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Candidalysin activates innate epithelial immune responses via epidermal growth factor receptor

Nat Commun. 2019 May 24;10(1):2297. doi: 10.1038/s41467-019-09915-2.

Abstract

Candida albicans is a fungal pathobiont, able to cause epithelial cell damage and immune activation. These functions have been attributed to its secreted toxin, candidalysin, though the molecular mechanisms are poorly understood. Here, we identify epidermal growth factor receptor (EGFR) as a critical component of candidalysin-triggered immune responses. We find that both C. albicans and candidalysin activate human epithelial EGFR receptors and candidalysin-deficient fungal mutants poorly induce EGFR phosphorylation during murine oropharyngeal candidiasis. Furthermore, inhibition of EGFR impairs candidalysin-triggered MAPK signalling and release of neutrophil activating chemokines in vitro, and diminishes neutrophil recruitment, causing significant mortality in an EGFR-inhibited zebrafish swimbladder model of infection. Investigation into the mechanism of EGFR activation revealed the requirement of matrix metalloproteinases (MMPs), EGFR ligands and calcium. We thus identify a PAMP-independent mechanism of immune stimulation and highlight candidalysin and EGFR signalling components as potential targets for prophylactic and therapeutic intervention of mucosal candidiasis.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Air Sacs / microbiology
  • Animals
  • Candida albicans / genetics
  • Candida albicans / immunology*
  • Candida albicans / metabolism
  • Candidiasis / immunology
  • Candidiasis / microbiology
  • Cell Line, Tumor
  • Disease Models, Animal
  • Epithelial Cells / immunology
  • Epithelial Cells / metabolism
  • Epithelial Cells / microbiology
  • ErbB Receptors / genetics
  • ErbB Receptors / immunology
  • ErbB Receptors / metabolism
  • Female
  • Fungal Proteins / genetics
  • Fungal Proteins / immunology*
  • Fungal Proteins / metabolism
  • Host-Pathogen Interactions / immunology*
  • Humans
  • MAP Kinase Signaling System / immunology
  • Matrix Metalloproteinases / immunology
  • Matrix Metalloproteinases / metabolism
  • Mice
  • Mice, Inbred BALB C
  • Mucous Membrane / immunology
  • Mucous Membrane / microbiology
  • Pharyngitis / immunology
  • Pharyngitis / microbiology
  • Phosphorylation
  • Zebrafish

Substances

  • ECE1 protein, Candida albicans
  • Fungal Proteins
  • EGFR protein, human
  • EGFR protein, mouse
  • ErbB Receptors
  • Matrix Metalloproteinases