Langerhans cells suppress CD49a+ NK cell-mediated skin inflammation

Felix Scholz, Shruti Naik, Fayyaz S. Sutterwala, Daniel H. Kaplan

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Recruitment of innate immune effector cells into sites of infection is a critical component of resistance to pathogen infection. Using a model of intradermal footpad injection of Candida albicans, we observed that inflammation as measured by footpad thickness and neutrophil recruitment occurred independent of adoptive immunity but was significantly reduced in MyD88-/- and IL-6-/- mice. Unexpectedly, huLangerin-DTA mice (ΔLC) that lack Langerhans cells (LC) developed increased skin inflammation and expressed higher amounts of IL-6, suggesting a suppressive role for LC. Increased inflammation also occurred in Rag1-/- DLC mice but was reversed by Ab-mediated ablation of NK cells. CXCR6+CD49a+ NK cells are a liver-resident subset that can mediate inflammatory skin responses. We found that exaggerated skin inflammation was absent in ΔLC 3 CXCR6-/- mice. Moreover, the exaggerated response in ΔLC mice could be adoptively transferred with liver CD49a+ NK cells. Finally, CD49a+ NK cells in ΔLC but not control mice were recruited to the skin, and inhibition of their recruitment prevented the exaggerated response. Thus, in the absence of LC, CD49a+ liver NK cells display an inappropriately proinflammatory phenotype that results in increased local skin inflammation. These data reveal a novel function for LC in the regulation of this recently described subset of skin tropic NK cells.

Original languageEnglish (US)
Pages (from-to)2335-2342
Number of pages8
JournalJournal of Immunology
Volume195
Issue number5
DOIs
StatePublished - Sep 1 2015

Bibliographical note

Publisher Copyright:
Copyright © 2015 by The American Association of Immunologists, Inc.

Copyright:
Copyright 2019 Elsevier B.V., All rights reserved.

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