title: Metabolic activation of benzo[a]pyrene, aflatoxin B1, and dimethylnitrosamine by a human hepatoma cell line.
abstract: The metabolism of chemical carcinogens by a human hepatoma cell line, huH-1, was studied. The huH-1 line has been derived from a hepatoma of a 57-year-old HBs-antigen carrier and cultivated for several years. The hepatoma cells metabolized about 90% of 5 microM benzo[a]pyrene into water-soluble products within 24 h. Aryl hydrocarbon hydroxylase activity in huH-1 cells was induced to 24 times higher than the basal level by treatment with 13 microM benz[a]anthracene for 24 h. Metabolic activation of benzo[a]pyrene, dimethylnitrosamine and aflatoxin B1 by huH-1 cells was observed by cell-mediated sister-chromatid exchange assay. Sister-chromatid exchanges in human diploid fibroblasts were observed in the cultures mixed with or without huH-1 cells. All 3 chemicals induced sister-chromatid exchanges in human fibroblasts far more efficiently in the cultures mixed with huH-1 cells than in those without huH-1 cells. Some characteristics of huH-1 cells as a human cell-mediated metabolic activation system for carcinogens are discussed.
mesh_terms: D016604:Aflatoxin B1; D000348:Aflatoxins / Q000378:metabolism*; D001189:Aryl Hydrocarbon Hydroxylases / Q000378:metabolism; D001564:Benzo(a)pyrene; D001580:Benzopyrenes / Q000378:metabolism*; D001711:Biotransformation; D002273:Carcinogens / Q000378:metabolism* / Q000494:pharmacology; D006528:Carcinoma, Hepatocellular / Q000378:metabolism*; D002460:Cell Line; D004128:Dimethylnitrosamine / Q000378:metabolism*; D006801:Humans; D008113:Liver Neoplasms / Q000378:metabolism*; D008875:Middle Aged; D012854:Sister Chromatid Exchange / Q000187:drug effects
chemical_list: D000348:Aflatoxins; D001580:Benzopyrenes; D002273:Carcinogens; D001564:Benzo(a)pyrene; D016604:Aflatoxin B1; D001189:Aryl Hydrocarbon Hydroxylases; D004128:Dimethylnitrosamine