title: Chronic 5-HT2 receptor blockade with ritanserin does not reduce blood pressure in the spontaneously hypertensive rat.
abstract: Chronic oral treatment (8 weeks) with the selective 5-hydroxytryptamine2 (5-HT2)-receptor blocking agent, ritanserin, did not reduce blood pressure in the spontaneously hypertensive rat (SHR) during basal conditions or during stress (jet air). In pithed rats the pressor responses to 5-HT but not to phenylephrine or sympathetic stimulation of the sympathetic outflow were completely antagonized. These observations indirectly suggests that the 5-HT2-receptor blocking properties of the antihypertensive agent ketanserin cannot alone account for the antihypertensive effects in SHR that are observed during chronic treatment with this agent.
mesh_terms: D000818:Animals; D001794:Blood Pressure / Q000187:drug effects*; D003655:Decerebrate State / Q000503:physiopathology; D004305:Dose-Response Relationship, Drug; D004558:Electric Stimulation; D006339:Heart Rate / Q000187:drug effects; D006973:Hypertension / Q000503:physiopathology*; D007650:Ketanserin; D008297:Male; D010656:Phenylephrine / Q000494:pharmacology; D010880:Piperidines / Q000494:pharmacology*; D011224:Prazosin / Q000494:pharmacology; D051381:Rats; D011918:Rats, Inbred SHR; D011985:Receptors, Serotonin / Q000187:drug effects*; D016713:Ritanserin; D013997:Time Factors
chemical_list: D010880:Piperidines; D011985:Receptors, Serotonin; D016713:Ritanserin; D010656:Phenylephrine; D007650:Ketanserin; D011224:Prazosin