| PATENT ASSIGNEE'S COUNTRY | USA |
| PATENT NUMBER | This data is not available for free |
| PATENT GRANT DATE | 13.06.2000 |
| PATENT TITLE |
Human chemotactin protein |
| PATENT ABSTRACT |
A human chemotactic polypeptide, DNA (RNA) encoding it, and a procedure for producing such a polypeptide by recombinant techniques are disclosed. Also disclosed are methods of using the polypeptide for a number of purposes, including: stem cell mobilization, myeloprotection, neuronal protection, treating tumors, wound healing, treating parasitic infection, and regulating hematopoiesis. Also disclosed are polypeptide antagonists and diagnostic assays for identifying mutations in nucleic acid sequence encoding a polypeptide of the present invention and for detecting altered levels of the polypeptide of the present invention for detecting diseases are also disclosed. |
| PATENT INVENTORS | This data is not available for free |
| PATENT ASSIGNEE | This data is not available for free |
| PATENT FILE DATE | March 20, 1998 |
| PATENT REFERENCES CITED |
Forssmann, U., et al., "Eotaxin-2, a Novel CC Chemokine that Is Selective for the Chemokine Receptor CCR3, and Acts Like Eotaxin on Human Eosinophil and Basophil Leukocytes," J. Exp. Med. 185:2171-2176 (Jun. 1997). Gong, J.-H., and Clark-Lewis, I., "Antagonists of Monocyte Chemoattractant Protein 1 Identified by Modification of Functionally Critical NH.sub.2 -terminal Residues," J. Exp. Med. 181:631-640. (Feb. 1995). Gong, J.-H., et al., "RANTES and MCP-3 Antagonists Bind Multiple Chemokine Receptors," J. Biol. Chem. 271:10521-10527 (May 1996). Bowie et al., Science 247:1306-1310, 1990. Wells, Biochemistry 29:8509-8517, 1990. Ngo et al., The Protein Folding Problem and Tertiary Structure Prediction, Merz et al., eds., Birkhauser, Boston, pp. 492-495, 1994. Schulz et al., Principles of Protein Structure, Springer-Verlag, New York, pp. 14-16, 1979. George et al., Macromolecular Sequencing and Synthesis: Selected Methods and Applications, Schlesinger, ed., Alan R. Liss Inc., New York, pp. 127-149, 1988. Daniel et al., Virology 202:540-549, 1994. Beall, C.J. et al., "Conversion of Monocyte Chemoattractant Protein-1 into a Neutrophil Attractant by Substitution of Two Amino Acids," J. Biol. Chem. 267:3455-3459 (1992). Bischoff, S.C. et al., "Monocyte Chemotactic Protein 1 Is a Potent Activator of Human Basophils," J. Exp. Med. 175:1271-1275 (1992). Bottazzi, B. et al., "A chemoattractant expressed in human sarcoma cells (tumor-derived chemotactic factor, TDCF) is identical to monocyte chemoattractant protein-1/monocyte chemotactic and activating factor (MCP-1/MCAF)," Int. J. Cancer 45:795-797 (1990). Bowie, J.U. et al., "Deciphering the Message in Protein Sequences: Tolerance to Amino Acid Substitutions," Science 247:1306-1310 (1990). Brieland, J.K. et al., "Effect of Acute Inflammatory Lung Injury on the Expression of Monocyte Chemoattractant Protein-1 (MCP-1) in Rat Pulmonary Alveolar Macrophages," Am. J. Respir. Cell Mol. Biol. 7:134-139 (1992). Brieland, J.K. et al., "Expression of Monocyte Chemoattractant Protein-1 (MCP-1) by Rat Alveolar Macrophages during Chronic Lung Injury," Am. J. Respir. Cell Mol. Biol. 9:300-305 (1993). Brown, Z. et al., "IL-1 receptor antagonist inhibits monocyte chemotactic peptide-1 generation by human mesangial cells," Kidney Int. 42:95-101 (1992). Colditz, I. et al., "In Vivo Inflammatory Activity of Neutrophil-Activating Factor, a Novel Chemotactic Peptide Derived from Human Monocytes," Am. J. Pathology 134(4):755-760 (1989). Decock, B. et al., "Identification of the Monocyte Chemotactic Protein from Human Osteosarcoma Cells and Monocytes Detection of a Novel N-Terminally Processed Form," Biochem. Biophys. Res. Comm. 167(3):904-909 (1990). Furutani, Y. et al., "Cloning and Sequencing of the cDNA for Human Monocyte Chemotactic and Activating Factor (MCAF)," Biochem. Biophys. Res. Comm. 159(1):249-255 (1989). Gronenborn, A.M. and G.M. Clore, "Modeling the three-dimensional structure of the monocyte chemo-attractant and activating protein MCAF/MCP-1 on the basis of the solution structure of interleukin-8," Prot. Engin. 4(3):263-269 (1991). Jose, P.J. et al., "Eotaxin: A Potent Eosinophil Chemoattractant Cytokine Detected in a Guinea Pig Model of Allergic Airways Inflammation," J. Exp Med. 179:881-887 (1994). Kao, J. et al., "Endothelial Monocyte-activating Polypeptide II," J. Biol. Chem. 267(28):20239-20247 (1992). Kawahara, R.S. and T.F. Deuel, "Platelet-derived Growth Factor-inducible Gene JE Is a Member of a Family of Small Inducible Genes Related to Platelet Factor 4," J. Biol. Chem. 264(2):679-682 (1989). Koch, A.E. et al., "Enhanced Production of Monocyte Chemoattractant Protein-1 in Rheumatoid Arthritis," J. Clin. Invest. 90:772-779 (1992). Kuna, P. et al., "Monocyte Chemotactic and Activating Factor Is a Potent Histamine-releasing Factor for Human Basophils," J. Exp. Med. 175:489-493 (1992). Matsushima, K. et al., "Molecular Cloning of a Human Monocyte-Derived Neutrophil Chemotactic Factor (MDNCF) and the Induction of MDNCF mRNA by Interleukin 1 and Tumor Necrosis Factor," J. Exp. Med. 167(6):1883-1893 (1988). Matsushima, K. et al., "Purification and Characterization of a Novel Monocyte Chemotactic and Activating Factor Produced by a Human Myelomonocytic Cell Line," J. Exp. Med. 169:1485-1490 (1989). Mehrabian, M. et al., "Localization of Monocyte Chemotactic Protein-1 Gene (SCYA2) to Human Chromosome 17q11.2-q21.1," Genomics 9:200-203 (1991). Minty, A. et al., "Molecular cloning of the MCP-3 chemokine gene and regulation of its expression," Eur. Cytokine Netw. 4:99-110 (1993). Morgan, J.G. et al., "Cloning of the cDNA For The Serine Protease Homolog CAP37/Azurocidin, A Microbicidal and Chemotactic Protein from Human Granulocytes," J. Immunol. 147(9):3210-3214 (1991). Nelken, N.A. et al., "Monocyte Chemoattractant Protein-1 in Human Atheromatous Plaques," J. Clin. Invest. 88:1121-1127 (1991). Ngo, J.T. et al., "Computational Complexity, Protein Structure Prediction, and the Levinthal Paradox," In: The Protein Folding Problem and Tertiary Structure Prediction, Merz, Jr., K. and Le Grand, S., eds., Birkhauser, Boston, MA, pp. 491-495 (1994). Opdenakker, G. et al., "Human monocyte chemotactic protein-3 (MCP-3): molecular cloning of the cDNA and comparison with other chemokines," Biochem. Biophys. Res. Comm. 191(2):535-542 (1993). Pereira, H.A. et al., "CAP37, a Human Neutrophil-derived Chemotactic Factor with Monocyte Specific Activity," J. Clin. Invest. 85:1468-1476 (1990). Ransohoff, R.M. et al., "Astrocyte expression of mRNA encoding cytokines IP-10 and JE/MCP-1 in experimental autoimmune encephalomyelitis," FASEB J. 7(6):592-600 (1993). Robinson, E.A. et al., "Complete amino acid sequence of a human monocyte chemoattractant, a putative mediator of cellular immune reactions," Proc. Natl. Acad. Sci. USA 86:1850-1854 (1989). Rolfe, M.W. et al., "Expression and regulation of human pulmonary fibroblast-derived monocyte chemotactic peptide-1," Am. J. Physiology 263(5):L536-L545 (1992). Rollins, B.J. et al., "Cloning and expression of JE, a gene inducible by platelet-derived growth factor and whose product has cytokine-like properties," Proc. Natl. Acad. Sci. USA 85:3738-3742 (1988). Rollins, B.J. et al., "The Human Homolog of the JE Gene Encodes a Monocyte Secretory Protein," Mol. Cell. Biol. 9(11):4687-4695 (1989). Rudinger, J., "Characteristics of the amino acids as components of a peptide hormone sequence," In: Peptide Hormones, Parsons, J.A., ed., University Park Press, Baltimore, MD, pp. 1-7 (1976). Russell, M.E. et al., "Early and persistent induction of monocyte chemoattractant protein 1 in rat cardiac allografts," Proc. Natl. Acad. Sci. USA 90:6086-6090 (1993). Sacerdote, P. et al., "Cholecystokinin and the Immune System: Receptor-Mediated Chemotaxis of Human and Rat Monocytes," Peptides 9(suppl. 1):29-34 (1988). Schall, T.J., "Biology Of The RANTES/SIS Cytokine Family," Cytokine 3(3):165-183 (1991). Shyy, Y.-J. et al., "Structure of Human Monocyte Chemotactic Protein Gene and Its Regulation by TPA," Biochem. Biophys. Res. Comm. 169(2):346-351 (1990). Strieter, R.M. et al., "Disparate Gene Expression of Chemotactic Cytokines by Human Mononuclear Phagocytes," Biochem. Biophys. Res. Comm. 166(2):886-891 (1990). Van Damme, J. et al., "Production and identification of natural monocyte chemotactic protein from virally infected murine fibroblasts: Relationship with the product of the mouse competence (JE) gene," Eur. J. Biochem. 199(1):223-229 (1991). Van Damme, J. et al., "Structural and Functional Identification of Two Human, Tumor-derived Monocyte Chemotactic Proteins (MCP-2 and MCP-3) Belonging to the Chemokine Family," J. Exp. Med. 176:59-65 (1992). Villiger, P.M. et al., "Monocyte Chemoattractant Protein-1 (MCP-1) Expression in Human Articular Cartilage," J. Clin. Invest. 90(2):488-496 (1992). Wells, J.A., "Additivity of Mutational Effects in Proteins," Biochem. 29:8509-8517 (1990). Wempe, F. et al., "Gene Expression and cDNA Cloning Identified a Major Basic Protein Constituent of Bovine Seminal Plasma as Bovine Monocyte-Chemoattractant Protein-1 (MCP-1)," DNA and Cell Biol. 10(9):671-679 (1991). Yoshimura, T. et al., "Human monocyte chemoattractant protein-1 (MCP-1): Full-length cDNA cloning, expression in mitogen-stimulated blood mononuclear leukocytes, and sequence similarity to mouse competence gene JE," FEBS Letters 244(2):487-493 (1989). Yoshimura, T. and Yuhki, N., "Neutrophil Attractant/Activation Protein-1 And Monocyte Chemoattractant Protein-1 In Rabbit," J. Immunol. 146(10):3483-3488 (1991). Yoshimura, T. et al., "Molecular Cloning of Rat Monocyte Chemoattractant Protein-1 (MCP-1) and Its Expression In Rat Spleen Cells and Tumor Cell Lines," Biochem. Biophys. Res. Comm. 174(2):504-509 (1991). WPI Accession No. 92-185765, English Language Abstract of EP 0 488 900 (Document AN1). Marston,F.A.O., "The purification of eukaryotic polypeptides synthesized in Escherichia coli," Biochem J. 240:1-12 (1986). |
| PATENT PARENT CASE TEXT | This data is not available for free |
| PATENT CLAIMS |
