Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07K—PEPTIDES
  • C07K16/00—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies
  • C07K16/18—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans
  • C07K16/28—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
  • C07K16/2866—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against receptors for cytokines, lymphokines, interferons
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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  • A61P1/00—Drugs for disorders of the alimentary tract or the digestive system
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  • A61P1/00—Drugs for disorders of the alimentary tract or the digestive system
  • A61P1/04—Drugs for disorders of the alimentary tract or the digestive system for ulcers, gastritis or reflux esophagitis, e.g. antacids, inhibitors of acid secretion, mucosal protectants
• • A—HUMAN NECESSITIES
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  • A61P11/00—Drugs for disorders of the respiratory system
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  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P19/00—Drugs for skeletal disorders
  • A61P19/02—Drugs for skeletal disorders for joint disorders, e.g. arthritis, arthrosis
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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  • A61P29/00—Non-central analgesic, antipyretic or antiinflammatory agents, e.g. antirheumatic agents; Non-steroidal antiinflammatory drugs [NSAID]
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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  • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
  • A61P31/04—Antibacterial agents
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
  • A61P31/10—Antimycotics
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
  • A61P31/12—Antivirals
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
  • A61P31/12—Antivirals
  • A61P31/14—Antivirals for RNA viruses
  • A61P31/18—Antivirals for RNA viruses for HIV
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P33/00—Antiparasitic agents
  • A61P33/02—Antiprotozoals, e.g. for leishmaniasis, trichomoniasis, toxoplasmosis
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P35/00—Antineoplastic agents
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P37/00—Drugs for immunological or allergic disorders
• • A—HUMAN NECESSITIES
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  • A61P37/00—Drugs for immunological or allergic disorders
  • A61P37/02—Immunomodulators
  • A61P37/06—Immunosuppressants, e.g. drugs for graft rejection
• • A—HUMAN NECESSITIES
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  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K39/00—Medicinal preparations containing antigens or antibodies
  • A61K2039/505—Medicinal preparations containing antigens or antibodies comprising antibodies
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K38/00—Medicinal preparations containing peptides

Definitions

• the present invention relates generally to cytokine inhibitors. More particularly, the invention relates to inhibitors to IL8 receptor binding, including antibodies, that interact with the amino-terminal extracellular domain of the DL8 receptor and compete with IL8 and other related natural ligands, for receptor- binding.
• Cytokines are a group of hormone-like mediators produced by leukocytes. These agents serve as endogenous biological signals that act in conjunction with antigens to amplify both localized and systemic host defense mechanisms involving macrophages, lymphocytes, and other cell types. Representative cytokines include the various interleukins, interferons, GRO ⁇ , GRO/3 and GRO ⁇ , neutrophil activating peptide-2 (NAP-2) and ENA-78. Cytokines have been used to treat and prevent a wide variety of disorders based on the ability of these molecules to stimulate an immunological response.
• Interleukin-8 is a cytokine originally derived from human macrophages (Suzuki, K. et al. (1989) J. Exp. Med. 169:1895-1901; Schroder, J.M. et al. (1987) J. Immunol. 139:3474-3483; Schroder, J.M. et al. (1988) J. Immunol. 140:3534-3540; Schroder, J.M. (1989) J. Exp. Med. 170:847-861; Larson, C.G. et al. (1989) Science 243:1464-1466).
• PMN polymorphonuclear
• MONAP monocyte-derived neutrophil- activating peptide
• MDNCF monocyte-derived neutrophil chemotactic factor
• TCF T lymphocyte chemotactic factor
• LYNAP lymphocyte-derived neutrophil-activating peptide 1
• NAP-1 neutrophil-activating peptide 1
• the IL8 molecule is produced by a wide variety of tissues and cells, including mononuclear phagocytes, endothelial cells, fibroblasts, epithelial cells and alveolar macrophages, upon stimulation with such agents as lipopolysaccharide and phorbol myristate, phytohemagglutinin, Con A, or other mitogenic preparations and cytokines such as interleukin-1 (IL1) and tumor necrosis factor (TNF).
• IL1 interleukin-1
• TNF tumor necrosis factor
• the gene encodes a precursor protein having 99 amino acids which is proteolytically cleaved into secreted IL8 polypeptides of various lengths, such as those containing 69, 72 or 77 amino acid residues, with molecular masses of approximately 8000 Daltons.
• Human IL8 acts as a chemoattractant for neutrophils, and induces granulocytosis upon systemic injection and skin reaction upon local injection, in experimental animals.
