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Impaired lymphocyte function in aged humans.

M E Weksler, T H Hütteroth

    The Journal of Clinical Investigation
    |January 1, 1974
    PubMed
    Summary
    This summary is machine-generated.

    Older adults show reduced lymphocyte response to immune stimulants compared to younger individuals. This age-related decline in immune cell reactivity may impact overall immunologic competence.

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    Area of Science:

    • Immunology
    • Gerontology
    • Cellular Biology

    Background:

    • Immunologic competence is known to decline with age.
    • Lymphocyte function is a key component of the adaptive immune system.
    • Understanding age-related changes in lymphocyte response is crucial for public health.

    Purpose of the Study:

    • To compare the in vitro response of lymphocytes from young and old individuals.
    • To investigate the impact of aging on lymphocyte proliferation stimulated by mitogens and allogeneic cells.

    Main Methods:

    • Lymphocytes from young and old donors were cultured with phytohemagglutinin (PHA), pokeweed mitogen (PWM), or allogeneic lymphocytes.
    • Tritiated thymidine incorporation was measured to quantify lymphocyte proliferation.
    • Culture conditions were optimized for maximal lymphocyte transformation in both age groups.

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    Main Results:

    • Lymphocytes from older individuals exhibited significantly lower tritiated thymidine incorporation compared to lymphocytes from younger individuals.
    • This reduced reactivity was observed in response to both plant mitogens (PHA, PWM) and allogeneic cells.
    • No significant differences in the percentage of thymus-derived (T-cells) and bone marrow-derived (B-cells) lymphocytes were found between age groups.

    Conclusions:

    • Aging is associated with a diminished proliferative capacity of lymphocytes.
    • The observed decrease in lymphocyte reactivity is a potential contributor to the decline in immunologic competence seen in older adults.
    • These findings highlight age-related alterations in cellular immune function.