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• W1970781901 abstract "We previously reported that when primary cultures of rat hepatocytes were treated with phenobarbital (PB) or one of several organochlorine pesticides, including Mirex, there was co-induction of cytochrome P450 2B1 and 2B2 mRNAs and immunoreactive proteins, whereas Kepone selectively induced 2B2 (Kocarek et al. (1991) Mol. Pharmacol. 40, 203-210). Indeed, Kepone treatment actively suppressed induction of 2B1 and 2B2 mRNAs in hepatocytes cotreated with phenobarbital. Because Kepone differs chemically from Mirex only in the replacement of 2 chlorine atoms with a ketone group, which exists in aqueous solution as a gem-diol and appears to confer weak estrogenic properties, we treated hepatocyte cultures with one of 3 potent estrogens, beta-estradiol, 17 alpha-ethinylestradiol or diethylstilbestrol. Treatment with each of these estrogens induced 2B1 and 2B2 mRNA only at very high doses (10(-4) M). Beta-Estradiol (10(-4) M) treatment also induced 2B1/2 mRNA in hepatocyte cultures prepared from a prepubescent female rat. The anti-estrogen tamoxifen failed to reverse 2B1/2 mRNA induction following beta-estradiol or Kepone treatment of adult hepatocyte cultures. High doses of beta-estradiol or 17 alpha-ethinylestradiol failed to induce 2B1/2 mRNA in treated rats. We also examined the effects of chloral hydrate, a simple gem-diol, on 2B1/2 mRNA induction in the hepatocyte cultures. Treatment with chloral hydrate (3 x 10(-3) M), like Kepone (10(-5) M), suppressed 2B1/2 mRNA induction following phenobarbital (10(-4) M) treatment, while Kepone alcohol (10(-5) M), which is not a gem-diol, produced less suppression. Our results suggest that selective induction by Kepone of 2B2 is unlikely related to its effects as a weak classical estrogen, while the ability of Kepone to suppress induction of 2B1 and 2B2 by PB may be related to its properties as a gem-diol." @default.
• W1970781901 created "2016-06-24" @default.
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• W1970781901 date "1994-04-01" @default.
• W1970781901 modified "2023-09-25" @default.
• W1970781901 title "Regulation of cytochrome P450 2B1/2 mRNAs by Kepone® (chlordecone) and potent estrogens in primary cultures of adult rat hepatocytes on Matrigel" @default.
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• W1970781901 doi "https://doi.org/10.1016/0378-4274(94)90179-1" @default.
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