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• W2062833467 abstract "We studied five carcinogens for (a) organ-specific mutagenicity and expression time in the transgenic (TG) mouse mutation assay and (b) clastogenicity in the peripheral blood micronucleus assay in the same mice. Groups of mice were injected intraperitoneally (ip) with N-nitroso-di-n-propylamine (NDPA), propylnitrosourea (PNU), 7, 12-dimethylbenz[a]anthracene (DMBA), 4-nitroquinoline-1-oxide (4NQO), or procarbazine (PCZ); 4NQO was also administered orally. LacZ mutant frequencies (MF) of various organs, sampled 7, 14 and 28 days after treatment, were analyzed by galE positive selection. At least 5 organs were analyzed in each experiment. Bone marrow, liver, and testis were always analyzed, as were each chemical's target organs. All chemicals, except NDPA, induced micronuclei. All chemicals increased lacZ MF in all of their target organs for carcinogenesis and, to a lesser extent, in some non-target organs. That suggests that an organ that has a positive response to a chemical in the TG mouse mutation assay is likely to develop tumors on exposure to that chemical, but it does not always happen. The time-course of MF increases (7-28 days) differed among tissues. In general, time-dependent increase in MF occurred in organs with a low cell proliferation rate whereas no increase, or even a decrease, occurred in organs with a high proliferation rate. Our results demonstrated that the TG mouse mutation assay is effective for the detection of chemical mutagenesis in the target organs for carcinogenesis, and organ and time-course variations in chemical mutagenesis are important issues for the establishment of an optimal protocol for the assay." @default.
• W2062833467 created "2016-06-24" @default.
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• W2062833467 date "1999-08-01" @default.
• W2062833467 modified "2023-09-30" @default.
• W2062833467 title "Target organ and time-course in the mutagenicity of five carcinogens in Muta™Mouse: a summary report of the second collaborative study of the transgenic mouse mutation assay by JEMS/MMS" @default.
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• W2062833467 doi "https://doi.org/10.1016/s1383-5718(99)00104-7" @default.
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