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Does jejunal feeding activate exocrine pancreatic secretion?
M K Vu1, P P van der Veek, M Frölich
1Department of Gastroenterology-Hepatology, Leiden University Medical Center, the Netherlands.
European Journal of Clinical Investigation
|December 3, 1999
Summary
Nutrient delivery to the distal jejunum minimally stimulates pancreatic secretion and gallbladder contraction, suggesting reduced activation of enteropancreatic reflexes. This finding is crucial for understanding digestive regulation.
Area of Science:
- Gastroenterology
- Digestive Physiology
Background:
- The upper small intestine plays a key role in stimulating pancreatic secretion after meals.
- Nutrient delivery further down the small intestine may lead to reduced pancreatic activation.
Purpose of the Study:
- To investigate the impact of nutrient delivery location in the jejunum on exocrine pancreatic secretion and gallbladder function.
- To determine if hormonal responses differ based on nutrient delivery site.
Main Methods:
- Eight healthy subjects underwent two experiments with nutrient feeding at the ligament of Treitz (proximal) or 60 cm distally (distal).
- Pancreatic enzyme and bilirubin outputs were measured, alongside gallbladder volume and gastrointestinal hormone levels.
Main Results:
- Proximal jejunal feeding significantly increased pancreatic enzyme output, while distal feeding did not.
- Distal jejunal feeding resulted in reduced bilirubin output and gallbladder contraction compared to proximal feeding.
- No significant differences in plasma levels of cholecystokinin (CCK), peptide YY (PYY), or neurotensin were observed.
Conclusions:
- Distal jejunal feeding does not stimulate exocrine pancreatic secretion but partially maintains gallbladder contraction.
- Observed effects are likely due to altered enteropancreatic reflexes rather than hormonal changes.