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Spontaneous and conA-induced suppressor lymphocytes: a comparative study.

C Gattringer, H Huber, G Michlmayr

    Immunobiology
    |January 1, 1981
    PubMed
    Summary
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    Spontaneous suppressor cells in human lymphocytes exhibit inhibitory activity comparable to Concanavalin A-induced suppressor cells. These spontaneous suppressor cells are short-lived and their activity is not dependent on monocytes or B lymphocytes.

    Area of Science:

    • Immunology
    • Cellular Immunology

    Background:

    • Human studies have described various suppressor cells, including suppressor monocytes, Concanavalin A (ConA)-induced suppressor T cells, and short-lived suppressor lymphocytes.
    • Understanding spontaneous suppressor cell activity is crucial for comprehending immune regulation.

    Purpose of the Study:

    • To evaluate spontaneous suppression in a human lymphocyte test system.
    • To compare the activity of spontaneous suppressor cells with ConA-induced suppressor cells.

    Main Methods:

    • Lymphocytes were either stimulated with ConA to induce suppressor cells or treated with mitomycin to generate spontaneous suppressor cells.
    • Both cell preparations were assessed for their ability to inhibit mitogen-induced proliferation of autologous cells.
    • Monocytes and B lymphocytes were depleted to assess their role in spontaneous suppression.

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    Main Results:

    • Spontaneous suppression was not affected by the depletion of monocytes or B lymphocytes.
    • The active cells responsible for spontaneous suppression were found to be short-lived in vitro.
    • Spontaneous suppressor cell activity was comparable to that of ConA-induced suppressor cells.
    • A portion of the increased suppressor activity observed after ConA preculture is due to the loss of spontaneous inhibitory activity in control cultures.

    Conclusions:

    • Spontaneous suppressor cells possess significant inhibitory capacity, comparable to induced suppressor cells.
    • The findings highlight the importance of considering spontaneous suppressor cell activity in immunological assays.
    • The short-lived nature of these cells suggests rapid turnover and dynamic regulation within the immune system.