NOVEL KERATINOCYTE GROWTH FACTOR-2 ANALOGUE IN HAIR FOLLICLE

Abstract: This invention relates to a novel keratinocyte growth factor-2 analogue (KGF-2A), its gene, the preparation method thereof and the therapeutic use thereof. The KGF-2A of the present invention has a characteristic of its restricted expression in hair follicles derived from alopecia patients and shows its stimulatory effect on hair-follicle cell proliferation. Therefore KGH-2A can be used to prevent or treat alopecia and to promote or accelerate hair growth and hair-follicle repair.

Description: [Specification] [Title of the Invention] NOVEL KERATINOCYTE GROWTH FACTOR-2 ANALOGUE IN HAIR FOLLICLE [Technical field] The present invention relates to a newly isolated keratinocyte growth factor-2 analogue(referred to as "KGF-2A" hereinafter), the gene encoding it, the preparing method thereof and the therapeutic uses thereof. More specifically, the present invention relates to a mutant form of KGF-2 which is newly isolated from hair- follicles of human scalp skin, the gene encoding said mutant protein, the expression vector containing said gene, the transformant transformed with said vector, and the preparing method of KGF-2A by culturing said transformant. The KGF-2A concerning to this invention has a characteristic of its reduced expression in hair-follicles derived from alopecia patients and shows its stimulatory effect on hair- follicle cell proliferation. Therefore, the KGF-2 A can be used to prevent or treat alopecia and to promote or accelerate hair growth and hair-follicle repair. [Background of the Art] The hair-follicle is an epidermal derivative that undergoes cycles of growth (anagen), involution (catagen), and rest (telogen). Although the mechanisms underlying hair cycling have not been fully elucidated, the core of the process is interactions between the mesenchymal and epithelial cell populations within the hair follicle unit (Jahoda, C. A. & Reynolds, A. J. (1996) Dermatol. Clin. 14, 573-583). The most obvious force in the cycle is the papillary mesenchyme, in particular the dermal papilla. Factors from the papillary mesenchyme act as inductive signals for cycling of the follicular epithelium (Peus, D. & Pittelkow, M. R. (1996) Dermatol. Clin. 14, 559-572). In particular, it has been inferred that epithelial stem cells, which reside in the bulge area of the hair follicles, can respond to the inductive signal from the dermal papilla and be activated(Cotsarelis, G. , Sun, T. T. & Lavker, R. M. (1990) Cell 61, 1329-1337). This activation leads to proliferation of stem cells in the bulge area, and then the stem cell progeny forms a downgrowth into the deep dermis, followed by differentiative growth of matrix cells and generation of the complex follicular product, the shaft, and its housing sheath. Analyses of the skin phenotypes of a considerable number of transgenic or gene knockout mice have shed light on the mesenchymal(dermal papilla) and epithelial keratinocyte) interactions involved in the morphogenesis of hair follicles in the fetus (Gat, U. et al. (1998) Cell 95, 605-614 ; Chiang, C. et al. (1999) Dev. Biol. 205, 1-9 ; Botchkarev, V. A. et al. (1999) Nat. Cell Biol. 1, 158-164). However, the mechanisms underlying the biological switch in postnatal follicles occurring between telogen and anagen have remained unclear. The most likely candidate for such factors is KGF-2, because KGF-2 is found in the dermal papilla iϊbroblasts and its receptor FGFR2IIIb, in the neighboring keratinocytes (Katsuoka K, Schell H, Hornstein OP, Wessel B. (1987) Br. J. Dermatol Mar 116(3), 464-5). The kgf-2(fgf-10) gene is a member of the fibroblast growth factor(referred to as "FGF" hereinfter) gene family comprising more than 22 members in mammals currently(Νishimura T. Nakatake Y. Konishi M. Itoh N. (2000) Biochim. Biophys. Acta. 1492, 203-206). The FGF members are thought to regulate cellular proliferation, differentiation, migration, and survival by binding to and activating members of a family of tyrosine kinase receptors, i. e. FGF receptors (FGFRs). Among 22 FGF members, KGF-2 is structurally most related to FGF-7 (Miki T. et al (1991) Science 251, 72-75 ; Ornitz D. M. et al. (1996) J. Biol. Chem. 271, 15292-15297 ; Igarashi M. et al. (1998) J. Biol. Chem. 215, 13230-13235), and both FGFs specifically bind to an isoform out of four FGFRs, i. e. FGFR2IIIb(Miki T. et al (1991) Science 251, 72-75 ; Ornitz D. M. et al. (1996) J. Biol. Chem. Ill, 15292-15297 ; Igarashi M. et al. (1998) J. Biol. Chem. 273, 13230-13235). Functionally, on the other hand, KGF-2 was shown to be involved in outgrowth of the limb bud and branching morphogenesis of the lung(Martin G. R. (1998) Genes Dev. 12, 1571-15869). The limb and lung buds are typical examples of organprimordia, which require intimate epithelial-mesenchymal interactions during development. In epithelial-mesenchymal interactions, signals from the mesenchyme direct the epithelial components to generate specific structures through budding or branching morphogenesis, and