What is claimed is: 1. An isolated polypeptide comprising 30 or more contiguous amino acids of SEQ ID NO:2. 2. The isolated polypeptide of claim 1, which comprises 50 or more contiguous amino acids of SEQ ID NO:2. 3. The isolated polypeptide of claim 1, which is produced in a recombinant host cell. 4. The isolated polypeptide of claim 2, which is produced in a recombinant host cell. 5. The isolated polypeptide of claim 1, wherein said polypeptide exhibits at least one of the following activities: (a) inhibits growth or differentiation of high proliferative potential colony forming cells (HPP-CFC) in vitro; or (b) increases the frequency of hematopoietic progenitor cells in peripheral blood when injected intraperitoneally or intravenously into a mouse. 6. The isolated polypeptide of claim 2, wherein said polypeptide exhibits at least one of the following activities: (a) inhibits growth or differentiation of high proliferative potential colony forming cells (HPP-CFC) in vitro; or (b) increases the frequency of hematopoietic progenitor cells in peripheral blood when injected intraperitoneally or intravenously into a mouse. 7. The isolated polypeptide of claim 1, further comprising a heterologous polypeptide. 8. The isolated polypeptide of claim 2, further comprising a heterologous polypeptide. 9. A composition comprising the isolated polypeptide of claim 1 and a pharmaceutically acceptable carrier. 10. A composition comprising the isolated polypeptide of claim 2 and a pharmaceutically acceptable carrier. 11. An isolated polypeptide comprising an amino acid sequence encoded by a polynucleotide which hybridizes in 0.5 M NaPO.sub.4, 7% SDS at 65.degree. C. followed by washing at 60.degree. C. in 0.5.times.SSC, 0.1% SDS to the complement of a nucleic acid encoding SEQ ID NO:2 or the complement of a nucleic acid encoding the protein encoded by the cDNA clone in ATCC Deposit No. 75703; wherein said polypeptide exhibits at least one of the following two activities: (a) inhibits growth or differentiation of high proliferative potential colony forming cells (HPP-CFC) in vitro; or (b) increases the frequency of hematopoietic progenitor cells in peripheral blood when injected intraperitoneally or intravenously into a mouse. 12. The isolated polypeptide of claim 11, wherein the Cys residues at positions 7, 8, 32 and 48 of SEQ ID NO:2 are conserved. 13. The isolated polypeptide of claim 11, wherein said polynucleotide hybridizes in 0.5 M NaPO.sub.4, 7% SDS at 65.degree. C. followed by washing at 60.degree. C. in 0.5.times.SSC, 0.1% SDS to the complement of SEQ ID NO:1 or the complement of the coding region of the cDNA clone in ATCC Deposit No. 75703. 14. An isolated polypeptide comprising, except for at least one amino acid substitution, an amino acid sequence identical to a member selected from the group consisting of: (a) amino acids -26 to 93 of SEQ ID NO:2; (b) amino acids -25 to 93 of SEQ ID NO:2; (c) amino acids 1 to 93 of SEQ ID NO:2; and (d) the amino acid sequence encoded by the cDNA clone in ATCC Deposit No. 75703; wherein said polypeptide exhibits at least one of the following two activities: (i) inhibits growth or differentiation of high proliferative potential colony forming cells (HPP-CFC) in vitro; or (ii) increases the frequency of hematopoietic progenitor cells in peripheral blood when injected intraperitoneally or intravenously into a mouse; and wherein said amino acid sequence is encoded by a polynucleotide which hybridizes in 0.5 M NaPO.sub.4, 7% SDS at 65.degree. C. followed by washing at 60.degree. C. in 0.5.times.SSC, 0.1% SDS to the complement of a nucleic acid encoding (a), (b), (c) or (d). 15. The isolated polypeptide of claim 14, wherein the Cys residues at positions 7, 8, 32 and 48 of SEQ ID NO:2 are conserved. 16. The isolated polypeptide of claim 14, wherein said polynucleotide hybridizes in 0.5 M NaPO.sub.4, 7% SDS at 65.degree. C. followed by washing at 60.degree. C. in 0.5.times.SSC, 0.1% SDS to the complement of SEQ ID NO:1 or the complement of the coding region of the cDNA clone in ATCC Deposit No. 75703. 17. An isolated polypeptide comprising a fragment of the amino acid sequence in SEQ ID NO:2 or a fragment of the amino acid sequence encoded by the cDNA clone in ATCC Deposit No. 75703, wherein said polypeptide exhibits at least one of the following two activities: (a) inhibits growth or differentiation of high proliferative potential colony forming cells (HPP-CFC) in vitro; or (b) increases the frequency of hematopoietic progenitor cells in peripheral blood when injected intraperitoneally or intravenously into a mouse. 18. An isolated polypeptide comprising a proprotein form of the protein encoded by the cDNA clone in ATCC Deposit No. 75703. 19. The isolated polypeptide of claim 18, comprising the full length protein encoded by the cDNA clone in ATCC Deposit No. 75703. 20. The isolated polypeptide of claim 11, which is produced in a recombinant host cell. 21. The isolated polypeptide of claim 14, which is produced in a recombinant host cell. 22. The isolated polypeptide of claim 17, which is produced in a recombinant host cell. 23. The isolated polypeptide of claim 18, which is produced in a recombinant host cell. 24. The isolated polypeptide of claim 11, further comprising a heterologous polypeptide. 25. The isolated polypeptide of claim 14, further comprising a heterologous polypeptide. 26. The isolated polypeptide of claim 17, further comprising a heterologous polypeptide. 27. The isolated polypeptide of claim 18, further comprising a heterologous polypeptide. 28. A composition comprising the isolated polypeptide of claim 11 and a pharmaceutically acceptable carrier. 29. A composition comprising the isolated polypeptide of claim 14 and a pharmaceutically acceptable carrier. 30. A composition comprising the isolated polypeptide of claim 17 and a pharmaceutically acceptable carrier. 31. A composition comprising the isolated polypeptide of claim 18 and a pharmaceutically acceptable carrier. |
| PATENT DESCRIPTION |
FIELD OF THE INVENTION This invention relates to newly identified polynucleotides, polypeptides encoded by such polynucleotides, the use of such polynucleotides and polypeptides, as well as the production of such polynucleotides and polypeptides. More particularly, the polypeptide of the present invention is a chemotactic protein. The invention also relates to inhibiting the action of such polypeptides. RELATED ART There are three forms of monocyte chemotactic protein, namely, MCP-1, MCP-2 and MCP-3. All of these proteins have been structurally and functionally characterized and have also been cloned and expressed. MCP-1 and MCP-2 have the ability to attract leukocytes (monocytes, and leukocytes), while MCP-3 also attracts eosinophils and T lymphocytes (Dahinderi, E. et al., J. Exp. Med., 179:751-756 (1994)). Initially, human monocyte-specific attracting factor, was purified from a glioma cell line and a monocytic cell line. Matsushima, K. et al, J. Exp. Med., 169:1485-1490 (1989). This factor was originally designated glioma-derived chemotactic factor (GDCF) and monocyte chemotactic and activating factor (MCAF) by Matsushima, et al. This factor is now referred to as MCP-1. Subsequent cloning of the cDNA for MCP-1 showed it to be highly similar to the murine JE gene. The JE gene could be massively induced in murine fibroblasts by platelet-derived growth factor. Cochran, B. H., et al, Cell 33:939-947 (1983). Murine JE is highly similar to MCP-1. The MCP-1 protein is 62% identical to murine JE in a region of 68 shared N-terminal residues. It is widely accepted that JE and MCP-1 are species homologs. A method of suppressing tumor formation in a vertebrate by administering JE/MCP-1 has been disclosed in PCT application WO-92/20372, along with methods of treating localized complications of malignancies and methods of combatting parasitic infection by administering JE/MCP-1. Expression of the JE/MCP-1 protein in malignant cells was found to suppress the cells ability to form tumors in vivo. Human MCP-1 is a basic peptide of 76 amino acids with a predicted molecular mass of 8,700 daltons. MCP-1 is inducibly expressed mainly in monocytes, endothelial cells and fibroblasts. Leonard, E. J. and Yoshimura, T., Immunol. Today, 11:97-101 (1990). The factors which induce this expression is IL-1, TNF or lipopolysaccharide treatment. Other properties of MCP-1 include the ability to strongly activate mature human basophils in a pertussis toxin-sensitive manner. MCP-1 is a cytokine capable of directly inducing histamine release by basophils, (Bischoff, S. C. et al., J. Exp. Med., 175:1271-1275 (1992)). Furthermore, MCP-1 promotes the formation of leukotriene C4 by basophils pretreated with Interleukin 3, Interleukin 5, or granulocyte/macrophage colony-stimulating factor. MCP-1 induced basophil mediator release may play an important role in allergic inflammation and other pathologies expressing MCP-1. Clones having a nucleotide sequence encoding a human monocyte chemotactic and activating factor (MCAF) reveal the primary structure of the MCAF polypeptide to be composed of a putative signal peptide sequence of 23 amino acid residues and a mature MCAF sequence of 76 amino acid residues. Furutani, Y. H., et al, Biochem. Biophys. Res. Commu., 159:249-55 (1989). The complete amino acid sequence of human glioma-derived monocyte chemotactic factor (GDCF-2) has also been determined. This peptide attracts human monocytes but not neutrophils. It was established that GDCF-2 comprises 76 amino acid residues. The peptide chain contains 4 half-cysteines, at positions 11, 12, 36 and 52, which create a pair of loops, clustered at the disulfide bridges. Further, the MCP-1 gene has been designated to human chromosome 17. Mehrabian, M. R., et al, Genomics, 9:200-3 (1991). Certain data suggests that a potential role for MCP-1 is mediating monocytic infiltration of the artery wall. Monocytes appear to be central to atherogenesis both as the progenitors of foam cells and as a potential source of growth factors mediating intimal hyperplasia. Nelken, N. A., et al, J. Clin. Invest., 88:1121-7 (1991). It has also been found that synovial production of MCP-1 may play an important role in the recruitment of mononuclear phagocytes during inflammation associated with rheumatoid arthritis and that synovial tissue macrophages are the dominant source of this cytokine. MCP-1 levels were found to be significantly higher in synovial fluid from rheumatoid arthritis patients compared to synovial fluid from osteoarthritis patients or from patients with other arthritides. Koch, A. E., et al, J. Clin. Invest., 90:772-9 (1992). MCP-2 and MCP-3 are classified in a subfamily of proinflammatory proteins and are functionally related to MCP-1 because they specifically attract monocytes, but not neutrophils. Van Damme, J., et al, J. Exp. Med., 176:59-65 (1992). MCP-3 shows 71% and 58% amino acid homology to MCP-1 and MCP-2 respectively. MCP-3 is an inflammatory cytokine that regulates macrophage functions. The transplantation of hemolymphopoietic stem cells has been proposed in the treatment of cancer and hematological disorders. Many studies demonstrate that transplantation of hematopoietic stem cells harvested from the peripheral blood have advantages over the transplantation of marrow-derived stem cells. Due to the low number of circulating stem cells, there is a need for induction of pluripotent marrow stem cell mobilization into the peripheral blood. Reducing the amount of blood to be processed to obtain an adequate amount of stem cells would increase the use of autotransplantation procedures and eliminate the risk of graph versus host reaction connected with allotransplantation. Presently, blood mobilization of marrow CD34.sup.