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Mechanism of Cellular Formation and In Vivo Seeding Effects of Hexameric β-Amyloid Assemblies
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...
Autores principales: | , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Springer US
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8639606/ https://www.ncbi.nlm.nih.gov/pubmed/34608607 http://dx.doi.org/10.1007/s12035-021-02567-8 |
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author | Vrancx, Céline Vadukul, Devkee M. Suelves, Nuria Contino, Sabrina D’Auria, Ludovic Perrin, Florian van Pesch, Vincent Hanseeuw, Bernard Quinton, Loïc Kienlen-Campard, Pascal |
author_facet | Vrancx, Céline Vadukul, Devkee M. Suelves, Nuria Contino, Sabrina D’Auria, Ludovic Perrin, Florian van Pesch, Vincent Hanseeuw, Bernard Quinton, Loïc Kienlen-Campard, Pascal |
author_sort | Vrancx, Céline |
collection | PubMed |
description | 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. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s12035-021-02567-8. |
format | Online Article Text |
id | pubmed-8639606 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | Springer US |
record_format | MEDLINE/PubMed |
spelling | pubmed-86396062021-12-03 Mechanism of Cellular Formation and In Vivo Seeding Effects of Hexameric β-Amyloid Assemblies Vrancx, Céline Vadukul, Devkee M. Suelves, Nuria Contino, Sabrina D’Auria, Ludovic Perrin, Florian van Pesch, Vincent Hanseeuw, Bernard Quinton, Loïc Kienlen-Campard, Pascal Mol Neurobiol Article 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. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s12035-021-02567-8. Springer US 2021-10-04 2021 /pmc/articles/PMC8639606/ /pubmed/34608607 http://dx.doi.org/10.1007/s12035-021-02567-8 Text en © The Author(s) 2021 https://creativecommons.org/licenses/by/4.0/Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
spellingShingle | Article Vrancx, Céline Vadukul, Devkee M. Suelves, Nuria Contino, Sabrina D’Auria, Ludovic Perrin, Florian van Pesch, Vincent Hanseeuw, Bernard Quinton, Loïc Kienlen-Campard, Pascal Mechanism of Cellular Formation and In Vivo Seeding Effects of Hexameric β-Amyloid Assemblies |
title | Mechanism of Cellular Formation and In Vivo Seeding Effects of Hexameric β-Amyloid Assemblies |
title_full | Mechanism of Cellular Formation and In Vivo Seeding Effects of Hexameric β-Amyloid Assemblies |
title_fullStr | Mechanism of Cellular Formation and In Vivo Seeding Effects of Hexameric β-Amyloid Assemblies |
title_full_unstemmed | Mechanism of Cellular Formation and In Vivo Seeding Effects of Hexameric β-Amyloid Assemblies |
title_short | Mechanism of Cellular Formation and In Vivo Seeding Effects of Hexameric β-Amyloid Assemblies |
title_sort | mechanism of cellular formation and in vivo seeding effects of hexameric β-amyloid assemblies |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8639606/ https://www.ncbi.nlm.nih.gov/pubmed/34608607 http://dx.doi.org/10.1007/s12035-021-02567-8 |
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