title: Influence of (-)-sulpiride and YM-09151-2 on stereotyped behavior in chicks and catalepsy in rats.
abstract: In this paper, the effects of three antipsychotic agents using the avian species laboratory model are described. d-Amphetamine (2-5 mg/kg, s.c.) dose-dependently antagonized catalepsy induced by haloperidol (0.25 mg/kg, i.p.), YM-09151-2 (0.02-0.04 mg/kg, i.p.) and (-)-sulpiride (20-40 mg/kg, i.p.) in rats. (-)-Sulpiride (10-40 mg/kg, i.p.) dose-dependently antagonized apomorphine (0.125 mg/kg, s.c.)-induced stereotyped behavior in young chicks. Similarly, YM-09151-2 (0.04 mg/kg, i.p.) antagonized apomorphine (0.125 mg/kg, s.c.)-induced stereotyped behavior in young chicks. (-)-Sulpiride (40 mg/kg, i.p.) significantly antagonized apomorphine (0.25 mg/kg, s.c.)-induced stereotyped behavior in 6 week old chicks. Parachlorophenylalanine (PCPA, 300 mg/kg, i.p.) significantly reduced the intensity of stereotyped behavior induced by apomorphine (0.125 mg/kg, s.c.) in young chicks. However, (-)-sulpiride (40 mg/kg, i.p.) did not significantly influence the effect of PCPA on apomorphine-induced stereotyped behavior. Similarly, catalepsy induced by (-)-sulpiride (40 mg/kg, i.p.), haloperidol (0.25 mg/kg, i.p.) and YM-09151-2 (0.04 mg/kg, i.p.) in male rats was profoundly suppressed by PCPA (300 mg/kg, i.p.). The present results indicate that apomorphine-induced stereotyped pecking in young (4-6 day old) chicks may serve as a suitable laboratory model for testing potential antipsychotic drugs. In addition, the data indicates that endogenous 5-hydroxytryptamine mechanisms may be involved in the genesis of drug-induced catalepsy in rats.
mesh_terms: D000375:Aging / Q000502:physiology; D000818:Animals; D014150:Antipsychotic Agents / Q000494:pharmacology*; D001549:Benzamides / Q000494:pharmacology*; D002375:Catalepsy / Q000139:chemically induced*; D002645:Chickens; D003913:Dextroamphetamine / Q000494:pharmacology; D010134:Fenclonine / Q000494:pharmacology; D006220:Haloperidol / Q000494:pharmacology; D008297:Male; D051381:Rats; D011919:Rats, Inbred Strains; D013237:Stereoisomerism; D013239:Stereotyped Behavior / Q000187:drug effects*; D013469:Sulpiride / Q000494:pharmacology*
chemical_list: D014150:Antipsychotic Agents; D001549:Benzamides; D013469:Sulpiride; D006220:Haloperidol; C030265:nemonapride; D010134:Fenclonine; D003913:Dextroamphetamine