Psoriasin (S100A7) contributes to stress-induced angiogenesis in psoriasis by the regulation of angiogenic factors in keratinocytes and promotion of angiogenic properties of dermal endothelial cells

• The S100 protein psoriasin, S100A7, is highly expressed in psoriasis. Vascular modifications occur early in the development of psoriasis and angiogenesis is one of the key features in the pathogenesis of the disease. This study aims to define the angiogenic properties of psoriasin in keratinocytes and to investigate the effects on dermal endothelial cells, thereby promoting angiogenesis in psoriasis. We showed that psoriasin expression, demonstrated by qPCR, is induced by hydrogen peroxide (H2O2) in keratinocytes and by cellular stress, such as hypoxia and cobalt chloride (CoCl2). Down-regulation of psoriasin, by siRNA, decreased the H2O2-induced expression of VEGF, heparin-binding EGF-like growth factor (HB-EGF) and matrix metalloproteinase (MMP)-1, and counteracted the reduction of the anti-angiogenic factor thrombospondin (THBS)-1. Extracellularly psoriasin was found to induce cell proliferation, migration and tube formation to a similar degree as VEGF and to induce the pro-angiogenic factors VEGF and IL-8 in dermal endothelial cells. Furthermore, we demonstrated that psoriasin-induced migration was mediated by the phosphoinositide-3-kinase (PI3K) and nuclear factor-kappa beta (NF-κB) signaling pathways. In conclusion, psoriasin is induced by cellular stress conditions and amplifies H2O2-induced expression of angiogenic factors relevant for psoriasis in keratinocytes. Moreover, psoriasin contributes to key features of the angiogenic process by inducing proliferation, migration and tube formation and increasing pro-angiogenic factors in dermal endothelial cell. Altogether, our data suggest that psoriasin is promoted by oxidative stress and mediate angiogenesis in psoriasis.

Ämnesord

MEDICIN OCH HÄLSOVETENSKAP  -- Klinisk medicin -- Reumatologi och inflammation (hsv//swe)

MEDICAL AND HEALTH SCIENCES  -- Clinical Medicine -- Rheumatology and Autoimmunity (hsv//eng)

MEDICIN OCH HÄLSOVETENSKAP  -- Hälsovetenskap (hsv//swe)

MEDICAL AND HEALTH SCIENCES  -- Health Sciences (hsv//eng)

Nyckelord

MEDICINE

MEDICIN

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