Transcytosis of Listeria monocytogenes across the intestinal barrier upon specific targeting of goblet cell accessible E-cadherin

J Exp Med. 2011 Oct 24;208(11):2263-77. doi: 10.1084/jem.20110560. Epub 2011 Oct 3.

Abstract

Listeria monocytogenes (Lm) is a foodborne pathogen that crosses the intestinal barrier upon interaction between its surface protein InlA and its species-specific host receptor E-cadherin (Ecad). Ecad, the key constituent of adherens junctions, is typically situated below tight junctions and therefore considered inaccessible from the intestinal lumen. In this study, we investigated how Lm specifically targets its receptor on intestinal villi and crosses the intestinal epithelium to disseminate systemically. We demonstrate that Ecad is luminally accessible around mucus-expelling goblet cells (GCs), around extruding enterocytes at the tip and lateral sides of villi, and in villus epithelial folds. We show that upon preferential adherence to accessible Ecad on GCs, Lm is internalized, rapidly transcytosed across the intestinal epithelium, and released in the lamina propria by exocytosis from where it disseminates systemically. Together, these results show that Lm exploits intrinsic tissue heterogeneity to access its receptor and reveal transcytosis as a novel and unanticipated pathway that is hijacked by Lm to breach the intestinal epithelium and cause systemic infection.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Biomarkers / metabolism
  • Cadherins / metabolism*
  • Cell Polarity
  • Exocytosis / physiology
  • Goblet Cells / cytology
  • Goblet Cells / metabolism*
  • Humans
  • Intestinal Mucosa / cytology*
  • Intestinal Mucosa / metabolism*
  • Listeria monocytogenes / metabolism*
  • Listeria monocytogenes / pathogenicity
  • Listeriosis / physiopathology
  • Mice
  • Mice, Inbred C57BL
  • Mice, Transgenic
  • Mucous Membrane / microbiology
  • Mucous Membrane / physiology
  • Mucous Membrane / ultrastructure
  • Transcytosis / physiology*

Substances

  • Biomarkers
  • Cadherins