1
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Riddell DO, Hildyard JCW, Harron RCM, Taylor-Brown F, Kornegay JN, Wells DJ, Piercy RJ. Longitudinal assessment of skeletal muscle functional mechanics in the DE50-MD dog model of Duchenne muscular dystrophy. Dis Model Mech 2023; 16:dmm050395. [PMID: 38050706 PMCID: PMC10753191 DOI: 10.1242/dmm.050395] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Accepted: 11/29/2023] [Indexed: 12/06/2023] Open
Abstract
Duchenne muscular dystrophy (DMD), caused by mutations in the dystrophin (DMD) gene, is associated with fatal muscle degeneration and atrophy. Patients with DMD have progressive reductions in skeletal muscle strength and resistance to eccentric muscle stretch. Using the DE50-MD dog model of DMD, we assessed tibiotarsal joint (TTJ) flexor and extensor force dynamics, and the resistance of dystrophic muscle to eccentric stretch. Male DE50-MD and wild-type (WT) dogs were analysed every 3 months until 18 months of age. There was an age-associated decline in eccentric contraction resistance in DE50-MD TTJ flexors that discriminated, with high statistical power, WT from DE50-MD individuals. For isometric contraction, at the majority of timepoints, DE50-MD dogs had lower maximum absolute and relative TTJ flexor force, reduced TTJ muscle contraction times and prolonged relaxation compared to those in WT dogs. Cranial tibial muscles, the primary TTJ flexor, of 18-month-old DE50-MD dogs had significant numbers of regenerating fibres as expected, but also fewer type I fibres and more hybrid fibres than those in WT dogs. We conclude that these parameters, in particular, the eccentric contraction decrement, could be used as objective outcome measures for pre-clinical assessment in DE50-MD dogs.
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Affiliation(s)
- Dominique O. Riddell
- Comparative Neuromuscular Diseases Laboratory, Department of Clinical Science and Services, Royal Veterinary College, London NW10TU, UK
| | - John C. W. Hildyard
- Comparative Neuromuscular Diseases Laboratory, Department of Clinical Science and Services, Royal Veterinary College, London NW10TU, UK
| | - Rachel C. M. Harron
- Comparative Neuromuscular Diseases Laboratory, Department of Clinical Science and Services, Royal Veterinary College, London NW10TU, UK
| | - Frances Taylor-Brown
- Comparative Neuromuscular Diseases Laboratory, Department of Clinical Science and Services, Royal Veterinary College, London NW10TU, UK
| | - Joe N. Kornegay
- Texas A&M University, College of Veterinary Medicine and Biomedical Sciences, College Station, TX 77843, USA
| | - Dominic J. Wells
- Department of Comparative Biomedical Sciences, Royal Veterinary College, London NW10TU, UK
| | - Richard J. Piercy
- Comparative Neuromuscular Diseases Laboratory, Department of Clinical Science and Services, Royal Veterinary College, London NW10TU, UK
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2
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Acin‐Perez R, Benincá C, Fernandez del Rio L, Shu C, Baghdasarian S, Zanette V, Gerle C, Jiko C, Khairallah R, Khan S, Rincon Fernandez Pacheco D, Shabane B, Erion K, Masand R, Dugar S, Ghenoiu C, Schreiner G, Stiles L, Liesa M, Shirihai OS. Inhibition of ATP synthase reverse activity restores energy homeostasis in mitochondrial pathologies. EMBO J 2023; 42:e111699. [PMID: 36912136 PMCID: PMC10183817 DOI: 10.15252/embj.2022111699] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Revised: 01/24/2023] [Accepted: 01/25/2023] [Indexed: 03/14/2023] Open
Abstract
The maintenance of cellular function relies on the close regulation of adenosine triphosphate (ATP) synthesis and hydrolysis. ATP hydrolysis by mitochondrial ATP Synthase (CV) is induced by loss of proton motive force and inhibited by the mitochondrial protein ATPase inhibitor (ATPIF1). The extent of CV hydrolytic activity and its impact on cellular energetics remains unknown due to the lack of selective hydrolysis inhibitors of CV. We find that CV hydrolytic activity takes place in coupled intact mitochondria and is increased by respiratory chain defects. We identified (+)-Epicatechin as a selective inhibitor of ATP hydrolysis that binds CV while preventing the binding of ATPIF1. In cells with Complex-III deficiency, we show that inhibition of CV hydrolytic activity by (+)-Epichatechin is sufficient to restore ATP content without restoring respiratory function. Inhibition of CV-ATP hydrolysis in a mouse model of Duchenne Muscular Dystrophy is sufficient to improve muscle force without any increase in mitochondrial content. We conclude that the impact of compromised mitochondrial respiration can be lessened using hydrolysis-selective inhibitors of CV.
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Affiliation(s)
- Rebeca Acin‐Perez
- Department of Medicine, Endocrinology, David Geffen School of MedicineUniversity of CaliforniaLos AngelesCAUSA
- Metabolism Theme, David Geffen School of MedicineUniversity of CaliforniaLos AngelesCAUSA
| | - Cristiane Benincá
- Department of Medicine, Endocrinology, David Geffen School of MedicineUniversity of CaliforniaLos AngelesCAUSA
- Metabolism Theme, David Geffen School of MedicineUniversity of CaliforniaLos AngelesCAUSA
| | - Lucia Fernandez del Rio
- Department of Medicine, Endocrinology, David Geffen School of MedicineUniversity of CaliforniaLos AngelesCAUSA
- Metabolism Theme, David Geffen School of MedicineUniversity of CaliforniaLos AngelesCAUSA
| | - Cynthia Shu
- Department of Medicine, Endocrinology, David Geffen School of MedicineUniversity of CaliforniaLos AngelesCAUSA
- Metabolism Theme, David Geffen School of MedicineUniversity of CaliforniaLos AngelesCAUSA
| | - Siyouneh Baghdasarian
- Department of Medicine, Endocrinology, David Geffen School of MedicineUniversity of CaliforniaLos AngelesCAUSA
- Metabolism Theme, David Geffen School of MedicineUniversity of CaliforniaLos AngelesCAUSA
| | - Vanessa Zanette
- Department of BioinformaticsUniversity Federal of ParanaCuritibaBrazil
| | - Christoph Gerle
- Institute for Protein ResearchOsaka UniversitySuitaJapan
- RIKEN SPring‐8 CenterSayo‐gunJapan
| | - Chimari Jiko
- Institute for Integrated Radiation and Nuclear ScienceKyoto UniversityKyotoJapan
| | | | | | | | - Byourak Shabane
- Department of Medicine, Endocrinology, David Geffen School of MedicineUniversity of CaliforniaLos AngelesCAUSA
- Metabolism Theme, David Geffen School of MedicineUniversity of CaliforniaLos AngelesCAUSA
| | | | | | | | | | | | - Linsey Stiles
- Department of Medicine, Endocrinology, David Geffen School of MedicineUniversity of CaliforniaLos AngelesCAUSA
- Metabolism Theme, David Geffen School of MedicineUniversity of CaliforniaLos AngelesCAUSA
- Department of Molecular and Medical PharmacologyUniversity of CaliforniaLos AngelesCAUSA
| | - Marc Liesa
- Department of Medicine, Endocrinology, David Geffen School of MedicineUniversity of CaliforniaLos AngelesCAUSA
- Metabolism Theme, David Geffen School of MedicineUniversity of CaliforniaLos AngelesCAUSA
- Department of Molecular and Medical PharmacologyUniversity of CaliforniaLos AngelesCAUSA
- Molecular Cellular Integrative PhysiologyUniversity of CaliforniaLos AngelesCAUSA
- Institut de Biologia Molecular de Barcelona, IBMB, CSICBarcelonaCataloniaSpain
| | - Orian S Shirihai
- Department of Medicine, Endocrinology, David Geffen School of MedicineUniversity of CaliforniaLos AngelesCAUSA
- Metabolism Theme, David Geffen School of MedicineUniversity of CaliforniaLos AngelesCAUSA
- Department of Molecular and Medical PharmacologyUniversity of CaliforniaLos AngelesCAUSA
- Molecular Cellular Integrative PhysiologyUniversity of CaliforniaLos AngelesCAUSA
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3
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Kiriaev L, Baumann CW, Lindsay A. Eccentric contraction-induced strength loss in dystrophin-deficient muscle: Preparations, protocols, and mechanisms. J Gen Physiol 2023; 155:213810. [PMID: 36651896 PMCID: PMC9856740 DOI: 10.1085/jgp.202213208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Revised: 12/01/2022] [Accepted: 12/28/2022] [Indexed: 01/19/2023] Open
Abstract
The absence of dystrophin hypersensitizes skeletal muscle of lower and higher vertebrates to eccentric contraction (ECC)-induced strength loss. Loss of strength can be accompanied by transient and reversible alterations to sarcolemmal excitability and disruption, triad dysfunction, and aberrations in calcium kinetics and reactive oxygen species production. The degree of ECC-induced strength loss, however, appears dependent on several extrinsic and intrinsic factors such as vertebrate model, skeletal muscle preparation (in vivo, in situ, or ex vivo), skeletal muscle hierarchy (single fiber versus whole muscle and permeabilized versus intact), strength production, fiber branching, age, and genetic background, among others. Consistent findings across research groups show that dystrophin-deficient fast(er)-twitch muscle is hypersensitive to ECCs relative to wildtype muscle, but because preparations are highly variable and sensitivity to ECCs are used repeatedly to determine efficacy of many preclinical treatments, it is critical to evaluate the impact of skeletal muscle preparations on sensitivity to ECC-induced strength loss in dystrophin-deficient skeletal muscle. Here, we review and discuss variations in skeletal muscle preparations to evaluate the factors responsible for variations and discrepancies between research groups. We further highlight that dystrophin-deficiency, or loss of the dystrophin-glycoprotein complex in skeletal muscle, is not a prerequisite for accelerated strength loss-induced by ECCs.
