Specific residues of RUNX2 are obligatory for formation of BMP2-induced RUNX2-SMAD complex to promote osteoblast differentiation.

Specific residues of RUNX2 are obligatory for formation of BMP2-induced RUNX2-SMAD complex to promote osteoblast differentiation.
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DOI:
10.1159/000151719
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发表时间:
2009
期刊:
Cells, tissues, organs
影响因子:
--
通讯作者:
Lian JB
Lian JB
中科院分区:
其他
文献类型:
--
作者:
Javed A;Afzal F;Bae JS;Gutierrez S;Zaidi K;Pratap J;van Wijnen AJ;Stein JL;Stein GS;Lian JB

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BMP-2信号传导和RUNX 2调节途径会聚在一起,用于体内骨形成的转录控制。SMAD蛋白通过Runx 2中的重叠NMTS/SMID序列(391-432)募集至RUNX 2调节复合物。为了确定RUNX 2-SMAD相互作用对成骨细胞发生的贡献,我们表征了点突变体的数量。只有氨基酸426-428的三重突变(HTY-AAA)导致RUNX 2与BMP 2或TGFβ响应性SMAD的相互作用的丧失,并且未能将BMP 2/TGFβ信号整合到靶基因启动子上。在Runx 2无效细胞重建试验中,HTY突变体没有激活响应BMP 2信号传导的成骨细胞分化程序(ALP、COL-1、OP、BSP和OC)。因此,亚核靶向功能和RUNX 2-SMAD成骨复合物的形成在功能上是不可分割的。总之,这些研究提供了直接证据,证明RUNX 2对于成骨细胞分化的BMP 2信号的执行和完成是必不可少的。
BMP-2 signaling and RUNX2 regulatory pathways converge for transcriptional control of bone formation in vivo. SMAD proteins are recruited to RUNX2 regulatory complex via an overlapping NMTS/SMID sequence (391-432) in Runx2. To establish the contribution of RUNX2-SMAD interaction to osteoblastogenesis, we characterized number of point mutants. Only a triple mutation of amino-acids 426-428 (HTY-AAA) results in loss of RUNX2 interactions with either BMP2 or TGFβ responsive SMADs and failed to integrate the BMP2/TGFβ signal on target gene promoters. In a Runx2 null cell reconstitution assay, the HTY mutant did not activate the program of osteoblast differentiation (ALP, COL-1, OP, BSP, and OC) in response to BMP2 signaling. Thus subnuclear targeting function and formation of a RUNX2-SMAD osteogenic complex are functionally inseparable. Taken together these studies provide direct evidence that RUNX2 is essential for execution and completion of BMP2 signal for osteoblast differentiation.
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