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Related Experiment Videos

Delta 2-valproate biotransformation using human liver microsomal fractions.

G Fabre1, C Briot, E Marti

  • 1Sanofi Recherche, Montpellier, France.

Pharmaceutisch Weekblad. Scientific Edition
|June 19, 1992
PubMed
Summary

The metabolism of 2-n-propyl-2-pentenoate (delta 2-VPA) involves cytochrome P-450 and glucuronidation pathways. Human hepatic microsomal studies suggest UDP-glucuronosyltransferase-2B isoenzymes are involved in delta 2-VPA glucuronidation.

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Area of Science:

  • Pharmacology
  • Biochemistry
  • Drug Metabolism

Background:

  • 2-n-propyl-2-pentenoate (delta 2-VPA) is a compound whose metabolic fate requires elucidation.
  • Understanding drug metabolism is crucial for predicting efficacy and toxicity.

Purpose of the Study:

  • To investigate the biotransformation pathways of delta 2-VPA in human hepatic microsomes.
  • To identify the specific enzymes involved in delta 2-VPA glucuronidation.

Main Methods:

  • Incubation of delta 2-VPA with human hepatic microsomal fractions.
  • Analysis of metabolites using cytochrome P-450 and NADPH for oxidative pathways.
  • Study of glucuronidation using UDP-glucuronic acid and Brij 35, including kinetic analysis (Km, Vmax).
  • Investigating enzyme kinetics and substrate specificity with specific UDP-glucuronosyltransferase (UGT) isoenzyme substrates and inhibitors, including morphine.

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Main Results:

  • Delta 2-VPA undergoes oxidative metabolism to delta 3-VPA, delta 2,4-VPA, and VPA.
  • Significant interindividual variability was observed in delta 2-VPA glucuronidation.
  • Kinetic parameters (Km, Vmax) were determined for delta 2-VPA and VPA glucuronidation.
  • A strong correlation and mutual inhibition between delta 2-VPA and VPA glucuronidation suggest a common UGT isoenzyme.
  • Morphine, a UGT2B substrate, showed a good relationship with delta 2-VPA glucuronidation and competitively inhibited it, indicating involvement of UGT2B family enzymes.

Conclusions:

  • Delta 2-VPA is metabolized via both oxidative and glucuronidation pathways in human liver microsomes.
  • The glucuronidation of delta 2-VPA is likely mediated by one or more UGT isoenzymes within the UGT2B family.
  • These findings contribute to understanding the pharmacokinetics and potential drug interactions of delta 2-VPA.