Abstract
To investigate the serum level of soluble CD27 (sCD27) and its potential clinical significance in rheumatoid arthritis (RA). Serum sCD27 levels in RA patients, idiopathic inflammatory myopathy (IIM) patients, systemic lupus erythematosus (SLE) patients and healthy controls (HCs) were detected by enzyme-linked immunosorbent assay. The medical information and laboratory data of the patients were collected. Serum sCD27 levels in RA patients with different clinical features were analysed, as was the correlation between the clinical data and serum sCD27 levels. Independent samples t test, the Mann-Whitney U-test or Wilcoxon signed-rank test, and Spearman correlation were used for statistical analysis. Levels of sCD27 were elevated in RA patients (3898 [2525, 5834] pg/mL) compared with IIM patients (2467 [1939, 3324] pg/mL) or HCs (1659 ± 648 pg/mL) (p 0.001). In addition, serum sCD27 levels correlated with age, erythrocyte sedimentation rate, C-reactive protein (CRP), rheumatoid factor (RF), immunoglobulin A, immunoglobulin G, complement 4 and disease activity score in 28 joints in RA patients. Levels of sCD27 were higher in RF-positive RA patients (6054 ± 5842 pg/mL) than in RF-negative patients (3902 ± 2098 pg/mL), and a similar finding was also observed in anti-cyclic citrullinated peptide (anti-CCP) antibody-positive (5810 ± 5671 pg/mL) and anti-CCP-negative (4183 ± 2187 pg/mL) RA patients. Serum ESR, RF, IgA, IgG levels and DAS28-CRP were elevated in RA patients with higher sCD27 levels than in those with lower sCD27 levels (p<0.01). Serum sCD27 might be a promising biomarker that reflects both disease activity and humoral immunity activity in RA.
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