Sera from anti-Jo-1-positive patients with polymyositis and interstitial lung disease induce expression of intercellular adhesion molecule 1 in human lung endothelial cells
2009 (English)In: Arthritis and Rheumatism, ISSN 0004-3591, E-ISSN 1529-0131, Vol. 60, no 8, 2524-2530 p.Article in journal (Refereed) Published
OBJECTIVE: To investigate whether sera or purified IgG from patients with polymyositis (PM) and patients with dermatomyositis (DM), with or without interstitial lung disease (ILD), can activate endothelial cells (ECs). METHODS: Patients' sera were selected based on the presence or absence of anti-Jo-1, anti-SSA, or anti-U1 small nuclear RNP autoantibodies. The presence of autoantibodies was determined by line blot assays. Cultured human microvascular ECs derived from lung tissue (HMVEC-L) were incubated with sera or purified IgG from 22 patients with PM, 7 patients with DM, and 10 healthy individuals as controls. Assessment of intercellular adhesion molecule 1 (ICAM-1) expression was conducted by immunofluorescence (n=22) and by cell-based enzyme-linked immunosorbent assay (ELISA) (n=20). Serum levels of soluble ICAM-1 (sICAM-1) were determined by ELISA. RESULTS: Sera from PM patients with ILD who were positive for anti-Jo-1 autoantibodies had a significantly stronger effect on the expression of ICAM-1 by HMVEC-L in comparison with sera from healthy controls and patients with other autoantibodies. Purified IgG did not induce ICAM-1 expression. Higher serum levels of sICAM-1 were found in patients with myositis compared with healthy controls. CONCLUSION: EC activation with ICAM-1 expression could contribute to the multiorgan involvement, including the development of myositis and ILD, in patients carrying anti-Jo-1 autoantibodies. The EC-activating factors are not the autoantibodies themselves, but might be systemic factors associated with these autoantibodies.
Place, publisher, year, edition, pages
2009. Vol. 60, no 8, 2524-2530 p.
Medical and Health Sciences
IdentifiersURN: urn:nbn:se:uu:diva-124919DOI: 10.1002/art.24683ISI: 000268973600036OAI: oai:DiVA.org:uu-124919DiVA: diva2:318151