Interferon regulatory factor-8 regulates bone metabolism by suppressing osteoclastogenesis.

Interferon regulatory factor-8 regulates bone metabolism by suppressing osteoclastogenesis.
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DOI:
10.1038/nm.2007
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发表时间:
2009-09
期刊:
影响因子:
82.9
通讯作者:
--
中科院分区:
医学1区
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--
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骨代谢是由破骨细胞驱动的骨吸收和成骨细胞介导的骨形成之间的平衡引起的。牙周炎和类风湿性关节炎等疾病的特征在于由于破骨细胞生成增强而导致的骨破坏增加。在这里,我们报告,干扰素调节因子8(IRF 8),在免疫细胞中表达的转录因子,是破骨细胞生成的关键调节分子。在由Tnfsf 11基因编码的核因子κB配体受体激活剂(RANKL,也称为TRANCE、ODF和OPGL)诱导的破骨细胞分化的初始阶段,破骨细胞前体中的IRF 8表达下调。IRF 8缺陷的小鼠表现出严重的骨质疏松症,这是由于破骨细胞数量增加,以及脂多糖(LPS)给药后骨破坏增强。Irf 8-/-破骨细胞前体细胞对RANKL和肿瘤坏死因子α(TNFα)的反应是破骨细胞生成增加。IRF 8通过抑制活化T细胞核因子c1(NFATc 1)的功能和表达而抑制破骨细胞的生成。我们的研究结果表明,IRF 8抑制破骨细胞的形成在生理和病理条件下,并提出了一个模型,如IRF 8的抑制因子的下调有助于RANKL介导的破骨细胞生成。
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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