title: Attenuation of β-Amyloid Deposition and Neurotoxicity by Chemogenetic Modulation of Neural Activity.
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.
  
  
  CONCLUSIONS
  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.
authors.affiliation: Departments of Neurology and Neuroscience, Yale University, New Haven, Connecticut 06510.
authors.forename: Peng
authors.identifier: http://orcid.org/0000-0003-4051-4447
authors.initials: P
authors.lastname: Yuan
authors.affiliation: Departments of Neurology and Neuroscience, Yale University, New Haven, Connecticut 06510 jaime.grutzendler@yale.edu.
authors.forename: Jaime
authors.initials: J
authors.lastname: Grutzendler
mesh_terms: D000544:Alzheimer Disease / Q000235:genetics; D016229:Amyloid beta-Peptides / Q000378:metabolism*; D016564:Amyloid beta-Protein Precursor / Q000235:genetics; D000818:Animals; D002135:Calcium-Binding Proteins / Q000378:metabolism; D003024:Clozapine / Q000031:analogs & derivatives* / Q000494:pharmacology; D015198:Designer Drugs / Q000627:therapeutic use*; D004195:Disease Models, Animal; D006801:Humans; D007339:Insulysin / Q000378:metabolism; D051907:Lysosomal Membrane Proteins / Q000378:metabolism; D008297:Male; D051379:Mice; D008822:Mice, Transgenic; D008840:Microfilament Proteins / Q000378:metabolism; D009419:Nerve Tissue Proteins / Q000378:metabolism; D020258:Neurotoxicity Syndromes / Q000188:drug therapy* / Q000378:metabolism*; D053764:Presenilin-1 / Q000235:genetics; D016760:Proto-Oncogene Proteins c-fos / Q000378:metabolism; D013343:Styrenes / Q000494:pharmacology; D014161:Transduction, Genetic; D052118:Lysosomal-Associated Membrane Protein 1
chemical_list: D016229:Amyloid beta-Peptides; D016564:Amyloid beta-Protein Precursor; D002135:Calcium-Binding Proteins; D003024:Clozapine; D015198:Designer Drugs; D007339:Insulysin; D051907:Lysosomal Membrane Proteins; D008840:Microfilament Proteins; D009419:Nerve Tissue Proteins; D053764:Presenilin-1; D016760:Proto-Oncogene Proteins c-fos; D013343:Styrenes; C496440:(E,E)-1-fluoro-2,5-bis-(3-hydroxycarbonyl-4-hydroxy)styrylbenzene; C491049:Aif1 protein, mouse; C052255:Lamp1 protein, mouse; D052118:Lysosomal-Associated Membrane Protein 1; C508853:PSEN1 protein, human; C079149:clozapine N-oxide
keywords: Alzheimer's disease; DREADD; amyloid plaque; axonal dystrophy; neural activity