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Affiliation(s)
- Leonit Kiriaev
- Muscle Research Group, Murdoch Children’s Research Institute, Parkville, Victoria, Australia,School of Medicine, Western Sydney University, Campbelltown, New South Wales, Australia
| | - Cory W. Baumann
- Ohio Musculoskeletal and Neurological Institute (OMNI), Ohio University, Athens, OH, USA,Department of Biomedical Sciences, Ohio University, Athens, OH, USA
| | - Angus Lindsay
- Institute for Physical Activity and Nutrition, School of Exercise and Nutrition Sciences, Deakin University, Geelong, Victoria, Australia,Correspondence to Angus Lindsay:
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4
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Mashinchian O, De Franceschi F, Nassiri S, Michaud J, Migliavacca E, Aouad P, Metairon S, Pruvost S, Karaz S, Fabre P, Molina T, Stuelsatz P, Hegde N, Le Moal E, Dammone G, Dumont NA, Lutolf MP, Feige JN, Bentzinger CF. An engineered multicellular stem cell niche for the 3D derivation of human myogenic progenitors from iPSCs. EMBO J 2022; 41:e110655. [PMID: 35703167 DOI: 10.15252/embj.2022110655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Revised: 04/22/2022] [Accepted: 05/11/2022] [Indexed: 11/09/2022] Open
Abstract
Fate decisions in the embryo are controlled by a plethora of microenvironmental interactions in a three-dimensional niche. To investigate whether aspects of this microenvironmental complexity can be engineered to direct myogenic human-induced pluripotent stem cell (hiPSC) differentiation, we here screened murine cell types present in the developmental or adult stem cell niche in heterotypic suspension embryoids. We identified embryonic endothelial cells and fibroblasts as highly permissive for myogenic specification of hiPSCs. After two weeks of sequential Wnt and FGF pathway induction, these three-component embryoids are enriched in Pax7-positive embryonic-like myogenic progenitors that can be isolated by flow cytometry. Myogenic differentiation of hiPSCs in heterotypic embryoids relies on a specialized structural microenvironment and depends on MAPK, PI3K/AKT, and Notch signaling. After transplantation in a mouse model of Duchenne muscular dystrophy, embryonic-like myogenic progenitors repopulate the stem cell niche, reactivate after repeated injury, and, compared to adult human myoblasts, display enhanced fusion and lead to increased muscle function. Altogether, we provide a two-week protocol for efficient and scalable suspension-based 3D derivation of Pax7-positive myogenic progenitors from hiPSCs.
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Affiliation(s)
- Omid Mashinchian
- Nestlé Research, Nestlé Institute of Health Sciences, Lausanne, Switzerland.,School of Life Sciences, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | | | - Sina Nassiri
- Bioinformatics Core Facility, SIB Swiss Institute of Bioinformatics, Lausanne, Switzerland
| | - Joris Michaud
- Nestlé Research, Nestlé Institute of Health Sciences, Lausanne, Switzerland
| | | | - Patrick Aouad
- School of Life Sciences, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Sylviane Metairon
- Nestlé Research, Nestlé Institute of Health Sciences, Lausanne, Switzerland
| | - Solenn Pruvost
- Nestlé Research, Nestlé Institute of Health Sciences, Lausanne, Switzerland
| | - Sonia Karaz
- Nestlé Research, Nestlé Institute of Health Sciences, Lausanne, Switzerland
| | - Paul Fabre
- Faculty of Medicine, CHU Sainte-Justine Research Center, School of Rehabilitation, Université de Montréal, Montreal, QC, Canada
| | - Thomas Molina
- Faculty of Medicine, CHU Sainte-Justine Research Center, School of Rehabilitation, Université de Montréal, Montreal, QC, Canada
| | - Pascal Stuelsatz
- Nestlé Research, Nestlé Institute of Health Sciences, Lausanne, Switzerland
| | - Nagabhooshan Hegde
- Nestlé Research, Nestlé Institute of Health Sciences, Lausanne, Switzerland
| | - Emmeran Le Moal
- Département de pharmacologie-physiologie, Faculté de médecine et des sciences de la santé, Centre de Recherche du CHUS, Université de Sherbrooke, Sherbrooke, QC, Canada
| | - Gabriele Dammone
- Nestlé Research, Nestlé Institute of Health Sciences, Lausanne, Switzerland
| | - Nicolas A Dumont
- Faculty of Medicine, CHU Sainte-Justine Research Center, School of Rehabilitation, Université de Montréal, Montreal, QC, Canada
| | - Matthias P Lutolf
- Laboratory of Stem Cell Bioengineering, Institute of Bioengineering, School of Life Sciences and School of Engineering, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.,Institute of Chemical Sciences and Engineering, School of Basic Science, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Jerome N Feige
- Nestlé Research, Nestlé Institute of Health Sciences, Lausanne, Switzerland.,School of Life Sciences, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - C Florian Bentzinger
- Nestlé Research, Nestlé Institute of Health Sciences, Lausanne, Switzerland.,Département de pharmacologie-physiologie, Faculté de médecine et des sciences de la santé, Centre de Recherche du CHUS, Université de Sherbrooke, Sherbrooke, QC, Canada
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5
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Baumann CW, Ingalls CP, Lowe DA. Mechanisms of weakness in Mdx muscle following in vivo eccentric contractions. J Muscle Res Cell Motil 2022; 43:63-72. [PMID: 35445349 DOI: 10.1007/s10974-022-09617-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2021] [Accepted: 03/30/2022] [Indexed: 02/03/2023]
Abstract
Skeletal muscle of the dystrophin-deficient mdx mouse is hypersensitive to eccentric (ECC) contraction-induced strength loss due to plasmalemmal electrical dysfunction. Despite plasmalemmal inexcitability being a logical mechanism responsible for weakness, it remains unclear if processes up- and/or down-stream remain functionally intact in injured mdx muscle. The purpose of this study was to analyze additional processes necessary for excitation-contraction coupling that are potentially disrupted by ECC contractions. Anterior crural muscles (tibialis anterior, extensor digitorum longus [EDL], and extensor hallucis muscles) of wildtype (WT) and mdx mice were injured in vivo with 50 ECC contractions and torque was measured immediately before and after the contraction bout. Following the in vivo assessment, EDL ex vivo isometric and caffeine forces were analyzed. In vivo isometric torque and ex vivo force in WT muscle were reduced 38 and 30% (p < 0.001), while caffeine force was also reduced (p = 0.021), albeit to a lesser degree (9%). In contrast, in vivo isometric torque, ex vivo isometric force and ex vivo caffeine-induced force were all reduced 56-67% (p < 0.001) in mdx muscle and did not differ from one another (p = 0.114). Disproportional reductions in isometric strength and caffeine-induced force confirm that ECC contractions uncoupled the plasmalemma from the ryanodine receptors (RyRs) in WT muscle. In mdx muscle, the proportional reductions in isometric strength and caffeine-induced force following ECC contractions reveal that dysfunction occurs at and/or distal to the RyRs immediately post-injury. Thus, weakness in injured mdx muscle cannot be isolated to one mechanism, rather several steps of muscle contraction are disrupted.
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Affiliation(s)
- Cory W Baumann
- Ohio Musculoskeletal and Neurological Institute (OMNI), Department of Biomedical Sciences, Ohio University, Athens, OH, USA.
| | - Christopher P Ingalls
- Department of Kinesiology and Health, Georgia State University, Atlanta, Georgia, USA
| | - Dawn A Lowe
- Division of Rehabilitation Science, Division of Physical Therapy, Department of Rehabilitation Medicine, University of Minnesota, Minneapolis, Minnesota, USA
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6
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Fabre P, Molina T, Orfi Z, Dumont NA. Assessment of Muscle Function Following hiPSC-Derived Myoblast Transplantation in Dystrophic Mice. Curr Protoc 2022; 2:e356. [PMID: 35085428 DOI: 10.1002/cpz1.356] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Muscular dystrophies are caused by genetic variants in genes encoding for proteins important for muscle structure or function, leading to a loss of muscle integrity and muscle wasting. To this day, no cure has been found for these diseases. Different therapeutic approaches are under intensive investigation. Cellular therapy has been extensively studied for diseases such as Duchenne Muscular Dystrophy, a debilitating disease caused by a mutation in the DMD gene, encoding for the dystrophin protein. Healthy myogenic cells transplanted into dystrophic muscles have the potential to engraft at long-term and fuse to donate their nuclei to the dystrophin-deficient myofibers, thereby restoring normal gene expression. Despite promising preclinical studies, the clinical trials had limited success so far due to many technical limitations. The recent technological advances in induced-pluripotent stem cells and genome editing opened new opportunities in this field. One of the keys to efficiently translate these new technologies into clinical benefits is to use relevant endpoints for preclinical studies. Considering that dystrophic muscles are susceptible to contraction-induced injury, the assessment of their resistance to repeated eccentric contractions is an optimal outcome to evaluate their functional recovery following cell transplantation. This protocol describes the procedure to generate induced-pluripotent stem cell-derived myoblasts, transplant these cells into skeletal muscle of immunosuppressed dystrophic mice, and assess muscle function in situ by measuring the resistance of the transplanted muscle to repeated eccentric contractions. © 2022 Wiley Periodicals LLC. Basic Protocol 1: Generation of hiPSC-derived myoblasts. Basic Protocol 2: Transplantation of hiPSC-derived myoblasts in skeletal muscle of dystrophic mice. Basic Protocol 3: Assessment of muscle function in situ.
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Affiliation(s)
- Paul Fabre
- CHU Sainte-Justine Research Center, Montreal, Quebec, Canada
- Department of pharmacology and physiology, Faculty of Medicine, Université de Montréal, Montreal, Quebec, Canada
| | - Thomas Molina
- CHU Sainte-Justine Research Center, Montreal, Quebec, Canada
- Department of pharmacology and physiology, Faculty of Medicine, Université de Montréal, Montreal, Quebec, Canada
| | - Zakaria Orfi
- CHU Sainte-Justine Research Center, Montreal, Quebec, Canada
- Department of pharmacology and physiology, Faculty of Medicine, Université de Montréal, Montreal, Quebec, Canada
| | - Nicolas A Dumont
- CHU Sainte-Justine Research Center, Montreal, Quebec, Canada
- School of rehabilitation, Faculty of Medicine, Université de Montréal, Montreal, Quebec, Canada
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7
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Baraldo M, Nogara L, Dumitras GA, Tchampda Dondjang AH, Geremia A, Scalabrin M, Türk C, Telkamp F, Zentilin L, Giacca M, Krüger M, Blaauw B. Raptor is critical for increasing the mitochondrial proteome and skeletal muscle force during hypertrophy. FASEB J 2021; 35:e22031. [PMID: 34767636 DOI: 10.1096/fj.202101054rr] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Revised: 10/11/2021] [Accepted: 10/22/2021] [Indexed: 12/16/2022]
Abstract
Loss of skeletal muscle mass and force is of critical importance in numerous pathologies, like age-related sarcopenia or cancer. It has been shown that the Akt-mTORC1 pathway is critical for stimulating adult muscle mass and function, however, it is unknown if mTORC1 is the only mediator downstream of Akt and which intracellular processes are required for functional muscle growth. Here, we show that loss of Raptor reduces muscle hypertrophy after Akt activation and completely prevents increases in muscle force. Interestingly, the residual hypertrophy after Raptor deletion can be completely prevented by administration of the mTORC1 inhibitor rapamycin. Using a quantitative proteomics approach we find that loss of Raptor affects the increases in mitochondrial proteins, while rapamycin mainly affects ribosomal proteins. Taken together, these results suggest that mTORC1 is the key mediator of Akt-dependent muscle growth and its regulation of the mitochondrial proteome is critical for increasing muscle force.
