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Dopamine D3 receptor modulation of dopamine efflux in the rat nucleus accumbens.

Authors: Roberts, C  Cummins, R  Gnoffo, Z  Kew, JN 
Citation: Roberts C, etal., Eur J Pharmacol. 2006 Mar 18;534(1-3):108-14. Epub 2006 Feb 21.
Pubmed: (View Article at PubMed) PMID:16490190
DOI: Full-text: DOI:10.1016/j.ejphar.2006.01.014

The effect of antipsychotics on electrically evoked dopamine efflux in the rat nucleus accumbens core and shell was investigated, using in vitro fast cyclic voltammetry. In the nucleus accumbens core, the dopamine D2/D3 receptor agonist, (+/-)7-OH-DPAT ((+/-)-2-dipropylamino-7-hydroxy-1,2,3,4-tetrahydronaphthalene), inhibited dopamine efflux with a pEC50 of 8.1. Clozapine, haloperidol, sulpiride and the selective dopamine D3 receptor antagonist, SB-277011-A, had no effect on dopamine efflux per se but all attenuated the (+/-)7-OH-DPAT-induced-inhibition of dopamine efflux, with pA2 values of 6.6, 7.9, 7.0 and 7.6, respectively. In the nucleus accumbens shell, (+/-)7-OH-DPAT inhibited dopamine efflux with a pEC50 of 8.3. Clozapine and SB-277011-A had no effect on dopamine efflux. In contrast, haloperidol and sulpiride significantly increased dopamine efflux through a D2 receptor-mediated mechanism. Clozapine, haloperidol, sulpiride and SB-277011-A attenuated the (+/-)7-OH-DPAT-induced inhibition with pA2 values of 7.3, 8.6, 7.6 and 8.2, respectively. These data demonstrate that dopamine efflux is modulated by both dopamine D2 and D3 receptors in the rat nucleus accumbens.

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CRRD Object Information
CRRD ID: 1625068
Created: 2007-05-18
Species: All species
Last Modified: 2007-05-18
Status: ACTIVE



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