Interleukin-11 enhances small intestine absorptive function and mucosal mass after intestinal adaptation

Area of Science:

• Gastroenterology
• Regenerative Medicine
• Pharmacology

Background:

• Massive small bowel resection (MSBR) leads to impaired nutrient absorption.
• Interleukin-11 (IL-11) has shown potential in increasing mucosal mass post-MSBR.
• The correlation between increased mucosal mass and enhanced absorptive function requires further investigation.

Purpose of the Study:

• To investigate the dose-dependent effects of systemic Interleukin-11 (IL-11) administration on small intestine absorptive function and mucosal mass following MSBR.
• To determine if increased mucosal mass induced by IL-11 translates to improved substrate absorption.

Main Methods:

• Twenty-five rats underwent 80% small bowel resection.
• Rats received varying doses of IL-11 (0, 250, 500, 750, 1000 microg/kg/d) via osmotic pumps for 14 days.
• In vivo closed-recirculation technique measured [14C]galactose and [14C]glycine absorption; mucosal DNA content was also assessed.

Main Results:

• IL-11 at 250 microg/kg/d did not significantly alter substrate absorption.
• Higher doses of IL-11 (≥500 microg/kg/d) significantly increased both substrate absorption and mucosal mass compared to controls.
• The optimal dose for enhanced absorption and mucosal mass was 750 microg/kg/d, yielding 72% increase in galactose absorption, 112% in glycine absorption, and 98% in DNA content.

Conclusions:

• Systemic IL-11 administration enhances small intestine absorptive function beyond normal adaptation post-MSBR.
• The optimal dose for maximal effect on absorptive function was 750 microg/kg/d.
• IL-11 demonstrates potential as a therapeutic agent for patients with compromised intestinal function.