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Related Experiment Videos

A function for human T200 in natural killer cytolysis.

R L Sparrow, I F McKenzie

    Transplantation
    |August 1, 1983
    PubMed
    Summary

    An antihuman T200 antibody, F2.5, inhibits natural killer (NK) cell lysis of target cells. This study identifies a role for T200 in NK cell recognition and binding, revealing a functional NK cell receptor.

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    Area of Science:

    • Immunology
    • Cell Biology
    • Molecular Biology

    Background:

    • Natural killer (NK) cells are crucial for innate immunity, mediating lysis of target cells.
    • The specific receptors and molecular interactions governing NK cell target recognition remain incompletely understood.
    • T200 is a cell surface protein expressed on various immune cells, but its precise function in NK cell cytotoxicity is not well-defined.

    Purpose of the Study:

    • To investigate the role of the antihuman T200 monoclonal antibody, F2.5, in modulating NK cell-mediated cytotoxicity.
    • To determine if T200 is involved in the recognition and binding of NK cells to target cells.
    • To identify a potential functional receptor for NK cells.

    Main Methods:

    • In vitro assays measuring natural killer cell-mediated lysis of K562 target cells.
    • Testing the inhibitory effect of the F2.5 antibody on NK cell cytotoxicity.
    • Evaluating the impact of F2.5 antibody-coated effector cells on binding to K562 target cells.
    • Assessing the F2.5 antibody's effect on cytotoxic T lymphocyte responses.

    Main Results:

    • The F2.5 antibody specifically inhibited in vitro human natural killer cell-mediated lysis of K562 target cells.
    • No inhibition was observed in the cytotoxic T lymphocyte response to autologous virus-infected cells.
    • Direct binding studies showed reduced binding capacity of F2.5 antibody-coated effector cells to K562 target cells.
    • These findings suggest T200 plays a role in NK cell target recognition and binding.

    Conclusions:

    • The T200 molecule is implicated in the functional recognition and binding of natural killer cells to their targets.
    • This research describes the first identified role for human T200 in NK cell activity.
    • A functional natural killer cell receptor has been identified through the use of the F2.5 antibody.

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