UDP-glucuronosyltransferases and clinical drug-drug interactions.

Author(s): Kiang TK, Ensom MH, Chang TK

Affiliation(s): Faculty of Pharmaceutical Sciences, The University of British Columbia, 2146 East Mall, Vancouver, British Columbia, V6T 1Z3, Canada.

Publication date & source: 2005-04, Pharmacol Ther., 106(1):97-132. Epub 2005 Jan 12.

Publication type: Review

UDP-glucuronosyltransferase (UGT) enzymes catalyze the conjugation of various endogenous substances (e.g., bilirubin) and exogenous compounds (e.g., drugs). The human UGT superfamily is comprised of 2 families (UGT1 and UGT2) and 3 subfamilies (UGT1A, UGT2A, and UGT2B). Many of the individual UGT enzymes are expressed not only in liver but also in extrahepatic tissues, where the extent of glucuronidation can be substantial. Several others (e.g., UGT1A7, UGT1A8, and UGT1A10) are expressed only in extrahepatic tissues. The molecular regulation of UGT enzyme is still not fully understood, but various transcription factors appear to play a regulatory role. The expression of individual UGT enzymes is subject to genetic polymorphism and these enzymes can be inhibited or induced by xenobiotics. Experimental evidence in humans indicates that the glucuronidation of acetaminophen, codeine, zidovudine, carbamazepine, lorazepam, and propafenone can influenced by specific interacting drugs. In contrast, the glucuronidation of diflunisal, morphine, naproxen, and temazepam is not affected appreciably by the drugs investigated to date. In general, UGT-mediated human drug interaction studies are difficult to interpret. The factors that complicate the interpretation of this type of drug interaction data are discussed.