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• W2974708268 endingPage "111678" @default.
• W2974708268 startingPage "111678" @default.
• W2974708268 abstract "The ATR protein kinase is known to protect cells from DNA damage induced during the replicative phase of the cell cycle. Small molecule ATR kinase inhibitors have therefore been developed to improve the effectiveness of DNA damage-based chemotherapy regimens aimed at killing rapidly proliferating tumor cells. However, whether ATR functions in a similar manner in non-replicating cells has not been examined and is important considering the fact that most cells in the body, including cancer stem cells in solid tumors, normally reside in either a quiescent or differentiated non-replicating state. Using cultured human cell lines maintained in a quiescent or slowly growing state in vitro, ATR was found to be activated following treatment with the common anti-cancer drug cisplatin in a manner dependent on the nucleotide excision repair (NER) system. Moreover, treatment with the ATR kinase inhibitors VE-821 and AZD6738 enhanced quiescent cell killing and apoptotic signaling induced by cisplatin. However, ATR kinase inhibition in quiescent cells treated with a low concentration of cisplatin also elevated the level of mutagenesis at the hypoxanthine phosphoribosyltransferase locus and resulted in increased levels of PCNA mono-ubiquitination. These results suggest that the excision gaps generated by NER may require a greater utilization of potentially mutagenic translesion synthesis polymerases in the absence of ATR kinase function. Thus, though ATR kinase inhibitors can aid in the killing of cisplatin-treated quiescent cells, such treatments may also result in a greater reliance on alternative mutagenic DNA polymerases to complete the repair of cisplatin-DNA adducts." @default.
• W2974708268 created "2019-09-26" @default.
• W2974708268 creator A5031228223 @default.
• W2974708268 creator A5055584032 @default.
• W2974708268 date "2019-11-01" @default.
• W2974708268 modified "2023-09-28" @default.
• W2974708268 title "ATR kinase inhibition sensitizes quiescent human cells to the lethal effects of cisplatin but increases mutagenesis" @default.
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• W2974708268 doi "https://doi.org/10.1016/j.mrfmmm.2019.111678" @default.
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