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Staphylococcal enterotoxin induced mitogenesis: toxin binding and cell-cell interactions.

E S Buxser, P F Bonventre, D L Archer

    Microbiologica
    |July 1, 1983
    PubMed
    Summary

    Staphylococcal enterotoxin A (SEA) binds to both T- and B-lymphocytes, with B-cells showing higher capacity. Macrophages, though not directly binding SEA, enhance SEA-induced lymphocyte mitogenesis, highlighting immune cell interactions.

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    Area of Science:

    • Immunology
    • Cell Biology

    Background:

    • Staphylococcal enterotoxin A (SEA) is a known T-cell mitogen.
    • Understanding SEA's interaction with immune cells is crucial for elucidating its immunological effects.

    Purpose of the Study:

    • To analyze the binding characteristics of 125I-labelled SEA to murine lymphoid cell subpopulations.
    • To investigate the role of macrophages and B-lymphocytes in SEA-induced mitogenesis.

    Main Methods:

    • Radio-labelled SEA (125I-SEA) binding assays on murine spleen and thymus lymphocytes.
    • Analysis of SEA interaction with peritoneal exudate cells (PECs) as a macrophage source.
    • Co-culture experiments to assess mitogenic stimulation in the presence of lymphocytes and macrophages.

    Main Results:

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    • Specific binding sites for SEA were identified on both T- and B-lymphocytes.
    • B-lymphocytes exhibited a greater binding capacity for SEA compared to T-lymphocytes.
    • Macrophages did not directly bind SEA but incorporated it via endocytosis and stimulated lymphocyte mitogenesis.
    • Maximum mitogenic stimulation required co-exposure of both macrophages and lymphocytes to SEA.
    • Splenic B-lymphocytes enhanced the mitogenic response of T-cells to SEA.

    Conclusions:

    • SEA interacts with specific binding sites on both T- and B-lymphocytes, with a preference for B-cells.
    • Macrophages play a crucial role in mediating SEA-induced lymphocyte mitogenesis, independent of direct binding.
    • B-lymphocytes contribute significantly to SEA-induced T-cell mitogenesis, indicating complex cellular crosstalk.
    • SEA-mediated immunological effects likely result from intricate interactions among diverse immune cell populations.