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• W1991364150 abstract "Glutathione (GSH) conjugation of (+)-anti-benzo[a]pyrene-7,8-diol-9,10-epoxide [(+)-anti-BPDE], the activated metabolite of benzo[a]pyrene, is believed to be an important mechanism in detoxification of this environmental and dietary carcinogen. Here, we demonstrate that the intracellular accumulation of GSH conjugate of (+)-anti-BPDE (BPD-SG) caused a statistically significant increase in (+)-anti-BPDE–induced DNA adduction. The relationship between intracellular accumulation of BPD-SG and (+)-anti-BPDE–induced DNA adduction was studied using a canine kidney epithelial cell line (MDCKII) and its variants overexpressing multidrug resistance transporter (MDR1) or canalicular multispecific organic anion transporter (cMOAT; also known as multidrug resistance protein 2). MDR1 and cMOAT are implicated in ATP-dependent efflux of anticancer drugs or GSH-xenobiotic conjugates, or both. The GST activity toward (+)-anti-BPDE in parental MDCKII cells did not differ from that in subline overexpressing MDR1 (MDCKII-MDR1) or cMOAT (MDCKII-cMOAT). Intracellular accumulation of BPD-SG, after a 5- or 10-min incubation with 1 μM (+)-anti-BPDE, was significantly higher in parental (41- to 67-fold) and MDCK II-MDR1 cells (31- to 43-fold) than in the MDCKII-cMOAT cells. Interestingly, the levels of DNA adducts of (+)-anti-BPDE, after a 30-min incubation with 0.1 or 0.5 μM [3H](+)-anti-BPDE, were significantly higher (about 2.1- and 1.7-fold, respectively) in parental cells than in the MDCKII-cMOAT cells. The results of the present study indicate that in addition to GSH conjugation, the efflux of BPD-SG may be essential for cellular protection against (+)-anti-BPDE–induced DNA damage. © 2002 Wiley-Liss, Inc." @default.
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• W1991364150 date "2002-02-21" @default.
• W1991364150 modified "2023-10-18" @default.
• W1991364150 title "Role of glutathione conjugate efflux in cellular protection against benzo[a]pyrene-7,8-diol-9,10-epoxide-induced DNA damage" @default.
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• W1991364150 doi "https://doi.org/10.1002/mc.10032" @default.
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