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Affiliation(s)
- Martina Baraldo
- Venetian Institute of Molecular Medicine (VIMM), Padova, Italy.,Department of Biomedical Sciences, University of Padova, Padova, Italy
| | - Leonardo Nogara
- Venetian Institute of Molecular Medicine (VIMM), Padova, Italy.,Department of Biomedical Sciences, University of Padova, Padova, Italy
| | | | | | - Alessia Geremia
- Venetian Institute of Molecular Medicine (VIMM), Padova, Italy.,Department of Biomedical Sciences, University of Padova, Padova, Italy
| | - Marco Scalabrin
- Department of Biomedical Sciences, University of Padova, Padova, Italy
| | - Clara Türk
- Institute for Genetics, Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany
| | - Frederik Telkamp
- Institute for Genetics, Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany
| | - Lorena Zentilin
- AAV Vector Unit, International Centre for Genetic Engineering and Biotechnology (ICGEB), Trieste, Italy
| | - Mauro Giacca
- School of Cardiovascular Medicine & Sciences, King's College London, British Heart Foundation Centre of Research Excellence, London, UK
| | - Marcus Krüger
- Institute for Genetics, Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany.,Center for Molecular Medicine (CMMC), University of Cologne, Cologne, Germany
| | - Bert Blaauw
- Venetian Institute of Molecular Medicine (VIMM), Padova, Italy.,Department of Biomedical Sciences, University of Padova, Padova, Italy
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8
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Baumann CW, Lindsay A, Sidky SR, Ervasti JM, Warren GL, Lowe DA. Contraction-Induced Loss of Plasmalemmal Electrophysiological Function Is Dependent on the Dystrophin Glycoprotein Complex. Front Physiol 2021; 12:757121. [PMID: 34764884 PMCID: PMC8576390 DOI: 10.3389/fphys.2021.757121] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2021] [Accepted: 10/05/2021] [Indexed: 02/03/2023] Open
Abstract
Weakness and atrophy are key features of Duchenne muscular dystrophy (DMD). Dystrophin is one of the many proteins within the dystrophin glycoprotein complex (DGC) that maintains plasmalemmal integrity and cellular homeostasis. The dystrophin-deficient mdx mouse is also predisposed to weakness, particularly when subjected to eccentric (ECC) contractions due to electrophysiological dysfunction of the plasmalemma. Here, we determined if maintenance of plasmalemmal excitability during and after a bout of ECC contractions is dependent on intact and functional DGCs rather than, solely, dystrophin expression. Wild-type (WT) and dystrophic mice (mdx, mL172H and Sgcb-/- mimicking Duchenne, Becker and Limb-girdle Type 2E muscular dystrophies, respectively) with varying levels of dystrophin and DGC functionality performed 50 maximal ECC contractions with simultaneous torque and electromyographic measurements (M-wave root-mean-square, M-wave RMS). ECC contractions caused all mouse lines to lose torque (p<0.001); however, deficits were greater in dystrophic mouse lines compared to WT mice (p<0.001). Loss of ECC torque did not correspond to a reduction in M-wave RMS in WT mice (p=0.080), while deficits in M-wave RMS exceeded 50% in all dystrophic mouse lines (p≤0.007). Moreover, reductions in ECC torque and M-wave RMS were greater in mdx mice compared to mL172H mice (p≤0.042). No differences were observed between mdx and Sgcb-/- mice (p≥0.337). Regression analysis revealed ≥98% of the variance in ECC torque loss could be explained by the variance in M-wave RMS in dystrophic mouse lines (p<0.001) but not within WT mice (R 2=0.211; p=0.155). By comparing mouse lines that had varying amounts and functionality of dystrophin and other DGC proteins, we observed that (1) when all DGCs are intact, plasmalemmal action potential generation and conduction is maintained, (2) deficiency of the DGC protein β-sarcoglycan is as disruptive to plasmalemmal excitability as is dystrophin deficiency and, (3) some functionally intact DGCs are better than none. Our results highlight the significant role of the DGC plays in maintaining plasmalemmal excitability and that a collective synergism (via each DGC protein) is required for this complex to function properly during ECC contractions.
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Affiliation(s)
- Cory W. Baumann
- Department of Biomedical Sciences, Ohio Musculoskeletal and Neurological Institute (OMNI), Ohio University, Athens, OH, United States
- Divisions of Rehabilitation Science and Physical Therapy, Department of Rehabilitation Medicine, University of Minnesota, Minneapolis, MN, United States
| | - Angus Lindsay
- Divisions of Rehabilitation Science and Physical Therapy, Department of Rehabilitation Medicine, University of Minnesota, Minneapolis, MN, United States
- School of Exercise and Nutrition Sciences, Institute for Physical Activity and Nutrition, Deakin University, Geelong, VIC, Australia
| | - Sylvia R. Sidky
- Divisions of Rehabilitation Science and Physical Therapy, Department of Rehabilitation Medicine, University of Minnesota, Minneapolis, MN, United States
| | - James M. Ervasti
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, MN, United States
| | - Gordon L. Warren
- Department of Physical Therapy, Georgia State University, Atlanta, GA, United States
| | - Dawn A. Lowe
- Divisions of Rehabilitation Science and Physical Therapy, Department of Rehabilitation Medicine, University of Minnesota, Minneapolis, MN, United States
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9
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Scano M, Benetollo A, Nogara L, Bondì M, Barba FD, Soardi M, Furlan S, Akyurek EE, Caccin P, Carotti M, Sacchetto R, Blaauw B, Sandonà D. CFTR corrector C17 is effective in muscular dystrophy, in vivo proof of concept in LGMDR3. Hum Mol Genet 2021; 31:499-509. [PMID: 34505136 PMCID: PMC8863415 DOI: 10.1093/hmg/ddab260] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Revised: 08/23/2021] [Accepted: 09/02/2021] [Indexed: 11/13/2022] Open
Abstract
Limb-girdle muscular dystrophy R3 (LGMDR3) is caused by mutations in the SGCA gene coding for α-sarcoglycan (SG). Together with β- γ- and δ-SG, α-SG forms a tetramer embedded in the dystrophin associated protein complex crucial for protecting the sarcolemma from mechanical stresses elicited by muscle contraction. Most LGMDR3 cases are due to missense mutations, which result in non-properly folded, even though potentially functional α-SG. These mutants are prematurely discarded by the cell quality control. Lacking one subunit, the SG-complex is disrupted. The resulting loss of function leads to sarcolemma instability, muscle fiber damage and progressive limb muscle weakness. LGMDR3 is severely disabling and, unfortunately, still incurable. Here, we propose the use of small molecules, belonging to the class of cystic fibrosis transmembrane regulator (CFTR) correctors, for recovering mutants of α-SG defective in folding and trafficking. Specifically, CFTR corrector C17 successfully rerouted the SG-complex containing the human R98H-α-SG to the sarcolemma of hind-limb muscles of a novel LGMDR3 murine model. Notably, the muscle force of the treated model animals was fully recovered. To our knowledge, this is the first time that a compound designated for cystic fibrosis is successfully tested in a muscular dystrophy and may represent a novel paradigm of treatment for LGMDR3 as well as different other indications in which a potentially functional protein is prematurely discarded as folding-defective. Furthermore, the use of small molecules for recovering the endogenous mutated SG has an evident advantage over complex procedures such as gene or cell transfer.
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Affiliation(s)
- Martina Scano
- Department of Biomedical Sciences, University of Padova, Italy
| | | | - Leonardo Nogara
- Venetian Institute of Molecular Medicine, University of Padova, Italy
| | - Michela Bondì
- Department of Biomedical Sciences, University of Padova, Italy
| | | | - Michela Soardi
- Department of Biomedical Sciences, University of Padova, Italy
| | - Sandra Furlan
- Neuroscience Institute - Italian National Research Council (CNR), Italy
| | - Eylem Emek Akyurek
- Department of Comparative Biomedicine and Food Science, University of Padova, Italy
| | - Paola Caccin
- Department of Biomedical Sciences, University of Padova, Italy
| | | | - Roberta Sacchetto
- Department of Comparative Biomedicine and Food Science, University of Padova, Italy
| | - Bert Blaauw
- Department of Biomedical Sciences, University of Padova, Italy.,Venetian Institute of Molecular Medicine, University of Padova, Italy
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10
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Bardakov SN, Deev RV, Magomedova RM, Umakhanova ZR, Allamand V, Gartioux C, Zulfugarov KZ, Akhmedova PG, Tsargush VA, Titova AA, Mavlikeev MO, Zorin VL, Chernets EN, Dalgatov GD, Konovalov FA, Isaev AA. Intrafamilial Phenotypic Variability of Collagen VI-Related Myopathy Due to a New Mutation in the COL6A1 Gene. J Neuromuscul Dis 2020; 8:273-285. [PMID: 33337382 PMCID: PMC8075389 DOI: 10.3233/jnd-200476] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Abstract
A family of five male siblings (three survivors at 48, 53 and 58 years old; two deceased at 8 months old and 2.5 years old) demonstrating significant phenotypic variability ranging from intermediate to the myosclerotic like Bethlem myopathy is presented. Whole-exome sequencing (WES) identified a new homozygous missense mutation chr21:47402679 T > C in the canonical splice donor site of the second intron (c.227 + 2T>C) in the COL6A1 gene. mRNA analysis confirmed skipping of exon 2 encoding 925 amino-acids in 94–95% of resulting transcripts. Three sibs presented with intermediate phenotype of collagen VI-related dystrophies (48, 53 and 2.5 years old) while the fourth sibling (58 years old) was classified as Bethlem myopathy with spine rigidity. The two older siblings with the moderate progressive phenotype (48 and 53 years old) lost their ability to maintain a vertical posture caused by pronounced contractures of large joints, but continued to ambulate throughout life on fully bent legs without auxiliary means of support. Immunofluorescence analysis of dermal fibroblasts demonstrated that no type VI collagen was secreted in any of the siblings’ cells, regardless of clinical manifestations severity while fibroblast proliferation and colony formation ability was decreased. The detailed genetic and long term clinical data contribute to broadening the genotypic and phenotypic spectrum of COL6A1 related disease.
