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Isolation of Mouse Peritoneal Cavity Cells
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Functional active complement components secreted by guinea pig peritoneal macrophages

V Brade, G Kreuzpaintner

    Immunobiology
    |April 1, 1982
    PubMed
    Summary
    This summary is machine-generated.

    Macrophages secrete complement components C1-C4, C2, C3, Factor P, D, and B, enabling complement activation. This local production supports macrophage roles in inflammation and antimicrobial defense.

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    Area of Science:

    • Immunology
    • Cell Biology

    Background:

    • The complement system is crucial for innate immunity.
    • Macrophages are key immune cells involved in host defense.

    Purpose of the Study:

    • To investigate the complement components secreted by macrophages.
    • To determine the role of macrophages in complement activation.

    Main Methods:

    • Cultured macrophages were analyzed for complement protein secretion.
    • Functional assays were used to assess complement activation.
    • Antibody-coated sheep erythrocytes (EA) and zymosan were used to induce complement activation.

    Main Results:

    • Macrophages secreted functional complement components C1, C4, C2, C3, Factor P, D, and B.
    • Spontaneous and induced C3 activation was observed in macrophage culture supernatants.
    • The alternative pathway of complement activation was functional.

    Conclusions:

    • Macrophages locally produce essential complement factors, including C3 and its activators.
    • These findings suggest macrophages play a significant role in local complement-mediated immunity.
    • Local complement production by macrophages is vital for inflammation and antimicrobial defense.