• the molecule also activates the release of superoxide anions and elicits release of the primary granule constituents of neutrophils, including myeloperoxidase, -glucuronidase and elastase.
• IL8 mediates these activities by binding to its receptor and triggering signal transduction, a cascade of reactions ultimately resulting in a biological response.
• IL8R1 human IL8 receptors
• IL8R2 human IL8 receptors
• GRO ⁇ , GRO / S, GRO ⁇ , NAP-2 and ENA-78 all bind to one IL8 receptor on human neutrophils, as described in Baggiolini et al. , FEBS Lett. (1992) 307:97-101; Walz et al. , J. Exp. Med. (1991) 174:1355; Moser et al. , J. Biol. Chem. (1991) 266:10666; Geiser et al , J. Biol. Chem. (1993) 268: 15419-15424.
• Gayle et al. J. Biol. Chem. (1993) 268:7283-7289 and LaRosa et al. , J. Biol. Chem. (1992) 267:25402-25406 relate to an important determinant for the binding of natural IL8R2 agonists, GROo./MGSA and NAP-2, resides in the region of the receptor that includes the amino-terminal extracellular domain and a portion of the first transmembrane region.
• the present invention provides for substances that inhibit IL8 binding to its receptor via interaction with the amino-terminal extracellular domain of the IL8 receptor.
• the inhibitors are useful modulators of D 8 receptor-mediated biological activity.
• the invention is directed to an inhibitor to IL8 receptor-binding, as defined below, that comprises a molecule that is capable of interacting with the amino-terminal extracellular domain of an IL8 receptor and that is capable of competing with IL8 for the receptor.
• the inhibitor is an antibody raised against a polypeptide derived from the amino-terminal extracellular domain of IL8R1 or IL8R2 comprising an amino acid sequence substantially the same as any one of the amino acid sequences M-S-N-I-T-D-P-Q-M-W-D-F-D-D-L, M-E-S-D-S-F-E-D-F- W-K-G-E-D-L, F-E-D-F-W-K-G-E-D-L-S-N-Y-S-Y, S-S-T-L-P-P-F-L-L-D-A-A- P-C or F-L-L-D-A-A-P-C-E-P-E-S-L-E-I.
• the invention includes a mixture of antibodies raised against at least four polypeptides derived from the amino-terminal extracellular domain of IL8R2, wherein
• amino acid sequence of the first polypeptide comprises an amino acid sequence substantially the same as the amino acid sequence M-E-S-D-S-F-E- D-F-W-K-G-E-D-L;
• amino acid sequence of the second polypeptide comprises an amino acid sequence substantially the same as the amino acid sequence F-E-D-F-W-K-G- E-D-L-S-N-Y-S-Y;
• the amino acid sequence of the third polypeptide comprises an amino acid sequence substantially the same as the amino acid sequence S-S-T-L-P-P-F-L- L-D-A-A-P-C;
• the amino acid sequence of the fourth polypeptide comprises an amino acid sequence substantially the same as the amino acid sequence F-L-L-D-A-A-P- C-E-P-E-S-L-E-I.
• the invention is directed to a method of inhibiting the binding of IL8 to its receptor, comprising:
• the invention is directed to a method of modulating an IL8 receptor-mediated biological response comprising:
• the invention is directed to an inhibitor to IL8 receptor-binding comprising a molecule that is capable of interacting with the amino-terminal extracellular domain of an IL8 receptor and that is capable of competing with a molecule selected from the group consisting of IL8, GRO ⁇ ,
• GROjS GRO ⁇ , NAP-2 and ENA-78, for the receptor.
• Figure 1 shows the amino acid sequences of the amino-terminal extracellular domain of human IL8R1 and human IL8R2 and depicts the peptides used to raise antisera.
• Figure 2 shows the results of a FACS analysis of neutrophils using antisera to amino-terminal I RI and IL8R2 peptides, as described in the examples.
• Neutrophils were incubated with sheep pre-immune IgG ( Figures 2 A and 2C), anti-IL8Rl peptide IgG ( Figure 2B) or anti-IL8R2 peptide IgG ( Figure 2D), each diluted 1:150 in PBS +1 % BSA, then treated with fluoresein-labelled rabbit anti- sheep antibodies (1:100 in PBS + 1 % BSA) and subjected to FACS analysis, as described below.
• Figure 3 depicts the results of receptor binding assays for IL8R1, as described in the examples.
