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Changes in the mucosal expression of interleukin 15 in Helicobacter pylori-associated gastritis

F Luzza1, T Parrello, G Monteleone

  • 1Dipartimento di Medicina Sperimentale e Clinica, Università di Catanzaro Magna Graecia, Italy.

FEMS Immunology and Medical Microbiology
|June 23, 1999
PubMed

Insights

Interleukin-15 (IL-15) is expressed in the gastric mucosa. Helicobacter pylori infection may suppress IL-15 levels, which increase after successful eradication, suggesting a role for IL-15 in H. pylori-associated gastritis.

Area of Science:

  • Immunology
  • Gastroenterology
  • Microbiology

Background:

  • Interleukin-15 (IL-15) is a cytokine crucial for immune cell development and function.
  • Gastric mucosal inflammation is a hallmark of Helicobacter pylori infection.
  • The role of IL-15 in H. pylori-induced gastritis is not well understood.

Purpose of the Study:

  • To investigate the expression of IL-15 in the human gastric mucosa.
  • To determine the association between IL-15 levels and H. pylori infection status.
  • To explore the changes in IL-15 expression following H. pylori eradication therapy.

Main Methods:

  • Detection of IL-15 transcripts and protein in gastric mucosal biopsies.
  • Comparison of IL-15 expression in H. pylori-positive and H. pylori-negative individuals.
  • Assessment of IL-15 levels before and after successful H. pylori eradication.

Main Results:

  • IL-15 transcripts were detected in 100% of H. pylori-negative patients and 28% of H. pylori-positive patients.
  • IL-15 mRNA and protein were found in 17% of patients before eradication and 83% after successful eradication.
  • Gastritis scores improved significantly after eradication, but IL-15 expression did not correlate with gastritis severity in H. pylori-infected patients.

Conclusions:

  • This study provides the first evidence of IL-15 expression in the human gastric mucosa.
  • H. pylori infection appears to down-regulate IL-15 expression in the gastric mucosa.
  • IL-15 levels increase after successful H. pylori eradication, suggesting a potential role in gastritis resolution.

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