title: The appearance of mutagens in urine of rats after the administration of benzidine and some other aromatic amines.
abstract: The mutagenicity of urine from rats treated with benzidine or 5 other arylamines (0.25 mmol/kg; i.p.) was studied using the Ames-assay. It was found that samples of urine collected for 24 h after the administration of the carcinogens, benzidine, 4-aminobiphenyl and 2-aminonaphthalene, showed significantly mutagenic activity, whereas no mutagenicity was observed in urine after treatment with 3,3'-5,5'-tetramethylbenzidine, 2-aminobiphenyl and 1-aminonaphthalene. Mutagenic activities were dependent on the use of either hepatic S-9 Mix or cytosol as the activating enzyme preparation. The addition of beta-glucuronidase enhanced mutagenicity, except for 2-aminonaphthalene. The appearance of mutagens in urine was studied at varying doses of benzidine and at different time-intervals after the administration. The different excretion patterns found after the activation either with S-9 Mix or with cytosolic enzyme(s) suggest the presence in urine of different types of mutagenic products.
mesh_terms: D000588:Amines / Q000378:metabolism*; D000818:Animals; D001560:Benzidines / Q000378:metabolism*; D003600:Cytosol / Q000378:metabolism; D008099:Liver / Q000378:metabolism; D008297:Male; D009152:Mutagenicity Tests; D009153:Mutagens / Q000652:urine*; D009249:NADP / Q000378:metabolism; D051381:Rats; D013997:Time Factors
chemical_list: D000588:Amines; D001560:Benzidines; D009153:Mutagens; D009249:NADP