title: Role of N-methyl-D-aspartate (NMDA) receptors in experimental catalepsy in rats.
abstract: N-methyl-D-aspartic acid (NMDA; 40 mg/kg, i.p.) did not elicit catalepsy, but it potentiated the cataleptic effect of haloperidol and GABAB receptor agonist, baclofen. MK-801 (0.2 mg/kg, i.p.), NMDA-receptor antagonist, reversed haloperidol- but not baclofen-induced catalepsy. MK-801 also potentiated the anticataleptic effect of scopolamine and bromocriptine against haloperidol-induced catalepsy. Dihydropyridine (DHP) calcium-channel antagonists such as nimodipine and nitrendipine (10 mg/kg, i.p.), reversed the anticataleptic effect of MK-801, and potentiated the cataleptic effect of haloperidol, as well as baclofen. These observations indicate the involvement of NMDA receptors in catalepsy, and suggest a potential clinical implication of NMDA-receptor antagonists in Parkinson's disease.
authors.affiliation: Department of Pharmacology, University of Texas Health Science Center, San Antonio 78284-7764.
authors.forename: A K
authors.initials: AK
authors.lastname: Mehta
authors.forename: M K
authors.initials: MK
authors.lastname: Ticku
mesh_terms: D000818:Animals; D001224:Aspartic Acid / Q000031:analogs & derivatives / Q000494:pharmacology; D001418:Baclofen / Q000494:pharmacology; D001971:Bromocriptine / Q000494:pharmacology; D002375:Catalepsy / Q000378:metabolism*; D003986:Dibenzocycloheptenes / Q000494:pharmacology; D016291:Dizocilpine Maleate; D004347:Drug Interactions; D006220:Haloperidol / Q000494:pharmacology; D008297:Male; D016202:N-Methylaspartate; D009553:Nimodipine / Q000494:pharmacology; D009568:Nitrendipine / Q000494:pharmacology; D051381:Rats; D011919:Rats, Inbred Strains; D016194:Receptors, N-Methyl-D-Aspartate; D017981:Receptors, Neurotransmitter / Q000037:antagonists & inhibitors / Q000502:physiology*; D012601:Scopolamine / Q000494:pharmacology
chemical_list: D003986:Dibenzocycloheptenes; D016194:Receptors, N-Methyl-D-Aspartate; D017981:Receptors, Neurotransmitter; D001224:Aspartic Acid; D001971:Bromocriptine; D009553:Nimodipine; D016202:N-Methylaspartate; D016291:Dizocilpine Maleate; D009568:Nitrendipine; D012601:Scopolamine; D001418:Baclofen; D006220:Haloperidol