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• W2040254448 endingPage "324" @default.
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• W2040254448 abstract "We previously identified FOXF1 as a potential tumor suppressor gene with an essential role in preventing DNA rereplication to maintain genomic stability, which is frequently inactivated in breast cancer through the epigenetic mechanism. Here we further addressed the role of the p53–p21WAF1 checkpoint pathway in DNA rereplication induced by silencing of FOXF1. Knockdown of FOXF1 by small interference RNA (siRNA) rendered colorectal p53-null and p21WAF1-null HCT116 cancer cells more susceptible to rereplication and apoptosis than the wild-type parental cells. In parental HCT116 cells with a functional p53 checkpoint, the p53–p21WAF1 checkpoint pathway was activated upon FOXF1 knockdown, which was concurrent with suppression of the CDK2-Rb cascade and induction of G1 arrest. In contrast, these events were not observed in FOXF1-depleted HCT116-p53−/− and HCT116-p21−/− cells, indicating that the p53-dependent checkpoint function is vital for inhibiting CDK2 to induce G1 arrest and protect cells from rereplication. The pharmacologic inhibitor (caffeine) of ataxia telangiectasia mutated (ATM) and ataxia telangiectasia and Rad3 related (ATR) protein kinases abolished activation of the p53–p21WAF1 pathway upon FOXF1 knockdown, suggesting that suppression of FOXF1 function triggered the ATM/ATR-mediated DNA damage response. Cosilencing of p53 by siRNA synergistically enhanced the effect of FOXF1 depletion on the stimulation of DNA rereplication and apoptosis in wild-type HCT116. Finally, we show that FOXF1 expression is predominantly silenced in breast and colorectal cancer cell lines with inactive p53. Our study demonstrated that the p53–p21WAF1 checkpoint pathway is an intrinsically protective mechanism to prevent DNA rereplication induced by silencing of FOXF1." @default.
• W2040254448 created "2016-06-24" @default.
• W2040254448 creator A5061830369 @default.
• W2040254448 creator A5079522224 @default.
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• W2040254448 date "2012-01-01" @default.
• W2040254448 modified "2023-10-18" @default.
• W2040254448 title "The p53–p21WAF1 checkpoint pathway plays a protective role in preventing DNA rereplication induced by abrogation of FOXF1 function" @default.
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• W2040254448 doi "https://doi.org/10.1016/j.cellsig.2011.09.017" @default.
• W2040254448 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3205208" @default.
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