title: Cardiovascular effects of Hyptis fruticosa essential oil in rats.
abstract: In non-anesthetized normotensive rats, Hyptis fruticosa essential oil (HFEO, 5, 10, 20 and 40 mg/kg; i.v.) induced hypotension associated with tachycardia. In intact and isolated rings of rat superior mesenteric artery (control), HFEO (1-1000 microg/ml, n=6, cumulatively) induced concentration-dependent relaxations of tonus induced by 10 microM phenylephrine (Phe) (pD(2)=2.6+/-0.27; E(max)=64+/-8.3%). In denuded endothelium pre-contracted rings with Phe or K(+)-depolarizing solution (80 mM), the concentration-response curves to HFEO were not shifted (pD(2)=2.3+/-0.25 and 2.3+/-0.28, respectively), but their maximal responses were significantly (P<0.05 vs control) increased (E(max)=122.3+/-18.2% and 92+/-3.6%, respectively). HFEO was also capable of antagonizing the concentration-response curves to CaCl(2) (3 microM-30 mM) in a dose-dependent manner.
authors.affiliation: Laboratório de Farmacologia Cardiovascular, Universidade Federal de Sergipe, Av. Marechal Rondon, S/N, Rosa Elze, CEP: 49100-000, São Cristóvão, SE, Brazil. marcio@infonet.com.br
authors.forename: M R V
authors.initials: MR
authors.lastname: Santos
authors.forename: A A
authors.initials: AA
authors.lastname: Carvalho
authors.forename: I A
authors.initials: IA
authors.lastname: Medeiros
authors.forename: P B
authors.initials: PB
authors.lastname: Alves
authors.forename: M
authors.initials: M
authors.lastname: Marchioro
authors.forename: A R
authors.initials: AR
authors.lastname: Antoniolli
mesh_terms: D000818:Animals; D000959:Antihypertensive Agents / Q000008:administration & dosage / Q000494:pharmacology* / Q000627:therapeutic use; D001794:Blood Pressure / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D006339:Heart Rate / Q000187:drug effects*; D006973:Hypertension / Q000188:drug therapy; D031331:Hyptis; D007275:Injections, Intravenous; D008297:Male; D008638:Mesenteric Arteries / Q000187:drug effects; D009126:Muscle Relaxation / Q000187:drug effects; D009130:Muscle, Smooth / Q000187:drug effects; D008517:Phytotherapy; D010938:Plant Oils / Q000008:administration & dosage / Q000494:pharmacology* / Q000627:therapeutic use; D051381:Rats; D017208:Rats, Wistar
chemical_list: D000959:Antihypertensive Agents; D010938:Plant Oils