TAK1 mediates BMP signaling in cartilage.

TAK1 mediates BMP signaling in cartilage.
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DOI:
10.1111/j.1749-6632.2009.05222.x
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发表时间:
2010-03
影响因子:
5.2
通讯作者:
Glimcher LH
Glimcher LH
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Greenblatt MB;Shim JH;Glimcher LH

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虽然许多信号能够在体外激活软骨细胞中的MAPK信号级联,但这些通路的功能在体内仍不清楚。在这里,我们报告了小鼠的表型与TGF-β激活激酶1(TAK 1),MAP 3 K家族成员的条件性缺失,在软骨中使用胶原2α启动子。这些小鼠表现出软骨发育不良,其特征为关节突发病性侏儒、继发性骨化中心形成延迟以及手肘关节和跗关节形成缺陷。这种缺陷类似于缺乏参与BMP家族成员信号传导的受体或配体的小鼠的表型。来自这些小鼠的软骨细胞在体内和体外显示出缺陷BMP信号传导的证据。令人惊讶的是,TAK 1的缺失似乎不仅影响p38 MAPK信号级联的激活,而且还影响BMP响应性Smad 1/5/8的激活。生化分析表明,TAK 1可以与Smad蛋白相互作用,并通过磷酸化促进其活化,揭示了以前未被识别的MAPK和BMP信号的Smad臂之间的串扰。
Although many signals are capable of activating MAPK signaling cascades in chondrocytes in vitro, the function of these pathways remains unclear in vivo. Here we report the phenotype of mice with a conditional deletion of TGF-β-activated kinase 1 (TAK1), a MAP3K family member, in cartilage using the collagen 2α promoter. These mice display chondrodysplasia characterized by neonatal-onset runting, delayed formation of secondary ossification centers, and defects in formation of the elbow and tarsal joints. This constellation of defects resembles the phenotype of mice deficient for receptors or ligands involved in signaling by BMP family members. Chondrocytes from these mice show evidence of defective BMP signaling in vivo and in vitro. Surprisingly, deletion of TAK1 seems to affect not only activation of the p38 MAPK signaling cascade, but also activation of the BMP-responsive Smad1/5/8. Biochemical analysis suggests that TAK1 can interact with Smad proteins and promote their activation through phosphorylation, revealing a previously unrecognized crosstalk between the MAPK and Smad arms of BMP signaling.
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