• Sf9 cells were infected with recombinant baculovirus for expression of D 8R1 and binding of 125 I-IL8 was assayed as described after a 1 hour preincubation with IL8 or antibodies: 1672 p, IgG fraction from preimmune serum control for IL8R1 peptide #1 serum; 1672 i, IgG fraction from antiserum to peptide #1; Aff pur 1672 i, affinity purified antibodies to IL8R1 peptide #1; 1673 p, IgG fraction from preimmune serum control for IL8R2 peptides #10-13 serum, 1673 i, IgG fraction from antiserum to IL8R2 peptides #10-13. The final concentrations of each effector are indicated.
• Figure 4 shows anti-IL8Rl peptide #1 inhibition of IL8 binding to IL8R1 on Sf9 cells.
• Sf9 cells were infected with baculovirus for IL8R1, preincubated with antibodies, and assayed for 125 I-IL8 binding as described above. Where indicated (Affin purif + pepl), the affinity purified antibodies to IL8R1 peptide #1 were pre-absorbed with 50 mg/mL of peptid; #1 prior to use. Data are corrected for non-specific binding as measured in the presence of 1 mg/ml of unlabeled IL8.
• Figure 5 depicts the results of receptor binding assays for IL8R2, as described above and in the examples.
• Figure 6 shows anti-IL8R2 peptide #10 inhibition of IL8 binding to IL8R2 on Sf9 cells.
• Sf9 cells were infected with baculovirus for IL8R2, preincubated with antibodies, and assayed for 125 I-IL8 binding as described above.
• Antibody additions are as follows: Preimmune IgG, IgG fraction from preimmune serum control; Anti-R2 pep IgG, IgG fraction from antiserum to E 8R2 peptides#10-13; Affin purif anti-pep 10 or Affin purif - peplO, affinity purified antibodies to peptide #10; Affin purif + peplO, affinity purified antibody to peptide #10 pre- absorbed with 50 mg/ml of peptide #10. Data are corrected for non-specific binding as measured in the presence of 1 mg/ml unlabeled IL8.
• an "inhibitor to IL8 receptor-binding" is a substance (other than native IL8 or other naturally occurring, endogenous neutrophil IL8 receptor ligands, such as GROG., JS, , NAP-2, and ENA-78) which interacts either directly or indirectly with an IL8 receptor and competes with IL8 or other natural ligands, such as GRO ⁇ , ⁇ , 7, NAP-2, and ENA-78, for binding to the receptor.
• IL8 receptor- binding interaction includes both covalent and non-covalent associations between the inhibitor and the IL8 receptor.
• the inhibitor can bind the IL8 receptor at an IL8 binding site in the amino-terminal extracellular domain and block IL8 binding.
• the inhibitor can interact with the IL8 receptor at a site other than the binding site and cause a conformational change in the receptor molecule that affects IL8 binding.
• the inhibitor can interact with IL8 directly, either at the receptor-binding site or at another part of the molecule, and inhibit binding of IL8 to the receptor.
• Other possible interactions between the inhibitor, receptor and/or IL8 will readily occur to one of skill in the art and are also encompassed by this definition.
• the ability of a molecule to bind an IL8 receptor and to compete with IL8 for recep r binding can be determined using conventional receptor-binding assays.
• the ability of the inhibitor to bind the receptor can be assessed directly by labelling the inhibitor and demonstrating binding to receptor-bearing cells, such as neutrophils. Inhibitor binding can also be demonstrated by methods such as chemical cross-linking, by anti-inhibitor antibody recognition of the presence of the inhibitor bound to receptor-bearing cells, as described in the examples, by NMR or X-ray crystallography of inhibitor/receptor complexes, and/or by any other methods appropriate for use with a given inhibitor, generally known by a skilled practitioner.
• the ability of the inhibitors of the present invention to compete with IL8 for receptor binding can be determined using standard competition assays, such as the radioimmunoassays described in Gayle et al. , J. Biol.
• an inhibitor of IL8 binding can be either an agonist, i.e. , a molecule capable of promoting at least one of the biological responses normally associated with E 8, or an antagonist, i.e. , a substance that opposes at least one of the effects of IL8, thereby reducing the ability of IL8 to mediate biological responses normally associated therewith.
• IL8 receptor refers to any of the several vertebrate IL8 receptors, or fragments thereof which include an IL8 binding domain.
• IL8R1 and IL8R2 are encompassed by this term.
