Cited by 148Alzheimer's disease research and treatmentsDementia and Cognitive Impairment ResearchNeuroinflammation and Neurodegeneration Mechanisms

Spreading of Tau Pathology in Sporadic Alzheimer’s Disease Along Cortico-cortical Top-Down Connections

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Braak, Heiko, Del Tredici, Kelly·2018·Cerebral Cortex

Abstract

By using AT8-immunocytochemistry that visualizes hyperphosphorylated tau protein, we examined neurofibrillary changes related to sporadic Alzheimer's disease (AD) in N = 40 individuals at neurofibrillary tangle (NFT) stages I-IV. We report the presence of abnormal tau changes within solitary pyramidal neurons in layers III and V of the neocortex. These pyramidal cells showed pathology in different cell compartments (dendritic, somatic, axonal) that appeared to occur sequentially: Tau pathology was seen in distal segments of the basal dendrites, then in proximal dendrites, the soma, and, finally, in the axon of affected neurons. These findings are remarkable in that they point to the existence of neurofibrillary changes in regions routinely associated with later NFT stages. In addition, they lend support to the idea that it may be the axons of cortico-cortical top-down neurons in neocortical fields involved in AD that carry and spread abnormal tau seeds in a focused manner (transsynaptically) into the distal dendritic segments of nerve cells following directly in the neuronal chain, thereby sustaining further tau-seeded templating.

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Crossref · 10.1093/cercor/bhy152

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  • Toxic species of aggregated tau affect pyramidal-cell dendritic complexity even before axonal aggregation.

    “Toxic species of aggregated tau affect pyramidal‐cell dendritic complexity 10 , 16 even before axonal aggregation. 10”

    From Alzheimer's disease and its progression reduce pyramidal cell gain and connectivity (2025) · cites this paper as [10]

    The Results (Group 1 and Fig. 2; page unavailable) describe bent, thickened pyramidal-cell dendrites containing abnormal tau. Figure 5 proposes that dendritic tau aggregates appear before axonal tau involvement. The paper does not establish that toxic tau species cause a change in dendritic complexity; it reports morphological observations and a proposed sequence. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • Pyramidal cells are directly affected by extracellular amyloid beta plaques and intraneuronal tau tangles.

    “Pyramidal cells are directly affected by the molecular hallmarks of AD: extracellular amyloid beta (Aβ) plaques 9 and intraneuronal tau tangles. 10”
  • Tau aggregates develop in pyramidal cells and can spread between pyramidal cells.

    “Tau aggregates develop in pyramidal cells and can spread between pyramidal cells. 10”
  • The lack of significant effect on primary auditory cortices is in accord with the classical progression of pathology over Braak stages with very late involvement of primary sensory cortices in disease staging.

    “in accord with the classical progression of pathology over Braak stages with very late involvement of primary sensory cortices in disease staging. 10”

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Authors
Braak, H., & Del Tredici, K.
Affiliations
  • Universität Ulm (DE)
  • Clinical Neuroanatomy Section/Department of Neurology, Center for Biomedical Research, University of Ulm, Helmholtzstrasse 8/1, Ulm, Germany
Corresponding author
Braak, Heiko
Venue
Cerebral Cortex
Published
2018-06-30
Volume
28
Issue
9
Pages
3372-3384
ISSN
  • 1047-3211 (ISSN-L)
  • 1460-2199
OpenAlex
W2810078757
Cited by
148
References
87
Citations by year
2026: 10 · 2025: 15 · 2024: 25 · 2023: 17 · 2022: 23 · 2021: 25 · 2020: 20 · 2019: 11 · 2018: 2
FWCI
9.97
Type
journal article
Language
en
Open access
Locations
  • Cerebral Cortex (publishedVersion, cc-by-nc)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by-nc)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
Funders
Hans and Ilse Breuer Foundation
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 › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
tau pathology, sporadic Alzheimer's disease, neurofibrillary tangles, hyperphosphorylated tau, pyramidal neurons, neocortex, tau seeding
MeSH terms
Adult, Aged, Aged, 80 and over, Alzheimer Disease, Female, Humans, Male, Middle Aged, Neurofibrillary Tangles, tau Proteins, Pyramidal Cells

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