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Rheumatoid factor in the elderly. New methodology

J F Quaranta, J P Cassuto, R Giacobi

    Pathologie-Biologie
    |December 1, 1980
    PubMed
    Summary
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    Auto-antibody levels, including Rheumatoid Factor (RF), are lower in healthy elderly individuals than previously reported. This suggests aging, not autoimmune disease, is the primary cause of these immune system changes.

    Area of Science:

    • Gerontology
    • Immunology
    • Clinical Chemistry

    Background:

    • Auto-antibody incidence, particularly Rheumatoid Factor (RF), increases with age.
    • Previous studies indicate a higher prevalence of auto-antibodies in the elderly population.

    Purpose of the Study:

    • To investigate the incidence and levels of auto-antibodies, specifically RF, in a cohort of healthy elderly individuals.
    • To determine if observed auto-antibodies indicate underlying autoimmune conditions or are a marker of aging.

    Main Methods:

    • Utilized an original enzyme-immunoassay for Rheumatoid Factor (RF-EIA).
    • Analyzed a sample of 100 healthy individuals aged 65 to 98 years.
    • Assessed the presence and levels of various auto-antibodies.

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    Main Results:

    • A low incidence of RF (8%) was observed in the healthy elderly cohort.
    • The frequency of other auto-antibodies was also lower than reported in other studies.
    • Detected auto-antibody levels were significantly below those typically found in autoimmune diseases.

    Conclusions:

    • The findings suggest that the immune system disturbance in the elderly is more of an "humoral stigma of aging" than a sign of a latent autoimmune disease.
    • Lower auto-antibody levels in healthy elderly individuals challenge previous assumptions about age-related autoimmunity.