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Related Experiment Videos

A human soluble suppressor factor affecting lymphocyte responses in vitro.

L Shou, S A Schwartz, R A Good

    Proceedings of the National Academy of Sciences of the United States of America
    |October 1, 1980
    PubMed
    Summary

    A soluble suppressor factor (SSF) from human lymphocytes inhibits immune cell proliferation and immunoglobulin production. This factor regulates immune responses and acts even when added late in culture, showing its significant impact on cellular immunity.

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    Area of Science:

    • Immunology
    • Cell Biology

    Background:

    • Normal human peripheral blood lymphocyte cultures produce a soluble suppressor factor (SSF).
    • This factor demonstrates suppressive activity against key immune responses in vitro.

    Purpose of the Study:

    • To characterize the suppressive activity and properties of SSF.
    • To understand the mechanism and timing of SSF action in immune regulation.

    Main Methods:

    • Culturing normal human peripheral blood lymphocytes.
    • Assessing suppressive activity of SSF supernatant on lymphocyte proliferation (concanavalin A, MLC) and immunoglobulin synthesis (pokeweed mitogen).
    • Evaluating SSF stability at different temperatures and its effect when added at various time points in culture.

    Main Results:

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    • SSF effectively suppressed lymphocyte proliferation in response to concanavalin A and alloantigens in MLC.
    • Maximal suppression of MLC proliferative response occurred when SSF constituted 20% of the culture medium.
    • Suppression occurred at the proliferative stage, independent of cytotoxicity, and was effective even when SSF was added as late as day 4.
    • SSF was stable at 56°C for 30 minutes but inactivated at higher temperatures.

    Conclusions:

    • SSF is a potent regulator of human immune responses, specifically targeting lymphocyte proliferation and immunoglobulin synthesis.
    • Its ability to suppress late in culture suggests a significant role in modulating the magnitude and duration of immune reactions.
    • Further investigation into SSF could reveal therapeutic targets for immune modulation.