• IL8 receptor-binding or "IL8 binding” refers to the binding to any one of the E 8 receptors of any of EL8, GRO ⁇ , GRO 3, GRCty, NAP-2 and ENA-78, fragments thereof and other naturally occurring ligands.
• modulating an IL8 receptor-mediated biological response is meant either increasing or decreasing the incidence of one or more cellular activities normally triggered by the binding of IL8 to its receptor. The nature of these activities may be biochemical or biophysical. For example, a substance would "modulate an IL8 receptor-mediated biological response” if it does not stimulate the same signal transduction activity as IL8 when the inhibitor binds to an IL8 receptor. The increase or decrease can be monitored using various assays, described further below, which also utilize IL8 receptor molecules as controls.
• an IL8 inhibitor will "modulate an IL8 receptor-mediated response" when it causes an increase or decrease in any one of these reactions.
• IL8 receptors are G-coupled proteins which, when proper signal transduction activity occurs, triggers an increase of intracellular Ca 2+ , IP 3 , and DAG levels. Standard assays can be used to measure the intracellular levels of these substances and hence determine whether the IL8 receptor-mediated response has been modulated. Assays for measuring levels of free cytosolic Ca 2+ are known and described in, e.g. , International Publication No. WO93/06229 (published 1 April 1993); Bazzoni, F.
• Intracellular IP 3 concentrations and DAG levels can also be measured by known methods.
• IL8 Other biological activities attributable to IL8 which can be measured in order to determine modulation include, for example, neutrophil chemotactic activity, measured using assays generally known in the art (see, e.g. , Schroder, J.M. et al. (1987) J. Immunol. 139:3474-3483; Fincham, N.J. et al. (1988) J. Immunol. 140:4294-4299; Larson, C.G. et al. (1989) Science 243:1464-1466; Grob, P.M. et al. (1990) J. Biol. Chem. 265:8311-8316; Strieter, R.M. et al. (1989) J. Biol.
• Chem. 264:10621-10626 enzyme release assays, such as PMN peroxidase-releasing activity assays, ⁇ -glucoronidase release assays, O 2 - release as determined by cytochrome C assays and elastase release assays (see, e.g. , Schroder, J.M. et al. (1987) J. Immunol. 139:3474-3483; Peveri, P. et al. (1988) J. Exp. Med. 167:1547-1559).
• enzyme release assays such as PMN peroxidase-releasing activity assays, ⁇ -glucoronidase release assays, O 2 - release as determined by cytochrome C assays and elastase release assays (see, e.g. , Schroder, J.M. et al. (1987) J. Immunol. 139:3474-3483; Peveri, P.
• Two peptides will be “substantially the same” or “substantially identical” when at least about 50%, usually at least about 60%, more typically at least about 75 % and preferably at least about 90-95 % , of the amino acids match over a defined length of the molecule.
• substantially the same also refers to sequences showing identity to the specified polypeptide sequence.
• native IL8 is meant a polypeptide having an amino acid sequence which is identical to a sequence recovered from a source which naturally produces IL8. Native IL8 may be of varying lengths, such as those containing 69, 72 and 77 amino acid residues, respectively.
• polypeptide and protein refer to a polymer of amino acid residues and are not limited to a minimum length of the product. Thus, peptides, oligopeptides, dimers, multimers, and the like, are included within the definition. Both full-length proteins and fragments thereof are encompassed by the definition.
• the terms also include postexpression modifications of the polypeptide, for example, glycosylation, acetylation, phosphorylation and the like.
• antibody encompasses polyclonal and monoclonal antibody preparations, as well as preparations including hybrid antibodies, altered anti ⁇ bodies, F(ab') 2 fragments, F(ab) fragments, F v fragments, single domain antibod ⁇ ies, chimeric antibodies, humanized antibodies, and functional fragments thereof, which retain specificity for amino-terminal extracellular domain IL8 binding sites.
• an antibody can include variable regions, or fragments of variable regions, which retain specificity for the amino-terminal extracellular domain of an IL8 receptor molecule. The remainder of the antibody can be derived from the species in which the antibody will be used.
• the antibody can be "humanized” in order to reduce immunogenicity yet retain activity.
• chimeric antibodies see, e.g. , Winter, G. and Milstein, C. (1991) Nature 349:293-299; Jones, P.T. et al. (1986) Nature 321:522-525; Riechmann, L. et al. (1988) 332:323-327; and Carter, P. et al. (1992) Proc. Natl. Acad. Sci. USA 89:4285-4289.
