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Area of Science:

  • Cell Biology
  • Immunology
  • Gastroenterology

Background:

  • Epithelial integrity is crucial for host defense.
  • The link between junctional scaffolds and antimicrobial autophagy is not well understood.

Purpose of the Study:

  • To investigate the role of GEF-H1 isoforms in intestinal epithelial integrity and host defense.
  • To elucidate the mechanism by which pathogen infection triggers autophagy and inflammation.

Main Methods:

  • Conditional deletion of Arhgef2-207 in mouse intestinal epithelium.
  • Analysis of human intestinal organoids infected with Listeria monocytogenes.
  • Immunofluorescence microscopy to assess protein localization and epithelial polarity.

Main Results:

  • Distinct GEF-H1 isoforms (Arhgef2-207/ARHGEF2-219) localize to adherens junctions via Nectin-3 and Afadin.
  • Loss of Arhgef2-207 induces compensatory Arhgef2-201 expression, leading to barrier defects, autophagy activation, and inflammation.
  • Listeria infection triggers an ARHGEF2 isoform switch, activating autophagy through STING and LC3, and causing loss of epithelial polarity and Na+/K+-ATPase.

Conclusions:

  • Pathogen-induced GEF-H1 isoform switching links junctional disruption to autophagy and mucosal immune activation.
  • This pathway represents a novel mechanism for epithelial cells to couple barrier integrity with cell-intrinsic host defense.