Cholinergic stimulation of human pancreatic secretion

Area of Science:

• Gastroenterology
• Pharmacology

Background:

• Cholinergic pathways play a role in regulating gastrointestinal functions.
• Understanding the specific effects of cholinergic agents on pancreatic secretion is crucial for clinical applications.

Purpose of the Study:

• To investigate the impact of bethanechol on pancreatic secretion in healthy volunteers.
• To examine the influence of bethanechol on plasma levels of pancreatic polypeptide and somatostatin.
• To assess bethanechol's effect on secretin and cholecystokinin (CCK)-stimulated pancreatic secretion.

Main Methods:

• Administration of graded doses of bethanechol to six healthy volunteers.
• Measurement of pancreatic secretion (amylase and bicarbonate).
• Quantification of plasma pancreatic polypeptide and somatostatin levels.
• Evaluation of bethanechol's effect on secretin-CCK-stimulated pancreatic secretion.

Main Results:

• Bethanechol induced moderate amylase secretion and weak bicarbonate secretion.
• No significant alterations in plasma pancreatic polypeptide or somatostatin were observed.
• Bethanechol potentiated the pancreatic response to secretin and CCK stimulation.

Conclusions:

• These findings support the existence of a cholinergic pathway in regulating pancreatic secretion in humans.
• Bethanechol demonstrates a moderate stimulatory effect on pancreatic exocrine function.