Pharmacological Actions of Prostaglandins, Prostacycline, Thromboxane & Leukotrienes (Autacoids - 7) 

Pharmacological Actions of Prostaglandins, Prostacycline, Thromboxane & Leukotrienes (Autacoids - 7) by Dr. Shikha Parmar
The prostaglandins (PG) are a group of physiologically active lipid compounds called eicosanoids having diverse hormone-like effects in animals. Prostaglandins have been found in almost every tissue in humans and other animals. They are derived enzymatically from the fatty acid arachidonic acid.
Prostaglandins are powerful locally acting vasodilators and inhibit the aggregation of blood platelets. Through their role in vasodilation, prostaglandins are also involved in inflammation. They are synthesized in the walls of blood vessels and serve the physiological function of preventing needless clot formation, as well as regulating the contraction of smooth muscle tissue. Conversely, thromboxanes (produced by platelet cells) are vasoconstrictors and facilitate platelet aggregation. Their name comes from their role in clot formation (thrombosis).
Description Source: Wikipedia