease digestion of each adenoviral vector with Bglll. Despite the fact that AdSM22-lacZ and AdCMV-lacZ both efficiently infected HUVECs, no lacZ transgene mRNA was detected in the AdSM22-lacZ infected HUVECs by Northern blot analysis. In contrast, HUVECs infected with the control AdCMV-lacZ virus expressed abundant lacZ mRNA. Taken together, these data demonstrated that AdSM22-lacZ programs SMC-specific transgene expression in vitro and confirmed that the lineage-restricted expression of the transgene was regulated at a transcriptional or post-transcriptional level. The pAdSM22 plasmid was generated by subcloning the 441-bp murine SM22α promoter (Solway et al, 1995) into Clal (5' endVHindlll (3' end)-digested pAdEFl (KN) plasmid (Tripathy et al, 1994). The pAdSM22-lacZ plasmid was generated by subcloning the Hindlll (5' end)/BglII (3' end)-linkered bacterial lacZ reporter gene into the Flindlll/BamHI- digested pAdSM22 plasmid. The AdSM22-lacZ adenovirus encoding the bacterial lacZ reporter gene under the transcriptional control of the murine SM22α promoter and the human 4F2 heavy chain transcriptional enhancer (Kaφinski et al, Mol. Cell Biol. 9:2588-2597. 1989) was generated by recombination in 293 cells between the pAdSM22-lacZ plasmid DNA and El- and E3-deleted Ad5Sub360 genomic DNA digested with Xbal and Clal as described previously (Barr et al, 1994) The structure of this virus was confirmed by Southern blot analyses. The AdCMV-lacZ RDAd encoding the bacterial lacZ reporter gene under the transcriptional control of the cytomegalovirus (CMV) immediate early gene promoter/enhancer has been described previously (Barr et al. 1994). Recombinant viruses were plaque purified three times to avoid contamination with replication-competent virus. High titer adenoviral stocks were prepared by infecting 293 cells with 2- to 5-plaque forming units (PFU) of virus per cell as described previously (Barr et al. 1994). Titers of each cesium chloride purified viral stock were determined from the absorbance at 260 nm (1 absorbance unit = 10 PFU/ml) and were confirmed by plaque assay as described previously (Barr et al. 1994). The studies described in this example were performed as follows: Primary rat aortic SMCs were isolated from 12- to 16-wk old Sprague Dawley rats and grown as described previously (Chang et al, 1995a). Virtually all cells stain positive for expression of SM-α- actin when isolated using this technique (Solway et al, 1995). In all experiments only third passage primary rat aortic SMCs were utilized. Immortalized rat vascular A7r5 SMCs, passage 4 human umbilical vein endothelial cells (HUVECs), and mouse NIH 3T3 fibroblasts were grown as described previously (Kim et al, 1997). Cells were placed in medium containing 2% fetal bovine serum (FBS) and infected with either 1-, 10- or 100-PFU/cell of purified adenoviral stocks. Following infection, cells were washed in PBS and placed in growth medium containing 10%> FBS. 72-h post-infection, cells were harvested for preparation of DNA and RNA, or were fixed and stained for β-galactosidase activity with X- gal as described (Lin et al, 1990). The unstained and blue-stained (β-gal + ) cells from 10 representative high power fields were counted in each section and the percentage of β-gal + cells calculated. The data are expressed as % β-galactosidase positive cells ± S.D. All experiments involving animals were approved by the University of Chicago Committee on Animal Care and Use. The Sprague-Dawley rats were housed and cared for according to NIH guidelines in the A. J. Carlson Animal Research Facility at the University of Chicago. Southern and Northern blot analyses were performed as described previously (Parmacek and Leiden, 264:13217-13225, 1989). The polymerase chain reaction (PCR)- generated 485-bp bacterial lacZ probe (which corresponds to bp 962-1448 in the pCMVβ plasmid (Clonetech)) was radiolabelled and used for the Southern and Northern blot analyses. Quantitative image analyses were performed using a Molecular Dynamics Phosphorlmager (Sunnyvale. CA.). Example 9 Intra- Arterial Administration of RDAd in Uninjured and Balloon-Injured Rat Carotid Arteries After induction of anesthesia and intubation, the left and right carotid arteries of adult Sprague-Dawley rats were isolated and a balloon-injury was created by dilatation with a 2F Fogarty catheter as described previously (Chang et al, 1995a). A 24-gauge intravenous catheter was introduced into the lumen of uninjured or balloon-injured arterial segments and 2 X 10 9 -PFU of AdSM22-lacZ or AdCMV-lacZ was instilled into the isolated arterial segment for 5 minutes. Seven days following infection, rats were euthanized and the isolated segments of carotid artery were removed, fixed in 1.25% glutaraldehyde, and stained for β- galactosidase activity with X-gal as described previously (Lin et al, 1990). Photomicroscopy was performed using Kodak EPT 160 film and a Zeiss Axiophot microscope. To determine whether the SM22α promoter could be used to restrict adenovirus- mediated transgene expression to arterial SMCs in vivo, 2 X 10 9 PFU of either AdSM22-lacZ or the control AdCMV-lacZ virus were introduced into isolated segments of uninjured and balloon-injured rat carotid arteries. Diffuse blue staining of the vascular endothelium was observed seven days following administration of the control AdCMV-lacZ virus into the uninjured rat carotid artery. In addition, rare cells within the adventitia also stained blue. In contrast, when AdSM22-lacZ was introduced into the uninjured rat carotid artery, β- galactosidase activity was not observed within either endothelial or adventitial cells. However, rare lacZ-expressing SMCs were observed in the superficial (abluminal) layer of the tunica media. These data suggested that the SMC-specificity of AdSM22-lacZ transgene expression is maintained following intra-arterial administration of AdSM22-lacZ into an isolated segment of the uninjured rat carotid artery. To determine the cell-specificity of transgene expression in balloon-injured rat carotid arteries, 2 X 10 -PFU of AdSM22-lacZ was instilled into an isolated segment of the rat carotid artery for 5 minutes immediately following balloon injury. Seven days post-infection, the injured arterial segments were isolated and the pattern of β-galactosidase expression was compared to that observed in the uninfected balloon-injured contra lateral artery. In contrast to the low level β-galactosidase activity observed in the uninjured carotid artery infected with the AdSM22-lacZ virus, higher efficiency gene transfer was achieved in these balloon-injured arterial segments. The majority of the SMCs expressing β-galactosidase activity were located within the tunica media. In addition, rare cells within the neointima also stained light blue. Consistent with previous reports, gene transfer was preferentially observed in the SMCs underlying the site of neointimal proliferation. Finally, lacZ transgene expression was not observed in endothelial cells at the margins of the vessel wall injury, where endothelial cells remained intact. Taken together, these data demonstrated that the AdSM22-lacZ virus maintains its SMC-specific pattern of transgene expression following intra-arterial administration and that it can be used to efficiently transduce arterial SMCs in the balloon- injured rat carotid artery. Example 10 Intravenous Administration of RDAd Intravenous administration of RDAd results in high level gene transfer to the liver and lung thereby potentially limiting the utility of these viruses in some clinical settings (Kashyap et al, 1995; Johns et al, 1995; Miller and Vile, 1995). 12-16 week old Sprague-Dawley rats were injected intravenously with 10 9 - or 10 10 -PFU of AdSM22-lacZ or AdCMV-lacZ, respectively. Liver function tests were performed on serum samples obtained 7 days following infection using Kodak DT60II and DTSCH automated analyzers. To determine the significance of alterations in liver function tests observed between control, AdSM22-lacZ- infected. and AdCMV-lacZ-infected rats, Student's t tests were performed. 