DEHYDROGENASE OLIGOMERIC MODULATORS

Abstract: Methods of screening compounds which are oligomeric modulators of dehydrogenases such as glyceraldehyde-3-phosphate dehydrogenase (GAPDH), and such oligomeric modulators. In one aspect, methods are presented for identifying an oligomeric modulator of a dehydrogenase, comprising contacting the dehydrogenase with a compound under conditions which allow oligomerization of the dehydrogenase to occur; and measuring the ability of the compound to modulate oligomerization of the dehydrogenase as an indication of whether the compound is an oligomeric modulator of the dehydrogenase. In another aspect, methods are presented for identifying an oligomeric modulator of GAPDH, comprising contacting GAPDH with a compound under conditions which allow oligomerization of GAPDH to occur; and measuring the ability of the compound to modulate oligomerization of GAPDH as an indication of whether the compound is an oligomeric modulator of GAPDH. In another aspect, methods are presented for identifying antiapoptotic agents, comprising contacting GAPDH with a compound under conditions which allow oligomerization of GAPDH to occur; and measuring the ability of the compound to modulate oligomerization of GAPDH as an indication of whether the compound is an antiapoptotic agent.

Description: DEHYDROGENASE OLIGOMERIC MODULATORS Background of the Invention The progressive death of catecholaminergic neurons is central to the neurological deficits in Parkinson's disease (PD). Symptomatic therapy reduces PD neurological deficits but does not alter the progressive nature of the disease. To date, there is no firm evidence that the progression of PD can be slowed; therefore, the development of agents that slow disease progression is a major priority of PD research. Recent evidence suggests that apoptosis mediates neuronal death in PD. The explosion in the understanding of apoptosis and the application of that knowledge to PD has the potential to lead to interventions that could slow or block neuronal death in the disease. Apoptosis can be initiated in neurons by many different forms of damage and proceeds in a step by step fashion with each step involving signaling by specific proteins. The signaling involves the cleavage, binding and inter-organelle movements of the proteins. The signaling pathways in the early phases of apoptosis depend on the form of damage that initiates the process. Accordingly, specific early pathways can be identified by changes in the levels and/or subcellular locations of specific proteins. The early signaling pathways converge onto a small number of effector signaling pathways that lead to the final degradative steps typical of apoptosis. The dependence of apoptosis on cascades of signaling proteins opens the door to the interruption of the process and thereby to the rescue of damaged neurons. Apoptosis can be disrupted by changing the three dimensional conformation of apoptosis- promoting (pro-apoptotic) proteins, thereby blocking their function, or alternatively, by conformational changes that enhance the function of anti-apoptotic proteins that signal for interruption of specific steps in apoptotic pathways. Apoptosis is a multi-step process that can be separated into three phases: initiation phase, effector phase and a final degradation phase (152). Events in the degradative phase of apoptosis, like nuclear chromatin condensation (NCC) and DNA cleavage, are commonly used to identify neurons in apoptosis. Electron microscopy (EM) of apoptotic cells reveals masses of condensed nuclear chromatin which fractionate into membrane-wrapped, chromatin-dense nuclear bodies. The cytoplasm also condenses with an intact organelle structure and buds into membrane wrapped fragments. These cell fragments are engulfed by macrophages without an inflammatory reaction. Gel electrophoresis generally demonstrates a 180-200 base pair "ladder" of endonuclease-digested DNA in apoptosis, although in some cases 300-500 base pair fragments occur (107, 109). In situ end labeling (ISEL) techniques attach a chromagen or fluorochrome to the cut 3'-OH ends of DNA to mark DNA cleavage (159). The NCC, typical of apoptosis, results from the stripping of proteins from DNA and condensation of the DNA. NCC can be visualized with fluorescent DNA binding dyes like bisbenzimide or YOYO-1 (159). Delineation of a subcellular structure is essential to the recognition of apoptosis so that the demonstration of appropriate changes in nuclear substructure coupled with the joint demonstration of DNA cleavage and NCC in the same nucleus provides irrefutable evidence for apoptotic nuclear degradation. Changes in the expression of specific genes, and/or changes in the levels of their protein products, can serve as markers of different apoptotic pathways and apoptotic phases. The translocation of apoptosis-related proteins, concentrated in a specific subcellular organelle(s), to different organelles/compartments is fundamental to apoptosis signaling and can also serve to identify specific apoptotic pathways and phases. Glyceraldehyde-3 -phosphate dehydrogenase (GAPDH) catalyzes the conversion of glyceraldehyde-3-phosphate to 1,3 -bisphosphogly cerate in the glycolytic pathway and converts NAD + to the high energy carrier NADH. Other functions associated with GAPDH include the control of endocytosis, mRNA regulation, tRNA export, DNA replication, and DNA repair (135). GAPDH binds to the polyglutamine repeats in the abnormal protein in Huntington's disease (20). GAPDH mRNA and protein levels increase during apoptosis of cultured cerebellar neurons (59, 138). Antisense oligonucleotides against GAPDH mRNA decrease cerebellar neuronal apoptosis (59). Koningic acid inhibits GAPDH glycolytic function and induces apoptosis in NG108-15 cells (103). It binds to the Rossman fold of the protein, where NAD + is converted to NADH and where AU-rich RNA binds to GAPDH. Western blots have suggested a shift of GAPDH protein from the cytosolic to the nuclear fraction in cerebellar cells (121), thymocytes, PC 12 cells and cultured cortical neurons entering apoptosis (122). GAPDH upregulation and nuclear translocation appears to occur during the initiation phase or early effector phase in neuronally differentiated PC 12 cells and fibroblasts. GAPDH nuclear translocation has been found in melanin-containing neurons in the PD SNc, and, accordingly, a GAPDH-dependent apoptosis may contribute to dopaminergic cell death in PD. The role of GAPDH in apoptosis has not been completely understood. Summary of the Invention The present invention is based, at least in part, on the discovery that