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• W2149380080 abstract "Non-dioxin-like (NDL) polychlorinated biphenyls (PCBs) and their hydroxyl metabolites (OH-PCBs) are ubiquitous environmental contaminants in human tissues and blood. The toxicological impact of these metabolites is poorly understood. In this study rats were exposed to ultrapure PCB180 (10-1000mg/kgbw) for 28days and induction of genotoxic stress in liver was investigated. DNA damage signaling proteins (pChk1Ser317 and γH2AXSer319) were increased dose dependently in female rats. This increase was paralleled by increasing levels of the metabolite 3'-OH-PCB180. pChk1 was the most sensitive marker. In in vitro studies HepG2 cells were exposed to 1μM of PCB180 and 3'-OH-PCB180 or the positive control benzo[a]pyrene (BaP, 5μM). 3'-OH-PCB180, but not PCB180, induced CYP1A1 mRNA and γH2AX. CYP1A1 mRNA induction was seen at 1h, and γH2AX at 3h. The anti-oxidant N-Acetyl-l-Cysteine (NAC) completely prevented, and 17β-estradiol amplified the γH2AX induction by 3'-OH-PCB180. As 3'-OH-PCB180 induced CYP1A1, a major BaP-metabolizing and activating enzyme, interactions between 3'-OH-PCB180 and BaP was also studied. The metabolite amplified the DNA damage signaling response to BaP. In conclusion, metabolism of PCB180 to its hydroxyl metabolite and the subsequent induction of CYP1A1 seem important for DNA damage induced by PCB180 in vivo. Amplification of the response with estradiol may explain why DNA damage was only seen in female rats." @default.
• W2149380080 created "2016-06-24" @default.
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• W2149380080 date "2015-09-01" @default.
• W2149380080 modified "2023-09-30" @default.
• W2149380080 title "Hydroxyl metabolite of PCB 180 induces DNA damage signaling and enhances the DNA damaging effect of benzo[a]pyrene" @default.
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• W2149380080 doi "https://doi.org/10.1016/j.cbi.2015.07.002" @default.
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