title: Modulation of human platelet adenylate cyclase by prostacyclin (PGX).
abstract: Prostacyclin (PGX) (57)-9-deoxy-6,9alpha-epoxy-delta5-PGF1alpha has been found to be a potent stimulator of cAMP accumulation in platelets than PGE1. The prostacyclin stimulation of platelet cAMP accumulation can be antagonized by the prostaglandin endoperoxide PGH2, and a PGH2-induced platelet aggregation is antagonized by prostacyclin. A model of platelet homeostasis is proposed that suggests platelet aggregation is controlled by a balance between the adenylate cyclase stimulating activity of prostacyclin, and the cAMP lowering activity of PGH2.
mesh_terms: D000262:Adenylyl Cyclases / Q000097:blood*; D001792:Blood Platelets / Q000201:enzymology*; D000242:Cyclic AMP / Q000097:blood; D004305:Dose-Response Relationship, Drug; D004357:Drug Synergism; D006706:Homeostasis / Q000187:drug effects; D006801:Humans; D008861:Microsomes / Q000201:enzymology; D008954:Models, Biological; D010545:Peroxides / Q000494:pharmacology; D010974:Platelet Aggregation / Q000187:drug effects; D011458:Prostaglandins E / Q000494:pharmacology; D011460:Prostaglandins F / Q000494:pharmacology*
chemical_list: D010545:Peroxides; D011458:Prostaglandins E; D011460:Prostaglandins F; D000242:Cyclic AMP; D000262:Adenylyl Cyclases