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[IgA rheumatoid factor formation in connection with complement activation and circulating immune complexes in chronic

W Kullich1

  • 1Ludwig-Boltzmann-Institut für Rehabilitation interner Erkrankungen, Saalfelden.

Wiener Klinische Wochenschrift
|January 1, 1994
PubMed

The IgA-rheumatoid factor (IgA-RF) as well as the complement component C3a in plasma and serum levels of circulating immune complexes (CIC) (C1q binding assay and Raji Cell Replacement assay) were measured with enzyme immunoassays in 81 patients with established rheumatoid arthritis. The serum levels of the complement component C3a were found significantly higher (p < 0.02) in the cases with high IgA-RF (> 6 AU/ml) than in those with low IgA-RF. Distinct significant correlations (r = 0.38; p < 0.001) were observed between production of IgA-RF and activation of the complement fragment C3a, which might be associated with production of antibodies and with complement activation accompanying inflammatory processes. A weaker correlation between CIC and IgA-RF-levels indicates CIC not to be closely related to the production of IgA-RF in the examined R.A.-patients. However, an indirect connection by the way of inflammation and activation of T-cells is possible.

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