title: Mutagenicity of some substituted 1-phenyl-3,3-dimethyltriazenes. I. The salmonella/mammalian microsome assay and repair test.
abstract: The mutagenic activity and related biological properties of Br-, Cl-, NO2- and CH3-derivatives of 1-(phenyl)-3,3-dimethyltriazene were investigated in Salmonella/microsome assays with standard and preincubation metabolic activation and in the repair test using Salmonella and E. coli B/r. In the repair test, the CH3-derivative was slightly positive in the E. coli recA and uvrA repair system, the NO2-derivative had a killing effect on Salmonella typhimurium uvrB-deficient strains. In Salmonella mutagenicity assays, all tested triazene derivatives reverted frameshift tester strains, especially TA1537. The highest number of frameshift mutations was induced by the CH3-derivative in the presence of a standard metabolic activation system; direct mutagenicity of this derivative was weak, reaching about the same level of activity as seen after preincubation. The only test compound that induced mutations of the base-substitution type was the NO2-derivative; this derivative showed the highest mutagenicity when activated by preincubation.
mesh_terms: D000818:Animals; D001711:Biotransformation; D004260:DNA Repair; D004926:Escherichia coli / Q000187:drug effects / Q000235:genetics; D008862:Microsomes, Liver / Q000378:metabolism; D009152:Mutagenicity Tests; D009153:Mutagens / Q000494:pharmacology*; D009154:Mutation; D012486:Salmonella typhimurium / Q000187:drug effects; D013329:Structure-Activity Relationship; D014226:Triazenes / Q000494:pharmacology*
chemical_list: D009153:Mutagens; D014226:Triazenes; C033155:1-(4-tolyl)-3,3-dimethyltriazene; C013879:1-(4-chlorophenyl)-3,3-dimethyltriazene; C051647:1-(4-nitrophenyl)-3,3-dimethyltriazene