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• W2112264653 endingPage "393" @default.
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• W2112264653 abstract "cis -Diamminedichloroplatinum(II) (cisplatin) forms DNA adducts that interfere with replication and transcription. The most common adducts formed in vivo are 1,2-intrastrand d(GpG) cross-links (Pt-GG) and d(ApG) cross-links (Pt-AG), with minor amounts of 1,3-d(GpNpG) cross-links (Pt-GNG), interstrand cross-links and monoadducts. Although the relative contribution of these different adducts to toxicity is not known, literature implicates that Pt-GG and Pt-AG adducts block replication. Thus, nucleotide excision repair (NER), by which platinum adducts are excised, and translesion DNA synthesis (TLS), which permits adduct bypass, are thought to be associated with cisplatin resistance. Recent studies have reported that the clinical benefit from platinum-based chemotherapy is high if tumor cells express low levels of NER factors. To investigate the role of platinum–DNA adducts in mediating tumor cell survival by TLS, we examined whether 1,3-intrastrand d(GpTpG) platinum cross-links (Pt-GTG), which probably exist in NER-negative tumor cells but not in NER-positive tumor cells, are bypassed by the translesion DNA polymerase η (pol η), which is known to bypass Pt-GG. We show that pol η can incorporate the correct deoxycytidine triphosphate opposite the first 3′-cross-linked G of Pt-GTG but cannot insert any nucleotides opposite the second intact T or the third 5′-cross-linked G of the adducts, thereby suggesting that TLS does not facilitate replication past Pt-GTG adducts. Thus, our findings implicate Pt-GNG adducts as mediating the cytotoxicity of platinum–DNA adducts in NER-negative tumors in vivo ." @default.
• W2112264653 created "2016-06-24" @default.
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• W2112264653 date "2009-12-16" @default.
• W2112264653 modified "2023-10-13" @default.
• W2112264653 title "Polymerization by DNA polymerase is blocked by cis-diamminedichloroplatinum(II) 1,3-d(GpTpG) cross-link: implications for cytotoxic effects in nucleotide excision repair-negative tumor cells" @default.
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• W2112264653 doi "https://doi.org/10.1093/carcin/bgp316" @default.
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