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Macrophage migration inhibitory factor in patients with juvenile idiopathic arthritis
Cristina Meazza1, Paola Travaglino, Patrizia Pignatti
1University of Pavia, IRCCS Policlinico San Matteo, Italy.
Objective:
To evaluate serum and synovial fluid (SF) levels of macrophage migration inhibitory factor (MIF) and in vitro MIF production by peripheral blood mononuclear cells (PBMCs) in patients with juvenile idiopathic arthritis (JIA).
Methods:
Serum, SF, and culture supernatant levels of MIF were measured by enzyme-linked immunosorbent assay. Production of MIF by PBMCs was investigated by culturing PBMCs in the absence or presence of 2 different concentrations of concanavalin A.
Results:
Serum MIF levels were increased in patients with JIA, and the highest levels were present in patients with systemic-onset JIA. In systemic-onset JIA, serum levels of MIF correlated with the persistence of systemic features and the number of active joints. PBMCs from patients with systemic-onset JIA, when cultured under unstimulated conditions or at suboptimal stimulation, released higher amounts of MIF compared with those from patients with oligoarticular-onset JIA or healthy controls. MIF levels in the SF of patients with systemic-onset JIA were significantly higher than those in patients with oligoarticular-onset JIA. In individual joints, in both systemic-onset JIA and oligoarticular-onset JIA, SF MIF levels were inversely correlated with the duration of the clinical remission induced by intraarticular administration of triamcinolone hexacetonide.
Conclusion:
MIF appears to be a relevant cytokine in the pathogenesis of JIA, particularly in systemic-onset JIA.
Insights
Macrophage migration inhibitory factor (MIF) is elevated in juvenile idiopathic arthritis (JIA), especially systemic-onset JIA. Higher MIF levels correlate with disease activity and reduced remission duration, suggesting its role in JIA pathogenesis.
Area of Science:
- Immunology
- Rheumatology
- Cytokine Research
Background:
- Juvenile idiopathic arthritis (JIA) is a complex autoimmune disease.
- Macrophage migration inhibitory factor (MIF) is a pro-inflammatory cytokine with a potential role in autoimmune conditions.
Purpose of the Study:
- To investigate serum and synovial fluid (SF) levels of MIF in JIA patients.
- To assess in vitro MIF production by peripheral blood mononuclear cells (PBMCs) in JIA.
- To explore the correlation of MIF levels with clinical parameters of JIA.
Main Methods:
- Enzyme-linked immunosorbent assay (ELISA) was used to quantify MIF levels in serum and SF.
- PBMCs were cultured with and without concanavalin A to measure MIF production.
- Correlations between MIF levels and clinical features of JIA were analyzed.
Main Results:
- Serum MIF levels were significantly higher in JIA patients, particularly those with systemic-onset JIA.
- PBMCs from systemic-onset JIA patients produced more MIF in vitro.
- SF MIF levels were higher in systemic-onset JIA than oligoarticular-onset JIA and inversely correlated with remission duration after intraarticular corticosteroid treatment.
Conclusions:
- MIF is implicated in the pathogenesis of JIA, especially the systemic subtype.
- MIF may serve as a biomarker for disease activity and treatment response in JIA.