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Long-Term Blocking of Calcium Channels in mdx Mice Results in Differential Effects on Heart and Skeletal Muscle

The disease mechanisms underlying dystrophin-deficient muscular dystrophy are complex, involving not only muscle membrane fragility, but also dysregulated calcium homeostasis. Specifically, it has been proposed that calcium channels directly initiate a cascade of pathological events by allowing calc...

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Autores principales: Jørgensen, Louise H., Blain, Alison, Greally, Elizabeth, Laval, Steve H., Blamire, Andrew M., Davison, Benjamin J., Brinkmeier, Heinrich, MacGowan, Guy A., Schrøder, Henrik D., Bushby, Kate, Straub, Volker, Lochmüller, Hanns
Formato: Texto
Lenguaje:English
Publicado: American Society for Investigative Pathology 2011
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3016598/
https://www.ncbi.nlm.nih.gov/pubmed/21224064
http://dx.doi.org/10.1016/j.ajpath.2010.11.027
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author Jørgensen, Louise H.
Blain, Alison
Greally, Elizabeth
Laval, Steve H.
Blamire, Andrew M.
Davison, Benjamin J.
Brinkmeier, Heinrich
MacGowan, Guy A.
Schrøder, Henrik D.
Bushby, Kate
Straub, Volker
Lochmüller, Hanns
author_facet Jørgensen, Louise H.
Blain, Alison
Greally, Elizabeth
Laval, Steve H.
Blamire, Andrew M.
Davison, Benjamin J.
Brinkmeier, Heinrich
MacGowan, Guy A.
Schrøder, Henrik D.
Bushby, Kate
Straub, Volker
Lochmüller, Hanns
author_sort Jørgensen, Louise H.
collection PubMed
description The disease mechanisms underlying dystrophin-deficient muscular dystrophy are complex, involving not only muscle membrane fragility, but also dysregulated calcium homeostasis. Specifically, it has been proposed that calcium channels directly initiate a cascade of pathological events by allowing calcium ions to enter the cell. The objective of this study was to investigate the effect of chronically blocking calcium channels with the aminoglycoside antibiotic streptomycin from onset of disease in the mdx mouse model of Duchenne muscular dystrophy (DMD). Treatment in utero onwards delayed onset of dystrophic symptoms in the limb muscle of young mdx mice, but did not prevent degeneration and regeneration events occurring later in the disease course. Long-term treatment had a positive effect on limb muscle pathology, reduced fibrosis, increased sarcolemmal stability, and promoted muscle regeneration in older mice. However, streptomycin treatment did not show positive effects in diaphragm or heart muscle, and heart pathology was worsened. Thus, blocking calcium channels even before disease onset does not prevent dystrophy, making this an unlikely treatment for DMD. These findings highlight the importance of analyzing several time points throughout the life of the treated mice, as well as analyzing many tissues, to get a complete picture of treatment efficacy.
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spelling pubmed-30165982011-02-11 Long-Term Blocking of Calcium Channels in mdx Mice Results in Differential Effects on Heart and Skeletal Muscle Jørgensen, Louise H. Blain, Alison Greally, Elizabeth Laval, Steve H. Blamire, Andrew M. Davison, Benjamin J. Brinkmeier, Heinrich MacGowan, Guy A. Schrøder, Henrik D. Bushby, Kate Straub, Volker Lochmüller, Hanns Am J Pathol Regular Article The disease mechanisms underlying dystrophin-deficient muscular dystrophy are complex, involving not only muscle membrane fragility, but also dysregulated calcium homeostasis. Specifically, it has been proposed that calcium channels directly initiate a cascade of pathological events by allowing calcium ions to enter the cell. The objective of this study was to investigate the effect of chronically blocking calcium channels with the aminoglycoside antibiotic streptomycin from onset of disease in the mdx mouse model of Duchenne muscular dystrophy (DMD). Treatment in utero onwards delayed onset of dystrophic symptoms in the limb muscle of young mdx mice, but did not prevent degeneration and regeneration events occurring later in the disease course. Long-term treatment had a positive effect on limb muscle pathology, reduced fibrosis, increased sarcolemmal stability, and promoted muscle regeneration in older mice. However, streptomycin treatment did not show positive effects in diaphragm or heart muscle, and heart pathology was worsened. Thus, blocking calcium channels even before disease onset does not prevent dystrophy, making this an unlikely treatment for DMD. These findings highlight the importance of analyzing several time points throughout the life of the treated mice, as well as analyzing many tissues, to get a complete picture of treatment efficacy. American Society for Investigative Pathology 2011-01 /pmc/articles/PMC3016598/ /pubmed/21224064 http://dx.doi.org/10.1016/j.ajpath.2010.11.027 Text en © 2011 American Society for Investigative Pathology. Published by Elsevier Inc. All rights reserved. https://creativecommons.org/licenses/by-nc-nd/4.0/This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (https://creativecommons.org/licenses/by-nc-nd/4.0/) , which allows reusers to copy and distribute the material in any medium or format in unadapted form only, for noncommercial purposes only, and only so long as attribution is given to the creator.
spellingShingle Regular Article
Jørgensen, Louise H.
Blain, Alison
Greally, Elizabeth
Laval, Steve H.
Blamire, Andrew M.
Davison, Benjamin J.
Brinkmeier, Heinrich
MacGowan, Guy A.
Schrøder, Henrik D.
Bushby, Kate
Straub, Volker
Lochmüller, Hanns
Long-Term Blocking of Calcium Channels in mdx Mice Results in Differential Effects on Heart and Skeletal Muscle
title Long-Term Blocking of Calcium Channels in mdx Mice Results in Differential Effects on Heart and Skeletal Muscle
title_full Long-Term Blocking of Calcium Channels in mdx Mice Results in Differential Effects on Heart and Skeletal Muscle
title_fullStr Long-Term Blocking of Calcium Channels in mdx Mice Results in Differential Effects on Heart and Skeletal Muscle
title_full_unstemmed Long-Term Blocking of Calcium Channels in mdx Mice Results in Differential Effects on Heart and Skeletal Muscle
title_short Long-Term Blocking of Calcium Channels in mdx Mice Results in Differential Effects on Heart and Skeletal Muscle
title_sort long-term blocking of calcium channels in mdx mice results in differential effects on heart and skeletal muscle
topic Regular Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3016598/
https://www.ncbi.nlm.nih.gov/pubmed/21224064
http://dx.doi.org/10.1016/j.ajpath.2010.11.027
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