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A systematic review of the role of interleukin-17 and the interleukin-20 family in inflammatory allergic skin diseases

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Purpose of review

Allergic skin diseases include atopic dermatitis/eczema, contact dermatitis, and drug hypersensitivity. Allergic skin diseases have a high prevalence. Atopic dermatitis is one of the most common inflammatory skin diseases and similar for allergic rhinitis and allergic asthma. Over a long period, allergic diseases have been regarded as immunoglobulin E-mediated T-helper-2 (Th2)-driven. But new cytokines and T cells have been discovered within the last years. In this systematic review, the focus is laid on interleukin-17 (IL-17) and the interleukin-20 (IL-20) family which appear to be fine-tuning the Th2-driven answer.

Recent findings

IL-17 is a proinflammatory cytokine, which is produced by T cells. Primarily, IL-17 is produced by activated CD4+ cells, called Th-17 cells. IL-17 regulates keratinocyte expression of adhesion molecules and chemokines. IL-17 is involved in the pathogenesis of inflammatory diseases as psoriasis, arthritis, and inflammatory bowel diseases. In allergic diseases, the involvement of the TH17/IL17-pathway has only been recently described. Regarding the IL-20 family, IL-22 is the most interesting and the most studied cytokine in terms of allergic inflammatory disorders. IL-22 is produced by T-helper 22 cells, a new subset of CD4+ cells.Summary

IL-17 as well as IL-22 seem to play a role in the pathogenesis of allergic skin diseases.
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Keywords: allergic disease; atopic dermatitis; contact eczema; hypersensitivity; interleukin-17; interleukin-22

Document Type: Research Article

Affiliations: Department of Dermatology and Allergy, Charité РUniversitätsmedizin Berlin, Berlin, Germany

Publication date: October 1, 2016

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