The role of glycineB binding site and glycine transporter (GlyT1) in the regulation of [3H]GABA and [3H]glycine release in the rat brain

L. Hársing, Sandor Solyom, Cecilia Salamon

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The effect of N-methyl-D-aspartic acid (NMDA), a selective glutamate receptor agonist, on the release of previously incorporated [3H]γ-aminobutyric acid(GABA) was examined in superfused striatal slices of the rat. NMDA (0.01 to 1.0 mM) increased [3H]GABA overflow with an EC50 value of 0.09 mM. The [3H]GABA releasing effect of NMDA was an external Ca2+-dependent process and the GABA uptake inhibitor nipecotic acid (0.1 mM) potentiated this effect. These findings support the view that NMDA evokes GABA release from vesicular pool in striatal GABAergic neurons. Addition of glycine (1 mM), a cotransmitter for NMDA receptor, did not influence the NMDA-induced [3H]GABA overflow. Kynurenic acid (1 mM), an antagonist of glycineB site, decreased the [3H]GABA-releasing effect of NMDA and this reduction was suspended by addition of I mM glycine. Neither glycine nor kynurenic acid exerted effects on resting [3H]GABA outflow. These data suggest that glycineB binding site at NMDA receptor may be saturated by glycine released from neighboring cells. Glycyldodecylamide (GDA) and N-dodecylsarcosine, inhibitors of glycineT1 transporter, inhibited the uptake of [3H]glycine (IC50 33 and 16 μM) in synaptosomes prepared from rat hippocampus. When hippocampal slices were loaded with [3H]glycine, resting efflux was detected whereas electrical stimulation failed to evoke [3H]glycine overflow. Neither GDA (0.1 mM) nor N-dodecylsarcosine (0.3 mM) influenced [3H]glycine efflux. Using Krebs-bicarbonate buffer with reduced Na+ for superfusion of hippocampal slices produced an increased [3H]glycine outflow and electrical stimulation further enhanced this release. These experiments speak for glial and neuronal [3H]glycine release in hippocampus with a dominant role of the former one. GDA, however, did not influence resting or stimulated [3H]glycine efflux even when buffer with low Na+ concentration was applied.

Original languageEnglish
Pages (from-to)915-923
Number of pages9
JournalNeurochemical Research
Volume26
Issue number8-9
DOIs
Publication statusPublished - 2001

Fingerprint

Glycine Plasma Membrane Transport Proteins
Glycine
gamma-Aminobutyric Acid
Rats
Brain
N-Methylaspartate
Binding Sites
GABA Agents
Kynurenic Acid
Corpus Striatum
Electric Stimulation
Hippocampus
Buffers
GABA Uptake Inhibitors
Aminobutyrates
Excitatory Amino Acid Agonists
GABAergic Neurons
Synaptosomes
Glutamate Receptors
Bicarbonates

Keywords

  • [H]GABA release
  • [H]glycine release
  • Glycine binding site
  • GlycineT1 transporter
  • Hippocampal slices
  • Striatal slices

ASJC Scopus subject areas

  • Neuroscience(all)
  • Biochemistry

Cite this

The role of glycineB binding site and glycine transporter (GlyT1) in the regulation of [3H]GABA and [3H]glycine release in the rat brain. / Hársing, L.; Solyom, Sandor; Salamon, Cecilia.

In: Neurochemical Research, Vol. 26, No. 8-9, 2001, p. 915-923.

Research output: Contribution to journalArticle

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