Inhibition of 3H-clozapine binding in rat brain after oral administration of neuroleptics |
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Authors: | Hans R. Bürki |
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Affiliation: | Research Institute Wander, a Sandoz Research Unit, Wander Ltd, P.O. Box 2747 Berne, Switzerland |
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Abstract: | Clozapine, thioridazine, perlapine, clothiapine, chlorpromazine, NT 104–252, loxapine or haloperidol were administered orally, and atropine subcutaneously, to rats. The animals were decapitated, brain tissue was removed and homogenized in tris buffer and incubated with 3H-clozapine. Total and nonspecifically bound 3H-clozapine were measured in each preparation. A dose-dependent inhibition of specific 3H-clozapine binding of more than 50% was observed only after the administration of clozapine or thioridazine. There was no correlation between inhibition of 3H-clozapine binding and that of 3H-haloperidol, a specific ligand for DA-receptors. 3H-Clozapine receptor density was much greater than 3H-haloperidol receptor density, suggesting that the majority of clozapine binding sites are not DA-receptors. |
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