Altered Cortical and Hippocampal Excitability in TgF344-AD Rats Modeling Alzheimer's Disease Pathology.


Journal

Cerebral cortex (New York, N.Y. : 1991)
ISSN: 1460-2199
Titre abrégé: Cereb Cortex
Pays: United States
ID NLM: 9110718

Informations de publication

Date de publication:
01 06 2019
Historique:
received: 12 02 2018
revised: 20 04 2018
pubmed: 20 6 2018
medline: 23 9 2020
entrez: 20 6 2018
Statut: ppublish

Résumé

Current findings suggest that accumulation of amyloid-β (Aβ) and hyperphosphorylated tau in the brain disrupt synaptic function in hippocampal-cortical neuronal networks leading to impairment in cognitive and affective functions in Alzheimer's disease (AD). Development of new disease-modifying AD drugs are challenging due to the lack of predictive animal models and efficacy assays. In the present study we recorded neural activity in TgF344-AD rats, a transgenic model with a full array of AD pathological features, including age-dependent Aβ accumulation, tauopathy, neuronal loss, and cognitive impairments. Under urethane anesthesia, TgF344-AD rats showed significant age-dependent decline in brainstem-elicited hippocampal theta oscillation and decreased theta-phase gamma-amplitude coupling comparing to their age-matched wild-type counterparts. In freely-behaving condition, the power of hippocampal theta oscillation and gamma power during sharp-wave ripples were significantly lower in TgF344-AD rats. Additionally, these rats showed impaired coherence in both intercortical and hippocampal-cortical network dynamics, and increased incidence of paroxysmal high-voltage spindles, which occur during awake, behaviorally quiescent state. TgF344-AD rats demonstrated impairments in sensory processing, having diminished auditory gating and 40-Hz auditory evoked steady-state response. The observed differences in neurophysiological activities in TgF344-AD rats, which mirror several abnormalities described in AD patients, may be used as promising markers to monitor disease-modifying therapies.

Identifiants

pubmed: 29920597
pii: 5039145
doi: 10.1093/cercor/bhy140
pmc: PMC7302691
doi:

Types de publication

Journal Article Research Support, N.I.H., Extramural Research Support, Non-U.S. Gov't

Langues

eng

Sous-ensembles de citation

IM

Pagination

2716-2727

Informations de copyright

© The Author(s) 2018. Published by Oxford University Press. All rights reserved. For Permissions, please e-mail: journals.permissions@oup.com.

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Auteurs

Milan Stoiljkovic (M)

Department of Comparative Medicine, Yale University School of Medicine, New Haven, CT, USA.

Craig Kelley (C)

Department of Comparative Medicine, Yale University School of Medicine, New Haven, CT, USA.

Bernardo Stutz (B)

Department of Comparative Medicine, Yale University School of Medicine, New Haven, CT, USA.

Tamas L Horvath (TL)

Department of Comparative Medicine, Yale University School of Medicine, New Haven, CT, USA.

Mihály Hajós (M)

Department of Comparative Medicine, Yale University School of Medicine, New Haven, CT, USA.

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Classifications MeSH