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Beneficial effects of glutamine (GLN) have been described in many gastrointestinal disorders. The aim of the present study was to evaluate the preventative effect of oral GLN supplementation against acetic acid (AA) induced intestinal injury in a rat. Male Sprague–Dawley rats were divided into four experimental groups: control (CONTR) rats underwent laparotomy, control-glutamine (CONTR-GLN) rats were treated with enteral glutamine given in drinking water (2%) 48 hours before and five days following laparotomy, AA rats underwent laparotomy and injection of AA into an isolated jejunal loop, and acetic acid-glutamine (AA-GLN) rats underwent AA-induced injury and were treated with enteral GLN 48 hours before and 5 days following laparotomy. Intestinal mucosal damage (Park’s injury score), mucosal structural changes, enterocyte proliferation and enterocyte apoptosis were determined five days following intestinal injury. Western blotting was used to determine p-ERK and bax protein levels. AA-induced intestinal injury resulted in a significantly increased intestinal injury score with concomitant inhibition of cell turnover (reduced proliferation and enhanced apoptosis). Treatment with dietary GLN supplementation resulted in a decreased intestinal injury score with concomitant stimulation of cell turnover (enhanced proliferation and reduced apoptosis). In conclusion, pre-treatment with oral GLN prevents mucosal injury and improves intestinal recovery following AA-induced intestinal injury in rats.

nutrition and metabolism

Dietary glutamine supplementation prevents mucosal injury and modulates intestinal epithelial restitution following acetic acid induced intestinal injury in rats