A specific hydroxysteroid UGT is responsible for the conjugation of aliphatic alcohols in rats: an estimation of the importance of glucuronidation versus oxidation

Alcohol
S Iwersen, A Schmoldt

Abstract

UDP-glucuronosyltransferase (UGT) activity for aliphatic alcohols was determined in microsomal liver fractions of Wistar rats. The rats were pretreated with inducers of cytochrome P450 and UGTs [phenobarbital (PB), beta-naphtoflavone (betaNF), and ethanol (10%)], and inhibition experiments with aliphatic alcohols and specific substrates for UGTs were performed to characterize the UGT form(s) responsible for the glucuronidation of aliphatic alcohols. Several UGT isoforms were purified from liver microsomes of low-androsterone-conjugating activity (LA), controls, and ethanol-pretreated rats by chromatofocusing and affinity chromatography. The results show aliphatic alcohols to be specific substrates for 17beta-hydroxysteroid UGT with considerable glucuronidation rates. This elimination pathway for aliphatic alcohols is not inducible by the tested inducers. Compared with kinetic data of oxidation, glucuronidation is probably the main elimination pathway for alcohols with a longer chain length than C3, especially when oxidation pathways are inhibited by the presence of proportionately high ethanol concentrations.

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Citations

Jul 10, 2004·Menopause : the Journal of the North American Menopause Society·Carol A ShivelyJ Mark Cline
Mar 5, 2010·Drug Metabolism and Disposition : the Biological Fate of Chemicals·Golriz RadI Glenn Sipes
Jul 30, 2004·Alcohol·Sabine JurowichHerbert Käferstein
Aug 13, 2010·Food and Chemical Toxicology : an International Journal Published for the British Industrial Biological Research Association·D BelsitoUNKNOWN RIFM Expert Panel
Dec 25, 2008·Die Naturwissenschaften·John R Hutchinson, Vivian Allen
Jul 20, 2021·Forensic Science International : Synergy·Cora WunderStefan W Toennes

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