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• W2067402482 abstract "We previously reported that 10-azabenzo[a]pyrene (10-azaBaP), a 10-aza-analog of BaP and an environmental carcinogen, showed greater mutagenicity than BaP in the Ames test using pooled human liver S9. To investigate the cytochrome P450 (CYP) isoform involved in the activation of 10-azaBaP to the genotoxic form, the mutagenicity of 10-azaBaP using nine individual donors' and pooled human liver microsome preparations was compared with each CYP activity. Induced revertants by 2.5 nmol per plate 10-azaBaP with 0.5 mg per plate human liver microsomal protein showed a large inter-individual variation (42-fold) among the nine donors. The number of induced revertants highly correlated with the CYP1A2-selective catalytic activity from each microsome preparation, and no correlation was observed with other CYP isoform-selective catalytic activities. Moreover, recombinant human CYP1A2 contributed to the mutagenicity of 10-azaBaP more markedly than recombinant human CYP1A1. These results suggest that CYP1A2 may be the principal enzyme responsible for the metabolic activation of 10-azaBaP in human liver microsomes. With regard to the proposal that BaP may be activated by human CYP1A1, our results suggest that the nitrogen-substitution at position-10 of BaP may cause the CYP enzyme-specificity in metabolic activation to change from CYP1A1 to CYP1A2." @default.
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• W2067402482 date "2004-02-01" @default.
• W2067402482 modified "2023-09-30" @default.
• W2067402482 title "Metabolic activation of 10-aza-substituted benzo[a]pyrene by cytochrome P450 1A2 in human liver microsomes" @default.
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• W2067402482 doi "https://doi.org/10.1016/j.mrgentox.2003.10.007" @default.
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