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Cell surface structures involved in T cell activation.

D W Lancki, D I Ma, W L Havran

    Immunological Reviews
    |October 1, 1984
    PubMed
    Summary
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    This study explores T cell activation requirements using four models, revealing that higher affinity antigen receptors reduce the importance of associative recognition structures like Lyt-2 and L3T4 for T cell activation. Monoclonal antibodies targeting antigen receptors or associated structures can augment T cell proliferation. Keywords: T cell activation, antigen receptors, Lyt-2, L3T4, monoclonal antibodies.

    Area of Science:

    • Immunology
    • Cell Biology

    Background:

    • T cell activation is a complex process involving antigen recognition and co-stimulatory signals.
    • Understanding the roles of associative recognition structures (e.g., Lyt-2, L3T4) is crucial for deciphering T cell function.

    Purpose of the Study:

    • To investigate the requirements for T cell activation using distinct model systems.
    • To elucidate the involvement of associative recognition structures in T cell-mediated cytolysis and proliferation.
    • To identify molecules that can modulate T cell responses.

    Main Methods:

    • Utilized a cytotoxic T lymphocyte (CTL) clone (L3) to study Lyt-2 involvement in cytolysis against alloantigen-bearing cells and hybridoma cells expressing clonotypic antibodies.
    • Employed cloned helper T lymphocytes (HTL) selected for varying affinities to assess the role of L3T4 in T cell activation.

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  • Screened monoclonal antibodies for their ability to augment T cell proliferation in response to suboptimal Interleukin-2 (IL-2).

    • Main Results:

    • Cytolysis mediated by the L3 CTL clone was differentially inhibited by anti-Lyt-2 antibody depending on the target cell's antigen presentation.
    • Higher affinity antigen receptors on cloned HTL reduced the importance of the L3T4 structure for T cell activation.
    • Several monoclonal antibodies, potentially targeting the antigen receptor or Leu-4/T3 complex, augmented IL-2-induced T cell proliferation.

    Conclusions:

    • The avidity of T cell receptor-antigen interaction influences the requirement for associative recognition structures in T cell activation.
    • T cells with higher affinity antigen receptors may rely less on co-stimulatory molecules like L3T4.
    • Specific monoclonal antibodies can modulate T cell responses, offering potential therapeutic avenues.