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Affiliation(s)
| | - Roman V Deev
- Human Stem Cells Institute, Moscow, Russia.,I.I. Mechnikov North-Western State Medical University, St. Petersburg, Russia
| | | | | | - Valérie Allamand
- Sorbonne Université UPMC Paris 06 -Inserm UMRS974, Research Center in Myology, Hospital Pitié-Salpêtrière, Paris, France
| | - Corine Gartioux
- Sorbonne Université UPMC Paris 06 -Inserm UMRS974, Research Center in Myology, Hospital Pitié-Salpêtrière, Paris, France
| | | | | | | | - Angelina A Titova
- Institute of Fundamental Medicine and Biology, Kazan (Volga Region) Federal University, Kazan, Russia
| | - Mikhail O Mavlikeev
- I.I. Mechnikov North-Western State Medical University, St. Petersburg, Russia
| | | | | | - Gimat D Dalgatov
- Scientific-Clinical Center of Otorhinolaryngology FMBA of Russia Moscow, Russia
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11
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Himori K, Ashida Y, Tatebayashi D, Abe M, Saito Y, Chikenji T, Westerblad H, Andersson DC, Yamada T. Eccentric Resistance Training Ameliorates Muscle Weakness in a Mouse Model of Idiopathic Inflammatory Myopathies. Arthritis Rheumatol 2020; 73:848-857. [PMID: 33191613 DOI: 10.1002/art.41594] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Accepted: 11/10/2020] [Indexed: 01/19/2023]
Abstract
OBJECTIVE High-force eccentric contractions (ECCs) have traditionally been excluded from rehabilitation programs that include patients with idiopathic inflammatory myopathies (IIMs) due to unverified fear of causing muscle damage and inflammation. In an IIM animal model that used mice with experimental autoimmune myositis (EAM), we undertook this study to investigate whether ECC training can safely and effectively be used to counteract muscle weakness in IIM. METHODS EAM was induced in BALB/c mice by immunization with 3 injections of myosin emulsified in Freund's complete adjuvant. Controls (n = 12) and mice with EAM (n = 12) were exposed to either an acute bout of 100 ECCs or 4 weeks of ECC training (20 ECCs every other day). To induce ECCs, plantar flexor muscles were electrically stimulated while the ankle was forcibly dorsiflexed. RESULTS Less cell damage, as assessed by Evans blue dye uptake, was observed in the muscles of mice with EAM, compared to controls, after an acute bout of 100 ECCs (P < 0.05). Maximum Ca2+ -activated force was decreased in skinned gastrocnemius muscle fibers from mice with EAM, and this was accompanied by increased expression of endoplasmic reticulum (ER) stress proteins, including Gsp78 and Gsp94 (P < 0.05). ECC training prevented the decrease in force and the increase in ER stress proteins and also enhanced the expression and myofibrillar binding of small heat-shock proteins (HSPs) (P < 0.05), which can stabilize myofibrillar structure and function. CONCLUSION ECC training protected against the reduction in myofibrillar force-generating capacity in an IIM mouse model, and this occurred via inhibition of ER stress responses and small HSP-mediated myofibrillar stabilization.
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Affiliation(s)
- Koichi Himori
- Sapporo Medical University, Sapporo, Japan, and the Japan Society for the Promotion of Science, Tokyo, Japan
| | - Yuki Ashida
- Sapporo Medical University, Sapporo, Japan, and the Japan Society for the Promotion of Science, Tokyo, Japan
| | | | - Masami Abe
- Sapporo Medical University, Sapporo, Japan
| | - Yuki Saito
- Sapporo Medical University, Sapporo, Japan
| | - Takako Chikenji
- Sapporo Medical University and Hokkaido University, Sapporo, Japan
| | | | - Daniel C Andersson
- Karolinska Institutet, Stockholm, Sweden, and Karolinska University Hospital, Solna, Sweden
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12
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Baumann CW, Warren GL, Lowe DA. Plasmalemma Function Is Rapidly Restored in Mdx Muscle after Eccentric Contractions. Med Sci Sports Exerc 2020; 52:354-361. [PMID: 31415447 DOI: 10.1249/mss.0000000000002126] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
PURPOSE Muscle that lacks dystrophin, as in the mdx mouse, has a heightened sensitivity to eccentric (ECC) contraction-induced strength loss but an enhanced rate of recovery. However, the timeline and mechanisms underlying why mdx muscle recovers quicker have yet to be determined. We used an EMG approach to analyze plasmalemma electrophysiological function during and after ECC contraction-induced injury to test the hypothesis that loss of plasmalemmal excitability is a transient event in mdx muscle. METHODS Mice were implanted with stimulating electrodes on the common peroneal nerve and EMG electrodes on the tibialis anterior muscle. Anterior crural muscles of anesthetized mice performed one or two bouts of 50 injurious ECC contractions, and recovery of maximal isometric torque and M-wave root mean square (RMS) were assessed after each bout. RESULTS Maximal isometric torque and M-wave RMS were equally reduced 62% (P < 0.001) in mdx mice immediately after the initial ECC injury. For these mdx mice, M-wave RMS was still reduced at 2 d postinjury (P = 0.034) but was not different from preinjury values by 6 d (P = 0.106), whereas torque took up to 9 d to recover (P = 0.333). M-wave RMS did not change (P = 0.390) in wild-type mice in response to ECC injury, whereas torque decreased 35% (P < 0.001) and recovered by day 2 (P = 0.311). Results from the second bout of ECC contractions were similar to those observed during and after the initial injury. CONCLUSION Functional dystrophin is necessary for excitation to occur at the plasmalemma during ECC contractions but is not essential for the complete recovery of plasmalemma electrophysiological function or maximal isometric strength.
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Affiliation(s)
- Cory W Baumann
- Divisions of Rehabilitation Science and Physical Therapy, Department of Rehabilitation Medicine, Medical School, University of Minnesota, Minneapolis, MN
| | - Gordon L Warren
- Department of Physical Therapy, Georgia State University, Atlanta, GA
| | - Dawn A Lowe
- Divisions of Rehabilitation Science and Physical Therapy, Department of Rehabilitation Medicine, Medical School, University of Minnesota, Minneapolis, MN
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13
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Asher DR, Thapa K, Dharia SD, Khan N, Potter RA, Rodino-Klapac LR, Mendell JR. Clinical development on the frontier: gene therapy for duchenne muscular dystrophy. Expert Opin Biol Ther 2020; 20:263-274. [PMID: 32031420 DOI: 10.1080/14712598.2020.1725469] [Citation(s) in RCA: 48] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Introduction: The development of adeno-associated virus (AAV) vectors as safe vehicles for in vivo delivery of therapeutic genes has been a major milestone in the advancement of gene therapy, enabling a promising strategy for ameliorating a wide range of diseases, including Duchenne muscular dystrophy (DMD).Areas covered: Based on experience with the development of a gene transfer therapy agent for DMD, we discuss ways in which gene therapy for rare disease challenges traditional clinical development paradigms, and recommend a step-wise approach for design and evaluation to support broader applicability of gene therapy.Expert opinion: The gene therapy development approach should intentionally design the therapeutic construct and the clinical study to systematically evaluate agent delivery, safety, and efficacy. Rigorous preclinical work is essential for establishing an effective gene delivery platform and determining the efficacious dose. Clinical studies should thoroughly evaluate transduction, on-target transgene expression at the tissue and cellular level, and functional efficacy.
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Affiliation(s)
- Damon R Asher
- Sarepta Therapeutics, Inc, Cambridge, Massachusetts, USA
| | | | - Sachi D Dharia
- Sarepta Therapeutics, Inc, Cambridge, Massachusetts, USA
| | - Navid Khan
- Sarepta Therapeutics, Inc, Cambridge, Massachusetts, USA
| | | | | | - Jerry R Mendell
- Center for Gene Therapy, The Abigail Wexner, Research Institute at Nationwide Children's Hospital, Columbus, Ohio, USA.,Department of Pediatrics and Neurology, The Ohio State University, Columbus, Ohio, USA
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14
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Himori K, Tatebayashi D, Ashida Y, Yamada T. Eccentric training enhances the αB-crystallin binding to the myofibrils and prevents skeletal muscle weakness in adjuvant-induced arthritis rat. J Appl Physiol (1985) 2019; 127:71-80. [DOI: 10.1152/japplphysiol.00102.2019] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Patients with rheumatoid arthritis (RA) frequently suffer from muscle weakness. We examined whether eccentric training prevents skeletal muscle weakness in adjuvant-induced arthritis (AIA) rat, a widely used animal model for RA. AIA was induced in the knees of Wistar rats by injection of complete Freund’s adjuvant. To induce eccentric contractions (ECCs), neuromuscular electrical stimulation (45 V) was applied to the plantar flexor muscles simultaneously with forced dorsiflexion of the ankle joint (0–40°) and was given every 6 s. ECC exercise was applied every other day for a total of 11 sessions and consisted of 4 sets of 5 contractions. There was a significant reduction in in vitro maximum Ca2+-activated force in skinned fibers in gastrocnemius muscle from AIA rats. These changes were associated with reduced expression levels of contractile proteins (i.e., myosin and actin), increased levels of inflammation redox stress-related biomarkers (i.e., TNF-α, malondialdehyde-protein adducts, NADPH oxidase 2, and neuronal nitric oxide synthase), and autolyzed active calpain-1 in AIA muscles. ECC training markedly enhanced the steady-state levels of αB-crystallin, a small heat shock protein, and its binding to the myofibrils and prevented the AIA-induced myofibrillar dysfunction, reduction in contractile proteins, and inflammation-oxidative stress insults. Our findings demonstrate that ECC training preserves myofibrillar function without muscle damage in AIA rats, which is at least partially attributable to the protective effect of αB-crystallin on the myofibrils against oxidative stress-mediated protein degeneration. Thus ECC training can be a safe and effective intervention, counteracting the loss of muscle strength in RA patients. NEW & NOTEWORTHY Eccentric contractions (ECCs) are regarded as an effective way to increase muscle strength. No studies, however, assess safety and effectiveness of ECC training on muscle weakness associated with rheumatoid arthritis. Here, we used adjuvant-induced arthritis (AIA) rats to demonstrate that ECC training prevents intrinsic contractile dysfunction without muscle damage in AIA rats, which may be attributed to the protective effect of αB-crystallin on the myofibrils against inflammation-oxidative stress insults.
