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The macrophage in cell biology of aging

L Lavie

    Archives of Gerontology and Geriatrics
    |January 1, 1994
    PubMed

    Insights

    Cellular aging in macrophages shows increased superoxide production and tissue transglutaminase activity in older mice. These aged macrophages exhibit altered responses to stimuli compared to younger ones.

    Area of Science:

    • Cell Biology
    • Immunology
    • Gerontology

    Background:

    • Peritoneal macrophages (PM) are valuable models for studying cellular aging, gene expression, and signal transduction.
    • Macrophages play a role in immunity and cellular responses, including respiratory burst activation.

    Purpose of the Study:

    • To investigate cellular aging in peritoneal macrophages from senescent mice.
    • To compare the biochemical and physiological characteristics of aged versus young macrophages.

    Main Methods:

    • Harvesting and culturing peritoneal macrophages from mice of defined ages.
    • Assessing superoxide anion production via NADPH oxidase activity in response to zymosan.
    • Measuring tissue transglutaminase (TGase) activity.
    • Evaluating responses to retinoid treatment.

    Main Results:

    • Senescent mouse PM exhibited increased superoxide production and TGase activity compared to young PM.
    • Aged PM showed non-specific activation and increased cell yield.
    • PM from senescent mice were unresponsive to retinoid-induced changes in TGase activity and superoxide release, unlike PM from young mice.
    • Altered receptor function and enzymic activities were observed in aged PM.

    Conclusions:

    • Peritoneal macrophages from senescent mice display distinct aging characteristics, including heightened superoxide production and altered responsiveness.
    • Macrophages serve as a viable model for exploring the cell biology of aging beyond their immunological functions.

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