title: Enprostil, a synthetic prostaglandin E2 analogue, inhibits meal-stimulated gastric acid secretion and gastrin release in patients with duodenal ulcer.
abstract: The effect of enprostil, a synthetic dehydro-prostaglandin E2, on meal-stimulated gastric acid secretion and gastrin release was studied in six patients with inactive duodenal ulcer disease. Each subject underwent seven tests in random order on separate days: placebo intragastrically and intraduodenally; enprostil 35 and 70 micrograms both intragastrically and intraduodenally; and ranitidine 150 mg intragastrically. After measuring basal gastric acid secretion and gastrin release, a liquid meal (500 ml, pH 5.5, 40 g protein, 30 g fat, 30 g carbohydrate, 550 Kcal, 768 mOsm) was given. Gastric acid secretion and gastrin release were measured over the next four hours. A second identical meal was instilled and both parameters were measured for an additional four hours. Thirty-five and 70 micrograms of enprostil administered intragastrically reduced total eight-hour gastric acid secretion by 58 percent and 82 percent, respectively (p less than 0.05). The 35 and 70 microgram doses administered intraduodenally decreased gastric acid secretion by 67 percent and 91 percent, respectively (p less than 0.05 compared with placebo). Ranitidine suppressed gastric acid secretion by 95 percent, which was similar to the suppression achieved with the 70 microgram dose of enprostil. The total meal-stimulated integrated gastrin response was significantly suppressed by both intragastric doses of enprostil and by the 70 microgram dose given intraduodenally (p less than 0.05). Compared with placebo, the 35 microgram intragastric and intraduodenal doses decreased the integrated gastrin response by 73 percent and 72 percent, respectively. The 70 microgram intragastric and intraduodenal doses of enprostil reduced the integrated gastrin response by 90 percent and 125 percent, respectively. Ranitidine did not alter the integrated gastrin response. It is concluded that enprostil significantly inhibited both meal-stimulated gastric acid secretion and gastrin release. The response to enprostil occurred in a dose-dependent manner and was similar regardless of the route of administration.
mesh_terms: D004381:Duodenal Ulcer / Q000097:blood / Q000188:drug therapy* / Q000503:physiopathology; D004435:Eating; D016620:Enprostil; D005215:Fasting; D005260:Female; D005744:Gastric Acid / Q000378:metabolism*; D005755:Gastrins / Q000097:blood*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011459:Prostaglandins E, Synthetic / Q000008:administration & dosage / Q000494:pharmacology / Q000627:therapeutic use*; D011899:Ranitidine / Q000008:administration & dosage / Q000494:pharmacology / Q000627:therapeutic use
chemical_list: D005755:Gastrins; D011459:Prostaglandins E, Synthetic; D011899:Ranitidine; D016620:Enprostil