Identification of Uridine 5′-Diphosphate-Glucuronosyltransferases Responsible for the Glucuronidation of Mirabegron, a Potent and Selective β3-Adrenoceptor Agonist, in Human Liver Microsomes
| Autor: | Kentaro Konishi, Daisuke Tenmizu, Shin Takusagawa |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Pharmacology
chemistry.chemical_classification biology Mefenamic acid Chemistry Glucuronidation 030226 pharmacology & pharmacy Enzyme assay Uridine UGT2B7 03 medical and health sciences chemistry.chemical_compound 0302 clinical medicine Enzyme Biochemistry 030220 oncology & carcinogenesis Microsome biology.protein medicine Pharmacology (medical) Mirabegron medicine.drug |
| Zdroj: | European Journal of Drug Metabolism and Pharmacokinetics. 43:301-309 |
| ISSN: | 2107-0180 0378-7966 |
| Popis: | Mirabegron is cleared by multiple mechanisms, including drug-metabolizing enzymes. One of the most important clearance pathways is direct glucuronidation. In humans, M11 (O-glucuronide), M13 (carbamoyl-glucuronide), and M14 (N-glucuronide) have been identified, of which M11 is one of the major metabolites in human plasma. The objective of this study was to identify the uridine 5′-diphosphate (UDP)-glucuronosyltransferase (UGT) isoform responsible for the direct glucuronidation of mirabegron using human liver microsomes (HLMs) and recombinant human UGTs (rhUGTs). Reaction mixtures contained 1–1000 μM mirabegron, 8 mM MgCl2, alamethicin (25 μg/mL), 50 mM Tris–HCl buffer (pH 7.5), human liver microsome (HLM) or rhUGT (1.0 mg protein/mL), and 2 mM UDP-glucuronic acid in a total volume of 200 μL for 120 min at 37 °C. HLMs from 16 individuals were used for the correlation study, and mefenamic acid and propofol were used for the inhibition study. Regarding M11 formation, rhUGT2B7 showed high activity among the rhUGTs tested (11.3 pmol/min/mg protein). This result was supported by the correlation between M11 formation activity and UGT2B7 marker enzyme activity (3-glucuronidation of morphine, r 2 = 0.330, p = 0.020) in individual HLMs; inhibition by mefenamic acid in pooled HLMs (IC50 = 22.8 μM); and relatively similar K m values between pooled HLMs and rhUGT2B7 (1260 vs. 486 μM). Regarding M13 and M14 formation, rhUGT1A3 and rhUGT1A8 showed high activity among the rhUGTs tested, respectively. UGT2B7 is the main catalyst of M11 formation in HLMs. Regarding M13 and M14 formation, UGT1A3 and UGT1A8 are strong candidates for glucuronidation, respectively. |
| Databáze: | OpenAIRE |
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