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[Cognitive Function and Calcium. Molecular neuroimaging and calcium].

Makoto Higuchi1

  • 1Molecular Imaging Center, National Institute of Radiological Sciences, Japan.

Clinical Calcium
|January 31, 2015
PubMed
Summary

Alzheimer's disease involves protein aggregates that disrupt synaptic function by altering metabotropic glutamate receptor type 5 (mGluR5) and N-methyl-D-aspartate (NMDA) receptor interactions. Positron emission tomography (PET) imaging can visualize these changes, aiding personalized dementia treatment.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Pathology

Context:

  • Neurodegenerative dementias, such as Alzheimer's disease, are characterized by the accumulation of protein aggregates like amyloid-beta (Aβ) and tau.
  • These aggregates contribute to synaptic dysfunction by altering the interaction between metabotropic glutamate receptor type 5 (mGluR5) and N-methyl-D-aspartate (NMDA) receptors.

Purpose:

  • To explore the role of Aβ and tau in synaptic pathology in neurodegenerative dementias.
  • To investigate the potential of positron emission tomography (PET) imaging targeting mGluR5 as a biomarker for disrupted calcium homeostasis.
  • To assess the therapeutic potential of targeting mGluR5 and NMDA receptors for personalized dementia treatment.

Summary:

  • Amyloid-beta (Aβ) scaffolds metabotropic glutamate receptor type 5 (mGluR5) clustering, while tau may mediate N-methyl-D-aspartate (NMDA) receptor phosphorylation, enhancing their coupling and leading to calcium influx.
  • This synaptic alteration, characterized by mGluR5 clustering and altered receptor coupling, can be visualized in vivo using mGluR5-targeting PET radioligands.
  • This PET imaging approach may serve as a biomarker for impaired intraneuronal calcium homeostasis in dementias.

Impact:

  • Positron emission tomography (PET) imaging of mGluR5 offers a potential biomarker for synaptic dysfunction in neurodegenerative dementias.
  • Targeting mGluR5 and NMDA receptors presents a therapeutic avenue, with PET imaging guiding personalized treatment timing based on disease stage.