title: Thromboxane A2 analogue (U-46619) stimulates vascular PGI2 synthesis.
abstract: Since platelet release reaction products (e.g. serotonin, ADP) stimulate prostacyclin (PGI2) release in vitro, we have investigated whether thromboxane A2 (TXA2) also has a similar effect. An analogue, U-46619, was used for the experiments, since TXA2 is extremely unstable. U-46619 stimulated rat aortic PGI2 release; this stimulation was abolished by (a) EDTA and (b) verapamil. We conclude that TXA2 is a calcium-dependent stimulator of PGI2 release; this property may be relevant to the limitation of platelet aggregates in vivo and to vascular injury.
mesh_terms: D019796:15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic Acid; D000818:Animals; D004305:Dose-Response Relationship, Drug; D011464:Epoprostenol / Q000096:biosynthesis*; D066298:In Vitro Techniques; D008297:Male; D009131:Muscle, Smooth, Vascular / Q000378:metabolism*; D010974:Platelet Aggregation; D011450:Prostaglandin Endoperoxides, Synthetic / Q000494:pharmacology*; D051381:Rats; D011919:Rats, Inbred Strains; D013928:Thromboxane A2 / Q000031:analogs & derivatives
chemical_list: D011450:Prostaglandin Endoperoxides, Synthetic; D013928:Thromboxane A2; D019796:15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic Acid; D011464:Epoprostenol