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Related Experiment Videos

Functional activity of enucleated human polymorphonuclear leukocytes.

D Roos, A A Voetman, L J Meerhof

    The Journal of Cell Biology
    |August 1, 1983
    PubMed
    Summary

    Human polymorphonuclear leukocytes (PMN) without nuclei, called cytoplasts, retain key functions. These enucleated cells can phagocytose and generate bactericidal compounds, demonstrating the plasma membrane and cytosol are crucial for these immune responses.

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    Area of Science:

    • Immunology
    • Cell Biology

    Background:

    • Polymorphonuclear leukocytes (PMN) are critical immune cells.
    • Understanding the specific cellular components responsible for PMN functions is essential for immunology research.

    Purpose of the Study:

    • To investigate the functional capacity of enucleated human PMN (cytoplasts).
    • To determine if the plasma membrane and cytosol alone are sufficient for key PMN functions like phagocytosis and oxidative burst.

    Main Methods:

    • Isolation of intact human PMN.
    • Preparation of enucleated PMN cytoplasts using Ficoll gradient and cytochalasin B.
    • Incubation of cytoplasts with opsonized zymosan particles, phorbol-myristate acetate, and Staphylococcus aureus.
    • Assessment of respiratory burst, phagocytosis, bacterial killing, and chemotactic activity.

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    Main Results:

    • PMN cytoplasts, lacking nuclei and granules, retained significant plasma membrane and cytoplasmic components.
    • Cytoplasts exhibited a comparable respiratory burst response to intact PMN when stimulated.
    • Phagocytosis of Staphylococcus aureus was efficient at low bacteria/cell ratios, and bacterial killing was observed, albeit slower than in intact PMN.

    Conclusions:

    • The plasma membrane and cytosol of PMN contain the necessary machinery for phagocytosis, generation of bactericidal oxygen compounds, and bacterial killing.
    • These findings highlight the importance of the plasma membrane and cytosol in PMN effector functions and immune response activation.