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Epithelial IL-18 Equilibrium Controls Barrier Function in Colitis.

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Interleukin-18 (IL-18) drives ulcerative colitis by disrupting the intestinal barrier. Blocking IL-18 signaling in intestinal epithelial cells protects against colitis and preserves goblet cells.

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Area of Science:

  • Gastroenterology
  • Immunology
  • Cell Biology

Background:

  • The intestinal mucosal barrier, crucial for controlling the microbiome, relies on goblet cells producing mucus.
  • Impaired goblet cell function and mucus layer breakdown are characteristic of inflammatory bowel disease, specifically ulcerative colitis.

Purpose of the Study:

  • To investigate the role of Interleukin-18 (IL-18) in the pathological breakdown of intestinal barrier integrity during colitis.
  • To elucidate the mechanism by which IL-18 signaling in intestinal epithelial cells influences goblet cell maturation and colitis severity.

Main Methods:

  • Utilized a mouse model of colitis.
  • Generated genetically modified mice with specific deletions of Il18, Il18r1 (IL-18 receptor 1) in intestinal epithelial cells, and Il18bp (IL-18 binding protein).
  • Assessed colitis severity, mucosal damage, and goblet cell maturation through histological and molecular analyses.

Main Results:

  • Deletion of Il18 or Il18r1 in intestinal epithelial cells conferred significant protection against colitis and mucosal damage.
  • Deletion of Il18bp led to severe colitis and loss of mature goblet cells.
  • Simultaneous deletion of Il18bp and Il18r1 in intestinal epithelial cells rescued colitis and goblet cell loss, confirming IL-18 signaling in epithelial cells as the key regulator.
  • IL-18 was found to inhibit goblet cell maturation by altering the transcriptional program governing goblet cell development.

Conclusions:

  • IL-18 signaling within intestinal epithelial cells is a critical driver of colitis pathology and intestinal barrier dysfunction.
  • Targeting IL-18 signaling in intestinal epithelial cells represents a potential therapeutic strategy for ulcerative colitis.
  • Understanding IL-18's regulation of goblet cell development is key to addressing goblet cell dysfunction in ulcerative colitis.