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• W1981318368 abstract "Nitropyrenes are ubiquitous environmental pollutants that may pose a human health hazard because some are highly potent mutagens and carcinogens. The mutagenicity (trifluorothymidine resistance at the thymidine kinase locus) of 1-, 2-, and 4-nitropyrene (1-, 2-, and 4-NP), 1,3-, 1,6-, and 1,8-dinitropyrene (1,3-, 1,6-, and 1,8-DNP), and pyrene was assessed in a quantitative forward mutation assay using a metabolically competent line (MCL-5) of human B-lymphoblastoid cells. These cells contain endogenous cytochrome P450 activity (CYP1A1) and two plasmids that express cDNAs for four additional P450s (CYP1A2, CYP2A6, CYP2E1, CYP3A4) and microsomal epoxide hydrolase found in human liver. The major finding is that 2-NP and 1,3-DNP, both potent bacterial mutagens, were nonmutagenic in this assay. The following mutagenic potency series, expressed as the minimum detectable mutagen concentration (MDMC) in nmol/ml, was obtained: 1,6-DNP (0.8), 1,8-DNP (1.5), 4-NP (3.1), 1-NP (9.1), 2-NP (> 81), 1,3-DNP (> 86), pyrene (> 494). There was over an 11-fold difference between the most potent (1.6-DNP) and the least potent (1-NP) mutagen. 1,6-DNP was approximately twice as mutagenic as 1,8-DNP, which was almost twice as mutagenic as 4-NP, which, in turn was nearly three times as potent as 1-NP. This is the first report on the testing of 2-NP and 4-NP for mutagenicity in mammalian cell cultures. The human cell mutagenicity of these compounds was discussed in terms of potency series of nitropyrenes obtained from animal carcinogenicity experiments and other mammalian cell mutagenicity assays." @default.
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• W1981318368 date "1994-10-01" @default.
• W1981318368 modified "2023-10-12" @default.
• W1981318368 title "Human cell mutagenicity of mono- and dinitropyrenes in metabolically competent MCL-5 cells" @default.
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• W1981318368 doi "https://doi.org/10.1016/0165-1218(94)90099-x" @default.
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