Dermcidin is constitutively produced by eccrine sweat glands and is not induced in epidermal cells under inflammatory skin conditions

The British Journal of Dermatology
S RiegBirgit Schittek

Abstract

Antimicrobial peptides (AMPs) are important effector molecules of innate immunity, protecting epithelial surfaces of multicellular organisms. In human skin two classes of AMPs-the beta-defensins and the cathelicidins-are produced by keratinocytes primarily under inflammatory conditions. In contrast, dermcidin (DCD), a recently discovered AMP with broad-spectrum activity, is expressed in eccrine sweat glands and transported via sweat to the epidermal surface. To investigate whether DCD expression is induced under inflammatory conditions in epidermal keratinocytes. Lesional skin of the inflammatory skin diseases atopic dermatitis, psoriasis and lichen planus was analysed by immunohistochemistry using a polyclonal anti-DCD antiserum. We also examined whether DCD RNA expression is induced in cultured human keratinocytes, fibroblasts, melanocytes and melanoma cells. Whereas DCD was constitutively expressed in eccrine sweat glands of all skin biopsies, we found that, independent of the type of the inflammatory skin lesion, DCD protein expression was not induced in human epidermal keratinocytes. In contrast, beta-defensin 2 was expressed in epidermal keratinocytes of inflammatory human skin, but not in keratinocytes of healthy human s...Continue Reading

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Citations

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