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The nigrostriatal system and aging.

T H McNeill, L L Koek, J W Haycock

    Peptides
    |January 1, 1984
    PubMed
    Summary

    Aging causes changes in dopamine (DA) neurons in the basal ganglia, affecting motor function. Similar axonal swellings in aged mice and humans suggest a role for these DA system changes in age-related motor decline.

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    Area of Science:

    • Neuroscience
    • Aging Research
    • Neurobiology

    Background:

    • Age-related motor deficits are linked to changes in basal ganglia neurotransmitter systems.
    • Dopamine (DA) pathways, particularly the nigrostriatal system, are crucial for motor control.

    Purpose of the Study:

    • To compare age-correlated morphological changes in dopaminergic neurons and their pathways in mice and humans.
    • To investigate the potential role of these changes in age-related motor dysfunction and Senile Dementia of the Alzheimer's Type (SDAT).

    Main Methods:

    • Histofluorescence microscopy was used to examine the morphology of nigrostriatal dopamine (DA) neurons.
    • Comparative analysis was performed on C57B1/6N Nia mice (aged and young) and postmortem human brain tissue (aged and SDAT cases).

    Main Results:

    • Aged mice showed increased large axonal dilations in the nigrostriatal pathway, similar to aged human brains.
    • Aged mice exhibited lipofuscin accumulation and reduced DA content per neuron.
    • Human brains with SDAT displayed abnormal patches/tangles of DA-containing fibers.

    Conclusions:

    • Age-correlated morphological changes in the nigrostriatal system of mice resemble those in aged humans.
    • Alterations in dopaminergic neurons and fibers may contribute to age-associated motor function decline.
    • Dopaminergic systems appear affected in SDAT, suggesting a role in the disease's pathology.

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