title: Comparison of repair of O6-methylguanine produced by N-methyl-N'-nitro-N-nitrosoguanidine in mouse and human cells.
abstract: The repair of N-methyl-N'-nitro-N-nitrosoguanidine (MNNG)-produced O6-methylguanine (O6-MeG) in DNA and its correlation with MNNG-produced cell-killing and sister chromatid exchange (SCE) induction were compared in mouse and reference human tumor cell strains. As a result, mouse cell strains were divided into three groups: (i) cells proficient in O6-MeG-repair and insensitive to MNNG similar to human Mer+ Rem+ strains; (ii) cells deficient in O6-MeG-removal and sensitive to MNNG similar to human Mer-Rem- strains; (iii) cells deficient in O6-MeG-removal but insensitive to MNNG similar to some SV40-transformed human strains. Attempts at correlating lack of capacity for O6-MeG-removal, MNNG-sensitivity and high SCE induction showed that O6-MeG in DNA may be a lesion common to cell-killing and SCE induction only in mouse cells of groups i and ii. Levels of O6-MeG-DNA methyltransferase activity in mouse cells were measured and the enzyme had the same molecular weight as that in human cells.
mesh_terms: D000818:Animals; D002460:Cell Line; D002470:Cell Survival / Q000187:drug effects; D002478:Cells, Cultured; D004260:DNA Repair; D004622:Embryo, Mammalian; D005260:Female; D006147:Guanine / Q000031:analogs & derivatives* / Q000032:analysis; D006801:Humans; D007700:Kinetics; D008745:Methylation; D008769:Methylnitronitrosoguanidine / Q000633:toxicity*; D051379:Mice; D008815:Mice, Inbred Strains; D009369:Neoplasms; D009374:Neoplasms, Experimental; D013045:Species Specificity
chemical_list: D008769:Methylnitronitrosoguanidine; D006147:Guanine; C008449:O-(6)-methylguanine