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• W2101900231 abstract "Retinyl acetate, 13-cis-retinoic acid (13cisRA), and N-(4-hydroxyphenyl)-retinamide (4HPR) were assayed for their in vivo effects on hepatic levels of cytochrome P450, cytosolic glutathione-S-transferase, and quinone reductase. When given p.o. to Sprague-Dawley rats, all of the retinoids caused significant suppression in the levels of arylhydrocarbon hydroxylase, yet 13cisRA and 4HPR caused elevations in cytosolic levels of quinone reductase and glutathione-S-transferase, respectively. Scans of sodium dodecyl sulfate-polyacrylamide gels of microsomal proteins from the livers of retinoid-dosed animals showed changes in both the intensities and the number of stained bands. For microsomes from 13cisRA-dosed animals, there were additional changes in the absorption maximum of the carbon monoxide and octylamine difference spectra. There was, compared to controls, a 62% reduction in the NADPH-dependent binding of (+)-7S-trans-7,8-dihydro[7-14C]benzo(a)pyrene-7,8-diol to microsomal proteins from 13cisRA-dosed animals. Fluorography of the sodium dodecyl sulfate-polyacrylamide gels showed that the major reduction in metabolite binding occurred in the Mr 50,000 region of the gel. The reduction in the NADPH-dependent binding of (+)-7S-trans-7,8-dihydro[7-14C]benzo(a)pyrene-7,8-diol to microsomal proteins in vitro and the reduction in hepatic arylhydrocarbon hydroxylase levels correlated with a reduction in the in vivo binding of benzo(a)pyrene to rat liver DNA. Animals dosed for 7 days with 13cisRA, retinyl acetate, or 4HPR showed a 38, 27, and 40% reduction in binding of benzo(a)pyrene to liver DNA and a 29, 32, and 21% reduction in binding to stomach DNA, respectively, when the carcinogen was administered on the eighth day, and the tissues were harvested 24 h later. Binding to lung DNA was reduced by 23 and 11%, respectively, in the 13cisRA- and 4HPR-dosed rats. No differences were observed in binding to kidney. Thus, retinoids, by altering the metabolism of carcinogens, could influence the initiation stage of carcinogenesis." @default.
• W2101900231 created "2016-06-24" @default.
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• W2101900231 creator A5058043204 @default.
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• W2101900231 date "1987-10-01" @default.
• W2101900231 modified "2023-09-23" @default.
• W2101900231 title "Effects of retinoids on metabolizing enzymes and on binding of benzo(a)pyrene to rat tissue DNA." @default.
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• W2101900231 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/3621188" @default.
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