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Affiliation(s)
- Koichi Himori
- Graduate School of Health Sciences, Sapporo Medical University, Sapporo, Japan
| | - Daisuke Tatebayashi
- Graduate School of Health Sciences, Sapporo Medical University, Sapporo, Japan
| | - Yuki Ashida
- Graduate School of Health Sciences, Sapporo Medical University, Sapporo, Japan
| | - Takashi Yamada
- Graduate School of Health Sciences, Sapporo Medical University, Sapporo, Japan
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15
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Physical exertion exacerbates decline in the musculature of an animal model of Duchenne muscular dystrophy. Proc Natl Acad Sci U S A 2019; 116:3508-3517. [PMID: 30755520 DOI: 10.1073/pnas.1811379116] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Duchenne muscular dystrophy (DMD) is a genetic disorder caused by loss of the protein dystrophin. In humans, DMD has early onset, causes developmental delays, muscle necrosis, loss of ambulation, and death. Current animal models have been challenged by their inability to model the early onset and severity of the disease. It remains unresolved whether increased sarcoplasmic calcium observed in dystrophic muscles follows or leads the mechanical insults caused by the muscle's disrupted contractile machinery. This knowledge has important implications for patients, as potential physiotherapeutic treatments may either help or exacerbate symptoms, depending on how dystrophic muscles differ from healthy ones. Recently we showed how burrowing dystrophic (dys-1) C. elegans recapitulate many salient phenotypes of DMD, including loss of mobility and muscle necrosis. Here, we report that dys-1 worms display early pathogenesis, including dysregulated sarcoplasmic calcium and increased lethality. Sarcoplasmic calcium dysregulation in dys-1 worms precedes overt structural phenotypes (e.g., mitochondrial, and contractile machinery damage) and can be mitigated by reducing calmodulin expression. To learn how dystrophic musculature responds to altered physical activity, we cultivated dys-1 animals in environments requiring high intensity or high frequency of muscle exertion during locomotion. We find that several muscular parameters (e.g., size) improve with increased activity. However, longevity in dystrophic animals was negatively associated with muscular exertion, regardless of effort duration. The high degree of phenotypic conservation between dystrophic worms and humans provides a unique opportunity to gain insight into the pathology of the disease as well as the initial assessment of potential treatment strategies.
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16
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Olthoff JT, Lindsay A, Abo-Zahrah R, Baltgalvis KA, Patrinostro X, Belanto JJ, Yu DY, Perrin BJ, Garry DJ, Rodney GG, Lowe DA, Ervasti JM. Loss of peroxiredoxin-2 exacerbates eccentric contraction-induced force loss in dystrophin-deficient muscle. Nat Commun 2018; 9:5104. [PMID: 30504831 PMCID: PMC6269445 DOI: 10.1038/s41467-018-07639-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2018] [Accepted: 11/14/2018] [Indexed: 12/28/2022] Open
Abstract
Force loss in skeletal muscle exposed to eccentric contraction is often attributed to injury. We show that EDL muscles from dystrophin-deficient mdx mice recover 65% of lost force within 120 min of eccentric contraction and exhibit minimal force loss when the interval between contractions is increased from 3 to 30 min. A proteomic screen of mdx muscle identified an 80% reduction in the antioxidant peroxiredoxin-2, likely due to proteolytic degradation following hyperoxidation by NADPH Oxidase 2. Eccentric contraction-induced force loss in mdx muscle was exacerbated by peroxiredoxin-2 ablation, and improved by peroxiredoxin-2 overexpression or myoglobin knockout. Finally, overexpression of γcyto- or βcyto-actin protects mdx muscle from eccentric contraction-induced force loss by blocking NADPH Oxidase 2 through a mechanism dependent on cysteine 272 unique to cytoplasmic actins. Our data suggest that eccentric contraction-induced force loss may function as an adaptive circuit breaker that protects mdx muscle from injurious contractions.
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Affiliation(s)
- John T Olthoff
- Molecular, Cellular, Developmental Biology, and Genetics Graduate Program, University of Minnesota, Minneapolis, MN, 55455, USA
| | - Angus Lindsay
- Divisions of Rehabilitation Science and Physical Therapy, Department of Rehabilitation Medicine, University of Minnesota, Minneapolis, MN, 55455, USA
| | - Reem Abo-Zahrah
- Department of Molecular Physiology and Biophysics, Baylor College of Medicine, Houston, TX, 77030, USA
| | - Kristen A Baltgalvis
- Divisions of Rehabilitation Science and Physical Therapy, Department of Rehabilitation Medicine, University of Minnesota, Minneapolis, MN, 55455, USA
| | - Xiaobai Patrinostro
- Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, MN, 55455, USA
| | - Joseph J Belanto
- Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, MN, 55455, USA
| | - Dae-Yeul Yu
- Aging Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon, Republic of Korea
| | - Benjamin J Perrin
- Department of Biology, Indiana University-Purdue University Indianapolis, Indianapolis, IN, 46022, USA
| | - Daniel J Garry
- Lillehei Heart Institute and Department of Medicine, University of Minnesota, Minneapolis, MN, 55455, USA
| | - George G Rodney
- Department of Molecular Physiology and Biophysics, Baylor College of Medicine, Houston, TX, 77030, USA
| | - Dawn A Lowe
- Divisions of Rehabilitation Science and Physical Therapy, Department of Rehabilitation Medicine, University of Minnesota, Minneapolis, MN, 55455, USA
| | - James M Ervasti
- Molecular, Cellular, Developmental Biology, and Genetics Graduate Program, University of Minnesota, Minneapolis, MN, 55455, USA.
- Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, MN, 55455, USA.
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17
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Delacroix C, Hyzewicz J, Lemaitre M, Friguet B, Li Z, Klein A, Furling D, Agbulut O, Ferry A. Improvement of Dystrophic Muscle Fragility by Short-Term Voluntary Exercise through Activation of Calcineurin Pathway in mdx Mice. THE AMERICAN JOURNAL OF PATHOLOGY 2018; 188:2662-2673. [PMID: 30142334 DOI: 10.1016/j.ajpath.2018.07.015] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2018] [Revised: 06/23/2018] [Accepted: 07/16/2018] [Indexed: 01/01/2023]
Abstract
Dystrophin deficiency in mdx mice, a model for Duchenne muscular dystrophy, leads to muscle weakness revealed by a reduced specific maximal force as well as fragility (ie, higher susceptibility to contraction-induced injury, as shown by a greater force decrease after lengthening contractions). Both symptoms could be improved with dystrophin restoration-based therapies and long-term (months) voluntary exercise. Herein, we evaluated the effect of short-term (1-week) voluntary wheel running. We found that running improved fragility of tibialis anterior muscle (TA), but not plantaris muscle, independently of utrophin up-regulation, without affecting weakness. Moreover, TA muscle excitability was also preserved by running, as shown by compound muscle action potential measurements after lengthening contractions. Of interest, the calcineurin inhibitor cyclosporin A prevented the effect of running on both muscle fragility and excitability. Cyclosporin also prevented the running-induced changes in expression of genes involved in excitability (Scn4a and Cacna1s) and slower contractile phenotype (Myh2 and Tnni1) in TA muscle. In conclusion, short-term voluntary exercise improves TA muscle fragility in mdx mice, without worsening weakness. Its effect was related to preserved excitability, calcineurin pathway activation, and changes in the program of genes involved in excitability and slower contractile phenotype. Thus, remediation of muscle fragility of Duchenne muscular dystrophy patients through appropriate exercise training deserves to be explored in more detail.
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Affiliation(s)
- Clement Delacroix
- Research Center in Myology, Association Institute of Myology, Sorbonne University, INSERM, UMRS974, Paris, France
| | - Janek Hyzewicz
- Biological Adaptation and Aging, Institute of Biology Paris-Seine, UMR CNRS 8256, INSERM ERL U1164, Sorbonne University, Paris, France
| | - Megane Lemaitre
- Research Center in Myology, Association Institute of Myology, Sorbonne University, INSERM, UMRS974, Paris, France
| | - Bertrand Friguet
- Biological Adaptation and Aging, Institute of Biology Paris-Seine, UMR CNRS 8256, INSERM ERL U1164, Sorbonne University, Paris, France
| | - Zhenlin Li
- Biological Adaptation and Aging, Institute of Biology Paris-Seine, UMR CNRS 8256, INSERM ERL U1164, Sorbonne University, Paris, France
| | - Arnaud Klein
- Research Center in Myology, Association Institute of Myology, Sorbonne University, INSERM, UMRS974, Paris, France
| | - Denis Furling
- Research Center in Myology, Association Institute of Myology, Sorbonne University, INSERM, UMRS974, Paris, France
| | - Onnik Agbulut
- Biological Adaptation and Aging, Institute of Biology Paris-Seine, UMR CNRS 8256, INSERM ERL U1164, Sorbonne University, Paris, France
| | - Arnaud Ferry
- Research Center in Myology, Association Institute of Myology, Sorbonne University, INSERM, UMRS974, Paris, France; Paris Descartes University, Sorbonne Paris Cité, Paris, France.
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18
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Vitiello L, Marabita M, Sorato E, Nogara L, Forestan G, Mouly V, Salviati L, Acosta M, Blaauw B, Canton M. Drug Repurposing for Duchenne Muscular Dystrophy: The Monoamine Oxidase B Inhibitor Safinamide Ameliorates the Pathological Phenotype in mdx Mice and in Myogenic Cultures From DMD Patients. Front Physiol 2018; 9:1087. [PMID: 30154729 PMCID: PMC6102489 DOI: 10.3389/fphys.2018.01087] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2018] [Accepted: 07/23/2018] [Indexed: 12/11/2022] Open
Abstract
Oxidative stress and mitochondrial dysfunction play a crucial role in the pathophysiology of muscular dystrophies. We previously reported that the mitochondrial enzyme monoamine oxidase (MAO) is a relevant source of reactive oxygen species (ROS) not only in murine models of muscular dystrophy, in which it directly contributes to contractile impairment, but also in muscle cells from collagen VI-deficient patients. Here, we now assessed the efficacy of a novel MAO-B inhibitor, safinamide, using in vivo and in vitro models of Duchenne muscular dystrophy (DMD). Specifically, we found that administration of safinamide in 3-month-old mdx mice reduced myofiber damage and oxidative stress and improved muscle functionality. In vitro studies with myogenic cultures from mdx mice and DMD patients showed that even cultured dystrophic myoblasts were more susceptible to oxidative stress than matching cells from healthy donors. Indeed, upon exposure to the MAO substrate tyramine or to hydrogen peroxide, DMD muscle cells displayed a rise in ROS levels and a consequent mitochondrial depolarization. Remarkably, both phenotypes normalized when cultures were treated with safinamide. Given that safinamide is already in clinical use for neurological disorders, our findings could pave the way toward a promising translation into clinical trials for DMD patients as a classic case of drug repurposing.