7-days post- injection, rats were euthanized and the injected tissue, as well as the liver, lung, kidney, and carotid arteries were isolated, washed, fixed and stained for β-galactosidase activity with X- gal as described previously (Lin et al, 1990). LacZ expression was observed throughout the livers of rats infected with the AdCMV- lacZ control virus. In addition, focal patches of β-gal + cells were observed within perivascular regions of the lung of AdCMV-lacZ-infected rats. In contrast, seven days after infection with AdSM22-lacZ, histological sections of both the liver and lung were indistinguishable from those obtained from uninfected control rats. These data suggest that in contrast to RDAd containing virally-driven and/or ubiquitously active transcriptional regulatory elements. AdSM22-lacZ restricts transgene expression to SMCs following intravenous administration. To determine whether intravenous administration of AdSM22-lacZ caused abnormalities in liver function despite the finding that the lacZ reporter gene encoded by this virus was not expressed in this tissue, adult Sprague Dawley rats were injected intravenously (IV) with -10 -PFU of the AdSM22-lacZ virus and liver function tests were performed on serum samples obtained seven-days post-infection. No statistically significant elevations in serum alkaline phosphatase (AP), alanine aminotransferase (ALT), aspartate aminotransferase (AST),γ-glutamyltranspeptidase (GGT), total bilirubin, total protein and albumin were observed in rats infected with the AdSM22-lacZ virus (see Table 1) (p > 0.05). However, small, but consistent, elevations in the mean serum concentrations of ALT. AST, AP were observed. In contrast, statistically significant elevations in ALT and AST serum concentrations were observed seven days following intravenous administration of 10 -PFU of the AdCMV-lacZ control virus (p < 0.05). In addition, increased serum concentrations of AP and bilirubin were observed in rats receiving 1 X 10 -PFU of the AdCMV-lacZ virus (p < 0.09). Thus, intravenous administration of high doses of AdSM22-lacZ did result in mild elevations in liver function tests. However, the liver function test abnormalities were significantly less marked than those observed in rats infected with identical doses of the AdCMV-lacZ control virus. Table 1 ALT AST AP Bili Alb Control 61±4 97±8 229+38 O.l±O.O 2.9+0.1 10 10 SM22-lacZ 104+33 137+21 306+37 0.1+0.0 3.7+0.2 10 10 CMV-lacZ 153+16* 166+21 * 442+103** 0.3+0.2** 3.3+0.2 Data are expressed as mean ±S.E.M. *p<0.05 versus control values **p<0.09 versus control values Example 1 1 Direct Injection of RDAd into Visceral SMCs and Skeletal Muscle Direct injection of AdSM22-lacZ into SMC-containing tissues and skeletal muscle was performed following induction of anesthesia and intubation as described above. 10 -PFU of the AdSM22-lacZ virus was injected directly with a 30-gauge needle into the wall of the ureter, the bladder wall or intramuscularly. The site of each injection was marked by a suture. Seven days after injection, the sites of injection were isolated, fixed and stained for β- galactosidase activity as described (Lin et al, 1990). Dense blue staining was observed throughout the longitudinal and circumferential layers of SMCs within the wall of the ureter. In contrast, β-galactosidase activity was not observed within the epithelial cells lining the lumen of the ureter. Following direct injection of AdSM22-lacZ into the bladder mucosa, focal patches of β-gal + SMCs were observed surrounding the site of injection. In contrast, β-galactosidase activity was not observed within the bladder epithelium. These data demonstrated that AdSM22-lacZ programs transgene- expression in visceral, as well as vascular, SMCs. The 441-bp murine SM22α promoter is active in embryonic skeletal muscle cells and the somites of transgenic mice (Kim et al , 1997). To determine whether AdSM22-lacZ programs transgene expression in adult skeletal muscle in vivo, 10 9 -PFU of the AdSM22-lacZ virus was injected intramuscularly into the rat rectus abdominus and quadriceps muscles. In contrast to the dense blue staining observed in visceral SMCs following direct injection into the wall of the ureter and bladder, β-galactosidase activity was not observed in either the rectus abdominus or quadriceps muscles. Thus, the lacZ reporter gene encoded by AdSM22- lacZ is expressed exclusively in visceral and vascular SMCs when administered intra- arterially, intravenously, or intra-muscularly. Example 12 Adenovirus Mediated Expression of a Cell Cycle Control Gene The Rb protein inhibits cell cycle progression in many mammalian cell types (Hollmgsworth et al , Curr Opin Genet Dev 3 55, 1993), and has been shown to be an important regulator of vascular smooth muscle proliferation (Chang et al , 1995a) In its unphosphorylated state, the Rb gene product binds and inactivates certain cellular transcription factors that are required for cell cycle progression (Chen et al , Cell, 58 1193, 1989) and upon phosphorylation, the transcription factors are released and the cell progresses through the proliferation cycle A gene encoding a phosphorylation deficient Rb gene product has been constructed and shown to constitutively inhibit smooth muscle cell cycle proliferation (Chang et al , 1995a) when transfected into rat aortic smooth muscle cells in a replication defective adenovirus vector Further, the Chang reference also shows that replication defective adenovirus vectors can be used to express heterologous genes in rat carotid arteries in vivo upon direct exposure of isolated segments of injured artery to the adenovirus A similar study was done in isolated porcine arteries and again the adenoviral transferred constitutive Rb gene product was shown to be expressed and to inhibit smooth muscle cell proliferation In a prophetic example of the present invention, this phosphorylation deficient Rb gene product may also be expressed under the control of the smooth muscle specific promoter contained in an adenovirus vector as disclosed herein, thus directing expression of the Rb gene product specifically in smooth muscle cells Such administration is contemplated to arrest smooth muscle cell proliferation when the described vector expressing Rb from the SM22α promoter is administered to an animal or human subject as described in the previous examples, particularly following arterial balloon injury This method of preventing restenosis or other smooth muscle cell proliferative disordeis offers the advantage of administration of the virus vector by a less invasive method such as intravenous injection It is also contemplated that other cell cycle control gene products, such as p53 for example would be effectiv e in this method of preventing restenosis Example 13 Identification of Smooth Muscle Specific Trans-Acting Transcription Factors Identification of nuclear protein binding sites in the SM22α promoter To identify nuclear protein binding sites within the 441 -bp SM22α promoter, DNase I footprint analyses were performed. Three overlapping genomic subfragments (bp -441 to - 256, bp -256 to -89, and bp -89 to +41) spanning the 482-bp (bp -441 to +42) SM22α promoter were subjected to DNase I footprint analyses using nuclear extracts from the SMC line, A7r5 (which express high levels of SM22α mRNA) and NIH 3T3 cells. The sense and antisense strands of the three genomic subfragments were end-labeled and incubated in the absence (control) or presence of A7r5 and NIH 3T3 (3T3) of nuclear extracts before partial digestion with DNase I (concentrations varied from 5 U/ml to 22.5 U/ml). Standard Maxam and Gilbert purine (G + A) sequencing reactions were run in parallel. The six protected regions identified on both strands with A7r5 nuclear extracts were designated smooth muscle elements (SME)-l-6, respectively. Two footprinted regions, SME-1 (bp -279 to -256) and SME-4 (bp -171 to -136), contain embedded SREs, or CArG boxes (CCWWWWWWGG, SEQ ID NO:47), that have been shown previously to bind the MADS box transcription factor, SRF, and play an important role in regulating transcription of the genes encoding skeletal and cardiac α-actin (Minty et al, 1986; Moss et al . J. Biol. Chem., 269:12731, 1994; Muscat et al, Gene Exp. 2: 1 1 1, 1992). Fine differences in the digestion patterns between nuclear extracts prepared from A7r5 and NIH 3T3 cells could be distinguished over the SME-4 site. Several studies suggest that nucleotides embedded within and/or flanking CArG boxes regulate binding of ternary complex factors (TCFs). including members of the ets and homeodomain families of transcription factors. Thus, the finding that a PEA3 motif (bp -295 to -289), which has been demonstrated to bind in vitro to ets family members, lies 23-bp 5' of the SME-1 motif is noteworthy. Similarly. SME-4 spans a GGAG motif (bp -142 to bp -139) which has been demonstrated to bind to TCFs in the ets family of transcription factors (Johansen and Prywes, Biochem. Biophys. Acta. 1242: 1-10, 1995). Moreover, the SME-4 motif contains the embedded motif ATATGG (bp -146 to bp -141) which has been demonstrated to bind homeobox transcription factors including Csx/Nkx2.5 (Chen et al . 