title: Biological activity and anti-prostaglandin effects of prostaglandin analogue, ent-11-epi-15-epi PGE2 methyl ester.
abstract: The biological activity and anti-prostaglandin property of the prostaglandin analogue, ent-11-epi-15-epi PGE2 methyl ester, were studied on isolated guinea pig ileum. Ent-11-epi-15-epi PGE2 methyl ester contracted guinea pig ileum and produced a concentration-response curve parallel to that of PGE2. However, the former exhibited a lower maximal effect than PGE2. At concentrations greater than 10(-6)M, ent-11-epi-15-epi PGE2 methyl ester selectively antagonized contractile actions of PGE2 and PGE2 alpha without affecting contractions induced by acetylcholine. These observations suggest that the PG analogue acted like a competitive antagonist to PGE2 and PGF2 alpha on guinea pig ileum in vitro.
authors.affiliation: Department of Obstetrics and Gynaecology, National University of Singapore.
authors.forename: P G
authors.initials: PG
authors.lastname: Adaikan
authors.forename: L C
authors.initials: LC
authors.lastname: Lau
authors.forename: Y T
authors.initials: YT
authors.lastname: Chua
authors.forename: S S
authors.initials: SS
authors.lastname: Ratnam
mesh_terms: D000818:Animals; D015237:Dinoprost / Q000037:antagonists & inhibitors; D015232:Dinoprostone / Q000031:analogs & derivatives* / Q000037:antagonists & inhibitors* / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D005260:Female; D006168:Guinea Pigs; D007082:Ileum / Q000187:drug effects; D008297:Male; D009130:Muscle, Smooth / Q000187:drug effects; D013268:Stimulation, Chemical
chemical_list: C041324:prostaglandin E2 methyl ester; D015237:Dinoprost; D015232:Dinoprostone