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Immune complexes in juvenile rheumatoid arthritis: a comparison of four methods
Insights
Immune complexes (IC) are elevated in most children with juvenile rheumatoid arthritis (JRA). Different detection methods yield varying results, with ClqSPA and RCA showing higher sensitivity for IC in JRA patients.
Area of Science:
- Pediatric Rheumatology
- Immunology
- Clinical Chemistry
Background:
- Juvenile rheumatoid arthritis (JRA) is a chronic autoimmune disease affecting children.
- Immune complexes (IC) are implicated in the pathogenesis of autoimmune diseases like JRA.
- Accurate detection of IC is crucial for understanding disease activity and guiding treatment.
Purpose of the Study:
- To evaluate the prevalence of elevated immune complexes (IC) in children with juvenile rheumatoid arthritis (JRA).
- To compare the sensitivity of four different IC detection assays in JRA patients.
- To explore correlations between IC levels and clinical parameters in JRA.
Main Methods:
- Fifty-three children diagnosed with JRA were enrolled.
- Four distinct methods were employed for immune complex detection: Clq solid-phase assay (ClqSPA), 2% polyethylene glycol precipitation assay (PEGPA), Raji cell assay (RCA), and conglutinin assay (KA).
- Data were analyzed to determine the percentage of patients with elevated IC levels by each method and across different JRA onset types.
Main Results:
- Seventy-nine percent of JRA patients exhibited elevated IC levels by at least one assay.
- ClqSPA detected elevated IC in 58% of patients, RCA in 50%, and KA in 37%, while PEGPA detected none.
- Elevated IC levels correlated with rheumatoid factor (RF) and antinuclear antibodies (ANA) for KA, and with RF and active disease for ClqSPA.
Conclusions:
- Multiple assays are valuable for detecting immune complexes in juvenile rheumatoid arthritis.
- ClqSPA and RCA appear more sensitive for IC detection in JRA compared to PEGPA and KA.
- The presence of IC, particularly detected by ClqSPA and KA, shows significant correlations with specific autoantibodies and disease activity in JRA.
Abstract:
Fifty-three children with juvenile rheumatoid arthritis (JRA) were tested for immune complexes (IC) by 4 different methods, Clq solid-phase assay (ClqSPA), 2% polyethylene glycol precipitation assay (PEGPA), Raji cell assay (RCA), and the conglutinin assay (KA). Seventy-nine % of JRA patients demonstrated elevated IC levels by at least 1 method. Fifty-eight % of the JRA patients have elevated levels of IC by ClqSPA, 50% by the RCA, 37% by the KA, but 0% by the PEGPA. Seventy-four % of patients with polyarticular-onset, 88% of pauciarticular-onset, and 80% of systemic-onset JRA showed elevated levels of IC by at least 1 method. In the polyarticular-onset group, both in the rheumatoid factor (RF) positive (100%) and RF negative (64%) patients, and in the systemic-onset group (60%) the most elevated levels were demonstrated by the ClqSPA. The most elevated levels were found in the pauciarticular-onset type (69%) by the RCA. The presence of elevated levels of IC by the KA correlated with the presence of RF (p less than 0.01), hidden RF (p less than 0.05), and antinuclear antibodies (p less than 0.005). Elevated levels of IC detected by the ClqSPA correlated with the presence of RF (p less than 0.01), hidden RF (p less than 0.05), and active disease (p less than 0.01).