title: IL-23 induces human osteoclastogenesis via IL-17 in vitro, and anti-IL-23 antibody attenuates collagen-induced arthritis in rats.
abstract: This study demonstrates that IL-23 stimulates the differentiation of human osteoclasts from peripheral blood mononuclear cells (PBMC). Furthermore, in vivo blockade of endogenous IL-23 activity by treatment with anti-IL-23 antibody attenuates collagen-induced arthritis in rats by preventing both inflammation and bone destruction. IL-23 induced human osteoclastogenesis in cultures of PBMC in the absence of osteoblasts or exogenous soluble-receptor activator of NF-kappaB ligand (RANKL). This IL-23-induced osteoclastogenesis was inhibited by osteoprotegerin, anti-IL-17 antibody, and etanercept, suggesting that RANKL, IL-17, and TNF-alpha are involved. In addition, we found the ratio of production levels of IL-17 to those of IFN-gamma from activated human T cells was elevated at 1 to 10 ng/ml IL-23. The inductive effect of IL-17 and the inhibitory effect of IFN-gamma on osteoclastogenesis indicate that the balance of these two cytokines is particularly important. We also demonstrated that IL-23 administered at a later stage significantly reduced paw volume in rats with collagen-induced arthritis, in a dose-dependent manner. Furthermore, anti-IL-23 antibody reduced synovial tissue inflammation and bone destruction in these rats. These findings suggest that IL-23 is important in human osteoclastogenesis and that neutralizing IL-23 after onset of collagen-induced arthritis has therapeutic potential. Thus, controlling IL-23 production and function could be a strategy for preventing inflammation and bone destruction in patients with rheumatoid arthritis.
authors: Institute of Rheumatology, Tokyo Women's Medical University, 10-22 Kawada-cho, Shinjuku-ku, Tokyo 162-0054, Japan. toruyago@ior.twmu.ac.jp
authors: Toru
authors: T
authors: Yago
authors: Yuki
authors: Y
authors: Nanke
authors: Manabu
authors: M
authors: Kawamoto
authors: Takefumi
authors: T
authors: Furuya
authors: Tsuyoshi
authors: T
authors: Kobashigawa
authors: Naoyuki
authors: N
authors: Kamatani
authors: Shigeru
authors: S
authors: Kotake
mesh_terms: D000818:Animals; D000906:Antibodies / Q000008:administration & dosage; D001169:Arthritis, Experimental / Q000378:metabolism / Q000473:pathology* / Q000517:prevention & control; D002478:Cells, Cultured; D005260:Female; D006801:Humans; D020381:Interleukin-17 / Q000096:biosynthesis* / Q000235:genetics; D053759:Interleukin-23 / Q000037:antagonists & inhibitors / Q000096:biosynthesis* / Q000235:genetics; D010010:Osteoclasts / Q000166:cytology* / Q000378:metabolism; D051381:Rats
chemical_list: D000906:Antibodies; D020381:Interleukin-17; D053759:Interleukin-23