Luminal Glutamine Perfusion Alters Endotoxin‐Related Changes in Ileal Permeability of the Piglet

Abstract

Background: The objective of this study was to investigate whether luminal perfusion with glutamine or with oxygenated glutamine solutions prevents endotoxin-induced changes in mucosal permeability. Methods: Three 15-cm segments of distal ileum were isolated in anesthetized 21-day-old piglets (n = 4) and perfused (50 mL/h) with Ringer's lactate solution, Ringer's lactate solution with 2% glutamine (wt/vol), glutamine, or glutamine purged with oxygen at 37°C for 280 minutes. Plasma-to-lumen clearances of ⁵¹Cr-EDTA and urea were measured to assess mucosal permeability. At time 0 minutes, loading and maintenance IV infusions of markers were begun. Baseline permeabilities were obtained from time 60 to 80 minutes, and IV endotoxin (50 μg/kg) was introduced from time 80 to 140 minutes. Results: Results are expressed as the ratio of the clearances of the two probes (C_EDTA/C_UREA). Permeability increased from baseline in loops perfused with Ringer's lactate solution vs loops perfused with glutamine purged with oxygen and with glutamine alone (p < .01). Saturation with oxygen was without effect inasmuch as glutamine alone negated permeability increases. Intestinal myeloperoxidase activity did not differ with perfusate (p > .05). Conclusions: These data suggest that endotoxin-induced permeability changes can be prevented or delayed by the supply of luminal glutamine at the time of insult. (Journal of Parenteral and Enteral Nutrition19:83-87 1995)