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• W2021536819 startingPage "363" @default.
• W2021536819 abstract "2-Hydroxylation is one of the major metabolic pathways of estrogens and is believed to be catalyzed by a form of cytochrome P450. Recently it has been reported that estrogen 2-hydroxylase activity in human placenta is catalyzed by aromatase. Some investigators suggested the effect of catechol estrogen on human placental steroidogenesis which may be related to pregnancy-induced hypertension (PIH) through the inhibition of catechol-O-methyltransferase (COMT) activity. In order to better understand the interrelationship between placental aromatase and estrogen 2-hydroxylase activities in PIH patients, both activities were evaluated in the PIH placentas. Human placental microsomes obtained from PIH patients were incubated with [1 beta-3H]androstenedione or [2-3H]estradiol in the presence of NADPH. Aromatase and estrogen 2-hydroxylase activities were assessed by the tritium water method. The immunosuppression patterns of both activities due to monoclonal antiaromatase cytochrome P450 antibody (MAb3-2C2) were studied. Estrogen 2-hydroxylase activity was significantly higher in PIH placentas (4.7 +/- 0.9 pmol/min/mg protein, n = 7) than in normal placentas (3.0 +/- 0.7 pmol/min/mg protein, n = 7). When the PIH placental microsomes were subjected to immunosuppression by 1 to 100 micrograms IgG of MAb3-2C2, estrogen 2-hydroxylase activity was suppressed by 94 to 65% whereas aromatase activity was strongly suppressed by 72 to 17%, respectively. From our results of high estrogen 2-hydroxylase activity in PIH placentas, it is assumed that there is a different estrogen catalyzing mechanism in PIH placentas." @default.
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• W2021536819 date "1996-01-01" @default.
• W2021536819 modified "2023-09-25" @default.
• W2021536819 title "Aromatase and Estrogen 2-Hydroxylase Activities of Human Placental Microsomes in Pregnancy-Induced Hypertension." @default.
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• W2021536819 doi "https://doi.org/10.1507/endocrj.43.363" @default.
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