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  • Title: Complement C3c and C3d in plasma and synovial fluid in rheumatoid arthritis.
    Author: Berkowicz A, Kappelgaard E, Petersen J, Nielsen H, Ingemann-Hansen T, Halkjaer-Kristensen J, Sørensen H.
    Journal: Acta Pathol Microbiol Immunol Scand C; 1983 Dec; 91(6):397-402. PubMed ID: 6608857.
    Abstract:
    By means of recently developed immunochemical assays increased levels of the complement C3c and C3d split products were found in synovial fluids of patients with rheumatoid arthritis (RA) as compared with synovial fluids of patients with traumatic synovitis (TS). In plasma, only the C3d levels were significantly increased compared with plasma levels of patients with TS. Both split products were higher in RA synovial fluids (SF) than in RA plasma. A positive correlation between the C3d concentrations in plasma and the presence of IC in serum was found, and between the C3c levels and the concentration of polymorphonuclear cells in SF of RA patients. Due to differences in turn-over of C3c and C3d determination of plasma C3d levels may be a useful parameter for the evaluation of immunological activity in RA, while measurement of C3c in the synovial fluid may elucidate the actual inflammatory activity in the synovial membranes.
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