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• W2907613025 endingPage "954" @default.
• W2907613025 startingPage "945" @default.
• W2907613025 abstract "Polychlorinated biphenyls (PCBs) are persistent organic pollutants and hazardous to human health. Aflatoxin B1 (AFB1) is a strong carcinogen dependent on activation by cytochrome P450 (CYP) 1A2 and 3A4. Humans in some regions may be exposed to both PCBs and AFB1. Since PCBs are CYP inducers, we were interested in their combined genotoxicity. In this study, the effects of non-coplanar 2,3,3'-tri- (PCB 20), 2,2'5,5'-tetra- (PCB 52), 2,3,3',4'-tetrachlorobiphenyl (PCB 56), and coplanar 3,3',4,4',5-pentachlorobiphenyl (PCB 126) on protein levels of CYP1A1, 1A2, and 3A4, and nuclear receptors AhR, CAR and PXR in a human hepatocyte (L-02) line were investigated. Moreover, the combined effects of each PCB and AFB1 for induction of micronuclei and double-strand DNA breaks (indicated by an elevation of γ-H2AX) were analyzed. The results indicated that PCBs 20, 52 and 56 reduced the expression of AhR, while elevated that of CAR and PXR, with thresholds at low micromolar concentrations. However, they were less potent than PCB 126, which was active at sub-nanomolar levels. Overexpression of human splice variant CAR 3 in the cells increased CYP1A2 and 3A4 levels, which were further enhanced by each non-coplanar PCB, suggesting a role of CAR in modulating CYPs. Pretreatment of cells with each test PCB potentiated both micronuclei formation and DNA damage induced by AFB1. This study suggests that both non-coplanar and coplanar PCBs may enhance the genotoxicity of AFB1, through acting on various nuclear receptors; the potentiation of AFB1 genotoxicity by PCBs and the potential health implications may deserve concerns and further investigation." @default.
• W2907613025 created "2019-01-11" @default.
• W2907613025 creator A5030197645 @default.
• W2907613025 creator A5064075699 @default.
• W2907613025 date "2019-03-01" @default.
• W2907613025 modified "2023-09-24" @default.
• W2907613025 title "Non-coplanar and coplanar polychlorinated biphenyls potentiate genotoxicity of aflatoxin B1 in a human hepatocyte line by enhancing CYP1A2 and CYP3A4 expression" @default.
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• W2907613025 doi "https://doi.org/10.1016/j.envpol.2018.12.041" @default.
• W2907613025 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/31159144" @default.
• W2907613025 hasPublicationYear "2019" @default.
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