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Experimental histoplasmosis in the beige mouse.

M M Patiño, D Williams, J Ahrens

    Journal of Leukocyte Biology
    |March 1, 1987
    PubMed
    Summary

    Beige (bg/bg) mice exhibit increased mortality from Histoplasma capsulatum infection due to impaired macrophage function, not NK cell deficiency. This highlights the critical role of macrophages in host defense against fungal pathogens.

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    Area of Science:

    • Immunology
    • Microbiology
    • Genetics

    Background:

    • The beige (bg/bg) mouse model is used to study immune deficiencies.
    • Histoplasma capsulatum is a fungal pathogen causing significant human disease.

    Purpose of the Study:

    • To investigate the immunologic basis for increased susceptibility of beige (bg/bg) mice to Histoplasma capsulatum infection.
    • To determine the roles of Natural Killer (NK) cells and macrophages in the host defense against H. capsulatum.

    Main Methods:

    • Comparison of mortality and fungal burden in bg/bg, bg/+, and C57Bl/6 mice after H. capsulatum challenge.
    • Assessment of delayed-type hypersensitivity (DTH) reactions.
    • Evaluation of NK cell cytotoxic activity against YAC-1 target cells.
    • In vitro studies of macrophage-mediated killing of H. capsulatum, with and without T lymphocyte activation.

    Main Results:

    • Beige (bg/bg) mice showed significantly higher mortality and lung fungal burden compared to control groups.
    • bg/bg mice exhibited normal DTH responses but deficient NK cell activity.
    • T lymphocytes from both bg/+ and bg/bg mice could activate H. capsulatum killing by normal (bg/+) macrophages, but not by bg/bg macrophages.

    Conclusions:

    • Macrophage dysfunction is likely the critical factor underlying the increased susceptibility of bg/bg mice to H. capsulatum.
    • Macrophage function plays a crucial role in host defense against H. capsulatum infections.
    • While NK cell activity may contribute, impaired macrophage function appears more significant in this model.

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