IL-1α released from oral epithelial cells upon candidalysin exposure initiates an early innate epithelial response.

Abstract:

:Candida albicans is a commensal fungus that predominantly resides on mucosal surfaces and can cause lethal systemic infection when the host defense is compromised. Candidalysin is a cytolytic peptide toxin produced by C. albicans hyphae that is essential for mucosal tissue damage and is believed to contribute to the establishment of systemic infection and mortality. Candidalysin is also required for the epithelial innate response in which proinflammatory cytokines and chemokines are produced and neutrophil recruitment is initiated. It was recently reported that epidermal growth factor receptor (EGFR) was essential for the candidalysin-triggered epithelial response. The present study identified interleukin (IL)-1α as another component of candidalysin-mediated initial epithelial activation. We found that human oral epithelial cells released IL-1α rapidly after candidalysin exposure. Blockade of IL-1α/IL-1 receptor (IL-1R) signaling in candidalysin-exposed cells resulted in decreased phosphorylation of IκBα, decreased induction of IκBζ, and decreased production of granulocyte macrophage-colony stimulating factor and IL-8. Expression of c-Fos, which is induced downstream of EGFR signaling in candidalysin-treated cells, is less affected by IL-1R blockade. Inversely, blockade of EGFR signaling does not affect candidalysin-mediated phosphorylation of IκBα and induction of IκBζ, suggesting that independent signaling pathways contribute to the induction of NF-κB and c-Fos downstream of candidalysin pore formation site. Consistently, antibody inhibition of both EGFR and IL-1R enhanced the suppressive effect of cytokine production in candidalysin-treated cells. Thus, we identified the immediate release of IL-1α and its synergistic role with EGFR ligands on the initial activation of oral epithelial cells in response to candidalysin.

journal_name

Int Immunol

journal_title

International immunology

authors

Hanaoka M,Domae E

doi

10.1093/intimm/dxaa070

subject

Has Abstract

pub_date

2020-10-10 00:00:00

eissn

0953-8178

issn

1460-2377

pii

5920686

pub_type

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