Cited by 99Alzheimer's disease research and treatmentsNeural dynamics and brain functionDementia and Cognitive Impairment Research

Emergence of early alterations in network oscillations and functional connectivity in a tau seeding mouse model of Alzheimer’s disease pathology

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Ahnaou, A., Moechars, D., Raeymaekers, L., Biermans, R., Manyakov, N. V., Bottelbergs, A., Wintmolders, C., Van Kolen, K. +3 more·2017·Scientific Reports

Abstract

Synaptic dysfunction and disconnectivity are core deficits in Alzheimer’s disease (AD), preceding clear changes in histopathology and cognitive functioning. Here, the early and late effects of tau pathology induction on functional network connectivity were investigated in P301L mice. Multichannel EEG oscillations were used to compute (1) coherent activity between the prefrontal cortex (PFC) and hippocampus (HPC) CA1-CA3 networks; (2) phase-amplitude cross frequency coupling (PAC) between theta and gamma oscillations, which is instrumental in adequate cognitive functioning; (3) information processing as assessed by auditory evoked potentials and oscillations in the passive oddball mismatch negativity-like (MMN) paradigm. At the end, the density of tau aggregation and GABA parvalbumin (PV+) interneurons were quantified by immunohistochemistry. Early weakening of EEG theta oscillations and coherent activity were revealed between the PFC and HPC CA1 and drastic impairments in theta–gamma oscillations PAC from week 2 onwards, while PV+ interneurons count was not altered. Moreover, the tau pathology disrupted the MMN complex amplitude and evoked gamma oscillations to standard and deviant stimuli suggesting altered memory formation and recall. The induction of intracellular tau aggregation by tau seed injection results in early altered connectivity and strong theta–gamma oscillations uncoupling, which may be exploited as an early electrophysiological signature of dysfunctional neuronal networks.

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  • This will reduce sensitivity to incoming connections, reducing effective connectivity.

    “This will reduce sensitivity to incoming connections, reducing effective connectivity. 51”

    From Alzheimer's disease and its progression reduce pyramidal cell gain and connectivity (2025) · cites this paper as [51]

    The Discussion (Coherence; page unavailable) reports decreased hippocampal–prefrontal coherence and hypothesizes reduced information transfer in tau-seeded mice. The Discussion (MMN; page unavailable) also reports reduced responses to auditory stimuli. Neither passage says that reduced sensitivity to incoming connections causes a reduction in effective connectivity; the paper assesses functional connectivity through coherence. (LLM, conf=0.82)

    Experimental — accuracy not yet measured
  • Evoked gamma oscillations to auditory stimuli are disrupted in the tau seeding AD-like model.

    “Evoked gamma oscillations to auditory stimuli were also disrupted in this model [23].”

    From Parvalbumin interneuron vulnerability and brain disorders (2021) · cites this paper as [23]

  • In a tau seeding model with AD-like pathology, theta-gamma phase-amplitude coupling is impaired before neuronal loss or maximum tau pathology.

    “Theta-gamma oscillation phaseamplitude cross-frequency coupling was impaired prior to neuronal loss or maximum tau pathology in a tau seeding model with AD-like pathology [23].”

    From Parvalbumin interneuron vulnerability and brain disorders (2021) · cites this paper as [23]

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Research works printed but not linked: 1

  1. [26]Bell K Albert M Brandt J Stern Y Incidence and predictors of seizures in patients with Alzheimer’s disease Epilepsia 2006 47 867 872 10.1111/j.1528-1167.2006.00554.x 16686651 · DOI

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Authors
Ahnaou, A., Moechars, D., Raeymaekers, L., Biermans, R., Manyakov, N. V., Bottelbergs, A., Wintmolders, C., Van Kolen, K., Van De Casteele, T., Kemp, J. A., & Drinkenburg, W. H.
Affiliations
Janssen (Belgium) (BE)
Corresponding author
Ahnaou, A.
Venue
Scientific Reports
Published
2017-10-27
Volume
7
Issue
1
Pages
14189-14189
ISSN
2045-2322 (ISSN-L)
OpenAlex
W2765707864
Cited by
98
References
88
Citations by year
2026: 5 · 2025: 13 · 2024: 14 · 2023: 16 · 2022: 14 · 2021: 18 · 2020: 11 · 2019: 3 · 2018: 3 · 2016: 1
FWCI
3.44
Type
journal article
Language
en
Open access
Locations
  • Scientific Reports (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural dynamics and brain function
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
Keywords
Alzheimer's disease, tau pathology, tau seeding, EEG oscillations, functional connectivity, prefrontal cortex, hippocampus, parvalbumin interneurons, mismatch negativity, auditory evoked potentials, synaptic dysfunction, memory impairment, network oscillations
MeSH terms
Alzheimer Disease, Animals, Cognition, Disease Models, Animal, Electroencephalography, gamma-Aminobutyric Acid, Hippocampus, Nerve Net, Neurons, tau Proteins, Prefrontal Cortex, Mice

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