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Related Experiment Videos

Presynaptic and postsynaptic glutamatergic function in Alzheimer's disease.

R Cowburn1, J Hardy, P Roberts

  • 1Department of Biochemistry and Molecular Biology, St. Mary's Hospital Medical School, London, U.K.

Neuroscience Letters
|March 21, 1988
PubMed
Summary

Alzheimer's disease significantly reduces glutamate uptake sites in the brain, indicating presynaptic damage. However, postsynaptic NMDA receptors remain unaffected, suggesting preserved neuronal signaling pathways.

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Area of Science:

  • Neuroscience
  • Neurochemistry
  • Alzheimer's Disease Research

Background:

  • Alzheimer's disease (AD) is a neurodegenerative disorder characterized by progressive cognitive decline.
  • Glutamatergic neurotransmission plays a critical role in learning and memory, and its dysfunction is implicated in AD.
  • Understanding alterations in glutamate transporters and receptors is crucial for elucidating AD pathogenesis.

Purpose of the Study:

  • To investigate the status of glutamate uptake sites and N-methyl-D-aspartate (NMDA) receptors in the temporal cortex of Alzheimer's disease patients.
  • To differentiate between presynaptic and postsynaptic glutamatergic terminal integrity in AD.

Main Methods:

  • Utilized sodium-dependent D-aspartate binding assays to quantify glutamate uptake sites.

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  • Employed calcium/chloride-independent L-glutamate binding assays to measure postsynaptic NMDA receptor levels.
  • Analyzed tissue samples from the temporal cortex of control and Alzheimer's disease subjects.

    • Main Results:

    • A significant and substantial reduction in the number of glutamate uptake sites was observed in Alzheimer's disease patients compared to controls.
    • Levels of postsynaptic NMDA receptors remained unchanged between Alzheimer's disease and control groups.
    • These findings indicate a selective loss of presynaptic glutamatergic components.

    Conclusions:

    • Alzheimer's disease is associated with severe depletion of presynaptic glutamatergic elements, specifically glutamate uptake sites.
    • Postsynaptic NMDA receptors appear to be preserved in the temporal cortex during Alzheimer's disease.
    • This suggests that while presynaptic function is compromised, postsynaptic signaling mechanisms may remain intact in AD.