Study of pro-inflammatory (TNF-α, IL-1α, IL-6) and T-cell-derived (IL-2, IL-4) cytokines in plasma and synovial fluid of patients with juvenile chronic arthritis: Correlations with clinical and laboratory parameters
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Acute phase proteins, synovial fluid (SF) cellular infiltrates, pro-inflammatory (TNF-α, IL-1α, IL-6) and Th1 (IL-2) and Th2 (IL-4) derived cytokine levels both in plasma and SF were examined in pauciarticular and polyarticular juvenile chronic arthritis (JCA) patients during the active (n=22) and inactive (n=14) period in order to determine pathogenic mechanisms and correlations between cytokines and laboratory parameters showing disease activity. The erythrocyte sedimentation rate (ESR), serum C-reactive protein (CRP) and IgG concentrations were found to be significantly elevated in the active period of JCA. In pauciarticular JCA patients, when compared with their peripheral blood lymphocyte subpopulations, SF CD3+ cells (73.1%) and HLA-DR+ active T cells (22.5%) were found to be significantly increased. In the active period of JCA, plasma TNF-α and IL-6 concentrations were significantly elevated. Plasma IL-2 and IL-4 levels were not elevated and were found to be similar to those in the inactive phase and in healthy controls. SF IL-6, TNF-α and IL-1α levels were extremely high in all the patients. SF IL-4 and IL-2 levels were all undetectable. There was a significant correlation between ESR values and plasma IL-6 levels and between serum CRP levels and plasma IL-6 and TNF-α concentrations. In conclusion, increased local production of pro-inflammatory cytokines appears to account for the articular manifestations of JCA. The impaired production of anti-inflammatory Th2-derived cytokines (IL-4) seems to cause increased production of inflammatory cytokines acting on the balance between them. The deficit in IL-2 production was not suggested to be primarily involved in the pathogenesis. In addition, not only CRP and ESR values, but also plasma IL-6 and TNF-α concentrations may be used as markers of disease activity.
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- Study of pro-inflammatory (TNF-α, IL-1α, IL-6) and T-cell-derived (IL-2, IL-4) cytokines in plasma and synovial fluid of patients with juvenile chronic arthritis: Correlations with clinical and laboratory parameters
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