Cited by 128Alzheimer's disease research and treatmentsPrion Diseases and Protein MisfoldingDementia and Cognitive Impairment Research

Cofactors are essential constituents of stable and seeding-active tau fibrils

Open access
Fichou, Yann, Lin, Yanxian, Rauch, Jennifer N., Vigers, Michael, Zeng, Zhikai, Srivastava, Madhur, Keller, Timothy J., Freed, Jack H. +2 more·2018·Proceedings of the National Academy of Sciences

Abstract

Amyloid fibrils are cross-β-rich aggregates that are exceptionally stable forms of protein assembly. Accumulation of tau amyloid fibrils is involved in many neurodegenerative diseases, including Alzheimer's disease (AD). Heparin-induced aggregates have been widely used and assumed to be a good tau amyloid fibril model for most biophysical studies. Here we show that mature fibrils made of 4R tau variants, prepared with heparin or RNA, spontaneously depolymerize and release monomers when their cofactors are removed. We demonstrate that the cross-β-sheet assembly formed in vitro with polyanion addition is unstable at room temperature. We furthermore demonstrate high seeding capacity with transgenic AD mouse brain-extracted tau fibrils in vitro that, however, is exhausted after one generation, while supplementation with RNA cofactors resulted in sustained seeding over multiple generations. We suggest that tau fibrils formed in brains are supported by unknown cofactors and inhere higher-quality packing, as reflected in a more distinct conformational arrangement in the mouse fibril-seeded, compared with heparin-induced, tau fibrils. Our study suggests that the role of cofactors in tauopathies is a worthy focus of future studies, as they may be viable targets for diagnosis and therapeutics.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1073/pnas.1810058115

Cites

37 of 37 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • Anionic experimental cofactor models, including heparin and RNA or its associated granules, promote Tau aggregation.

    “anionic experimental cofactor models have been described to promote aggregation: heparin (Goedert et al., 1996; Fichou et al., 2018) and RNA or its associated granules (Kampers et al., 1996; Zhang et al., 2017; Dinkel et al., 2015).”

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Fichou, Y., Lin, Y., Rauch, J. N., Vigers, M., Zeng, Z., Srivastava, M., Keller, T. J., Freed, J. H., Kosik, K. S., & Han, S.
Affiliations
  • University of California, Santa Barbara (US)
  • Cornell University (US)
Corresponding author
Fichou, Yann
Venue
Proceedings of the National Academy of Sciences
Published
2018-12-11
Volume
115
Issue
52
Pages
13234-13239
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2905087948
Cited by
128
References
37
Citations by year
2026: 15 · 2025: 20 · 2024: 12 · 2023: 14 · 2022: 19 · 2021: 24 · 2020: 14 · 2019: 10
FWCI
8.23
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
Funders
  • HHS | National Institutes of Health (R01AG05605, P41GM103521)
  • Tau consortium
  • Rainwater foundation
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
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
Keywords
tau protein, amyloid fibrils, cofactors, fibril seeding, Alzheimer's disease, tauopathy, 4R tau, neurodegeneration
MeSH terms
Alzheimer Disease, Amyloid, Animals, Brain, Heparin, Mice, Transgenic, Protein Conformation, Recombinant Proteins, RNA, tau Proteins, Mice

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review