title: Mutagenicity of CL 64855, a potent anti-Trypanosoma cruzi drug.
abstract: The nitroimidazole-thiadiazole derivative CL 64855 (2-amino-5 (1-methyl-5-nitro-2-imidazolyl)-1,3,4-thiadiazole), a potent antimicrobial agent with curative action against Trypanosoma cruzi, was assayed in the Salmonella/microsome test. CL 64855 proved to be a potent mutagen to the frameshift indicator tester strains TA98 and TA102. No activity was observed with the base-pair substitution mutagen indicator strain TA100 in spot tests. No significant increase in the number of induced mutants could be detected in the presence of rat-liver microsome fraction. The excision-repair-deficient strain TA98 was much more sensitive to the killing action of CL 64855 than TA102, a repair-proficient strain. Possible differences among the mutagenic effects of CL 64855 and those observed with other anti-trypanosomal drugs are discussed.
mesh_terms: D000818:Animals; D001711:Biotransformation; D008862:Microsomes, Liver / Q000378:metabolism; D009152:Mutagenicity Tests; D009154:Mutation / Q000187:drug effects*; D051381:Rats; D012486:Salmonella typhimurium / Q000187:drug effects / Q000235:genetics; D013830:Thiadiazoles / Q000633:toxicity*; D014344:Trypanocidal Agents / Q000633:toxicity*
chemical_list: D013830:Thiadiazoles; D014344:Trypanocidal Agents; C013378:megazol