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• W2100067147 abstract "Chlorinated hydrocarbons (CHCs) are environmental contaminants that bioaccumulate and hence are detected in human tissues. Epidemiological evidence suggests that the increased incidence of a variety of human cancers, such as lymphoma, leukemia and liver and breast cancers, might be attributed to exposure to these agents. The ability of CHCs to disrupt estrogen homeostasis is hypothesized to be responsible for their biological effects. The present study examined the effect of CHCs on the expression of cytochrome P450 (CYP)1A1, CYP1A2 and CYP1B1 mRNAs and the consequent 2- and 4-hydroxylation of 17beta-estradiol (E(2)) in female Sprague-Dawley rats. Animals were administered a single dose of the LD(50) of 2,3,7, 8-tetrachlorodibenzo-p-dioxin (TCDD) (25 microg/kg), 2, 4-dichlorophenoxyacetic acid (2,4-D) (375 mg/kg) and dieldrin (DED) (38 mg/kg) by gavage. Seventy-two hours after treatment, increased expression of CYP1A1, CYP1A2 and CYP1B1 was observed in the liver, kidney and mammary tissue. Since CYP1A and CYP1B1 are the major enzymes catalyzing 2- and 4-hydroxylation of E(2), respectively, the effect of these CHCs on the metabolism of E(2) was investigated in rat tissues. Formation of 2- and 4-catechol estrogens was increased in a tissue-specific manner in response to treatment. TCDD was the most potent inducer for CYP1 enzyme mRNA and for the 2- and 4-hydroxylation of E(2). 2,4-D and DED induced similar responses, but less than that of TCDD. These results suggest that induction of CYP1 family enzymes and consequent increases in estrogen metabolism by CHCs in target tissues may be factors contributing to the biological effects associated with exposure to these agents." @default.
• W2100067147 created "2016-06-24" @default.
• W2100067147 creator A5058789108 @default.
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• W2100067147 date "2000-08-01" @default.
• W2100067147 modified "2023-09-24" @default.
• W2100067147 title "Effect of chlorinated hydrocarbons on expression of cytochrome P450 1A1, 1A2 and 1B1 and 2- and 4-hydroxylation of 17β-estradiol in female Sprague–Dawley rats" @default.
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• W2100067147 doi "https://doi.org/10.1093/carcin/21.5.593" @default.
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