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Br J Psychiatry. 2000 Nov;177:408-15.

Striatal and extra-striatal D(2)/D(3) dopamine receptor occupancy by quetiapine in vivo. [(123)I]-epidepride single photon emission tomography(SPET) study.

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  • 1Institute of Psychiatry, London.

Abstract

BACKGROUND:

Selective action at limbic cortical dopamine D(2)-like receptors could mediate atypical antipsychotic efficacy with few extrapyramidal side-effects.

AIMS:

To test the hypothesis that quetiapine has 'limbic selective' D(2)/D(3) receptor occupancy in vivo.

METHOD:

The high-affinity D(2)/D(3) ligand [(123)I]-epidepride and single photon emission tomography were used to estimate D(2)/D(3) specific binding and an index of relative percentage D(2)/D(3) occupancy in striatal and temporal cortical regions for quetiapine-treated patients (n=6). Quetiapine-, and previously studied typical-antipsychotic- and clozapine-treated patients were compared.

RESULTS:

Mean (s.d.) relative percentage D(2)/D(3) receptor occupancy by quetiapine was 32.0% (14.6) in striatum and 60.1% (17.2) in temporal cortex (mean daily dose 450 mg: range 300-700 mg/day). Quetiapine treatment resulted in limbic selective D(2)/D(3) blockade similar to clozapine and significantly higher than typical antipsychotics.

CONCLUSIONS:

Preliminary data suggest that limbic selective D(2)/D(3) receptor blockade is important for atypical drug action.

PMID:
11059993
[PubMed - indexed for MEDLINE]
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