1996). The SME-2 nuclear protein binding site (bp -249 and bp -216) contains consensus binding motifs for the ubiquitously expressed transcription factors, Spl (KRGGCKRRK) and AP2 (CCCMNSSS). Fine differences in the digestion patterns between nuclear extracts prepared from A7r5 and NIH 3T3 cells could be distinguished over this site. The SME-3 nuclear protein binding site (bp -215 to bp -186), which is flanked by DNase I hypersensitive sites at both its 5' and 3' borders, was protected only by nuclear extracts prepared from A7r5 and not by extracts prepared from NIH 3T3 cells. This nuclear protein binding site has not been described previously. The SME-5 nuclear protein binding site (bp -86 to bp -66) once again contains consensus Spl and AP2 motifs. The SME-6 nuclear protein binding site (bp - 59 to -35). lies immediately 5' of the non-consensus TATA box (TTTAA). and contains nucleotide sequences that have been demonstrated previously to bind the cyclic AMP response element (CRE) binding proteins (for review see Lalli and Sassone-Corsi. 1994). An AT-rich sequence (bp -408 to -415) with 8/10 bp sequence identity with the consensus MEF2 binding motif (Gossett et al, 1989) was not protected with either A7r5 or NIH 3T3 nuclear extracts. Taken together, these studies demonstrated six nuclear protein binding sites within the murine SM22α promoter. Three of these binding sites (SME-2. SME-3 and SME-4) demonstrated differential patterns of digestion when incubated with nuclear extracts prepared from A7r5 and NIH 3T3 cells. Characterization of trans-ac mg factors that bind to the SM22α promoter. To assess the number, specificity, and identity, of nuclear proteins that bind to the arterial SMC-specific SM22α promoter, a series of electrophoretic mobility shift assays (EMSAs) were performed. To determine whether the SME-1 /CArG and SME-4/CArG bind common, overlapping, or distinct, sets of trαns-acz ng factors, EMSAs were performed using radiolabeled SME-1 and SME-4 oligonucleotide probes. The radiolabeled SME-1 oligonucleotide probe bound three specific nuclear protein complexes, designated A-C, as determined by addition of specific and non-specific unlabeled competitor oligonucleotides to the binding reactions. Unlabeled SME-4 oligonucleotide competed for binding of complex A, but failed to compete for complexes B and C. Unlabeled Spl oligonucleotide competed for binding of complex B (that co-migrated with complex A), as well as, complex C. Antibody supershift studies confirmed that complex A contains SRF (or an antigenically related protein) and complex B contains Spl (or an antigenically related protein). EMSAs performed with the radiolabeled SME-4 oligonucleotide probe demonstrated four specific nuclear protein complexes, designated A-D, as determined by addition of specific and non-specific competitor oligonucleotides. Addition of unlabeled SME-1 oligonucleotide competed only for binding of complexes A and B. Antibody supershift studies revealed that both of these low-mobility nuclear protein complexes contained a protein identical, or antigenically-related, to SRF, while complexes C and D contained a protein identical, or antigenically-related, to YYl . Taken together, these data demonstrate that, as expected, SRF (or an SRF-containing protein complex) binds to both the SME-1 and SME-4 sites. The demonstration of two low mobility SME-4 binding activities containing SRF (complexes A and B) suggests that one, or both, of these complexes may contain additional trø«.s-acting factors. In addition, SME-1 bound Spl (complex B) and one potentially novel nuclear protein complex (complex C) that does not bind to SME-4. Conversely, SME-4 binds the ubiquitously expressed and potentially negative regulatory factor, YYl (Gualberto et al, Mol. Cell. Biol 12:4209, 1992; Lee et al, Proc. Natl. Acad. Sci., USA 89:9814. 1992; Lee et al, Oncogene 9:1047, 1994) (complexes C and D), while SME-1 does not. Both the SME-2 and SME-5 sites are GC-rich motifs that contain potential Spl and AP2 motifs. EMSAs performed with nuclear extracts prepared from primary rat aortic SMCs and radiolabeled oligonucleotides corresponding to the SME-2 and SME-5 nuclear protein binding sites, respectively, revealed identical band-shift patterns suggesting that these two motifs might bind a common set of /ram-acting factors. Each probe bound three specific nuclear protein complexes, designated A-C, as determined by addition of unlabeled specific and non-specific oligonucleotide competitors. Unlabeled SME-2 oligonucleotide competed for binding of each nuclear protein complex that bound the radiolabeled SME-5 probe and visa versa. Moreover, an oligonucleotide containing a consensus Spl motif competed for binding of complexes A-C. Antibody supershift studies revealed that complex A was ablated and supershifted by pre-incubation with Spl -specific antiserum, but not by control murine IgG, or α-AP2 antiserum. Each of these nuclear protein complexes were also present in nuclear extracts prepared from non-SMC lineages including the lymphoid lines. WEHI and 70Z/3. These data demonstrate that the SME-2 and SME-5 nuclear protein binding sites each bind three ubiquitously expressed nuclear protein complexes, at least one of which contains a protein that is identical, or antigenically related, to Spl . As discussed above, SME-3 was protected from DNase I digestion by nuclear extracts prepared from A7r5 cells, but not by extracts prepared from NIH 3T3 cells, suggesting that this previously undescribed motif might bind one or more SMC lineage-specific trans-acting factors. EMSAs performed with the radiolabeled SME-3 oligonucleotide probe revealed three specific binding activities, designated A-C, as determined by addition specific and nonspecific competitor oligonucleotides. Antibody supershift studies revealed that complex B and C contained YYl (or an antigenically related protein). None of the nuclear protein complexes were supershifted by control IgG or α-Spl antiserum. To determine whether any of these nuclear protein complexes were expressed in a lineage-restricted fashion, EMSAs were performed with the SME-3 probe and nuclear extracts prepared from primary rat aortic SMCs, the SMC line. A7r5, C3H10T1/2 and NIH 3T3 fibroblasts, and the mouse T cell line, EL4. Interestingly, complex C, which was ablated by pre-incubation with a- YYl antiserum, was present only in primary rat aortic SMCs and the SMC line A7r5, but was absent in C3H10T1/2, NIH 3T3, and EL4 nuclear extracts. Moreover, three faint complexes were identified in C3H10T1/2, NIH 3T3 and EL4 cells, but were not present in SMC extracts. Taken together, these data suggest that the SME-3 nuclear protein binding site, a motif which has not been described previously, binds YYl and one or more, as yet, unidentified SMC- specific and/or lineage restricted trαns-acting factors. In addition, the radiolabeled SME-3 probe binds three nuclear protein complexes that are present in several non-SMC lines, but not in primary vascular SMCs or the SMC line, A7r5. EMSAs performed with a radiolabeled oligonucleotide corresponding to the SME-6 nuclear protein binding site revealed four specific nuclear protein complexes, designated