title: Effects of cyclooxygenase-2 inhibitor on glucagon-induced delayed gastric emptying and gastric dysrhythmia in dogs.
abstract: The objective of this study was to investigate the effects of cyclooxygenase-2 (COX-2) inhibitor (celecoxib) on delayed gastric emptying and gastric dysrhythmia induced by glucagon. The study was performed in six healthy female dogs implanted with four pairs of gastric serosal electrodes, and a duodenal fistula for the assessment of gastric emptying. Each dog was studied in three randomized sessions: control, glucagon and COX-2 inhibitor (celecoxib). Gastric emptying was assessed every 15 min via a duodenal cannula by calculating the amount of collected phenol red which mixed with the test meal and gastric slow waves were recorded at the same time. We found that: (i) glucagon significantly and substantially decreased gastric emptying of liquids (P < 0.001, anova), increased blood glucose (BG) levels, and induced gastric dysrhythmias. The delayed gastric emptying was correlated with the BG level (R = -0.77, P < 0.001) and (ii) celecoxib improved glucagon-induced delayed gastric emptying at 30, 45, 60 and 75 min after feeding. Celecoxib did not blocked dysrhythmic action of glucagon (P > 0.05, anova). In conclusion, glucagon induces delayed gastric emptying partially via COX-2-derived prostaglandins. However, COX-2-derived prostaglandins are not involved in glucagon-evoked gastric dysrhythmia. Selective COX-2 inhibitors may provide a possible therapeutic option for diabetic gastroparesis.
authors.affiliation: Division of Gastroenterology, University of Texas Medical Branch, Galveston, TX, USA.
authors.forename: J
authors.initials: J
authors.lastname: Xu
authors.forename: J D Z
authors.initials: JD
authors.lastname: Chen
mesh_terms: D000818:Animals; D001786:Blood Glucose; D000068579:Celecoxib; D052246:Cyclooxygenase 2 Inhibitors / Q000494:pharmacology*; D004195:Disease Models, Animal; D004285:Dogs; D005260:Female; D005746:Gastric Emptying / Q000187:drug effects* / Q000502:physiology; D005769:Gastrointestinal Motility / Q000187:drug effects / Q000502:physiology; D018589:Gastroparesis / Q000139:chemically induced / Q000188:drug therapy* / Q000503:physiopathology; D005934:Glucagon / Q000494:pharmacology*; D011706:Pyloric Antrum / Q000187:drug effects / Q000502:physiology; D011720:Pyrazoles / Q000494:pharmacology*; D013449:Sulfonamides / Q000494:pharmacology*
chemical_list: D001786:Blood Glucose; D052246:Cyclooxygenase 2 Inhibitors; D011720:Pyrazoles; D013449:Sulfonamides; D005934:Glucagon; D000068579:Celecoxib