Effects of spiroglumide, a gastrin receptor antagonist, on acid secretion in humans.

Background: A gastrin receptor antagonist, CR2194 (spiroglumide), was used to explore the physiological role of gastrin in regulating gastric acid secretion in humans.

Materials And Methods: The effect of CR2194 on inhibition of gastrin-stimulated acid output was evaluated in a four-period crossover study. Each subject received intravenous doses of 1, 2.5 or 7.5 mg kg-1 h-1 CR2194 or saline (control) followed by graded increasing doses of gastrin (6.4-800 pmol kg-1 h-1). Secondly, the effect of CR2194 on meal-stimulated intragastric acidity was evaluated by infusing either saline (control) or CR2194 (7.5 mg kg-1 h-1) before and after food ingestion.

Results: Acid secretion was dose-dependently inhibited by CR2194. With CR2194, acidity was significantly reduced in the pre-meal and post-prandial period (P < 0.01 and 0.002 respectively), and the integrated gastrin response was augmented to 8.0 +/- 1.4 ng mL-1 240 min compared with 1.5 +/- 0.8 ng mL-1 240 min in the control experiment (P < 0.01). Finally, acid secretion in response to sham feeding was significantly reduced: 15.9 +/- 0.9 mmol 90 min-1 in the control experiment compared with 2.8 +/- 0.9 mmol 90 min-1 during CR2194 infusion (P < 0.05).

Conclusion: Gastrin receptor blockade with CR2194 alters gastric acid secretion in response to food ingestion or to sham feeding. The results support a physiological role for gastrin in regulating acid secretion in humans.