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Linoleic acid diols are novel substrates for human UDP-glucuronosyltransferases
A R Jude1, J M Little, J P Freeman
1Department of Pharmacology and Toxicology, University of Arkansas for Medical Sciences, Little Rock, Arkansas 72205, USA.
Archives of Biochemistry and Biophysics
|August 10, 2000
Summary
Human liver microsomes actively glucuronidate linoleic acid diols, a key step in their metabolism. This process, involving hydroxyl group conjugation, is crucial for biotransformation in humans.
Area of Science:
- Biochemistry
- Human Metabolism
- Drug Discovery
Background:
- Linoleic acid diol glucuronides are found in urine of patients with peroxisomal disorders.
- Understanding linoleic acid diol metabolism is crucial for human health.
Purpose of the Study:
- Investigate glucuronidation of linoleic acid and its diols by human liver microsomes.
- Determine the role of glucuronide conjugation in linoleic acid diol metabolism.
Main Methods:
- Isolation and analysis of glucuronide products using Thin Layer Chromatography (TLC) and High-Performance Liquid Chromatography-Mass Spectrometry (HPLC-MS).
- Kinetic analysis (K(m) and V(max)) of glucuronidation.
- Assays using purified linoleic acid diol enantiomers.
Main Results:
- HPLC-MS confirmed singly glucuronidated linoleic acid diols.
- TLC indicated glucuronidation occurs at a hydroxyl position.
- Kinetic analysis revealed high affinity (K(m) 50-200 microM) and significant rates (V(max) 5-12 nmol/mg x min).
- Glucuronidation occurred at only one hydroxyl group per enantiomer.
Conclusions:
- Human liver microsomes actively glucuronidate hydroxylated fatty acids.
- Glucuronidation is a significant pathway in the human biotransformation of linoleic acid diols.