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Related Experiment Videos

Glucocorticoids regulate intestinal glutaminase expression.

P Sarantos1, A Abouhamze, W W Souba

  • 1Department of Surgery, University of Florida College of Medicine, Gainesville.

Surgery
|August 1, 1992
PubMed
Summary
This summary is machine-generated.

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Glucocorticoids, like dexamethasone, increase intestinal glutaminase expression and activity. This adaptive response may enhance energy supply to mucosal cells during stress.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Gastroenterology

Background:

  • Intestinal glutamine metabolism relies on the glutaminase enzyme.
  • Post-operative increases in glutamine utilization suggest hormonal regulation.

Purpose of the Study:

  • To investigate if glucocorticoid hormones regulate mucosal glutaminase expression at the molecular level following surgical stress.

Main Methods:

  • Rats were treated with dexamethasone and sacrificed at intervals.
  • Jejunal mucosal RNA was analyzed for glutaminase mRNA via Northern hybridization.
  • Glutaminase activity and kinetic parameters were measured.

Main Results:

  • Dexamethasone significantly increased glutaminase mRNA levels and enzyme activity.

Related Experiment Videos

  • The rise in mRNA preceded the increase in activity, indicating de novo synthesis.
  • Increased activity was due to enhanced maximal enzyme capacity, not altered affinity.

    • Conclusions:

    • Glucocorticoids may enhance intestinal glutamine utilization by upregulating glutaminase expression.
    • This could be an adaptive mechanism to supply energy to mucosal cells during stress states.