molecules or compounds that interfere with GAPDH's ability to form a tetramer are antiapoptotic agents. The present disclosure relates to methods of screening compounds which are oligomeric modulators of dehydrogenases, e.g., lactate dehydrogenase (LADH) and glyceraldehyde-3 -phosphate dehydrogenase (GAPDH), as well as identifying such dehydrogenase oligomeric modulators (DOMs). In one aspect, methods are presented for identifying an oligomeric modulator of a dehydrogenase. The method involves contacting the dehydrogenase with a compound under conditions which allow oligomerization of the dehydrogenase to occur; and measuring the ability of the compound to modulate oligomerization of the dehydrogenase as an indication of whether the compound is a DOM. In an embodiment, the ability of the compound to modulate oligomerization of the dehydrogenase is its ability to modulate the level of oligomerization of the dehydrogenase. In one aspect, methods are presented for identifying an oligomeric modulator of GAPDH. The method involves contacting GAPDH with a compound under conditions which allow oligomerization of GAPDH to occur; and measuring the ability of the compound to modulate oligomerization of GAPDH as an indication of whether the compound is an oligomeric modulator of GAPDH. In an embodiment, the ability of the compound to modulate oligomerization of GAPDH is its ability to prevent the formation of a tetramer of GAPDH. In a further embodiment, the ability of the compound to modulate oligomerization of GAPDH is its ability to enhance the formation of a dimer of GAPDH. In another aspect, methods are presented for identifying antiapoptotic agents, comprising contacting GAPDH with a compound under conditions which allow oligomerization of GAPDH to occur; and measuring the ability of the compound to modulate oligomerization of GAPDH as an indication of whether the compound is an antiapoptotic agent. In an embodiment, the ability of the compound to modulate oligomerization of GAPDH is its ability to prevent the formation of a tetramer of GAPDH. In a further embodiment, the ability of the compound to modulate oligomerization of GAPDH is its ability to enhance the formation of a dimer of GAPDH. In yet another embodiment, the ability of the compound to modulate oligomerization of GAPDH is its ability bind to GAPDH and thus prevent GAPDH oligomer formation. In another embodiment, methods are disclosed for screening a library of compounds which are oligomeric modulators of dehydrogenases, e.g., lactate dehydrogenase (LADH) and glyceraldehyde-3-phosphate dehydrogenase (GAPDH), as well as identifying such dehydrogenase oligomeric modulators (DOMs). In one aspect, methods are presented for identifying DOMs from a library of compounds. The method involves contacting the dehydrogenase with a sample of a library of compounds under conditions which allow oligomerization of the dehydrogenase to occur; classifying any oligomers formed; and identifying the compounds that modulate oligomerization of the dehydrogenase as an indication of whether the compound(s) is an oligomeric modulator of the dehydrogenase. In an embodiment, the ability of the compound(s) to modulate oligomerization of the dehydrogenase is its ability to prevent the formation of a oligomer of the dehydrogenase. In another embodiment, methods are disclosed for screening a library of compounds for their ability to modulate oligomerization of GAPDH, comprising contacting GAPDH with a sample of a library of compounds under conditions which allow oligomerization of GAPDH to occur; classifying any oligomers formed; and identifying the compounds that modulate oligomerization of GAPDH as an indication of whether the compound is an oligomeric modulator of GAPDH. In an embodiment, the ability of the compound(s) to modulate oligomerization of GAPDH is its ability to prevent the formation of a tetramer of GAPDH. In a further embodiment, the ability of the compound(s) to modulate oligomerization of GAPDH is its ability to enhance the formation of a dimer of GAPDH. In yet another embodiment, the ability of the compound(s) to modulate oligomerization of GAPDH is its ability bind to GAPDH and thus prevent GAPDH oligomer formation. In certain embodiments, the compound to be tested is derived from a library of small molecules. In another embodiment, the ability of the compound to modulate oligomerization of GAPDH is its ability bind to GAPDH and thus prevent GAPDH oligomer formation can be predicted through use of molecular modeling. In another embodiment, the compound is a naturally occurring small organic molecule. In a preferred embodiment, the compound may be, e.g., dibenzo[6,/]oxepin-10-ylmethyl- prop-2-ynyl-amine (CGP3466), or (-)-desmethyldeprenyl. Brief Description of the Drawings FIG. 1 illustrates the binding of an analog of desmethyl deprenyl, CGP 3466, to the tetramer form of GAPDH; FIG. 2 illustrates another view of the binding of CGP 3466 to the tetramer form of GAPDH; and FIG. 3 is size exclusion chromatographic profiles showing the effect of CGP 3466 and (-)-desmethyldeprenylto on the oligomeric state of GAPDH. Detailed Description of the Invention The present disclosure relates to methods of screening compounds which are oligomeric modulators of dehydrogenases, in particular glyceraldehyde-3 -phosphate dehydrogenase (GAPDH), as well as identifying such GAPDH oligomeric modulators. For example, certain compounds that bind to GAPDH that decrease the capacity of GAPDH to form tetramers have been identified. The shift from a tetrameric to a dimeric conformation reduces the proapoptotic capacity of GAPDH, since it is associated with a decrease in some forms of neuronal apoptosis. Before further description of the invention, certain terms employed in the specification, examples and appended claims are, for convenience, collected here. Definitions As used herein the term "compound" includes any reagent which is employed in the methods of the disclosure and assayed for its utility as an oligomeric modulator of a dehydrogenase, e.g., GAPDH, by the ability of the compound to prevent or inhibit the formation of an oligomer of the dehydrogenase, e.g., tetramer of GAPDH. Exemplary compounds which can be screened for activity include, but are not limited to, peptides, non-peptidic compounds, nucleic acids, carbohydrates, small organic molecules, and natural product extract libraries. The term "non-peptidic compound" is intended to encompass compounds that are comprised, at least in part, of molecular structures different from naturally-occurring L-amino acid residues linked by natural peptide bonds. However, "non-peptidic