E2F1 regulates cellular growth by mTORC1 signaling.

E2F1 regulates cellular growth by mTORC1 signaling.
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DOI:
10.1371/journal.pone.0016163
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发表时间:
2011-01-24
期刊:
影响因子:
3.7
通讯作者:
Tauler A
Tauler A
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Real S;Meo-Evoli N;Espada L;Tauler A

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在细胞增殖期间,必须发生生长以维持稳态细胞大小。在这里,我们表明,E2F1能够通过调节mTORC 1活性诱导生长。E2F1对细胞生长和mTORC 1的激活依赖于E2F1结合DNA和调节基因转录的能力,这表明在该过程中需要基因诱导表达程序。与E2F1不同,E2F3不能激活mTORC 1,这表明生长活性可能仅限于单个E2F成员。E2F1对mTORC1激活的影响不依赖于Akt。此外,TSC2的过表达不干扰E2F1的作用,表明E2F1诱导的信号通路可以补偿TSC2对Rheb的抑制作用。免疫定位研究表明,E2F1诱导的mTORC 1易位到晚期内体囊泡,在一个机制依赖于亮氨酸。E2F1和亮氨酸或胰岛素一起影响S6K的激活比单独更强,表明它们在激活信号通路中是互补的。从这些研究中,E2F1成为整合细胞分裂和生长的关键蛋白,这两者对细胞增殖至关重要。
During cell proliferation, growth must occur to maintain homeostatic cell size. Here we show that E2F1 is capable of inducing growth by regulating mTORC1 activity. The activation of cell growth and mTORC1 by E2F1 is dependent on both E2F1's ability to bind DNA and to regulate gene transcription, demonstrating that a gene induction expression program is required in this process. Unlike E2F1, E2F3 is unable to activate mTORC1, suggesting that growth activity could be restricted to individual E2F members. The effect of E2F1 on the activation of mTORC1 does not depend on Akt. Furthermore, over-expression of TSC2 does not interfere with the effect of E2F1, indicating that the E2F1-induced signal pathway can compensate for the inhibitory effect of TSC2 on Rheb. Immunolocalization studies demonstrate that E2F1 induces the translocation of mTORC1 to the late endosome vesicles, in a mechanism dependent of leucine. E2F1 and leucine, or insulin, together affect the activation of S6K stronger than alone suggesting that they are complementary in activating the signal pathway. From these studies, E2F1 emerges as a key protein that integrates cell division and growth, both of which are essential for cell proliferation.
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