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- W2075961667 abstract "The mutagenic potential of 7 carcinogenic N-nitrosopropylamines was examined by the Ames liquid incubation assay, using lung and pancreas 9000 X g supernatant (S9) fractions from rats, hamsters, mice, rabbits, monkeys and humans for metabolic activation. N-Nitroso(2-hydroxypropyl)(2-oxopropyl)amine (HPOP), N-nitrosobis(2-oxopropyl)amine (BOP) and N-nitrosomethyl(2-oxopropyl)amine (MOP) showed positive mutagenicity in strain TA100 in the presence of lung S9 from each of the uninduced animals and humans. Besides the 3 N-nitrosopropylamines, N-nitrosomethyl(2-hydroxypropyl)amine (MHP) was also positive in the presence of lung S9 from polychlorinated biphenyl (PCB)-induced rats, hamsters and mice. On the other hand, in the presence of pancreas S9 from uninduced or PCB-induced animals, only HPOP and BOP showed positive mutagenicity. In contrast, N-nitrosobis(2-hydroxypropyl)amine (BHP), N-nitrosobis(2-acetoxypropyl)amine (BAP) and N-nitroso-2,6-dimethylmorpholine (NDMM) showed negative mutagenicity in the presence of lung and pancreas S9 from either uninduced or PCB-induced animals and humans. HPOP was a direct-acting mutagen, and lung and pancreas S9 from 5 animal species and man did not affect the activity. BOP was mutagenic even in the presence of bovine serum albumin. The mutagenic activation of MHP by lung S9 from PCB-induced rats, hamsters and mice was completely inhibited by preincubation in an atmosphere of carbon monoxide or by addition of cytochrome c or metyrapone to the S9 mixture, whereas 7,8-benzoflavone totally lacked this effect. However, that of MOP was insensitive to these inhibitors. These results of mutagenicity assay indicate that only the methyl derivatives of N-nitrosopropylamines, MHP and MOP are activated by the lung from 5 animal species and man, whereas the pancreas from all the tested animals did not activate the 7 N-nitrosopropylamines to mutagens, and that the phenobarbital-inducible major cytochrome P-450 in the lung of rodents is involved in the mutagenic activation of MHP." @default.
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- W2075961667 title "Activation of carcinogenic N-nitrosopropylamines to mutagens by lung and pancreas S9 fractions from various animal species and man" @default.
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- W2075961667 doi "https://doi.org/10.1016/0027-5107(86)90125-9" @default.
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