PMID: 2108717Jan 9, 1990Paper

Effect of DNA polymerase inhibitors on DNA repair in intact and permeable human fibroblasts: evidence that DNA polymerases delta and beta are involved in DNA repair synthesis induced by N-methyl-N'-nitro-N-nitrosoguanidine

Biochemistry
R A HammondM R Miller

Abstract

The involvement of DNA polymerases alpha, beta, and delta in DNA repair synthesis induced by N-methyl-N'-nitro-N-nitrosoguanidine (MNNG) was investigated in human fibroblasts (HF). The effects of anti-(DNA polymerase alpha) monoclonal antibody, (p-n-butylphenyl)deoxyguanosine triphosphate (BuPdGTP), dideoxythymidine triphosphate (ddTTP), and aphidicolin on MNNG-induced DNA repair synthesis were investigated to dissect the roles of the different DNA polymerases. A subcellular system (permeable cells), in which DNA repair synthesis and DNA replication were differentiated by CsCl gradient centrifugation of BrdUMP density-labeled DNA, was used to examine the effects of the polymerase inhibitors. Another approach investigated the effects of several of these inhibitors on MNNG-induced DNA repair synthesis in intact cells by measuring the amount of [3H]thymidine incorporated into repaired DNA as determined by autoradiography and quantitation with an automated video image analysis system. In permeable cells, MNNG-induced DNA repair synthesis was inhibited 56% by 50 micrograms of aphidicolin/mL, 6% by 10 microM BuPdGTP, 13% by anti-(DNA polymerase alpha) monoclonal antibodies, and 29% by ddTTP. In intact cells, MNNG-induced DNA repair s...Continue Reading

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