EphA2 is an epithelial cell pattern recognition receptor for fungal β-glucans

Nat Microbiol. 2018 Jan;3(1):53-61. doi: 10.1038/s41564-017-0059-5. Epub 2017 Nov 13.

Abstract

Oral epithelial cells discriminate between pathogenic and non-pathogenic stimuli, and only induce an inflammatory response when they are exposed to high levels of a potentially harmful microorganism. The pattern recognition receptors (PRRs) in epithelial cells that mediate this differential response are poorly understood. Here, we demonstrate that the ephrin type-A receptor 2 (EphA2) is an oral epithelial cell PRR that binds to exposed β-glucans on the surface of the fungal pathogen Candida albicans. Binding of C. albicans to EphA2 on oral epithelial cells activates signal transducer and activator of transcription 3 and mitogen-activated protein kinase signalling in an inoculum-dependent manner, and is required for induction of a proinflammatory and antifungal response. EphA2 -/- mice have impaired inflammatory responses and reduced interleukin-17 signalling during oropharyngeal candidiasis, resulting in more severe disease. Our study reveals that EphA2 functions as a PRR for β-glucans that senses epithelial cell fungal burden and is required for the maximal mucosal inflammatory response to C. albicans.

MeSH terms

  • Animals
  • Candida albicans / growth & development
  • Candida albicans / metabolism*
  • Candidiasis, Oral / metabolism*
  • Candidiasis, Oral / pathology
  • Cell Line
  • Cytokines / biosynthesis
  • Disease Models, Animal
  • Endocytosis
  • Epithelial Cells / cytology
  • Epithelial Cells / metabolism
  • Epithelial Cells / microbiology
  • ErbB Receptors / antagonists & inhibitors
  • ErbB Receptors / metabolism
  • Inflammation Mediators / analysis
  • Male
  • Mice
  • Mice, Inbred C57BL
  • Mouth Mucosa / cytology
  • Mouth Mucosa / metabolism*
  • Mouth Mucosa / microbiology
  • Phosphorylation
  • Receptor, EphA2 / antagonists & inhibitors
  • Receptor, EphA2 / deficiency
  • Receptor, EphA2 / metabolism*
  • Receptors, Pattern Recognition / antagonists & inhibitors
  • Receptors, Pattern Recognition / deficiency
  • Receptors, Pattern Recognition / metabolism*
  • STAT3 Transcription Factor / metabolism
  • Signal Transduction
  • beta-Glucans / metabolism*

Substances

  • Cytokines
  • Inflammation Mediators
  • Receptors, Pattern Recognition
  • STAT3 Transcription Factor
  • Stat3 protein, mouse
  • beta-Glucans
  • ErbB Receptors
  • Receptor, EphA2