TGF-beta receptor levels regulate the specificity of signaling pathway activation and biological effects of TGF-beta.

TGF-beta receptor levels regulate the specificity of signaling pathway activation and biological effects of TGF-beta.
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TGF-β受体水平调节信号通路激活的特异性和TGF-β的生物学效应。

DOI:
10.1016/j.bbamcr.2009.02.001
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发表时间:
2009-07
影响因子:
5.1
通讯作者:
Grady, William M.
Grady, William M.
中科院分区:
生物学2区
文献类型:
--
作者:
Rojas, Andres;Padidam, Malla;Cress, Dean;Grady, William M.

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TGF-β是一种多能细胞因子,其通过由TGF-β受体II型(TGFBR 2)和I型(TGFBR 1)组成的受体介导其作用。TGF-β受体可以调节Smad和nonSmad信号通路,从而最终决定TGF-β的生物学效应。我们推测,控制TGF-β R 2的水平是调节TGF-β信号通路激活的特异性和TGF-β生物学效应的机制。我们使用了一个可精确调控的TGFBR 2表达系统来评估TGFBR 2表达水平对信号传导和TGF-β介导的凋亡的影响。我们发现Smad信号和MAPK-ERK信号的激活水平与TGFBR 2表达水平直接相关。此外,p21水平和TGF-β诱导的细胞凋亡似乎取决于相对高的TGFBR 2表达和MAPK-ERK和SMAD途径的激活。因此,TGFBR 2表达的控制和TGF-β信号传导途径的差异活化似乎是调节TGF-β生物学效应特异性的机制。
TGF-β is a pluripotent cytokine that mediates its effects through a receptor composed of TGF-β receptor type II (TGFBR2) and type I (TGFBR1). The TGF-β receptor can regulate Smad and nonSmad signaling pathways, which then ultimately dictate TGF-β's biological effects. We postulated that control of the level of TGFBR2 is a mechanism for regulating the specificity of TGF-β signaling pathway activation and TGF-β's biological effects. We used a precisely regulatable TGFBR2 expression system to assess the effects of TGFBR2 expression levels on signaling and TGF-β mediated apoptosis. We found Smad signaling and MAPK-ERK signaling activation levels correlate directly with TGFBR2 expression levels. Furthermore, p21 levels and TGF-β induced apoptosis appear to depend on relatively high TGFBR2 expression and on the activation of the MAPK-ERK and SMAD pathways. Thus, control of TGFBR2 expression and the differential activation of TGF-β signaling pathways appears to be a mechanism for regulating the specificity of the biological effects of TGF-β.
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