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Circulating antigen-antibody complexes in onchocerciasis

M W Steward, B Sisley, C D Mackenzie

    Clinical and Experimental Immunology
    |April 1, 1982
    PubMed
    Summary
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    Circulating antigen-antibody complexes were found in 50% of onchocerciasis patients, unrelated to disease severity. Both IgM and IgG were common in these complexes, but IgE was present in a few.

    Area of Science:

    • Immunology
    • Parasitology
    • Onchocerciasis Research

    Background:

    • Onchocerciasis, a parasitic disease, is known to elicit a strong immune response.
    • The role of circulating immune complexes in the pathogenesis of onchocerciasis remains incompletely understood.

    Purpose of the Study:

    • To investigate the presence and characteristics of circulating antigen-antibody complexes in patients with onchocerciasis.
    • To determine the correlation between immune complex levels and clinical parameters like microfilarial load and antibody titers.

    Main Methods:

    • Utilized Clq and conglutinin solid-phase binding assays to detect antigen-antibody complexes in patient sera.
    • Analyzed the association of complex levels with microfilarial load and specific anti-onchocercal antibody titers.

    Related Experiment Videos

  • Characterized the immunoglobulin isotypes (IgM, IgG, IgE) involved in the detected complexes.

    • Main Results:

    • Demonstrable circulating complexes were detected in 50% of the investigated onchocerciasis patients.
    • Immune complex levels showed no correlation with microfilarial load or specific antibody titers.
    • Both IgM- and IgG-containing complexes were frequently observed, with no correlation between their levels.
    • Evidence of IgE in complexes was found in a minority of patients.

    Conclusions:

    • Circulating antigen-antibody complexes are present in a subset of onchocerciasis patients but do not correlate with disease severity markers.
    • While IgM and IgG are commonly involved, their levels are not interdependent within these complexes.
    • The presence of IgE in immune complexes suggests a potential role in a subset of patients, warranting further investigation.