+ stem cells is obtained by the injection of a combination of agents, including antiblastic drugs and G-CSF or GM-CSF. Drugs which are capable of stem cell mobilization include IL-1, IL-7, IL-8, and NIP-1.alpha.. Both IL-1 and IL-8 demonstrate proinflammatory activity that may be dangerous for good engrafting. IL-7 must be administered at high doses over a long duration and MIP-1.alpha. is not very active as a single agent and shows best activity when in combination with G-CSF. SUMMARY OF THE INVENTION In accordance with one aspect of the present invention, there is provided a novel mature polypeptide, as well as biologically active and diagnostically or therapeutically useful fragments, analogs and derivatives thereof. The polypeptide of the present invention is of human origin. In accordance with another aspect of the present invention, there are provided isolated nucleic acid molecules encoding a polypeptide of the present invention including mRNAs, DNAs, cDNAs, genomic DNAs as well as analogs and biologically active and diagnostically or therapeutically useful fragments thereof. In accordance with yet a further aspect of the present invention, there is provided a process for producing such polypeptide by recombinant techniques comprising culturing recombinant prokaryotic and/or eukaryotic host cells, containing a nucleic acid sequence encoding a polypeptide of the present invention, under conditions promoting expression of said protein and subsequent recovery of said protein. In accordance with yet a further aspect of the present invention, there is provided a process for utilizing such polypeptide, or polynucleotide encoding such polypeptide for therapeutic purposes, for example, for stem cell mobilization, myeloprotection and neuronal protection, to treat tumors, to promote wound healing, to combat parasitic infection and to regulate hematopoiesis. In accordance with yet a further aspect of the present invention, there are provided antibodies against such polypeptides. In accordance with another aspect of the present invention, there are provided agonists which mimic the polypeptide of the present invention and bind to receptors to elicit second messenger responses. In accordance with yet another aspect of the present invention, there are provided antagonists to such polypeptides, which may be used to inhibit the action of such polypeptides, for example, in the treatment of rheumatoid arthritis, lung inflammation, allergy, infectious diseases and to prevent inflammation and atherosclerosis. In accordance with yet a further aspect of the present invention, there is also provided nucleic acid probes comprising nucleic acid molecules of sufficient length to specifically hybridize to a nucleic acid sequence of the present invention. In accordance with still another aspect of the present invention, there are provided diagnostic assays for detecting diseases or susceptibility to diseases related to mutations in the nucleic acid sequences encoding a polypeptide of the present invention. In accordance with yet a further aspect of the present invention, there is provided a process for utilizing such polypeptides, or polynucleotides encoding such polypeptides, for in vitro purposes related to scientific research, for example, synthesis of DNA and manufacture of DNA vectors. These and other aspects of the present invention should be apparent to those skilled in the art from the teachings herein. BRIEF DESCRIPTION OF THE FIGURES The following drawings are illustrative of embodiments of the invention and are not meant to limit the scope of the invention as encompassed by the claims. FIG. 1 depicts the cDNA (SEQ ID NO:1) sequence and corresponding deduced amino acid sequence (SEQ ID NO:2) of a chemotactic protein of the present invention (CP). The 119 amino acid sequence shown is the full length protein, with approximately the first 26 amino acids representing a leader sequence (underlined) such that the mature form of the protein is 93 amino acids in length. The standard one letter abbreviation for amino acids is used. FIG. 2 illustrates a comparison of the amino acid sequence homology between the polypeptide of the present invention (SEQ ID NO:2), MCP-1 (SEQ ID NO:5) and MIP-1.alpha. (SEQ ID NO:6). The polypeptide of the present invention (CP) shows 39% homology with MIP-1.alpha. and 34% homology with MCP-1. FIG. 3 illustrates the chemotactic activity of the polypeptide of the present invention on neutrophils (PMN) and peripheral blood mononuclear cells (PBMC). Neutrophils and peripheral blood mononuclear cells were isolated from peripheral blood, loaded with calcein-AM and used for chemotaxis in a 96 well, single-use Neuroprobe chemotactic chamber. After 90 minutes incubation with the polypeptide of the present invention (CP), the chamber was dismounted, the filter air-dried and the number of cells which migrated through the membrane quantitated in a cytofluor II. FIGS. 4A and 4B illustrates that the polypeptide of the present invention (CP) inhibits the growth and differentiation of high proliferative potential colony forming cells (HPP-CFC) (A) and is not effective on low proliferative potential colony forming cells (LPP-CFC) (B). In these experiments, 1,500 cells from low density, non-adherent bone marrow cells were plated in agar-medium supplemented with 5 ng/ml mouse IL-3, 100 ng/ml mouse SCF, 10 ng/ml mouse IL-1.alpha., 5 ng/ml human M-CSF, and with or without the indicated concentrations of the polypeptide of the present invention (CP). Colonies were scored after 14 days of incubation. Three experiments were performed. The results are presented as mean number of colonies .+-.SD. An irrelevant protein had no effects. FIGS. 5A and 5B shows the effect of the polypeptide of the present invention (CP) on bone marrow cells which were enriched in the primitive Lin-cells by removing committed precursor cells (antibodies anti-CD11b, CD4, CD8, CD45R and Gr.-1). The panel A shows ratios .+-.SD of LPP-CFC/HPP-CFC in the bone marrow cells (column 1) or Lin- cells (column 2) plated in agar-medium with 5 ng/ml IL-3, 100 ng/ml SCF, 10 ng/ml IL-1.alpha., 5 ng/ml M-CSF. Columns 3, 4 and 5 show the ratio of LPP-CFC/HPP-CFC found in the Lin-cells that were cultured with 5 ng/ml IL-3 and 100 ng/ml SCF (column 3), IL-3, SCF and 50 ng/ml of the polypeptide of the present invention (CP) (column 4) or IL-3, SCF and 50 ng/ml of an irrelevant protein (column 5). After 6 days, cultures were assayed for HPP-CFC and LPP-CFC. The panel B shows the cellularity after 6 days incubation. FIG. 6 illustrates that the polypeptide of the present invention (CP) protects HPP-CFC but not LPP-CFC from the cytotoxic effect of cytosine arabinoside (Ara-C) in vitro. FIG. 7 illustrates that the polypeptide of the present invention (CP) protects HPP-CFC but not LPP-CFC from the cytotoxic effect of 5-Fluorouracil (5-FU) in vitro. FIG. 8 illustrates the effect of the polypeptide of the present invention (CP) and Basic FGF on Cortical Neuronal Survival. FIG. 9 shows a schematic representation of the pHE4a expression vector (SEQ ID NO:7). The locations of the kanamycin resistance marker gene, the multiple cloning site linker region, the oriC sequence, and the lacIq coding sequence are indicated. FIG. 10 shows the nucleotide sequence of the regulatory elements of the pHE4a promoter (SEQ ID NO:8). The two lac operator sequences, the Shine-Delgarno sequence (S/D), and the terminal HindIII and NdeI restriction sites (italicized) are indicated. DETAILED DESCRIPTION OF THE INVENTION In accordance with an aspect of the present invention, there is provided an isolated nucleic acid (polynucleotide) which encodes for the mature polypeptide having the deduced amino acid sequence of FIG. 1 (SEQ ID NO:2) or for the mature polypeptide encoded by the cDNA of the clone deposited at the American Type Culture Collection, 12301 Parklawn Drive, Rockville Md. 20852, as ATCC Deposit No. 75703 on Mar. 10, 1994. The polynucleotide of this invention was discovered from an activated monocyte cDNA library. It contains an open reading frame encoding a protein of approximately 119 amino acids in length of which the first 26 amino residues comprise a putative leader sequence. The mature protein therefore is predicted to be 93 amino acids in length. It is structurally related to mouse monocyte chemotactic protein (MCP-1 or JE), showing 27% identity, and 56% similarity over the entire human MCP-1 protein sequence. The polypeptide contains all four cysteine residues that occur in all chemokines in a characteristic motif. The spacing between these cysteines is conserved compared with the murine MCP-1/JE which strongly suggests that the new gene is a chemokine. The polynucleotide of the present invention may be in the form of RNA or in the form of DNA, which DNA includes cDNA, genomic DNA, and synthetic DNA. The DNA may be double-stranded or single-stranded, and if single stranded may be the coding strand or non-coding (anti-sense) strand. The coding sequence which encodes the mature polypeptide may be identical to the coding sequence shown in FIG. 1 (SEQ ID NO:1) or that of the deposited clone or may be a different coding sequence which coding sequence, as a result of the redundancy or degeneracy of the genetic code, encodes the same mature polypeptide as the DNA of FIG. 1 (SEQ ID NO:1) or the deposited cDNA. The polynucleotide which encodes for the mature polypeptide of FIG. 1 (SEQ ID NO:2) or for the mature polypeptide encoded by the deposited cDNA may include, but is not limited to: only the coding sequence for the mature polypeptide; the coding sequence for the mature polypeptide and additional coding sequence such as a leader or secretory sequence or a proprotein sequence; the coding sequence for the mature polypeptide (and optionally additional coding sequence) and non-coding sequence, such as introns or non-coding sequence 5' and/or 3' of the coding sequence for the mature polypeptide. Thus, the term "polynucleotide encoding a polypeptide" encompasses a polynucleotide which includes only coding sequence for the polypeptide as well as a polynucleotide which includes additional coding and/or non-coding sequence. The present invention further relates to variants of the hereinabove described polynucleotides which encode for fragments, analogs and derivatives of the polypeptide having the deduced amino acid sequence of FIG. 1 (SEQ ID NO:2) or the polypeptide encoded by the cDNA of the deposited clone. The variant of the polynucleotide may be a naturally occurring allelic variant of the polynucleotide or a non-naturally occurring variant of the polynucleotide. Thus, the present invention includes polynucleotides encoding the same mature polypeptide as shown in FIG. 1 (SEQ ID NO:2) or the same mature polypeptide encoded by the cDNA of the deposited clone as well as variants of such polynucleotides which variants encode for a fragment, derivative or analog of the polypeptide of FIG. 1 (SEQ ID NO:2) or the polypeptide encoded by the cDNA of the deposited clone. Such nucleotide variants include deletion variants, substitution variants and addition or insertion variants. As hereinabove indicated, the polynucleotide may have a coding sequence which is a naturally occurring allelic variant of the coding sequence shown in FIG. 1 (SEQ ID NO:1) or of the coding sequence of the deposited clone. As known in the art, an allelic variant is an alternate form of a polynucleotide sequence which may have a substitution, deletion or addition of one or more nucleotides, which does not substantially alter the function of the encoded polypeptide. The present invention also includes polynucleotides, wherein the coding sequence for the mature polypeptide may be fused in the same reading frame to a polynucleotide sequence which aids in expression and secretion of a polypeptide from a host cell, for example, a leader sequence which functions as a secretory sequence for controlling transport of a polypeptide from the cell. The polypeptide having a leader sequence is a preprotein and may have the leader sequence cleaved by the host cell to form the mature form of the polypeptide. The polynucleotides may also encode for a proprotein which is the mature protein plus additional 5' amino acid residues. A mature protein having a prosequence is a proprotein and is an inactive form of the protein. Once the prosequence is cleaved an active mature protein remains. Thus, for example, the polynucleotide of the present invention may encode for a mature protein, or for a protein having a prosequence or for a protein having both a prosequence and a presequence (leader sequence). The polynucleotides of the present invention may also have the coding sequence fused in frame to a marker sequence which allows for purification of the polypeptide of the present invention. The marker sequence may be a hexa-histidine tag supplied by a pQE-9 vector to provide for purification of the mature polypeptide fused to the marker in the case of a bacterial host, or, for example, the marker sequence may be a hemagglutinin (HA) tag when a mammalian host, e.g. COS-7 cells, is used. The HA tag corresponds to an epitope derived from the influenza hemagglutinin protein (Wilson, I., et al., Cell, 37:767 (1984)). The term "gene" means the segment of DNA involved in producing a polypeptide chain; it includes regions preceding and following the coding region (leader and trailer) as well as intervening sequences (introns) between individual coding segments (exons). Fragments of the full length gene of the present invention may be used as a hybridization probe for a cDNA library to isolate the full length cDNA and to isolate other cDNAs which have a high sequence similarity to the gene or similar biological activity. Probes of this type preferably have at least 30 bases and may contain, for example, 50 or more bases. The probe may also be used to identify a cDNA clone corresponding to a full length transcript and a genomic clone or clones that contain the complete gene including regulatory and promotor regions, exons, and introns. An example of a screen comprises isolating the coding region of the gene by using the known DNA sequence to synthesize an oligonucleotide probe. Labeled oligonucleotides having a sequence complementary to that of the gene of the present invention are used to screen a library of human cDNA, genomic DNA or mRNA to determine which members of the library the probe hybridizes to. The present invention further relates to polynucleotides which hybridize to the hereinabove-described sequences if there is at least 70%, preferably at least 90%, and more preferably at least 95% identity between the sequences. The present invention particularly relates to polynucleotides which hybridize under stringent conditions to the hereinabove-described polynucleotides. As herein used, the term "stringent conditions" means hybridization will occur only if there is at least 95% and preferably at least 97% identity between the sequences. The polynucleotides which hybridize to the hereinabove described polynucleotides in a preferred embodiment encode polypeptides which either retain substantially the same biological function or activity as the mature polypeptide encoded by the cDNAs of FIG. 1 (SEQ ID NO:1) or the deposited cDNA(s). Alternatively, the polynucleotide may have at least 20 bases, preferably 30 bases, and more preferably at least 50 bases which hybridize to a polynucleotide of the present invention and which has an identity thereto, as hereinabove described, and which may or may not retain activity. For example, such polynucleotides may be employed as probes for the polynucleotide of SEQ ID NO:1, for example, for recovery of the polynucleotide or as a diagnostic probe or as a PCR primer. Thus, the present invention is directed to polynucleotides having at least a 70% identity, preferably at least 90% and more preferably at least a 95% identity to a polynucleotide which encodes the polypeptide of SEQ ID NO:2 as well as fragments thereof, which fragments have at least 30 bases and preferably at least 50 bases and to polypeptides encoded by such polynucleotides. The deposit(s) referred to herein will be maintained under the terms of the Budapest Treaty on the International Recognition of the Deposit of Micro-organisms for purposes of Patent Procedure. These deposits are provided merely as convenience to those of skill in the art and are not an admission that a deposit is required under 35 U.S.C. .sctn.112. The sequence of the polynucleotides contained in the deposited materials, as well as the amino acid sequence of the polypeptides encoded thereby, are incorporated herein by reference and are controlling in the event of any conflict with any description of sequences herein. A license may be required to make, use or sell the deposited materials, and no such license is hereby granted. The present invention further relates to a polypeptide which has the deduced amino acid sequence of FIG. 1 (SEQ ID NO:2) or which has the amino acid sequence encoded by the deposited cDNA, as well as fragments, analogs and derivatives of such polypeptide. The terms "fragment," "derivative" and "analog" when referring to the polypeptide of FIG. 1 (SEQ ID NO:2) or that encoded by the deposited cDNA, means a polypeptide which retains essentially the same biological function or activity as such polypeptide. Thus, an analog includes a proprotein which can be activated by cleavage of the proprotein portion to produce an active mature polypeptide. The polypeptide of the present invention may be a recombinant polypeptide, a natural polypeptide or a synthetic polypeptide, preferably a recombinant polypeptide. The fragment, derivative or analog of the polypeptide of FIG. 1 (SEQ ID NO:2) or that encoded by the deposited cDNA may be (i) one in which one or more of the amino acid residues are substituted with a conserved or non-conserved amino acid residue (preferably a conserved amino acid residue) and such substituted amino acid residue may or may not be one encoded by the genetic code, or (ii) one in which one or more of the amino acid residues includes a substituent group, or (iii) one in which the mature polypeptide is fused with another compound, such as a compound to increase the half-life of the polypeptide (for example, polyethylene glycol), or (iv) one in which the additional amino acids are fused to the mature polypeptide, such as a leader or secretory sequence or a sequence which is employed for purification of the mature polypeptide or a proprotein sequence. Such fragments, derivatives and analogs are deemed to be within the scope of those skilled in the art from the teachings herein. The polypeptides and polynucleotides of the present invention are preferably provided in an isolated form, and preferably are purified to homogeneity. The term "isolated" means that the material is removed from its original environment (e.g., the natural environment if it is naturally occurring). For example, a naturally-occurring polynucleotide or polypeptide present in a living animal is not isolated, but the same polynucleotide or polypeptide, separated from some or all of the coexisting materials in the natural system, is isolated. Such polynucleotides could be part of a vector and/or such polynucleotides or polypeptides could be part of a composition, and still be isolated in that such vector or composition is not part of its natural environment. The polypeptides of the present invention include the polypeptide of SEQ ID NO:2 (in particular the mature polypeptide) as well as polypeptides which have at least 70% similarity (preferably at least 70% identity) to the polypeptide of SEQ ID NO:2 and more preferably at least 90% similarity (more preferably at least 90% identity) to the polypeptide of SEQ ID NO:2 and still more preferably at least 95% similarity (still more preferably at least 95% identity) to the polypeptide of SEQ ID NO:2 and also include portions of such polypeptides with such portion of the polypeptide generally containing at least 30 amino acids and more preferably at least 50 amino acids. As known in the art "similarity" between two polypeptides is determined by comparing the amino acid sequence and its conserved amino acid substitutes of one polypeptide to the sequence of a second polypeptide. Fragments or portions of the polypeptides of the present invention may be employed for producing the corresponding full-length polypeptide by peptide synthesis; therefore, the fragments may be employed as intermediates for producing the full-length polypeptides. Fragments or portions of the polynucleotides of the present invention may be used to synthesize full-length polynucleotides of the present invention. The present invention also relates to vectors which include polynucleotides of the present invention, host cells which are genetically engineered with vectors of the invention and the production of polypeptides of the invention by recombinant techniques. Host cells are genetically engineered (transduced or transformed or transfected) with the vectors of this invention which may be, for example, a cloning vector or an expression vector. The vector may be, for example, in the form of a plasmid, a viral particle, a phage, etc. The engineered host cells can be cultured in conventional nutrient media modified as appropriate for activating promoters, selecting transformants or amplifying the genes of the present invention. The culture conditions, such as temperature, pH and the like, are those previously used with the host cell selected for expression, and will be apparent to the ordinarily skilled artisan. The polynucleotides of the present invention may be employed for producing polypeptides by recombinant techniques. Thus, for example, the polynucleotide may be included in any one of a variety of expression vectors for expressing a polypeptide. Such vectors include chromosomal, nonchromosomal and synthetic DNA sequences, e.g., derivatives of SV40; bacterial plasmids; phage DNA; baculovirus; yeast plasmids; vectors derived from combinations of plasmids and phage DNA, viral DNA such as vaccinia, adenovirus, fowl pox virus, and pseudorabies. However, any other vector may be used as long as it is replicable and viable in the host. The appropriate DNA sequence may be inserted into the vector by a variety of procedures. In general, the DNA sequence is inserted into an appropriate restriction endonuclease site(s) by procedures known in the art. Such procedures and others are deemed to be within the scope of those skilled in the art. The DNA sequence in the expression vector is operatively linked to an appropriate expression control sequence(s) (promoter) to direct mRNA synthesis. As representative examples of such promoters, there may be mentioned: LTR or SV40 promoter, the E. coli. lac or trp, the phage lambda P.sub.L promoter and other promoters known to control expression of genes in prokaryotic or eukaryotic cells or their viruses. The expression vector also contains a ribosome binding site for translation initiation and a transcription terminator. The vector may also include appropriate sequences for amplifying expression. In addition, the expression vectors preferably contain one or more selectable marker genes to provide a phenotypic trait for selection of transformed host cells such as dihydrofolate reductase or neomycin resistance for eukaryotic cell culture, or such as tetracycline or ampicillin resistance in E. coli. The vector containing the appropriate DNA sequence as hereinabove described, as well as an appropriate promoter or control sequence, may be employed to transform an appropriate host to permit the host to express the protein. As representative examples of appropriate hosts, there may be mentioned: bacterial cells, such as E. coli, Streptomyces, Salmonella typhimurium; fungal cells, such as yeast; insect cells such as Drosophila S2 and Spodoptera Sf9; animal cells such as CHO, COS or Bowes melanoma; adenoviruses; plant cells, etc. The selection of an appropriate host is deemed to be within the scope of those skilled in the art from the teachings herein. In addition to the use of expression vectors in the practice of the present invention, the present invention further includes novel expression vectors comprising operator and promoter elements operatively linked to nucleotide sequences encoding a protein of interest. One example of such a vector is pHE4a which is described in detail below. As summarized in FIGS. 9 and 10, components of the pHE4a vector (SEQ ID NO:7) include: 1) a neomycinphosphotransferase gene as a selection marker, 2) an E. coli origin of replication, 3) a T5 phage promoter sequence, 4) two lac operator sequences, 5) a Shine-Delgarno sequence, 6) the lactose operon repressor gene (lacIq) and 7) a multiple cloning site linker region. The origin of replication (oriC) is derived from pUC19 (LTI, Gaithersburg, Md.). The promoter sequence and operator sequences were made synthetically. Synthetic production of nucleic acid sequences is well known in the art. CLONTECH 95/96 Catalog, pages 215-216, CLONTECH, 1020 East Meadow Circle, Palo Alto, Calif. 