Description_x000D_ Application_x000D_ Prostaglandin E1 has been used:_x000D_ • as a platelet inhibitor to analyse its effect on autophagy_x000D_ • in platelet adhesion assay_x000D_ • to investigate its effect on cAMP production in thyroid glands of normal and growth-retarded mouse in vitro._x000D_ Biochem/physiol Actions_x000D_ Prostaglandin E1 (PGE1) is a hormone synthesized from dihomo-γ-linolenic acid (DGLA) by the action of enzyme prostaglandin synthase. It is a vasodilator and activates adenylate cyclase. It is majorly present in human semen and is a potent platelet aggregation inhibitor. PGE1 infusions is effective in treating limb ischemia and peripheral vascular disease. It is unstable and is hydrolyzed to PGA1 in the lungs. Nanoparticle encapsulation of PGE1 is essential for its delivery at the vascular injury site. It elicits vasodilator effects on the retinal artery and vein in central retinal artery occlusion (CRAO). PGE1 and its synthetic analog misoprostol interact with E-prostanoid receptor 4 (EP4) and elicits protection in chronic myelogenous leukemia (CML).