Akt-mediated regulation of autophagy and tumorigenesis through Beclin 1 phosphorylation.
Akt-mediated regulation of autophagy and tumorigenesis through Beclin 1 phosphorylation.
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DOI:
10.1126/science.1225967
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发表时间:
2012-11-16
期刊:
影响因子:
--
通讯作者:
Levine B
中科院分区:
文献类型:
--
作者:
Wang RC;Wei Y;An Z;Zou Z;Xiao G;Bhagat G;White M;Reichelt J;Levine B
Aberrant signaling through the class I phosphatidylinositol 3-kinase (PI3K)-Akt axis is frequent in human cancer. Here we show that Beclin 1, an essential autophagy and tumor suppressor protein, is a target of the protein kinase Akt. Expression of a Beclin 1 mutant resistant to Akt-mediated phosphorylation increased autophagy, reduced anchorage-independent growth, and inhibited Akt-driven tumorigenesis. Akt-mediated phosphorylation of Beclin 1 enhanced its interactions with 14-3-3 and vimentin intermediate filament proteins, and vimentin depletion increased autophagy and inhibited Akt-driven transformation. Thus, Akt-mediated phosphorylation of Beclin 1 functions in autophagy inhibition, oncogenesis, and the formation of an autophagy-inhibitory Beclin 1/14-3-3/vimentin intermediate filament complex. These findings have broad implications for understanding the role of Akt signaling and intermediate filament proteins in autophagy and cancer.
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