compounds" are intended to include compounds composed, in whole or in part, of peptidomimetic structures, such as D-amino acids, non-naturally-occurring L-amino acids, modified peptide backbones and the like, as well as compounds that are composed, in whole or in part, of molecular structures unrelated to naturally-occurring L-amino acid residues linked by natural peptide bonds. "Non- peptidic compounds" also are intended to include natural products. "Antiapoptotic agent" is intended to include compounds or compositions which ameliorate, modulate or prevent apoptosis. "Apoptosis" is intended to include the process in which catabolic enzymes degrade essential macromolecules leading to a characteristic biochemical and ultra- structural death phenoptype. In apoptosis, cellular fragments are membrane wrapped and are removed by phagocytes without evidence of inflammation, (see also 152, appended hereto and incorporated herein by reference.) In sharp contrast, necrosis involves extrusion of cellular contents which induces a easily detectable inflammatory response. "Dehydrogenase" is intended to include enzymes which catalyze oxidation by the removal of hydrogen, e.g., lactate dehydrogenase (LADH), glyceraldehyde-3-phosphate dehydrogenase (GAPDH), etc. "Dehydrogenase oligomeric modulator" is intended to include those compounds or compositions which prevent, inhibit or interfere with dehydrogenase oligomer formation, e.g., tetramer of GAPDH, wherein "oligomer" preferably refers to more than two, more preferably more than three, and even more preferably more than four, monomeric subunits. Also included are those compounds which enhance or promote the formation of a lower form of the dehydrogenase, e.g., a dimer. "Conditions which allow oligomerization to occur" is intended to include in vivo or in vitro conditions favorable to the formation of the oligomeric form of a dehydrogenase. "Measuring the ability of a compound to modulate oligomerization" is intended to include measuring the ability of a compound to prevent the formation of a dehydrogenase oligomer, e.g., tetramer, and the ability of a compound to enhance or promote the formation of a lower form of the dehydrogenase, e.g., a dimer. "Oligomeric modulation" is intended to include the prevention or inhibition of, or interference with dehydrogenase oligomer, e.g., tetramer, formation. Also included is the enhancement or promotion of the formation of a lower form of the dehydrogenase, e.g., a dimer. GAPDH induces apoptosis in cultured neurons. It has been shown that GAPDH densely translocates to the nucleus early in apoptosis in cultured neurons and preliminary studies have shown GAPDH nuclear translocation in melanin-containing neurons in the PD SNc. Based on studies involving the binding of antiapoptotic agents to GAPDH, it is believed that the tetrameric form of GAPDH is essential to apoptosis induction, and in particular, that conversion of GAPDH from a tetramer to a dimer prevents it from inducing apoptosis. A non-limiting step by step model for GAPDH induction of apoptosis is presented: 1 ) NAD + levels modulate the participation of GAPDH in glycolysis, such that the higher the energy demands of the cell, as signaled by NAD + levels, the greater the amounts of GAPDH available for glycolysis; 2) major stress or toxic exposure will decrease the conversion of NAD + to NADH so that high NAD + levels will increase freed GAPDH; 3) similarly, high levels of superoxide radicals, nitric oxide or peroxynitrite free GAPDH from AU-RNA; 5) freed GAPDH will enter the nucleus and bind to DNA or DNA-associated proteins; 6) the nuclear translocation of GAPDH signals or facilitates apoptosis; 7) the induction by apoptosis by GAPDH requires the protein to be in a tetrameric form; and 8) compounds which may be identified by the methods disclosed herein, such as DES or CGP3466, which tend to maintain GAPDH as a dimer, reduce the induction of apoptosis by GAPDH. Note that this model is not meant to be a limitation on the claimed invention, but rather one possible explanation of the biochemical mechanisms involved. Methods of Identifying Compounds Which Modulate Oligomerization Of GAPDH In an embodiment, the invention provides for methods for identifying an compound which modulates oligomerization of a dehydrogenase, e.g., GAPDH. The methods involve contacting the dehydrogenase with a compound under conditions which allow oligomerization of the dehydrogenase to occur; and measuring the ability of the compound to modulate oligomerization of the dehydrogenase as an indication of whether the compound is an oligomeric modulator of the dehydrogenase. The methods, in an embodiment, further involve contacting GAPDH with a compound under conditions which allow oligomerization of GAPDH to occur; and measuring the ability of the compound to modulate oligomerization of GAPDH as an indication of whether the compound is an oligomeric modulator of GAPDH. In an embodiment, the ability of the compound to modulate oligomerization of GAPDH is its ability to prevent the formation of a tetramer of GAPDH. In a further embodiment, the ability of the compound to modulate oligomerization of GAPDH is its ability to enhance the formation of a dimer of GAPDH. Without wishing to be bound by theory, it is believed that binding of compounds to GAPDH effectively prevents oligomer, e.g., tetramer, formation and enhances dimer formation, resulting in an amelioration or prevention of apoptosis. A variety of different techniques can be used to determine whether a compound modulates oligomerization of dehydrogenases such as GAPDH. One technique employs molecular modeling of the oligomeric/multimeric protein structure to determine compounds which will bind to the channel(s) formed where the monomers meet and thus inhibit or prevent oligomer formation, such as is set forth in non-limiting detail in Example 2. This method may also be used to screen libraries of compounds, using techniques familiar to those of ordinary skill in the art to determine compounds in the libraries which are GAPDH oligomeric modulators and are likely to also be an antiapoptotic agent. Another technique, which can also be used to confirm the results of a molecular modeling study, utilizes size exclusion chromatography (SEC) to classify the oligomers formed in the contacting step. For example, if the elution profile indicates that the primary product formed in the contacting step is not a tetramer, e.g., monomer or dimer, then the compound is a GAPDH oligomeric modulator and is likely to also be an antiapoptotic agent, consistent with the hypothetical model discussed above. Such