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Related Experiment Videos

Autoimmunity and normal immune functions in aged humans.

G Bátory, E Szondy, A Falus

    Archives of Gerontology and Geriatrics
    |October 1, 1985
    PubMed
    Summary
    This summary is machine-generated.

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    Autoantibodies (AABs) like ANA, A-LDL, and RF are common in older adults. Immune complexes (CIC) are less frequent, but ANA positivity may link to reduced cellular responses and enhanced killer cell activity in aging.

    Area of Science:

    • Immunology
    • Gerontology
    • Autoimmunity

    Background:

    • Autoantibodies (AABs) such as antinuclear antibodies (ANA), anti-low-density lipoprotein (A-LDL), and rheumatoid factor (RF) are frequently observed in advanced age.
    • Immune complexes (CIC) are less common than AABs in the elderly, with only the C1q solubility test indicating a higher incidence in aged versus young subjects.
    • The simultaneous occurrence of multiple AAB specificities or CIC detected by various methods is rare, and overall levels of both AABs and CIC are typically low in the aged population.

    Purpose of the Study:

    • To investigate the prevalence and characteristics of autoantibodies (AABs) and circulating immune complexes (CIC) in aged individuals.
    • To explore the relationship between AABs, CIC, and immune cell activity (DNA synthesis, killer cell activity) in the elderly.
    • To assess the potential role of AABs and CIC as autoregulatory factors in the aging immune system.

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    Main Methods:

    • Detection and quantification of various autoantibodies (ANA, A-LDL, RF) in serum samples from aged and young subjects.
    • Assessment of circulating immune complexes (CIC) using three distinct methods, including C1q solubility testing.
    • Evaluation of DNA synthetic responses to phytohemagglutinin (PHA) and allogeneic cells, alongside killer cell activity measurements.

    Main Results:

    • A high frequency of ANA, A-LDL, and RF suggests widespread AAB presence in aged individuals.
    • CIC incidence is considerably lower than AAB incidence; only C1q solubility indicated increased CIC in aged subjects compared to young.
    • ANA positivity correlated with reduced responses to allogeneic cells and enhanced killer cell activity, while CIC positivity was linked to lower C1q concentrations but generally within the normal range.

    Conclusions:

    • Autoantibodies are highly prevalent in the elderly, potentially reflecting compensatory mechanisms for age-related immune system changes.
    • Circulating immune complexes are less common and usually present at low levels, with their association with AABs depending on AAB specificity.
    • ANA and, to a lesser extent, CIC positivity may be linked to altered immune cell functions, including enhanced killer cell activity, suggesting a role in immune regulation during aging.