title: Quantitative analysis of cytotoxicity and mutagenicity of benzo[a]pyrene in mammalian cells (CHO/HGPRT system).
abstract: Chinese hamster ovary (CHO) cells in cell culture were utilized to study the cytotoxic and mutagenic activity of benzo[a]pyrene (BP). A liver homogenate (S9) prepared from Arochlor 1254 induced male Sprague-Dawley rats was employed to mediate the biotransformation of the promutagen. The dependence of the induction of 6-thioguanine(TG)-resistant mutants on parameters such as BP concentration, amount of S9 protein, ionic composition of the S9 mix and treatment time was determined. Under optimal conditions with a 5-h treatment time, BP mutagenicity can be described as 185 mutants/10(6) cells per microM BP per mg/ml S9 protein.
mesh_terms: D000818:Animals; D001580:Benzopyrenes / Q000633:toxicity*; D001711:Biotransformation; D002460:Cell Line; D002470:Cell Survival / Q000187:drug effects*; D006224:Cricetinae; D003412:Cricetulus; D005260:Female; D008110:Liver Extracts / Q000378:metabolism; D008297:Male; D009153:Mutagens; D010053:Ovary; D011506:Proteins / Q000378:metabolism; D051381:Rats; D013997:Time Factors
chemical_list: D001580:Benzopyrenes; D008110:Liver Extracts; D009153:Mutagens; D011506:Proteins