E2F1 represses beta-catenin transcription and is antagonized by both pRB and CDK8.

E2F1 represses beta-catenin transcription and is antagonized by both pRB and CDK8.
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DOI:
10.1038/nature07310
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发表时间:
2008-09-25
期刊:
影响因子:
64.8
通讯作者:
Dyson, Nicholas J.
Dyson, Nicholas J.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Morris, Erick J.;Ji, Jun-Yuan;Yang, Fajun;Di Stefano, Luisa;Herr, Anabel;Moon, Nam-Sung;Kwon, Eun-Jeong;Haigis, Kevin M.;Naar, Anders M.;Dyson, Nicholas J.

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The E2F1 transcription factor can promote proliferation or apoptosis when activated, and is a key downstream target of the retinoblastoma tumor suppressor protein (pRB). Here we show that E2F1 is a potent and specific inhibitor of β-catenin/T-cell factor (TCF)-dependent transcription, and that this function contributes to E2F1-induced apoptosis. E2F1 deregulation suppresses β- catenin activity in an adenomatous polyposis coli (APC)/glycogen synthase kinase-3 (GSK3)-independent manner, reducing the expression of key β-catenin targets including c-MYC. This interaction explains why colorectal tumors, which depend on β-catenin transcription for their abnormal proliferation, keep RB1 intact. Remarkably, E2F1 activity is also repressed by cyclin-dependent kinase-8 (CDK8), a colorectal oncoprotein. Elevated levels of CDK8 protect β-catenin/TCF-dependent transcription from inhibition by E2F1. Thus, by retaining RB1 and amplifying CDK8, colorectal tumor cells select conditions that collectively suppress E2F1 and enhance the activity of β-catenin.
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