Interrelationships between prostacyclin and thromboxane A2
Home of Kyle J. Norton for The Better of Living & Living Health Prostacyclin (or PGI2), also known as known as eicosanoids, a member of the family prostaglandins as a metabolite of arachidonic acid, inhibits platelet aggregation, and dilates blood vessels and is released by healthy endothelial cells and performs its function through a paracrine signaling cascade that involves G protein-coupled receptors on nearby platelets and endothelial cells(a).
Interrelationships between prostacyclin and thromboxane A2
Prostacyclin is a product of arachidonic acid metabolism generated by the vessel wall of all mammalian species studied including man. According to the study by Moncada S, Vane JR. ,prostacyclin is a potent vasodilator and the most potent inhibitor of platelet aggregation. It inhibits platelet aggregationand can also be a circulating hormone constantly released by the pulmonary circulation. In contrast to the vessel wall, in blood platelets arachidonic acid is converted by the enzyme thromboxane synthetase to a potent vasoconstrictor and proaggregating substance, thromboxane A2. Therefore arachidonic acid is metabolized in the vessel wall and the platelets to potent substances with opposing biological activities. The balance between the activities of these substances is important in the homeostatic interaction of the platelets and the vessel wall. The different ways of interfering with this balance and its impact in the development of thrombosis and atherosclerosis(11).
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Sources
(a) http://en.wikipedia.org/wiki/Prostacyclin
(11) http://www.ncbi.nlm.nih.gov/pubmed/6258879 http://medicaladvisorjournals.blogspot.com
Source: http://medicaladvisorjournals.blogspot.com/2013/05/interrelationships-between-prostacyclin.html
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