Mechanism of Cellular Formation and In Vivo Seeding Effects of Hexameric β-Amyloid Assemblies.
Alzheimer’s disease
Aβ oligomers
FAD model
Hexameric Aβ
Presenilins
Seeding
Journal
Molecular neurobiology
ISSN: 1559-1182
Titre abrégé: Mol Neurobiol
Pays: United States
ID NLM: 8900963
Informations de publication
Date de publication:
Dec 2021
Dec 2021
Historique:
received:
27
05
2021
accepted:
14
09
2021
pubmed:
6
10
2021
medline:
18
3
2022
entrez:
5
10
2021
Statut:
ppublish
Résumé
The β-amyloid peptide (Aβ) is found as amyloid fibrils in senile plaques, a typical hallmark of Alzheimer's disease (AD). However, intermediate soluble oligomers of Aβ are now recognized as initiators of the pathogenic cascade leading to AD. Studies using recombinant Aβ have shown that hexameric Aβ in particular acts as a critical nucleus for Aβ self-assembly. We recently isolated hexameric Aβ assemblies from a cellular model, and demonstrated their ability to enhance Aβ aggregation in vitro. Here, we report the presence of similar hexameric-like Aβ assemblies across several cellular models, including neuronal-like cell lines. In order to better understand how they are produced in a cellular context, we investigated the role of presenilin-1 (PS1) and presenilin-2 (PS2) in their formation. PS1 and PS2 are the catalytic subunits of the γ-secretase complex that generates Aβ. Using CRISPR-Cas9 to knockdown each of the two presenilins in neuronal-like cell lines, we observed a direct link between the PS2-dependent processing pathway and the release of hexameric-like Aβ assemblies in extracellular vesicles. Further, we assessed the contribution of hexameric Aβ to the development of amyloid pathology. We report the early presence of hexameric-like Aβ assemblies in both transgenic mice brains exhibiting human Aβ pathology and in the cerebrospinal fluid of AD patients, suggesting hexameric Aβ as a potential early AD biomarker. Finally, cell-derived hexameric Aβ was found to seed other human Aβ forms, resulting in the aggravation of amyloid deposition in vivo and neuronal toxicity in vitro.
Identifiants
pubmed: 34608607
doi: 10.1007/s12035-021-02567-8
pii: 10.1007/s12035-021-02567-8
pmc: PMC8639606
doi:
Substances chimiques
Amyloid beta-Peptides
0
Presenilins
0
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
6647-6669Subventions
Organisme : Fonds De La Recherche Scientifique - FNRS
ID : PDRT.0177.18
Informations de copyright
© 2021. The Author(s).
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