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Ascorbic acid increases synaptosomal potassium-induced dopamine release

F Girbe1, C Ramassamy, C Piton

  • 1Unité de Neuropsychopharmacologie, CNRS URA 1170, Faculté de Médecine et Pharmacie de Rouen, Saint-Etienne du Rouvray, France.

Neuroreport
|May 9, 1994
PubMed
Summary
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Ascorbic acid (vitamin C) at physiological concentrations enhances the release of dopamine from brain synaptosomes. This finding suggests vitamin C may modulate dopamine neurotransmission in the brain.

Area of Science:

  • Neuroscience
  • Neurochemistry
  • Biochemistry

Background:

  • Ascorbic acid, also known as vitamin C, is an essential nutrient with known antioxidant properties.
  • Its role in neurotransmitter modulation, particularly dopamine, is not fully understood.
  • Synaptosomes are isolated nerve terminals crucial for studying neurotransmitter dynamics.

Purpose of the Study:

  • To investigate the effect of ascorbic acid on dopamine uptake and release in mouse striatal synaptosomes.
  • To determine if ascorbic acid modulates dopaminergic transmission.

Main Methods:

  • Preparation of synaptosomes from mouse striata.
  • Measurement of 3H-dopamine uptake in the presence of varying ascorbic acid concentrations.
  • Assessment of potassium-induced 3H-dopamine release with and without ascorbic acid and Ca2+.

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Main Results:

  • Ascorbic acid did not affect 3H-dopamine uptake at concentrations from 0.01 mM to 0.5 mM.
  • Ascorbic acid (0.1 mM) significantly increased potassium-induced 3H-dopamine release.
  • This release enhancement was dependent on the presence of Ca2+ and not observed with dehydroascorbic acid.

Conclusions:

  • Ascorbic acid, at endogenous concentrations, acts as a modulator of dopaminergic transmission.
  • It specifically enhances the release of dopamine from synaptosomes, suggesting a role in regulating dopamine signaling.
  • The Ca2+-dependent mechanism highlights a potential pathway for vitamin C's influence on neuronal communication.