title: Comparative mutagenicity of halogenated pyridines in the Salmonella typhimurium/mammalian microsome test.
abstract: The Salmonella/microsome assay with strains TA97, TA98, TA100 and TA102 was used to examine the potential mutagenicity and structure-activity of 16 mono- and di-halogenated pyridines. The chemical reactivity of the halopyridines suggests that nucleophilic displacement of halogens can occur with halogens at positions 2, 4 and 6 being displaced in addition-elimination reactions. 2-Chloropyridine gave a positive result with rat-liver metabolic activation, and 2-fluoropyridine gave equivocal results under these conditions. Mutagenic responses were also obtained with 2-chloromethyl pyridine and 3-chloromethyl pyridine, in both the presence and absence of rat-liver S9. These results suggest that the halogenated pyridines, especially with halogens at the 2-position, and singly on a methyl substituent, have mutagenic activity in the Salmonella assay.
mesh_terms: D000818:Animals; D011725:Pyridines / Q000494:pharmacology*; D051381:Rats; D012486:Salmonella typhimurium / Q000187:drug effects*; D013329:Structure-Activity Relationship
chemical_list: D011725:Pyridines