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Open AccessBrief Report

Neutrophils Do Not Express IL-17A in the Context of Acute Oropharyngeal Candidiasis

1
Children's Hospital of Pittsburgh of UPMC, Department of Pediatrics, Pittsburgh, PA 15224, USA
2
Medical College of Wisconsin, Department of Pediatrics, Division of Infectious Diseases, Milwaukee, WI 53201, USA
3
Department of Medicine, Division of Rheumatology & Clinical Immunology, University of Pittsburgh, BST S702, 200 Lothrop Street, Pittsburgh, PA 15261, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Lawrence S. Young
Pathogens 2015, 4(3), 559-572; https://doi.org/10.3390/pathogens4030559
Received: 22 June 2015 / Revised: 13 July 2015 / Accepted: 21 July 2015 / Published: 24 July 2015
(This article belongs to the Special Issue Candida Albicans Infections)
IL-17 protects against pathogens by acting on nonhematopoietic cells to induce neutrophil recruitment through upregulation of chemokines and G-CSF. IL-17- and Th17-deficient humans and mice are susceptible to mucosal Candida albicans infections, linked to impaired neutrophil responses. IL-17 production is traditionally associated with CD4+ Th17 cells. However, IL-17 is also expressed during innate responses to facilitate rapid pathogen clearance. Innate IL-17-expressing cells include various lymphocyte-type subsets, including ILC3, NKT, γδ-T and “natural” Th17 (nTh17) cells. Some reports suggest that neutrophils can express IL-17 during fungal infections. Here, we asked whether neutrophils serve as a source of IL-17 during acute oropharyngeal candidiasis (OPC) using an IL-17A fate-tracking reporter mouse. Mice were subjected to OPC for two days, and oral tissue was analyzed by flow cytometry. IL-17A was expressed by γδ-T cells and TCRβ+ natural Th17 (nTh17) cells, as recently reported. Although infiltrating neutrophils were recruited to the tongue following infection, they did not express the IL-17A reporter. Moreover, neutrophil-depleted mice exhibited normal transcription of both Il17a and downstream IL-17-dependent gene targets after Candida challenge. Thus, in acute OPC, neutrophils are not a measurable source of IL-17 production, nor are they necessary to trigger IL-17-dependent gene expression, although they are essential for ultimate pathogen control. View Full-Text
Keywords: IL-17; Th17; Candida albicans; neutrophils; fungal infection; oral candidiasis; innate lymphocyte; TCR; γδ-T cell; mice IL-17; Th17; Candida albicans; neutrophils; fungal infection; oral candidiasis; innate lymphocyte; TCR; γδ-T cell; mice
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Huppler, A.R.; Verma, A.H.; Conti, H.R.; Gaffen, S.L. Neutrophils Do Not Express IL-17A in the Context of Acute Oropharyngeal Candidiasis. Pathogens 2015, 4, 559-572.

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