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Related Experiment Videos

Murine cytomegalovirus-induced macrophage dysfunction.

E L Pesanti, J D Shanley

    Journal of Leukocyte Biology
    |August 1, 1984
    PubMed
    Summary

    Murine cytomegalovirus (MCMV) infection impairs macrophage phagocytosis by reducing uptake velocity, not binding affinity. This defect affects non-immune phagocytosis and can be overcome with antibody opsonization.

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    Area of Science:

    • Immunology
    • Virology
    • Cell Biology

    Background:

    • Macrophages are crucial immune cells involved in phagocytosis.
    • Murine cytomegalovirus (MCMV) is a common viral pathogen that infects macrophages.
    • Viral infections can alter macrophage function, impacting host defense.

    Purpose of the Study:

    • To investigate the effect of MCMV infection on macrophage phagocytic activity.
    • To elucidate the mechanism behind the observed depression in phagocytosis.
    • To determine if the defect in phagocytosis is surface-mediated.

    Main Methods:

    • In vitro infection of macrophages with MCMV.
    • Measurement of radiolabeled Staphylococcus aureus uptake kinetics.
    • Analysis of Vmax and KM values.
    • Light and scanning electron microscopy.
    • Coincubation experiments with opsonizing antibody.

    Main Results:

    • MCMV-infected macrophages showed significantly reduced phagocytic uptake of particles.
    • The diminished uptake was attributed to a decreased Vmax, while KM remained unchanged.
    • Surface localization of the defect was confirmed via microscopy.
    • Antibody opsonization normalized the phagocytic rates.

    Conclusions:

    • MCMV infection induces a defect in macrophage phagocytosis.
    • The defect primarily affects the maximum velocity of particle uptake, indicating an issue with internal processing rather than initial binding.
    • This impairment of non-immune phagocytosis is surface-related and can be modulated by immune factors like antibodies.

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