A- D, respectively. Each of these complexes were competed with unlabeled SME-6 oligonucleotide. Moreover, addition of an unlabeled consensus CRE oligonucleotide derived from the T cell receptor a enhancer competed exclusively for binding of complexes B and C. Pre-incubation of the binding reactions with α-CREB-1 antiserum ablated and supershifted complex B, while complex C was ablated by addition of α-ATF-1 antiserum. In addition, complex A was ablated and supershifted by pre-incubation with α-Spl antiserum. Finally, complex D was ablated by the addition of α-YYl antiserum. In contrast, none of the four complexes were ablated or supershifted following pre-incubation with control rabbit or murine IgG, or antisera that recognize GATA-4 or SRF. Interestingly, EMSAs performed with the radiolabeled SME-6 oligonucleotide probe and nuclear extracts prepared from the non-SMC lines, C2C12 myotubes, C3H10T1/2 and NIH 3T3 fibroblasts, and EL4 T cells, revealed fine differences in the mobilities of several nuclear protein complexes (and/or novel complexes), as well as, increased intensity in each of the SME-6 binding activities. Taken together, these data revealed that the SME-6 motif binds CREB-1 and ATF-1, each of which are expressed in primary vascular SMCs, as well as, the ubiquitously expressed transcription factors, Spl and YYl . In summary, as shown in FIG. 2, the arterial SMC-specific SM22α promoter contains six nuclear protein binding sites, designated smooth muscle element (SME)l-6. respectively. SME-1 /CArG binds SRF (and ternary complex factors), Spl and one unidentified nuclear protein complex that is not cross-competed by SME-4/CArG oligonucleotides. SME-2 binds three specific nuclear protein complexes at least one of which contains Spl , each of which also binds to the SME-5 site. SME-3, a motif that has not been described previously, binds YYl and two unidentified nuclear protein complexes, one of which includes a potentially novel lineage-restricted trøra'-acting factor. In addition, the SME-3 motif binds several transacting factors which are present in nuclear extracts prepared from non-SMCs but which are not present in SMC extracts. SME-4/CArG binds nuclear protein complexes containing SRF and YYl -related proteins. Two high mobility complexes were ablated and supershifted by pre-incubation with a-SRF antiserum suggesting that one, or both, of these nuclear protein complexes may contain accessory factors. Finally, SME-6 binds CREB-1 , ATF-1 , YYl, and Spl. Example 14 Functional characterization of the SM22α promoter To characterize the functional significance of each of the cis-acting elements within the SM22α promoter, specific mutations that abolish binding of one or more trαns-ac ng factors to nuclear protein binding sites located within the SM22α promoter were created within the context of the p-441SM221uc reporter plasmid. The effect of each mutation was assessed by transient transfection analysis of each mutant SM22α promoter luciferase reporter plasmid into primary rat aortic SMCs. To assess the function of the SME-1/CArG and SME-4/CArG sites, each of which bind SRF, mutations were created that abolish SRF binding to SME-1, and SRF and YYl binding to SME-4, respectively. These mutations did not affect binding of any other nuclear protein complex (demonstrated by EMS A) to SME-1 or SME-4. Transfection analyses revealed that mutation of the SME-1 site resulted in a 55% reduction in normalized luciferase activity compared to that obtained with the p-441 SM221uc plasmid. Remarkably, a two nucleotide substitution in the SME-4 site that abolished SRF binding activity resulted in a 88% reduction in normalized luciferase activity compared to that obtained with the wild type SM22α promoter. Moreover, the p-441 SM22μCArG plasmid, which contains mutations in both SME-1 and -4 that inhibit binding of SRF, completely abolished transcriptional activity of the SM22α promoter in primary rat aortic SMCs and the SMC-line A7r5. These data demonstrate that the SME-1 and -4 nuclear protein binding sites are required for activity of the SM22α promoter in arterial SMCs in vitro. Moreover, these data suggest that SM22α promoter activity is critically-dependent upon the SME-4 site, SRF, and/or trαns-acting factors that interact with SRF. To assess the functional significance of each of the other (non-CArG containing) nuclear protein binding sites in the SM22α promoter, mutations that abolish binding of one or more trαns-acting factor to each site were created within the context of the 441-bp SM22α promoter containing plasmid, p-441SM221uc. Because the SME-2 and SME-5 nuclear protein binding sites, each bind a nuclear protein complex containing Spl. in addition to two other common nuclear protein complexes, mutations were created within the context of the p- 441 SM22-luc plasmid that abolish binding of each trans-acting factor to SME-2. SME-5, and both SME-2 and SME-5. Transfection of each of these plasmids and the p-441 SM22-luc plasmid into primary rat aortic SMCs demonstrated that mutation of the SME-2. SME-5, and SME-2 and SME-5, resulted in 58%, 6% and 70% respective reductions in normalized luciferase activities. These data suggest that within the context of the SM22α promoter, the SME-2, and -5 nuclear protein binding sites are required for full promoter activity, but may be functionally redundant. Mutation in the SME-3 site which abolishes binding of all three SME-3 binding activities (including the potentially novel lineage-restricted /ram-acting factor) resulted in a 50%) reduction in transcriptional activity compared to that observed with the native SM22α promoter. These data suggest either that activity of the SM22α promoter in arterial SMCs is not critically dependent on this potentially novel lineage-restricted trα '-acting factor, or alternatively, that an additional nuclear protein binding site for this lineage-restricted transacting factor exists in the 441-bp SM22α promoter (that was not detected by DNase I footprint analyses and EMSAs). To assess the functional significance of the SME-6 nuclear protein binding site, and to determine whether the CRE located within SME-6 is required for promoter activity, the -441SM22μCREB/SME-6 plasmid, which abolishes binding specifically of each of the CRE-related complexes (but not YYl) was compared to the p- 441SM221uc reporter plasmid. The single mutation within the CREB motif reduced transcriptional activity by approximately 60% . In contrast, mutations within SME-6 that do not abolish CRE binding activities did not significantly decrease transcriptional activities. These data suggest that CREB family members may play an important functional role in transcription of the SM22α gene in VSMCs. The arterial SMC-specific SM22α promoter is CArG-dependent in vivo As shown above, mutations of the SME-1 /CArG and SME-4/CArG elements that inhibited binding of SRF to the SM22α promoter, totally abolished SM22α promoter activity in arterial SMCs in vitro. To determine whether SME-1 and -4 are required for activity of the SM22α promoter in arterial SMCs (and the myotomal component of the somites) in vivo, transgenic mice were produced containing a transgene, designated -441 SM22μCArG, that encodes the bacterial lαcZ reporter gene under the transcriptional control of a mutant SM22α promoter containing mutations in both SME-1 and SME-4 that abolish binding of SRF (as described above). Thirteen independent -441 SM22μCArG transgenic lines were produced with copy numbers ranging between 1 and 730 copies per cell. In contrast to the - 44\ SM22lacZ transgenic mice that expressed the lacZ transgene in the arterial SMCs and within the myotomal component of the somites, in 12 out of 13 independent - 441SM22μCArG lines, β-galactosidase activity could not be detected in either the arterial SMCs or within the myotomal component of the somites at EDI 1.5. In one line harboring the -441 SM22μCArG transgene (that contained 5 copies per cell), blue staining was detected exclusively within the cardiac outflow tract, but not within the SMCs of the dorsal aorta or branch arteries, the somites, or any other tissue. Given the low frequency at which this pattern