Probe substrate and enzyme source-dependent inhibition of UDP-glucuronosyltransferase (UGT) 1A9 by wogonin |
| |
Authors: | Gao Chengcheng Xie Rui Ma Tianheng Yan Wei Pang Liqun |
| |
Affiliation: | Department of Gastroenterology, Huai''an First People''s Hospital, Nanjing Medical University, 6 Beijing Road West, Huai''an, Jiangsu 223300, P. R. China |
| |
Abstract: | BackgroundDrug-metabolizing enzymes (DMEs) inhibition based drug-drug interaction and herb-drug interaction severely challenge the R&D process of drugs or herbal ingredients.ObjectiveTo evaluate the inhibition potential of wogonin (an important flavonoid isolated from the root of Scutellaria baicalensis) towards one of the most important phase II DMEs, UDP-glucuronosyltransferase (UGT) 1A9.MethodsBoth recombinant UGT1A9-catalyzed 4-methylumbelliferone (4-MU) glucuronidation reaction and human liver microsomes (HLMs)-catalyzed propofol glucuronidation reaction were used as two different probe reactions.ResultsWogonin noncompetitively inhibited recombinant UGT1A9-catalyzed 4-MU glucuronidation, and exerted competitive inhibition towards HLMs-catalyzed propofol glucuronidation. The inhibition kinetic parameters (Ki) were calculated to be 3.2 µM and 52.0µM, respectively.ConclusionNecessary monitoring was needed when wogonin was co-administered with the clinical drugs mainly undergoing UGT1A9-mediated glucuronidation elimination. Additionally, probe reactions-dependent inhibition of wogonin towards the activity of UGT1A9 should be paid attention when translating these in vitro data into in vivo situation. |
| |
Keywords: | wogonin drug-drug interaction (DDI) UDP-glucuronosyltransferases (UGTs) |
|
|