title: Spontaneous and induced chromosomal aberrations and gene mutations in human lymphoblasts: mitomycin C, methylnitrosourea, and ethylnitrosourea.
abstract: The concentration-dependent mutagenic, clastogenic, and cytocidal activities of mitomycin C (MC), methylnitrosourea (MNU), and ethylnitrosourea (ENU) were measured in the human lymphoblast cell line TK6. For treatments resulting in fewer than 2 lethal hits, MNU, ENU, and MC gave rise to apparently linear dose-response curves for gene mutations (hgprt and tk genes) as well as for chromosomal aberrations. The numbers of induced mutants at the tk and hgprt loci were similar between the two loci for each compound. However, the ratio of mutagenic activity relative to the clastogenic activity (aberrations/cell) was lowest for mitomycin C, intermediate for methylnitrosourea, and highest for ethylnitrosourea. These results confirm in human cells the general observation that the processes of mutagenesis and clastogenesis are nonidentical: compounds vary independently in their mutagenic and clastogenic potentials.
authors.forename: J C
authors.initials: JC
authors.lastname: Jensen
authors.forename: W G
authors.initials: WG
authors.lastname: Thilly
mesh_terms: D002460:Cell Line; D002470:Cell Survival / Q000187:drug effects; D002869:Chromosome Aberrations / Q000187:drug effects*; D004305:Dose-Response Relationship, Drug; D005038:Ethylnitrosourea / Q000633:toxicity*; D006801:Humans; D007041:Hypoxanthine Phosphoribosyltransferase / Q000235:genetics; D008214:Lymphocytes / Q000528:radiation effects / Q000648:ultrastructure; D008770:Methylnitrosourea / Q000633:toxicity*; D016685:Mitomycin; D008937:Mitomycins / Q000633:toxicity*; D009154:Mutation; D013937:Thymidine Kinase / Q000235:genetics
chemical_list: D008937:Mitomycins; D016685:Mitomycin; D008770:Methylnitrosourea; D007041:Hypoxanthine Phosphoribosyltransferase; D013937:Thymidine Kinase; D005038:Ethylnitrosourea