methods may also be applied, as described herein, to screen libraries of compounds using techniques familiar to those of ordinary skill in the art to determine compounds in the libraries which are GAPDH oligomeric modulators and are likely to also be an antiapoptotic agent. One example of assessing the ability of a compound to bind to GAPDH and thus modulate GAPDH oligomerization is set forth in non-limiting detail in Example 3, below. Test Compounds Compounds for testing in the present methods can be derived from a variety of different sources. In preferred embodiments, libraries of compounds are tested in the present methods to identify compounds which modulate oligomerization of GAPDH. A recent trend in medicinal chemistry includes the production of mixtures of compounds, referred to as libraries. While the use of libraries of peptides is well established in the art, new techniques have been developed which have allowed the production of mixtures of other compounds, such as benzodiazepines (Bunin et al. 1992. J. Am. Chem. Soc. 114:10987; DeWitt et al. 1993. Proc. Natl. Acad. Sci. USA 90:6909) peptoids (Zuckermann. 1994. J. Med. Chem. 37:2678) oligocarbamates (Cho et al. 1993. Science 261 : 1303), and hydantoins (DeWitt et al. supra). Rebek et al. have described an approach for the synthesis of molecular libraries of small organic molecules with a diversity of 104-105 (Carell et al. 1994. Angew. Chem. Int. Ed. Engl. 33:2059; Carell et al. Angew. Chem. Int. Ed. Engl. 1994. 33:2061). Candidate compound librariess can be obtained using any of the numerous approaches in combinatorial library methods known in the art, including: biological libraries; spatially addressable parallel solid phase or solution phase libraries, synthetic library methods requiring deconvolution, the 'one-bead one-compound' library method, and synthetic library methods using affinity chromatography selection. The biological library approach is limited to peptide libraries, while the other four approaches are applicable to peptide, non-peptide oligomer or small molecule libraries of compounds (Lam, K.S. Anticancer Drug Des. 1997. 12:145). Exemplary compounds which can be screened for activity include, but are not limited to, peptides, nucleic acids e.g., small oligonucleotides, carbohydrates, small organic molecules, and natural product extract libraries. Other exemplary methods for the synthesis of molecular libraries can be found in the art, for example in: Erb et al. 1994. Proc. Natl. Acad. Sci. USA 91 :1 1422; Horwell et al. 1996 Immunopharmacology 33:68; and in Gallop et al. 1994. J. Med. Chem. 37:1233. Libraries of compounds may be presented in solution (e.g., Houghten (1992) Biotechniques 13:412-421), or on beads (Lam (1991) Nature 354:82-84), chips (Fodor (1993) Nature 364:555-556), bacteria (Ladner USP 5,223,409), spores (Ladner USP '409), plasmids (Cull et al. (1992) Proc Natl Acad Sci USA 89:1865-1869) or on phage (Scott and Smith (1990) Science 249:386-390); (Devlin (1990)Sc/ence 249:404-406); (Cwirla et al. (1990) Proc. Natl. Acad. Sci. 87:6378-6382); (Felici (1991) J. Mol. Biol. 222:301 -310); (Ladner supra. ). Other types of peptide libraries may also be expressed, see, for example, U.S. Patents 5,270,181 and 5,292,646). In still another embodiment, combinatorial polypeptides can be produced from a cDNA library. Formulations Comprising Compounds Identified in the Present Assays The invention provides pharmaceutically acceptable compositions which include a therapeutically-effective amount or dose of a compound identified in any of the instant assays and one or more pharmaceutically acceptable carriers (additives) and/or diluents. As described in detail below, the pharmaceutical compositions can be formulated for administration in solid or liquid form, including those adapted for the following: (1) oral administration, for example, aqueous or non-aqueous solutions or suspensions, tablets, boluses, powders, granules, pastes; (2) parenteral administration, for example, by subcutaneous, intramuscular or intravenous injection as, for example, a sterile solution or suspension; (3) topical application, for example, as a cream, ointment or spray applied to the skin; (4) intravaginally or intrarectally, for example, as a pessary, cream, foam, or suppository; or (5) aerosol, for example, as an aqueous aerosol, liposomal preparation or solid particles containing the compound. The phrase "pharmaceutically-acceptable carrier" as used herein means a pharmaceutically-acceptable material, composition or vehicle, such as a liquid or solid filler, diluent, excipient, solvent or encapsulating material, involved in carrying or transporting the compounds of the invention from one organ, or portion of the body, to another organ, or portion of the body without affecting its biological effect. Each carrier should be "acceptable" in the sense of being compatible with other ingredients of the composition and not injurious to the subject. Some examples of materials which can serve as pharmaceutically-acceptable carriers include: (1) sugars, such as lactose, glucose and sucrose; (2) starches, such as corn starch and potato starch; (3) cellulose, and its derivatives, such as sodium carboxymethyl cellulose, ethyl cellulose and cellulose acetate; (4) powdered tragacanth; (5) malt; (6) gelatin; (7) talc; (8) excipients, such as cocoa butter and suppository waxes; (9) oils, such as peanut oil, cottonseed oil, safflower oil, sesame oil, olive oil, corn oil and soybean oil; (10) glycols, such as propylene glycol; (11) polyols, such as glycerin, sorbitol, mannitol and polyethylene glycol; (12) esters, such as ethyl oleate and ethyl laurate; (13) agar; (14) buffering agents, such as magnesium hydroxide and aluminum hydroxide; (15) alginic acid; (16) pyrogen-free water; (17) isotonic saline; (18) Ringer's solution; (19) ethyl alcohol; (20) phosphate buffer solutions; and (21) other non-toxic compatible substances employed in „ _ _ 12 pharmaceutical compositions. Proper fluidity can be maintained, for example, by the use of coating materials, such as lecithin, by the maintenance of the required particle size in the case of dispersions, and by the use of surfactants. These compositions may also contain adjuvants such as preservatives, wetting agents, emulsifying agents and dispersing agents. Prevention of the action of microbes may be ensured by the inclusion of various antibacterial and antifungal agents, for example, paraben, chlorobutanol, phenol sorbic acid, and the like. It may also be desirable to include isotonic agents, such as sugars, sodium chloride, and the like into the compositions. In