The role of DNA polymerase eta in translesion synthesis past platinum-DNA adducts in human fibroblasts

Cancer Research
Ekaterina BassettMarila Cordeiro-Stone

Abstract

Cisplatin, a widely used chemotherapeutic agent, has been implicated in the induction of secondary tumors in cancer patients. This drug is presumed to be mutagenic because of error-prone translesion synthesis of cisplatin adducts in DNA. Oxaliplatin is effective in cisplatin-resistant tumors, but its mutagenicity in humans has not been reported. The polymerases involved in bypass of cisplatin and oxaliplatin adducts in vivo are not known. DNA polymerase eta is the most efficient polymerase for bypassing platinum adducts in vitro. We evaluated the role of polymerase eta in translesion synthesis past platinum adducts by determining cytotoxicity and induced mutation frequencies at the hypoxanthine guanine phosphoribosyltransferase (HPRT) locus in diploid human fibroblasts. Normal human fibroblasts (NHF1) were compared with xeroderma pigmentosum variant (XPV) cells (polymerase eta-null) after treatment with cisplatin. In addition, XPV cells complemented for polymerase eta expression were compared with the isogenic cells carrying the empty expression vector. Cytotoxicity and induced mutagenicity experiments were measured in parallel in UVC-irradiated fibroblasts. We found that equitoxic doses of cisplatin induced mutations in fibrob...Continue Reading

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