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Cell surface structures required for B-cell activation with haptenated syngeneic cells.

T Ramos

    Scandinavian Journal of Immunology
    |May 1, 1983
    PubMed
    Summary

    MHC class I (H-2) antigens on stimulator cells are crucial for inducing B-cell responses to haptens like fluorescein isothiocyanate (FITC). H-2-less cells fail to trigger antibody synthesis, highlighting the necessity of these antigens for B-cell activation.

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    Area of Science:

    • Immunology
    • Cell Biology

    Background:

    • B-cell activation requires specific cell surface antigens for immune responses.
    • The role of H-2 coded antigens in B-cell responsiveness to haptenated cells is not fully understood.

    Purpose of the Study:

    • To investigate the necessity of H-2 coded antigens on stimulator cells for inducing B-cell responsiveness against haptenated syngeneic cells.
    • To analyze the impact of cell surface modifications on B-cell activation.

    Main Methods:

    • Utilized H-2-less F9 teratocarcinoma cell lines and normal spleen cells.
    • Cells were labeled with fluorescein isothiocyanate (FITC) and treated with glutaraldehyde or trypsin.
    • Assessed the induction of hapten-specific antibody synthesis and B-cell unresponsiveness.
    • Evaluated the blocking of T-cell-mediated cytotoxicity.

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    Main Results:

    • FITC-labeled F9 cells, lacking H-2 antigens, could not induce hapten-specific antibody synthesis.
    • Treatment of stimulator cells with glutaraldehyde or trypsin, before or after hapten labeling, abrogated the induction of antibody synthesis.
    • FITC-labeled glutaraldehyde-treated syngeneic lymphocytes failed to induce hapten-specific B-cell unresponsiveness.
    • Trypsin- or glutaraldehyde-treated cold targets effectively blocked T-cell-mediated cytotoxicity.

    Conclusions:

    • H-2 coded antigens are essential for B-cell activation against haptenated syngeneic lymphocytes.
    • Cell surface modifications like glutaraldehyde or trypsin treatment interfere with B-cell activation pathways.
    • These findings underscore the critical role of MHC class I molecules in initiating T-dependent B-cell responses.