• Such chimeric antibodies may contain not only combining sites for the IL8 receptor, but also binding sites for other proteins.
• bifunctional reagents can be generated with targeted specificity to both external and internal antigens.
• An "antigen” or “immunogen” refers to a molecule which contains one or more epitopes that will stimulate a host's immune system to make a secretory, humoral and/or cellular antigen-specific response.
• an “effective inhibiting amount” of an IL8 inhibitor refers to an amount of inhibitor sufficient to block the binding, in whole or part, of IL8 to the IL8 receptor.
• the precise effective inhibiting amount will depend upon the number and type of IL8 receptors present on the surface of the particular cell in question. Such an amount can be readily determined by one of skill in the art using routine experimentation and IL8 binding assays, such as standard neutrophil binding assays, as described in the examples.
• the term “effective modulating amount” of an IL8 inhibitor refers to an amount of inhibitor sufficient to cause a change in an IL8 receptor-mediated biological activity, as described above. This amount will also depend on the number and type of IL8 receptors present on the surface of the particular cell in question and will vary depending on the biological activity targeted. Assays for determining changes in IL8 receptor-mediated activity are described above.
• IL8 inhibitors that are capable of suppressing the binding of various ligands, including IL8, GRO ⁇ , GRO/3, GRO7, NAP-2 and ENA-78, to IL8 receptors, thereby modulating the biological responses triggered by such binding. Accordingly, these inhibitors can block or modulate chemotaxis and neutrophil activation.
• the inhibitors are useful for the treatment and prevention of a wide variety of disorders where neutrophils contribute to the pathology of the disease, including inflammatory diseases such as rheumatoid arthritis and inflammatory bowel disease, as well as for the treatment and/or prevention of tissue injury during such diseases as septic shock and acute respiratory distress syndrome (ARDS).
• ARDS septic shock and acute respiratory distress syndrome
• the inhibitors of the present invention will also find use for stimulating neutrophil-mediated inflammatory response in the treatment of cancerous conditions, viral, bacterial, fungal and protozoal infections, as well as for the treatment of conditions where the immune system is compromised, such as AIDS and other acquired and inherited immune disorders.
• the inhibitors of the present invention act at the amino-terminal extracellular domain of the IL8 receptor and include, for example, anti-amino- terminal extracellular domain antibodies, peptides, non-peptide small molecule inhibitors or any molecule that modulates IL8 action through interaction with the amino-terminal extracellular domain of the IL8 receptor.
• Inhibitors for use in the present invention include antibodies raised against isolated peptide sequences derived from contiguous sequences spanning this region, as well as antibodies raised against analogs thereof (i.e., sequences with amino acid substitutions, additions or deletions), which retain the ability to bind the IL8 receptor and inhibit the binding of IL8 thereto, as defined above.
• antibodies and mixtures of antibodies are able to block the binding of IL8 to the receptor.
• the recognition site (epitope) for these antibodies appears to overlap with, or be proximal to, the IL8 recognition site.
• These antibodies can be polyclonal, monoclonal, chimeric, or functional fragments thereof, generated using standard techniques.
• useful antibody preparations can include mixtures of several different antibodies, as detailed further below. Peptides useful for raising antibody inhibitors will usually by at least about
• peptides have been synthesized based on the amino acid sequence of the amino-terminal extracellular binding domain of E 8R1 and IL8R2. These peptides are shown in Tables 1 and 2, in the examples. These and other peptides may be synthesized by protein synthesis techniques known to those of skill in the peptide art. In general, these methods employ either solid or solution phase synthesis methods, well known in the art. See, e.g. , J. M. Stewart and J. D. Young, Solid Phase Peptide Synthesis, 2nd Ed., Pierce Chemical Co., Rockford, IL (1984) and G. Barany and R. B. Merrifield, The Peptides: Analysis, Synthesis, Biology, editors E. Gross and J.
• the peptides can also be produced by recombinant techniques, known in the art.
• a DNA sequence encoding the peptide in question can be synthesized using standard methods. See, e.g. , Edge (1981) Nature 292:756: Nambair et al. (1984) Science 223:1299; Jay et al. (1984) J. Biol. Chem. 259:6311. In general, one will select preferred codons for the intended host in which the sequence will be expressed.
• the sequence can be derived from genomic or cDNA.
