title: The effect of edothelium on the response to propofol on bovine coronary artery rings.
abstract: In this study, the effect of propofol on isolated bovine coronary artery tone was studied in artery rings precontracted with PGF2a. Propofol, in concentrations of 10-6-10-5 M did not change vascular smooth muscle tone, but at high concentrations (10-4-10-1 M) produced relaxation in rings with intact endothelium. In rings denuded of endothelium or treated with methylene blue, propofol produced relaxation at 10-3-10-1 M concentrations, but there was a significant decrease in relaxation compared to endothelium intact rings. In the presence of a calcium agonist (Bay K 8644; 10-5 M), propofol produced constriction in rings denuded of endothelium. These results suggest that high concentrations of propofol may have vasorelaxant effect on bovine coronary artery and that these effects may be due to actions on the endothelium and mediated by calcium channels.
authors.affiliation: Department of Pharmacology, Faculty of Medicine, Karadeniz Technical University, Trabzon.
authors.forename: N
authors.initials: N
authors.lastname: Gacar
authors.forename: S
authors.initials: S
authors.lastname: Gök
authors.forename: N I
authors.initials: NI
authors.lastname: Kalyoncu
authors.forename: I
authors.initials: I
authors.lastname: Ozen
authors.forename: N
authors.initials: N
authors.lastname: Soykan
authors.forename: G
authors.initials: G
authors.lastname: Aktürk
mesh_terms: D001498:3-Pyridinecarboxylic acid, 1,4-dihydro-2,6-dimethyl-5-nitro-4-(2-(trifluoromethyl)phenyl)-, Methyl ester / Q000494:pharmacology; D018686:Anesthetics, Intravenous / Q000494:pharmacology*; D000818:Animals; D002417:Cattle; D003331:Coronary Vessels / Q000187:drug effects* / Q000502:physiology; D004730:Endothelium, Vascular / Q000502:physiology*; D066298:In Vitro Techniques; D009569:Nitric Oxide / Q000502:physiology; D015742:Propofol / Q000494:pharmacology*; D014664:Vasodilation / Q000187:drug effects
chemical_list: D018686:Anesthetics, Intravenous; D009569:Nitric Oxide; D001498:3-Pyridinecarboxylic acid, 1,4-dihydro-2,6-dimethyl-5-nitro-4-(2-(trifluoromethyl)phenyl)-, Methyl ester; D015742:Propofol