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• W2025983590 endingPage "343" @default.
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• W2025983590 abstract "S23906 belongs to a novel class of alkylating anticancer agents forming bulky monofunctional DNA adducts. A unique feature of S23906 is its “helicase-like” activity leading to the destabilization of the surrounding duplex DNA. We here characterize the recognition and repair of S23906 adducts by the nucleotide excision repair (NER) machinery. All NER-deficient human cell lines tested showed increased sensitivity to S23906, which was particularly pronounced for cells deficient in XPC, CSB and XPA. In comparison, deficiencies in ERCC1 or XPF had lesser impact on the sensitivity to S23906. The sensitivity was, at least in part, linked to the conversion of unrepaired adducts into toxic DNA strand breaks as shown by single cell electrophoresis and gamma-H2AX formation. The pharmacological relevance of these findings was confirmed by the characterization of KB carcinoma cells with acquired S23906 resistance. These cells showed increased NER activity in vivo as well as toward damaged plasmid DNA in vitro. In particular, both global genome NER, as shown by unscheduled DNA synthesis, and transcription-coupled NER, as shown by transcriptional recovery, were up-regulated in the S23906-resistant cells. The increased NER activity was accompanied by up to 5-fold up-regulation of XPC, CSB and XPA proteins without detectable alterations of ERCC1 on the DNA, RNA or protein levels. Our results suggest that S23906 adducts are recognized and repaired by both NER sub-pathways in contrast to other members of this class, that are only recognized by transcription-coupled NER. We further show that NER activity can be up-regulated without changes in ERCC1 expression." @default.
• W2025983590 created "2016-06-24" @default.
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• W2025983590 date "2010-08-01" @default.
• W2025983590 modified "2023-09-25" @default.
• W2025983590 title "The NER proteins XPC and CSB, but not ERCC1, regulate the sensitivity to the novel DNA binder S23906: Implications for recognition and repair of antitumor alkylators" @default.
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• W2025983590 doi "https://doi.org/10.1016/j.bcp.2010.04.012" @default.
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