title: Modulation of motor functions involving central dopaminergic system by L-histidine.
abstract: There exists a possibility of interactions of histaminergic system with other neurotransmitters and their receptors in the central nervous system. Experimental evidences suggest a possible inhibitory influence of histaminergic system on the dopaminergic system. To elucidate the possible interaction between the histaminergic and dopaminergic pathways, we devised a strategy to study their effects on locomotor function and stereotypy behaviour. We investigated the effect of L-histidine, the precursor of histamine, on apomorphine-induced stereotypy and perphenazine-induced catalepsy. Histidine antagonised apomorphine-induced stereotypy. This inhibitory effect of histidine was abolished by both H1- and H2-receptor antagonists, chlorpheniramine and cimetidine, respectively. Perphenazine-induced catalepsy was potentiated by histidine and this effect was inhibited by chlorpheniramine alone but not by cimetidine. These results confirm a possible histamine-dopamine interaction in the modulation of motor functions by the central nervous system.
authors.affiliation: Pharmacology Division, University Institute of Pharmaceutical Sciences, Panjab University, Chandigarh 160014, India.
authors.forename: V N
authors.initials: VN
authors.lastname: Paul
authors.forename: K
authors.initials: K
authors.lastname: Chopra
authors.forename: S K
authors.initials: SK
authors.lastname: Kulkarni
mesh_terms: D000818:Animals; D004298:Dopamine / Q000502:physiology*; D005260:Female; D006639:Histidine / Q000494:pharmacology*; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D009043:Motor Activity / Q000187:drug effects*; D051381:Rats; D017208:Rats, Wistar
chemical_list: D006639:Histidine; D004298:Dopamine