addition, prolonged absorption of the injectable pharmaceutical form may be brought about by the inclusion of agents which delay absorption such as aluminum monostearate and gelatin. In some cases, in order to prolong the effect of a drug, it is desirable to slow the absoφtion of the drug from subcutaneous or intramuscular injection. This may be accomplished by the use of a liquid suspension of crystalline or amorphous material having poor water solubility. The rate of absoφtion of the drug then depends upon its rate of dissolution which, in turn, may depend upon crystal size and crystalline form. Alternatively, delayed absoφtion of a parenterally-administered drug form is accomplished by dissolving or suspending the drug in an oil vehicle. Pharmaceutical compositions may be administered to epithelial surfaces of the body orally, parenterally, topically, rectally, nasally, intravaginally, intracisternally. They are of course given by forms suitable for each administration route. For example, they are administered in tablets or capsule form, by injection, inhalation, eye lotion, ointment, etc., administration by injection, infusion or inhalation; topical by lotion or ointment; and rectal or vaginal suppositories. The phrases "parenteral administration" and "administered parenterally" as used herein mean modes of administration other than enteral and topical administration, usually by injection, and includes, without limitation, intravenous, intramuscular, intraarterial, intrathecal, intracapsular, intraorbital, intracardiac, intradermal, intraperitoneal, transtracheal, subcutaneous, subcuticular, intraarticular, subcapsular, subarachnoid, intraspinal and intrasternal injection and infusion. The phrases "systemic administration," "administered systemically," "peripheral administration" and "administered peripherally" as used herein mean the administration of a sucrose octasulfate and/or an antibacterial, drug or other material other than directly into the central nervous system, such that it enters the subject's system and, thus, is subject to metabolism and other like processes, for example, subcutaneous administration. In some methods, the compositions can be topically administered to any epithelial surface. An "epithelial surface" according to this invention is defined as an area of tissue that covers external surfaces of a body, or which lines hollow structures including, but not limited to, cutaneous and mucosal surfaces. Such epithelial surfaces include oral, pharyngeal, esophageal, pulmonary, ocular, aural, nasal, buccal, lingual, vaginal, cervical, genitourinary, alimentary, and anorectal surfaces. Compositions can be formulated in a variety of conventional forms employed for topical administration. These include, for example, semi-solid and liquid dosage forms, such as liquid solutions or suspensions, suppositories, douches, enemas, gels, creams, emulsions, lotions, slurries, powders, sprays, lipsticks, foams, pastes, toothpastes, ointments, salves, balms, douches, drops, troches, chewing gums, lozenges, mouthwashes, rinses. Conventionally used carriers for topical applications include pectin, gelatin and derivatives thereof, polylactic acid or polyglycohc acid polymers or copolymers thereof, cellulose derivatives such as methyl cellulose, carboxymethyl cellulose, or oxidized cellulose, guar gum, acacia gum, karaya gum, tragacanth gum, bentonite, agar, carbomer, bladderwrack, ceratonia, dextran and derivatives thereof, ghatti gum, hectorite, ispaghula husk, polyvinypyrrolidone, silica and derivatives thereof, xanthan gum, kaolin, talc, starch and derivatives thereof, paraffin, water, vegetable and animal oils, polyethylene, polyethylene oxide, polyethylene glycol, polypropylene glycol, glycerol, ethanol, propanol, propylene glycol (glycols, alcohols), fixed oils, sodium, potassium, aluminum, magnesium or calcium salts (such as chloride, carbonate, bicarbonate, citrate, gluconate, lactate, acetate, gluceptate or tartrate). For topical application to be used in the lower intestinal tract or vaginally, a rectal suppository, a suitable enema, a gel, an ointment, a solution, a suspension or an insert can be used. Topical transdermal patches may also be used. Transdermal patches have the added advantage of providing controlled delivery of the compositions of the invention to the body. Such dosage forms can be made by dissolving or dispersing the agent in the proper medium. Compositions of the invention can be administered in the form of suppositories for rectal or vaginal administration. These can be prepared by mixing the agent with a suitable non-irritating carrier which is solid at room temperature but liquid at rectal temperature and therefore will melt in the rectum or vagina to release the drug. Such materials include cocoa butter, beeswax, polyethylene glycols, a suppository wax or a salicylate, and which is solid at room temperature, but liquid at body temperature and, therefore, will melt in the rectum or vaginal cavity and release the active agent. Compositions which are suitable for vaginal administration also include pessaries, tampons, creams, gels, pastes, foams, films, or spray compositions containing such carriers as are known in the art to be appropriate. The carrier employed in the sucrose octasulfate /contraceptive agent should be compatible with vaginal administration and/or coating of contraceptive devices. Combinations can be in solid, semi-solid and liquid dosage forms, such as diaphragm, jelly, douches, foams, films, ointments, creams, balms, gels, salves, pastes, slurries, vaginal suppositories, sexual lubricants, and coatings for devices, such as condoms, contraceptive sponges, cervical caps and diaphragms. For ophthalmic applications, the pharmaceutical compositions can be formulated as micronized suspensions in isotonic, pH adjusted sterile saline, or, preferably, as solutions in isotonic, pH adjusted sterile saline, either with or without a preservative such as benzylalkonium chloride. Alternatively, for ophthalmic uses, the compositions can be formulated in an ointment such as petrolatum. Exemplary ophthalmic compositions include eye ointments, powders, solutions and the like. Powders and sprays can contain, in addition to sucrose octasulfate and/or antibiotic or contraceptive agent(s), carriers such as lactose, talc, silicic acid, aluminum hydroxide, calcium silicates and polyamide powder, or mixtures of these substances. Sprays can additionally contain customary propellants, such as chlorofluorohydrocarbons and volatile unsubstituted hydrocarbons, such as butane and propane. Ordinarily, an aqueous aerosol is made by