reciprocal interactions between the two tissues must be maintained during further development. It has been disclosed in U.S. Patent No. 5,184,605, U.S. Patent No. 5,824,643 and U.S. Patent No. 5,965,530 that KGF-1 stimulates proliferation, growth and differentiation in various cells of epithelial tissue, besides keratinocytes and therefore it can be used as a therapeutic agent for the specific treatment of disease states and medical conditions afflicting tissues and organ such as the dermal adnexae, the liver, the lung and the gastrointestinal tract, wherein the dermal adnexae are such as sebaceous glands, sweat glands and hair follicles. However, since the re-epithelialization activity of KGF was only observed in the dermis having a induced wound, KGF of the above references might be used for treatment of chemotherapy-induced alopecia. That is, the use of a KGF for treatment of inherited alopecia was not taught or suggested by the above references. Further, Ruben et al., U.S. Patent No. 6,077,692, disclose a newly identified KGF-2 which exhibits biological activities such as wound healing, anti-inflammatory effect, stimulation for differentiation and proliferation of liver cell, protection of lung damage. However, there is no experimental data about effect of KGF-2 on the proliferation of hair-follicle cells. Therefore, the use of KGF-2 for the treatment of alopecia was not supported by the prior art. The above references were incorporated by reference herein in its entirety. Accordingly, the present inventors had undertaken studies in an attempt to isolate a molecular factor occurring alopecia and developed KGF-2 analogue from human hair- follicle, which has a characteristic of its reduced expression in hair-follicles derived from alopecia patients and shows its stimulatory effect on hair-follicle cell proliferation [ Disclosure of Invention ] The object of the present invention is to provide a newly isolated KGF-2A which has a characteristic of its reduced expression in hair-follicles derived from alopecia patients and shows its stimulatory effect on hair-follicle cell proliferation, and thus can be used to prevent or treat alopecia and to promote or accelerate hair growth and hair-follicle repair. Accordingly, the present invention provides KGF-2A comprising an amino acid sequence which is substituted Glu for Lys at the 87 th codon of that of KGF-2. The KGF- 2A is a mutant form of KGF-2 and could be derived from hair-follicles of human scalp skin. The KGF-2A concerning to the present invention may comprise 40 th to 208 th amino acids or 2 nd to 208 th amino acids of SEQ ID NO:l, and may further comprise a Met residue respectively at the N-terminus of said amino acid sequences. Further, said KGF- 2A may be mature protein. The present invention also provides a gene encoding KGF-2A. The kgf-2a gene may encode 2 nd to 208 th amino acids or 40 th to 208 th amino acids of SEQ ID NO:l, and may further comprise an initiation codon respectively at 5 '-end of said genetic code sequences . In particular, the kgf-2a gene concerning to the present invention may comprise 4 th to 627 th nucleotides or 118 th to 627 th nucleotides of SEQ ID NO: 2, and further comprises an initiation codon respectively at 5 '-end of said nucleotide sequences. The present invention also provides a method for producing KGF-2A. The method concerning to the present invention comprises subcloning kgf-2a gene to a vector, transforming host cells with said vector and culturing said transformants, wherein said kgf-2a gene encodes 2 nd to 208 th amino acids or 40 th to 208 th amino acids of SEQ ID NO:l, and may further comprise an initiation codon respectively at 5 '-end of said genetic code sequences. The said kgf-2a gene may be a fused gene bound with additional nucleotide sequences. The present invention also provides a pharmaceutical composition containing KGF-2A or its gene as an effective component, wherein said KGF-2A comprises 2 nd to 208 th amino acids or 40 th to 208 th amino acids of SEQ ID NO:l and further comprises a Met residue respectively at N-terminus of said amino acid sequences, wherein said KGF- 2A may be mature protein. Furthermore, said kgf-2a gene encodes 2 nd to 208 th amino acids or 40 th to 208 th amino acids of SEQ ID NO:l and further comprises an initiation codon respectively at 5 '-end of said genetic code sequences, and the said kgf-2a gene may be a fused gene bound with additional nucleotide sequences. The pharmaceutical composition concerning to the present invention is useful for preventing or treating alopecia and for promoting or accelerating hair growth and hair- follicle repair. The present invention also provides a method of using KGF-2A or its gene to prevent or treat alopecia, comprising administering the pharmaceutical composition containing KGF-2A or its gene as an effective component. In one aspect, the present invention is directed to KGF-2A which is newly isolated from hair-follicles of human scalp skin and is a mutant form of KGF-2. To isolate KGF-2A from hair-follicles