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Elevation of interleukin-6 in inflammatory bowel disease is macrophage- and epithelial cell-dependent

K Kusugami1, A Fukatsu, M Tanimoto

  • 1First Department of Internal Medicine, Nagoya University School of Medicine, Japan.

Digestive Diseases and Sciences
|May 1, 1995
PubMed

Insights

Elevated local interleukin-6 (IL-6) activity is a key feature of active inflammatory bowel disease (IBD). Macrophages and colonic epithelial cells are the primary sources of this increased IL-6 in active IBD patients.

Area of Science:

  • Gastroenterology
  • Immunology
  • Molecular Biology

Background:

  • Inflammatory bowel disease (IBD) involves chronic inflammation of the digestive tract.
  • Interleukin-6 (IL-6) is a cytokine implicated in inflammatory processes.

Purpose of the Study:

  • To investigate local interleukin-6 (IL-6) activity in colonic tissues of patients with inflammatory bowel disease (IBD).
  • To identify the cellular sources of IL-6 in active IBD.

Main Methods:

  • Culturing of lamina propria mononuclear cells (LPMC) and colonic mucosal tissues.
  • Northern blot analysis for IL-6 messenger RNA detection.
  • Immunofluorescent microscopy for IL-6 protein localization.

Main Results:

  • Active IBD specimens showed significantly higher IL-6 activity compared to controls.
  • IL-6 messenger RNA and protein were detected in LPMC and colonic epithelial cells from active IBD patients.
  • Increased IL-6-producing cells were observed in active IBD mucosal tissues.

Conclusions:

  • Elevated local IL-6 activity is a characteristic feature of active IBD.
  • Macrophages (CD68+ cells) and colonic epithelial cells are major contributors to IL-6 production in active IBD.

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