Cited by 1,328Alzheimer's disease research and treatmentsNeural dynamics and brain functionNeuroinflammation and Neurodegeneration Mechanisms

Gamma frequency entrainment attenuates amyloid load and modifies microglia

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Iaccarino, Hunter F., Singer, Annabelle C., Martorell, Anthony J., Rudenko, Andrii, Gao, Fan, Gillingham, Tyler Z., Mathys, Hansruedi, Seo, Jinsoo +8 more·2016·Nature

Abstract

Changes in gamma oscillations (20-50 Hz) have been observed in several neurological disorders. However, the relationship between gamma oscillations and cellular pathologies is unclear. Here we show reduced, behaviourally driven gamma oscillations before the onset of plaque formation or cognitive decline in a mouse model of Alzheimer's disease. Optogenetically driving fast-spiking parvalbumin-positive (FS-PV)-interneurons at gamma (40 Hz), but not other frequencies, reduces levels of amyloid-β (Aβ)1-40 and Aβ 1-42 isoforms. Gene expression profiling revealed induction of genes associated with morphological transformation of microglia, and histological analysis confirmed increased microglia co-localization with Aβ. Subsequently, we designed a non-invasive 40 Hz light-flickering regime that reduced Aβ 1-40 and Aβ 1-42 levels in the visual cortex of pre-depositing mice and mitigated plaque load in aged, depositing mice. Our findings uncover a previously unappreciated function of gamma rhythms in recruiting both neuronal and glial responses to attenuate Alzheimer's-disease-associated pathology.

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  • By genetically engineering opsins into target neurons and controlling light, these neurons can be activated or inhibited, which is important for sensory and motor recovery and rehabilitation.

    “By genetically engineering these proteins into target neurons and controlling the light around them, these neurons can be activated or inhibited, which is particularly important for sensory and motor recovery and rehabilitation.[555]”

    From Flexible Electronics and Devices as Human–Machine Interfaces for Medical Robotics (2022) · cites this paper as [555]

    The Methods (AAV vectors; Optogenetic stimulation protocol, page unavailable) describe expressing channelrhodopsin-2 in targeted mouse neurons and manipulating them with light. The paper supports light-driven activation, but does not establish light-driven inhibition or a role in sensory and motor recovery or rehabilitation; its Discussion instead concerns amyloid reduction in mouse models. (LLM, conf=0.87)

    Experimental — accuracy not yet measured
  • Optogenetic stimulation is based on opsins that are light-sensitive and expressed only in certain cell types.

    “Optogenetic stimulation is based on opsins that are sensitive to light signals and only expressed in certain types of cells.”
  • Gamma frequency modulation was beneficial in models with amyloid and/or tau pathology.

    “Indeed, gamma frequency modulation was beneficial in models with amyloid and/or tau pathology54.”
  • Gamma frequency modulation is beneficial in models with either amyloid and/or tau pathology.

    “Indeed, gamma frequency modulation was found to be beneficial in models with either amyloid and/or tau pathology52”
  • These amyloid reductions accompany morphological changes, including enlarged soma and shortened processes filled with Aβ.

    “Interestingly, entraining gamma oscillation at 40 Hz in 5xFAD mice induced amyloid reductions that were associated with an increase in microglial numbers and morphological changes such as soma enlargement and shortening of processes loaded with Aβ.”

    From Microglia in Alzheimer's disease (2017) · cites this paper as [158]

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Authors
Iaccarino, H. F., Singer, A. C., Martorell, A. J., Rudenko, A., Gao, F., Gillingham, T. Z., Mathys, H., Seo, J., Kritskiy, O., Abdurrob, F., Adaikkan, C., Canter, R. G., Rueda, R., Brown, E. N., Boyden, E. S., & Tsai, L.-H.
Affiliations
  • McGovern Institute for Brain Research (US)
  • Massachusetts Institute of Technology (US)
  • Massachusetts General Hospital (US)
  • Broad Institute (US)
Corresponding author
Tsai, Li-Huei
Venue
Nature
Published
2016-12-07
Volume
540
Issue
7632
Pages
230-235
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W2560234750
Cited by
1,328
References
41
Citations by year
2026: 169 · 2025: 191 · 2024: 172 · 2023: 160 · 2022: 147 · 2021: 150 · 2020: 131 · 2019: 85 · 2018: 76 · 2017: 42 · 2016: 2
FWCI
54.95
Type
journal article
Language
en
Open access
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
  • DSpace@MIT (Massachusetts Institute of Technology) (submittedVersion, cc-by-nc)
  • DSpace@MIT (Massachusetts Institute of Technology) (submittedVersion)
  • PMC
Funders
  • National Institute on Aging (RF1AG047661)
  • National Eye Institute (R01EY023173)
  • National Institute of General Medical Sciences (R01GM104948)
  • National Institute of Neurological Disorders and Stroke (DP1NS087724)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural dynamics and brain function
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
gamma oscillations, Alzheimer's disease, amyloid-beta, microglia, parvalbumin interneurons, optogenetics, amyloid plaques, 5xFAD mice, APP/PS1 mice, visual cortex, neurodegeneration
MeSH terms
Alzheimer Disease, Amyloid, Animals, Disease Models, Animal, Female, Interneurons, Light, Male, Parvalbumins, Peptide Fragments, Visual Cortex, Amyloid beta-Peptides, Microglia, Cell Shape, Mice, CA1 Region, Hippocampal, Plaque, Amyloid, Transcriptome, Optogenetics, Gamma Rhythm

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