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Brain Res Bull. 2001 Jan 15;54(2):153-7.

Involvement of NMDA and AMPA/kainate receptors in the effects of endogenous glutamate on extracellular concentrations of dopamine and GABA in the nucleus accumbens of the awake rat.

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  • 1Department of Physiology, Faculty of Medicine, Universidad Complutense, Madrid, Spain.

Abstract

We have investigated the effects of perfusion of the N-methyl-D-aspartate (NMDA) receptor antagonist 3-((R)-2-carboxypiperazin-4-yl)-propyl-1-phosphonic acid (CPP) and the alpha-amino-3-hydroxy-5-methyl-isoxazole-4-propionic acid (AMPA)/kainate receptor antagonist 6,7-dinitroquinoxaline-2,3-dione (DNQX) on the endogenous glutamate-evoked changes of extracellular dopamine and alpha-aminobutyric acid (GABA) in the nucleus accumbens of the awake rat. Local infusion of the glutamate uptake inhibitor L-trans-pyrrolidine-2,4-dicarboxilic acid in the nucleus accumbens produced an increase in extracellular concentrations of glutamate, dopamine, and GABA. At the dose of 4 mM, the increase of extracellular glutamate, dopamine, and GABA were 3.73 +/- 0.46 microM (n = 8; p < 0.001), 4.70 +/- 0.92 nM (n = 6; p < 0.001) and 0.36 +/- 0.08 microM (n = 8; p < 0.001), respectively. Perfusion of the NMDA-receptor antagonist CPP attenuated the increases of dopamine by 90% (n = 5; p < 0.001), but enhanced the increases of GABA by 70% (n = 7; p < 0.01). Perfusion of the AMPA-receptor antagonist DNQX did not attenuate the increases of GABA. These results suggest a differential mediation of ionotropic glutamatergic receptors in the actions of endogenous glutamate on extracellular concentration of dopamine and GABA.

PMID:
11275404
[PubMed - indexed for MEDLINE]
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