Gastrin release by bombesin in the dog

Area of Science:

• Gastroenterology
• Endocrinology
• Pharmacology

Background:

• Gastrin is a key hormone regulating gastric acid secretion.
• Bombesin is a peptide with known physiological effects, including potential impacts on the gastrointestinal system.

Purpose of the Study:

• To investigate the effect of bombesin on gastrin release and gastric acid secretion in dogs.
• To explore the mechanisms underlying bombesin-induced gastrin release and acid secretion.

Main Methods:

• Intravenous infusion of bombesin in intact and gastric-fistulated dogs.
• Administration of atropine and metiamide to assess their effects on bombesin response.
• Stomach acidification to evaluate its influence on bombesin's actions.
• Antrectomy to determine the role of the antrum in bombesin's effects.

Main Results:

• Bombesin infusion dose-dependently increased plasma gastrin levels and stimulated gastric acid secretion.
• Atropine and metiamide inhibited acid secretion but not gastrin release.
• Stomach acidification reduced or delayed the response to bombesin.
• Antrectomy significantly diminished bombesin-induced gastrin release and acid secretion.

Conclusions:

• Bombesin is a potent stimulator of gastrin release from the canine antral mucosa.
• Bombesin's effects on gastric acid secretion are mediated, at least in part, by gastrin release.
• The study discusses potential confounding factors like renal effects of bombesin.