Psoriasis Research Today is a free monthly online journal that collates and summarizes the latest research about Psoriasis, including details on treatment, prevention, medication, causes.

Psoriatic scales: a promising source for the isolation of human skin-derived antimicrobial proteins.

Harder J, Schröder JM

Department of Dermatology, University Hospital Schleswig-Holstein, Campus Kiel, Schittenhelmstr. 7, D-24105 Kiel, Germany. jharder@dermatology.uni-kiel.de

Patients with psoriasis, a chronic, hyperproliferative and noninfectious skin disease, suffer surprisingly fewer cutaneous infections than would be expected. This observation led us to the hypothesis that a local "chemical shield" in the form of antimicrobial proteins provides psoriatic skin with resistance against infection. We subsequently began a systematic analysis of in vitro antimicrobially active proteins in psoriatic-scale extracts. A biochemical approach with rigorous purification and characterization combined with antimicrobial testing identified a number of mostly new human antibiotic peptides and proteins. In this review, we will focus on the most prominent antimicrobial proteins in psoriatic-scale extracts, which we identified as the S100-protein psoriasin, human beta-defensin 2 (hBD-2), RNase 7, lysozyme, and human neutrophil defensin 1-3. Apart from these cutaneous, antimicrobial proteins, only a few others, including hBD-3, have been characterized. A great number of minor antimicrobial proteins await further structural characterization.

Published 28 March 2005 in J Leukoc Biol, 77(4): 476-86.
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