title: The influence of prostaglandin E2 (PGE2) on the acetylcholine-initiated contractions of isolated gastric muscularis muscle of Bufo marinus.
abstract: Acetylcholine (ACh) (1.5 X 10(-5) M) elicited three different types of tonic and phasic contraction of muscularis muscle from different parts (cardiac, middle and pyloric) of the stomach of Bufo marinus. Prostaglandin E2 (PGE2) (10(-9)-10(-6) M) induced a concentration-dependent relaxation of tonic contractions elicited by ACh (1.5 x 10(-5) M) of strips from the cardiac part while potentiating the phasic contractions from the middle part of the stomach. PGE2 (10(-7) M) relaxed tonic contraction and potentiated phasic contraction concomitantly in preparations in which tonic and phasic contractions were elicited by ACh (1.5 x 10(-5) M). The effects of PGE2 on the preparation are related to the part of the stomach from where the strips are prepared and the muscle tone of the preparation.
authors.forename: C S
authors.initials: CS
authors.lastname: Tsai
authors.forename: R F
authors.initials: RF
authors.lastname: Ochillo
mesh_terms: D000109:Acetylcholine / Q000494:pharmacology*; D000818:Animals; D002024:Bufo marinus; D015232:Dinoprostone; D005260:Female; D066298:In Vitro Techniques; D008297:Male; D009119:Muscle Contraction / Q000187:drug effects; D009130:Muscle, Smooth / Q000187:drug effects*; D011458:Prostaglandins E / Q000494:pharmacology*
chemical_list: D011458:Prostaglandins E; D015232:Dinoprostone; D000109:Acetylcholine