Immunity to commensal skin fungi promotes psoriasiform skin inflammation

Charlotte Hurabielle, Verena M. Link, Nicolas Bouladoux, Seong Ji Han, Eric Dean Merrill, Yaima L. Lightfoot, Nickie Seto, Christopher K.E. Bleck, Margery Smelkinson, Oliver J. Harrison, Jonathan L. Linehan, Samira Tamoutounour, Michail S. Lionakis, Mariana J. Kaplan, Saeko Nakajima, Yasmine Belkaid

Research output: Contribution to journalArticlepeer-review

60 Scopus citations

Abstract

Under steady-state conditions, the immune system is poised to sense and respond to the microbiota. As such, immunity to the microbiota, including T cell responses, is expected to precede any inflammatory trigger. How this pool of preformed microbiota-specific T cells contributes to tissue pathologies remains unclear. Here, using an experimental model of psoriasis, we show that recall responses to commensal skin fungi can significantly aggravate tissue inflammation. Enhanced pathology caused by fungi preexposure depends on Th17 responses and neutrophil extracellular traps and recapitulates features of the transcriptional landscape of human lesional psoriatic skin. Together, our results propose that recall responses directed to skin fungi can directly promote skin inflammation and that exploration of tissue inflammation should be assessed in the context of recall responses to the microbiota.

Original languageEnglish (US)
Pages (from-to)16465-16474
Number of pages10
JournalProceedings of the National Academy of Sciences of the United States of America
Volume117
Issue number28
DOIs
StatePublished - Jul 14 2020

Keywords

  • Fungi
  • Microbiota
  • Psoriasis
  • Skin
  • Th17

ASJC Scopus subject areas

  • General

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