title: Comparative study of the effects of stimulation or blockade of beta-adrenoceptors on the head-twitches induced in mice by 5-hydroxytryptophan versus 5-methoxy-N, N-dimethyltryptamine.
abstract: This study aimed at comparing the effects of blockade or stimulation of beta-adrenoceptors on the head-twitch response induced in mice by direct (5-MeODMT) or indirect (5-HTP) activation of serotonergic receptors shows that: beta-agonists (clenbuterol and salbutamol) increased the 5-HTP-induced head-twitches and decreased the response to 5-MeODMT. beta-agonists (propranolol and penbutolol) reduced the head-twitches elicited by 5-HTP but enhanced those induced by 5-MeODMT. Under our experimental conditions, desipramine behaved like the beta-agonists studied. Prior intracerebroventricular injection of 5,7-DHT enhanced the response to 5-MeODMT but did not prevent the antagonism of clenbuterol against 5-MeODMT-induced head-twitches. These findings suggest that beta-receptors are in a position to regulate differentially serotonin transmission.
mesh_terms: D015116:5,7-Dihydroxytryptamine / Q000494:pharmacology; D006916:5-Hydroxytryptophan / Q000494:pharmacology*; D000318:Adrenergic beta-Agonists / Q000494:pharmacology*; D000319:Adrenergic beta-Antagonists / Q000494:pharmacology*; D000420:Albuterol / Q000494:pharmacology; D000818:Animals; D002976:Clenbuterol / Q000494:pharmacology; D003891:Desipramine / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D008297:Male; D008732:Methoxydimethyltryptamines / Q000494:pharmacology*; D051379:Mice; D009043:Motor Activity / Q000187:drug effects*; D012701:Serotonin / Q000031:analogs & derivatives*; D014202:Tremor / Q000139:chemically induced
chemical_list: D000318:Adrenergic beta-Agonists; D000319:Adrenergic beta-Antagonists; D008732:Methoxydimethyltryptamines; D015116:5,7-Dihydroxytryptamine; D012701:Serotonin; D006916:5-Hydroxytryptophan; D000420:Albuterol; D003891:Desipramine; D002976:Clenbuterol