formulating an aqueous solution or suspension of the agent together with conventional pharmaceutically acceptable carriers and stabilizers. The carriers and stabilizers vary with the requirements of the particular compound, but typically include nonionic surfactants (T weens, Pluronics, or polyethylene glycol), proteins like serum albumin, sorbitan esters, oleic acid, lecithin, amino acids such as glycine, buffers, salts, sugars or sugar alcohols. Aerosols generally are prepared from isotonic solutions. Compositions can also be orally administered in any orally-acceptable dosage form including, but not limited to, capsules, cachets, pills, tablets, lozenges (using a flavored basis, usually sucrose and acacia or tragacanth), powders, granules, or as a solution or a suspension in an aqueous or non-aqueous liquid, or as an oil-in-water or water-in-oil liquid emulsion, or as an elixir or syrup, or as pastilles (using an inert base, such as gelatin and glycerin, or sucrose and acacia) and/or as mouth washes and the like, each containing a predetermined amount of sucrose octasulfate and/or antibiotic or contraceptive agent(s) as an active ingredient. A compound may also be administered as a bolus, electuary or paste. In the case of tablets for oral use, carriers which are commonly used include lactose and corn starch. Lubricating agents, such as magnesium stearate, are also typically added. For oral administration in a capsule form, useful diluents include lactose and dried corn starch. When aqueous suspensions are required for oral use, the active ingredient is combined with emulsifying and suspending agents. If desired, certain sweetening, flavoring or coloring agents may also be added. Tablets, and other solid dosage forms, such as dragees, capsules, pills and granules, may be scored or prepared with coatings and shells, such as enteric coatings and other coatings well known in the pharmaceutical-formulating art. They may also be formulated so as to provide slow or controlled release of the active ingredient therein using, for example, hydroxypropylmethyl cellulose in varying proportions to provide the desired release profile, other polymer matrices, liposomes and/or microspheres. They may be sterilized by, for example, filtration through a bacteria-retaining filter, or by incoφorating sterilizing agents in the form of sterile solid compositions which can be dissolved in sterile water, or some other sterile injectable medium immediately before use. These compositions may also optionally contain opacifying agents and may be of a composition that they release the active ingredient(s) only, or preferentially, in a certain portion of the gastrointestinal tract, optionally, in a delayed manner. Examples of embedding compositions which can be used include polymeric substances and waxes. The active ingredient can also be in micro-encapsulated form, if appropriate, with one or more of the above-described excipients. Liquid dosage forms for oral administration include pharmaceutically acceptable emulsions, microemulsions, solutions, suspensions, syrups and elixirs. In addition to the active ingredient, the liquid dosage forms may contain inert diluents commonly used in the art, such as, for example, water or other solvents, solubilizing agents and emulsifiers, such as ethyl alcohol, isopropyl alcohol, ethyl carbonate, ethyl acetate, benzyl alcohol, benzyl benzoate, propylene glycol, 1,3-butylene glycol, oils (in particular, cottonseed, groundnut, com, germ, olive, castor and sesame oils), glycerol, tetrahydrofuryl alcohol, polyethylene glycols and fatty acid esters of sorbitan, and mixtures thereof. Besides inert diluents, the oral compositions can also include adjuvants such as wetting agents, emulsifying and suspending agents, sweetening, flavoring, coloring, perfuming and preservative agents. Suspensions, in addition to the antiinfective agent(s) may contain suspending agents as, for example, ethoxylated isostearyl alcohols, polyoxyethylene sorbitol and sorbitan esters, microcrystalline cellulose, aluminum metahydroxide, bentonite, agar- agar and tragacanth, and mixtures thereof. Sterile injectable forms of the compositions of this invention can be aqueous or oleaginous suspension. These suspensions may be formulated according to techniques known in the art using suitable dispersing or wetting agents and suspending agents. Wetting agents, emulsifiers and lubricants, such as sodium lauryl sulfate and magnesium stearate, as well as coloring agents, release agents, coating agents, sweetening, flavoring and perfuming agents, preservatives and antioxidants can also be present in the compositions. The sterile injectable preparation may 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 may be employed including synthetic mono-or di-glycerides. Fatty acids, such as oleic acid and its glyceride derivatives are useful in the preparation of injectables, as are natural pharmaceutically-acceptable oils, such as olive oil or castor oil, especially in their polyoxyethylated versions. These oil solutions or suspensions may also contain a long-chain alcohol diluent or dispersant, such as Ph. Helv or similar alcohol. The practice of the present invention will employ, unless otherwise indicated, conventional techniques of cell biology, cell culture, molecular biology, microbiology, recombinant DNA, and immunology, which are within the skill of the art. Such techniques are explained fully in the literature. See, for example, Genetics; Molecular Cloning A Laboratory Manual, 2nd Ed., ed. by Sambrook, J. et al. (Cold Spring Harbor Laboratory Press (1989)); Short Protocols in Molecular Biology, 3rd Ed., ed. by Ausubel, F. et al. (Wiley, NY (1995)); DNA Cloning, Volumes I and II (D. N. Glover ed., 1985); Oligonucleotide Synthesis (M. J. Gait ed. (1984)); Mullis et al. U.S. Patent No: 4,683,195; Nucleic Acid Hybridization (B. D. Hames & S. J. Higgins eds. (1984)); the treatise, Methods In Enzymology (Academic Press, Inc., N.Y.); Immunochemical Methods In Cell And Molecular Biology (Mayer and Walker, eds., Academic Press, London (1987)); Handbook Of Experimental Immunology, Volumes I-IV (D. M. Weir and C. C. Blackwell, eds. (1986)); and Miller, J. Experiments in Molecular Genetics (Cold Spring Harbor Press, Cold Spring Harbor, N. Y. ( 1972)). The invention is further illustrated by the following examples which should not be construed as further limiting the subject invention. The contents of all references, issued patents, and published patent applications cited throughout this application including the background are hereby incoφorated by reference. Example 1 Binding Of DOMs To A