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The role of PSMB 9 upregulated by interferon signature in the pathophysiology of cutaneous lesions of dermatomyositis and systemic lupus erythematosus
Author(s) -
Nakamura K.,
Jinnin M.,
Kudo H.,
Inoue K.,
Nakayama W.,
Honda N.,
Kajihara I.,
Masuguchi S.,
Fukushima S.,
Ihn H.
Publication year - 2016
Publication title -
british journal of dermatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.304
H-Index - 179
eISSN - 1365-2133
pISSN - 0007-0963
DOI - 10.1111/bjd.14385
Subject(s) - dermatomyositis , medicine , pathophysiology , systemic disease , connective tissue disease , lupus erythematosus , pathology , cutaneous lupus erythematosus , dermatology , immunology , immunopathology , autoimmune disease , disease , antibody
Summary Background Dermatomyositis ( DM ) and systemic lupus erythematosus ( SLE ) have common skin features, including dermal mucin deposition and interferon signature, although their roles are unknown. Objectives To identify common or specific molecular changes in DM and SLE skin. Methods Proteomic analysis was performed using DM and healthy skin. Glycosaminoglycans were analysed by high‐performance liquid chromatography. Results The expression of 60 proteins was upregulated or downregulated in DM skin compared with healthy skin in the proteomic analysis. Among those proteins, PSMB 9, an immunoproteasome subunit, was upregulated in the epidermis of DM and SLE , but not in other skin diseases. Furthermore, versican V1, a core protein for glycosaminoglycans, was upregulated, while type I collagen was downregulated in the dermis of DM and SLE skin. Interferon stimulated PSMB 9 expression in cultured keratinocytes and reduced collagen expression in dermal fibroblasts, but did not affect versican expression. The PSMB 9 knock‐down in keratinocytes led to significant suppression of transforming growth factor ( TGF )‐β2 and TGF ‐β3, inducers of versican synthesis. TGF ‐β3 expression was upregulated in both DM and SLE , while TGF ‐β2 expression was increased only in the DM epidermis. ΔDi HS ‐diS1, a component of heparan sulfate, was significantly increased only in DM . TGF ‐β2 expression significantly increased the ΔDi HS ‐diS1 expression in dermal fibroblasts in vitro . Conclusions The interferon signature in DM and SLE skin reduces collagen in dermal fibroblasts, whereas overexpression of PSMB 9 induced by interferon stimulates versican inducers in epidermal keratinocytes. In addition, the TGF ‐β2–ΔDi HS ‐diS1 pathway may be responsible for the specific molecular change in DM skin.