title: Bioassay of prostaglandins in the presence of high concentrations of catecholamines.
abstract: A column filled with activated aluminium oxide is incorporated into the bioassay system of Vane in which a rat stomach strip, a chick rectum and a rat colon are superfused in cascade. The absorbance of catecholamines by the column and the passage of prostaglandins through the column are almost 100%. This modification of Vane's technique enables PGE1, PGE2, PGF2, F2a to be estimated at concentrations as low as 0-5--1-0 ng/ml in the presence of catecholamines at a concentration as high as 50 ng/ml. Using this method we have demonstrated the release of small amounts (2 ng/ml) of an endogenous PGE-like substance from rabbit ear vessels contracted by an infusion of norepinephrine (500 ng/ml/min).
mesh_terms: D000535:Aluminum; D000818:Animals; D001681:Biological Assay; D002395:Catecholamines / Q000032:analysis*; D002645:Chickens; D003106:Colon / Q000187:drug effects; D066298:In Vitro Techniques; D008722:Methods; D010087:Oxides; D011458:Prostaglandins E / Q000032:analysis* / Q000494:pharmacology; D011460:Prostaglandins F / Q000032:analysis* / Q000494:pharmacology; D051381:Rats; D012007:Rectum / Q000187:drug effects; D013270:Stomach / Q000187:drug effects
chemical_list: D002395:Catecholamines; D010087:Oxides; D011458:Prostaglandins E; D011460:Prostaglandins F; D000535:Aluminum