Objective: Analysis of cytokine production in patients with acute and chronic reactive arthritis (AcReA/ChrReA) in order to search for new treatment possibilities.
Methods: Cytokine production by peripheral blood and synovial fluid mononuclear cells (PBMCs/SFMCs) of 28 patients with AcReA, 27 patients with ChrReA, 26 patients with rheumatoid arthritis (RA) and 31 healthy controls was analysed by enzyme-linked immunosorbent assay (ELISA) and flow-cytometry. Production of tumour necrosis factor-alpha (TNF-alpha), interferon-gamma (IFN-gamma) and interleukin (IL)-10 was measured by ELISA, while the percentages of TNF-alpha-, IFN-gamma- and IL-4-positive CD3+ cells were determined in the same groups of patients and healthy subjects using flow cytometry.
Results: Spontaneous TNF-alpha production observed in PBMCs of ChrReA, but not of AcReA, patients was significantly higher (P<0.001) than in healthy controls. The percentages of TNF-alpha-positive CD3+ blood cells in ChrReA exceeded that of RA patients and healthy controls (P<0.05 and P<0.001, respectively). Also, the percentages of IFN-gamma-positive CD3+ cells were significantly higher in peripheral blood and synovial fluid of ChrReA patients (P<0.05 and P<0.05, respectively) as compared with AcReA. In ChrReA spontaneous IL-10 production in PBMCs was similar to that observed in healthy controls, while in RA and AcReA the production of IL-10 was significantly increased (P<0.05 and P<0.05, respectively). IL-4 production was low in all study groups with no significant differences detected.
Conclusions: High production of TNF-alpha and IFN-gamma detected in ChrReA supports the possible use of anti-TNF-alpha treatment in ChrReA.