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Alanyl-Glutamine-Supplemented Parenteral Nutrition Increases Luminal Mucus Gel and Decreases Permeability in the Rat Small Intestine

Department of Pediatric Surgery, Osaka University Medical School, Osaka, Japan

Yasuhiko Iiboshi, MD, PhD

Department of Pediatric Surgery, Osaka University Medical School, Osaka, Japan

Li Cui, MD

Department of Pediatric Surgery, Osaka University Medical School, Osaka, Japan

Masafumi Wasa, MD, PhD

Department of Pediatric Surgery, Osaka University Medical School, Osaka, Japan

Kinya Sando, MD, PhD

Department of Pediatric Surgery, Osaka University Medical School, Osaka, Japan

Yoji Takagi, MD, PhD

Department of Pediatric Surgery, Osaka University Medical School, Osaka, Japan

Akira Okada, MD, PhD

Department of Pediatric Surgery, Osaka University Medical School, Osaka, Japan

Background: Effect of supplemental alanyl-glutamine in standard TPN (S-TPN) on luminal mucus gel and small intestinal permeability was investigated. Methods: Thirty Sprague-Dawley rats were divided into group I (n = 10), receiving standard rat diet; group II (n = 10), receiving S-TPN; and group III (n = 10), receiving alanyl-glutamine-supplemented TPN for 1 week. After 1 week, fluorescein isothiocyanate (FITC)-dextran was injected into the small intestine of the rats, and they were killed. A small intestinal sample and portal blood were obtained for morphologic and functional analysis of mucus gel and intestinal permeability. Results: In group II, thickness and optical density of mucus gel per millimeter serosal length of intestine were significantly lower than group I (p < .001) and were significantly higher in group III than in group II (p < .001). The number of goblet cells in the villi and in the crypt of the small intestine was significantly lower in group II than in group I (p < .001) and was significantly higher in group III than in group II (p < .001), with the exception of the villi of jejunum. Villous and crypt surface area per millimeter serosal length of intestine was significantly lower in group II than in group I (p < .001) and was significantly higher in group III than in group II (p < .001). Small intestinal permeability to FITC-dextran was significantly higher in group II than in group I (p < .001) and was significantly lower in group III than in group II (p < .001). Glucosamine synthetase level was significantly higher in group III than in group I and ileum of group II (p < .001). Conclusions: Alanyl-glutamine-supplemented TPN prevents a decrease in mucus gel and an increase in small intestinal permeability associated with S-TPN. (Journal of Parenteral and Enteral Nutrition 23:24-31, 1999)

Journal of Parenteral and Enteral Nutrition, Vol. 23, No. 1, 24-31 (1999)
DOI: 10.1177/014860719902300124


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