of lacZ expression was observed, it is likely that it resulted from integration of the transgene near a cryptic enhancer element. These data demonstrate that the SME-1 and SME- 4 nuclear protein binding sites located within arterial SMC-specific SM22α promoter are required for SM22α promoter activity in vivo. Moreover, these data suggest strongly that SRF plays an important role in regulating activity of the SM22α promoter in vivo. While the compositions and methods of this invention have been described in terms of preferred embodiments, it will be apparent to those of skill in the art that variations may be applied to the composition, methods and in the steps or in the sequence of steps of the method described herein without departing from the concept, spirit and scope of the invention. More specifically, it will be apparent that certain agents which are both chemically and physiologically related may be substituted for the agents described herein while the same or similar results would be achieved. All such similar substitutes and modifications apparent to those skilled in the art are deemed to be within the spirit, scope and concept of the invention as defined by the appended claims. SEQUENCE LISTING (1) GENERAL INFORMATION: (i) APPLICANT: (A: NAME: Arch Development Corporation (B STREET: 1101 East 58th Street (C CITY: Chicago (D STATE: Illinois (E COUNTRY: USA (F POSTAL CODE (ZIP) : 60637 (A NAME: Michael S Parmacek (B STREET: 1225 E. 56th Street (C CITY: Chicago (D STATE : IL (E COUNTRY: USA (F POSTAL CODE (ZIP 60637 (A NAME: Julian Solway (B STREET: 746 Grove Street (C CITY: Glencoe (D STATE : IL (E COUNTRY: USA (F POSTAL CODE (ZIP) : 60022 (ii) TITLE OF INVENTION: PROMOTER FOR SMOOTH MUSCLE CELL EXPRESSION (iii) NUMBER OF SEQUENCES: 51 (iv) COMPUTER READABLE FORM: (A) MEDIUM TYPE: Floppy disk (B) COMPUTER: IBM PC compatible (C) OPERATING SYSTEM: PC-DOS/MS-DOS (D) SOFTWARE: Patentln Release #1.0, Version #1.30 (EPO) (v) CURRENT APPLICATION DATA: APPLICATION NUMBER: Unknown (vi) PRIOR APPLICATION DATA: (A) APPLICATION NUMBER: US 08/726,807 (B) FILING DATE: 07-OCT-1996 (2) INFORMATION FOR SEQ ID NO : 1: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 1419 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS : single (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 1: GAATTCAGGA CGTAATCAGT GGCTGGAAAG CAAGAGCTCT AGAGGAGCTC CAGCTTATTA 60 TGACCCTTCC TTCAGATGCC ACAAGGAGGT GCTGGAGTTC TATGCACCAA TAGCTTAAAC 120 CAGCCAGGCT GGCTGTAGTG GATTGAGCGT CTGAGGCTGC ACCTCTCTGG CCTGCAGCCA 180 GTTCTGGGTG AGACTGACCC TGCCTGAGGG TTCTCTCCTT CCCTCTCTCT ACTCCTTTCT 240 CCCTCTCCCT CTCCCTCTCT CTGTTTCCTG AGGTTTCCAG GATTGGGGAT GGGACTCAGA 300 GACACCACTA AAGCCTTACC TTTTAAGAAG TTGCATTCAG TGAGTGTGTG AGACATAGCA 360 CAGATAGGGG CAGAGGAGAG CTGGTTCTGT CTCCACTGTG TTTGGTCTTG GGTACTGAAC 420 TCAGACCATC AGGTGTGATA GCAGTTGTCT TTAACCCTAA CCCTGAGCCT GTCTCACCTG 480 TCCCTTCCCA AGACCACTGA AGCTAGGTGC AAGATAAGTG GGGACCCTTT CTGAGGTGGT 540 AGGATCTTTC ACGATAAGGA CTATTTTGAA GGGAGGGAGG GTGACACTGT CCTAGTCCTC 600 TTACCCTAGT GTCTCCAGCC TTGCCAGGCC TTAAACATCC GCCCATTGTC ACCGCTCTAG 660 AAGGGGCCAG GGTTGACTTG CTGCTAAACA AGGCACTCCC TAGAGAAGCA CCCGCTAGAA 720 GCATACCATA CCTGTGGGCA GGATGACCCA TGTTCTGCCA CGCACTTGGT AGCCTTGGAA 780 AGGCCACTTT GAACCTCAAT TTTCTCAACT GTTAAATGGG GTGGTAACTG CTATCTCATA 840 ATAAAGGGGA ACGTGAAAGG AAGGCGTTTG CATAGTGCCT GGTTGTGCAG CCAGGCTGCA 900 GTCAAGACTA GTTCCCACCA ACTCGATTTT AAAGCCTTGC AAGAAGGTGG CTTGTTTGTC 960 CCTTGCAGGT TCCTTTGTCG GGCCAAACTC TAGAATGCCT CCCCCTTTCT TTCTCATTGA 1020 AGAGCAGACC CAAGTCCGGG TAACAAGGAA GGGTTTCAGG GTCCTGCCCA TAAAAGGTTT 1080 TTCCCGGCCG CCCTCAGCAC CGCCCCGCCC CGACCCCCGC AGCATCTCCA AAGCATGCAG 1140 AGAATGTCTC CGGCTGCCCC CGACAGACTG CTCCAACTTG GTGTCTTTCC CCAAATATGG 1200 AGCCTGTGTG GAGTGAGTGG GGCGGCCCGG GGTGGTGAGC CAAGCAGACT TCCATGGGCA 1260 GGGAGGGGCG CCAGCGGACG GCAGAGGGGT GACATCACTG CCTAGGCGGC CTTTAAACCC 1320 CTCACCCAGC CGGCGCCCCA GCCCGTCTGC CCCAGCCCAG ACACCGAAGC TACTCTCCTT 1380 CCAGTCCACA AACGACCAAG CCTTGTAAGT GCAAGTCAT 1419 (2) INFORMATION FOR SEQ ID NO : 2: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 991 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS : single (D) TOPOLOGY: linear (ix) FEATURE: (A) NAME/KEY: CDS (B) LOCATION: 38..218 (ix) FEATURE: (A) NAME/KEY: CDS (B) LOCATION : 322..500 (ix) FEATURE: (A) NAME/KEY: CDS (B) LOCATION: 866..967 (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 2 CTTTTCTCCA CACTCTATAC TTTAGCTCTG CCTCAAC ATG GCC AAC AAG GGT CCA 55 Met Ala Asn Lys Gly Pro 1 5 TCC TAC GGC ATG AGC CGA GAA GTG CAG TCC AAA ATT GAG AAG AAG TAT 103 Ser Tyr Gly Met Ser Arg Glu Val Gin Ser Lys He Glu Lys Lys Tyr 10 15 20 GAC GAG GAG CTG GAG GAG CGA CTA GTG GAG TGG ATT GTA GTG CAG TGT 151 Asp Glu Glu Leu Glu Glu Arg Leu Val Glu Trp He Val Val Gin Cys 25 30 35 GGC CCT GAT GTA GGC CGC CCA GAT CGT GGG CGC CTG GGC TTC CAG GTG 199 Gly Pro Asp Val Gly Arg Pro Asp Arg Gly Arg Leu Gly Phe Gin Val 40 45 50 TGG CTG AAG AAT GGT GTG G TGAGTAACCC TTGCGAAGGG AATCTAGGGA 248 Trp Leu Lys Asn Gly Val 55 60 TGTGTATGCC GCCCTACAAA CTGTGAGACA GACTCCCTGA GCTGAGTGTT CAGTTGTGTT 308 CTGTACCTGG CAG ATT CTG AGC AAA TTG GTG AAC AGC CTG TAT CCT GAG 357 He Leu Ser Lys Leu Val Asn Ser Leu Tyr Pro Glu 1 5 10 GGA TCG AAG CCA GTG AAG GTG CCT GAG AAC CCA CCC TCC ATG GTC TTT 405 Gly Ser Lys Pro Val Lys Val Pro Glu Asn Pro Pro Ser Met Val Phe 15 20 25 AAG CAG ATG GAA CAG GTG GCT CAA TTC TTG AAG GCA GCT GAA GAT TAT 453 Lys Gin Met Glu Gin Val Ala Gin Phe Leu Lys Ala Ala Glu Asp Tyr 30 35 40 GGA GTC ATC AAG ACT GAC ATG TTC CAG ACT GTT GAC CTC TAT GAA GG 500 Gly Val He Lys Thr Asp Met Phe Gin Thr Val Asp Leu Tyr Glu 45 50 55 TATAAGGAAA AAAGGGCTGG AGCCAGTGGG CGAGTGGAGA GCAAGATTAT CAGTCAAGGA 560 GAAGGAATAT CAAAAGCCAC AACCAGCTCT GTTGATGTGT TCATAGCAGG AATGGGATAT 620 GCCAAGAGAA CACATAGCAA GGGGACCAGC TTGGTGGTAC AGCATTTCCT TCTGGGTACA 680 AGGGCCTGTT TTGGATCCTA GAATATCAAA TATATACCAC ACCATACTCA CTAGGGTTTA 740 GAATATGGTC TCTTGAACCC TCTTGATTTG GTGCCACTTG CTCCTTGGTT GGACCATTTT 800 TGAAGCTGGG CAGGTATTGC CTATATGGTC CTGAAATTAG CTCCCTGGCC ACTCTTCTCA 860 TAGGT AAG GAT ATG GCA GCA GTG CAG AGG ACT CTA ATG GCT TTG GGC 907 Lys Asp Met Ala Ala Val Gin Arg Thr Leu Met Ala Leu Gly 1 5 10 AGT TTG GCT GTG ACC AAA AAC GAT GGA AAC TAC CGT GGA GAT CCC AAC 955 Ser Leu Ala Val Thr Lys Asn Asp Gly Asn Tyr Arg Gly Asp Pro Asn 15 20 25 30 TGG TTT ATG AAG TATGTGTCCA CTGGGTCTCT CTGT 991 Trp Phe Met Lys (2) INFORMATION FOR SEQ ID NO : 3: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 60 ammo acids (B) TYPE: ammo acid (D) TOPOLOGY: linear (li) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO - 3 Met Ala Asn Lys Gly Pro Ser Tyr Gly Met Ser Arg Glu Val Gin Ser 1 5 10 15 Lys He Glu Lys Lys Tyr Asp Glu Glu Leu Glu Glu Arg Leu Val Glu 20 25 30 Trp He Val Val Gin Cys Gly Pro Asp Val Gly Arg Pro Asp Arg Gly 35 40 45 Arg Leu Gly Phe Gin Val Trp Leu Lys Asn Gly Val 50 55 60 (2) INFORMATION FOR SEQ ID NO : 4: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 59 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO : 4: He Leu Ser Lys Leu Val Asn Ser Leu Tyr Pro Glu Gly Ser Lys Pro 1 5 10 15 Val Lys Val Pro Glu Asn Pro Pro Ser Met Val Phe Lys Gin Met Glu 20 25 30 Gin Val Ala Gin Phe Leu Lys Ala Ala Glu Asp Tyr Gly Val He Lys 35 40 45 Thr Asp Met Phe Gin Thr Val Asp Leu Tyr Glu 50 55 (2) INFORMATION FOR SEQ ID NO : 5 (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 34 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO : 5: Lys Asp Met Ala Ala Val Gin Arg Thr Leu Met Ala Leu Gly Ser Leu 1 5 10 15 Ala Val Thr Lys Asn Asp Gly Asn Tyr Arg Gly Asp Pro Asn Trp Phe 20 25 30 Met Lys (2) INFORMATION FOR SEQ ID NO : 6: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 575 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS : single (D) TOPOLOGY: linear (ιx) FEATURE (A) NAME/KEY CDS (B) LOCATION 28 169 (xi) SEQUENCE DESCRIPTION SEQ ID NO 6 ACTTACCCTG GTTCCTTTTC TTCTAGG AAA GCC CAG GAG CAT AAG AGG GAC 51 Lys Ala Gin Glu H s Lys Arg Asp 1 5 TTC ACA GAC AGC CAA CTG CAG GAG GGG AAG CAC GTC ATT GGC CTT CAA 99 Phe Thr Asp Ser Gin Leu Gin Glu Gly Lys H s Val He Gly Leu Gin 10 15 20 ATG GGC AGC AAC AGA GGA GCC TCG CAG GCT GGC ATG ACA GGC TAT GGG 147 Met Gly Ser Asn Arg Gly Ala Ser Gin Ala Gly Met Thr Gly Tyr Gly 25 30 