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Original Article |
Stimulates Osteoclast Differentiation by a Mechanism Independent of the ODF/RANKLRANK Interaction
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-CSFdependent bone marrow macrophages (M-BMM
) appeared within 3 d. Tartrate-resistant acid phosphatasepositive osteoclasts were also formed when M-BMM
were further cultured for 3 d with mouse tumor necrosis factor
(TNF-
) in the presence of M-CSF. Osteoclast formation induced by TNF-
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 antiRANK (ODF/RANKL receptor) antibody. Experiments using M-BMM
prepared from TNFR1- or TNFR2-deficient mice showed that both TNFR1- and TNFR2-induced signals were important for osteoclast formation induced by TNF-
. Osteoclasts induced by TNF-
formed resorption pits on dentine slices only in the presence of IL-1
. These results demonstrate that TNF-
stimulates osteoclast differentiation in the presence of M-CSF through a mechanism independent of the ODF/RANKLRANK system. TNF-
together with IL-1
may play an important role in bone resorption of inflammatory bone diseases.
Key Words:
bone resorption, tumor necrosis factor receptor, nuclear factor-
B, macrophage colony-stimulating factor, interleukin-1
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