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Affiliation(s)
- Libero Vitiello
- Department of Biology, University of Padova, Padova, Italy.,Interuniversity Institute of Myology, Padova, Italy
| | | | - Elisa Sorato
- Department of Biomedical Sciences, University of Padova, Padova, Italy
| | - Leonardo Nogara
- Venetian Institute of Molecular Medicine (VIMM), Padova, Italy
| | - Giada Forestan
- Department of Biomedical Sciences, University of Padova, Padova, Italy
| | - Vincent Mouly
- UMRS 974 UPMC-INSERM, Center for Research in Myology, Paris, France
| | - Leonardo Salviati
- Fondazione Istituto di Ricerca Pediatrica Città della Speranza - IRP, Padova, Italy
| | - Manuel Acosta
- Fondazione Istituto di Ricerca Pediatrica Città della Speranza - IRP, Padova, Italy
| | - Bert Blaauw
- Interuniversity Institute of Myology, Padova, Italy.,Venetian Institute of Molecular Medicine (VIMM), Padova, Italy.,Department of Biomedical Sciences, University of Padova, Padova, Italy
| | - Marcella Canton
- Venetian Institute of Molecular Medicine (VIMM), Padova, Italy.,Department of Biomedical Sciences, University of Padova, Padova, Italy.,Fondazione Istituto di Ricerca Pediatrica Città della Speranza - IRP, Padova, Italy
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19
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Dufresne SS, Boulanger-Piette A, Bossé S, Argaw A, Hamoudi D, Marcadet L, Gamu D, Fajardo VA, Yagita H, Penninger JM, Russell Tupling A, Frenette J. Genetic deletion of muscle RANK or selective inhibition of RANKL is not as effective as full-length OPG-fc in mitigating muscular dystrophy. Acta Neuropathol Commun 2018; 6:31. [PMID: 29699580 PMCID: PMC5922009 DOI: 10.1186/s40478-018-0533-1] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2018] [Accepted: 04/10/2018] [Indexed: 01/13/2023] Open
Abstract
Although there is a strong association between osteoporosis and skeletal muscle atrophy/dysfunction, the functional relevance of a particular biological pathway that regulates synchronously bone and skeletal muscle physiopathology is still elusive. Receptor-activator of nuclear factor κB (RANK), its ligand RANKL and the soluble decoy receptor osteoprotegerin (OPG) are the key regulators of osteoclast differentiation and bone remodelling. We thus hypothesized that RANK/RANKL/OPG, which is a key pathway for bone regulation, is involved in Duchenne muscular dystrophy (DMD) physiopathology. Our results show that muscle-specific RANK deletion (mdx-RANKmko) in dystrophin deficient mdx mice improves significantly specific force [54% gain in force] of EDL muscles with no protective effect against eccentric contraction-induced muscle dysfunction. In contrast, full-length OPG-Fc injections restore the force of dystrophic EDL muscles [162% gain in force], protect against eccentric contraction-induced muscle dysfunction ex vivo and significantly improve functional performance on downhill treadmill and post-exercise physical activity. Since OPG serves a soluble receptor for RANKL and as a decoy receptor for TRAIL, mdx mice were injected with anti-RANKL and anti-TRAIL antibodies to decipher the dual function of OPG. Injections of anti-RANKL and/or anti-TRAIL increase significantly the force of dystrophic EDL muscle [45% and 17% gains in force, respectively]. In agreement, truncated OPG-Fc that contains only RANKL domains produces similar gains, in terms of force production, than anti-RANKL treatments. To corroborate that full-length OPG-Fc also acts independently of RANK/RANKL pathway, dystrophin/RANK double-deficient mice were treated with full-length OPG-Fc for 10 days. Dystrophic EDL muscles exhibited a significant gain in force relative to untreated dystrophin/RANK double-deficient mice, indicating that the effect of full-length OPG-Fc is in part independent of the RANKL/RANK interaction. The sarco/endoplasmic reticulum Ca2+ ATPase (SERCA) activity is significantly depressed in dysfunctional and dystrophic muscles and full-length OPG-Fc treatment increased SERCA activity and SERCA-2a expression. These findings demonstrate the superiority of full-length OPG-Fc treatment relative to truncated OPG-Fc, anti-RANKL, anti-TRAIL or muscle RANK deletion in improving dystrophic muscle function, integrity and protection against eccentric contractions. In conclusion, full-length OPG-Fc represents an efficient alternative in the development of new treatments for muscular dystrophy in which a single therapeutic approach may be foreseeable to maintain both bone and skeletal muscle functions.
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20
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Coenen-Stass AML, Betts CA, Lee YF, Mäger I, Turunen MP, El Andaloussi S, Morgan JE, Wood MJA, Roberts TC. Selective release of muscle-specific, extracellular microRNAs during myogenic differentiation. Hum Mol Genet 2016; 25:3960-3974. [PMID: 27466195 PMCID: PMC5291232 DOI: 10.1093/hmg/ddw237] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2016] [Revised: 05/11/2016] [Accepted: 07/11/2016] [Indexed: 01/06/2023] Open
Abstract
MyomiRs are muscle-specific microRNAs (miRNAs) that regulate myoblast proliferation and differentiation. Extracellular myomiRs (ex-myomiRs) are highly enriched in the serum of Duchenne Muscular Dystrophy (DMD) patients and dystrophic mouse models and consequently have potential as disease biomarkers. The biological significance of miRNAs present in the extracellular space is not currently well understood. Here we demonstrate that ex-myomiR levels are elevated in perinatal muscle development, during the regenerative phase that follows exercise-induced myoinjury, and concomitant with myoblast differentiation in culture. Whereas ex-myomiRs are progressively and specifically released by differentiating human primary myoblasts and C2C12 cultures, chemical induction of apoptosis in C2C12 cells results in indiscriminate miRNA release. The selective release of myomiRs as a consequence of cellular differentiation argues against the idea that they are solely waste products of muscle breakdown, and suggests they may serve a biological function in specific physiological contexts. Ex-myomiRs in culture supernatant and serum are predominantly non-vesicular, and their release is independent of ceramide-mediated vesicle secretion. Furthermore, ex-myomiRs levels are reduced in aged dystrophic mice, likely as a consequence of chronic muscle wasting. In conclusion, we show that myomiR release accompanies periods of myogenic differentiation in cell culture and in vivo. Serum myomiR abundance is therefore a function of the regenerative/degenerative status of the muscle, overall muscle mass, and tissue expression levels. These findings have implications for the use of ex-myomiRs as biomarkers for DMD disease progression and monitoring response to therapy.
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Affiliation(s)
- Anna M L Coenen-Stass
- Department of Physiology, Anatomy and Genetics, University of Oxford, South Parks Road, Oxford OX1 3QX, UK
| | - Corinne A Betts
- Department of Physiology, Anatomy and Genetics, University of Oxford, South Parks Road, Oxford OX1 3QX, UK
| | - Yi F Lee
- Department of Physiology, Anatomy and Genetics, University of Oxford, South Parks Road, Oxford OX1 3QX, UK
- Department of Laboratory Medicine, Karolinska Institutet, Stockholm SE-141 57, Sweden
| | - Imre Mäger
- Department of Physiology, Anatomy and Genetics, University of Oxford, South Parks Road, Oxford OX1 3QX, UK
- Institute of Technology, University of Tartu, Nooruse 1, 50411 Tartu, Estonia
| | - Mikko P Turunen
- Department of Biotechnology and Molecular Medicine, A.I. Virtanen Institute, University of Eastern Finland, 70150 Kuopio, Finland
| | - Samir El Andaloussi
- Department of Physiology, Anatomy and Genetics, University of Oxford, South Parks Road, Oxford OX1 3QX, UK
- Department of Laboratory Medicine, Karolinska Institutet, Stockholm SE-141 57, Sweden
| | - Jennifer E Morgan
- The Dubowitz Neuromuscular Centre, Molecular Neurosciences Section, Developmental Neurosciences Programme, UCL Institute of Child Health, London WC1N 1EH, UK
| | - Matthew J A Wood
- Department of Physiology, Anatomy and Genetics, University of Oxford, South Parks Road, Oxford OX1 3QX, UK
| | - Thomas C Roberts
- Department of Physiology, Anatomy and Genetics, University of Oxford, South Parks Road, Oxford OX1 3QX, UK
- Sanford Burnham Prebys Medical Discovery Institute, Development, Aging and Regeneration Program, La Jolla, CA 92037, USA
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21
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Role of dystroglycan in limiting contraction-induced injury to the sarcomeric cytoskeleton of mature skeletal muscle. Proc Natl Acad Sci U S A 2016; 113:10992-7. [PMID: 27625424 DOI: 10.1073/pnas.1605265113] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Dystroglycan (DG) is a highly expressed extracellular matrix receptor that is linked to the cytoskeleton in skeletal muscle. DG is critical for the function of skeletal muscle, and muscle with primary defects in the expression and/or function of DG throughout development has many pathological features and a severe muscular dystrophy phenotype. In addition, reduction in DG at the sarcolemma is a common feature in muscle biopsies from patients with various types of muscular dystrophy. However, the consequence of disrupting DG in mature muscle is not known. Here, we investigated muscles of transgenic mice several months after genetic knockdown of DG at maturity. In our study, an increase in susceptibility to contraction-induced injury was the first pathological feature observed after the levels of DG at the sarcolemma were reduced. The contraction-induced injury was not accompanied by increased necrosis, excitation-contraction uncoupling, or fragility of the sarcolemma. Rather, disruption of the sarcomeric cytoskeleton was evident as reduced passive tension and decreased titin immunostaining. These results reveal a role for DG in maintaining the stability of the sarcomeric cytoskeleton during contraction and provide mechanistic insight into the cause of the reduction in strength that occurs in muscular dystrophy after lengthening contractions.
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22
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Roy P, Rau F, Ochala J, Messéant J, Fraysse B, Lainé J, Agbulut O, Butler-Browne G, Furling D, Ferry A. Dystrophin restoration therapy improves both the reduced excitability and the force drop induced by lengthening contractions in dystrophic mdx skeletal muscle. Skelet Muscle 2016; 6:23. [PMID: 27441081 PMCID: PMC4952281 DOI: 10.1186/s13395-016-0096-4] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2016] [Accepted: 06/11/2016] [Indexed: 12/16/2022] Open
Abstract
Background The greater susceptibility to contraction-induced skeletal muscle injury (fragility) is an important dystrophic feature and tool for testing preclinic dystrophin-based therapies for Duchenne muscular dystrophy. However, how these therapies reduce the muscle fragility is not clear. Methods To address this question, we first determined the event(s) of the excitation-contraction cycle which is/are altered following lengthening (eccentric) contractions in the mdx muscle. Results We found that the immediate force drop following lengthening contractions, a widely used measure of muscle fragility, was associated with reduced muscle excitability. Moreover, the force drop can be mimicked by an experimental reduction in muscle excitation of uninjured muscle. Furthermore, the force drop was not related to major neuromuscular transmission failure, excitation-contraction uncoupling, and myofibrillar impairment. Secondly, and importantly, the re-expression of functional truncated dystrophin in the muscle of mdx mice using an exon skipping strategy partially prevented the reductions in both force drop and muscle excitability following lengthening contractions. Conclusion We demonstrated for the first time that (i) the increased susceptibility to contraction-induced muscle injury in mdx mice is mainly attributable to reduced muscle excitability; (ii) dystrophin-based therapy improves fragility of the dystrophic skeletal muscle by preventing reduction in muscle excitability.
