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AChR β-Subunit mRNAs Are Stabilized by HuR in a Mouse Model of Congenital Myasthenic Syndrome With Acetylcholinesterase Deficiency

Collagen Q (COLQ) is a specific collagen that anchors acetylcholinesterase (AChE) in the synaptic cleft of the neuromuscular junction. So far, no mutation has been identified in the ACHE human gene but over 50 different mutations in the COLQ gene are causative for a congenital myasthenic syndrome (C...

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Autores principales: Karmouch, Jennifer, Delers, Perrine, Semprez, Fannie, Soyed, Nouha, Areias, Julie, Bélanger, Guy, Ravel-Chapuis, Aymeric, Dobbertin, Alexandre, Jasmin, Bernard J., Legay, Claire
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7757417/
https://www.ncbi.nlm.nih.gov/pubmed/33362463
http://dx.doi.org/10.3389/fnmol.2020.568171
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author Karmouch, Jennifer
Delers, Perrine
Semprez, Fannie
Soyed, Nouha
Areias, Julie
Bélanger, Guy
Ravel-Chapuis, Aymeric
Dobbertin, Alexandre
Jasmin, Bernard J.
Legay, Claire
author_facet Karmouch, Jennifer
Delers, Perrine
Semprez, Fannie
Soyed, Nouha
Areias, Julie
Bélanger, Guy
Ravel-Chapuis, Aymeric
Dobbertin, Alexandre
Jasmin, Bernard J.
Legay, Claire
author_sort Karmouch, Jennifer
collection PubMed
description Collagen Q (COLQ) is a specific collagen that anchors acetylcholinesterase (AChE) in the synaptic cleft of the neuromuscular junction. So far, no mutation has been identified in the ACHE human gene but over 50 different mutations in the COLQ gene are causative for a congenital myasthenic syndrome (CMS) with AChE deficiency. Mice deficient for COLQ mimic most of the functional deficit observed in CMS patients. At the molecular level, a striking consequence of the absence of COLQ is an increase in the levels of acetylcholine receptor (AChR) mRNAs and proteins in vivo and in vitro in murine skeletal muscle cells. Here, we decipher the mechanisms that drive AChR mRNA upregulation in cultured muscle cells deficient for COLQ. We show that the levels of AChR β-subunit mRNAs are post-transcriptionally regulated by an increase in their stability. We demonstrate that this process results from an activation of p38 MAPK and the cytoplasmic translocation of the nuclear RNA-binding protein human antigen R (HuR) that interacts with the AU-rich element located within AChR β-subunit transcripts. This HuR/AChR transcript interaction induces AChR β-subunit mRNA stabilization and occurs at a specific stage of myogenic differentiation. In addition, pharmacological drugs that modulate p38 activity cause parallel modifications of HuR protein and AChR β-subunit levels. Thus, our study provides new insights into the signaling pathways that are regulated by ColQ-deficiency and highlights for the first time a role for HuR and p38 in mRNA stability in a model of congenital myasthenic syndrome.
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spelling pubmed-77574172020-12-24 AChR β-Subunit mRNAs Are Stabilized by HuR in a Mouse Model of Congenital Myasthenic Syndrome With Acetylcholinesterase Deficiency Karmouch, Jennifer Delers, Perrine Semprez, Fannie Soyed, Nouha Areias, Julie Bélanger, Guy Ravel-Chapuis, Aymeric Dobbertin, Alexandre Jasmin, Bernard J. Legay, Claire Front Mol Neurosci Neuroscience Collagen Q (COLQ) is a specific collagen that anchors acetylcholinesterase (AChE) in the synaptic cleft of the neuromuscular junction. So far, no mutation has been identified in the ACHE human gene but over 50 different mutations in the COLQ gene are causative for a congenital myasthenic syndrome (CMS) with AChE deficiency. Mice deficient for COLQ mimic most of the functional deficit observed in CMS patients. At the molecular level, a striking consequence of the absence of COLQ is an increase in the levels of acetylcholine receptor (AChR) mRNAs and proteins in vivo and in vitro in murine skeletal muscle cells. Here, we decipher the mechanisms that drive AChR mRNA upregulation in cultured muscle cells deficient for COLQ. We show that the levels of AChR β-subunit mRNAs are post-transcriptionally regulated by an increase in their stability. We demonstrate that this process results from an activation of p38 MAPK and the cytoplasmic translocation of the nuclear RNA-binding protein human antigen R (HuR) that interacts with the AU-rich element located within AChR β-subunit transcripts. This HuR/AChR transcript interaction induces AChR β-subunit mRNA stabilization and occurs at a specific stage of myogenic differentiation. In addition, pharmacological drugs that modulate p38 activity cause parallel modifications of HuR protein and AChR β-subunit levels. Thus, our study provides new insights into the signaling pathways that are regulated by ColQ-deficiency and highlights for the first time a role for HuR and p38 in mRNA stability in a model of congenital myasthenic syndrome. Frontiers Media S.A. 2020-12-09 /pmc/articles/PMC7757417/ /pubmed/33362463 http://dx.doi.org/10.3389/fnmol.2020.568171 Text en Copyright © 2020 Karmouch, Delers, Semprez, Soyed, Areias, Bélanger, Ravel-Chapuis, Dobbertin, Jasmin and Legay. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Neuroscience
Karmouch, Jennifer
Delers, Perrine
Semprez, Fannie
Soyed, Nouha
Areias, Julie
Bélanger, Guy
Ravel-Chapuis, Aymeric
Dobbertin, Alexandre
Jasmin, Bernard J.
Legay, Claire
AChR β-Subunit mRNAs Are Stabilized by HuR in a Mouse Model of Congenital Myasthenic Syndrome With Acetylcholinesterase Deficiency
title AChR β-Subunit mRNAs Are Stabilized by HuR in a Mouse Model of Congenital Myasthenic Syndrome With Acetylcholinesterase Deficiency
title_full AChR β-Subunit mRNAs Are Stabilized by HuR in a Mouse Model of Congenital Myasthenic Syndrome With Acetylcholinesterase Deficiency
title_fullStr AChR β-Subunit mRNAs Are Stabilized by HuR in a Mouse Model of Congenital Myasthenic Syndrome With Acetylcholinesterase Deficiency
title_full_unstemmed AChR β-Subunit mRNAs Are Stabilized by HuR in a Mouse Model of Congenital Myasthenic Syndrome With Acetylcholinesterase Deficiency
title_short AChR β-Subunit mRNAs Are Stabilized by HuR in a Mouse Model of Congenital Myasthenic Syndrome With Acetylcholinesterase Deficiency
title_sort achr β-subunit mrnas are stabilized by hur in a mouse model of congenital myasthenic syndrome with acetylcholinesterase deficiency
topic Neuroscience
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7757417/
https://www.ncbi.nlm.nih.gov/pubmed/33362463
http://dx.doi.org/10.3389/fnmol.2020.568171
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