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Keywords:

  • activity;
  • apoptosis;
  • galectin-3;
  • juvenile idiopathic arthritis;
  • severity

Abstract

Objectives:  Galectin-3 is a carbohydrate-binding protein that plays many important regulatory roles in inflammation, immunity and cancers. Recent studies indicate that galectin-3 plays a role in rheumatoid arthritis (RA) pathogenesis and progression. Therefore, we sought to characterize the expression pattern and role of galectin-3 in juvenile idiopathic arthritis (JIA) and to explore whether galectin-3 investigated in serum and synovial fluid was associated with clinical, laboratory and radiological variables of JIA disease activity and severity.

Methods:  Levels of galectin-3 in serum and synovial fluid from patients with JIA and controls were determined by enzyme-linked immunosorbent assay.

Results:  Median (interquartile range) serum galectin-3 concentrations (ng/mL) were increasingly higher across the following groups: healthy controls (8.1 [4.9–16.7]), total JIA children with inactive disease (18.6 [9.7–28.8], = 0.00039 vs. controls) and active disease (35.8 [15.8–60.8], = 0.000012 vs. controls) (inactive vs. active, = 0.00016). Highest serum expression was found in polyarthritic children. Galectin-3 concentrations in paired sera and synovial fluid samples could be related to each other. Serum and synovial concentrations of galectin-3 were positively correlated with total number of joints with active arthritis and with overall articular severity score. Patients with Larsen index and total radiographic score ≥ 1 had significant higher serum galectin-3 levels than patients with indices and scores < 1.

Conclusions:  These results suggest that serum levels of galectin-3 are increased in active JIA children and galectin-3 can be a new biomarker indicating JIA disease activity, severity and progression, although its increment is not disease-specific.