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Citrulline Generation Test: What Does It Measure?

Mahmoud A Mohammad1, Inka C Didelija1, Barbara Stoll1

  • 1USDA/ARS Children's Nutrition Research Center, Baylor College of Medicine, Houston, Texas, USA.

JPEN. Journal of Parenteral and Enteral Nutrition
|October 26, 2018
PubMed
Summary
This summary is machine-generated.

The citrulline generation test (CGT) increases plasma citrulline by boosting gut production, not by reducing clearance. This confirms CGT as a valuable tool for assessing gut function and mass.

Keywords:
argininecitrullineglutaminegut functiontest

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Area of Science:

  • Gastroenterology
  • Metabolic research
  • Amino acid metabolism

Background:

  • The citrulline generation test (CGT) is proposed for gut function assessment.
  • An increase in plasma citrulline after alanyl-glutamine may be due to reduced clearance, not just production.

Purpose of the Study:

  • To elucidate the mechanism behind increased plasma citrulline after alanyl-glutamine administration.
  • To validate the citrulline generation test (CGT) as a measure of gut function.

Main Methods:

  • A swine model was utilized with stable isotope tracers.
  • Plasma concentrations and enrichments were measured.
  • A non-steady-state model calculated amino acid kinetics.

Main Results:

  • The swine model mimicked human responses to alanyl-glutamine.
  • Plasma citrulline and its rate of appearance increased by approximately 45%.
  • Alanyl-glutamine hydrolysis yielded citrulline and glutamine; glutamine contributed to citrulline production, but citrulline disposal remained unchanged.

Conclusions:

  • Alanyl-glutamine increases plasma citrulline by enhancing production, not reducing clearance.
  • The citrulline generation test (CGT) accurately reflects the gut's metabolic response.
  • CGT is a promising tool for evaluating gut mass and function.