Serum levels of antimicrobial peptides and proteins do not correlate with psoriasis severity and are increased after treatment with fumaric acid esters.

2012 
Overexpression of antimicrobial peptides and proteins (AMPs) such as human β-defensin-2 (hBD2), LL37, and psoriasin has frequently been observed in lesional skin of psoriasis patients. We aimed to evaluate whether circulating AMP levels correlate with disease severity, and change under therapy with fumaric acid esters (FAE). We studied psoriasis patients who underwent systemic therapy using oral FAE (Fumaderm®). An enzyme-linked immunosorbent assay for the detection of serum protein expression of hBD2, LL37, and psoriasin was performed at baseline and after 12-week therapy. After 12-week FAE treatment of 28 patients, the median PASI significantly (P 0.05). In contrast to AMP expression in psoriatic skin serum, AMP levels seem not to correlate with disease severity. Increased serum AMP protein levels in psoriasis resolution are an unexpected observation that needs to be investigated more in detail in future studies.
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