of human scalp skin, total mRNA was extracted from said hair-follicle and then cDNA was obtained from the total RNA by performing RT-PCR with complementary ohgonucleotides. After the nucleotide sequence of cDNA produced by the above RT-PCR was identified, the amino acid sequence corresponding to nucleotide sequence of said cDNA was deduced and determined. As a result, one of the deduced amino acid sequence was identified as an amino acid sequence with substitution of Glu for Lys at the 87 th codon of that of KGF-2, and presented in SEQ ID NO:l. The present inventors refer to a newly isolated mutant form of KGF-2 as KGF-2 A. In preferred embodiment of the invention, the KGF-2A comprises 2 nd to 208 th amino acids or 40 th to 208 th amino acids of SEQ ID NO: 1 and further comprises a Met residue respectively at N-terminus of said amino acid sequences. The KGF-2A concerning to the present invention can be derived from hair- follicles of human scalp skin and shows its different expression between in hair-follicles of alopecia patients and in hair-follicles of normal people. To investigate the expression level of KGF-2 A in hair-follicle of alopecia patient and normal person, hair- follicles with a morphological structure characteristic of anagen were obtained from human scalp skin both of normal people and alopecia patients, then total mRNA was extracted from said hair-follicles, and cDNA was obtained from the total RNA by RT-PCR and analyzed on agarose gel. Result of agarose gel analysis showed that cDNA from normal people was detected while that from alopecia patients was not detected, on the contrary cDNA of KGF-2 A receptor was detected from both (see Fig. 3), which suggests KGF-2 A being a molecular factor regulating hair loss. Another aspect of the present invention is kgf-2a gene encoding KGF-2 A. Since the KGF-2 A has an amino acid sequence with substitution of Glu for Lys at the 87 th codon of that of KGF-2, the kgf-2a gene may be constituted of all possible genetic codes encoding said amino acid sequence. Furthermore, the said gene may be in the form of cDNA or gDNA, and in later case it may comprise non-coding region such as intron. In preferred embodiment of the invention, kgf-2a gene encodes 2 nd to 208 th amino acids or 40 th to 208 th amino acids of SEQ ID NO:l and may further comprise an initiation codon respectively at 5 '-end of said genetic code sequences. In particularly preferred embodiment, kgf-2a gene comprises 4 th to 627 th or 118 th to 627 th nucleotides of SEQ ID NO: 2, and further comprises an initiation codon respectively at 5 '-end of said nucleotide sequences. Of course, it would be routine for those skilled in the art to generate the variants of the above nucleotide sequences by the degeneracy of the genetic code. To obtain kgf-2a gene, total RNA was extracted from hair-follicle cell. As generally known to those of skill in the art, total RNA derived from a cell can be converted to cDNA by PCR or RT-PCR using the oligo-nucleotide primer corresponding to a specific nucleotide sequence of the gene intended amplifying. In this regard, oligo-nucleotide primers of SEQ ID NO: 3 and SEQ ID NO: 4 were utilized to amplify the kgf-2a gene comprising 1 st to 627 th nucleotides of SEQ ID NO: 2 and oligo-nucleotide primers of SEQ ID NO: 9 and SEQ ID NO: 10 were used to amplify the kgf-2a gene comprising 118 th to 627 th nucleotides of SEQ ID NO: 2. Especially, total RNA extracted from hair- follicle cell was used as template to perform PCR with oligo-nucleotide primers of SEQ ID NO: 3 and SEQ ID NO: 4. The nucleotide sequence of PCR product was identified, which provides a new cDNA sequence with substitution of Glu for Lys at the 87 th codon of that of human kgf-2 gene already reported (see Fig. 1 and SEQ ID NO:2). The gene, newly isolated by the above process is referred to as kgf-2a gene, was inserted the pGEM-t vector and has been deposited as pGEM-T-KGF-2A with Korean Collection for Type Cultures on Mar. 19, 2001 (Accession No.: KCTC 1012BP). In a further aspect, the present invention provides a method for producing KGF- 2A. Generally, KGF-2A can be produced by direct synthetic process corresponding to amino acid sequence of SEQ ID NO:l, isolated from hair-follicles of human scalp skin, or prepared by recombinant expression using kgf-2 a gene. In preferred embodiment of the invention, the KGF-2A is produced by subcloning kgf-2a gene to a vector, transforming a host cell with said vector and culturing said transformant, wherein said kgf-2a gene encodes 2 nd to 208 th amino acids or 40 th to 208 th amino acids of SEQ ID NO:l and may further comprise an initiation codon respectively at 5 '-end of said genetic code sequences. The said kgf-2a gene may be a fused gene bound with additional nucleotide sequences. Examples of additional nucleotide sequences include signals for the compartment following protein expression, membrane anchor sequences, immunogenic detergent, tag for appreciate isolation or purify, enzyme-specific restriction sequence and so on. The additional