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Related Experiment Videos

Synaptic atrophy in the senescent hippocampus.

W Bondareff

    Mechanisms of Ageing and Development
    |January 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Aging causes synapse loss in the rat dentate gyrus, primarily due to presynaptic neuron issues rather than neuron death. This suggests impaired axonal transport affects synaptic integrity during senescence.

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    Area of Science:

    • Neuroscience
    • Aging Research
    • Cell Biology

    Background:

    • Synaptic integrity is crucial for cognitive function.
    • Age-related changes in the brain are complex and not fully understood.
    • The dentate gyrus is a key brain region affected by aging.

    Purpose of the Study:

    • To investigate the cellular mechanisms underlying age-related synapse loss in the dentate gyrus.
    • To determine whether presynaptic or postsynaptic elements are primarily affected in senescence.
    • To explore the potential role of axonal transport in synaptic maintenance.

    Main Methods:

    • Quantitative analysis of electron micrographs from Fischer-344 rat brains.
    • Examination of synapses, dendritic spines, dendritic shafts, and axon terminals.

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  • Assessment of neuronal and dendritic integrity.

    • Main Results:

    • A significant decrease in the number of synapses was observed in the senescent dentate gyrus.
    • Synapse loss involved both presynaptic and postsynaptic components.
    • The loss of synapses was not dependent on prior loss of postsynaptic neurons or dendrites.

    Conclusions:

    • Age-related synapse loss in the dentate gyrus is likely due to presynaptic element malfunction.
    • Deficiencies in axonal transport and changes in presynaptic membrane glycoproteins may underlie this malfunction.
    • This presynaptic issue leads to partial deafferentation and secondary dendritic atrophy.