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Related Experiment Videos

T cell signals in tolerance

H N Claman

    Annals of the New York Academy of Sciences
    |January 1, 1982
    PubMed
    Summary

    T cell activation requires two signals: antigen (Signal 1) and a nonspecific stimulus (Signal 2). Tolerance is induced when Signal 1 is presented without Signal 2, while both signals boost responses in primed systems.

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    Area of Science:

    • Immunology
    • Cellular immunology
    • T cell activation

    Background:

    • T cell activation and immune priming necessitate at least two signals: specific antigen (Signal 1) and a nonspecific stimulus (Signal 2).
    • These signals are typically associative but can be delivered independently, with antigen properties and host processing influencing Signal 2 delivery.

    Purpose of the Study:

    • To elucidate the mechanisms of T cell activation, tolerance induction, and desensitization in contact sensitivity.
    • To explore the roles of Signal 1 and Signal 2 in both initiating and regulating T cell-mediated immune responses.

    Main Methods:

    • The study discusses the principles of T cell activation and tolerance based on signal requirements.
    • It examines the impact of antigen presentation and host processing on immune responses.
    • The role of anti-idiotype antibodies and antigen alone in desensitization is considered.

    Main Results:

    • Tolerance in unprimed systems is induced by Signal 1 presentation without Signal 2, leading to suppressor mechanism activation and T helper-dependent (TDH) cell inactivation.
    • In primed systems, both Signal 1 and Signal 2 enhance the immune response.
    • Desensitization in primed systems can be achieved via "off signals" from anti-idiotype antibodies, which activate suppressor mechanisms to down-regulate TDH cells.

    Conclusions:

    • Antigen alone (Signal 1) can down-regulate TDH cells, but it is not yet an effective method for desensitizing primed T cells.
    • Understanding the dual role of signals in T cell activation is crucial for manipulating immune responses, particularly in allergic contact sensitivity.

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