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Effects of valproic acid on organic acid metabolism in children: a metabolic profiling study

K E Price1, R E Pearce, U C Garg

  • 1Division of Clinical Pharmacology and Medical Toxicology, Department of Pediatrics, Children's Mercy Hospitals and Clinics, Kansas City, Missouri, USA.

Clinical Pharmacology and Therapeutics
|May 6, 2011
PubMed

Insights

Valproic acid (VPA) treatment in children shows distinct urinary organic acid profiles, differing from carbamazepine (CBZ) and healthy controls. This suggests potential biomarkers for VPA hepatotoxicity risk in pediatric patients.

Area of Science:

  • Pediatric pharmacology
  • Clinical chemistry
  • Metabolomics

Background:

  • Young children face a higher risk of valproic acid (VPA) induced liver damage (hepatotoxicity).
  • Urinary organic acid profiles can serve as indicators of mitochondrial function.

Purpose of the Study:

  • To investigate urinary organic acid profiles in children treated with VPA for seizure disorders.
  • To compare these profiles with those of children treated with carbamazepine (CBZ) and healthy children.
  • To identify potential biomarkers for VPA hepatotoxicity.

Main Methods:

  • Collected urinary organic acid profiles from 52 children on VPA, 50 on CBZ, and 22 healthy controls (ages 1.9-17.3).
  • Utilized principal-component analysis (PCA) to analyze and compare the organic acid profiles.
  • Examined age-related changes and interindividual variability in metabolic pathways.

Main Results:

  • Distinct urinary organic acid profiles were observed in children treated with VPA compared to both CBZ and healthy control groups.
  • Age-related changes in organic acid profiles occurred across all groups.
  • VPA treatment showed interindividual variability in alterations related to branched-chain amino acid metabolism and oxidative stress.

Conclusions:

  • Urinary organic acid profiling can differentiate VPA treatment from CBZ and healthy states in children.
  • Metabolomic analysis holds promise for identifying predictive biomarkers for VPA-induced hepatotoxicity in pediatric populations.
  • Further research into these metabolic alterations may elucidate mechanisms of VPA toxicity.

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