Dehydrogenase And Increase Of Dehydrogenase Levels In Early Apoptosis It was shown that (-)-desmethyldeprenyl and CGP3466 bind to GAPDH and prevent the nuclear relocation of GAPDH. It was also shown that there was an increase in GAPDH levels found in early apoptosis. Photoaffinity binding techniques and a BODIPY chromogen attached to dibenzo[ό, joxepin-10-ylmethyl-prop-2-ynyl-amine (CGP3466), were used to study the protein and subcellular binding of (-)- desmethyldeprenyl (DES) and CGP3466. These studies showed CGP3466 bound to four proteins: tubulin, actin, synapsin and GAPDH. The subcellular localization of GAPDH in PC 12 cells entering apoptosis using immunocytochemistry and LCSM has been studied. In early apoptosis (at 3-12 hours after serum and NGF withdrawal GAPDH immunodensity had decreased in the cytosol, but had become densely concentrated in the nucleus. CGP3466 or DES treatment blocked the nuclear translocation GAPDH immunodensity. Similarly, treatment of partially differentiated PC 12 cells or fibroblasts with the nitric oxide (NO) donor SNAP induced apoptosis and similar nuclear translocation of GAPDH. NO enters the Rossman fold of GAPDH and frees the enzyme from AU-RNA (60, 90, 170). Treatment of fibroblasts with NAD + induced the dense translocation of GAPDH to the nucleus. NAD+ frees GAPDH from AU-RNA while the conversion of NAD+ to NADH allows this association to be re-established (40, 86, 102, 169). GAPDH cDNA was cloned from rat brain using oligonucleotides designed to the 5'- and 3'- ends of the coding region of rat GAPDH with PCR. The cDNA was used to produce a GAPDH- green fluorescent protein (GFP) construct by adding a 3' oligo (Gly)s to the Cterminus of GAPDH followed by a BamHI site to allow subcloning, in frame, into pEGFP-1 (Clontech). The resulting construct contains GAPDH followed by (Gly)5 and enhanced GFP. The insert was subcloned into the Hindlil-Notl sites of pcDNA3. The GAPDH-GFP construct has been transiently transfected into COS1 cells and stably transfected into HEK 293 cells. Apoptosis was induced in the living COS and Hek cells maintained in a physiological chamber on LCSM. Living cells were shown to have little or no GAPDH- GFP protein in their nuclei and showed a cytosolic distribution for the fusion protein that seemed identical to that shown with immunocytochemistry for GAPDH. The GAPDH-GFP fusion protein was shown to concentrate in the nucleus of a proportion of the cells in the first two hours after exposure to apoptosis initiating agents like Rose Bengal. These experiments established that GAPDH nuclear translocation occurs dynamically during the very early stages of apoptosis and indicate that GAPDH participates in the initiation phase of apoptosis. As well as the nuclear translocation, GAPDH levels increase rapidly in the early phases of apoptosis. The protein levels begin to increase at 1.5 to 2.0 hours after trophic withdrawal and that DES, CGP3466 and NAC prevent the increase. At least three molecules associated with toxin-induced neuronal apoptosis - nitric oxide, superoxide radical and peroxynitrite - have the capacity to free GAPDH from AU-rich RNA (Beckman and Koppenol, 1996). Nitric oxide modifies the structure of GAPDH and appears to free it from AU-rich RNA (Brune and Lapetina, 1995; Brune and Lapetina, 1996; Itoga et a/., 1997; McDonald and Moss, 1994). Oxygen free radicals enhance the binding of NAD+ to GAPDH (Marin et al., 1995). If, in fact, GAPDH translocation to the nucleus does initiate or facilitate apoptosis, then ROS and NO may induce apoptosis through GAPDH. We also found that NAD+ releases GAPDH from AU-rich RNA and thereby, increases the enzyme's glycolytic activity. Example 2 Modeling Of A Dehydrogenase Materials and methods: Crystal structure coordinates from the Brookhaven data base were used to produce GAPDH models. To date, there is not a protein structure of GAPDH from a rat source so the rat amino acid sequence was built onto the GAPDH structure of another organism using the molecular modeling program INSIGHT (Biosym). There is high conservation between GAPDH structures obtained from different sources and organisms leading to the belief that the rat GAPDH structure should be very similar to that from other animals. Several drug compounds were constructed, including N-acetyl cysteine, desmethyl deprenyl, and CGP3466 using INSIGHT. Finding the binding site of CGP3466: Inspection of the GAPDH model indicated that there is a large channel formed where the four monomers meet to form GAPDH. As the active site cleft was too large to consider that CGP3466 or desmethyl deprenyl bound there this channel was investigated. Any compounds which bind the active site cleft would be expected to decrease glycolysis and RNA binding which also occurs at this site. Both CGP 3466 and desmethyl deprenyl fit in the channel. The specific respective binding sites are not known, but molecular modeling data suggested that inserting drugs at the interface between the four monomers could both act to either stabilize the tetramer or cause it to fall apart. Both of the above-mentioned drugs disrupt the tetramer forming dimers. Also, if a destablizing agent such as sodium dodecyl sulfate is added, untreated protein becomes monomeric but treated protein remains dimeric. It was noted that the dimer comprises a "mini-channel" in which the drugs can bind. Confirming the location of the binding site: Antibody blocking experiments were conducted to confirm that CGP3466 bound GAPDH in the channel. In FIG. 2, GAPDH is shown in blue with the site for an antibody which was raised to a certain part of GAPDH is green. If one first treats the protein with antibody then drug there is no binding, indicating that blocking the channel inhibits binding. Other antibodies to GAPDH do not block drug binding. Selection of drug targets: It appears likely that desmethyl deprenyl and CGP3466 could bind other members of the dehydrogenase family. Most of these proteins are oligomeric/multimeric and channels are formed where these monomers meet. Further, these proteins contain a NAD binding site known as the Rossmann fold. This combination of common structural features means that the channel size would be similar for most dehydrogenases. For instance, molecular modeling of lactate dehydrogenase (LADH), a hexamer, suggest that both CGP3466 and desmethyl deprenyl bind in the LADH channel. Example 3 Identifying a Dehydrogenase Oligomeric Modulator A dehydrogenase oligomeric modulator is identified using size exclusion chromatographic (SEC) techniques. A test compound is tested for its ability to prevent tetramer formation of GAPDH and