94303. The pHE4a vector was deposited with the ATCC on Feb. 25, 1998, and given accession No. 209645. A nucleotide sequence encoding the polypeptide of the present invention (CP) (SEQ ID NO:1), is operatively linked to the promoter and operator of pHE4a by restricting the vector with NdeI and either XbaI, BamHI, XhoI, or Asp718, and isolating the larger fragment (the multiple cloning site region is about 310 nucleotides) on a gel. The nucleotide sequence encoding the polypeptide of the present invention (CP) (SEQ ID NO:1) having the appropriate restriction sites is generated, for example, according to the PCR protocol described in Example 1, using PCR primers having restriction sites for NdeI (as the 5' primer) and either XbaI, BamHI, XhoI, or Asp718 (as the 3' primer). The PCR insert is gel purified and restricted with compatible enzymes. The insert and vector are ligated according to standard protocols. As noted above, the pHE4a vector contains a lacIq gene. LacIq is an allele of the lacI gene which confers tight regulation of the lac operator. Amann, E. et al., Gene 69:301-315 (1988); Stark, M., Gene 51:255-267 (1987). The lacIq gene encodes a repressor protein which binds to lac operator sequences and blocks transcription of down-stream (i.e., 3') sequences. However, the lacIq gene product dissociates from the lac operator in the presence of either lactose or certain lactose analogs, e.g., isopropyl B-D-thiogalactopyranoside (IPTG). The polypeptide of the present invention (CP) thus is not produced in appreciable quantities in uninduced host cells containing the pHE4a vector. Induction of these host cells by the addition of an agent such as IPTG, however, results in the expression of the CP coding sequence. The promoter/operator sequences of the pHE4a vector (SEQ ID NO:8) comprise a T5 phage promoter and two lac operator sequences. One operator is located 5' to the transcriptional start site and the other is located 3' to the same site. These operators, when present in combination with the lacIq gene product, confer tight repression of down-stream sequences in the absence of a lac operon inducer, e.g., IPTG. Expression of operatively linked sequences located down-stream from the lac operators may be induced by the addition of a lac operon inducer, such as IPTG. Binding of a lac inducer to the lacIq proteins results in their release from the lac operator sequences and the initiation of transcription of operatively linked sequences. Lac operon regulation of gene expression is reviewed in Devlin, T., TEXTBOOK OF BIOCHEMISTRY WITH CLINICAL CORRELATIONS, 4th Edition (1997), pages 802-807. The pHE4 series of vectors contain all of the components of the pHE4a vector except for the CP coding sequence. Features of the pHE4a vectors include optimized synthetic T5 phage promoter, lac operator, and Shine-Delagarno sequences. Further, these sequences are also optimally spaced so that expression of an inserted gene may be tightly regulated and high level of expression occurs upon induction. Among known bacterial promoters suitable for use in the production of proteins of the present invention include the E. coli lacI and lacZ promoters, the T3 and T7 promoters, the gpt promoter, the lambda PR and PL promoters and the trp promoter. Suitable eukaryotic promoters include the CMV immediate early promoter, the HSV thymidine kinase promoter, the early and late SV40 promoters, the promoters of retroviral LTRs, such as those of the Rous Sarcoma Virus (RSV), and metallothionein promoters, such as the mouse metallothionein-I promoter. The pHE4a vector also contains a Shine-Delgarno sequence 5' to the AUG initiation codon. Shine-Delgarno sequences are short sequences generally located about 10 nucleotides up-stream (i.e., 5') from the AUG initiation codon. These sequences essentially direct prokaryotic ribosomes to the AUG initiation codon. Thus, the present invention is also directed to expression vector useful for the production of the proteins of the present invention. This aspect of the invention is exemplified by the pHE4a vector (SEQ ID NO:7). The present invention further includes recombinant constructs comprising one or more of the sequences as broadly described above. The constructs comprise a vector, such as a plasmid or viral vector, into which a sequence of the invention has been inserted, in a forward or reverse orientation. In a preferred aspect of this embodiment, the construct further comprises regulatory sequences, including, for example, a promoter, operably linked to the sequence. Large numbers of suitable vectors and promoters are known to those of skill in the art, and are commercially available. The following vectors are provided by way of example; Bacterial: pQE70, pQE60, pQE-9 (Qiagen), pBS, pD10, phagescript, psiX174, pbluescript SK, pbsks, pNH8A, pNH16a, pNH18A, pNH46A (Stratagene); ptrc99a, pKK223-3, pKK233-3, pDR540, pRIT5 (Pharmacia); Eukaryotic: pWLNEO, pSV2CAT, pOG44, pXT1, pSG (Stratagene) pSVK3, pBPV, pMSG, pSVL (Pharmacia) . However, any other plasmid or vector may be used as long as they are replicable and viable in the host. Promoter regions can be selected from any desired gene using CAT (chloramphenicol transferase) vectors or other vectors with selectable markers. Two appropriate vectors are pKK232-8 and pCM7. Particular named bacterial promoters include lacI, lacZ, T3, T7, gpt, lambda P.sub.R, P.sub.L and trp. Eukaryotic promoters include CMV immediate early, HSV thymidine kinase, early and late SV40, LTRs from retrovirus, and mouse metallothionein-I. Selection of the appropriate vector and promoter is well within the level of ordinary skill in the art. In a further embodiment, the present invention relates to host cells containing the above-described constructs. The host cell can be a higher eukaryotic cell, such as a mammalian cell, or a lower eukaryotic cell, such as a yeast cell, or the host cell can be a prokaryotic cell, such as a bacterial cell. Introduction of the construct into the host cell can be effected by calcium phosphate transfection, DEAE-Dextran mediated transfection, or electroporation (Davis, L., Dibner, M., Battey, I., Basic Methods in Molecular Biology, (1986)). The constructs in host cells can be used in a conventional manner to produce the gene product encoded by the recombinant sequence. Alternatively, the polypeptides of the invention can be synthetically produced by conventional peptide synthesizers. Mature proteins can be expressed in mammalian cells, yeast, bacteria, or other cells under the control of appropriate promoters. Cell-free translation systems can also be employed to produce such proteins using RNAs derived from the DNA constructs of the present invention. Appropriate cloning and expression vectors for use with prokaryotic and eukaryotic hosts are described by Sambrook, et al., Molecular Cloning: A Laboratory Manual, Second Edition, Cold Spring Harbor, N.Y., (1989), the disclosure of which is hereby incorporated by reference. Transcription of the DNA encoding the polypeptides of the present invention by higher eukaryotes is increased by inserting an enhancer sequence into the vector. Enhancers are cis-acting elements of DNA, usually about from 10 to 300 bp that act on a promoter to increase its transcription. Examples include the SV40 enhancer on the late side of the replication origin bp 100 to 270, a cytomegalovirus early promoter enhancer, the polyoma enhancer on the late side of the replication origin, and adenovirus enhancers. Generally, recombinant expression vectors will include origins of replication and selectable markers permitting transformation of the host cell, e.g., the ampicillin resistance gene of E. coli and S. cerevisiae TRP1 gene, and a promoter derived from a highly-expressed gene to direct transcription of a downstream structural sequence. Such promoters can be derived from operons encoding glycolytic enzymes such as 3-phosphoglycerate kinase (PGK), .alpha.-factor, acid phosphatase, or heat shock proteins, among others. The heterologous structural sequence is assembled in appropriate phase with translation initiation and termination sequences, and preferably, a leader sequence capable of directing secretion of translated protein into the periplasmic space or extracellular medium. Optionally, the heterologous sequence can encode a fusion protein including an N-terminal identification peptide imparting desired characteristics, e.g., stabilization or simplified purification of expressed recombinant product. Useful expression vectors for bacterial use are constructed by inserting a structural DNA sequence encoding a desired protein together with suitable translation initiation and termination signals in operable reading phase with a functional promoter. The vector will comprise one or more phenotypic selectable markers and an origin of replication to ensure maintenance of the vector and to, if desirable, provide amplification within the host. Suitable prokaryotic hosts for transformation include E. coli, Bacillus subtilis, Salmonella typhimurium and various species within the genera Pseudomonas, Streptomyces, and Staphylococcus, although others may also be employed as a matter of choice. As a representative but nonlimiting example, useful expression vectors for bacterial use can comprise a selectable marker and bacterial origin of replication derived from commercially available plasmids comprising genetic elements of the well known cloning vector pBR322 (ATCC 37017). Such commercial vectors include, for example, pKK223-3 (Pharmacia Fine Chemicals, Uppsala, Sweden) and GEM1 (Promega Biotec, Madison, Wis., USA). These pBR322 "backbone" sections are combined with an appropriate promoter and the structural sequence to be expressed. Following transformation of a suitable host strain and growth of the host strain to an appropriate cell density, the selected promoter is induced by appropriate means (e.g., temperature shift or chemical induction) and cells are cultured for an additional period. Cells are typically harvested by centrifugation, disrupted by physical or chemical means, and the resulting crude extract retained for further purification. Microbial cells employed in expression of proteins can be disrupted by any convenient method, including freeze-thaw cycling, sonication, mechanical disruption, or use of cell lysing agents, such methods are well known to those skilled in the art. Various mammalian cell culture systems can also be employed to express recombinant protein. Examples of mammalian expression systems include the COS-7 lines of monkey kidney fibroblasts, described by Gluzman, Cell, 23:175 (1981), and other cell lines capable of expressing a compatible vector, for example, the C127, 3T3, CHO, HeLa and BHK cell lines. Mammalian expression vectors will comprise an origin of replication, a suitable promoter and enhancer, and also any necessary ribosome binding sites, polyadenylation site, splice donor and acceptor sites, transcriptional termination sequences, and 5' flanking nontranscribed sequences. DNA sequences derived from the SV40 splice, and polyadenylation sites may be used to provide the required nontranscribed genetic elements. The polypeptide can be recovered and purified from recombinant cell cultures by methods including ammonium sulfate or ethanol precipitation, acid extraction, anion or cation exchange chromatography, phosphocellulose chromatography, hydrophobic interaction chromatography, affinity chromatography, hydroxylapatite