The Journal of Experimental Medicine
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© The Rockefeller University Press, 0022-1007/2000/1/275/ $5.00
The Journal of Experimental Medicine, Volume 191, Number 2, January 17, 2000 275-286


Original Article

Tumor Necrosis Factor {alpha} Stimulates Osteoclast Differentiation by a Mechanism Independent of the ODF/RANKL–RANK Interaction

Kanichiro Kobayashia, Naoyuki Takahashia, Eijiro Jimia, Nobuyuki Udagawaa, Masamichi Takamia, Shigeru Kotakeb, Nobuaki Nakagawac, Masahiko Kinosakic, Kyoji Yamaguchic, Nobuyuki Shimac, Hisataka Yasudac, Tomonori Morinagac, Kanji Higashioc, T. John Martind, and Tatsuo Sudaa
a Department of Biochemistry, School of Dentistry, Showa University, Tokyo 142-8555, Japan
b The Institute of Rheumatology, Tokyo Women's Medical University, Tokyo 162-0054, Japan
c Research Institute of Life Science, Snow Brand Milk Products Co., Ltd., Tochigi 329-0512, Japan
d St. Vincent's Institute of Medical Research, Fitzroy, Victoria 3065, Australia

Correspondence to: Tatsuo Suda, Department of Biochemistry, School of Dentistry, Showa University, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo 142-8555, Japan. Tel:81-3-3784-8162 Fax:81-3-3784-5555 E-mail:suda{at}showa-u.ac.jp.

Osteoclast differentiation factor (ODF, also called RANKL/TRANCE/OPGL) stimulates the differentiation of osteoclast progenitors of the monocyte/macrophage lineage into osteoclasts in the presence of macrophage colony-stimulating factor (M-CSF, also called CSF-1). When mouse bone marrow cells were cultured with M-CSF, M-CSF–dependent bone marrow macrophages (M-BMM{phi}) appeared within 3 d. Tartrate-resistant acid phosphatase–positive osteoclasts were also formed when M-BMM{phi} were further cultured for 3 d with mouse tumor necrosis factor {alpha} (TNF-{alpha}) in the presence of M-CSF. Osteoclast formation induced by TNF-{alpha} was inhibited by the addition of respective antibodies against TNF receptor 1 (TNFR1) or TNFR2, but not by osteoclastogenesis inhibitory factor (OCIF, also called OPG, a decoy receptor of ODF/RANKL), nor the Fab fragment of anti–RANK (ODF/RANKL receptor) antibody. Experiments using M-BMM{phi} prepared from TNFR1- or TNFR2-deficient mice showed that both TNFR1- and TNFR2-induced signals were important for osteoclast formation induced by TNF-{alpha}. Osteoclasts induced by TNF-{alpha} formed resorption pits on dentine slices only in the presence of IL-1{alpha}. These results demonstrate that TNF-{alpha} stimulates osteoclast differentiation in the presence of M-CSF through a mechanism independent of the ODF/RANKL–RANK system. TNF-{alpha} together with IL-1{alpha} may play an important role in bone resorption of inflammatory bone diseases.

Key Words: bone resorption, tumor necrosis factor receptor, nuclear factor-{kappa}B, macrophage colony-stimulating factor, interleukin-1


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