BMP-2 modulates beta-catenin signaling through stimulation of Lrp5 expression and inhibition of beta-TrCP expression in osteoblasts.

BMP-2 modulates beta-catenin signaling through stimulation of Lrp5 expression and inhibition of beta-TrCP expression in osteoblasts.
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DOI:
10.1002/jcb.22319
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发表时间:
2009-11-01
影响因子:
4
通讯作者:
Chen, Di
Chen, Di
中科院分区:
生物学2区
文献类型:
--
作者:
Zhang, Ming;Yan, Ying;Lim, Yong-bin;Tang, Dezhi;Xie, Rong;Chen, Ann;Tai, Peter;Harris, Stephen E.;Xing, Lianping;Qin, Yi-Xian;Chen, Di

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典型的BMP和Wnt信号通路在调节成骨细胞功能和骨形成中起关键作用。最近的研究表明,BMP-2与β-catenin协同作用,促进成骨细胞分化。为了确定典型BMP和Wnt信号通路之间信号互传的分子机制,我们利用原代成骨细胞和成骨前体细胞2T3和MC3T3-E1细胞研究BMP-2对β-catenin信号传导的影响。我们发现BMP-2刺激Lrp5的表达,抑制β-TrCP的表达,β-TrCP是负责β-连环蛋白降解的F-box E3连接酶,随后增加成骨细胞中β-连环蛋白的水平。体外缺失β-catenin基因可抑制成骨细胞增殖,改变成骨细胞分化,降低成骨细胞对BMP-2治疗的反应性。这些发现表明BMP-2可能部分通过调节β-连环蛋白信号传导调节成骨细胞功能。
Canonical BMP and Wnt signaling pathways play critical roles in regulation of osteoblast function and bone formation. Recent studies demonstrate that BMP-2 acts synergistically with β-catenin to promote osteoblast differentiation. To determine the molecular mechanisms of the signaling cross-talk between canonical BMP and Wnt signaling pathways, we have used primary osteoblasts and osteoblast precursor cell lines 2T3 and MC3T3-E1 cells to investigate the effect of BMP-2 on β-catenin signaling. We found that BMP-2 stimulates Lrp5 expression and inhibits the expression of β-TrCP, the F-box E3 ligase responsible for β-catenin degradation and subsequently increases β-catenin protein levels in osteoblasts. In vitro deletion of the β-catenin gene inhibits osteoblast proliferation and alters osteoblast differentiation and reduces the responsiveness of osteoblasts to the BMP-2 treatment. These findings suggest that BMP-2 may regulate osteoblast function in part through modulation of the β-catenin signaling.
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