• the DNA is cloned into an appropriate expression vector, either procaryotic or eucaryotic, using conventional methods, host cells transformed therewith and cultured under conditions allowing for expression of the protein of interest.
• the peptides may also be produced by enzymatic or chemical cleavage of the purified IL8 receptor or a polypeptide having the desired sequence. Such procedures are conventional and well-known in the art.
• the inhibitors of the present invention can be polyclonal and monoclonal antibodies that can be made in vitro or in vivo. Methods of making such antibodies are known in the art.
• Polyclonal antibodies against these peptides are generated by immunizing a suitable animal, such as a mouse, rat, rabbit, sheep or goat, with the peptide of interest.
• a suitable animal such as a mouse, rat, rabbit, sheep or goat
• the peptide can be linked to a carrier prior to immunization.
• Suitable carriers are typically large, slowly metabolized macromolecules such as proteins, polysaccharides, poly lactic acids, polyglycolic acids, polymeric amino acids, amino acid copolymers, lipid aggregates (such as oil droplets or liposomes), and inactive virus particles.
• lipid aggregates such as oil droplets or liposomes
• the peptide may be conjugated to a bacterial toxoid, such as toxoid from diphtheria, tetanus, cholera, etc. , in order to enhance the immunogenicity thereof.
• Immunization is generally performed by mixing or emulsifying the protein in saline, preferably in an adjuvant such as Freund's com ⁇ plete adjuvant, and injecting the mixture or emulsion parenterally (generally sub- cutaneously or intramuscularly). The animal is generally boosted 2-6 weeks later with one or more injections of the protein in saline, preferably using Freund's incomplete adjuvant. Antibodies may also be generated by in vitro immunization, using methods known in the art. Polyclonal antisera is then obtained from the immunized animal.
• Monoclonal antibodies are generally prepared using the method of Kohler and Milstein, Nature (1975) 256:495-96, or a modification thereof.
• a mouse or rat is immunized as described above.
• the spleen (and optionally several large lymph nodes) is removed and dissociated into single cells.
• the spleen cells may be screened (after removal of nonspecifically adherent cells) by applying a cell suspension to a plate or well coated with the protein antigen.
• B-cells, expressing membrane-bound immunoglobulin specific for the antigen will bind to the plate, and are not rinsed away with the rest of the suspension.
• Resulting B-cells, or all dissociated spleen cells are then induced to fuse with myeloma cells to form hybridomas, and are cultured in a selective medium (e.g. , hypoxanthine, aminopterin, thymidine medium, "HAT").
• a selective medium e.g. , hypoxanthine, aminopterin, thymidine medium, "HAT”
• the resulting hybridomas are plated by limiting dilution, and are assayed for the production of antibodies which bind spe ⁇ cifically to the immunizing antigen (and which do not bind to unrelated antigens).
• the selected monoclonal antibody-secreting hybridomas are then cultured either in vitro (e.g. , in tissue culture bottles or hollow fiber reactors), or in vivo (as ascites in mice).
• Functional fragments of the antibody inhibitors will also find use with the present invention and can be produced by cleaving a constant region, not responsible for antigen binding, from the antibody molecule, using e.g. , pepsin, to produce F(ab') 2 fragments. These fragments will contain two antigen binding sites, but lack a portion of the constant region from each of the heavy chains.
• Fab fragments comprising a single antigen binding site, can be produced, e.g. , by digestion of polyclonal or monoclonal antibodies with papain.
• Functional fragments, including only the variable regions of the heavy and light chains can also be produced, using standard techniques. These fragments are known as F v .
• Chimeric or humanized antibodies can also be produced for use in the present invention. These antibodies can be designed to minimize unwanted immunological reactions attributable to heterologous constant and species-specific framework variable regions typically present in monoclonal and polyclonal antibodies. For example, if the antibodies are to be used as IL8 inhibitors in human subjects, chimeric antibodies can be created by replacing non-human constant regions, in either the heavy and light chains, or both, with human constant regions, using techniques generally known in the art. See, e.g. , Winter, G. and Milstein, C. (1991) Nature 349:293-299; Jones, P.T. et al. (1986) Nature 321:522-525; Riechmann, L. et al. (1988) 332:323-327; and Carter, P. et al. (1992) Proc. Natl. Acad. Sci. USA 89:4285-4289.
• peptide libraries can be constructed and screened for peptides having the ability to bind with the IL8 receptor and inhibit IL8 binding thereto (see e.g. , Zuckermann et al. J. Mol. Biol. (1992) 227:711-718 for a description of the production of peptide libraries.)
