Inhibition of acute platelet thrombosis formation in stenosed canine coronary arteries by specific serotonin 5HT2 receptor antagonist ritanserin

Cardiovascular Research
S TorrJ D Folts

Abstract

The aim of the study was to test the hypothesis that platelet serotonin 5HT2 receptors are important in the genesis of thrombosis in stenosed coronary arteries. The specific serotonin 5HT2 receptor antagonist, ritanserin was used as a pharmacological tool to examine the effect of removal of the participation of the 5HT2 receptors on thrombus growth, in a paired statistical design. The study involved 10 open chest anaesthetised dogs, with constrictors of critical diameter applied to the left circumflex coronary artery. Blood flow was monitored in the left circumflex coronary arteries, distal to the critical stenosis. Flow reductions occurred that have previously been shown to be caused by the accumulation of platelet thrombi. By embolising the thrombi, the process could be monitored cyclically (cyclic flow reductions). The specific serotonin 5HT2 receptor antagonist, ritanserin, abolished cyclic flow reductions at a dose of 0.5 mg.kg-1. There was no effect on blood pressure or heart rate on administration of ritanserin at any dose. The serotonin blockade by ritanserin also prevented the reestablishment of cyclic flow reductions by adrenaline infusion (0.4 micrograms.kg-1.min-1), but required ritanserin doses up to 1.5 mg.kg-1. E...Continue Reading

Citations

Feb 1, 1993·Cardiovascular Drugs and Therapy·P R BelcherM I Noble
Sep 1, 1993·Journal of the American College of Cardiology·E RaymenantsJ L Mehta
Nov 20, 2009·Journal of Thrombosis and Haemostasis : JTH·K PrzyklenkA D Michelson
Jan 1, 1994·International Journal of Cardiology·P R BelcherM I Noble
Mar 1, 2010·Expert Review of Clinical Pharmacology·Matthijs MoerlandJacobus Burggraaf
Aug 9, 2011·Journal of Cardiovascular Pharmacology·Matthijs MoerlandJacobus Burggraaf

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