Astrocytic accumulation of tau fibrils isolated from Alzheimer's disease brains induces inflammation, cell-to-cell propagation and neuronal impairment.

Alzheimer’s disease Astrocytes Brain-derived fibrils Inflammation Neurons Tau

Journal

Acta neuropathologica communications
ISSN: 2051-5960
Titre abrégé: Acta Neuropathol Commun
Pays: England
ID NLM: 101610673

Informations de publication

Date de publication:
26 Feb 2024
Historique:
received: 21 12 2023
accepted: 17 02 2024
medline: 27 2 2024
pubmed: 27 2 2024
entrez: 26 2 2024
Statut: epublish

Résumé

Accumulating evidence highlights the involvement of astrocytes in Alzheimer's disease (AD) progression. We have previously demonstrated that human iPSC-derived astrocytes ingest and modify synthetic tau fibrils in a way that enhances their seeding efficiency. However, synthetic tau fibrils differ significantly from in vivo formed fibrils. To mimic the situation in the brain, we here analyzed astrocytes' processing of human brain-derived tau fibrils and its consequences for cellular physiology. Tau fibrils were extracted from both AD and control brains, aiming to examine any potential differences in astrocyte response depending on the origin of fibrils. Our results show that human astrocytes internalize, but fail to degrade, both AD and control tau fibrils. Instead, pathogenic, seeding capable tau proteoforms are spread to surrounding cells via tunneling nanotubes and exocytosis. Notably, accumulation of AD tau fibrils induces a stronger reactive state in astrocytes, compared to control fibrils, evident by the augmented expression of vimentin and GFAP, as well as by an increased secretion of the pro-inflammatory cytokines IL-8 and MCP-1. Moreover, conditioned media from astrocytes with AD tau fibril deposits induce synapse and metabolic impairment in human iPSC-derived neurons. Taken together, our data suggest that the accumulation of brain-derived AD tau fibrils induces a more robust inflammatory and neurotoxic phenotype in human astrocytes, accentuating the nature of tau fibrils as an important contributing factor to inflammation and neurodegeneration in AD.

Identifiants

pubmed: 38409026
doi: 10.1186/s40478-024-01745-8
pii: 10.1186/s40478-024-01745-8
doi:

Types de publication

Journal Article

Langues

eng

Sous-ensembles de citation

IM

Pagination

34

Informations de copyright

© 2024. The Author(s).

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Auteurs

Khalid Eltom (K)

Department of Public Health and Caring Sciences, Molecular Geriatrics, Rudbeck Laboratory, Uppsala University, Uppsala, 751 85, Sweden.

Tobias Mothes (T)

Department of Public Health and Caring Sciences, Molecular Geriatrics, Rudbeck Laboratory, Uppsala University, Uppsala, 751 85, Sweden.

Sylwia Libard (S)

Department of Immunology, Genetics and Pathology, Neuro-Oncology and Neurodegeneration, Uppsala University, Uppsala, Sweden.
Department of Pathology, Uppsala University Hospital, Uppsala, Sweden.

Martin Ingelsson (M)

Department of Public Health and Caring Sciences, Molecular Geriatrics, Rudbeck Laboratory, Uppsala University, Uppsala, 751 85, Sweden.
University Health Network, Krembil Brain Institute, Toronto, ON, Canada.
Tanz Centre for Research in Neurodegenerative Diseases, Departments of Medicine and Laboratory Medicine & Pathobiology, University of Toronto, Toronto, ON, Canada.

Anna Erlandsson (A)

Department of Public Health and Caring Sciences, Molecular Geriatrics, Rudbeck Laboratory, Uppsala University, Uppsala, 751 85, Sweden. anna.erlandsson@pubcare.uu.se.

Classifications MeSH