The role of mitogenic lectins in T-cell triggering (original) (raw)

Nature volume 280, pages 239–241 (1979)Cite this article

Abstract

THE process of T-lymphocyte activation requires the participation of metabolically active non-_θ_-bearing accessory cells1. As first conclusively shown by Habu and Raff2, this requirement is also true of lectin-dependent triggering. Thus, T-cell activation by mitogenic lectins depends on the presence of la-positive non-T cells3,4. The mere binding of lectins such as concanavalin A (Con A) to the surface membrane of T cells does not trigger the cells to go through the mitotic cycle. This can only be achieved by the activity of growth factors present in conditioned media (CM) from Con A-stimulated cell cultures5. Such growth factors, however, cannot activate normal, resting T cells, although they are competent to maintain activated T cells in exponential growth for indefinite periods of time6. Hence, to be mitogenic a lectin must not only induce the in situ production of T-cell growth factors, but must also render resting T cells sensitive to the mitogenic activity of these growth factors. In this report we demonstrate that the binding of Con A to purified T cells can in a relatively short time, modify their functional sensitivity to growth factors, even though this binding is not sufficient to stimulate them to proliferate.

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Authors and Affiliations

  1. Department of Biochemistry, Arrhenius Laboratory, University of Stockholm, S-106 91, Stockholm, Sweden
    EVA-LOTTA LARSSON
  2. Basel Institute for Immunology,
    EVA-LOTTA LARSSON
  3. Basel Institute for Immunology, Postfach, CH-4005, Basel, Switzerland
    ANTONIO COUTINHO

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  1. ANTONIO COUTINHO
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LARSSON, EL., COUTINHO, A. The role of mitogenic lectins in T-cell triggering.Nature 280, 239–241 (1979). https://doi.org/10.1038/280239a0

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