Cited by 117Alzheimer's disease research and treatmentsDementia and Cognitive Impairment ResearchNeuroscience and Neuropharmacology Research

Soluble pathological tau in the entorhinal cortex leads to presynaptic deficits in an early Alzheimer’s disease model

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Polydoro, Manuela, Dzhala, Volodymyr I., Pooler, Amy M., Nicholls, Samantha B., McKinney, A. Patrick, Sanchez, Laura, Pitstick, Rose, Carlson, George A. +3 more·2014·Acta Neuropathologica

Abstract

Neurofibrillary tangles (NFTs), a hallmark of Alzheimer's disease, are intracellular silver and thioflavin S-staining aggregates that emerge from earlier accumulation of phospho-tau in the soma. Whether soluble misfolded but nonfibrillar tau disrupts neuronal function is unclear. Here we investigate if soluble pathological tau, specifically directed to the entorhinal cortex (EC), can cause behavioral or synaptic deficits. We studied rTgTauEC transgenic mice, in which P301L mutant human tau overexpressed primarily in the EC leads to the development of tau pathology, but only rare NFT at 16 months of age. We show that the early tau lesions are associated with nearly normal performance in contextual fear conditioning, a hippocampal-related behavior task, but more robust changes in neuronal system activation as marked by Arc induction and clear electrophysiological defects in perforant pathway synaptic plasticity. Electrophysiological changes were likely due to a presynaptic deficit and changes in probability of neurotransmitter release. The data presented here support the hypothesis that misfolded and hyperphosphorylated tau can impair neuronal function within the entorhinal-hippocampal network, even prior to frank NFT formation and overt neurodegeneration.

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  • Soluble oligomeric tau may play a more essential role in neurodegeneration than insoluble fibrillar tau, including NFTs.

    “These findings indicate that soluble oligomeric tau may play a more essential role in neurodegeneration than insoluble fibrillar tau (including NFT), the “tau we can see”.”
  • Soluble tau, rather than fibrillar tau, impacts responsiveness of neurons to environmental stimuli in hippocampus after memory formation.

    “From assessments of immediate early gene expression in the hippocampus after memory formation, it again appears that soluble tau, rather than fibrillar tau, seems to impact the responsiveness of neurons to environmental stimuli.”

    From All the Tau We Cannot See (2023) · cites this paper as [20]

  • Mitochondrial abnormalities, synaptic loss and dysfunction, altered axonal transport, and activation of cell death pathways have been implicated as consequences of tau mislocalization or oligomerization.

    “Mitochondrial abnormalities, synaptic loss and dysfunction, altered axonal transport, and activation of cell death pathways (including caspase activation and inflammatory responses) have all been directly or indirectly implicated as consequences of tau mislocalization or oligomerization (20, 40, 43–52).”

    From All the Tau We Cannot See (2023) · cites this paper as [20]

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Authors
Polydoro, M., Dzhala, V. I., Pooler, A. M., Nicholls, S. B., McKinney, A. P., Sanchez, L., Pitstick, R., Carlson, G. A., Staley, K. J., Spires-Jones, T. L., & Hyman, B. T.
Affiliations
  • Harvard University (US)
  • McLaughlin Research Institute (US)
Corresponding author
Hyman, Bradley T.
Venue
Acta Neuropathologica
Published
2013-11-24
Volume
127
Issue
2
Pages
257-270
ISSN
  • 0001-6322 (ISSN-L)
  • 1432-0533
OpenAlex
W2059127030
Cited by
117
References
63
Citations by year
2026: 7 · 2025: 10 · 2024: 11 · 2023: 4 · 2022: 10 · 2021: 7 · 2020: 12 · 2019: 11 · 2018: 12 · 2017: 10 · 2016: 8 · 2015: 11 · 2014: 3 · 2013: 1
FWCI
5.32
Type
journal article
Language
en
Open access
Locations
  • Acta Neuropathologica (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • Research Portal (King's College London) (submittedVersion)
Funders
  • National Institutes of Health
  • National Institute on Aging (R01AG026249, 5T32AG00022222, R00AG033670, R21AG038835, P50AG005134, R21AG03885, T32AG000222, P30AG062421)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
entorhinal cortex, Alzheimer's disease, neurofibrillary tangles, hyperphosphorylated tau, contextual fear conditioning, neurotransmitter release probability
MeSH terms
Alzheimer Disease, Animals, Cytoskeletal Proteins, Disease Models, Animal, Hippocampus, Humans, Mice, Inbred C57BL, Mice, Transgenic, Nerve Tissue Proteins, Neuronal Plasticity, tau Proteins, Presynaptic Terminals, Entorhinal Cortex, Mice, Electrophysiological Phenomena

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