Original Paper

Archives of Dermatological Research

, Volume 305, Issue 1, pp 17-23

Increased production of soluble inducible costimulator in patients with diffuse cutaneous systemic sclerosis

  • Koichi YanabaAffiliated withDepartment of Dermatology, Faculty of Medicine, The University of Tokyo Email author 
  • , Yoshihide AsanoAffiliated withDepartment of Dermatology, Faculty of Medicine, The University of Tokyo
  • , Shinji NodaAffiliated withDepartment of Dermatology, Faculty of Medicine, The University of Tokyo
  • , Kaname AkamataAffiliated withDepartment of Dermatology, Faculty of Medicine, The University of Tokyo
  • , Naohiko AozasaAffiliated withDepartment of Dermatology, Faculty of Medicine, The University of Tokyo
  • , Takashi TaniguchiAffiliated withDepartment of Dermatology, Faculty of Medicine, The University of Tokyo
  • , Takehiro TakahashiAffiliated withDepartment of Dermatology, Faculty of Medicine, The University of Tokyo
  • , Yohei IchimuraAffiliated withDepartment of Dermatology, Faculty of Medicine, The University of Tokyo
  • , Tetsuo ToyamaAffiliated withDepartment of Dermatology, Faculty of Medicine, The University of Tokyo
    • , Hayakazu SumidaAffiliated withDepartment of Dermatology, Faculty of Medicine, The University of Tokyo
    • , Yoshihiro KuwanoAffiliated withDepartment of Dermatology, Faculty of Medicine, The University of Tokyo
    • , Yayoi TadaAffiliated withDepartment of Dermatology, Faculty of Medicine, The University of Tokyo
    • , Makoto SugayaAffiliated withDepartment of Dermatology, Faculty of Medicine, The University of Tokyo
    • , Takafumi KadonoAffiliated withDepartment of Dermatology, Faculty of Medicine, The University of Tokyo
    • , Shinichi SatoAffiliated withDepartment of Dermatology, Faculty of Medicine, The University of Tokyo

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Abstract

Inducible costimulator (ICOS) is crucial for T cell proliferation, production of various cytokines, and T cell-dependent B-cell responses. To determine the serum soluble ICOS (sICOS) level and its association with clinical parameters in patients with systemic sclerosis (SSc), serum sICOS level was examined by enzyme-linked immunosorbent assay in 38 patients with SSc and 24 healthy individuals. The expression of ICOS and ICOS ligand in skin was examined immunohistochemically. There was no significant difference in serum sICOS level between patients with SSc and healthy individuals. Patients with diffuse cutaneous SSc had higher levels of sICOS than those with limited cutaneous SSc (P < 0.05) or healthy individuals (P < 0.05). Serum sICOS level correlated positively with the severity of skin sclerosis. Patients with SSc and elevated sICOS level more often had interstitial lung disease and decreased vital capacity than those with normal sICOS level. The serum sICOS level was significantly greater in patients with early phase SSc than those with late phase SSc. ICOS and ICOS ligand immunostaining were observed on infiltrating dermal mononuclear cells in lesional skin tissue. These results suggest that the serum level of sICOS is increased in patients with diffuse cutaneous SSc and correlates with the severity and activity of skin sclerosis and interstitial lung disease. ICOS may contribute to the development of SSc. In addition, measurement of serum sICOS level in patients with early SSc may offer an important means for further evaluation of SSc disease severity.

Keywords

Systemic sclerosis ICOS Fibrosis ELISA Immunohistochemistry