chromatography and lectin chromatography. Protein refolding steps can be used, as necessary, in completing configuration of the mature protein. Finally, high performance liquid chromatography (HPLC) can be employed for final purification steps. The polypeptides of the present invention may be a naturally purified product, or a product of chemical synthetic procedures, or produced by recombinant techniques from a prokaryotic or eukaryotic host (for example, by bacterial, yeast, higher plant, insect and mammalian cells in culture). Depending upon the host employed in a recombinant production procedure, the polypeptides of the present invention may be glycosylated or may be non-glycosylated. Polypeptides of the invention may also include an initial methionine amino acid residue. The polypeptide of the present invention (CP), may be employed for the promotion of wound healing. Since CP is a chemokine, it is a chemo-attractant for leukocytes (such as basophils, PMNs, PBLs etc.); therefore, it causes infiltration of target immune cells to a wound area. The polypeptide of the present invention (CP) may also be employed as an anti-tumor treatment and for treating localized complications of a malignancy, such as pleural effusions or ascites. The presence of MCPs in vivo is accompanied by a local increase in the presence of eosinophils which have the distinctive function of killing the larvae of parasites that invade tissues, as in schistosomiasis, trichinosis and ascariasis. Therefore, the polypeptide of the present invention (CP) may be employed for combatting parasitic infections. The polypeptide of the present invention may be employed for mobilizing hematopoietic progenitor cells into the peripheral blood circulation of a non-human and human host, preferably a human host, for subsequent recovery and use thereof in transplantation. The polypeptide of the present invention is administered in an amount effective to mobilize into and increase the amount of hematopoietic progenitor cells in the peripheral blood, in particular, increase the amount of human hematopoietic stem cells in the peripheral blood. Such cells are often referred to as CD34+ cells. For example, the polypeptide is administered in amounts as hereinafter described. The polypeptide of the present invention may be administered alone or in conjunction with other agents, for example, GM-CSF and G-CSF which are known to be effective for increasing such cells in peripheral blood. Mobilization of hematopoietic progenitor cells into the peripheral circulation is important for autologous and heterologous bone marrow transfers which are used, for example for treatment of cancer and hematological disorders. The polypeptide of the present invention may also be employed to inhibit destruction of hematopoietic progenitor cells in a non-human and human host, preferably a human host, resulting from treatment with chemotherapeutic agents. The polypeptide of the present invention may be administered prior to, during or subsequent to chemotherapy and allows a higher dose of chemotherapy to be employed in the treatment of cancer. The polypeptide of the present invention is administered in an amount effective to inhibit destruction of hematopoietic progenitor cells; for example, the polypeptide is administered in amounts as hereinafter described. The polypeptide may be administered alone or in conjunction with other agents. The polypeptide of the present invention may also be employed to protect hematopoietic progenitor cells to thereby prevent or inhibit diseases which may result from the destruction thereof; for example, leukopenia, myelodysplastic syndrome, and neutropenia. The polypeptide of the present invention may also be employed in amounts effective to inhibit the degeneration of neuronal cells in non-human and human hosts, preferably a human host, which results from neuronal degenerative diseases such as Alzheimer's disease, Parkinson's disease and AIDS-related complex. For example, the polypeptide may be employed in amounts as hereinafter described. TABLE 1 __________________________________________________________________________ Effect of CP administration to mice on the distribution of the primitive hematopoietic progenitors in peripheral blood, spleen, and bone marrow after two days Numbers of Progenitors per 10.sup.4 PB cells 10.sup.4 Spleen cells 10.sup.4 BM cells Treatment HPP LPP IM HPP LPP IM HPP LPP __________________________________________________________________________ Saline 0.5 .+-. 0.7 38 .+-. 9.5 6.5 .+-. 1.9 0.7 .+-. 1.5 5.5 .+-. 2.5 1.5 .+-. 2.3 53 .+-. 11 484 .+-. 59 CP 3.5 .+-. 0.5 95 .+-. 16.9 25 .+-. 13.5 2.75 .+-. 0.9 4.2 .+-. 3.5 3.5 .+-. 2.4 27 .+-. 3.5 610 .+-. 28 (1 mg/kg/day) __________________________________________________________________________ PB = Peripheral blood, mononuclear cells Spl. = Low density fraction of spleen cells BM = Bone marrow fraction that is 6fold enriched for the primitive cells HPP = High proliferative potential colony forming cells LPP = Low proliferative potential colony forming cells IM = Immature cell, a rare cell type found in the bone marrow, gives rise to a highly refractile, small (<50 cells/colony) colony in the presence o multiple cytokines; the cells within the colony are stacked in a horizontal plane and they exhibit blast cell like nuclear staining characteristics. Three mice were injected IP daily with either the polypeptide of the present invention (CP) or saline. Forty eight hours after the first injection, blood was collected from each animal by cardiac puncture and mice were then sacrificed to obtain bone marrow and spleen. Indicated numbers of cells from each of the tissues were then plated in duplicates in agarcontaining medium in the presence of rmIL3 (5 ng/ml), rmSCF (50 ng/ml), # rhMCSF (5 ng/ml), and rmIL1a (10 ng/ml) and incubated for 14 days. Data are pooled from three animals in each group and expressed as mean .+-. S.D. TABLE 2 __________________________________________________________________________ Effect of CP administration to mice on the distribution of the primitive hematopoietic progenitors in peripheral blood, spleen, and bone marrow after four days Numbers of Progenitors per 10.sup.4 PB cells 10.sup.4 Spleen cells 10.sup.4 BM cells Treatment HPP LPP IM HPP LPP IM HPP LPP __________________________________________________________________________ Saline 0 29 .+-. 6.5 1 .+-. 1.5 1 .+-. 0.6 10 .+-. 4.6 0.8 .+-. 0.7 60 .+-. 8 505 .+-. 45 CP 3.8 .+-. 1.5 84.5 .+-. 14.5 28.6 .+-. 8.6 2.6 .+-. 0.5 10.3 .+-. 2.1 7 .+-. 1.5 26.5 .+-. 8 330 .+-. 46 (1 mg/kg/day) __________________________________________________________________________ PB = Peripheral blood, mononuclear cells Spl. = Low density fraction of spleen cells BM = Bone marrow fraction that is 6fold enriched for the primitive cells HPP = High proliferative potential colony forming cells LPP = Low proliferative potential colony forming cells IM = Immature cell, a rare cell type found in the bone marrow, gives rise to a highly refractile, small (<50 cells/colony) colony in the presence o multiple cytokines; the cells within the colony are stacked in a horizontal plane and they exhibit blast cell like nuclear staining characteristics. Three mice were injected IP daily with either the polypeptide of the present invention (CP) or saline. Forty eight hours after the first injection, blood was collected from each animal by cardiac puncture and mice were then sacrificed to obtain bone marrow and spleen. Indicated numbers of cells from each of the tissues were then plated in duplicates in agarcontaining medium in the presence of rmIL3 (5 ng/ml), rmSCF (50 ng/ml), # rhMCSF (5 ng/ml), and rmIL1a (10 ng/ml) and incubated for 14 days. Data are pooled from three animals in each group and expressed as mean .+-. S.D. TABLE 3 ______________________________________ Analysis of the peripheral blood leukocyte composition by FACSan in mice administered with CP after two days Percent Positive in the Gated the Cell Populations Mac. 1 + CD45R + GR.1 + Mono- CD8 + CD4 + Treatment B-Cells PMN cytes T-cells T-cells ______________________________________ Saline 40.5 .+-. 9.2 62.5 .+-. 10.6 19.5 .+-. 2.1 29 .+-. 5.6 39 .+-. 12 CP 37 .+-. 5.6 56 .+-. 11.3 18 .+-. 4.2 27 .+-. 4.3 33 .+-. 7 (mg/Kg/day) ______________________________________ Three C57 Black 6 mice (.about.20 g weight) were injected (IP) daily with either saline or the polypeptide of the present invention (CP). Forty eight hours after the first injection, blood was collected by cardiac puncture and mice were sacrificed to obtain spleen and bone marrow cells. For immunostaining, 0.1 ml of blood from each of the animal was first treated with Gen Trak lysing solution to lyse the red blood cells. # Nucleated cells were then sedimented, washed with PBS, and incubated with PEconjugated monoclonal antibodies against CD45R, Gr. 1, Mac. 1, CD4, & CD8 and processed for flowcytometry. At least 10,000 cells were analyzed. Data are expressed as mean percent positive cells in the appropriate channels .+-. SD. The polynucleotides and polypeptides of the present invention may be employed as research reagents and materials for discovery of treatments and diagnostics to human disease. This invention provides a method for identification of the receptor for the polypeptide of the present invention (CP). The gene encoding the receptor can be identified by numerous methods known to those of skill in the art, for example, ligand panning and FACS sorting (Coligan, et al., Current Protocols in Immun., 1(2), Chapter 5, (1991)). Preferably, expression cloning is employed wherein polyadenylated RNA is prepared from a cell responsive to the polypeptide of the present invention (CP), and a cDNA library created from this RNA is divided into pools and used to transfect COS cells or other cells that are not responsive to CP. Transfected cells which are grown on glass slides are exposed to labeled polypeptide of the present invention (CP). The polypeptide of the present invention (CP) can be labeled by a variety of means including iodination or inclusion of a recognition site for a site-specific protein kinase. Following fixation and incubation, the slides are subjected to auto-radiographic analysis. Positive pools are identified and sub-pools are prepared and re-transfected using an iterative sub-pooling and re-screening process, eventually yielding a single clone that encodes the putative receptor. As an alternative approach for receptor identification, labeled ligand can be photoaffinity linked with cell membrane or extract preparations that express the receptor molecule. Cross-linked material is resolved by PAGE and exposed to X-ray film. The labeled complex containing the ligand-receptor can be excised, resolved into peptide fragments, and subjected to protein microsequencing. The amino acid sequence obtained from microsequencing would be used to design a set of degenerate oligonucleotide probes to screen a cDNA library to identify the gene encoding the putative receptor. This invention also provides a method of screening compounds to identify agonists and antagonists to the polypeptide of the present invention. As an example, a mammalian cell or membrane preparation expressing a CP receptor would be contacted with a compound of interest. The ability of the compound to generate a response of a known second messenger system following interaction with the CP receptor is then measured. Such second messenger systems include but are not limited to, cAMP guanylate cyclase, ion channels or phosphoinositide hydrolysis. The ability of a compound to bind the CP receptor and elicit a second messenger response identifies that compound as an agonist. A compound