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Related Experiment Videos

Cell-mediated effector mechanisms in aging humans

N B Marcano, A Rivas, E F Figarella

    International Archives of Allergy and Applied Immunology
    |January 1, 1982
    PubMed
    Summary

    Immune function in aging humans shows a decline in T cell activity but preserved nonspecific cell-mediated immunity. This research highlights the resilience of certain immune responses in older adults, including those with advanced age.

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    Area of Science:

    • Immunology
    • Gerontology
    • Cellular Biology

    Background:

    • Aging is associated with a decline in immune function, particularly T cell-mediated responses.
    • Understanding the status of both specific and nonspecific immune mechanisms in the elderly is crucial for health and disease management.

    Purpose of the Study:

    • To simultaneously assay specific and nonspecific cell-mediated effector mechanisms in a cohort of aged humans.
    • To investigate the impact of aging on T cell function and natural cytotoxicity.

    Main Methods:

    • Assayed proliferative response to alloantigens and generation of T killer cells.
    • Measured cell-mediated lympholysis, natural cell-mediated cytotoxicity against K562 cells, and antibody-dependent cell-mediated cytotoxicity (ADCC).
    • Included 15 aged individuals (8 female, 7 male), with one participant aged 114 years.

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    Main Results:

    • A significant decline in T cell function was observed in aged humans.
    • Nonspecific cell-mediated effector mechanisms, including natural cytotoxicity and ADCC, remained operative.
    • Individual variability in immune response was noted, with one exceptionally healthy 114-year-old participant.

    Conclusions:

    • Aging leads to a significant decline in specific T cell-mediated immunity.
    • Nonspecific immune functions demonstrate resilience and remain functional in aged individuals.
    • Further research into maintaining or enhancing these specific immune functions in the elderly is warranted.