Glutamine protects function and improves preservation of small bowel segments

Area of Science:

• Transplantation research
• Organ preservation techniques
• Gastroenterology

Background:

• Effective organ preservation is critical for successful small bowel transplantation.
• University of Wisconsin (UW) solution, a common preservation fluid, lacks glutamine (Gln), a vital enterocyte fuel source.
• This study investigated the potential benefits of Gln supplementation in UW solution for preserving small bowel integrity.

Purpose of the Study:

• To evaluate the impact of glutamine-supplemented University of Wisconsin (UW) solution on the mucosal function and structure of cold-preserved small intestine.
• To determine the optimal concentration of glutamine for enhancing preservation efficacy.

Main Methods:

• Lewis rat jejunum segments were cold-preserved for 18 hours in various solutions: saline, UW solution alone, UW with 1-4% glutamine (Gln), or UW with 1-4% isonitrogenous balanced nonessential amino acids (NEAA).
• Key parameters measured included 14C-glucose transport, mucosal protein content, mucosal enzyme activities (maltase, alkaline phosphatase), villous height, and histological damage.

Main Results:

• University of Wisconsin (UW) solution with 2% glutamine (Gln) significantly enhanced glucose transport and mucosal protein levels compared to UW-only and 2% NEAA groups.
• A 2% Gln concentration markedly reduced histological damage in cold-preserved jejunum.
• Increasing Gln concentration to 4% did not yield further significant improvements over the 2% Gln group.

Conclusions:

• Supplementing University of Wisconsin (UW) solution with glutamine (Gln), particularly at a 2% concentration, offers significant protection against cold ischemic injury.
• Gln-enriched UW solution improves mucosal function and structural integrity of preserved small bowel segments, potentially enhancing transplantation outcomes.