which binds but does not elicit a second messenger response identifies that compound as an antagonist. A competitive binding assay, in which the compounds are labeled, for example by radioactivity may also be employed to identify antagonists. Such methods are known in the art. Antagonists include negative dominant mutants of the polypeptide of the present invention (CP). The polypeptide of the present invention (CP) is a tetrameric polypeptide wherein one mutated unit will cause the entire polypeptide to be non-functional. A negative dominant mutant of the polypeptide of the present invention (CP) binds to the CP receptor but fails to activate cells (leukocytes) to which it binds. An assay to detect negative dominant mutants of the polypeptide of the present invention (CP) is an in vitro chemotaxis assay wherein a multiwell chemotaxis chamber equipped with polyvinylpyrrolidone-free polycarbonate membranes is used to measure the chemoattractant ability of the polypeptide of the present invention (CP) for leukocytes in the presence and absence of potential antagonist or agonist molecules. Potential antagonists also include an antibody, or in some cases, an oligopeptide, which binds to the polypeptide and prevents it from binding its receptor. Another potential antagonist is an antisense construct prepared using antisense technology. Antisense technology can be used to control gene expression through triple-helix formation or antisense DNA or RNA, both of which methods are based on binding of a polynucleotide to DNA or RNA. For example, the 5' coding portion of the polynucleotide sequence, which encodes for the mature polypeptides of the present invention, is used to design an antisense RNA oligonucleotide of from about 10 to 40 base pairs in length. A DNA oligonucleotide is designed to be complementary to a region of the gene involved in transcription (triple helix--see Lee et al., Nucl. Acids Res., 6:3073 (1979); Cooney et al, Science, 241:456 (1988); and Dervan et al., Science, 251: 1360 (1991)), thereby preventing transcription and the production of the polypeptide of the present invention (CP). The antisense RNA oligonucleotide hybridizes to the mRNA in vivo and blocks translation of the mRNA molecule into the polypeptide of the present invention (CP)(Antisense--Okano, J. Neurochem., 56:560 (1991); Oligodeoxynucleotides as Antisense Inhibitors of Gene Expression, CRC Press, Boca Raton, Fla. (1988)). The oligonucleotides described above can also be delivered to cells such that the antisense RNA or DNA may be expressed in vivo to inhibit production of the polypeptide of the present invention (CP). Potential antagonists include a small molecule which binds to and occupies the active site of the polypeptide thereby making the catalytic site inaccessible to substrate such that normal biological activity is prevented. Examples of small molecules include but are not limited to small peptides or peptide-like molecules. The antagonists may be employed to treat inflammation by preventing the attraction of monocytes to a wound or a site of trauma, and to regulate normal pulmonary macrophage populations, since acute and chronic inflammatory pulmonary diseases are associated with sequestration of mononuclear phagocytes in the lung. The antagonists may be employed in a composition with a pharmaceutically acceptable carrier, e.g., as hereinabove described. The polypeptides, and agonists and antagonists, of the present invention may be employed in combination with a suitable pharmaceutical carrier. Such compositions comprise a therapeutically effective amount of the polypeptide or agonist or antagonist, and a pharmaceutically acceptable carrier or excipient. Such a carrier includes but is not limited to saline, buffered saline, dextrose, water, glycerol, ethanol, and combinations thereof. The formulation should suit the mode of administration. The invention also provides a pharmaceutical pack or kit comprising one or more containers filled with one or more of the ingredients of the pharmaceutical compositions of the invention. Associated with such container(s) can be a notice in the form prescribed by a governmental agency regulating the manufacture, use or sale of pharmaceuticals or biological products, which notice reflects approval by the agency of manufacture, use or sale for human administration. In addition, the polypeptides, or agonists and antagonists, of the present invention may be employed in conjunction with other therapeutic compounds. The pharmaceutical compositions may be administered in a convenient manner such as by the oral, topical, parenterally, intravenous, intraperitoneal, intramuscular, subcutaneous, intranasal or intradermal routes. The pharmaceutical compositions are administered in an amount which is effective for treating and/or prophylaxis of the specific indication. In general, they are administered in an amount of at least about 10 .mu.g/kg body weight and in most cases they will be administered in an amount not in excess of about 8 mg/Kg body weight per day. In most cases, the dosage is from about 10 .mu.g/kg to about 1 mg/kg body weight daily, taking into account the routes of administration, symptoms, etc. The polypeptides and agonists and antagonists which are polypeptides may also be employed in accordance with the present invention by expression of such polypeptides in vivo, which is often referred to as "gene therapy." Thus, for example, cells from a patient may be engineered with a polynucleotide (DNA or RNA) encoding a polypeptide ex vivo, with the engineered cells then being provided to a patient to be treated with the polypeptide. Such methods are well-known in the art and are apparent from the teachings herein. For example, cells may be engineered by the use of a retroviral plasmid vector containing RNA encoding a polypeptide of the present invention. Similarly, cells may be engineered in vivo for expression of a polypeptide in vivo by, for example, procedures known in the art. For example, a packaging cell is transduced with a retroviral plasmid vector containing RNA encoding a polypeptide of the present invention such that the packaging cell now produces infectious viral particles containing the gene of interest. These producer cells may be administered to a patient for engineering cells in vivo and expression of the polypeptide in vivo. These and other methods for administering a polypeptide of the present invention by such method should be apparent to those skilled in the art from the teachings of the present invention. Retroviruses from which the retroviral plasmid vectors hereinabove mentioned may be derived include, but are not limited to, Moloney Murine Leukemia Virus, spleen necrosis virus, retroviruses such as Rous Sarcoma Virus, Harvey Sarcoma Virus, avian leukosis virus, gibbon ape leukemia virus, human immunodeficiency virus, adenovirus, Myeloproliferative Sarcoma Virus, and mammary tumor virus. In one embodiment, the retroviral plasmid vector is derived from Moloney Murine Leukemia Virus. The vector includes one or more promoters. Suitable promoters which may be employed include, but are not limited to, the retroviral LTR; the SV40 promoter; and the human cytomegalovirus (CMV) promoter described in Miller, et al., Biotechniques, Vol. 7, No. 9, 980-990 (1989), or any other promoter (e.g., cellular promoters such as eukaryotic cellular promoters including, but not limited to, the histone, pol III, and .beta.-actin promoters). Other viral promoters which may be employed include, but are not limited to, adenovirus promoters, thymidine kinase (TK) promoters, and B19 parvovirus promoters. The selection of a suitable promoter will be apparent to those skilled in the art from the teachings contained herein. The nucleic acid sequence encoding the polypeptide of the present invention is under the control of a suitable promoter. Suitable promoters which may be employed include, but are not limited to, adenoviral promoters, such as the adenoviral major late promoter; or hetorologous promoters, such as the cytomegalovirus (CMV) promoter; the respiratory syncytial virus (RSV) promoter; inducible promoters, such as the MMT promoter, the metallothionein promoter; heat shock promoters; the albumin promoter; the ApoAI promoter; human globin promoters; viral thymidine kinase promoters, such as the Herpes Simplex thymidine kinase promoter; retroviral LTRs (including the modified retroviral LTRs hereinabove described); the .beta.-actin promoter; and human growth hormone promoters. The promoter also may be the native promoter which controls the gene encoding the polypeptide. The retroviral plasmid vector is employed to transduce packaging cell lines to form producer cell lines. Examples of packaging cells which may be transfected include, but are not limited to, the PE501, PA317, .psi.-2, .psi.-AM, PA12, T19-14X, VT-19-17-H2, .psi.CRE, .psi.CRIP, GP+E-86, GP+envAm12, and DAN cell lines as described in Miller, Human Gene Therapy, Vol. 1, pgs. 5-14 (1990), which is incorporated herein by reference in its entirety. The vector may transduce the packaging cells through any means known in the art. Such means include, but are not limited to, electroporation, the use of liposomes, and CaPO.sub.4 precipitation. In one alternative, the retroviral plasmid vector may be encapsulated into a liposome, or coupled to a lipid, and then administered to a host. The producer cell line generates infectious retroviral vector particles which include the nucleic acid sequence(s) encoding the polypeptides. Such retroviral vector particles then may be employed, to transduce eukaryotic cells, either in vitro or in vivo. The transduced eukaryotic cells will express the nucleic acid sequence(s) encoding the polypeptide. Eukaryotic cells which may be transduced include, but are not limited to, embryonic stem cells, embryonic carcinoma cells, as well as hematopoietic stem cells, hepatocytes, fibroblasts, myoblasts, keratinocytes, endothelial cells, and bronchial epithelial cells. This invention is also related to the use of the gene of the present invention as a diagnostic. Detection of a mutated form of the gene will allow a diagnosis of a disease or a susceptibility to a disease which results from underexpression of the polypeptide of the present invention (CP). Individuals carrying mutations in the gene of the present invention may be detected at the DNA level by a variety of techniques. Nucleic acids for diagnosis may be obtained from a patient's cells, including but not limited to blood, urine, saliva, tissue biopsy and autopsy material. The genomic DNA may be used directly for detection or may be amplified enzymatically by using PCR (Saiki et al., Nature, 324:163-166 (1986)) prior to analysis. RNA or cDNA may also be used for the same purpose. As an example, PCR primers complementary to the nucleic acid encoding the polypeptide of the present invention (CP) can be used to identify and analyze mutations. For example, deletions and insertions can be detected by a change in size of the amplified product in comparison to the normal genotype. Point mutations can be identified by hybridizing amplified DNA to radiolabeled RNA or alternatively, radiolabeled antisense DNA sequences. Perfectly matched sequences can be distinguished from mismatched duplexes by RNase A digestion or by differences in melting temperatures. Sequence differences between the reference gene and genes having mutations may be revealed by the direct DNA sequencing method. In addition, cloned DNA segments may be employed as probes to detect specific DNA segments. The sensitivity of this method is greatly enhanced when combined with PCR. For example, a sequencing primer is used with