title: Pharmacological analysis of the cardiac effects of 5-HT and some 5-HT receptor agonists in the pithed rat.
abstract: A pharmacological analysis of the effects of 5-HT on heart rate has been performed in the pithed rat. 5-HT induced a dose-dependent increase in heart rate whereas 5-HT1 receptor agonists--8-hydroxy-2-(di-n-propylamino)tetralin (8-OH-DPAT), 5-methoxy-N,N-dimethyl-tryptamine (5-MeODMT), 5-methoxy 3-(1,2,3,6-tetrahydro-4-piridinyl) 1H indole (RU 24969) and 1-(m-trifluoromethylphenyl)-piperazine (TFMPP)--failed to increase heart rate. The increase in heart rate induced by the selective 5-HT2 receptor agonist 1-(2,5-dimethoxy-4-iodo-phenyl)-2-aminopropane (DOI) was not significant. The dose-response curve to 5-HT for its tachycardic effects was shifted two-fold to the right by ketanserin and LY 53857 and nine-fold to the right by methiothepin. The effects of high doses of 5-HT (higher than 100 micrograms/kg iv) were antagonized by methiothepin, (-)propranolol, 2-(2-[4(O-methoxyphenyl)-piperazine-1-yl]-ethyl)4,4-dimethyl-1,3 (2H-4H) isoquinoline-dione (AR-C 239) and by pretreatment with reserpine. The 5-HT1 receptor antagonists, pindolol and spiroxatrine, the 5-HT3 receptor antagonist MDL 72222 and the alpha 2-adrenoceptor blocking agent idazoxan failed to antagonize the tachycardia induced by 5-HT. It is concluded that in the pithed rat, the tachycardia induced by 5-HT remained unexplained (implication of 5-HT2 receptors probably different from the classical vascular 5-HT2 receptor, or implication of 5-HT1C receptors?). Moreover, at high doses (higher than 100 micrograms/kg iv), 5-HT may increase heart rate by releasing catecholamines.
authors.affiliation: Inserm U337, Faculté de Médecine Broussais Hôtel-Dieu, Paris, France.
authors.forename: H
authors.initials: H
authors.lastname: Dabiré
authors.forename: K
authors.initials: K
authors.lastname: Chaouche-Teyara
authors.forename: C
authors.initials: C
authors.lastname: Cherqui
authors.forename: B
authors.initials: B
authors.lastname: Fournier
authors.forename: H
authors.initials: H
authors.lastname: Schmitt
mesh_terms: D000818:Animals; D003655:Decerebrate State / Q000503:physiopathology; D004305:Dose-Response Relationship, Drug; D006339:Heart Rate / Q000187:drug effects*; D008297:Male; D051381:Rats; D017208:Rats, Wistar; D011942:Receptors, Adrenergic, alpha / Q000187:drug effects; D011985:Receptors, Serotonin / Q000187:drug effects; D012701:Serotonin / Q000494:pharmacology*; D012702:Serotonin Antagonists / Q000494:pharmacology; D017366:Serotonin Receptor Agonists / Q000494:pharmacology*
chemical_list: D011942:Receptors, Adrenergic, alpha; D011985:Receptors, Serotonin; D012702:Serotonin Antagonists; D017366:Serotonin Receptor Agonists; D012701:Serotonin