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The dyspeptic macrophage 30 years later: an update in the pathogenesis of Crohn's disease

R Caprilli1, G Frieri

  • 1University of Rome La Sapienza, Via di Novella, 11, 00199 Rome, Italy. caprilli@interfree.it

Digestive and Liver Disease : Official Journal of the Italian Society of Gastroenterology and the Italian Association for the Study of the Liver
|November 26, 2008
PubMed

Insights

Crohn's disease involves impaired autophagy and "dyspeptic macrophages" that cannot clear bacteria. This genetic defect leads to increased exposure to gut bacteria and T cell activation, contributing to the disease.

Area of Science:

  • Gastroenterology
  • Immunology
  • Genetics

Background:

  • Crohn's disease pathogenesis is linked to defective autophagy, an intracellular process crucial for responding to invasive bacteria.
  • Genome-wide association studies identify autophagy-related genes, including ATG16L1 and IFIH1, as significantly associated with Crohn's disease risk.

Observation:

  • Patients with Crohn's disease exhibit increased colonization by adherent/invasive Escherichia coli (AIEC) strains in their intestinal mucosa.
  • AIEC strains can penetrate the mucosal barrier, survive within macrophages, and trigger inflammatory responses like TNF-alpha secretion and granuloma formation.
  • A defective ability of mucosal macrophages to kill bacteria has been observed in Crohn's disease patients, leading to heightened exposure to commensal bacteria and T cell activation.

Findings:

  • The concept of the "dyspeptic macrophage," characterized by impaired degradation of phagocytosed material, aligns with defective autophagy observed in Crohn's disease.
  • This study demonstrates that the impaired macrophage function and defective autophagy represent a shared pathogenetic mechanism in Crohn's disease.
  • Crucially, this study provides evidence that the impaired macrophage function in Crohn's disease is genetically determined.

Implications:

  • Understanding the genetic basis of impaired macrophage function offers new insights into Crohn's disease etiology.
  • Targeting autophagy or macrophage dysfunction presents potential therapeutic strategies for Crohn's disease.
  • Further research into the interaction between host genetics, autophagy, macrophages, and the gut microbiome is warranted for Crohn's disease.

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