Journal article
UDP-glucuronosyltransferase (UGT) 2B15 pharmacogenetics: UGT2B15 D85Y genotype and gender are major determinants of oxazepam glucuronidation by human liver
The Journal of pharmacology and experimental therapeutics, Vol.310(2), pp.656-665
08/2004
Handle:
https://hdl.handle.net/2376/106081
PMID: 15044558
Abstract
Oxazepam is a commonly used 1,4-benzodiazepine anxiolytic drug that is polymorphically metabolized in humans. However, the molecular basis for this phenomenon is currently unknown. We have previously shown that S-oxazepam glucuronide, the major oxazepam metabolite, is selectively formed by UDP-glucuronosyltransferase (UGT) 2B15, whereas the minor R-oxazepam glucuronide is produced by multiple UGTs other than UGT2B15. Phenotype-genotype studies were conducted using microsomes and DNA prepared from the same set of 54 human livers. Sequencing of the UGT2B15 gene revealed three nonsynonymous polymorphisms, D85Y, T352I, and K523T, with variant allele frequencies of 0.56, 0.02, and 0.40, respectively. D85Y genotype showed a significant effect (p = 0.012) on S-oxazepam glucuronidation with lower median activities in 85Y/Y livers (49 pmol/min/mg protein) compared with 85D/D livers (131 pmol/min/mg), whereas 85D/Y livers were intermediate in activity (65 pmol/min/mg). There was also a significant trend (p = 0.049) for higher S-oxazepam activities in the two 352T/I livers (135 and 210 pmol/min/mg) compared with the remaining 352T/T livers (median, 64 pmol/min/mg). Conversely, K523T genotype had no apparent effect on oxazepam glucuronidation (p > 0.05). Donor gender also significantly influenced S-oxazepam glucuronidation with higher median activities in male (65 pmol/min/mg) compared with female (39 pmol/min/ mg) livers (p = 0.042). R-Oxazepam glucuronidation was not affected by either genotype or gender (p > 0.05). In conclusion, gender and D85Y genotype are identified as major determinants of S-oxazepam glucuronidation by human liver and may explain in part polymorphic oxazepam glucuronidation by human subjects.
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Details
- Title
- UDP-glucuronosyltransferase (UGT) 2B15 pharmacogenetics: UGT2B15 D85Y genotype and gender are major determinants of oxazepam glucuronidation by human liver
- Creators
- Michael H Court - Comparative and Molecular Pharmacogenetics Laboratory, Department of Pharmacology and Experimental Therapeutics, Tufts University School of Medicine, Boston, Massachusetts, USA. michael.court@tufts.eduQin HaoSoundararajan KrishnaswamyTanios Bekaii-SaabAbdul Al-RohaimiLisa L von MoltkeDavid J Greenblatt
- Publication Details
- The Journal of pharmacology and experimental therapeutics, Vol.310(2), pp.656-665
- Academic Unit
- Veterinary Clinical Sciences, Department of
- Publisher
- United States
- Grant note
- DK-58496 / NIDDK NIH HHS GM-61834 / NIGMS NIH HHS DA-05258 / NIDA NIH HHS AG-17880 / NIA NIH HHS AT-01381 / NCCIH NIH HHS RR- 00054 / NCRR NIH HHS DA-13209 / NIDA NIH HHS MH-58435 / NIMH NIH HHS
- Identifiers
- 99900547062301842
- Language
- English
- Resource Type
- Journal article