Interferon regulatory factor-8 regulates bone metabolism by suppressing osteoclastogenesis.
Interferon regulatory factor-8 regulates bone metabolism by suppressing osteoclastogenesis.
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Bone metabolism results from a balance between osteoclast-driven bone resorption and osteoblast-mediated bone formation. Diseases such as periodontitis and rheumatoid arthritis are characterized by increased bone destruction due to enhanced osteoclastogenesis. Here we report that interferon regulatory factor 8 (IRF8), a transcription factor expressed in immune cells, is a key regulatory molecule for osteoclastogenesis. IRF8 expression in osteoclast precursors was downregulated during the initial phase of osteoclast differentiation induced by receptor activator of nuclear factor κB ligand (RANKL, also called TRANCE, ODF, and OPGL), which is encoded by the Tnfsf11 gene. Mice deficient in IRF8 exhibited severe osteoporosis due to increased numbers of osteoclasts, and enhanced bone destruction following lipopolysaccharide (LPS) administration. Irf8–/– osteoclast precursors underwent increased osteoclastogenesis in response to RANKL and tumor necrosis factor α (TNFα). IRF8 suppressed osteoclastogenesis by inhibiting the function and expression of nuclear factor of activated T cells c1 (NFATc1). Our results show that IRF8 inhibits osteoclast formation under physiological and pathological conditions, and suggest a model where downregulation of inhibitory factors like IRF8 contributes to RANKL-mediated osteoclastogenesis.
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DOI:
10.1073/pnas.87.10.3743
发表时间:
1990-05-01
影响因子:
11.1
作者:
DRIGGERS, PH;ENNIST, DL;OZATO, K
通讯作者:
OZATO, K
影响因子:
15.3
作者:
Kim, N;Kadono, Y;Choi, Y
通讯作者:
Choi, Y
影响因子:
64.8
作者:
Takayanagi, H;Ogasawara, K;Taniguchi, T
通讯作者:
Taniguchi, T
影响因子:
4.4
作者:
Tsujimura, H;Tamura, T;Ozato, K
通讯作者:
Ozato, K
DOI:
10.1084/jem.20011681
发表时间:
2002-01-21
期刊:
The Journal of experimental medicine
影响因子:
--
作者:
Kim N;Takami M;Rho J;Josien R;Choi Y
通讯作者:
Choi Y