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Pennino, D.* ; Eyerich, K.* ; Scarponi, C.* ; Carbone, T.* ; Eyerich, S. ; Nasorri, F.* ; Garcovich, S.* ; Traidl-Hoffmann, C. ; Albanesi, C.* ; Cavani, A.*

IL-17 amplifies human contact hypersensitivity by licensing hapten nonspecific Th1 cells to kill autologous keratinocytes.

J. Immunol. 184, 4880-4888 (2010)
DOI PMC
Th17 is a newly identified lineage of effector T cells involved in autoimmunity and immune responses to pathogens. We demonstrate in this study the pathogenic role of IL-17-producing CD4(+) T lymphocytes in allergic contact dermatitis (ACD) to skin-applied chemicals. IL-17(+) T cells infiltrate ACD reactions and predominantly distribute at the site of heavy spongiosis. Skin IL-17(+) T cells were functionally and phenotypically heterogeneous: although pure Th17 prevailed in ACD skin, hapten responsiveness was restricted to Th1/IL-17 (IFN-gamma(+)IL-17(+)) and Th0/IL-17 (IFN-gamma(+)IL-17(+)IL-4(+)) fractions, and to lesser extent Th2/IL-17 cells. In the IFN-gamma-dominated ACD environment, IL-17-releasing T cells affect immune function of keratinocytes by promoting CXCL8, IL-6, and HBD-2 production. In addition, compared with Th1, supernatants from Th1/IL-17 T cells were much more efficient in inducing ICAM-1 expression on keratinocytes and keratinocyte-T cell adhesiveness in vitro. As a consequence, exposure to combined IFN-gamma and IL-17 rendered keratinocytes susceptible to ICAM-1-dependent Ag nonspecific T cell killing. Thus, IL-17 efficiently amplifies the allergic reaction by rendering virtually all of the T lymphocytes recruited at the site of skin inflammation capable to directly contribute to tissue damage.
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Publication type Article: Journal article
Document type Scientific Article
Corresponding Author
Keywords Regulatory t-cells; Eczematous dermatitis; Skin inflammation; Immune-responses; Innate; CD8(+); Lymphocytes; Psoriasis; Nickel; Activation
ISSN (print) / ISBN 0022-1767
e-ISSN 1550-6606
Journal Journal of Immunology
Quellenangaben Volume: 184, Issue: 9, Pages: 4880-4888 Article Number: , Supplement: ,
Publisher American Association of Immunologists
Non-patent literature Publications
Reviewing status Peer reviewed
Institute(s) Institute of Lung Health and Immunity (LHI)
Institute of Epidemiology (EPI)