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Intestinal mucosal immune defense mechanisms.

D F Keren1

  • 1Department of Pathology, University of Michigan, Ann Arbor 48109.

The American Journal of Surgical Pathology
|January 1, 1988
PubMed
Summary

The gut lining uses immune cells and secretory IgA to fight infections. Understanding these mucosal defenses helps explain inflammatory bowel disease and gluten sensitivity.

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Area of Science:

  • Immunology
  • Gastroenterology
  • Microbiology

Background:

  • Intestinal mucosal immunity involves humoral and cellular defense mechanisms.
  • Suppressor/cytotoxic T lymphocytes in the epithelial layer suggest a role in intraepithelial defense.
  • Secretory IgA is the predominant humoral response in the gastrointestinal and other mucosal tracts.

Purpose of the Study:

  • To elucidate the roles of cellular and humoral immunity in intestinal mucosal defense.
  • To understand the functions of secretory IgA in preventing pathogen and toxin attachment.
  • To explore the connection between mucosal immune responses and gastrointestinal diseases like IBD and gluten-sensitive enteropathy.

Main Methods:

  • Review of existing literature on intestinal mucosal immune mechanisms.
  • Analysis of the roles of T lymphocytes and secretory IgA.
  • Correlation of observed immune cell populations with specific gastrointestinal pathologies.

Main Results:

  • Interepithelial lymphocytes, particularly suppressor/cytotoxic T cells, are prominent in mucosal defense.
  • Secretory IgA prevents microbial and toxin adherence to epithelial cells.
  • Secretory IgA may participate in cytotoxic reactions against enteropathogens with other immune cells.

Conclusions:

  • Further research into mucosal immunity is crucial for understanding inflammatory bowel disease and gluten-sensitive enteropathy.
  • Elucidating the interplay between lamina propria plasmacytosis and increased interepithelial lymphocytes is key to understanding pathogenic mechanisms.

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