35 40 CGA CCC CGG CAG ATC ATC AGT T AGAAAGGGAA GGCCAGCCCT GAGCTGCAGC 199 Arg Pro Arg Gin He He Ser 45 ATCCTGCTTA GCCTGCCTCA CAAATGCCTA TGTAGGTTCT TAGCCCTGAC AGCTCTGAGG 259 TGTCACTGGG CAAAGATGAC TGCACATGGG CAGCTCCCAC CTATCCTTAG CCTCAGCCCA 319 GCATCTTACC CCAGAGCCAC CACTGCCCTG GCCCCTGTTC CCAGCTGTAC CCCCACCTCT 379 ACTGTTCCTC TCATCCTGGA GTAAGCAGGG AGAAGTGGGC TGGGGTAGCT GGCTGTAGGC 439 CAGCCCACTG TCCTTGATAT CGAATGTCCT TTGAAGGAGA CCCAGCCCAG CCTCTACATC 499 TTTTCCTGGA ATATGTTTTT GGGTTGAAAT TCAAAAAGGA AAAAAGAAAA ATATATAAAT 559 ATATATATAT AT TAC 575 (2) INFORMATION FOR SEQ ID NO : 7- (l) SEQUENCE CHARACTERISTICS (A) LENGTH 47 ammo acids (D) TOPOLOGY linear (ll) MOLECULE TYPE protein (x ) SEQUENCE DESCRIPTION. SEQ ID NO 7 Lys Ala Gin Glu His Lys Arg Asp Phe Thr Asp Ser Gin Leu Gin Glu 1 5 10 15 Gly Lys His Val He Gly Leu Gin Met Gly Ser Asn Arg Gly Ala Ser 20 25 30 Gln Ala Gly Met Thr Gly Tyr Gly Arg Pro Arg Gin He He Ser 35 40 45 ( 2 ) INFORMATION FOR SEQ ID NO : 8 : (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 1102 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS : single (D) TOPOLOGY: linear (ix) FEATURE: (A) NAME/KEY: CDS (B) LOCATION: 77..681 (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 8: GCCCGTCTGC CCCAGCCCAG ACACCGAAGC TACTCTCCTT CCAGTCCACA AACGACCAAG 60 CCTTCTCTGC CTCAAC ATG GCC AAC AAG GGT CCA TCC TAC GGC ATG AGC 109 Met Ala Asn Lys Gly Pro Ser Tyr Gly Met Ser 1 5 10 CGA GAA GTG CAG TCC AAA ATT GAG AAG AAG TAT GAC GAG GAG CTG GAG 157 Arg Glu Val Gin Ser Lys He Glu Lys Lys Tyr Asp Glu Glu Leu Glu 15 20 25 GAG CGA CTA GTG GAG TGG ATT GTA GTG CAG TGT GGC CCT GAT GTA GGC 205 Glu Arg Leu Val Glu Trp He Val Val Gin Cys Gly Pro Asp Val Gly 30 35 40 CGC CCA GAT CGT GGG CGC CTG GGC TTC CAG GTG TGG CTG AAG AAT GGT 253 Arg Pro Asp Arg Gly Arg Leu Gly Phe Gin Val Trp Leu Lys Asn Gly 45 50 55 GTG ATT CTG AGC AAA TTG GTG AAC AGC CTG TAT CCT GAG GGA TCG AAG 301 Val He Leu Ser Lys Leu Val Asn Ser Leu Tyr Pro Glu Gly Ser Lys 60 65 70 75 CCA GTG AAG GTG CCT GAG AAC CCA CCC TCC ATG GTC TTT AAG CAG ATG 349 Pro Val Lys Val Pro Glu Asn Pro Pro Ser Met Val Phe Lys Gin Met 80 85 90 GAA CAG GTG GCT CAA TTC TTG AAG GCA GCT GAA GAT TAT GGA GTC ATC 397 Glu Gin Val Ala Gin Phe Leu Lys Ala Ala Glu Asp Tyr Gly Val He 95 100 105 AAG ACT GAC ATG TTC CAG ACT GTT GAC CTC TAT GAA GGT AAG GAT ATG 445 Lys Thr Asp Met Phe Gin Thr Val Asp Leu Tyr Glu Gly Lys Asp Met 110 115 120 GCA GCA GTG CAG AGG ACT CTA ATG GCT TTG GGC AGT TTG GCT GTG ACC 493 Ala Ala Val Gin Arg Thr Leu Met Ala Leu Gly Ser Leu Ala Val Thr 125 130 135 AAA AAC GAT GGA AAC TAC CGT GGA GAT CCC AAC TGG TTT ATG AAG AAA 541 Lys Asn Asp Gly Asn Tyr Arg Gly Asp Pro Asn Trp Phe Met Lys Lys 140 145 150 155 GCC CAG GAG CAT AAG AGG GAC TTC ACA GAC AGC CAA CTG CAG GAG GGG 589 Ala Gin Glu His Lys Arg Asp Phe Thr Asp Ser Gin Leu Gin Glu Gly 160 165 170 AAG CAC GTC ATT GGC CTT CAA ATG GGC AGC AAC AGA GGA GCC TCG CAG 637 Lys His Val He Gly Leu Gin Met Gly Ser Asn Arg Gly Ala Ser Gin 175 180 185 GCT GGC ATG ACA GGC TAT GGG CGA CCC CGG CAG ATC ATC AGT TA 681 Ala Gly Met Thr Gly Tyr Gly Arg Pro Arg Gin He He Ser 190 195 200 GAAAGGGAAG GCCAGCCCTG AGCTGCAGCA TCCTGCTTAG CCTGCCTCAC AAATGCCTAT 741 GTAGGTTCTT AGCCCTGACA GCTCTGAGGT GTCACTGGGC AAAGATGACT GCACATGGGC 801 AGCTCCCACC TATCCTTAGC CTCAGCCCAG CATCTTACCC CAGAGCCACC ACTGCCCTGG 861 CCCCTGTTCC CAGCTGTACC CCCACCTCTA CTGTTCCTCT CATCCTGGAG TAAGCAGGGA 921 GAAGTGGGCT GGGGTAGCTG GCTGTAGGCC AGCCCACTGT CCTTGATATC GAATGTCCTT 981 TGAAGGAGAC CCAGCCCAGC CTCTACATCT TTTCCTGGAA TATGTTTTTG GGTTGAAATT 1041 CAAAAAGGAA AAAAGAAAAA TATATAAATA TATATATATA CAAAAAAAAA AAAAAAAAAA 1101 A 1102 (2) INFORMATION FOR SEQ ID NO : 9: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 201 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO : 9: Met Ala Asn Lys Gly Pro Ser Tyr Gly Met Ser Arg Glu Val Gin Ser 1 5 10 15 Lys He Glu Lys Lys Tyr Asp Glu Glu Leu Glu Glu Arg Leu Val Glu 20 25 30 Trp He Val Val Gin Cys Gly Pro Asp Val Gly Arg Pro Asp Arg Gly 35 40 45 Arg Leu Gly Phe Gin Val Trp Leu Lys Asn Gly Val He Leu Ser Lys 50 55 60 Leu Val Asn Ser Leu Tyr Pro Glu Gly Ser Lys Pro Val Lys Val Pro 65 70 75 80 Glu Asn Pro Pro Ser Met Val Phe Lys Gin Met Glu Gin Val Ala Gin 85 90 95 Phe Leu Lys Ala Ala Glu Asp Tyr Gly Val He Lys Thr Asp Met Phe 100 105 110 Gin Thr Val Asp Leu Tyr Glu Gly Lys Asp Met Ala Ala Val Gin Arg 115 120 125 Thr Leu Met Ala Leu Gly Ser Leu Ala Val Thr Lys Asn Asp Gly Asn 130 135 140 Tyr Arg Gly Asp Pro Asn Trp Phe Met Lys Lys Ala Gin Glu His Lys 145 150 155 160 Arg Asp Phe Thr Asp Ser Gin Leu Gin Glu Gly Lys His Val He Gly 165 170 175 Leu Gin Met Gly Ser Asn Arg Gly Ala Ser Gin Ala Gly Met Thr Gly 180 185 190 Tyr Gly Arg Pro Arg Gin He He Ser 195 200 (2) INFORMATION FOR SEQ ID NO : 10: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 43 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS : single (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 10: ATCGAATTCC GCTACTCTCC TTCCAGCCCA CAAACGACCA AGC 43 (2) INFORMATION FOR SEQ ID NO 11 (l) SEQUENCE CHARACTERISTICS (A) LENGTH 33 base pairs (B) TYPE nucleic acid (C) STRANDEDNESS single (D) TOPOLOGY linear (xi) SEQUENCE DESCRIPTION SEQ ID NO 11 ATCAAGCTTG GTGGGAGCTG CCCATGTGCA GTC 33 (2) INFORMATION FOR SEQ ID NO 12 (l) SEQUENCE CHARACTERISTICS (A) LENGTH 25 base pairs (B) TYPE nucleic acid (C) STRANDEDNESS single (D) TOPOLOGY linear (xi) SEQUENCE DESCRIPTION SEQ ID NO 12 TGCCGTAGGA TGGACCCTTG TTGGC 25 (2) INFORMATION FOR SEQ ID NO 13 (l) SEQUENCE CHARACTERISTICS (A) LENGTH 10 base pairs (B TYPE nucleic acid (C) STRANDEDNESS single (D) TOPOLOGY linear (ix) FEATURE (A) NAME/KEY modifιed_base (B) LOCATION 1 (D) OTHER INFORMATION /mod_base= OTHER /note= "Y = C or T/U" (ix) FEATURE (A) NAME/KEY modifιed__base (B) LOCATION 4 (D) OTHER INFORMATION /mod_base= OTHER /note= "W = A or T/U" (ix) FEATURE (A) NAME/KEY modifled_base (B) LOCATION 10 (D) OTHER INFORMATION /mod_base= OTHER /note= ' R = A or G" (xi) SEQUENCE DESCRIPTION: SEQ ID NO. 13: YTAWAAATAR 10 (2) INFORMATION FOR SEQ ID NO: 14. (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 10 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: Single (D) TOPOLOGY: linear (χι) SEQUENCE DESCRIPTION: SEQ ID NO: 14- TTTAAAATCG 10 (2) INFORMATION FOR SEQ ID NO : 15: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 10 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 15- TTCAAAATAG 10 (2) INFORMATION FOR SEQ ID NO: 16 (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 8 ammo acids (B) TYPE: ammo acid (C) STRANDEDNESS: (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 16 Cys Cys Cys Met Asn Ser Ser Ser 1 5 (2) INFORMATION FOR SEQ ID NO : 17: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 9 ammo acids (C) STRANDEDNESS- (D) TOPOLOGY linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO • 17 Lys Arg Gly Gly Cys Lys Arg Arg Lys 1 5 (2) INFORMATION FOR SEQ ID NO: 18: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 9 ammo acids (C) STRANDEDNESS: (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 18 Thr Lys Asn Asn Gly Asn Ala Ala Lys 1 5 (2) INFORMATION FOR SEQ ID NO: 19: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 8 ammo acids (C) STRANDEDNESS: (D) TOPOLOGY: linear ( i) SEQUENCE DESCRIPTION: SEQ ID NO : 19: Met He Arg He Cys Arg Lys Lys 1 5 (2) INFORMATION FOR SEQ ID NO : 20: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 381 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO : 20 AGTCAAGACT AGTTCCCACC AACTCGATTT TAAAGCCTTG CAAGAAGGTG GCTTGTTTGT 60 CCCTTGCAGG TTCCTTTGTC GGGCCAAACT CTAGAATGCC TCCCCCTTTC TTTCTCATTG 120 AAGAGCAGAC CCAAGTCCGG GTAACAAGGA AGGGTTTCAG GGTCCTGCCC ATAAAAGGTT 180 TTTCCCGGCC GCCCTCAGCA CCGCCCCGCC CCGACCCCCG CAGCATCTCC AAAGCATGCA 240 GAGAATGTCT CCGGCTGCCC CCGACAGACT GCTCCAACTT GGTGTCTTTC CCCAAATATG 300 GAGCCTGTGT GGAGTGAGTG GGGCGGCCCG GGGTGGTGAG CCAAGCAGAC TTCCATGGGC 360 AGGGAGGGGC GCCAGCGGAC G 381 (2) INFORMATION FOR SEQ ID NO 21 (l) SEQUENCE CHARACTERISTICS (A) LENGTH 47 base pairs (B) TYPE nucleic acid (C) STRANDEDNESS single (D) TOPOLOGY linear (xi) SEQUENCE DESCRIPTION SEQ ID NO 21 AAGGAAGGGT TTCAGGGTCC TGCCCATAAA AGGTTTTTCC CGGCCGC 47 (2) INFORMATION FOR SEQ ID NO 22 (l) SEQUENCE CHARACTERISTICS (A) LENGTH 47 base pairs (B) TYPE nucleic acid (C) STRANDEDNESS single (D) TOPOLOGY linear (xi) SEQUENCE DESCRIPTION SEQ ID NO 22 AAGGAAGGGT TTCAGGGTCC TGCCCATAGA TCTTTTTTCC CGGCCGC 47 (2) INFORMATION FOR SEQ ID NO 23 (l) SEQUENCE CHARACTERISTICS (A) LENGTH 43 base pairs (B) TYPE nucleic acid (C) STRANDEDNESS single (D) TOPOLOGY linear (xi) SEQUENCE DESCRIPTION SEQ ID NO 23 CCGCCCTCAG CACCGCCCCG CCCCGAGGCC CGCAGCATGT CCG 43 (2) INFORMATION FOR SEQ ID NO 24 (l) SEQUENCE CHARACTERISTICS (A) LENGTH 43 base pairs (B) TYPE nucleic acid (C) STRANDEDNESS single (D) TOPOLOGY linear (xi) SEQUENCE DESCRIPTION SEQ ID NO 24 CCGCCCTCAG CACCGCGGAT CCCCGACCCC CGCAGCATCT CCG 43 (2) INFORMATION FOR SEQ ID NO 25 (l) SEQUENCE CHARACTERISTICS (A) LENGTH 37 base pairs (B) TYPE nucleic acid (C) STRANDEDNESS single (D) TOPOLOGY linear (xi) SEQUENCE DESCRIPTION SEQ ID NO 25 CTCCAAAGCA TGCAGAGAAT GTCTCCGGCT GCCCCCG 37 (2) INFORMATION FOR SEQ ID NO 26 (l) SEQUENCE CHARACTERISTICS (A) LENGTH 37 base pairs (B) TYPE nucleic acid (C) STRANDEDNESS single (D) TOPOLOGY linear (xi) SEQUENCE DESCRIPTION SEQ ID NO 26 CTCGGATCCA TGCTAGCAAT GAATTCGGCT GCCCCCG 37 (2) INFORMATION FOR SEQ ID NO 27 (l) SEQUENCE CHARACTERISTICS (A) LENGTH 44 base pairs (B) TYPE nucleic acid (C) STRANDEDNESS single (D) TOPOLOGY linear (xi) SEQUENCE DESCRIPTION SEQ ID NO 27 TCCAACTTGG TGTCTTTCCC CAAATATGGA GCCTGTGTGG AGTG 44 (2) INFORMATION FOR SEQ ID NO 28 (l) SEQUENCE CHARACTERISTICS (A) LENGTH 44 base pairs (B) TYPE nucleic acid (C) STRANDEDNESS single (D) TOPOLOGY linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO : 28 TCCAACTTGG TGTCTTTCCC CAAGGATCCA GCCTGTGTGG AGTG 44 (2) INFORMATION FOR SEQ ID NO : 29: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 44 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS. single (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO : 29: TCCAACTTGG TGTCTTTCCC CGGATATGGA GCCTGTGTGG AGTG 44 (2) INFORMATION FOR SEQ ID NO : 30: ( ) SEQUENCE CHARACTERISTICS: (A) LENGTH: 44 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO : 30: TCCAACTTGG TGTCTTTCCC CAAATTAGGA GCCTGTGTGG AGTG 44 (2) INFORMATION FOR SEQ ID NO : 31: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 21 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: Single (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO : 31: GGGCAGGGAG GGGCGCCAGC G 21 (2) INFORMATION FOR SEQ ID NO: 32: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 21 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS single (D) TOPOLOGY linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 32- GGGCAGGTAC CGAATTCAGC G 21 (2) INFORMATION FOR SEQ ID NO : 33: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 37 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 33: GGACGGCAGA GGGGTGACAT CACTGCCTAG GCGGCCG 37 (2) INFORMATION FOR SEQ ID NO : 34: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 37 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 34: GGACGGCAGA GGGGATCCAT GCCTGCCTAG GCGGCCG 37 (2) INFORMATION FOR SEQ ID NO : 35: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 37 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 35: GGACGGCAGA GGGGATCCAT CACTGCCTAG GCGGCCG 37 (2) INFORMATION FOR SEQ ID NO : 36: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 29 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO : 36 CTGGCTAAAG GGGCGGGGCT TGGCCAGCC 29 (2) INFORMATION FOR SEQ ID NO : 37: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 26 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO : 37: CTCCCATTTC CATGACGTCA TGGTTA 26 (2) INFORMATION FOR SEQ ID NO : 38: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 47 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO : 38: AAGGAAGGGT TTCAGGGTCC TGCCCATAGA TCTTTTTTCC CGGCCGC 47 (2) INFORMATION FOR SEQ ID NO : 39: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 43 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO : 39: CCGCCCTCAG CACCGCGGAT CCCCGACCCC CGCAGCATCT CCG 43 (2) INFORMATION FOR SEQ ID NO : 40: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 37 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION SEQ ID NO 40 CTCGGATCCA TGCTAGCAAT GAATTCGGCT GCCCCCG 37 (2) INFORMATION FOR SEQ ID NO 41 (l) SEQUENCE CHARACTERISTICS (A) LENGTH 44 base pairs (B) TYPE nucleic acid (C) STRANDEDNESS single (D) TOPOLOGY linear (xi) SEQUENCE DESCRIPTION SEQ ID NO 41 TCCAACTTGG TGTCTTTCCC CAAGGATCCA GCCTGTGTGG AGTG 44 (2) INFORMATION FOR SEQ ID NO 42 (l) SEQUENCE CHARACTERISTICS (A) LENGTH 44 base pairs (B) TYPE nucleic acid (C) STRANDEDNESS single (D) TOPOLOGY linear (xi) SEQUENCE DESCRIPTION SEQ ID NO 42 TCCAACTTGG TGTCTTTCCC CGGATATGGA GCCTGTGTGG AGTG 44 (2) INFORMATION FOR SEQ ID NO 43 (l) SEQUENCE CHARACTERISTICS (A) LENGTH 44 base pairs (B) TYPE nucleic acid (C) STRANDEDNESS single (D) TOPOLOGY linear (xi) SEQUENCE DESCRIPTION SEQ ID NO 43 TCCAACTTGG TGTCTTTCCC CAAATTAGGA GCCTGTGTGG AGTG 44 (2) INFORMATION FOR SEQ ID NO 44 (l) SEQUENCE CHARACTERISTICS (A) LENGTH 21 base pairs (B) TYPE nucleic acid (C) STRANDEDNESS single (D) TOPOLOGY linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 44: GGGCAGGTAC CGAATTCAGC G 21 (2) INFORMATION FOR SEQ ID NO : 45: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 37 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY- linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 45: GGACGGCAGA GGGGATCCAT GCCTGCCTAG GCGGCCG 37 (2) INFORMATION FOR SEQ ID NO: 46: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 37 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 46: GGACGGCAGA GGGGATCCAT CACTGCCTAG GCGGCCG 37 (2) INFORMATION FOR SEQ ID NO : 47: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 10 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: Single (D) TOPOLOGY: linear (ix) FEATURE: (A) NAME/KEY: modifιed_base (B) LOCATIONS ..8 (D) OTHER INFORMATION :/mod_base= OTHER /note= " = A or T" (xi) SEQUENCE DESCRIPTION. SEQ ID NO : 47: CC W CC 10 (2) INFORMATION FOR SEQ ID NO: 48- (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 45 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO- 48: CTCCAACTTG GTGTCTTTCC CCGGATATGG AGCCTGTGTG GAGTG 45 (2) INFORMATION FOR SEQ ID NO : 49: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 45 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO : 49: CTCCAACTTG GTGTCTTTCC CCAAATTAGG AGCCTGTGTG GAGTG 45 (2) INFORMATION FOR SEQ ID NO: 50: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 10 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS single (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 50: CCAAATATGG 10 (2) INFORMATION FOR SEQ ID NO : 51: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 10 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS. single (D) TOPOLOGY- linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 51: CCATATATGG 10

Claims: CLAIMS 1. An isolated nucleic acid segment comprising an SM22α promoter, wherein said promoter is a segment of about 5,000 bases immediately upstream of the transcriptional start site of the murine SM22α genome and wherein said promoter is operatively linked to a heterologous nucleic acid sequence. 2. An isolated nucleic acid segment of claim 1 , further defined as comprising a nucleic acid segment having a sequence according to bases 899-1382 of SEQ ID NO: l , or being hybridizable to the complement of bases 899-1382 of SEQ ID NO: l under high stringency conditions, and effective to promote transcription of a heterologous gene in a smooth muscle cell. 3. The isolated nucleic acid segment of claim 1 , wherein said promoter sequence is further defined as comprising a contiguous sequence of bases 899-1382 of SEQ ID NO:l . 4. The isolated nucleic acid segment of claim 1 , wherein said promoter sequence is further defined as comprising a contiguous sequence of bases 1-1382 of SEQ ID NO:l. 5. The isolated nucleic acid segment of claim 1 , wherein said promoter sequence is further defined as comprising a contiguous sequence of bases 1060- 1382 of SEQ ID NO: 1. 