title: IL-17B and IL-17C are associated with TNF-alpha production and contribute to the exacerbation of inflammatory arthritis.
abstract: IL-17A is a T cell-derived proinflammatory cytokine that contributes to the pathogenesis of rheumatoid arthritis. Recently, six related molecules have been identified to form the IL-17 family, as follows: IL-17A, IL-17B, IL-17C, IL-17D, IL-17E, and IL-17F. Whereas IL-17A and IL-17F up-regulate IL-6 in synovial fibroblasts, IL-17B and IL-17C are reported to stimulate the release of TNF-alpha and IL-1beta from the monocytic cell line, THP-1 cell. However, their detailed function remains to be elucidated. We report in this study the effects of IL-17 family on the collagen-induced arthritis (CIA) progression by T cell gene transfer and bone marrow chimeric mice. The mRNA expressions of IL-17 family (IL-17A, IL-17B, IL-17C, and IL-17F) and their receptor (IL-17R and IL-17Rh1) genes in the arthritic paws of CIA mice were elevated compared with controls. Although IL-17A and IL-17F were expressed in CD4(+) T cells, IL-17B and IL-17C were expressed in the cartilage and in various cell populations in the CIA arthritic paws, respectively. In vitro, IL-17A, IL-17B, IL-17C, and IL-17F induced TNF-alpha production in mouse peritoneal exudate cells. In vivo, adoptive transfer of IL-17B- and IL-17C-transduced CD4(+) T cells evidently exacerbated arthritis. Bone marrow chimeric mice of IL-17B and IL-17C exhibited elevated serum TNF-alpha concentration and the high arthritis score upon CIA induction. Moreover, neutralization of IL-17B significantly suppressed the progression of arthritis and bone destruction in CIA mice. Therefore, not only IL-17A, but also IL-17B and IL-17C play an important role in the pathogenesis of inflammatory arthritis.
authors.affiliation: Department of Allergy and Rheumatology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan.
authors.forename: Yumi
authors.initials: Y
authors.lastname: Yamaguchi
authors.forename: Keishi
authors.initials: K
authors.lastname: Fujio
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Shoda
authors.forename: Akiko
authors.initials: A
authors.lastname: Okamoto
authors.forename: Nelson H
authors.initials: NH
authors.lastname: Tsuno
authors.forename: Koki
authors.initials: K
authors.lastname: Takahashi
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Yamamoto
mesh_terms: D019264:Adoptive Transfer; D000818:Animals; D001169:Arthritis, Experimental / Q000235:genetics / Q000276:immunology* / Q000378:metabolism / Q000473:pathology; D016026:Bone Marrow Transplantation; D001862:Bone Resorption / Q000235:genetics / Q000276:immunology / Q000378:metabolism / Q000473:pathology; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology / Q000378:metabolism / Q000473:pathology; D002460:Cell Line; D006801:Humans; D020381:Interleukin-17 / Q000235:genetics / Q000276:immunology* / Q000378:metabolism; D015850:Interleukin-6 / Q000096:biosynthesis / Q000276:immunology; D051379:Mice; D053722:Receptors, Interleukin-17 / Q000276:immunology / Q000378:metabolism; D014161:Transduction, Genetic; D018183:Transplantation Chimera / Q000235:genetics / Q000276:immunology / Q000378:metabolism; D014409:Tumor Necrosis Factor-alpha / Q000096:biosynthesis / Q000276:immunology*
chemical_list: C515929:Il17b protein, mouse; C515930:Il17c protein, mouse; C491673:Il17ra protein, mouse; D020381:Interleukin-17; D015850:Interleukin-6; D053722:Receptors, Interleukin-17; D014409:Tumor Necrosis Factor-alpha