Abstract: The present invention provides isolated and purified polynucleotides and polypeptides related to the IL-17F signaling pathway. The invention also provides antibodies to IL-17F homodimers and IL-17A/IL-17F heterodimers, and methods of isolating and purifying members of the IL-17 family, including IL-17A/IL-17F heterodimers, from a natural source. The present invention also is directed to novel methods for diagnosing, prognosing, monitoring the progress of, and treating and/or preventing disorders related to IL-17F signaling, i.e., IL-17F-associated disorders, including, but not limited to, inflammatory disorders, such as autoimmune diseases (e.g., arthritis (including rheumatoid arthritis), psoriasis, systemic lupus erythematosus, and multiple sclerosis), respiratory diseases (e.g., COPD, cystic fibrosis, asthma, allergy), transplant rejection (including solid organ transplant rejection), and inflammatory bowel diseases or disorders (IBDs, e.g., ulcerative colitis, Crohn's disease).

Abstract: The present invention provides isolated and purified polynucleotides and polypeptides related to the IL-17F signaling pathway. The invention also provides antibodies to IL-17F homodimers and IL-17A/IL-17F heterodimers, and methods of isolating and purifying members of the IL-17 family, including IL-17A/IL-17F heterodimers, from a natural source. The present invention also is directed to novel methods for diagnosing, prognosing, monitoring the progress of, and treating and/or preventing disorders related to IL-17F signaling, i.e., IL-17F-associated disorders, including, but not limited to, inflammatory disorders, such as autoimmune diseases (e.g., arthritis (including rheumatoid arthritis), psoriasis, systemic lupus erythematosus, and multiple sclerosis), respiratory diseases (e.g., COPD, cystic fibrosis, asthma, allergy), transplant rejection (including solid organ transplant rejection), and inflammatory bowel diseases or disorders (IBDs, e.g., ulcerative colitis, Crohn's disease).

Abstract: The invention provides a novel mouse IL-17F/IL-17A, and further provides uses of such mouse IL-17F/IL-17A in the characterization of the IL-17F/IL-17A heterodimer. The present invention is also related to polynucleotides and polypeptides of the IL-17F/IL-17A signaling pathway, and targeting of the IL-17F/IL-17A signaling pathway in methods of treating IL-17F/IL-17A-associated disorders. The invention thus provides methods of using isolated IL-17F/IL-17A heterodimer, e.g., in a mouse model of airway inflammation, and specific or selective IL-17F/IL-17A modulators (e.g., signaling agonists or signaling antagonists (e.g., specific or selective antagonistic antibodies, specific or selective antagonistic small molecules, etc.)). The invention also provides methods of screening for compounds capable of modulating IL-17F/IL-17A biological activity, e.g., IL-17F/IL-17A signaling antagonists (e.g.