The pathogenesis of the chronic inflammatory skin disease acne inversa (AI, also known as hidradenitis suppurativa) involves epidermal alterations such as psoriasiform epidermal hyperplasia and keratin pluggings. Keratinocytes are an important source of proinflammatory molecules in inflammatory skin diseases and can be stimulated by IL-17+ cells.
Objectives and Methods:
To explore the possible role of the epithelium in the pathogenesis of AI, we performed immunohistochemical stainings and Western blot experiments to investigate localization and expression of inflammation-associated molecules, including the cytokine interleukin (IL)-17, components of the inflammasome including caspase-1 and the endogenous danger-associated molecular pattern (DAMP) molecules S100A8 and S100A9 (calprotectin). To examine a possible effect of upregulated proinflammatory cytokines on the inflammatory infiltrate, differences in the cellular composition of perifollicular and deep dermal infiltrates were analyzed.
The number of IL-17+ cells is increased in lesional and perilesional AI skin. The epidermis produces proinflammatory molecules and shows an upregulated expression of components of the NLRP3-inflammasome, activated caspase-1 and expression of S100A8/A9. Additionally, the course of the inflammatory process in AI involves influx of innate immune cells, particularly IL-17-expressing neutrophils.
IL-17-producing cells are present in lesional and perilesional AI skin and may contribute to the initiation of inflammatory processes. Furthermore, the epidermis is a source of proinflammatory cytokines, shows inflammasome activation and expresses S100A8/S100A9, thereby possibly contributing to the propagation of inflammation. A massive influx of IL-17-expressing neutrophils is observed in the deep infiltrate.
|Advisor:||Goebeler , Matthias , Prelog , Martina|
|School:||Bayerische Julius-Maximilians-Universitaet Wuerzburg (Germany)|
|Source:||DAI-C 81/7(E), Dissertation Abstracts International|
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