sequences can be cut or removed after expression or purification of protein in accordance with the objects. In particular, the recombinant plasmid may be constructed by subcloning kgf-2a gene into a commercial expression vector such as pET9c or pGEX-2T. The pET9c vector contains T7 promoter inducing high expression of target gene. The pGEX-2T vector contains GST (Glutathion S Transferase)-encoding sequence upstream of the insertion site for target gene, which results in expression of GST-fused protein. The pGEX-2T-KGF2A recombinant plasmid was constructed by subcloning the kgf-2a gene into the pGEX-2T vector, wherein said kgf-2a gene comprised 118 th to 627 th nucleotides of SEQ ID NO:2 except 1 st to 117 th nucleotides encoding the signal sequence. The transformant may be prepared by transforming host cells such as E. coli with the recombinant plasmids containing kgf-2a gene using well-known methodology, e.g. calcium-phosphate precipitation, liposome mediation, microinjection, transfection with electroporation and so on. In preferred embodiment of the invention, E.coli strain BL21(DE3) was utilized as host cell, that is, E.coli BL21(DE3) was transformed with said pGEX-2T-KGF2A vector. Generally, to isolate and purify the protein from the transformant, the transformant is cultured for an appropriate time and then lysated. After that, chromatography, dialysis and/or filtration are performed. In preferred embodiment of the invention, the above E.coli BL21(DE3) containing pGEX-2T-KGF2A vector was cultured for 48 hours or more and lysated. Then said cell lysate was applied to the heparin-Sepharose column, hKGF-2A was eluted with concentration-gradient NaCl solutions therefrom and purified. If the transformant transformed with pGEX-2T-KGF2A vector was cultured, GST-KGF2A fusion protein would be expressed. In that case, said fusion protein can be specifically harvested by using glutathion column chromatography. Then, the GST moiety may be removed from target protein by trombin treatment. The selection and application of suitable column for isolation and purification of protein will be appreciate to those skilled in the art. In case of subcloning a fused gene composed of kgf-2a gene fused with additional nucleotide sequences into a expression vector, additional nucleotides moiety might be cut or removed by using enzyme such as trypsin after expression of fusion protein. The apparent molecular mass of KGF -2 A identified by running it on agarose gel was approximately 20 kDa and that of GST- KGF2A was 45 kDa, consistent with the predicted molecular weight (see Fig. 2). In another aspect, the present invention is also directed to a pharmaceutical composition containing KGF-2A or its gene as an effective component, wherein said KGF-2A comprises 2 nd to 208 th amino acids or 40 th to 208 th amino acids of SEQ ID NO:l and further comprises a Met residue respectively at N-terminus of said amino acid sequences, wherein said KGF-2A may be mature protein. Furthermore, said kgf-2a gene encodes 2 nd to 208 th amino acids or 40 th to 208 th amino acids of SEQ ID NO:l and further comprises an initiation codon respectively at 5'- end of said genetic code sequences, and the said kgf-2a gene may be a fused gene bound with additional nucleotide sequences. The mitogenic activity on human hair-follicles was measured to investigate the biological activities of KGF-2A. Particularly, KGF-2A was treated to hair- follicle cells from human scalp skin, and after a lapse of some hours, cell proliferation was measured by colorimetric MTS assays. Accordingly, as seen in Fig. 5, the addition of KGF-2 A resulted in dose- dependent stimulation to proliferation of human hair-follicle cells with the maxium stimulatory effect of 30 ng/ml and with the increased effect of 140% to negative control of 100%. Further, to exclude affect by endogenous KGF-2, KGF-2A was treated to human hair- follicles in which dermal papilla was removed surgically. Then, cell proliferation was measured by colorimetric MTS assays. Interestingly, KGF-2A stimulated the proliferation of DP-deleted hair-follicle cells with the outstandingly increased level compared to DP-containing hair-follicle cells (see Fig. 6 A and 6B). KGF-1 is a close member to KGF-2 in FGF family. Thus the stimulatory effect of KGF-2 A is worth being compared to that of KGF-1 and KGF-2. Accordingly, human hair-follicle cells derived from scalp skin were treated with KGF-1, KGF-2 and KGF-2 A respectively, and a lapse of some hours, their proliferation rate was measured by colorimetric MTS assays. Further, human hair-follicles, in which dermal papilla was removed surgically to exclude affect by endogenous KGF-2, were treated with KGF-1, KGF-2 and KGF-2A respectively. As a result, KGF-2A stimulated significantly the proliferation of human hair- follicle cells compared to KGF-2 and KGF-1, which was independent on removal of dermal papilla (see Fig 7A and 7B). Since it is elucidated that KGF-2A concerning to the present invention exhibits an effect on stimulating the proliferation