Coexistence of Carriers for Dopamine and GABA Uptake on a Same Nerve Terminal in the Rat Brain

Overview

Journal Br J Pharmacol

Publisher Wiley

Specialty Pharmacology

Date 1987 May 1

PMID 3594080

Citations 8

Authors

G Bonanno

M Raiteri

Affiliations

Soon will be listed here.

Abstract

The ability of gamma-aminobutyric acid (GABA) to affect the release of [3H]-dopamine in rat brain synaptosomes prepared from corpus striatum, frontal cortex and hypothalamus and prelabelled with the radioactive catecholamine in the presence of desipramine was examined. GABA (10-300 microM) increased in a concentration-dependent way the basal release of [3H]-dopamine from striatum and cortical synaptosomes; however, its effect was much less pronounced in hypothalamic nerve terminals. 2,4-Diaminobutyric acid (DABA) mimicked GABA although less potently. Neutral amino acids such as leucine, valine or alpha-aminoisobutyric acid (100-300 microM) did not affect or increased minimally the release of [3H]-dopamine. The GABA-induced [3H]-dopamine release was not prevented by the GABAA-receptor antagonists, bicuculline or picrotoxin. The GABAA-receptor agonist, muscimol (10-300 microM), displayed only a very weak, not significant, enhancing effect on [3H]-dopamine release. The GABAB-receptor agonist (-)-baclofen (100 or 300 microM) had no effect. Three novel and selective inhibitors of GABA uptake, N-(4,4-diphenyl-3-butenyl)-nipecotic acid (SK&F 89976A), N-(4,4-diphenyl-3-butenyl)-guvacine (SK&F 100330A) and N-(4,4-diphenyl-3-butenyl)-homo-beta-proline (SK&F 100561) potently counteracted the enhancing effect of GABA on [3H]-dopamine release. Nipecotic acid also reduced the effect of GABA. It is concluded that carriers for the uptake of dopamine and GABA may coexist on the same nerve terminal in the rat brain.

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