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Related Experiment Videos

Intestinal glutamate metabolism.

P J Reeds1, D G Burrin, B Stoll

  • 1U.S. Department of Agriculture/Agricultural Research Service, Children's Nutrition Research Center, Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA.

The Journal of Nutrition
|March 29, 2000
PubMed
Summary

Dietary glutamate is the primary energy source for the gut, fueling ATP generation and supporting crucial functions like glutathione synthesis. This finding highlights glutamate

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Area of Science:

  • Gastroenterology and Metabolism
  • Nutritional Biochemistry

Background:

  • The intestinal tract has a high metabolic rate, but energy substrates are poorly understood in fed states.
  • Quantifying gut substrate utilization is complex due to dietary and arterial supply.

Purpose of the Study:

  • To determine the primary substrates used for energy generation (ATP production) in the gut of fed animals.
  • To elucidate the specific roles of dietary and arterial substrates in intestinal metabolism.

Main Methods:

  • Utilized piglets fed whole-milk protein diets.
  • Combined portal nutrient balance measurements with enteral and intravenous infusions of [U-(13)C]substrates.
  • Tracked substrate metabolism and CO(2) production.

Main Results:

  • Dietary glutamate was extensively metabolized (95%) in the first pass, with 50% converted to CO(2).
  • Dietary glucose oxidation was minimal; arterial glutamine contributed no more than 15% to CO(2) production.
  • Glutamate emerged as the largest contributor to intestinal energy generation.
  • Dietary glutamate served as a specific precursor for glutathione, arginine, and proline biosynthesis.

Conclusions:

  • Dietary glutamate plays a critical, previously underestimated role in gut energy metabolism.
  • Glutamate's functions in the gut are distinct from those of arterial glutamine.
  • These findings emphasize the importance of dietary glutamate for intestinal health and function.

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