Cited by 75Alzheimer's disease research and treatmentsNeuroscience and Neuropharmacology ResearchNeuroinflammation and Neurodegeneration Mechanisms

Oligomers of Amyloid β Prevent Physiological Activation of the Cellular Prion Protein-Metabotropic Glutamate Receptor 5 Complex by Glutamate in Alzheimer Disease

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Haas, Laura T., Strittmatter, Stephen M.·2016·Journal of Biological Chemistry

Abstract

The dysfunction and loss of synapses in Alzheimer disease are central to dementia symptoms. We have recently demonstrated that pathological Amyloid β oligomer (Aβo) regulates the association between intracellular protein mediators and the synaptic receptor complex composed of cellular prion protein (PrP(C)) and metabotropic glutamate receptor 5 (mGluR5). Here we sought to determine whether Aβo alters the physiological signaling of the PrP(C)-mGluR5 complex upon glutamate activation. We provide evidence that acute exposure to Aβo as well as chronic expression of familial Alzheimer disease mutant transgenes in model mice prevents protein-protein interaction changes of the complex induced by the glutamate analog 3,5-dihydroxyphenylglycine. We further show that 3,5-dihydroxyphenylglycine triggers the phosphorylation and activation of protein-tyrosine kinase 2-β (PTK2B, also referred to as Pyk2) and of calcium/calmodulin-dependent protein kinase II in wild-type brain slices but not in Alzheimer disease transgenic brain slices or wild-type slices incubated with Aβo. This study further distinguishes two separate Aβo-dependent signaling cascades, one dependent on extracellular Ca(2+) and Fyn kinase activation and the other dependent on the release of Ca(2+) from intracellular stores. Thus, Aβo triggers multiple distinct PrP(C)-mGluR5-dependent events implicated in neurodegeneration and dementia. We propose that targeting the PrP(C)-mGluR5 complex will reverse aberrant Aβo-triggered states of the complex to allow physiological fluctuations of glutamate signaling.

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Authors
Haas, L. T., & Strittmatter, S. M.
Affiliations
Yale University (US)
Corresponding author
Strittmatter, Stephen M.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2016-08
Volume
291
Issue
33
Pages
17112-17121
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2470709430
Cited by
75
References
8
Citations by year
2026: 6 · 2025: 1 · 2024: 6 · 2023: 4 · 2022: 9 · 2021: 11 · 2020: 5 · 2019: 10 · 2018: 12 · 2017: 8 · 2016: 3
FWCI
7.53
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Institutes of Health (R01AG034924, P50AG047270)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
amyloid-beta oligomers, Alzheimer's disease, cellular prion protein, metabotropic glutamate receptor 5, glutamate signaling, Pyk2, calcium/calmodulin-dependent protein kinase II, Fyn, calcium store release, synaptic dysfunction, neurodegeneration
MeSH terms
Alzheimer Disease, Animals, Disease Models, Animal, Female, Male, Mice, Transgenic, Peptide Fragments, Amyloid beta-Peptides, PrPC Proteins, Glutamic Acid, Mice, Receptor, Metabotropic Glutamate 5, Protein Aggregation, Pathological

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