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Articles, Neurobiology of Disease

Attenuation of β-Amyloid Deposition and Neurotoxicity by Chemogenetic Modulation of Neural Activity

Peng Yuan (袁鹏) and Jaime Grutzendler
Journal of Neuroscience 13 January 2016, 36 (2) 632-641; DOI: https://doi.org/10.1523/JNEUROSCI.2531-15.2016
Peng Yuan (袁鹏)
1Departments of Neurology and
2Neuroscience, Yale University, New Haven, Connecticut 06510
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  • ORCID record for Peng Yuan (袁鹏)
Jaime Grutzendler
1Departments of Neurology and
2Neuroscience, Yale University, New Haven, Connecticut 06510
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Abstract

Aberrant neural hyperactivity has been observed in early stages of Alzheimer's disease (AD) and may be a driving force in the progression of amyloid pathology. Evidence for this includes the findings that neural activity may modulate β-amyloid (Aβ) peptide secretion and experimental stimulation of neural activity can increase amyloid deposition. However, whether long-term attenuation of neural activity prevents the buildup of amyloid plaques and associated neural pathologies remains unknown. Using viral-mediated delivery of designer receptors exclusively activated by designer drugs (DREADDs), we show in two AD-like mouse models that chronic intermittent increases or reductions of activity have opposite effects on Aβ deposition. Neural activity reduction markedly decreases Aβ aggregation in regions containing axons or dendrites of DREADD-expressing neurons, suggesting the involvement of synaptic and nonsynaptic Aβ release mechanisms. Importantly, activity attenuation is associated with a reduction in axonal dystrophy and synaptic loss around amyloid plaques. Thus, modulation of neural activity could constitute a potential therapeutic strategy for ameliorating amyloid-induced pathology in AD.

SIGNIFICANCE STATEMENT A novel chemogenetic approach to upregulate and downregulate neuronal activity in Alzheimer's disease (AD) mice was implemented. This led to the first demonstration that chronic intermittent attenuation of neuronal activity in vivo significantly reduces amyloid deposition. The study also demonstrates that modulation of β-amyloid (Aβ) release can occur at both axonal and dendritic fields, suggesting the involvement of synaptic and nonsynaptic Aβ release mechanisms. Activity reductions also led to attenuation of the synaptic pathology associated with amyloid plaques. Therefore, chronic attenuation of neuronal activity could constitute a novel therapeutic approach for AD.

  • Alzheimer's disease
  • amyloid plaque
  • axonal dystrophy
  • DREADD
  • neural activity
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The Journal of Neuroscience: 36 (2)
Journal of Neuroscience
Vol. 36, Issue 2
13 Jan 2016
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Attenuation of β-Amyloid Deposition and Neurotoxicity by Chemogenetic Modulation of Neural Activity
Peng Yuan (袁鹏), Jaime Grutzendler
Journal of Neuroscience 13 January 2016, 36 (2) 632-641; DOI: 10.1523/JNEUROSCI.2531-15.2016

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Attenuation of β-Amyloid Deposition and Neurotoxicity by Chemogenetic Modulation of Neural Activity
Peng Yuan (袁鹏), Jaime Grutzendler
Journal of Neuroscience 13 January 2016, 36 (2) 632-641; DOI: 10.1523/JNEUROSCI.2531-15.2016
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Keywords

  • Alzheimer's disease
  • amyloid plaque
  • axonal dystrophy
  • DREADD
  • neural activity

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