title: Antagonism of thromboxane actions in the isolated perfused rat heart.
abstract: The effects of SQ-29,548, a novel thromboxane A2 (TxA2) receptor antagonist, were studied in the isolated perfused rat heart. SQ-29,548 at concentrations of 2.5 to 50 ng/ml antagonized the increase in coronary perfusion pressure (CPP) in response to the thromboxane agonist, 9,11-methanoepoxy PGH2. Increases in CPP induced by arginine vasopressin and leukotriene D4 were not altered by SQ-29,548. We conclude that SQ-29,548 is a very potent and specific TxA2 receptor antagonist in the coronary vasculature of the rat heart.
mesh_terms: D019796:15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic Acid; D000818:Animals; D001127:Arginine Vasopressin / Q000494:pharmacology; D019086:Bridged Bicyclo Compounds, Heterocyclic; D003331:Coronary Vessels / Q000187:drug effects / Q000502:physiology*; D005231:Fatty Acids, Unsaturated; D006834:Hydrazines / Q000494:pharmacology*; D008297:Male; D011312:Pressure; D011450:Prostaglandin Endoperoxides, Synthetic / Q000494:pharmacology; D051381:Rats; D011919:Rats, Inbred Strains; D011982:Receptors, Prostaglandin / Q000187:drug effects / Q000502:physiology; D017482:Receptors, Thromboxane; D013189:SRS-A / Q000494:pharmacology; D013928:Thromboxane A2 / Q000037:antagonists & inhibitors*; D014655:Vascular Resistance / Q000187:drug effects; D014661:Vasoconstriction / Q000187:drug effects
chemical_list: D019086:Bridged Bicyclo Compounds, Heterocyclic; D005231:Fatty Acids, Unsaturated; D006834:Hydrazines; D011450:Prostaglandin Endoperoxides, Synthetic; D011982:Receptors, Prostaglandin; D017482:Receptors, Thromboxane; D013189:SRS-A; D001127:Arginine Vasopressin; D013928:Thromboxane A2; D019796:15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic Acid; C045749:SQ 29548