TSC1/TSC2 inactivation inhibits AKT through mTORC1-dependent up-regulation of STAT3-PTEN cascade.

TSC1/TSC2 inactivation inhibits AKT through mTORC1-dependent up-regulation of STAT3-PTEN cascade.
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TSC1/TSC2 失活通过 mTORC1 依赖性上调 STAT3-PTEN 级联抑制 AKT。

DOI:
10.1016/j.canlet.2011.09.006
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发表时间:
2011-12
期刊:
影响因子:
9.7
通讯作者:
张宏冰
张宏冰
中科院分区:
医学1区
文献类型:
--
作者:
査晓军;张宏冰

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哺乳动物雷帕霉素靶蛋白复合物1 (mTORC1)的异常激活是由TSC1/TSC2蛋白复合物的丢失或失活引起的,从而导致Akt的负反馈抑制。这一过程的确切机制尚不完全清楚。在这里,我们提出了STAT3参与这一过程的证据,STAT3是一种已知的mTORC1调节的转录因子。我们证明STAT3通过直接结合PTEN启动子来促进PTEN的转录。升高的PTEN通过下调Akt信号传导抑制Tsc1 - / -或Tsc2 - / -细胞的增殖。因此,PTEN在该通路中的激活可能作为一种保护机制,防止mTORC1过度激活介导的肿瘤发生,并有助于TSC1或TSC2缺失引起的肿瘤的良性性质。
Aberrant activation of mammalian target of rapamycin complex 1 (mTORC1), caused by loss or inactivation of TSC1/TSC2 protein complex, leads to negative feedback inhibition of Akt. The exact mechanisms of this process are still not fully understood. Here we present evidence for the involvement of STAT3, a known mTORC1 regulated transcription factor, in this process. We demonstrate that STAT3 promotes the transcription of PTEN by directly binding on the PTEN promoter. Elevated PTEN then inhibits the proliferation of Tsc1−/−or Tsc2−/−cells through down-regulation of Akt signaling. Activation of PTEN in this pathway may thus serve as a protective mechanism against hyper-activated mTORC1 mediated tumorigenesis and contribute to the benign nature of tumors caused by loss of either TSC1 or TSC2.
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