Hypoxia differentially regulates nutrient transport in rat jejunum regardless of luminal nutrient present

Aggressive enteral nutrition and poor intestinal perfusion are hypothesized to play an important pathogenic role in nonocclusive small bowel necrosis. This study tests the hypothesis that glucose and glutamine transport are differentially regulated during hypoxia regardless of the luminal nutrient p...

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Bibliographic Details
Published in:American journal of physiology: Gastrointestinal and liver physiology 2002-12, Vol.46 (6), p.G1336-G1342
Main Authors: KLES, K. A, TAPPENDEN, K. A
Format: Article
Language:English
Subjects:
Anatomy & physiology
Biological and medical sciences
Digestive system
Gastroenterology. Liver. Pancreas. Abdomen
Medical sciences
Nutrition
Other diseases. Semiology
Rodents
Stomach. Duodenum. Small intestine. Colon. Rectum. Anus
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Summary:Aggressive enteral nutrition and poor intestinal perfusion are hypothesized to play an important pathogenic role in nonocclusive small bowel necrosis. This study tests the hypothesis that glucose and glutamine transport are differentially regulated during hypoxia regardless of the luminal nutrient present. Sprague-Dawley rats (247 +\- 3 g; n = 16) were randomized to receive 1 h of intestinal hypoxia or serve as normoxic controls. During this hour, jejunal loops were randomized to receive in situ perfusions of mannitol, glucose, or glutamine. When compared with normoxic groups, glucose but not glutamine transport was impaired (P < 0.001) during hypoxia. Messenger RNA abundance of the sodium glucose cotransporter sodium-dependent glucose cotransporter-1 (SGLT-1) and neutral basic amino acid transporter Bo did not differ with hypoxia or nutrient perfused. Jejunal brush-border SGLT-1 abundance was decreased (P = 0.039) with hypoxia; however, total cellular SGLT-1 protein abundance did not differ among treatment groups. These data indicate that SGLT-1 activity is regulated during hypoxia at the posttranslational level. Additional information regarding the mechanisms regulating nutrient transport in the hypoperfused intestine is critical for optimizing the composition of enteral nutrient formulas.
ISSN:0193-1857
1522-1547