Filamin B represses chondrocyte hypertrophy in a Runx2/Smad3-dependent manner.

Filamin B represses chondrocyte hypertrophy in a Runx2/Smad3-dependent manner.
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DOI:
10.1083/jcb.200703113
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发表时间:
2007-07-02
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Justice MJ
Justice MJ
中科院分区:
其他
文献类型:
--
作者:
Zheng L;Baek HJ;Karsenty G;Justice MJ

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编码一种细胞质肌动蛋白结合蛋白的纤连蛋白B在几种骨骼发育不良中发生突变。为了进一步研究肌动蛋白结合蛋白如何影响骨骼发生,我们产生了缺乏完整细丝蛋白B的小鼠。正如在脊椎腕跗关节骨性结合综合征患者中观察到的,细丝蛋白B突变小鼠在许多软骨成分中显示异位矿化。这种异常矿化是由于异位软骨细胞肥大,类似于在软骨细胞中表达Runx2的小鼠中所见。因此,去除Runx 2的一个拷贝挽救了细丝蛋白B突变体表型,表明细丝蛋白B是软骨细胞分化期间Runx 2功能的调节剂。细丝蛋白B结合已知与Runx2相互作用的Smad3。Smad3磷酸化在突变小鼠中增加。因此,细丝蛋白B至少部分通过Smad 3途径抑制Runx 2活性。我们的研究结果揭示了软骨形成过程中肌动蛋白结合蛋白的参与,并为人类遗传性疾病提供了分子基础。
FILAMIN B, which encodes a cytoplasmic actin binding protein, is mutated in several skeletal dysplasias. To further investigate how an actin binding protein influences skeletogenesis, we generated mice lacking intact Filamin B. As observed in spondylocarpotarsal synostosis syndrome patients, Filamin B mutant mice display ectopic mineralization in many cartilaginous elements. This aberrant mineralization is due to ectopic chondrocyte hypertrophy similar to that seen in mice expressing Runx2 in chondrocytes. Accordingly, removing one copy of Runx2 rescues the Filamin B mutant phenotype, indicating that Filamin B is a regulator of Runx2 function during chondrocyte differentiation. Filamin B binds Smad3, which is known to interact with Runx2. Smad3 phosphorylation is increased in the mutant mice. Thus, Filamin B inhibits Runx2 activity, at least in part, through the Smad3 pathway. Our results uncover the involvement of actin binding proteins during chondrogenesis and provide a molecular basis to a human genetic disease.
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