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Bone marrow suppressor B cells in vitro.

B B Fuchs, R M Khaitov, R V Petrov

    Immunology
    |December 1, 1978
    PubMed
    Summary
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    Bone marrow cells suppress the immune response by inhibiting antibody formation. This suppression is mediated by immature B lymphocyte precursors, not mature cells, impacting the generation of antibody-forming cells.

    Area of Science:

    • Immunology
    • Cell Biology

    Background:

    • Bone marrow contains cells that can influence immune responses.
    • The role of specific bone marrow cell populations in immune suppression requires further elucidation.

    Purpose of the Study:

    • To identify the specific bone marrow cell type responsible for suppressing the generation of antibody-forming cells.
    • To investigate the characteristics of immunosuppressive bone marrow cells.

    Main Methods:

    • Co-culture of syngeneic splenocytes with bone marrow cells from intact or hydroxyurea-treated mice.
    • Analysis of antibody-forming cell generation against sheep red blood cells (SRBC).
    • Flow cytometry to identify cell surface markers (immunoglobulins, MBLA) and cell proliferation ([3H]-thymidine incorporation).

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    Main Results:

    • Bone marrow cells from intact mice suppressed anti-SRBC antibody production in splenocyte cultures.
    • Removal of immunoglobulin-bearing cells significantly reduced this suppressive activity.
    • Hydroxyurea treatment depleted blast cells and reduced proliferation in bone marrow, eliminating suppressive activity.

    Conclusions:

    • Immature B lymphocyte precursors in bone marrow mediate the suppression of the immune response to SRBC in vitro.
    • These precursor cells are characterized by a lack of surface immunoglobulins and reduced proliferation.