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Related Experiment Videos

An electron microscope study of three-component immune complexes.

J D Almeida, A F Bradburne

    Journal of Medical Virology
    |January 1, 1984
    PubMed
    Summary

    Secondary immune reactants can cross-link unrelated immune complexes, forming visible three-component complexes. This finding impacts understanding neutralization enhancement and potential false positives in immunoassays.

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    Area of Science:

    • Immunology
    • Electron Microscopy
    • Virology

    Background:

    • Three-component complexes involve antigen, antibody, and secondary immune reactants.
    • Secondary reagents like anti-IgG, rheumatoid factor (RF), and complement can participate.

    Purpose of the Study:

    • To examine the visual appearance of three-component complexes using immune electron microscopy.
    • To understand the role of secondary immune reactants in forming mixed immune complexes.
    • To relate complex formation to neutralization enhancement and false positive immunoassays.

    Main Methods:

    • Utilized immune electron microscopy to visualize complex formation.
    • Employed antigen from two different viruses, specific antibodies, and secondary immune reactants.
    • Analyzed the distinct visual characteristics of complexes formed by different secondary reagents.

    Main Results:

    • Secondary reagents (anti-IgG, RF, complement) cross-linked antigenically unrelated immune complexes.
    • Distinct visual appearances of mixed complexes were observed for each secondary reagent.
    • The formation of these mixed complexes was visually confirmed.

    Conclusions:

    • Secondary immune reactants can mediate the formation of visually distinguishable mixed immune complexes.
    • The appearance of these complexes is linked to neutralization enhancement effects.
    • Understanding these complexes is crucial for interpreting results in solid-phase immunoassays and avoiding false positives.

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