of hair-follicle cells, KGF-2 A can be used as an effective component of a pharmaceutical composition for prevention or treatment of alopecia and for promotion or acceleration of hair growth and hair-follicle repair. In this regard, the kgf-2a gene encoding KGF-2 A also can be used as gene therapy for prevention or treatment of alopecia and for promotion or acceleration of hair growth and hair-follicle repair. The pharmaceutical compositions may be prepared by mixing KGF-2A or kgf-2a gene with pharmaceutically acceptable excipient or adjuvant following formulation using traditional formulating methods. Said formulating methods comprise inserting the kgf- 2a gene into vector for gene therapy. Another preferred aspect includes methods for preventing or treating alopecia with KGF-2A or its gene, wherein said methods comprise administering a pharmaceutical composition containing KGF-A or its gene as an effective component on patient's scalp skin by transdermal. In particular, a pharmaceutical composition containing KGF-2A or its gene may be administered by oral or parenteral, i.e. intravenous, subcutaneous, intramuscular, percutaneous or intrarectal, preferably transdermal like directly applying on scalp skin. [Brief Description of Drawings] FIG. 1 shows amino acid sequence comparison of human KGF-2A with human KGF-2. FIG. 2 is a photograph of SDS-polyacrylamide gel electrophoresis showing molecular mass of GST-KGF2 A and KGF-2 A prepared by the present method. FIG. 3 shows the expression level of KGF-2A and KGF-2 A receptor respectively in hair-follicles which were derived from human scalp skin of normal people or alopecia patients. FIG. 4 shows a restriction map of the pGEM-T-KGF-2A vector( Accession No.: KCTC 1012BP) constructed by inserting KGF-2 A DNA comprising nucleotide sequence of SEQ ID NO:2 into the pGEM-T vector. FIG. 5 is a graph showing the stimulatory activity of KGF-2 A on hair-follicle cell proliferation identified by colorimetric MTS assays. FIG. 6A is a bar chart showing stimulatory activity of KGF-2A on proliferation of hair-follicle which was derived from normal person and in which dermal papilla was removed surgically, FIG. 6B is a bar chart showing stimulatory activity of KGF-2A on proliferation of hair- follicle cell with dermal papilla. FIG. 7 A is a bar chart showing stimulatory activity of KGF-1, KGF-2 and KGF- 2A respectively on proliferation of hair- follicle derived from alopecia patients, FIG. 7B is a bar chart showing stimulatory activity of KGF-1, KGF-2 and KGF-2A respectively on proliferation of hair-follicle which was derived from alopecia patients and in which dermal papilla was removed surgically. [Best Mode for Carrying Out the Invention] The following examples will further illustrate the present invention, which by no means limits the spirit or the scope of the present invention. EXAMPLE 1 Isolation of hair-follicles Hair-follicles with a morphological structure characteristic of anagen were obtained from human scalp skin both of normal people and alopecia patients. EXAMPLE 2 Isolation of the Human KGF-2 A cDNA Reverse transcription was performed using total RNA extracted by Trizol (Gibco BRL) from hair follicles obtained in Example 1. Precisely, total RNA(lg) of human hair-follicles was incubated for 60 min at 37°C in a reaction mixture(20/) containing 300 units of Moloney murine leukemia virus reverse transcriptase, 15 units of human placenta RNase inhibitor and 0.5g of a random hexadeoxynucleotide primer, which resulted in the production of cDNA solution. To specifically amplify the human kgf-2a cDNA fragment from said cDNA solution, PCR with Gene Amp PCR System 9600(Perkin-Elmer) was performed for 30 cycles in a reaction mixture containing an aliquot of the above cDNA solution, 0.05 unit/1 Taq DNA polymerase, and 4 pmol/1 of each of the sense primer of SEQ ID NO:3 and antisense primer of SEQ ID NO:4 corresponding to the sequences of 1 st to 208 th amino acids of human KGF-2. Human hair-follicle cDNA amplified by PCR represented all possible genetic codes corresponding to 1 st to 208 th amino acids of human KGF-2. The cDNA of the expected size of 627 base-pairs was cloned as the major amplified product. Five clones were randomly selected, and their nucleotide sequences were determined. Precisely, said amplified cDNA of 627 base-pairs was cloned into the pGEM-T(Promega Biotech) and the nucleotide sequence of the cloned cDNA was determined with an Applied Biosystems model 377 DNA sequencer(Perkin-Elmer) using dideoxy terminator cycle sequencing (Applied Biosystems). As a result, it was identified that one of the five clones had a sequence with the substitution of Glu for Lys at the 87 th codon of that of the human KGF-2 cDNA, that is analogous to that of the human KGF-2 cDNA, suggesting that it was a human KGF-2 analogue (KGF-2A) cDNA clone. The nucleotide sequence of the coding region of the human KGF-2A cDNA (627 nucleotides) is shown in SEQ ID NO:2, which is highly homologous (99.5%) to that of human KGF-2. The above human KGF-2A