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Targeted antigen presentation using crosslinked antibody heteroaggregates.

D P Snider, D M Segal

    Journal of Immunology (Baltimore, Md. : 1950)
    |September 1, 1987
    PubMed
    Summary
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    Researchers developed antibody heteroaggregates to target protein antigens to antigen-presenting cells, significantly enhancing antigen presentation. This novel method shows promise for stimulating immune responses in vivo.

    Area of Science:

    • Immunology
    • Cell Biology
    • Biotechnology

    Background:

    • Antigen presentation is crucial for initiating adaptive immune responses.
    • Targeting antigens to specific cell surface molecules can modulate immune cell activation.

    Purpose of the Study:

    • To investigate the efficacy of antibody heteroaggregates in targeting protein antigens to antigen-presenting cells (APCs).
    • To assess the impact of targeted antigen delivery on antigen presentation efficiency.

    Main Methods:

    • Antibody heteroaggregates were constructed by crosslinking antibodies against protein antigens to antibodies recognizing APC surface structures.
    • Antigen presentation was quantified by measuring lymphokine release from antigen-specific T cell hybridomas.
    • Targeting was performed on various APCs, including B cell lines and splenic cells, to different surface molecules like MHC, IgD, and Fc gamma receptors.

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    Main Results:

    • Antibody heteroaggregates enhanced antigen presentation by 100- to 1000-fold compared to untargeted antigen.
    • Enhanced presentation was observed when targeting MHC class I/II, surface immunoglobulin, and Fc gamma receptors on B cells, and MHC class I/II on spleen cells.
    • Targeting to Fc gamma R on B cells or spleen cells did not enhance presentation.
    • The enhancement correlated with the binding capacity of the antibody heteroaggregates.
    • Antigen presentation was antigen-specific and MHC class II (I-A) restricted.

    Conclusions:

    • Antibody heteroaggregates provide a potent method for enhancing antigen presentation by targeting antigens to APCs.
    • This approach offers a novel strategy for stimulating antigen-specific immune responses in vivo.
    • The choice of target structure on APCs influences the effectiveness of antigen targeting.