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Chronic administration of valproic acid induces a decrease in rat striatal glutamate and taurine levels.

G B Acosta1, S I Wikinski, C C Bonelli

  • 1Instituto de Investigaciones Farmacológicas (ININFA), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Junín 956, 5° piso, 1113, Buenos Aires, Argentina.

Amino Acids
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Summary
This summary is machine-generated.

Chronic valproic acid (VPA) treatment in rats decreased endogenous glutamate and taurine levels in the brain. The study investigated VPA

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Area of Science:

  • Neuroscience
  • Neurochemistry
  • Pharmacology

Background:

  • Valproic acid (VPA) is a widely used antiepileptic and mood-stabilizing drug.
  • Its precise mechanisms of action, particularly concerning neurotransmitter modulation, require further elucidation.
  • Understanding VPA's effects on endogenous amino acids is crucial for its therapeutic application.

Purpose of the Study:

  • To investigate the impact of acute and chronic valproic acid (VPA) administration on specific endogenous amino acid levels.
  • To examine these effects in distinct brain regions: the cerebral frontal cortex and corpus striatum of rats.
  • To correlate changes in amino acid levels with neurotransmitter release.

Main Methods:

  • Rats were administered valproic acid (VPA) at 200 mg/kg (i.p.) for acute and chronic (10 days) treatments.
  • Endogenous levels of aspartate, glutamate, alanine, glycine, and taurine were quantified using High-Performance Liquid Chromatography (HPLC).
  • In vitro KCl-evoked release of glutamate was measured following chronic VPA administration.

Main Results:

  • Acute VPA treatment did not alter neurotransmitter levels in the corpus striatum.
  • Chronic VPA treatment significantly decreased endogenous glutamate (24%) and taurine (22%) levels in the corpus striatum.
  • The decrease in glutamate was associated with a significant increase (250%) in its in vitro KCl-evoked release; taurine release was unaffected.

Conclusions:

  • Chronic valproic acid (VPA) administration leads to a reduction in endogenous glutamate and taurine levels in the rat corpus striatum.
  • The observed decrease in glutamate is linked to enhanced release, suggesting a complex regulatory mechanism.
  • The clinical relevance of these neurochemical changes to VPA's therapeutic efficacy remains to be determined.