• peptides, peptide mixtures and peptoids can be synthesized or generated by biological means and tested for their ability to inhibit IL8 binding to the receptor (see, e.g., Zuckermann et al.
• the above preparations can be tested for their ability to bind the IL8 receptor and modulate IL8 receptor-mediated activity, using known assays.
• the substances can be tested for their ability to compete with IL8 for receptor binding using competition assays, such as the radioimmunoassays described in Gayle et al , J. Biol. Chem. (1993) 268:7283-7289; and LaRosa et al , J.
• WO93/06229 (published 1 April 1993); Bazzoni, F. et al. (1991) J. Exp. Med. 173:771-774; Peveri, P. et al. (1988) J. Exp. Med. 167: 1547-1559).
• Other measurements of IL8 mediated activity include neutrophil chemotaxic assays (see, e.g. , Schroder, J.M. et al. (1987) J. Immunol 139:3474-3483; Fincham, N.J. et al. (1988) J. Immunol. 140:4294-4299: Larson, C.G. et al. (1989) Science 243:1464-1466; Grob, P.M.
• Antibody inhibitors of the present invention are not only useful as modulators of IL8 activity, but may be used to identify homologous IL8 receptor genes in other vertebrate species and to immunopurify the IL8 receptor from sources producing the same.
• the antibodies can also be used as targeting agents to deliver other IL8 agonists and antagonists to IL8 binding sites.
• the antibodies can be conjugated to these agents or fusion proteins, including at least the active binding region of the antibody linked to a least a functionally active portion of an IL8 inhibitor, can be constructed using recombinant DNA techniques well known in the art.
• the inhibitors of the present invention can be provided in pharmaceutical compositions for inhibiting IL8 binding to its receptor and modulating an IL8 receptor-mediated biological response.
• the compositions will generally include one or more "pharmaceutically acceptable excipients or vehicles" such as water, saline, glycerol, ethanol, etc. Additionally, auxiliary substances, such as wetting or emulsifying agents, pH buffering substances, and the like, may be present in such vehicles.
• compositions comprise an effective inhibiting or modulating amount of an IL8 inhibitor, as defined above.
• the compositions are conventionally administered parenterally, e.g. , by injection, either intravenously, subcutaneously, intramuscularly or intraperitonealy. Additional formulations suitable for other modes of administration include oral and pulmonary formulations, suppositories, and transdermal applications. Dosage treatment may be a single dose schedule or a multiple dose schedule.
• Example 1 Peptide and Antisera Preparation Peptide synthesis, conjugation to toxoids, immunization of mice and sheep and determination of ELISA reactivity against pin-coupled and plate-coated peptide were performed by Chiron Mimotopes Pty. Ltd. (Clayton, Victoria 3168, Australia) employing standard procedures.
• peptides having substantial homology to portions of the amino-terminal extracellular region of human IL8 receptors IL8R1 and EL8R2, as shown in Tables 1 and 2 were synthesized using standard techniques.
• N-terminal acetyl or C-terminal ⁇ -alanine- diketopeperazine groups are blocking groups to mimic the environment of the peptide sequence within the protein.
• Antisera were raised in mice against peptides #1 and #3 and in sheep against peptide #1 ( Figure 1, Table 1). Antisera to the IL8R2 amino-terminal extracellular domain were raised in mice against peptides #6 and #7 and in sheep against a mixture of peptides, #10, #11, #12, #13 ( Figure 1, Table 2). Immune sera, but not preimmune sera nor antisera against peptides #6 and #7, showed high titer against the immunizing peptide(s) as determined by E ISA against the peptide on pins and/or coated on plates. Technical difficulties were cited by the manufacturer as the explanation for lack of immunoactivity of antisera against immunizing peptides #6 and #7. These particular antisera were not pursued and antisera against peptides #10-13 were used instead.
• Antisera were either used untreated, or were purified either by chromatography on Protein G Agarose (Pharmacia) or by affinity chromatography on peptide #1 Sepharose (for anti IL8RI immune sera) or peptide #10 Sepharose (for anti-IL8R2 immune sera). Peptides conjugated to Sepharose were prepared by Chiron Mimotopes. Table 1
• Neutrophil IL8 Receptor Recognition Assays Antibodies were tested for their ability to recognize neutrophils as follows. Neutrophils were isolated from whole blood using Neutrophil Isolation Media (NIM) (Cardinal) essentially as described by the manufacturer with the following modifications. 20 ml NIM and 30 ml blood in 50 ml tubes were centrifuged for 50 minutes. Contaminating red blood cells were removed by lysis in ice cold water. The resulting neutrophils were resuspended in Hank's Buffered Saline (HBS) and stored on ice. Neutrophils were incubated and subjected to FACS analysis as follows.
