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Increased urinary nitrate excretion in inflammatory bowel disease

B Melichar1, R Karlícek, M Tichý

  • 1Second Department of Internal Medicine, Faculty of Medicine, Charles University, Hradec Králové, Czech Republic.

European Journal of Clinical Chemistry and Clinical Biochemistry : Journal of the Forum of European Clinical Chemistry Societies
|January 1, 1994
PubMed
Summary

Elevated urinary nitrate levels were found in inflammatory bowel disease patients, suggesting increased endogenous nitrate synthesis linked to immune activation, not environmental factors.

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Area of Science:

  • Biochemistry
  • Immunology
  • Gastroenterology

Background:

  • Urinary nitrate traditionally indicates environmental exposure.
  • Recent research identified endogenous nitrate synthesis pathways.
  • Immune activation's role in endogenous metabolite production is increasingly recognized.

Purpose of the Study:

  • To investigate urinary nitrate levels in patients without significant environmental nitrate exposure.
  • To determine if inflammatory bowel disease (IBD) is associated with elevated endogenous nitrate synthesis.
  • To explore the link between immune activation in IBD and nitrate metabolism.

Main Methods:

  • Urine samples were collected from IBD patients and controls.
  • Nitrate concentration was measured and expressed as a nitrate/creatinine ratio.

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  • Statistical analysis compared nitrate levels between patient groups.

    • Main Results:

    • Patients with inflammatory bowel disease exhibited significantly higher urinary nitrate/creatinine ratios compared to controls (0.173 +/- 0.155 vs. 0.037 +/- 0.016 mol/mol creatinine, P < 0.01).
    • These findings were observed in patients presumed to have minimal environmental nitrate exposure.

    Conclusions:

    • Elevated urinary nitrate in IBD patients likely results from endogenous synthesis, not environmental load.
    • Immune activation associated with inflammatory bowel disease may induce this endogenous nitrate production.
    • Urinary nitrate may serve as a biomarker for immune-mediated conditions.