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Affiliation(s)
- Pauline Roy
- Groupe Hospitalier Pitié Salpêtrière, Centre de Recherche en Myologie, CNRS, Inserm, UPMC Univ Paris 06, Sorbonne Universités, Paris, F-75013 France
| | - Fredérique Rau
- Groupe Hospitalier Pitié Salpêtrière, Centre de Recherche en Myologie, CNRS, Inserm, UPMC Univ Paris 06, Sorbonne Universités, Paris, F-75013 France
| | - Julien Ochala
- Centre of Human and Aerospace Physiological Sciences, King's College London, Guy's Campus, SE3 8TL London, UK
| | - Julien Messéant
- Groupe Hospitalier Pitié Salpêtrière, Centre de Recherche en Myologie, CNRS, Inserm, UPMC Univ Paris 06, Sorbonne Universités, Paris, F-75013 France
| | - Bodvael Fraysse
- Groupe Hospitalier Pitié Salpêtrière, Centre de Recherche en Myologie, CNRS, Inserm, UPMC Univ Paris 06, Sorbonne Universités, Paris, F-75013 France
| | - Jeanne Lainé
- Groupe Hospitalier Pitié Salpêtrière, Centre de Recherche en Myologie, CNRS, Inserm, UPMC Univ Paris 06, Sorbonne Universités, Paris, F-75013 France
| | - Onnik Agbulut
- Biological Adaptation and Ageing, UMR CNRS 8256, Institut de Biologie Paris-Seine (IBPS), UPMC Univ Paris 06, Sorbonne Universités, Paris, F-75005 France
| | - Gillian Butler-Browne
- Groupe Hospitalier Pitié Salpêtrière, Centre de Recherche en Myologie, CNRS, Inserm, UPMC Univ Paris 06, Sorbonne Universités, Paris, F-75013 France
| | - Denis Furling
- Groupe Hospitalier Pitié Salpêtrière, Centre de Recherche en Myologie, CNRS, Inserm, UPMC Univ Paris 06, Sorbonne Universités, Paris, F-75013 France
| | - Arnaud Ferry
- Groupe Hospitalier Pitié Salpêtrière, Centre de Recherche en Myologie, CNRS, Inserm, UPMC Univ Paris 06, Sorbonne Universités, Paris, F-75013 France ; Sorbonne Paris Cité, Université Paris Descartes, Paris, F-75006 France ; Groupe Hospitalier Pitié-Salpétrière, Institut de Myologie, F-75013 Paris, France
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23
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Recher G, Coumailleau P, Rouède D, Tiaho F. Structural origin of the drastic modification of second harmonic generation intensity pattern occurring in tail muscles of climax stages xenopus tadpoles. J Struct Biol 2015; 190:1-10. [PMID: 25770062 DOI: 10.1016/j.jsb.2015.03.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2014] [Revised: 02/08/2015] [Accepted: 03/04/2015] [Indexed: 01/27/2023]
Abstract
Second harmonic generation (SHG) microscopy is a powerful tool for studying submicron architecture of muscles tissues. Using this technique, we show that the canonical single frequency sarcomeric SHG intensity pattern (SHG-IP) of premetamorphic xenopus tadpole tail muscles is converted to double frequency (2f) sarcomeric SHG-IP in metamorphic climax stages due to massive physiological muscle proteolysis. This conversion was found to rise from 7% in premetamorphic muscles to about 97% in fragmented muscular apoptotic bodies. Moreover a 66% conversion was also found in non-fragmented metamorphic tail muscles. Also, a strong correlation between predominant 2f sarcomeric SHG-IPs and myofibrillar misalignment is established with electron microscopy. Experimental and theoretical results demonstrate the higher sensitivity and the supra resolution power of SHG microscopy over TPEF to reveal 3D myofibrillar misalignment. From this study, we suggest that 2f sarcomeric SHG-IP could be used as signature of triad defect and disruption of excitation-contraction coupling. As the mechanism of muscle proteolysis is similar to that found in mdx mouse muscles, we further suggest that xenopus tadpole tail resorption at climax stages could be used as an alternative or complementary model of Duchene muscular dystrophy.
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Affiliation(s)
- Gaëlle Recher
- UMR CNRS 6026, Université de Rennes1, Campus de Beaulieu, Rennes F-35000, France; Department of Physiology, Development and Neuroscience, University of Cambridge, Downing Street, Cambridge CB2 3DY, UK
| | - Pascal Coumailleau
- UMR CNRS 6026, Université de Rennes1, Campus de Beaulieu, Rennes F-35000, France; IRSET, INSERM, U1085, Université de Rennes1, Campus de Beaulieu, Rennes F-35000, France
| | - Denis Rouède
- IPR, CNRS, UMR-CNRS UR1-6251, Université de Rennes1, Campus de Beaulieu, Rennes F-35000, France
| | - François Tiaho
- UMR CNRS 6026, Université de Rennes1, Campus de Beaulieu, Rennes F-35000, France; IRSET, INSERM, U1085, Université de Rennes1, Campus de Beaulieu, Rennes F-35000, France.
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24
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Blaauw B, Schiaffino S, Reggiani C. Mechanisms modulating skeletal muscle phenotype. Compr Physiol 2014; 3:1645-87. [PMID: 24265241 DOI: 10.1002/cphy.c130009] [Citation(s) in RCA: 155] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Mammalian skeletal muscles are composed of a variety of highly specialized fibers whose selective recruitment allows muscles to fulfill their diverse functional tasks. In addition, skeletal muscle fibers can change their structural and functional properties to perform new tasks or respond to new conditions. The adaptive changes of muscle fibers can occur in response to variations in the pattern of neural stimulation, loading conditions, availability of substrates, and hormonal signals. The new conditions can be detected by multiple sensors, from membrane receptors for hormones and cytokines, to metabolic sensors, which detect high-energy phosphate concentration, oxygen and oxygen free radicals, to calcium binding proteins, which sense variations in intracellular calcium induced by nerve activity, to load sensors located in the sarcomeric and sarcolemmal cytoskeleton. These sensors trigger cascades of signaling pathways which may ultimately lead to changes in fiber size and fiber type. Changes in fiber size reflect an imbalance in protein turnover with either protein accumulation, leading to muscle hypertrophy, or protein loss, with consequent muscle atrophy. Changes in fiber type reflect a reprogramming of gene transcription leading to a remodeling of fiber contractile properties (slow-fast transitions) or metabolic profile (glycolytic-oxidative transitions). While myonuclei are in postmitotic state, satellite cells represent a reserve of new nuclei and can be involved in the adaptive response.
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Affiliation(s)
- Bert Blaauw
- Department of Biomedical Sciences, University of Padova, Padova, Italy
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25
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Rouède D, Coumailleau P, Schaub E, Bellanger JJ, Blanchard-Desce M, Tiaho F. Myofibrillar misalignment correlated to triad disappearance of mdx mouse gastrocnemius muscle probed by SHG microscopy. BIOMEDICAL OPTICS EXPRESS 2014; 5:858-875. [PMID: 24688819 PMCID: PMC3959848 DOI: 10.1364/boe.5.000858] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2013] [Revised: 01/15/2014] [Accepted: 01/19/2014] [Indexed: 06/03/2023]
Abstract
We show that the canonical single frequency sarcomeric SHG intensity pattern (SHG-IP) of control muscles is converted to double frequency sarcomeric SHG-IP in preserved mdx mouse gastrocnemius muscles in the vicinity of necrotic fibers. These double frequency sarcomeric SHG-IPs are often spatially correlated to double frequency sarcomeric two-photon excitation fluorescence (TPEF) emitted from Z-line and I-bands and to one centered spot SHG angular intensity pattern (SHG-AIP) suggesting that these patterns are signature of myofibrillar misalignement. This latter is confirmed with transmission electron microscopy (TEM). Moreover, a good spatial correlation between SHG signature of myofibrillar misalignment and triad reduction is established. Theoretical simulation of sarcomeric SHG-IP is used to demonstrate the correlation between change of SHG-IP and -AIP and myofibrillar misalignment. The extreme sensitivity of SHG microscopy to reveal the submicrometric organization of A-band thick filaments is highlighted. This report is a first step toward future studies aimed at establishing live SHG signature of myofibrillar misalignment involving excitation contraction defects due to muscle damage and disease.
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Affiliation(s)
- Denis Rouède
- IPR, CNRS, UMR-CNRS UR1- 6251, Université de Rennes1, Campus de Beaulieu, Rennes, F-35000, France
| | - Pascal Coumailleau
- IRSET, INSERM, U1085, Université de Rennes1, Campus de Beaulieu, Rennes, F-35000, France
| | - Emmanuel Schaub
- IPR, CNRS, UMR-CNRS UR1- 6251, Université de Rennes1, Campus de Beaulieu, Rennes, F-35000, France
| | | | | | - François Tiaho
- IRSET, INSERM, U1085, Université de Rennes1, Campus de Beaulieu, Rennes, F-35000, France
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26
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Zou Y, Zwolanek D, Izu Y, Gandhy S, Schreiber G, Brockmann K, Devoto M, Tian Z, Hu Y, Veit G, Meier M, Stetefeld J, Hicks D, Straub V, Voermans NC, Birk DE, Barton ER, Koch M, Bönnemann CG. Recessive and dominant mutations in COL12A1 cause a novel EDS/myopathy overlap syndrome in humans and mice. Hum Mol Genet 2013; 23:2339-52. [PMID: 24334604 DOI: 10.1093/hmg/ddt627] [Citation(s) in RCA: 82] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Collagen VI-related myopathies are disorders of connective tissue presenting with an overlap phenotype combining clinical involvement from the muscle and from the connective tissue. Not all patients displaying related overlap phenotypes between muscle and connective tissue have mutations in collagen VI. Here, we report a homozygous recessive loss of function mutation and a de novo dominant mutation in collagen XII (COL12A1) as underlying a novel overlap syndrome involving muscle and connective tissue. Two siblings homozygous for a loss of function mutation showed widespread joint hyperlaxity combined with weakness precluding independent ambulation, while the patient with the de novo missense mutation was more mildly affected, showing improvement including the acquisition of walking. A mouse model with inactivation of the Col12a1 gene showed decreased grip strength, a delay in fiber-type transition and a deficiency in passive force generation while the muscle seems more resistant to eccentric contraction induced force drop, indicating a role for a matrix-based passive force-transducing elastic element in the generation of the weakness. This new muscle connective tissue overlap syndrome expands on the emerging importance of the muscle extracellular matrix in the pathogenesis of muscle disease.