cDNA was inserted the pGEM-T vector and has been deposited as pGEM-T-KGF-2A with Korean Collection of Type Cultures on Mar. 19, 2001 (Accession No.: KCTC 1012BP). The pGEM-T vector contains T7 Sp6 RNA polymerase dual promotor(-17 to +3) and lac operator(200 to 216). The nucleotide sequence of SEQ ID NO:2 allowed the elucidation of the complete amino acid sequence (208 amino acids) of human KGF-2 A, wherein 4 th to 117 th nucleotides encodes the putative signal sequence of KGF-2 A. The amino acid sequence of KGF-2A is shown in SEQ ID NO:l. EXAMPLE 3 Analysis of Expression of KGF-2A and its Receptor FGFR2IIIb mRNA by RT-PCR The mRNA level of KGF-2A from human hair-follicles was analyzed to investigate the expression level of KGF-2 A. The mRNA of KGF-2A was specifically converted to cDNA by the RT-PCR using oligonucleotide primers of SEQ ID NO:5 and SEQ ID NO:6 which flank a 427-base pair coding sequence(l 19 to 627) of human KGF-2 A. In particular, total RNA (lg) extracted from hair- follicles was converted to cDNA by PCR preformed for 40 cycles at 94°C for 1 min, 55°C for 1 min, and 72°C for 2 min in a reaction mixture containing 15 units of Moloney murine leukemia virus reverse transcriptase and said oligonucleotide primers of SEQ ID NO:5 and SEQ ID NO:6. Further, to investigate the expression level of KGF-2A receptor, i. e. FGFR2 Illb, the RT-PCR was performed using oligonucleotide primers of SEQ ID NO: 7 and SEQ ID NO:8 which flank a 350-base pair coding sequence(699 to 1049) of human FGFR2IIIb. Precisely, mRNA of FGFR2IIIb was specifically converted to cDNA by the RT- PCR having the reaction profile consisted of one cycle at 94°C for 1 min, followed by 35 cycles at 94°C for 1 min, 58°C for 30 sec, and 72°C for 1 min with a final extension of 5 min at 72°C. The RT-PCR products were analyzed in 1.5% agarose gel and mRNA level of β- actin was also analyzed as an internal control. As shown in Fig. 3, the result of agarose gel analysis shows that cDNA from normal people was detected while that from alopecia patients was not detected, contrary to cDNA of KGF-2 A receptor detected from both. Furthermore, as shown in Table 1 , the KGF-2 A cDNA is absent in seven of seven human hair follicles from alopecia patients while that of normal hair follicles shows KGF- 2A expression in four of seven with significant difference (PO.05). [Table 1 ] KGF-2 A expression in human hair- follicles Results as the above suggests that it exists that silent carriers who are looked as normal people in appearance but have a reduced expression of KGF-2A in their hair- follicles due to inherited factor, further are very likely to develop alopecia. EXAMPLE 4 Preparation of Recombinant KGF-2 A The cDNA encoding 40 th to 208 th amino acids of human KGF-2A of SEQ ID NO:l was amplified with the human KGF-2 cDNA as a template by PCR for 25 cycles using Taq DNA polymerase and the primers of SEQ ID NO:9 and SEQ ID NO: 10. The amplified region corresponded to that encoding the putative mature growth factor following secretion and cleavage of the signal sequence. The PCR product was subcloned into the pET9c plasmid (Novagen) and E. coli BL21(DE3) was transformed with the pET9c-KGF-2A. The transformant produced by the above process was cultured for 48 hours and lysated. Then said cell lysate was applied to the heparin-Sepharose column. Analysis of successive fractions of increasing NaCl concentration eluted from the heparin-Sepharose column determined that the majority of hKGF-2A eluted with the 1.0 M NaCl fraction, as determined by silver staining of proteins separated by SDS-PAGE, although some protein also eluted in the 0.8 and 1.2 M NaCl fractions. The apparent molecular mass of the polypeptide was approximately 20 kDa, consistent with the predicted molecular weight. Amino acid analysis of a sample of protein eluted at 1.0M NaCl confirmed that the preparation consisted of substantially pure KGF-2A, whose amino terminus was in agreement with that predicted from the sequence. EXAMPLE 5 Preparation of Recombinant KGF-2A using GST-fusion System The cDNA of hKGF-2A amplified according to Example 4 was digested with restriction enzymes EcoRI and BamHl and ligated in the EcoRVBamϋl site of the pGΕX- 2T expression vector. Then obtained pGΕX-2T-KGF2A recombinant vector was transfected into E. coli BL21 (DE3) by heat shock for 30 min at 42°C. The transformant produced by the above process was cultured for 48 hours and lysated. The cell lysate was applied directly to a glutathione column (Pharmacia Biotech) pre-equilibrated with 50 mM Tris-HCl (pH 8.0) with treatment of thrombin (Sigma), and proteins bound to glutathione beads were eluted with a glutathione in 50 mM Tris-HCl (pH 8.0). The fraction containing recombinant KGF-2A was subsequently applied to a Heparin column (Pharmacia Biotech). The recombinant KGF-2A was eluted with a linear gradient of 0-2.0 M NaCl in 50 mM Tris-HCl (pH 8.0). Then, the recombinant KGF-2A fraction was dialyzed overnight against phosphate-buffered saline and subsequently applied to PyroSep-C (Tanabe Pharmaceuticals, Japan) for removal of endotoxin. The apparent molecular mass of KGF-2A identified by running it on agarose gel was approximately 20 kDa and that of GST- KGF2A was 45 kDa, consistent with the predicted molecular weight (see Fig. 2). EXAMPLE 6 Determination of Mitogenic Activity of Recombinant KGF -2 A Isolated human hair-follicles are maintained in individual wells of 24-well multiwell plates containing 1ml of KBM media (Clonetics) supplemented with lOOU/ml penicillin, 10 ng/ml hydrocortisone, 75 μg/ml bovine pituitary extract in an atmosphere of 5% CO 2 /95% air. The cell growth of hair-follicles was measured by colorimetric MTS assays. Precisely, KGF-2A was treated to the above human hair-follicles as different concentrations of 10, 30 and 100 ng/ml for forty-eight hour before measuring MTS assay. At this time, KGF-2A produced in Example 4 was utilized. Single hair-follicle was then plated in a 96-well microtiter per well, and proliferation was measured 4 h later using a colorimetric MTS assay according to the manufacturer's suggestions (Promega). In each experiment, observations (n = 8 hair- follicles per group) were performed and the values are reported as mean ± standard eoor (S.E.). In the proliferation assay, the negative control was evaluated using untreated hair-follicle cells. As seen in fig. 5, the addition of KGF-2 A resulted in dose-dependent of stimulation of human hair-follicle cells with the maximum stimulatory effect of 30ng/ml. EXAMPLE 7 Determination for molecular mechanism of KGF-2 A activity Like tooth or feather-bud development, hair-follicle morphogenesis is governed by epithelial-mesenchymal interactions, between hair placode keratinocytes and fibroblasts of underlying mesenchymal condensations. Accordingly, it is intended that molecular mechanism of KGF-2A activity should be suggested by assessing the effects of administration of KGF-2A on hair-follicle cell proliferation in organ culture. Further, since KGF-2 exists in human hair-follicles from normal people, it is intended to exclude affect by an endogenous KGF-2 from dermal papilla. That is, KGF- 2A was treated into the culture media containing human hair-follicles from normal person in which dermal papilla were removed surgically. Interestingly, as shown in Fig. 6A and 6B, KGF-2A stimulate DP-deleted hair- follicle cells with the increased percentage of 135% ± 11.1 (PO.05) cell proliferation compared to DP-containing hair-follicle cells (125% ± 11.0). EXAMPLE 8 Comparison of stimulatory activities between KGF-1, KGF-2 and KGF-2 A Human hair-follicle cells derived from scalp skin were treated with KGF-1, KGF - 2 and KGF-2A respectively and after a lapse of some hours, their proliferation rate was measured by colorimetric MTS assays. Further, human hair-follicles, in which dermal papilla were removed surgically to exclude affect by endogenous KGF-2, were treated with KGF-1, KGF-2 and KGF-2 A respectively. As a result, KGF-2A stimulated significantly human hair-follicle cells derived from alopecia patient's scalp by 135% ± 7.8 compared to 126% ± 8.6 of KGF-2 and 112% ± 6.9 of KGF-1 as shown in Fig 7A. The significantly stimulatory effect of KGF-2A was also shown in human DP-deleted hair-follicle cells from alopecia patient's scalp by 121% ± 13.0(Fig.7B). [Industrial Applicability] As noted in the foregoing discussing, the KGF-2A of the present invention is a mutant form of KGF-2, wherein KGF-2A comprises an amino acid sequence with substitution of Glu for Lys at the 87 l codon of that of KGF-2 and can be isolated from hair follicles of human scalp skin. Especially, the KGF-2A of the present invention has a characteristic of its reduced expression in hair follicles derived from alopecia patients and shows its stimulatory effect on hair-follicle cell proliferation. Therefore, KGH-2A can be used to prevent or treat alopecia and to promote or accelerate hair growth and hair- follicle repair. 11UUΛ H « > -| ll ll' Λ TV ON TtlP INTDHNAIiONΛL HU K.M I KIN OP 1111" r» ) M1 op MicnoonϋANib b 1-oκ i HI-: 1'iικwι-ιP OP IΆTΠNΓ iiiocmn j ur, INTERNATIONAL 1'ORM RECEIPT IN THE CASE OF AN ORIGINAL DEPOSIT issued pursuant to Itulu 7.1 ' lO KTM, Scogyun Unction TVD 4FL. Hl'ζj M, ( ÷hunpidaπi-donβ, Kangn.irn-Uu, Swiul 135100, lieμublif of Korea iυiϊNJIFIC'ΛTK ) N OF THF, MICROORGANISM Accession number KIVPΠ bv the Identification r cieπ t: yiven by the INTERNATIONAL UEPOSI I ' AKY DEPOSITOR AUItr RITY p(ΪEM-T-KGl'-2A KCTC 1012BP U SCIENTIFIC nKSCKll'lrON ΛNn/OK PROPOSED TΛXONOMIC DESIGN A I ION t e inn MidiKiiiisiii ideniiiied under I above was ««c(irri|Mrmid by [ x ] a scientific description I 1 a pioμoscd taxonomu designation ( dik with a πoss applicable) HI RK I IP I AND ΛICEP ' I ANCK I his International Depositary Λuthoπty accepts the mu roorjanιsnι identified undfi I above, v/hiHi w.is received b\ it on Ma 19 2001. 'V KliLliU'l OF RFQUIC l FOR CONVERSION e iiiic-rooipanisai identified under I above was received by this Incei national Dcpobitaiv Λuihoπly on and ;ι equest to conveit the ouuinal deposil lo a dqxisit undci thf Budapest Iπ^i W icceived by it on V INTERNATIONAL DEPOSITARY AUTHORITY Name Korean Collection for Type Cultures SικnuUιre(b) of μcrsonfs) havmp the [KIWIΓ to lepresenl the International Ueposi n y Authority of authorised ufficiaKs) Λddicss Koiea Research Institute of Biυsc l ru c and Biotechnology ( RIBB) #!)2, Ouii- oiiR. Yuson ltu, iaejori 30fι 333, BAE, Kyuπg Souk, Diicetot Republic of Korea Il.ii - May 23 2001

