title: Prostacyclin and thromboxane formation in human umbilical arteries following stimulation with vasoactive autacoids.
abstract: The formation of prostacyclin (PGI2) and thromboxane A2 (TXA2) (measured as the stable metabolites 6-keto-PGF1 alpha and TXB2) during stimulation with vasoactive autacoids was registered in human umbilical arteries perfused in vitro. Responses were registered within 3-4 minutes after addition of the substances. Both angiotensin I and II were found to increase the formation of PGI2 while depressing that of TXA2. Serotonin increased the formation of TXA2 but not that of PGI2. Both PGE2 and PGF2 alpha stimulated the PGI2 formation. The TXA2 mimetic U46619, increased PGI2 production, whereas PGI2 slightly increased the formation of TXA2. All responses were found to be completely inhibited by indomethacin.
mesh_terms: D019796:15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic Acid; D015121:6-Ketoprostaglandin F1 alpha / Q000096:biosynthesis; D000809:Angiotensins / Q000494:pharmacology*; D002216:Captopril / Q000494:pharmacology; D015237:Dinoprost; D015232:Dinoprostone; D011464:Epoprostenol / Q000096:biosynthesis*; D006801:Humans; D066298:In Vitro Techniques; D007213:Indomethacin / Q000494:pharmacology; D008784:Methysergide / Q000494:pharmacology; D010477:Perfusion; D011450:Prostaglandin Endoperoxides, Synthetic / Q000494:pharmacology; D011453:Prostaglandins / Q000494:pharmacology*; D011458:Prostaglandins E / Q000494:pharmacology; D011460:Prostaglandins F / Q000494:pharmacology; D011863:Radioimmunoassay; D012504:Saralasin / Q000494:pharmacology; D012701:Serotonin / Q000494:pharmacology*; D013928:Thromboxane A2 / Q000096:biosynthesis*; D013929:Thromboxane B2 / Q000096:biosynthesis; D014469:Umbilical Arteries / Q000378:metabolism*
chemical_list: D000809:Angiotensins; D011450:Prostaglandin Endoperoxides, Synthetic; D011453:Prostaglandins; D011458:Prostaglandins E; D011460:Prostaglandins F; D012701:Serotonin; D013929:Thromboxane B2; D013928:Thromboxane A2; D015121:6-Ketoprostaglandin F1 alpha; D019796:15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic Acid; D002216:Captopril; D015237:Dinoprost; D011464:Epoprostenol; D012504:Saralasin; D015232:Dinoprostone; D007213:Indomethacin; D008784:Methysergide