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Modulation of lymphocyte mitogenesis.

J L Wang, D A McClain, G M Edelman

    Proceedings of the National Academy of Sciences of the United States of America
    |May 1, 1975
    PubMed
    Summary
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    Tetrameric concanavalin A (Con A) and dimeric succinyl-Con A reveal distinct stimulatory and inhibitory signals in lymphocyte mitogenesis. These signals can be independently manipulated, suggesting separate pathways regulate cell proliferation and inhibition.

    Area of Science:

    • Immunology
    • Cell Biology
    • Biochemistry

    Background:

    • Lymphocyte activation and proliferation are crucial immune responses.
    • Concanavalin A (Con A) is a well-established mitogen for lymphocytes.
    • The dose-dependent effects of Con A on lymphocyte proliferation are complex, involving both stimulation and inhibition.

    Purpose of the Study:

    • To investigate the distinct roles of stimulatory and inhibitory signals in lymphocyte mitogenesis induced by Con A.
    • To explore the independent modulation of these signals using different forms of Con A and co-stimulants.
    • To elucidate the mechanisms underlying Con A-mediated lymphocyte proliferation and inhibition.

    Main Methods:

    • Comparative analysis of tetrameric Con A and dimeric succinyl-Con A in stimulating normal lymphocytes and lymphoma cells.

    Related Experiment Videos

  • Assessment of synergistic effects using lectins, phorbol esters, and calcium ionophores.
  • Evaluation of inhibitory effects by co-administering Con A with phorbol ester and succinyl-Con A.

    • Main Results:

    • Both tetrameric Con A and dimeric succinyl-Con A modulate lymphocyte mitogenesis through stimulatory and inhibitory signals.
    • Synergistic stimulation of lymphocytes was observed with combinations of mitogens.
    • High doses of Con A induced inhibition, which could be mimicked by phorbol ester co-administration, an effect not seen with succinyl-Con A.
    • Succinyl-Con A reduced the dose required for Con A-induced inhibition, suggesting independent signal pathways.

    Conclusions:

    • Lymphocyte mitogenesis is regulated by distinct stimulatory and inhibitory signals.
    • These signals can be independently manipulated, offering potential for targeted immunomodulation.
    • The inhibitory signal is likely mediated by cell surface receptor mobility regulation.