6. The nucleic acid segment of claim 1 , wherein said heterologous nucleic acid sequence encodes a cell cycle control gene, an angiogenesis gene or a cytotoxic gene. 7. The nucleic acid segment of claim 6, wherein said cell cycle control gene is selected from the group consisting of Rb. a phosphorylation deficient Rb gene. p53, p21, pl6, p27, a cell cycle dependent kinase inhibitor, E2F inhibitor, a CDK kinase or a cyclin gene. 8. The nucleic acid segment of claim 6, wherein said cell cycle control gene is a phosphorylation deficient Rb gene, p53, p21 or pl6. 9. The nucleic acid segment of claim 6, wherein said angiogenesis gene is VEGF, iNOS. eNOS, basic FGF or FGF-5. 10. The nucleic acid segment of claim 6, wherein said angiogenesis gene is VEGF, iNOS or eNOS. 1 1. The nucleic acid segment of claim 6, wherein said cytotoxic gene is a herpes simplex thymidine kinase gene. 12. The nucleic acid segment of claim 6, wherein said heterologous nucleic acid sequence encodes an antisense RNA effective to inhibit expression of a cell cycle control gene. 13. A recombinant vector comprising the isolated nucleic acid segment of claim 1. 14. The recombinant vector of claim 13, further defined as a plasmid. 15. The recombinant vector of claim 13, further defined as a viral vector. 16. The recombinant vector of claim 15, wherein said viral vector is a bacteriophage vector. a raus sarcoma virus vector, a p21 virus vector an adeno-associated virus vector or an adenoviral vector. 17. The recombinant vector of claim 16, wherein said vector is a replication defective adenovirus vector. 18. The recombinant vector of claim 13, dispersed in a pharmaceutically acceptable solution. 19. A host cell wherein said cell contains the nucleic acid segment of claim 1. 20. The host cell of claim 19, wherein said nucleic acid segment is contained in a vector. 21. The host cell of claim 19, wherein said host cell is a smooth muscle cell. 22. The host cell of claim 21 , wherein said cell is an A7r5 cell. 23. A replication deficient adenoviral vector, wherein said vector comprises a smooth muscle cell specific transcriptional regulatory segment. 24. The vector of claim 23, wherein said smooth muscle cell specific transcriptional regulatory segment is an SM22α promoter, a smooth muscle calponin promoter, a smooth muscle myosin heavy chain promoter, a smooth muscle alpha actin promoter, a smooth muscle alpha actin enhancer, a telokin promoter, a smooth muscle gamma-actin promoter or a smooth muscle gamma-actin enhancer. 25. The vector of claim 23, wherein said vector comprises an SM22α promoter segment operatively linked to a heterologous gene. 26. The vector of claim 25. wherein said heterologous gene encodes a a cell cycle control gene, an angiogenesis gene or a cytotoxic gene. 27. The vector of claim 26, wherein said cell cycle control gene is selected from the group consisting of Rb, a phosphorylation deficient Rb gene, p53. p21 , plό, p27, a cell cycle dependent kinase inhibitor. E2F inhibitor, a CDK kinase or a cyclin gene. 28. The vector of claim 26. wherein said cell cycle control gene is a phosphorylation deficient Rb gene, p53, p21 or plό. 29. The vector of claim 26, wherein said angiogenesis gene is VEGF, iNOS, eNOS, basic FGF or FGF-5. 30. The vector of claim 26, wherein said angiogenesis gene is VEGF, iNOS or eNOS. 31. The vector of claim 26, wherein said cytotoxic gene is a herpes simplex thymidine kinase gene. 32. The vector of claim 26, wherein said heterologous nucleic acid sequence encodes an antisense RNA effective to inhibit expression of a cell cycle control gene. 33. The vector of claim 23, wherein said vector is dispersed in a pharmacolgically acceptable solution. 34. A method of expressing a heterologous gene in a smooth muscle cell comprising the steps of: (a) obtaining a nucleic acid segment comprising a murine SM22α promoter region operatively linked to a heterologous gene, wherein said nucleic acid is contained in an adenoviral vector; (b) infecting said smooth muscle cell with said adenoviral vector; and (c) culturing said smooth muscle cell under conditions effective to express said gene. 35. The method of claim 34, wherein said SM22α promoter comprises bases 899-1382 of SEQ ID NO: 1. 36. The method of claim 34, wherein said heterologous gene is a reporter gene. 37. The method of claim 34. wherein said gene is a cell cycle control regulatory gene. 38. The method of claim 34, wherein said adenoviral vector is a replication deficient adenoviral vector. 39. The method of claim 38, wherein said cell is in an animal and said vector is administered to said animal in a pharmacologically acceptable solution. 40. A method of inhibiting smooth muscle cell proliferation comprising the steps of: (a) obtaining an isolated nucleic acid segment comprising a cell cycle regulatory gene operatively linked to an SM22α promoter region; (b) transferring said nucleic acid segment into a smooth muscle cell; and (c) maintaining said smooth muscle cell under conditions effective to express said cell cycle regulatory gene; wherein expression of said cell cycle regulatory gene inhibits proliferation of said smooth muscle cell. 41. The method of claim 40, wherein said smooth muscle cell is in an animal. 42. The method of claim 40, wherein said cell cycle regulatory gene operatively linked to an SM22α promoter region comprises a viral or plasmid vector. 43. The method of claim 42, wherein said viral vector is an adenoviral vector. 44. The method of claim 40, wherein said cell cycle regulatory gene is selected from the group consisting of Rb, a phosphorylation deficient Rb gene, p53, p21, pl6, p27. a cell cycle dependent kinase inhibitor, E2F inhibitor, a CDK kinase or a cyclin gene. 45. A method of preventing restenosis in a subject following balloon angioplasty, comprising the steps of: (a) obtaining an adenoviral vector comprising a cell cycle regulatory gene operatively linked to an SM22 promoter region dispersed in a pharmaceutically acceptable solution; and (b) administering said solution to said subject. 46. The method of claim 45, wherein said cell cycle regulatory gene encodes a constitutively active Rb gene product. 47. A method of promoting angiogenesis in a subject comprising the steps: (a) obtaining a nucleic acid segment comprising an angiogenesis factor gene operatively linked to an SM22α promoter region; and (b) transferring said nucleic acid segment into a smooth muscle cell to obtain a transfected cell; wherein expression of said nucleic acid segment in said smooth muscle cell promotes angiogenesis. 48. The method of claim 47, wherein said smooth muscle cell is a coronary arterial or venous smooth muscle cell. 49. The method of claim 47, wherein said smooth muscle cell is a peripheral arterial or venous smooth muscle cell. 50. The method of claim 47, wherein said angiogenesis factor is VEGF. 51. The method of claim 47, wherein said nucleic acid segment comprising an angiogenesis factor gene operatively linked to an SM22α promoter region is contained in a viral or plasmid vector and said vector is administered to said subject. 52. The method of claim 38, wherein said transferring is done ex vivo and the method further comprises the steps : (a) seeding a bioprosthetic graft or stent with said transfected cells to obtain a seeded graft or stent; and (b) placing the seeded graft or stent into a coronary or peripheral artery or vein of a subject. 53. A method of inhibiting smooth muscle proliferation comprising the steps of: (a) obtaining a nucleic acid segment comprising a cell cycle regulatory gene operatively linked to an SM22α promoter region; (b) transferring said nucleic acid segment into a primary smooth muscle cell ex vivo to obtain a transfected cell; (c) seeding a bioprosthetic graft or stent with said transfected cell to obtain a seeded graft or stent; and (d) placing the seeded graft or stent into a coronary or peripheral artery or vein of a subject; wherein expression of said cell cycle regulatory gene inhibits proliferation of a smooth muscle cell.

Inventors: PARMACEK MICHAEL S, SOLWAY JULIAN, PARMACEK, MICHAEL, S., SOLWAY, JULIAN
Applicants: ARCH DEV CORP, PARMACEK MICHAEL S, SOLWAY JULIAN, ARCH DEVELOPMENT CORPORATION, PARMACEK, MICHAEL, S., SOLWAY, JULIAN
Application year: 1997
Main classification: C07K14
IPC codes: A61F2, A61K31, A61K35, A61K38, A61K48, A61P9, A61P11, A61P43, C07K14, C12N5, C12N15