Abstract
1. The atypical antipsychotic profile of (R)-(+)-2-amino-4-(4-fluorophenyl)-5-[1-[4-(4-fluorophenyl)-4-oxobutyl] pyrrolidin-3-yl] thiazole (NRA0045), a potent dopamine D4 and 5-hydroxytryptamine (5-HT)2A receptor antagonist, was examined in rats. 2. Spontaneous locomotor activity was decreased dose-dependently with i.p. administration of clozapine (ED50 3.7 mg kg-1), haloperidol (ED50 0.1 mg kg-1) and chlorpromazine (ED50 0.9 mg kg-1), whereas inhibition of this type of behaviour induced by i.p. administration of NRA0045, at doses up to 10 mg kg-1, did not exceed 50%. 3. Locomotor hyperactivity induced by methamphetamine (MAP, 2 mg kg-1, i.p.) in rats (a model of antipsychotic activity) was dose-dependently antagonized by NRA0045 (ED50 0.4 mg kg-1, i.p., and 0.3 mg kg-1, p.o., respectively), clozapine (ED50 0.3 mg kg-1, i.p. and 0.8 mg kg-1, p.o., respectively), haloperidol (ED50 0.02 mg kg-1, i.p. and 0.1 mg kg-1, p.o., respectively), chlorpromazine (ED50 0.3 mg kg-1, i.p. and 3.3 mg kg-1, p.o., respectively). In contrast, the MAP (3 mg kg-1, i.v.)-induced stereotyped behaviour in rats (a model of extrapyramidal symptoms) was not affected by NRA0045 or clozapine, at the highest dose given (30 mg kg-1, i.p.). Haloperidol (ED50 ...Continue Reading
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