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  • Title: Eosinophil involvement in rheumatoid arthritis as reflected by elevated serum levels of eosinophil cationic protein.
    Author: Hällgren R, Feltelius N, Svenson K, Venge P.
    Journal: Clin Exp Immunol; 1985 Mar; 59(3):539-46. PubMed ID: 3987090.
    Abstract:
    Circulating levels of eosinophil cationic protein (ECP), an eosinophil specific granule protein, and numbers of peripheral eosinophils were determined in 42 patients with rheumatoid arthritis. At the time of the investigation the patients were without drug treatment. They had normal blood counts of eosinophils but on average a five-fold increase of the serum ECP values compared with healthy subjects. The intracellular content of ECP in eosinophils isolated from 14 patients was normal. High serum levels of ECP were particularly observed in patients with a disease of rather short duration but with a more aggressive course. Other factors associated with high ECP values were blood eosinophil counts in the upper normal range, high rheumatoid factor titre and increased inflammatory activity as defined by elevated serum haptoglobin and blood platelet counts. No relation was found between serum ECP and circulating immune complexes or serum total IgE. Synovial fluids obtained from 14 patients with rheumatoid arthritis contained very high concentration of ECP; on average nine times higher than those in the circulation of the patients. During corticosteroid but not NSAID therapy serum ECP decreased on average about 50% compared with pre-treatment values. Although eosinophils are not a notable feature of the synovial membrane infiltrate or cellular joint exudate, data obtained indirectly indicates their participation in the inflammatory reaction in RA.
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