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Related Experiment Videos

Senile dementia

R D Terry

    Federation Proceedings
    |December 1, 1978
    PubMed
    Summary

    Alzheimer's disease, a common cause of dementia, involves brain changes like neurofibrillary tangles and neuritic plaques. These changes correlate with dementia presence, though brain atrophy may not be more severe than in normal aging.

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    Area of Science:

    • Neurology
    • Pathology
    • Gerontology

    Background:

    • Senile dementia of the Alzheimer type (SDAT) is a prevalent and costly disorder with reduced life expectancy.
    • Normal aging involves gray-to-white-matter ratio changes and slight brain shrinkage.
    • Cortical neuron loss and dendritic changes occur in both normal aging and SDAT.

    Purpose of the Study:

    • To investigate the neuropathological hallmarks of Alzheimer's disease.
    • To compare brain atrophy and neuronal counts in SDAT patients versus age-matched controls.
    • To explore potential etiologies and neurochemical changes in SDAT.

    Main Methods:

    • Histopathological examination of brain specimens to identify neurofibrillary tangles and neuritic plaques.
    • Quantitative analysis of gray-to-white-matter ratios and neuronal counts in specific brain regions.
    • Assessment of choline acetyltransferase levels and muscarinic acetylcholine receptors.

    Main Results:

    • Neurofibrillary tangles (paired helical filaments) and neuritic plaques (amyloid core with abnormal axonal endings) are key pathological findings in SDAT.
    • SDAT brains may not exhibit significantly greater atrophy or neuronal loss in certain regions compared to normal aging controls.
    • A marked reduction in choline acetyltransferase was observed, while muscarinic acetylcholine receptors remained normal.

    Conclusions:

    • Neurofibrillary tangles and neuritic plaques are correlated with the presence of senile dementia.
    • Brain atrophy and neuronal counts in SDAT might not differ substantially from normal aging in all examined regions.
    • Evidence suggests a possible infectious etiology for SDAT, alongside observed neurochemical alterations.

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