Claims: [Claims] [Claim 1] A KGF-2A comprising an amino acid sequence which is substituted Glu for Lys at the 87 th codon of the amino acid sequence of KGF-2. [Claim 2] A KGF-2A comprising 40 th to 208 th amino acids of SEQ ID NO:l. [Claim 3] The KGF-2A according to claim 2, further comprising a Met residue at the N- terminus of said amino acid sequence. [Claim 4] A KGF-2A comprising 2 nd to 208 th amino acids of SEQ ID NO:l. [Claim 5] The KGF-2A according to claim 4, further comprising a Met residue at the N- terminus of said amino acid sequence. [Claim 6] The KGF-2A according to claim 2 or 4, which is derived from hair-follicles of human scalp skin. [Claim 7] The KGF-2 A according to any of claim 1 to 6, which is mature protein. [Claim 8] A kgf-2a gene encoding the KGF-2A of claim 1. [Claim 9] A kgf-2a gene encoding 2 nd to 208 th amino acids of SEQ ID NO:l. [Claim 10] The kgf-2a gene according to claim 9, comprising 4 th to 627 th nucleotides of SEQ ID NO:2. [Claim 11 ] A kgf-2a gene encoding 1 st to 208 th amino acids of SEQ ID NO:l. [Claim 12] The kgf-2a gene according to claim 11, comprising 1 st to 627 th nucleotides of SEQ ID NO:2. [Claim 13] A kgf-2a gene encoding 40 th to 208 th amino acids of SEQ ID NO:l. [Claim 14] The kgf-2a gene according to claim 13, comprising 118 th to 627 th nucleotides of SEQ ID NO:2. [Claim 15] th th A kgf-2a gene encoding amino acid sequence which comprises 40 to 208 amino acids of SEQ ID NO:l and further comprises a Met residue at N-terminus of said amino acid sequence. [Claim 16] The kgf-2a gene according to claim 15, comprising 118 th to 627 th nucleotides of SEQ ID NO:2 and further comprising an initiation codon at 5 '-end of said nucleotide sequence. [Claim 17] The kgf-2a gene according to any of claim 8 to 16, which is a cDNA type. [Claim 18] The kgf-2a gene according to any of claim 8 to 16, which is a gDNA type. [Claim 19] A method of producing KGF-2A, comprising subcloning kgf-2a gene to a vector, transforming a host cell with said vector and culturing said transformant. [Claim 20] The method according to claim 19, wherein the kgf-2a gene encodes an amino acid sequences which is substituted Glu for Lys at the 87 th codon of the amino acid sequence of KGF-2. [Claim 21] The method according to claim 19, wherein the kgf-2a gene encodes 1 st to 208 th amino acids of SEQ ID NO: 1. [Claim 22] The method according to claim 19, wherein the kgf-2a gene encodes 40 th to 208 th amino acids of SEQ ID NO:l. [Claim 23] The method according to claim 19, wherein the kgf-2 a gene comprises part or all of nucleotide sequence of SEQ ID NO:2 and further comprises an additional DNA sequences. [Claim 24] A pharmaceutical composition containing KGF-2A or its gene as an effective component for preventing or treating alopecia, or for promoting or accelerating hair growth and hair-follicle repair. [Claim 25] The pharmaceutical composition according to claim 24, wherein the KGF-2A comprises 40 th to 208 th amino acids of SEQ ID NO:l. [Claim 26] The pharmaceutical composition according to claim 24, wherein the KGF-2A comprises 2 nd to 208 th amino acids of SEQ ID NO:l. [Claim 27] The pharmaceutical composition according to claim 25 or 26, wherein the KGF- 2A further comprises a Met residue at the N-terminus of said amino acid sequence. [Claim 28] The pharmaceutical composition according to claim 24, wherein the KGF-2A is mature protein. [Claim 29] The pharmaceutical composition according to claim 24, wherein the kgf-2a gene encodes 2 nd to 208 th amino acids of SEQ ID NO:l. [Claim 30] The pharmaceutical composition according to claim 24, wherein the kgf-2a gene encodes 40 th to 208 th amino acids of SEQ ID NO: 1. [Claim 31] The pharmaceutical composition according to claim 24, wherein the kgf-2a gene comprises part or all of nucleotide sequence of SEQ ID NO:2 and further comprises an additional DNA sequences. [Claim 32] A method for preventing or treating alopecia with a KGF-2A or its gene. [Claim 33] The method according to claim 32, comprising administering a pharmaceutical composition which contains KGF-2A or its gene as an effective component on patient's scalp skin by transdermal. [Claim 34] A method for promoting or accelerating hair growth and hair-follicle repair with KGF-2A or its gene.

Inventors: KIM SOOGYUN, SEOL KYEOUNGSOO, KIM, SOOGYUN, SEOL, KYEOUNGSOO
Applicants: HUMAN DNA TECHNOLOGY INC, KIM SOOGYUN, SEOL KYEOUNGSOO, HUMAN DNA TECHNOLOGY INC., KIM, SOOGYUN, SEOL, KYEOUNGSOO
Application year: 2001
Main classification: C07K14
IPC codes: A61K8, A61K38, A61K48, A61P17, A61Q5, A61Q7, C07K14, C12N15, C12P21