The influence of gastrin on gastrointestinal function

Area of Science:

• Gastroenterology
• Developmental Biology
• Pharmacology

Background:

• Short bowel syndrome impairs intestinal function in children.
• Gastrin has shown potential trophic effects on the gastrointestinal tract.
• Investigating gastrin's role in enhancing small intestine epithelium function is crucial.

Purpose of the Study:

• To evaluate the influence of gastrin-17 on substrate absorption in fetal and mature rat small intestine.
• To compare the effects of systemic versus luminal administration of gastrin-17.
• To determine the optimal method for gastrin administration to improve intestinal function.

Main Methods:

• Utilized transplanted fetal small intestine, in situ mature small intestine, and isolated mature small intestine segments.
• Administered gastrin-17 (13.5 nmol/kg/d) or saline (control) for 14 days via osmotic pumps (systemic or luminal).
• Measured absorption of radiolabeled galactose and glycine to assess functional response.

Main Results:

• Transplanted fetal intestine showed a 250% increase in galactose and 130% increase in glycine absorption compared to controls.
• Systemic gastrin infusion in mature intestine yielded mild, non-significant increases in absorption.
• Luminal gastrin infusion resulted in a 4.54-fold increase in galactose and 4.79-fold increase in glycine absorption (P < .01).

Conclusions:

• Gastrin-17 significantly enhances substrate absorption in both fetal and mature rat small intestine.
• Luminal perfusion of gastrin-17 induced the most substantial improvement in absorption.
• Findings suggest gastrin's therapeutic potential for improving intestinal function, particularly in short bowel syndrome.