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Amyloid beta induces Fmr1‐dependent translational suppression and hyposynchrony of neural activity via phosphorylation of eIF2α and eEF2

Alzheimer's disease (AD) is the most common cause of dementia, with the accumulation of amyloid beta peptide (Aβ) being one of the main causes of the disease. Fragile X mental retardation protein (FMRP), encoded by fragile X mental retardation 1 (Fmr1), is an RNA‐binding protein that represses...

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Autores principales: Lizarazo, Simon, Yook, Yeeun, Tsai, Nien‐Pei
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9283232/
https://www.ncbi.nlm.nih.gov/pubmed/35434801
http://dx.doi.org/10.1002/jcp.30754
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author Lizarazo, Simon
Yook, Yeeun
Tsai, Nien‐Pei
author_facet Lizarazo, Simon
Yook, Yeeun
Tsai, Nien‐Pei
author_sort Lizarazo, Simon
collection PubMed
description Alzheimer's disease (AD) is the most common cause of dementia, with the accumulation of amyloid beta peptide (Aβ) being one of the main causes of the disease. Fragile X mental retardation protein (FMRP), encoded by fragile X mental retardation 1 (Fmr1), is an RNA‐binding protein that represses translation of its bound mRNAs or exerts other indirect mechanisms that result in translational suppression. Because the accumulation of Aβ has been shown to cause translational suppression resulting from the elevated cellular stress response, in this study we asked whether and how Fmr1 is involved in Aβ‐induced translational regulation. Our data first showed that the application of synthetic Aβ peptide induces the expression of Fmr1 in cultured primary neurons. We followed by showing that Fmr1 is required for Aβ‐induced translational suppression, hyposynchrony of neuronal firing activity, and loss of excitatory synapses. Mechanistically, we revealed that Fmr1 functions to repress the expression of phosphatases including protein phosphatase 2A (PP2A) and protein phosphatase 1 (PP1), leading to elevated phosphorylation of eukaryotic initiation factor 2‐α (eIF2α) and eukaryotic elongation factor 2 (eEF2), and subsequent translational suppression. Finally, our data suggest that such translational suppression is critical to Aβ‐induced hyposynchrony of firing activity, but not the loss of synapses. Altogether, our study uncovers a novel mechanism by which Aβ triggers translational suppression and we reveal the participation of Fmr1 in altered neural plasticity associated with Aβ pathology. Our study may also provide information for a better understanding of Aβ‐induced cellular stress responses in AD.
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spelling pubmed-92832322022-10-14 Amyloid beta induces Fmr1‐dependent translational suppression and hyposynchrony of neural activity via phosphorylation of eIF2α and eEF2 Lizarazo, Simon Yook, Yeeun Tsai, Nien‐Pei J Cell Physiol Research Articles Alzheimer's disease (AD) is the most common cause of dementia, with the accumulation of amyloid beta peptide (Aβ) being one of the main causes of the disease. Fragile X mental retardation protein (FMRP), encoded by fragile X mental retardation 1 (Fmr1), is an RNA‐binding protein that represses translation of its bound mRNAs or exerts other indirect mechanisms that result in translational suppression. Because the accumulation of Aβ has been shown to cause translational suppression resulting from the elevated cellular stress response, in this study we asked whether and how Fmr1 is involved in Aβ‐induced translational regulation. Our data first showed that the application of synthetic Aβ peptide induces the expression of Fmr1 in cultured primary neurons. We followed by showing that Fmr1 is required for Aβ‐induced translational suppression, hyposynchrony of neuronal firing activity, and loss of excitatory synapses. Mechanistically, we revealed that Fmr1 functions to repress the expression of phosphatases including protein phosphatase 2A (PP2A) and protein phosphatase 1 (PP1), leading to elevated phosphorylation of eukaryotic initiation factor 2‐α (eIF2α) and eukaryotic elongation factor 2 (eEF2), and subsequent translational suppression. Finally, our data suggest that such translational suppression is critical to Aβ‐induced hyposynchrony of firing activity, but not the loss of synapses. Altogether, our study uncovers a novel mechanism by which Aβ triggers translational suppression and we reveal the participation of Fmr1 in altered neural plasticity associated with Aβ pathology. Our study may also provide information for a better understanding of Aβ‐induced cellular stress responses in AD. John Wiley and Sons Inc. 2022-04-17 2022-07 /pmc/articles/PMC9283232/ /pubmed/35434801 http://dx.doi.org/10.1002/jcp.30754 Text en © 2022 The Authors. Journal of Cellular Physiology published by Wiley Periodicals LLC. https://creativecommons.org/licenses/by/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Articles
Lizarazo, Simon
Yook, Yeeun
Tsai, Nien‐Pei
Amyloid beta induces Fmr1‐dependent translational suppression and hyposynchrony of neural activity via phosphorylation of eIF2α and eEF2
title Amyloid beta induces Fmr1‐dependent translational suppression and hyposynchrony of neural activity via phosphorylation of eIF2α and eEF2
title_full Amyloid beta induces Fmr1‐dependent translational suppression and hyposynchrony of neural activity via phosphorylation of eIF2α and eEF2
title_fullStr Amyloid beta induces Fmr1‐dependent translational suppression and hyposynchrony of neural activity via phosphorylation of eIF2α and eEF2
title_full_unstemmed Amyloid beta induces Fmr1‐dependent translational suppression and hyposynchrony of neural activity via phosphorylation of eIF2α and eEF2
title_short Amyloid beta induces Fmr1‐dependent translational suppression and hyposynchrony of neural activity via phosphorylation of eIF2α and eEF2
title_sort amyloid beta induces fmr1‐dependent translational suppression and hyposynchrony of neural activity via phosphorylation of eif2α and eef2
topic Research Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9283232/
https://www.ncbi.nlm.nih.gov/pubmed/35434801
http://dx.doi.org/10.1002/jcp.30754
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