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• W2017231837 abstract "Cyclin E overexpression is observed in multiple human tumors and linked to poor prognosis. We have previously shown that ectopic expression of cyclin E is sufficient to induce mitogen-independent cell cycle entry in a variety of tumor/immortal cell lines. Here we have investigated the rate-limiting step leading to cell cycle entry in quiescent normal human fibroblasts (NHF) ectopically expressing cyclin E. We found that in serum-starved NHF, cyclin E forms inactive complexes with CDK2 and fails to induce DNA synthesis. Coexpression of SV40 small t antigen (st), but not other tested oncogenes, efficiently induces mitogen-independent CDK2 phosphorylation on Thr-160, CDK2 activation, and DNA synthesis. Additionally, in contact-inhibited NHF ectopically expressing cyclin E, st induces cell cycle entry, continued proliferation, and foci formation. Coexpression of cyclin E and st also bypasses G(0)/G(1) arrests induced by CDK inhibitors. Although CDK2 is dispensable for G(0)/G(1) cell cycle entry and normal proliferation in mammals, CDK2 activity is an essential rate-limiting step in NHF with deregulated cyclin E expression and altered PP2A activity, which endows primary cells with transformed features. Consequently, CDK2 could be targeted therapeutically in tumors that involve these alterations. These data also suggest that alterations prior to cyclin E deregulation facilitate proliferation of tumor cells by bypassing mitogenic requirements and negative regulation by adjacent cells." @default.
• W2017231837 created "2016-06-24" @default.
• W2017231837 creator A5021358344 @default.
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• W2017231837 date "2008-04-01" @default.
• W2017231837 modified "2023-10-04" @default.
• W2017231837 title "Cyclin E and SV40 Small t Antigen Cooperate to Bypass Quiescence and Contribute to Transformation by Activating CDK2 in Human Fibroblasts*" @default.
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• W2017231837 doi "https://doi.org/10.1074/jbc.m709055200" @default.
• W2017231837 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2431056" @default.
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