Paul, V NChopra, KKulkarni, S K2009-05-282009-05-282000-10-28Paul VN, Chopra K, Kulkarni SK. Modulation of motor functions involving central dopaminergic system by L-histidine. Indian Journal of Experimental Biology. 2000 Oct; 38(10): 988-93http://imsear.searo.who.int/handle/123456789/60965There 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.engAnimalsDopamine --physiologyFemaleHistidine --pharmacologyMaleMiceMice, Inbred BALB CMotor Activity --drug effectsRatsRats, WistarJournal Article