Erk1 positively regulates osteoclast differentiation and bone resorptive activity.

Erk1 positively regulates osteoclast differentiation and bone resorptive activity.
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DOI:
10.1371/journal.pone.0024780
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发表时间:
2011
期刊:
影响因子:
3.7
通讯作者:
Yang FC
Yang FC
中科院分区:
综合性期刊3区
文献类型:
--
作者:
He Y;Staser K;Rhodes SD;Liu Y;Wu X;Park SJ;Yuan J;Yang X;Li X;Jiang L;Chen S;Yang FC

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细胞外信号调节激酶(ERK1 和 2)广泛表达,它们调节多个细胞谱系的增殖、存活、分化和蛋白质合成。在几种具有骨骼表型的遗传性疾病中发现了 ERK1/2 信号改变,包括努南综合征、1 型神经纤维瘤病和心脏-面部-皮肤综合征,这表明 MEK-ERK 信号调节人类骨骼发育。在这里,我们研究了 Erk1 和 Erk2 破坏破骨细胞(吸收骨的特殊巨噬细胞/单核细胞谱系衍生细胞)多种功能的后果。我们证明 Erk1 积极调节破骨细胞发育和骨吸收活性,因为 Erk1 的遗传破坏减少了破骨细胞祖细胞数量,损害了凹坑形成,并减少了 M-CSF 介导的粘附和迁移。此外,与移植了 WT 和 Erk2−/− BMMNC 的受者相比,用 Erk1−/− 骨髓单核细胞 (BMMNC) 长期重建的 WT 小鼠表现出骨矿物质密度增加,这表明骨髓自主的、Erk1 依赖性破骨细胞功能。这些数据表明 Erk1 在破骨细胞功能中发挥重要作用,同时为开发 Erk1 特异性抑制剂以进行实验研究和/或异常破骨细胞功能的治疗调节提供了理论基础。
The extracellular signal-regulated kinases (ERK1 and 2) are widely-expressed and they modulate proliferation, survival, differentiation, and protein synthesis in multiple cell lineages. Altered ERK1/2 signaling is found in several genetic diseases with skeletal phenotypes, including Noonan syndrome, Neurofibromatosis type 1, and Cardio-facio-cutaneous syndrome, suggesting that MEK-ERK signals regulate human skeletal development. Here, we examine the consequence of Erk1 and Erk2 disruption in multiple functions of osteoclasts, specialized macrophage/monocyte lineage-derived cells that resorb bone. We demonstrate that Erk1 positively regulates osteoclast development and bone resorptive activity, as genetic disruption of Erk1 reduced osteoclast progenitor cell numbers, compromised pit formation, and diminished M-CSF-mediated adhesion and migration. Moreover, WT mice reconstituted long-term with Erk1−/− bone marrow mononuclear cells (BMMNCs) demonstrated increased bone mineral density as compared to recipients transplanted with WT and Erk2−/− BMMNCs, implicating marrow autonomous, Erk1-dependent osteoclast function. These data demonstrate Erk1 plays an important role in osteoclast functions while providing rationale for the development of Erk1-specific inhibitors for experimental investigation and/or therapeutic modulation of aberrant osteoclast function.
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