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- W199381657 abstract "Recently two local hormones, thromboxane A2 (TXA2) and prostacyclin (PGI2) have been discovered. These hormones are labile metabolites of arachidonic acid. TXA2 is generated by blood platelets, while PGI2 is produced by vascular endothelium. TXA2 is a potent vasoconstrictor. It also initiates the release reaction, followed by platelet aggregation. PGI2 is a vasodilator, especially potent in coronary circulation. It also inhibits platelet aggregation by virtue of stimulation of platelet adenyl cyclase. Common precursors for both hormones are cyclic endoperoxides PGG2 and PGH2, being formed by cyclooxygenation of arachidonic acid. This last enzymic reaction is more efficient in platelets than in vascular endothelium, and therefore the generation of PGI2 by vasuclar wall is accelerated by an interaction between platelets and endothelial cells. During this interaction platelets supply the endothelial PGI2 synthetase with their cyclic endoperoxides. The newly formed PGI2 repels the platelets from the intima. When PGI2 synthetase is irreversibly inactivated by low concentration of lipid peroxides, then the platelets are not rejected but stick to the endothelium, generate TXA2 and mature thrombi are formed. A balance between formation and release of PGI2, TXA2 and/or cyclic endoperoxides in circulation is of utmost importance for the control of intra-arterial thrombi formation and possibly plays a role in the pathogenesis of atherosclerosis." @default.
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- W199381657 date "1978-01-01" @default.
- W199381657 modified "2023-10-16" @default.
- W199381657 title "A possible role of thromboxane A2 (TXA2) and prostacyclin (PGI2) in circulation." @default.
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