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• W2013903932 abstract "Uridine diphospho-glucuronosyltransferases (UGTs) inactivate and facilitate the excretion of estrogens to glucuronides (-G), the most abundant circulating estrogen conjugates. The identity of the conjugated estrogens formed by all known overexpressed UGTs (n = 16) was analyzed by comparison with retention time and mass fragmentation of authentic standards by HPLC tandem mass spectrometry methods. Six UGTs, namely 1A1, 1A3, 1A8, 1A9, 1A10, and 2B7, were found to glucuronidate estradiol (E(2)) and estrone (E(1)), their hydroxyls (OH), and their methoxy derivatives (MeO). Addition of glucuronic acid was catalyzed by specific UGTs at positions 2, 3, and 4 of the estrogens, whereas only E(2) was conjugated at position 17 by UGT2B7. Kinetic parameters indicate that the conjugation of E(2) at position 3 was predominantly catalyzed by 1A1, 1A3, and 1A8 and by 1A8 for E(1). Conjugation of 2-OHE(1)/E(2) and 2- and 4-MeOE(1)/E(2) was selective at position 3, mostly catalyzed by 1A1 and 1A8. Of all UGTs, UGT2B7 demonstrated the highest catalytic activities for estrogens and at least 10- to 50-fold higher activity for the conjugation of genotoxic 4-hydroxycatecholestrogens at position 4, compared with the conjugation of E(2), E(1), and 2-hydroxycatecholestrogens. Its presence was further shown in the endometrium by RT-PCR and immunohistochemistry, localizing in the same cells expressing CYP1B1, involved locally in the formation of 4-hydroxycatecholestrogens. Data show that several UGT enzymes detected in the endometrium are involved in the glucuronidation of E(2) and its 2-OH, 4-OH, and 2-MeO metabolites that exert various biological effects in the tissue." @default.
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• W2013903932 date "2004-10-01" @default.
• W2013903932 modified "2023-10-17" @default.
• W2013903932 title "Specificity and Regioselectivity of the Conjugation of Estradiol, Estrone, and Their Catecholestrogen and Methoxyestrogen Metabolites by Human Uridine Diphospho-glucuronosyltransferases Expressed in Endometrium" @default.
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• W2013903932 doi "https://doi.org/10.1210/jc.2004-0331" @default.
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