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Modulation of cytolytic T cell function by lectins.

M L Toribio, A de la Hera, P Pereira

    Journal of Immunology (Baltimore, Md. : 1950)
    |April 1, 1985
    PubMed
    Summary
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    Lectins inhibit cytotoxic activity in mature human T cells derived from thymocytes, even when not mitogenic. This inhibition is reversible, suggesting lectin modulation of cell surface structures involved in cytolysis.

    Area of Science:

    • Immunology
    • Cell Biology

    Background:

    • Human thymocytes cultured with interleukin-2 (IL-2) mature into cytotoxic T cells.
    • These mature T cells exhibit potent cytotoxic activity against various target cells.

    Purpose of the Study:

    • To investigate the effect of lectins on the cytotoxic activity of mature human T cells.
    • To understand the mechanism by which lectins modulate T cell cytotoxicity.

    Main Methods:

    • Culturing human thymocytes in IL-2 containing supernatants.
    • Adding various lectins (mitogenic and non-mitogenic) to T cell cultures.
    • Assessing cytotoxic activity against NK-sensitive and NK-resistant target cells.
    • Evaluating lectin concentration, timing, and reversibility of inhibition.

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    Main Results:

    • Lectins abrogated cytotoxic activity and enhanced thymocyte proliferation.
    • Inhibition correlated with lectin concentration but not mitogenicity.
    • Lectin presence was required during the final 24 hours of culture for inhibition.
    • Cytotoxicity inhibition was reversible upon lectin removal.
    • Inhibition occurred in both thymocyte and peripheral lymphocyte cultures and was not overcome by lectin-dependent cytotoxicity assays.

    Conclusions:

    • Lectins modulate T cell cytotoxic function, likely by affecting cell surface structures involved in cytolysis.
    • The observed phenomenon cannot be explained by simple steric blockade or overgrowth of non-cytotoxic cells.
    • Reversible modulation of T cell cytotoxicity by lectins offers insights into immune cell regulation.