Cited by 304Alzheimer's disease research and treatmentsPrion Diseases and Protein MisfoldingNeuroinflammation and Neurodegeneration Mechanisms

Mechanisms of secretion and spreading of pathological tau protein

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Brunello, Cecilia A., Merezhko, Maria, Uronen, Riikka-Liisa, Huttunen, Henri J.·2020·Cellular and Molecular Life Sciences

Abstract

Accumulation of misfolded and aggregated forms of tau protein in the brain is a neuropathological hallmark of tauopathies, such as Alzheimer’s disease and frontotemporal lobar degeneration. Tau aggregates have the ability to transfer from one cell to another and to induce templated misfolding and aggregation of healthy tau molecules in previously healthy cells, thereby propagating tau pathology across different brain areas in a prion-like manner. The molecular mechanisms involved in cell-to-cell transfer of tau aggregates are diverse, not mutually exclusive and only partially understood. Intracellular accumulation of misfolded tau induces several mechanisms that aim to reduce the cellular burden of aggregated proteins and also promote secretion of tau aggregates. However, tau may also be released from cells physiologically unrelated to protein aggregation. Tau secretion involves multiple vesicular and non-vesicle-mediated pathways, including secretion directly through the plasma membrane. Consequently, extracellular tau can be found in various forms, both as a free protein and in vesicles, such as exosomes and ectosomes. Once in the extracellular space, tau aggregates can be internalized by neighboring cells, both neurons and glial cells, via endocytic, pinocytic and phagocytic mechanisms. Importantly, accumulating evidence suggests that prion-like propagation of misfolding protein pathology could provide a general mechanism for disease progression in tauopathies and other related neurodegenerative diseases. Here, we review the recent literature on cellular mechanisms involved in cell-to-cell transfer of tau, with a particular focus in tau secretion.

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  • CSF p-tau biomarkers likely indicate an active process of tau secretion, and one that is correlated with cerebral Aβ deposition in early disease.

    “Thus, it is suggested that CSF p-tau biomarkers likely indicate an active process of tau secretion, and one that is correlated with cerebral Aβ deposition in early disease.20, 21, 22”

    From Cerebrospinal fluid p-tau231 as an early indicator of emerging pathology in Alzheimer's disease (2022) · cites this paper as [22]

    The Cell-to-cell transfer of tau section says CSF in AD contains elevated phosphorylated tau and that active cellular processes contribute to tau secretion. The paper also discusses amyloid pathology as a possible trigger for tau release, but it does not state that CSF p-tau biomarkers correlate with cerebral Aβ deposition in early disease. Page numbers are unavailable in our copy. (LLM, conf=0.86)

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Research works printed but not linked: 3

  1. [34]Liu F Gong CX Tau exon 10 alternative splicing and tauopathies Mol Neurodegener 2008 3 8 10.1186/1750-1326-3-8 18616804 PMC2483273 · DOI · Paper page
  2. [56]Grundke-Iqbal I Iqbal K Tung YC Quinlan M Wisniewski HM Binder LI Abnormal phosphorylation of the microtubule-associated protein tau (tau) in Alzheimer cytoskeletal pathology Proc Natl Acad Sci USA 1986 83 13 4913 4917 10.1073/pnas.83.13.4913 3088567 PMC323854 · DOI · Paper page
  3. [120]Yamada K Neuronal activity regulates extracellular tau in vivo J Exp Med 2014 211 3 387 393 10.1084/jem.20131685 24534188 PMC3949564 · DOI

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Authors
Brunello, C. A., Merezhko, M., Uronen, R.-L., & Huttunen, H. J.
Affiliations
University of Helsinki (FI)
Corresponding author
Huttunen, Henri J.
Venue
Cellular and Molecular Life Sciences
Published
2019-10-30
Volume
77
Issue
9
Pages
1721-1744
ISSN
  • 1420-682X (ISSN-L)
  • 1420-9071
OpenAlex
W2982627322
Cited by
304
References
267
Citations by year
2026: 36 · 2025: 45 · 2024: 56 · 2023: 38 · 2022: 46 · 2021: 57 · 2020: 25 · 2019: 1
FWCI
3.80
Type
journal article
Language
en
Open access
Locations
  • Cellular and Molecular Life Sciences (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Työväentutkimus Vuosikirja (submittedVersion, cc-by)
Funders
  • Academy of Finland (296409)
  • Alfred Kordelinin Säätiö
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Prion Diseases and Protein Misfolding
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
tau protein, tauopathy, tau secretion, cell-to-cell transmission, prion-like propagation, tau aggregation, exosomes, ectosome, vesicular secretion, extracellular tau, endocytosis, phagocytosis, pinocytosis, Alzheimer's disease, frontotemporal lobar degeneration, neurodegeneration
MeSH terms
Animals, Humans, tau Proteins, Disease Progression, Tauopathies, Protein Aggregation, Pathological

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