Gallagher, Catriona and Mahon, Julie Mac and O’Neill, Chloe and Cassidy, Féaron C. and Dunbar, Hazel and De Barra, Conor and Cadden, Caoimhe and Pisarska, Marta M. and Wood, Nicole and Masterson, Joanne C. and McNamee, Eoin N. and English, Karen and O’Shea, Donal and Tobin, Anne Marie and Hogan, Andrew E. (2022) Mucosal associated invariant T cells are altered in patients with Hidradenitis Suppurativa and contribute to the inflammatory milieu. bioRxiv: The preprint server for Biology.

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Abstract

Mucosal Associated Invariant T cells are a population of “innate” T cells, which express the invariant T cell receptor (TCR) a chain Va7.2-Ja33 and are capable of robust rapid cytokine secretion, producing a milieu of cytokines including IFN-g and IL-17. MAIT cells have been reported in multiple human tissues including the gut, periphery and skin. On-going research has highlighted their involvement in numerous inflammatory diseases ranging from rheumatoid arthritis and obesity to psoriasis. Hidradenitis Suppurativa (H.S) is a chronic inflammatory disease of the hair follicles, resulting in painful lesions of apocrine-bearing skin. Several inflammatory cytokines have been implicated in the pathogenesis of H.S including IL-17. The role of MAIT cells in H.S is currently unknown. In this study we show for the first time, that MAIT cells are altered in the peripheral blood of patients with H.S, with reduced frequencies and an IL-17 cytokine bias. We show that CCL20 expression is elevated in lesions of patients with H.S, and MAIT cells can actively traffic towards lesions via CCL20. We show that MAIT cells can accumulate in the lesionsfrom patients with H.S. when compared to adjacent skin, with an IL-17 bias. We show that elevated IL-17, can be linked to the activation of dermal fibroblasts, promoting the expression of chemotactic signals including CCL20 and CXCL1. Finally, we show that targeting the IL-17A transcription factor RORyt robustly reduces IL-17 production by MAIT cells from patients with H.S. Collectively our data detailsIL-17 producing MAIT cells as a novel player in the pathogenesis of H.S and highlights the potential of RORyt inhibition as a novel therapeutic strategy.

Item Type:	Article
Keywords:	Mucosal; associated invariant T cells; altered; patients; Hidradenitis Suppurativa; contribute; inflammatory milieu;
Academic Unit:	Faculty of Science and Engineering > Biology Faculty of Science and Engineering > Research Institutes > Human Health Institute
Item ID:	17115
Identification Number:	https://doi.org/10.1101/2022.01.17.476587
Depositing User:	Karen English
Date Deposited:	24 Apr 2023 14:20
Journal or Publication Title:	bioRxiv: The preprint server for Biology
Refereed:	Yes
URI:	Publisher
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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