double-stranded PCR product or a single-stranded template molecule generated by a modified PCR. The sequence determination is performed by conventional procedures with radiolabeled nucleotide or by automatic sequencing procedures with fluorescent-tags. Genetic testing based on DNA sequence differences may be achieved by detection of alteration in electrophoretic mobility of DNA fragments in gels with or without denaturing agents. Small sequence deletions and insertions can be visualized by high resolution gel electrophoresis. DNA fragments of different sequences may be distinguished on denaturing formamide gradient gels in which the mobilities of different DNA fragments are retarded in the gel at different positions according to their specific melting or partial melting temperatures (see, e.g., Myers et al., Science, 230:1242 (1985)). Sequence changes at specific locations may also be revealed by nuclease protection assays, such as RNase and S1 protection or the chemical cleavage method (e.g., Cotton et al., PNAS, USA, 85:4397-4401 (1985)). Thus, the detection of a specific DNA sequence may be achieved by methods such as hybridization, RNase protection, chemical cleavage, direct DNA sequencing or the use of restriction enzymes, (e.g., Restriction Fragment Length Polymorphisms (RFLP)) and Southern blotting of genomic DNA. In addition to more conventional gel-electrophoresis and DNA sequencing, mutations can also be detected by in situ analysis. The present invention also relates to a diagnostic assay for detecting altered levels of the polypeptide of the present invention in various tissues since an over-expression of the proteins compared to normal control tissue samples can detect the presence of the polypeptide of the present invention (CP). Assays used to detect levels of the polypeptide of the present invention in a sample derived from a host are well-known to those of skill in the art and include radioimmunoassays, competitive-binding assays, Western Blot analysis and preferably an ELISA assay. An ELISA assay initially comprises preparing an antibody specific to the CP antigen, preferably a monoclonal antibody. In addition a reporter antibody is prepared against the monoclonal antibody. To the reporter antibody is attached a detectable reagent such as radioactivity, fluorescence or in this example a horseradish peroxidase enzyme. A sample is now removed from a host and incubated on a solid support, e.g. a polystyrene dish, that binds the proteins in the sample. Any free protein binding sites on the dish are then covered by incubating with a non-specific protein such as bovine serum albumin. Next, the monoclonal antibody is incubated in the dish during which time the monoclonal antibodies attach to any of the polypeptide of the present invention attached to the polystyrene dish. All unbound monoclonal antibody is washed out with buffer. The reporter antibody linked to horseradish peroxidase is now placed in the dish resulting in binding of the reporter antibody to any monoclonal antibody bound to the polypeptide of the present invention. Unattached reporter antibody is then washed out. Peroxidase substrates are then added to the dish and the amount of color developed in a given time period is a measurement of the amount of the polypeptide of the present invention present in a given volume of patient sample when compared against a standard curve. A competition assay may be employed wherein antibodies specific to the polypeptide of the present invention (CP) are attached to a solid support and labeled CP and a sample derived from the host are passed over the solid support and the amount of label detected attached to the solid support can be correlated to a quantity of the polypeptide of the present invention in the sample. The sequences of the present invention are also valuable for chromosome identification. The sequence is specifically targeted to and can hybridize with a particular location on an individual human chromosome. Moreover, there is a current need for identifying particular sites on the chromosome. Few chromosome marking reagents based on actual sequence data (repeat polymorphisms) are presently available for marking chromosomal location. The mapping of DNAs to chromosomes according to the present invention is an important first step in correlating those sequences with genes associated with disease. Briefly, sequences can be mapped to chromosomes by preparing PCR primers (preferably 15-25 bp) from the cDNA. Computer analysis of the 3' untranslated region of the gene is used to rapidly select primers that do not span more than one exon in the genomic DNA, thus complicating the amplification process. These primers are then used for PCR screening of somatic cell hybrids containing individual human chromosomes. Only those hybrids containing the human gene corresponding to the primer will yield an amplified fragment. PCR mapping of somatic cell hybrids is a rapid procedure for assigning a particular DNA to a particular chromosome. Using the present invention with the same oligonucleotide primers, sublocalization can be achieved with panels of fragments from specific chromosomes or pools of large genomic clones in an analogous manner. Other mapping strategies that can similarly be used to map to its chromosome include in situ hybridization, prescreening with labeled flow-sorted chromosomes and preselection by hybridization to construct chromosome specific-cDNA libraries. Fluorescence in situ hybridization (FISH) of a cDNA clone to a metaphase chromosomal spread can be used to provide a precise chromosomal location in one step. This technique can be used with cDNA having at least 50 or 60 bases. For a review of this technique, see Verma et al., Human Chromosomes: a Manual of Basic Techniques, Pergamon Press, New York (1988). Once a sequence has been mapped to a precise chromosomal location, the physical position of the sequence on the chromosome can be correlated with genetic map data. Such data are found, for example, in V. McKusick, Mendelian Inheritance in Man (available on line through Johns Hopkins University Welch Medical Library). The relationship between genes and diseases that have been mapped to the same chromosomal region are then identified through linkage analysis (coinheritance of physically adjacent genes). Next, it is necessary to determine the differences in the cDNA or genomic sequence between affected and unaffected individuals. If a mutation is observed in some or all of the affected individuals but not in any normal individuals, then the mutation is likely to be the causative agent of the disease. With current resolution of physical mapping and genetic mapping techniques, a cDNA precisely localized to a chromosomal region associated with the disease could be one of between 50 and 500 potential causative genes. (This assumes 1 megabase mapping resolution and one gene per 20 kb). The polypeptides, their fragments or other derivatives, or analogs thereof, or cells expressing them can be used as an immunogen to produce antibodies thereto. These antibodies can be, for example, polyclonal or monoclonal antibodies. The present invention also includes chimeric, single chain, and humanized antibodies, as well as Fab fragments, or the product of an Fab expression library. Various procedures known in the art may be used for the production of such antibodies and fragments. Antibodies generated against the polypeptides corresponding to a sequence of the present invention can be obtained by direct injection of the polypeptides into an animal or by administering the polypeptides to an animal, preferably a nonhuman. The antibody so obtained will then bind the polypeptides itself. In this manner, even a sequence encoding only a fragment of the polypeptides can be used to generate antibodies binding the whole native polypeptides. Such antibodies can then be used to isolate the polypeptide from tissue expressing that polypeptide. For preparation of monoclonal antibodies, any technique which provides antibodies produced by continuous cell line cultures can be used. Examples include the hybridoma technique (Kohler and Milstein, 1975, Nature, 256:495-497), the trioma technique, the human B-cell hybridoma technique (Kozbor et al., 1983, Immunology Today 4:72), and the EBV-hybridoma technique to produce human monoclonal antibodies (Cole, et al., 1985, in Monoclonal Antibodies and Cancer Therapy, Alan R. Liss, Inc., pp. 77-96). Techniques described for the production of single chain antibodies (U.S. Pat. No. 4,946,778) can be adapted to produce single chain antibodies to immunogenic polypeptide products of this invention. Also, transgenic mice may be used to express humanized antibodies to immunogenic polypeptide products of this invention. The present invention will be further described with reference to the following examples; however, it is to be understood that the present invention is not limited to such examples. All parts or amounts, unless otherwise specified, are by weight. In order to facilitate understanding of the following examples certain frequently occurring methods and/or terms will be described. "Plasmids" are designated by a lower case p preceded and/or followed by capital letters and/or numbers. The starting plasmids herein are either commercially available, publicly available on an unrestricted basis, or can be constructed from available plasmids in accord with published procedures. In addition, equivalent plasmids to those described are known in the art and will be apparent to the ordinarily skilled artisan. "Digestion" of DNA refers to catalytic cleavage of the DNA with a restriction enzyme that acts only at certain sequences in the DNA. The various restriction enzymes used herein are commercially available and their reaction conditions, cofactors and other requirements were used as would be known to the ordinarily skilled artisan. For analytical purposes, typically 1 .mu.g of plasmid or DNA fragment is used with about 2 units of enzyme in about 20 .mu.l of buffer solution. For the purpose of isolating DNA fragments for plasmid construction, typically 5 to 50 .mu.g of DNA are digested with 20 to 250 units of enzyme in a larger volume. Appropriate buffers and substrate amounts for particular restriction enzymes are specified by the manufacturer. Incubation times of about 1 hour at 37.degree. C. are ordinarily used, but may vary in accordance with the supplier's instructions. After digestion the reaction is electrophoresed directly on a polyacrylamide gel to isolate the desired fragment. Size separation of the cleaved fragments is performed using 8 percent polyacrylamide gel described by Goeddel, D. et al., Nucleic Acids Res., 8:4057 (1980). "Oligonucleotides" refers to either a single stranded polydeoxynucleotide or two complementary polydeoxynucleotide strands which may be chemically synthesized. Such synthetic oligonucleotides have no 5' phosphate and thus will not ligate to another oligonucleotide without adding a phosphate with an ATP in the presence of a kinase. A synthetic oligonucleotide will ligate to a fragment that has not been dephosphorylated. "Ligation" refers to the process of forming phosphodiester bonds between two double stranded nucleic acid fragments (Maniatis, T., et al., Id., p. 146). Unless otherwise provided, ligation may be accomplished using known buffers and conditions with 10 units to T4 DNA ligase ("ligase") per 0.5 .mu.g of approximately equimolar amounts of the DNA fragments to be ligated. Unless otherwise stated, transformation was performed as described in the method of Graham, F. and Van der Eb, A., Virology, 52:456-457 (1973). |
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