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Related Experiment Videos

Reduced D-[3H]aspartate binding in Down's syndrome brains.

M D Simpson1, P Slater, A J Cross

  • 1Departments of Physiological Sciences, University of Manchester Medical School, U.K.

Brain Research
|April 10, 1989
PubMed
Summary

Down

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Area of Science:

  • Neuroscience
  • Neurodegenerative Diseases
  • Genetics

Background:

  • Down syndrome (DS) is a genetic disorder associated with intellectual disability.
  • Glutamate neurotransmission plays a critical role in brain function and is implicated in various neurological conditions.
  • Alterations in glutamate uptake sites have been observed in neurodegenerative diseases like Alzheimer's disease.

Purpose of the Study:

  • To investigate the status of glutamate uptake sites in the brains of individuals with Down syndrome.
  • To compare the changes in glutamate uptake sites in DS with those observed in Alzheimer's disease.

Main Methods:

  • Post-mortem brain tissue from individuals with Down syndrome and age-matched controls was used.
  • Radioligand binding assays were performed to measure D-[3H]aspartate binding to glutamate uptake sites.
  • Binding of [3H]N-(1-[2-thienyl]cyclohexyl)piperidine ([3H]TCP) to N-methyl-D-aspartate (NMDA) receptors was also assessed.

Main Results:

  • Down syndrome brains exhibited significantly reduced D-[3H]aspartate binding in multiple brain regions, including the frontal cortex, temporal cortex, hippocampus, and caudate nucleus.
  • No correlation was found between the density of Alzheimer-like neuropathological markers (plaques and tangles) or clinical dementia and the reduction in D-[3H]aspartate binding in DS brains.
  • Binding to postsynaptic NMDA sites, measured by [3H]TCP, was normal in DS brains.

Conclusions:

  • The study indicates a substantial and widespread reduction in glutamate uptake sites in Down syndrome brains.
  • These alterations in glutamate uptake are more pronounced in DS than in Alzheimer's disease.
  • The findings suggest a potential disruption in glutamate homeostasis contributing to the neurobiology of Down syndrome.

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