compounds capable of preventing or inhibiting such formation are identified as DOMs. SEC is used to determine if potential compounds affect the oligomeric state of GAPDH (or any oligomeric protein) when contacted with GAPDH under conditions which promote oligomer formation. This method can be further refined and sped up (i.e., faster data collection) by using SEC-high performance liquid chromatographic (SEC-HPLC) methods. An example is set forth below. Column Formation A column was made using a disposable 1cm diameter column (BIORAD). The chosen matrix for the column was Sephacryl H-300 (PHARMACIA). The column was poured by mixing the beads (SEPHACRYL) in a buffer and layering into the column until the bed was about 12 cm long. The buffer used was 50 mM TRIS-HC1, pH 8.0. The column was then washed with the same buffer for 10 column volumes. Column Standardization/Calibration A selection of protein standards of known molecular weight was run through the column. Hence, the elution time any of the proteins can be calculated by collecting fractions of equal volume (500 ml) and measuring for protein by optical density at 280nm. Once the column is calibrated, the molecular weight of the eluted fractions (in this case, GAPDH monomers, dimers and tetramers) may be determined. Hence, one can determine from an elution profile 1) the relative proportion of GAPDH monomer, dimer and tetramer, and 2) any binding of GAPDH to other molecules such as DNA or RNA (which is believed to decrease upon contact of GAPDH with compounds which interfere with tetramer formation/promote dimer formation. Experimentation Prior to moving the proteins to the column they are contacted with candidate compound and mixed at room temperature in, e.g., nanomolar concentrations under conditions known to those skilled in the art. The mixture prepared above is then added to the column and eluted with 50 mM TRIS-HC1 pH 8.0 buffer. 500μl fractions of the eluent are collected. The optical density of the fractions is then determined, e.g., at 280nm, and an elution profile prepared and analyzed to determine the extent of oligomerization. Example 4 Identification of (-)-Desmethyldeprenyl And CGP3466 as Oligomeric Modulators of GAPDH GAPDH is a tetramer consisting of four identical monomers (FIG.l). The tetramer exists in equilibrium between tetramers, dimers and monomers. This equilibrium strongly favors the tetrameric form. Upon tetramer formation, there is a channel present between the four monomers. Size exclusion chromatography as in Example 3 was used to show that GAPDH is largely in a tetrameric form when bound to poly-U RNA, but is converted to a dimer in the presence of certain compounds, e.g., DES or CGP3466 (FIG. 3). 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Claims: What is claimed is: 1. A method for identifying a dehydrogenase oligomeric modulator, comprising: contacting the dehydrogenase with a compound under conditions which allow oligomerization of the dehydrogenase to occur; and measuring the ability of the compound to modulate oligomerization of the dehydrogenase as an indication of whether the compound is a dehydrogenase oligomeric modulator. 2. A method for identifying an oligomeric modulator of GAPDH, comprising: contacting GAPDH with a compound under conditions which allow oligomerization of GAPDH to occur; and measuring the ability of the compound to modulate oligomerization of GAPDH as an indication of whether the compound is an oligomeric modulator of GAPDH. 3. The method of claim 2 wherein the ability of the compound to modulate oligomerization of GAPDH is its ability to prevent the formation of a tetramer of GAPDH. 4. The method of claim 2 wherein the ability of the compound to modulate oligomerization of GAPDH is its ability to enhance the formation of a dimer of GAPDH. 5. A method for identifying an antiapoptotic agent, comprising: contacting GAPDH with a compound under conditions which allow oligomerization of GAPDH to occur; and measuring the ability of the compound to modulate oligomerization of GAPDH as an indication of whether the compound is an antiapoptotic agent. 6. The method of claim 5 wherein the ability of the compound to modulate oligomerization of GAPDH is its ability to prevent the formation of a tetramer of GAPDH. 7. The method of claim 5 wherein the ability of the compound to modulate oligomerization of GAPDH is its ability to enhance the formation of a dimer of GAPDH. 8. A method of screening a library of compounds for their ability to modulate oligomerization of GAPDH, comprising: contacting GAPDH with a sample of a library of compounds under conditions which allow oligomerization of GAPDH to occur; classifying any oligomers formed; and identifying the compounds that modulate oligomerization of GAPDH as an indication of whether the compounds are modulators of oligomerization of GAPDH. 9. The method of claim 8 wherein the ability of the identified compounds to modulate oligomerization of GAPDH is the ability to prevent the formation of a tetramer of GAPDH. 10. The method of claim 8 wherein the ability of the identified compounds to modulate oligomerization of GAPDH is the ability to enhance the formation of a dimer of GAPDH. 11. The method of claim 8 wherein the ability of the identified compound to modulate oligomerization of GAPDH is the ability to bind to GAPDH and thus prevent GAPDH oligomer formation. 12. A method for identifying an antiapoptotic agent, comprising: contacting a dehydrogenase with a compound under conditions which allow oligomerization of the dehydrogenase to occur; and measuring the ability of the compound to modulate oligomerization of the dehydrogenase as an indication of whether the compound is an antiapoptotic agent. 13. A method of screening a library of compounds for their ability to modulate dehydrogenase oligomerization, comprising: contacting a dehydrogenase with a sample of a library of compounds under conditions which allow oligomerization of the dehydrogenase to occur; classifying any oligomers formed; and identifying the compounds that modulate dehydrogenase oligomerization as an indication of whether the compounds are dehydrogenase oligomeric modulators. 14. The method of claim 13 wherein the ability of the identified compound to modulate dehydrogenase oligomerization is the ability to bind to the dehydrogenase and thus prevent the dehydrogenase oligomer formation.

Inventors: BORDEN KATHERINE, TATTON WILLIAM G, BORDEN, KATHERINE, TATTON, WILLIAM, G.
Applicants: BORDEN KATHERINE, TATTON WILLIAM G, BORDEN, KATHERINE, TATTON, WILLIAM, G.
Application year: 1999
Main classification: G01N
IPC codes: C12Q1, G01N33