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Active rosette-forming T cells in the elderly.

B A Neilan, L Taddeini

    Journal of the American Geriatrics Society
    |April 1, 1979
    PubMed
    Summary
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    Healthy aging does not decrease T lymphocytes. This study found no significant differences in total or active rosette-forming T cells between younger and older adults, indicating robust T cell function in healthy aging.

    Area of Science:

    • Immunology
    • Gerontology
    • Cellular Biology

    Background:

    • T lymphocytes play a crucial role in immune function.
    • Aging can affect immune system parameters, but T cell function in healthy older adults requires further elucidation.

    Purpose of the Study:

    • To investigate the impact of aging on T lymphocytes by comparing T cell counts in young and elderly healthy individuals.
    • To assess whether total and active rosette-forming T cell numbers differ between age groups.

    Main Methods:

    • Recruited 21 healthy young adults (20-40 years) and 25 healthy elderly adults (60-85 years).
    • Measured total and active rosette-forming T cells (RFC) counts per cubic millimeter.
    • Analyzed percentages of total and active RFC, alongside total lymphocyte and B lymphocyte counts.

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    Main Results:

    • No significant difference was observed in the average number of total RFC between younger (1430 +/- 463/cu mm) and older adults (1443 +/- 398/cu mm).
    • Active RFC counts were also comparable: 526 +/- 185/cu mm in younger individuals versus 558 +/- 197/cu mm in older individuals.
    • Percentages of total RFC (78%) and active RFC (29-30%) showed no significant age-related variation. Total and B lymphocyte counts were also similar between groups.

    Conclusions:

    • T lymphocyte counts, assessed via rosette formation, remain stable in healthy individuals across different age groups.
    • Aging does not appear to diminish the number of T lymphocytes in healthy older persons.
    • These findings suggest preserved T cell numbers contribute to immune competence in healthy aging.