ISSN:
1432-1912
Keywords:
Key words Clozapine
;
Olanzapine
;
Loxapine
;
SCH 23390
;
Catalepsy
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Abstract Loxapine (0.3mg/kg s.c.), olanzapine (10 mg/ kg s.c.) and SCH 23390 (R-(+)-chloro-2, 3, 4, 5-tetrahydro-3-methyl-5-phenyl-1-H-3-benzazepine; 1mg/kg, s.c.), but not clozapine (10mg/kg, s.c.), induced catalepsy in rats. Co-administration of clozapine (1, 3 and 10mg/ kg s.c.) dose-dependently inhibited loxapine-induced catalepsy. Clozapine (10mg/kg s.c.) also prevented the induction of catalepsy by olanzapine. In addition, clozapine abolished the catalepsy induced by loxapine when it was administered after the response had fully developed. In contrast, the duration of SCH 23390-induced catalepsy was prolonged by clozapine, indicating that its anti-catalepsy effects against olanzapine and loxapine are unlikely to be caused by muscle relaxation, sedation or stimulation. Since SCH 23390-induced catalepsy is reported to be blocked by scopolamine, dizocilpine (MK-801) or 8-hydroxy-dipropylamino-tetralin, it is unlikely that muscarinic blockade, NMDA ion channel blockade and 5-HT1A receptor agonism, respectively, are involved in clozapine’s action, but the mechanism by which clozapine exerts this anti-cataleptic effect remains unknown.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/PL00004955
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