TGF-β1 signaling targets metastasis-associated protein 1, a new effector in epithelial cells.

TGF-β1 signaling targets metastasis-associated protein 1, a new effector in epithelial cells.
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TGF-β1信号传导靶向与上皮细胞中的新效应子转移相关蛋白1。

DOI:
10.1038/onc.2010.608
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发表时间:
2011-05-12
期刊:
影响因子:
8
通讯作者:
Kumar, R.
Kumar, R.
中科院分区:
医学1区
文献类型:
--
作者:
Pakala, S. B.;Singh, K.;Reddy, S. D. N.;Ohshiro, K.;Li, D-Q;Mishra, L.;Kumar, R.

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尽管有大量的转化生长因子β-1(Transform Growth For-β-1,TGF1)调控的基因,但其在转化过程中所起作用的靶点的性质仍然知之甚少。在这里,我们发现转化生长因子-β-1刺激上皮细胞中转移相关蛋白1的转录,转移相关蛋白1是一个双重的主辅助调节因子,并且转移相关蛋白1的状态是转化生长因子-β-1诱导的上皮向间充质转化表型的决定因素。此外,我们还发现MTA1/POLII/AP1共激活子复合体与FosB-基因染色质相互作用并刺激其转录,而FosB又利用FosB/HDAC2复合体抑制转化生长因子-β-1刺激的乳腺上皮细胞E-钙粘素的表达。这些结果提示,转化生长因子-β1通过刺激mTA1的表达,进而诱导FosB抑制E-钙粘素的表达,从而调节细胞外基质的组成,从而揭示了mTA1作为转化生长因子-β1信号转导的靶点和效应器的内在功能。
In spite of a large number of transforming growth factor β1 (TGF-β1)-regulated genes, the nature of its targets with roles in transformation continues to be poorly understood. Here we discovered that TGF-β1 stimulates transcription of metastasis associated protein 1 (MTA1), a dual master coregulator, in epithelial cells, and that MTA1 status is a determinant of TGF-β1-induced epithelial-to-mesenchymal transition phenotypes. In addition, we found that MTA1/Pol II/AP1 coactivator complex interacts with the FosB-gene chromatin and stimulates its transcription, and FosB in-turn, utilizes FosB/HDAC2 complex to repress E-cadherin expression in TGF-β1 stimulated mammary epithelial cells. These findings suggest that TGF-β1 regulates the components of EMT via stimulating the expression of MTA1 which in turn, induces FosB to repress E-cadherin expression and thus, revealed an inherent function of MTA1 as a target and effector of TGF-β1 signaling in epithelial cells.
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