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• W1555952014 abstract "Dihydrodiol dehydrogenase (DD; EC 1.3.1.20) catalyzes a novel pathway of polycyclic aromatic hydrocarbon (PAH) metabolism in which trans-dihydrodiols (proximate carcinogens) are oxidized to reactive o-quinones which are cytotoxic and genotoxic. In this study, the complementary DNA for rat liver DD was used to examine the structure and regulation of the DD gene. Southern analysis of rat genomic DNA confirmed that DD is a member of the multigene aldo-keto reductase superfamily. Conservative estimates indicate that the rat DD gene is at least 20-25 kilobases in length. Northern analysis showed that the rat liver transcript was 2.4 kilobases whereas the complementary DNA contains an open-reading frame of 966 nucleotides. Primer extension of male and female polyadenylated RNA indicated that the major transcription start sites are only 53 and 54 base pairs upstream from the translation start site, confirming that the RNA has a very long 3'-untranslated region. In male and female tissues, 2.4 kilobase transcripts predominate in liver, small intestine, and lung, which is consistent with a role for the enzyme in PAH metabolism. Transcripts were also detected in male (prostate)- and female (ovary, mammary gland, and uterus)-specific tissues. In the ovary, two transcripts were observed of 2.4 and 1.4 kilobases in length. Using benzenedihydrodiol as a model substrate for PAH trans-dihydrodiols, highest levels of DD activity were observed in the liver and small intestine of both sexes. Enzyme activity is 2.5-fold higher in the female liver versus the male liver. This sexual dimorphism can be explained by increases in the DD mRNA and enzyme protein as measured by dot-blot and immunotitration analyses, respectively. The latter measurements indicate that DD represents 1.0% of the soluble protein in female liver but is only 0.5% of the soluble protein in male liver. Hormonal ablation (ovariectomy and hypophysectomy) abolishes the sexual dimorphism observed in levels of DD mRNA, enzyme protein, and enzyme activity. Administration of estrogens to males is sufficient to establish the female pattern of gene expression. These data indicate that DD gene expression is hormonally regulated, that estrogens exert their effect at the level of the mRNA, and that aldo-keto reductases involved in PAH metabolism may have their expression regulated by female sex hormones." @default.
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• W1555952014 date "1994-01-01" @default.
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• W1555952014 title "Rat dihydrodiol dehydrogenase: complexity of gene structure and tissue-specific and sexually dimorphic gene expression." @default.
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