title: Vascular smooth muscle activity of 7-oxa-13-prostynoic acid.
abstract: The effects of 7-oxa-13-prostynoic acid (7-OPA), alone and as an antagonist of PGE2 and PGF2alpha, were investigaed in isolated rabbit aortic and canine renal arterial (diameter approximentaly 0.5 mm) strips. 7-OPA caused contractions in both preparations; threshold concentrations were 3- to 10-fold higher than the PGs and maximum contraction was 50-60%. In concentrations of 10(-5) M, 7-OPA inhibited contractions by PGF2alpha and PGE2. The same concentration of 7-OPA did not inhibit norepinephrine-induced contractions. These data indicate that 7-OPA is a partial agonist of PG receptors and produces its antagonism of PGE2 and PGF2alpha by that mechanism.
mesh_terms: D000818:Animals; D001011:Aorta / Q000187:drug effects; D001158:Arteries / Q000187:drug effects*; D005231:Fatty Acids, Unsaturated / Q000494:pharmacology*; D009119:Muscle Contraction / Q000187:drug effects*; D009130:Muscle, Smooth / Q000187:drug effects*; D009638:Norepinephrine / Q000494:pharmacology; D011459:Prostaglandins E, Synthetic / Q000037:antagonists & inhibitors / Q000494:pharmacology*; D011461:Prostaglandins F, Synthetic / Q000037:antagonists & inhibitors / Q000494:pharmacology*; D011817:Rabbits; D011982:Receptors, Prostaglandin / Q000187:drug effects; D012077:Renal Artery / Q000187:drug effects
chemical_list: D005231:Fatty Acids, Unsaturated; D011459:Prostaglandins E, Synthetic; D011461:Prostaglandins F, Synthetic; D011982:Receptors, Prostaglandin; D009638:Norepinephrine