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Harvesting Murine Alveolar Macrophages and Evaluating Cellular Activation Induced by Polyanhydride Nanoparticles
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Published on: June 8, 2012

Antigen-presenting function of alveolar macrophages: uptake and presentation of Listeria monocytogenes

D S Weinberg, E R Unanue

    Journal of Immunology (Baltimore, Md. : 1950)
    |February 1, 1981
    PubMed

    Insights

    Alveolar macrophages present antigens to T cells, but their effectiveness depends on bacterial uptake. Enhancing uptake improves antigen presentation by these immune cells.

    Area of Science:

    • Immunology
    • Cell Biology

    Background:

    • Macrophages are crucial immune cells involved in antigen presentation.
    • Alveolar macrophages reside in the lungs, while peritoneal macrophages are in the abdominal cavity.
    • Understanding macrophage function is key to developing immune therapies.

    Purpose of the Study:

    • To compare the antigen-presenting capabilities of mouse alveolar and peritoneal macrophages.
    • To investigate the role of bacterial uptake in macrophage antigen presentation.
    • To determine if alveolar macrophages possess I-region-dependent antigen-presenting function.

    Main Methods:

    • Characterization of mouse alveolar and peritoneal macrophages.
    • Assessment of Listeria monocytogenes uptake by macrophages.
    • Measurement of T cell proliferation in response to Listeria-pulsed macrophages.
    • Evaluation of Listeria presentation with and without opsonization.

    Main Results:

    • Alveolar macrophages showed reduced uptake of Listeria monocytogenes compared to peritoneal macrophages.
    • Alveolar macrophages presented Listeria antigens, but less effectively than peritoneal macrophages.
    • Enhanced Listeria uptake, through opsonization, significantly improved antigen presentation by alveolar macrophages.
    • Antigen presentation by alveolar macrophages was dose-dependent, antigen-specific, genetically restricted, and required Ia-positive cells.

    Conclusions:

    • Alveolar macrophages possess I-region-dependent antigen-presenting function.
    • Bacterial uptake is a critical factor influencing the antigen-presenting capacity of alveolar macrophages.
    • Improving bacterial binding can enhance immune stimulation by alveolar macrophages.

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