title: Effects of 7-oxa-13-prostynoic acid (7-OPyA) and prostaglandin E1 methyl ester on canine gastric secretion.
abstract: The compound 7-OPyA has been reported to antagonize smooth muscle stimulatory effects of some prostaglandins (PG's) in vitro. The in vivo PG antagonist activity of 7-OPyA has not been adequately diarrhea in mice. We studied the effects of this compound on PGE1. Secretion was stimulated by continuous intravenous infusion of histamine. At the steady-state plateau of gastric secretion, PGE1 methyl ester (PGE1 ME) or PGE1 ME and 7-OPyA were simultaneously infused intravenously. The extent of gastric secretory inhibition afforded by PGE1 ME alone or in the presence of 7-OPyA was assessed. 7-OPyA did not modify PGE1 ME gastric antisecretory actions when administered at doses 20-50 times greater than the dose of PGE1 ME. These results suggest that the prostaglandin antagonist effects of 7-OPyA show organ specificity, which may be of clinical importance.
mesh_terms: D000818:Animals; D055598:Chemical Phenomena; D002621:Chemistry; D004285:Dogs; D005231:Fatty Acids, Unsaturated / Q000008:administration & dosage / Q000494:pharmacology*; D005260:Female; D005750:Gastric Juice / Q000378:metabolism*; D009130:Muscle, Smooth / Q000187:drug effects; D011448:Prostaglandin Antagonists / Q000494:pharmacology; D011458:Prostaglandins E / Q000494:pharmacology*; D012636:Secretory Rate / Q000187:drug effects; D013997:Time Factors
chemical_list: D005231:Fatty Acids, Unsaturated; D011448:Prostaglandin Antagonists; D011458:Prostaglandins E