• NIM Neutrophil Isolation Media
• HBS Hank's Buffered Saline
• Neutrophils were stained for FACS analysis by resuspending 1 x 10 6 cells in 50 ⁇ of sheep pre-immune IgG ( Figures 2 A and 2C), anti-IL8Rl peptide IgG ( Figure 2B) or anti-IL8R2 peptide IgG ( Figure 2D), each diluted 1:150 in PBS +1 % BSA. Cells were incubated 2 hours on ice, centrifuged at 1000 RPM for 5 minutes and then washed twice with PBS + 1 % BSA.
• Washed cells were resuspended in 50 ⁇ FITC-conjugated F(ab') 2 fragment rabbit anti-sheep IgG (H+L) antibody (1:100 in PBS + 1 % BSA, Jackson ImmunoResearch Laboratories). Cells were incubated 1 hour on ice, centrifuged at 1000 RPM for 5 minutes, washed in PBS + 1 % BSA and then washed in PBS. Cells to be analyzed immediately were suspended in 500 ml of PBS. Propidium iodide was added at 2.5 ng/ml as a viability stain.
• Neutrophils could be fixed in 1 % paraformaldehyde and analyzed up to 72 hours later. Labelled cells were analyzed on a FACS CAN (Becton Dickonson).
• Antibodies were tested for their ability to block the binding of IL8 to its receptor as follows.
• IL8R1 and IL8R2, for use in the receptor binding assays, were produced recombinantly.
• DNA encoding IL8R1 and IL8R2 was isolated from human genomic DNA by PCR using oligonucleotide primers based on published sequences for IL8R1 (Holmes et al. Science (1991) 253:1278) and
• IL8R2 (Murphy and Tiffany, Science (1991) 253:1280). The nucleotide sequence of the isolated genes was confirmed by dideoxy sequencing.
• IL8R1 in baculovirus transfer vector pVL1392, Invitrogen
• IL8R2 in the pAcC13 transfer vector described in Munemitsu et al. Mol. Cell. Biol. (1990) 10:5977
• AcNPV Autographa California baculovirus
• Recombinant baculovirus were isolated by plaque purification (Smith et al. Mol. Cell. Biol.
• Sf9 insect cells were infected with recombinant IL8R1 or IL8R2 baculovirus and seeded into 96-well Remova-wells culture plates in ExCell 400 media.
• culture medium was removed and cell monolayers were pretreated for 1 hour at room temperature with antibody in Hepes-BSA binding buffer (25 mM Hepes, pH7.5, 150 mM NaCl, 5 mM CaCl 2) 5mM Mg 1 mg/mL bovine serum albumin).
• 125 I-IL8 was added to give 0.2 nM final concentration and incubation was continued at room temperature for 3 hour.
• Antiserum to IL8R1 peptide #1 blocked binding of 125 I-IL8 to IL8R1 receptors expressed on recombinant baculovirus- infected Sf9 cells (Figure 3). Antiserum to IL8R1 peptide #1 did not inhibit binding of IL8 to IL8R2 ( Figure 5). Therefore this antiserum specifically neutralized IL8 binding to IL8R1.
• the epitope on the IL8R1 recognized by anti- IL8R1 peptide #1 antibodies is near to or overlapping the E 8 recognition site on IL8R1.
• Antiserum to peptides #10-13 was fractionated by peptide #10 affinity chromatography. Antibodies to IL8R2 peptide #10 inhibited IL8 binding to IL8R2 receptors expressed on Sf9 cells ( Figure 6). Free peptide #10 blocked neutralization by this antibody and confirmed that peptide #10 includes epitope(s) at or near to the IL8 recognition site on IL8R2 ( Figure 6). This corresponds to a neutralizing epitope(s) within the region of amino acid residues 1-15 of the IL8R2. Depletion of anti-peptide #10 antibodies did not abolish the ability of the anti- IL8R2 peptide antiserum to inhibit IL8 binding to IL8R2 (data not shown).
• amino acids 1-41 in the amino-terminal extracellular domain of IL8R2 include sequences involved in the recognition of IL8.

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