Increased expression of 2′5′oligoadenylate synthetase and double-stranded RNA dependent protein kinase messenger RNAs on affected skin of systemic sclerosis patients

• Published in: Archives of Dermatological Research 2007-08, Vol.299 (5-6), p.259-262
• Main Authors: Coelho, Luiz Felipe Leomil, de Oliveira, Jaquelline Germano, de Oliveira, Danilo Bretas, Guedes, Antônio Carlos Martins, Lanna, Cristina Costa Duarte, Prados, Roberto Zimmer, Ferreira, Paulo César Peregrino, Bonjardim, Cláudio Antônio, Kroon, Erna Geessien
• Format: Article
• Language: English
• ISSN: 0340-3696; 1432-069X
• DOI: 10.1007/s00403-007-0737-x

Scleroderma or systemic sclerosis (SSc) is an autoimmune disorder of unknown aetiology characterized by excessive collagen synthesis and subsequent deposition on the skin and various internal organs. Interferons (IFNs) are well-known immunomodulators and inhibitors of collagen production. However, IFN therapy has been implicated in the development or exacerbation of several autoimmune diseases, including SSc. We analyzed the expression of several interferon-stimulated genes (ISGs) in affected skin of SSc patients (skin tissue and cultured skin fibroblasts). A set of ISGs (PKR, 2[variant prime]5[variant prime]OAS, M×A, and 6-16) was analyzed by real-time PCR using RNA extracted from cultured skin fibroblasts and skin tissue of normal individuals and SSc patients. Both normal and SSc affected skin cultured fibroblasts were sensitive to the IFN treatment and presented similar levels of all ISGs tested. However, PKR and 2[variant prime]5[variant prime]OAS mRNA expression levels were significantly higher in the affected skin tissue of SSc patients when compared to normal controls. These data suggest that the IFN system plays a role in the pathogenesis of SSc. [PUBLICATION ABSTRACT]