title: Mutagenicity of N-nitrosopyrrolidine derivatives in Salmonella (Ames) and Escherichia coli K-12 (343/113) assays.
abstract: The mutagenicity of nitrosopyrrolidine (NPYR) and its derivatives was determined by use of the Ames Salmonella assay. A clear specificity to revert the missense stain of TA1535 and a requirement for the phenobarbital-induced rat-liver activation system (S9 mix) were noted. 3,4-Dichloronitrosopyrrolidine was more mutagenic than NPYR, whereas 3-hydroxynitrosopyrrolidine was weakly mutagenic. The carcinogenic nitroso-3-pyrrolidine was not mutagenic under the test conditions. The noncarcinogenic derivatives (2,5-dimethylnitrosopyrrolidine, nitrosoproline and 4-hydroxynitrosoproline) were not mutagenic. Liquid preincubation assays were not any more effective than the pour-plate assays. Selected derivatives of NPYR were tested in the Escherichia coli K-12 (343/113) assay A specificity to revert the missense mutation at the arg locus and a dependence on phenobarbital-induced rat-liver S9 mix were noted with NPYR and its derivatives. 3,4-Dibromonitrosopyrrolidine, which was not mutagenic in Salmonella, was effective in E. coli, and the weakly carcinogenic NPRL was a weak mutagen resulting in a 2-fold enhancement in the E. coli arginine reversion assay.
mesh_terms: D000818:Animals; D001711:Biotransformation; D004926:Escherichia coli / Q000235:genetics; D008862:Microsomes, Liver / Q000378:metabolism; D009152:Mutagenicity Tests; D009153:Mutagens; D009242:N-Nitrosopyrrolidine / Q000031:analogs & derivatives / Q000494:pharmacology*; D009602:Nitrosamines / Q000494:pharmacology*; D051381:Rats; D012475:Salmonella / Q000235:genetics; D013329:Structure-Activity Relationship
chemical_list: D009153:Mutagens; D009602:Nitrosamines; D009242:N-Nitrosopyrrolidine