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- W1486163284 abstract "The mutagenicity of 3'-methyl-N, N-dimethyl-4-aminoazobenzene (3'-Me-DAB) and 3'-CH2OH-DAB, potent hepatocarcinogens, was examined. Microsomal and cytosolic fractions from rat, mouse, hamster, rabbit, and human livers were used for metabolic activation, with Salmonella typhimurium TA100 or TA98 as a tester strain. The mutagenicity of both aminoazo dyes mediated by liver microsomes from polychlorinated biphenyls (PCB)-induced rats was markedly enhanced by addition of the hepatic cytosol ; it was also enhanced by addition of the hepatic cytosol from uninduced rats and phenobarbital-or 3-methylcholanthrene (3-MC)-induced rats. Similar mutagenesis enhancement was produced by cytosols from PCB-induced mice, hamsters, or female rats. The cytosols from rabbit and human liver enhanced the mutagenicity of 3'-CH2OH-DAB but not that of 3'-Me-DAB. Heating of the cytosol from uninduced rat liver to 55°C for 15 min caused a loss of most of the enhancement activity ; at 40°C, it was stable. About 30% of the enhancement activity for both aminoazo dyes was lost upon dialysis for 24h at 4°C. Protein fractions with the aminoazo dye mutagenicity-enhancing activity were obtained from the dialyzed cytosol by gel filtration through Sephadex G-100 ; the protein fraction with the greatest activity, representing an approximately 3-fold increase in specific activity, was assigned a molecular weight of 43000-47500. This protein preparation enhanced microsome-mediated mutagenesis by 3'-hydroxymethyl-N-methyl-4-aminoazobenzene and o-aminoazotoluene but not that by 3-MC, benzo [a] pyrene, or dimethylnitrosamine." @default.
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- W1486163284 date "1984-01-01" @default.
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- W1486163284 title "Influence of microsomal and cytosolic fractions from the liver of 4 animal species and man on the mutagenicity of carcinogenic aminoazo dyes and nature of the mutagenicity-enhancing factor in the cytosol from rat liver." @default.
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- W1486163284 doi "https://doi.org/10.1248/cpb.32.3641" @default.
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