Abstract
Tumor Necrosis Factor-α (TNF-α) plays a pivotal role in psoriasis, an immuno-mediated and genetic skin disease. Anti-TNF-α inhibitors, such as etanercept, are widely used in clinical practice. By immunofluorescence, we investigated the expression of junctional transmembrane proteins in desmosomes (desmocollin-1, Dsc1; desmoglein-1, Dsg1), adherens junctions (E-cadherin), tight junctions (occludin), biomarkers of keratinocyte differentiation (keratin-10, K10; keratin-14, K14; keratin-16, K16; involucrin), epithelial proliferation and apoptosis in psoriatic skin before/after etanercept treatment (n = 5) and in control skin samples (n = 5). Occludin, K14, K16 and involucrin expressions were altered in psoriatic epidermis, while Dsc1, Dsg1, E-cadherin and K10 localisations were comparable to controls. Etanercept promoted the restoration of the physiological condition as suggested by a more differentiated keratinocyte phenotype and a reduced epidermal proliferation rate.
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