Protease activated receptors modulate aortic vascular tone

• Published in: International journal of cardiology Vol. 53; pp. S75 - S80
• Main Authors: Magazine, Harold I., King, Jonathan M., Srivastava, Kamal D.
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier Ireland Ltd 26.04.1996
• Subjects: Animals; Aorta, Thoracic - physiology; Endothelin; Male; Muscle, Smooth, Vascular - drug effects; Nitric oxide; Nitric Oxide - metabolism; Oligopeptides - pharmacology; Peptide Fragments - pharmacology; Protease activated receptors; Rats; Rats, Sprague-Dawley; Receptor, Endothelin A; Receptor, PAR-2; Receptors, Cell Surface - drug effects; Receptors, Cell Surface - physiology; Receptors, Endothelin - physiology; Receptors, Thrombin - drug effects; Receptors, Thrombin - physiology; Thrombin receptors; Vascular tone; Vasodilation - physiology; Thrombin receptors; Protease activated receptors; Endothelin; Vascular tone; Nitric oxide
• ISSN: 0167-5273; 1874-1754
• DOI: 10.1016/0167-5273(96)02569-7

The effect of agonists of the known protease activated receptors (PAR), the thrombin and the PAR-2 receptors, on vasoactive mediator release and vascular tone were studied using rings of rat aorta. Stimulation of aortic rings with the thrombin receptor agonist, Trap-14, or the PAR-2 agonist, SLIGRL, resulted in a rapid release of nitric oxide. Trap-14 and SLIGRL-induced nitric oxide release was reduced by pre-treatment with BQ-788, an ET B endothelin receptor-specific antagonist. Consistent with a role for endothelin-1 receptor activation in Trap-14 and SLIGRL-induced nitric oxide release, endothelin-1 levels were increased significantly following 5 min treatment of aortic rings with Trap-14 or SLIGRL. Cumulative addition of Trap-14 to aortic rings denuded of endothelium resulted in dose-dependent contraction with an EC 50 value of 23 ± 5 μM, whereas SLIGRL addition failed to induce aortic contraction. These data suggest that the known protease activated receptors are functionally coupled to nitric oxide release. In addition, the thrombin receptor appears to modulate both vasodilator and contractile responses, whereas the PAR-2 receptor is linked only to vasodilation.