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Related Experiment Videos

Immunological studies on Histoplasma capsulatum

S B De Sanchez, L M Carbonell

    Infection and Immunity
    |February 1, 1975
    PubMed
    Summary

    Alveolar macrophages phagocytize Histoplasma capsulatum yeast cells but not protoplasts. Immune sera, particularly against cell walls, enhance this phagocytosis, indicating a potential therapeutic target.

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    Mycologia·1972

    Area of Science:

    • Mycology
    • Immunology
    • Cell Biology

    Background:

    • Histoplasma capsulatum is a fungus causing infections.
    • Alveolar macrophages are key immune cells in the lungs.
    • Understanding fungal-macrophage interactions is crucial for treating infections.

    Purpose of the Study:

    • To investigate the phagocytosis of Histoplasma capsulatum yeast cells and protoplasts by rabbit alveolar macrophages.
    • To determine the role of immune sera in enhancing macrophage phagocytosis of H. capsulatum.

    Main Methods:

    • Harvesting alveolar macrophages from normal and immunized rabbits.
    • Parasitizing macrophages with H. capsulatum yeast cells and protoplasts.
    • Utilizing serological tests like precipitin and immunodiffusion assays.
    • Assessing the effect of immune sera on phagocytosis.

    Main Results:

    • Macrophages readily ingested yeast cells but failed to phagocytize protoplasts.
    • No significant intracellular killing of H. capsulatum was observed.
    • Serological tests revealed similarities between yeast cells, cell walls, and protoplasts.
    • Immune sera, especially anti-cell wall sera, significantly enhanced yeast cell phagocytosis.

    Conclusions:

    • Rabbit alveolar macrophages exhibit differential phagocytosis of H. capsulatum forms.
    • Immune sera, particularly those targeting cell walls, can overcome phagocytic resistance.
    • This suggests cell wall components are critical targets for immune-mediated clearance of H. capsulatum.

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