Canine pancreatic response to intestinally perfused oligopeptides

Area of Science:

• Gastroenterology
• Digestive Physiology
• Peptide Signaling

Background:

• Previous studies suggested luminal peptides stimulate pancreatic secretion but used crude mixtures.
• The size and composition of these stimulating peptides remained unclear.

Purpose of the Study:

• To investigate the role of specific oligopeptides in stimulating pancreatic secretion.
• To clarify which oligopeptides act as stimulants for the pancreas.

Main Methods:

• Experiments were conducted in dogs with chronic gastric and pancreatic fistulas.
• Commercially synthesized oligopeptides were perfused into the proximal bowel.
• Pancreatic protein and bicarbonate outputs were measured under controlled conditions.

Main Results:

• Glycylphenylalanine, glycyltryptophan, and phenylalanylglycine stimulated pancreatic secretion.
• Dipeptides like glycylphenylalanine showed stimulatory effects.
• Di- and triglycine did not significantly affect pancreatic outputs.

Conclusions:

• Specific oligopeptides, particularly certain dipeptides, are stimulants of pancreatic secretion.
• Not all oligopeptides present in the gut lumen possess stimulatory activity.