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T-lymphocyte function in Alzheimer's disease.

R M Torack

    Neuroscience Letters
    |November 21, 1986
    PubMed
    Summary

    T-lymphocyte function is impaired in Alzheimer's disease (AD), with reduced delayed type hypersensitivity and concanavalin A (Con A) responses observed. Some patients showed normal Con A responses, potentially explaining previous research inconsistencies.

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    Area of Science:

    • Immunology
    • Neuroscience
    • Gerontology

    Background:

    • Alzheimer's disease (AD) is a neurodegenerative disorder with complex pathophysiology.
    • Immune system dysregulation, particularly T-lymphocyte function, is increasingly implicated in AD pathogenesis.
    • Previous studies on T-cell function in AD have yielded inconsistent results.

    Purpose of the Study:

    • To comprehensively evaluate T-lymphocyte function in Alzheimer's disease (AD).
    • To assess delayed type hypersensitivity (DTH) and mitogen responsiveness in AD patients compared to normal aging controls.
    • To investigate the reasons for variability in T-cell function findings in prior AD research.

    Main Methods:

    • Delayed type hypersensitivity (DTH) skin tests were performed.
    • Mitogen responsiveness was assessed using concanavalin A (Con A) and BCG vaccine as stimulators.
    • Thymidine uptake was measured to quantify lymphocyte proliferation.

    Main Results:

    • T-lymphocyte function, specifically DTH and Con A response, was significantly diminished in individuals with AD compared to healthy aging individuals.
    • The Con A response analysis revealed two distinct subgroups: one with significantly lower thymidine uptake than normal controls, and another within the normal range.
    • This heterogeneity in Con A responsiveness may explain discrepancies in previous reports on T-cell function in AD.

    Conclusions:

    • T-lymphocyte function is demonstrably impaired in Alzheimer's disease.
    • The observed variability in T-cell responses, particularly to Con A, highlights the complexity of immune involvement in AD.
    • Understanding these immune alterations may offer new therapeutic targets for Alzheimer's disease.

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