Cited by 271Alzheimer's disease research and treatmentsAutophagy in Disease and TherapyNeuroinflammation and Neurodegeneration Mechanisms

Autophagic and lysosomal defects in human tauopathies: analysis of post-mortem brain from patients with familial Alzheimer disease, corticobasal degeneration and progressive supranuclear palsy

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Piras, Antonio, Collin, Ludovic, Grüninger, Fiona, Graff, Caroline, Rönnbäck, Annica·2016·Acta Neuropathologica Communications

Abstract

INTRODUCTION: The accumulation of insoluble proteins within neurons and glia cells is a pathological hallmark of several neurodegenerative diseases. Abnormal aggregation of the microtubule-associated protein tau characterizes the neuropathology of tauopathies, such as Alzheimer disease (AD), corticobasal degeneration (CBD) and progressive supranuclear palsy (PSP). An impairment of the lysosomal degradation pathway called macroautophagy, hereafter referred to as autophagy, could contribute to the accumulation of aggregated proteins. The role of autophagy in neurodegeneration has been intensively studied in the context of AD but there are few studies in other tauopathies and it is not known if defects in autophagy is a general feature of tauopathies. In the present study, we analysed autophagic and lysosomal markers in human post-mortem brain samples from patients with early-onset familial AD (FAD) with the APP Swedish mutation (APPswe), CBD and PSP and control individuals. RESULTS: FAD, CBD and PSP patients displayed an increase in LC3-positive vesicles in frontal cortex, indicating an accumulation of autophagic vesicles. Moreover, using double-immunohistochemistry and in situ proximity ligation assay, we observed colocalization of hyperphosphorylated tau with the autophagy marker LC3 in FAD, CBD and PSP patients but not in control individuals. Increased levels of the lysosomal marker LAMP1 was detected in FAD and CBD, and in addition Cathepsin D was diffusely spread in the cytoplasm in all tauopathies suggesting an impaired lysosomal integrity. CONCLUSION: Taken together, our results indicate an accumulation of autophagic and lysosomal markers in human brain tissue from patients with primary tauopathies (CBD and PSP) as well as FAD, suggesting a defect of the autophagosome-lysosome pathway that may contribute to the development of tau pathology.

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  • Disruption of the autophagy-lysosomal pathway is a pathological hallmark in human tauopathy brain.

    “Disruption of the autophagy-lysosomal pathway (ALP) is another pathological hallmark in human tauopathy brain (Bain et al., 2019; Piras et al., 2016; Wang et al., 2009).”
  • Disruption of autophagic flux and failure of autophagosomes to fuse with lysosomes leads to a build-up of vesicles seen in dystrophic neurites and cell bodies in AD, CBD and PSP, as well as in tauopathy models.

    “Disruption of autophagic flux and a failure of autophagosomes to fuse with lysosomes leads to a build-up of vesicles, which can be seen in dystrophic neurites and cell bodies in AD, CBD and PSP, as well as in tauopathy models73–76.”

    From Tau-targeting therapies for Alzheimer disease (2018) · cites this paper as [76]

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Authors
Piras, A., Collin, L., Grüninger, F., Graff, C., & Rönnbäck, A.
Affiliations
  • Karolinska Institutet (SE)
  • F. Hoffmann-La Roche AG (CH)
  • Karolinska University Hospital (SE)
Corresponding author
Rönnbäck, Annica
Venue
Acta Neuropathologica Communications
Published
2016-03-02
Volume
4
Issue
1
Pages
22-22
ISSN
2051-5960 (ISSN-L)
OpenAlex
W2290722071
Cited by
271
References
78
Citations by year
2026: 27 · 2025: 39 · 2024: 34 · 2023: 29 · 2022: 24 · 2021: 36 · 2020: 31 · 2019: 15 · 2018: 21 · 2017: 10 · 2016: 5
FWCI
13.68
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Acta Neuropathologica Communications (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
F. Hoffman-La Roche
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
tauopathy, autophagy, lysosomal dysfunction, familial Alzheimer's disease, APP Swedish mutation, corticobasal degeneration, progressive supranuclear palsy, hyperphosphorylated tau, LC3, LAMP1, cathepsin D, protein aggregation, postmortem brain
MeSH terms
Sequestosome-1 Protein, Aged, Aged, 80 and over, Alzheimer Disease, Autophagy, Brain, Female, Humans, Lysosomes, Male, Microtubule-Associated Proteins, Middle Aged, Nerve Tissue Proteins, Postmortem Changes, Supranuclear Palsy, Progressive, tau Proteins, Neurodegenerative Diseases, Adaptor Proteins, Signal Transducing, Lysosomal-Associated Membrane Protein 1

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