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Related Experiment Videos

Gonococcal protein I-specific opsonic IgG in normal human serum.

S K Sarafian, M R Tam, S A Morse

    The Journal of Infectious Diseases
    |December 1, 1983
    PubMed
    Summary

    Normal human serum (NHS) contains IgG antibodies that inhibit monoclonal antibody binding to Neisseria gonorrhoeae protein I. This inhibition, mediated by the Fab fragment, suggests specific IgG recognition of protein I, impacting gonococcal immune evasion strategies.

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    Area of Science:

    • Immunology
    • Microbiology
    • Bacteriology

    Background:

    • Neisseria gonorrhoeae possesses surface proteins, including protein I, that are targets for antibody recognition.
    • Normal human serum (NHS) can influence bacterial-host interactions through its complement and antibody components.
    • Understanding antibody interactions with gonococcal surface antigens is crucial for developing effective vaccines and therapies.

    Purpose of the Study:

    • To investigate the inhibitory effect of normal human serum (NHS) on the binding of monoclonal antibodies to protein I of Neisseria gonorrhoeae.
    • To identify the immunoglobulin class and specific antibody fragments responsible for this observed inhibition.
    • To elucidate the mechanism by which NHS antibodies interact with gonococcal surface structures.

    Main Methods:

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    • Enzyme-linked immunosorbent assay (ELISA) inhibition assays were employed to measure antibody binding.
    • Monoclonal antibodies targeting protein I and protein III of Neisseria gonorrhoeae were used.
    • Purified protein I was utilized for absorption experiments.
    • Fab fragments of IgG were generated and tested for inhibitory activity.
    • Opsonization assays were performed to assess the functional activity of NHS IgG.

    Main Results:

    • Pooled and individual NHS samples significantly inhibited the binding of monoclonal antibodies to protein I across various Neisseria gonorrhoeae strains.
    • Immunoglobulin G (IgG) was identified as the primary inhibitory component in NHS.
    • Only the Fab fragment of IgG demonstrated inhibitory activity, indicating specific binding to protein I.
    • Absorption of NHS with purified protein I abolished the inhibition of a protein III-specific monoclonal antibody, ruling out protein III involvement.
    • Lipopolysaccharide-specific IgG in NHS did not contribute to the inhibition of protein I binding.
    • NHS IgG exhibited opsonic activity, which was abrogated by pre-coating gonococci with protein I-specific Fab fragments.

    Conclusions:

    • Normal human serum contains specific IgG antibodies directed against Neisseria gonorrhoeae protein I.
    • The inhibitory effect is mediated by the Fab fragment of IgG, suggesting direct binding to protein I epitopes.
    • These findings highlight a potential mechanism of immune evasion by Neisseria gonorrhoeae, where host antibodies may interfere with specific immune responses targeting critical surface structures.