title: Activation of polycyclic hydrocarbons in Reuber H4-II-E hepatoma cells. An in vitro system for the induction of SCEs.
abstract: Activation of polycyclic aromatic hydrocarbons (PAHs) was examined in the Reuber H4-II-E established cell line without the use of exogenous enzyme preparations. Metabolism of PAHs to genotoxic products was determined by the induction of sister-chromatid exchanges (SCEs). The induction of SCEs followed a dose-response pattern with plateaus at high doses of PAH. The effects of metabolic enzyme inducers (3-methylcholanthrene, phenobarbital, Aroclor 1254) and the epoxide hydrase inhibitor 1,1,1-trichloropropylene oxide were assessed as changes in SCE induction and enhanced production of water-soluble metabolites. Results indicate that Reuber H4-II-E cells can be employed in the testing of carcinogens activated by the P1-450 monooxygenase system and would be a useful in vitro system for the study of mechanisms of metabolic induction and their effect on genetic toxicity.
mesh_terms: D015127:9,10-Dimethyl-1,2-benzanthracene / Q000633:toxicity; D000818:Animals; D001564:Benzo(a)pyrene; D001580:Benzopyrenes / Q000633:toxicity; D003434:Crossing Over, Genetic / Q000187:drug effects*; D066298:In Vitro Techniques; D007700:Kinetics; D008114:Liver Neoplasms, Experimental / Q000503:physiopathology*; D008748:Methylcholanthrene / Q000633:toxicity; D009153:Mutagens / Q000633:toxicity; D011083:Polycyclic Compounds / Q000633:toxicity*; D012854:Sister Chromatid Exchange / Q000187:drug effects*; D013329:Structure-Activity Relationship
chemical_list: D001580:Benzopyrenes; D009153:Mutagens; D011083:Polycyclic Compounds; D001564:Benzo(a)pyrene; D008748:Methylcholanthrene; D015127:9,10-Dimethyl-1,2-benzanthracene