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Affiliation(s)
- Yaqun Zou
- Neuromuscular and Neurogenetic Disorders of Childhood Section, National Institute of Neurological Disorders and Stroke, NIH, Bethesda, MD, USA
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27
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Hyldahl RD, Hubal MJ. Lengthening our perspective: Morphological, cellular, and molecular responses to eccentric exercise. Muscle Nerve 2013; 49:155-70. [DOI: 10.1002/mus.24077] [Citation(s) in RCA: 180] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2013] [Revised: 08/23/2013] [Accepted: 08/26/2013] [Indexed: 12/25/2022]
Affiliation(s)
- Robert D. Hyldahl
- Department of Exercise Science; 106 Smith Fieldhouse; Brigham Young University; Provo Utah 84003 USA
| | - Monica J. Hubal
- Research Center for Genetic Medicine; Children's National Medical Center; Washington DC USA
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28
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Dorchies OM, Reutenauer-Patte J, Dahmane E, Ismail HM, Petermann O, Patthey- Vuadens O, Comyn SA, Gayi E, Piacenza T, Handa RJ, Décosterd LA, Ruegg UT. The anticancer drug tamoxifen counteracts the pathology in a mouse model of duchenne muscular dystrophy. THE AMERICAN JOURNAL OF PATHOLOGY 2013; 182:485-504. [PMID: 23332367 DOI: 10.1016/j.ajpath.2012.10.018] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2012] [Revised: 09/17/2012] [Accepted: 10/07/2012] [Indexed: 12/18/2022]
Abstract
Duchenne muscular dystrophy (DMD) is a severe disorder characterized by progressive muscle wasting,respiratory and cardiac impairments, and premature death. No treatment exists so far, and the identification of active substances to fight DMD is urgently needed. We found that tamoxifen, a drug used to treat estrogen-dependent breast cancer, caused remarkable improvements of muscle force and of diaphragm and cardiac structure in the mdx(5Cv) mouse model of DMD. Oral tamoxifen treatment from 3 weeks of age for 15 months at a dose of 10 mg/kg/day stabilized myofiber membranes, normalized whole body force, and increased force production and resistance to repeated contractions of the triceps muscle above normal values. Tamoxifen improved the structure of leg muscles and diminished cardiac fibrosis by~ 50%. Tamoxifen also reduced fibrosis in the diaphragm, while increasing its thickness,myofiber count, and myofiber diameter, thereby augmenting by 72% the amount of contractile tissue available for respiratory function. Tamoxifen conferred a markedly slower phenotype to the muscles.Tamoxifen and its metabolites were present in nanomolar concentrations in plasma and muscles,suggesting signaling through high-affinity targets. Interestingly, the estrogen receptors ERa and ERb were several times more abundant in dystrophic than in normal muscles, and tamoxifen normalized the relative abundance of ERb isoforms. Our findings suggest that tamoxifen might be a useful therapy for DMD.
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MESH Headings
- Animals
- Antineoplastic Agents/pharmacology
- Antineoplastic Agents/therapeutic use
- Behavior, Animal/drug effects
- Biomarkers/metabolism
- Biomechanical Phenomena/drug effects
- Body Weight/drug effects
- Creatine Kinase/blood
- Diaphragm/pathology
- Diaphragm/physiopathology
- Disease Models, Animal
- Feeding Behavior/drug effects
- Fibrosis
- Mice
- Muscle Contraction/drug effects
- Muscle Fibers, Skeletal/drug effects
- Muscle Fibers, Skeletal/pathology
- Muscular Dystrophy, Animal/blood
- Muscular Dystrophy, Animal/drug therapy
- Muscular Dystrophy, Animal/pathology
- Muscular Dystrophy, Animal/physiopathology
- Muscular Dystrophy, Duchenne/blood
- Muscular Dystrophy, Duchenne/drug therapy
- Muscular Dystrophy, Duchenne/pathology
- Muscular Dystrophy, Duchenne/physiopathology
- Myocardium/pathology
- Organ Size/drug effects
- Receptors, Estrogen/metabolism
- Tamoxifen/blood
- Tamoxifen/pharmacology
- Tamoxifen/therapeutic use
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Affiliation(s)
- Olivier M Dorchies
- Department of Pharmacology, University of Geneva and University of Lausanne, Geneva, Switzerland.
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29
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Call JA, Warren GL, Verma M, Lowe DA. Acute failure of action potential conduction in mdx muscle reveals new mechanism of contraction-induced force loss. J Physiol 2013; 591:3765-76. [PMID: 23753524 DOI: 10.1113/jphysiol.2013.254656] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
A primary feature of skeletal muscle lacking the protein dystrophin, as occurring in Duchenne muscular dystrophy, is a hypersensitivity to contraction-induced strength loss. We tested the hypothesis that the extensive strength loss results from an impairment in the electrophysiological function of the plasmalemma specifically impaired action potential development. Anterior crural muscles from mdx and wildtype mice performed a single bout of 100 electrically stimulated eccentric contractions in vivo. Electromyography, specifically the M-wave, was analysed during muscle contraction to assess the ability of the tibialis anterior muscle plasmalemma to generate and conduct action potentials. During eccentric contractions, wildtype mice exhibited a 36% loss in torque about the ankle but mdx mice exhibited a greater torque loss of 73% (P < 0.001). Despite the loss of torque, there was no reduction in M-wave root mean square (RMS) for wildtype mice, which was in stark contrast to mdx mice that had a 55% reduction in M-wave RMS (P < 0.001). This impairment resolved within 24 h and coincided with a significant improvement in strength and membrane integrity. Intracellular measurements of resting membrane potential (RMP) in uninjured and injured extensor digitorum longus muscles were made to determine if a chronic depolarization had occurred, which could lead to impaired fibre excitability and/or altered action potential conduction properties. The distributions of RMP were not different between wildtype uninjured and injured muscle cells (median: -73.2 mV vs. -72.7 mV, P = 0.46) whereas there was a significant difference between mdx uninjured and injured cells (median: -71.5 mV vs. -56.6 mV, P < 0.001). These data show that mdx muscle fibres are depolarized after an injurious bout of eccentric contractions. These findings (i) suggest a major plasmalemma-based mechanism of strength loss underlying contraction-induced injury in Duchenne muscular dystrophy distinctly different from that for healthy muscle, and (ii) demonstrate dystrophin is critical for maintaining action potential generation and conduction after eccentric contractions.
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Affiliation(s)
- Jarrod A Call
- Programs in Rehabilitation Science and Physical Therapy, School of Medicine, University of Minnesota, Minneapolis, MN, USA.
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30
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Hourdé C, Joanne P, Noirez P, Agbulut O, Butler-Browne G, Ferry A. Protective effect of female gender-related factors on muscle force-generating capacity and fragility in the dystrophic mdx mouse. Muscle Nerve 2013; 48:68-75. [PMID: 23625771 DOI: 10.1002/mus.23700] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/07/2012] [Indexed: 12/21/2022]
Abstract
INTRODUCTION The dystrophic features in hindlimb skeletal muscles of female mdx mice are unclear. METHODS We analyzed force-generating capacity and force decline after lengthening contraction-induced damage (fragility). RESULTS Young (6-month-old) female mdx mice displayed reduced force-generating capacity (-18%) and higher fragility (23% force decline) compared with female age-matched wild-type mice. These 2 dystrophic features were less accentuated in young female than in young male mdx mice (-32% and 42% force drop). With advancing age, force-generating capacity decreased and fragility increased in old (20 month) female mdx mice (-21% and 57% force decline), but they were unchanged in old male mdx mice. Moreover, estradiol treatment had no effect in old female mdx mice. CONCLUSIONS Female gender-related factors mitigate dystrophic features in young but not old mdx mice. Further studies are warranted to identify the beneficial gender-related factor in dystrophic muscle.
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Affiliation(s)
- Christophe Hourdé
- Université Pierre et Marie Curie-Paris 6, UMR S794, INSERM, U974, CNRS UMR7215, Institut de Myologie, GH Pitié-Salpètrière, 47, Boulevard de l'HÔpital, Bâtiment Babinski, Paris, F-75013 France
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31
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Hoogaars WMH, Mouisel E, Pasternack A, Hulmi JJ, Relizani K, Schuelke M, Schirwis E, Garcia L, Ritvos O, Ferry A, 't Hoen PA, Amthor H. Combined effect of AAV-U7-induced dystrophin exon skipping and soluble activin Type IIB receptor in mdx mice. Hum Gene Ther 2012; 23:1269-79. [PMID: 22894762 DOI: 10.1089/hum.2012.056] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Adeno-associated virus (AAV)-U7-mediated skipping of dystrophin-exon-23 restores dystrophin expression and muscle function in the mdx mouse model of Duchenne muscular dystrophy. Soluble activin receptor IIB (sActRIIB-Fc) inhibits signaling of myostatin and homologous molecules and increases muscle mass and function of wild-type and mdx mice. We hypothesized that combined treatment with AAV-U7 and sActRIIB-Fc may synergistically improve mdx muscle function. Bioactivity of sActRIIB-Fc on skeletal muscle was first demonstrated in wild-type mice. In mdx mice we show that AAV-U7-mediated dystrophin restoration improved specific muscle force and resistance to eccentric contractions when applied alone. Treatment of mdx mice with sActRIIB-Fc increased body weight, muscle mass and myofiber size, but had little effect on muscle function. Combined treatment stimulated muscle growth comparable to the effect of sActRIIB-Fc alone and dystrophin rescue was similar to AAV-U7 alone. Moreover, combined treatment improved maximal tetanic force and the resistance to eccentric contraction to similar extent as AAV-U7 alone. In conclusion, combination of dystrophin exon skipping with sActRIIB-Fc brings together benefits of each treatment; however, we failed to evidence a clear synergistic effect on mdx muscle function.
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Affiliation(s)
- Willem M H Hoogaars
- Leiden University Medical Center (LUMC), Department of Human Genetics, 2333 ZC Leiden, The Netherlands
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32
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Barnabei MS, Metzger JM. Ex vivo stretch reveals altered mechanical properties of isolated dystrophin-deficient hearts. PLoS One 2012; 7:e32880. [PMID: 22427904 PMCID: PMC3298453 DOI: 10.1371/journal.pone.0032880] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2011] [Accepted: 02/06/2012] [Indexed: 12/12/2022] Open
Abstract
Duchenne muscular dystrophy (DMD) is a progressive and fatal disease of muscle wasting caused by loss of the cytoskeletal protein dystrophin. In the heart, DMD results in progressive cardiomyopathy and dilation of the left ventricle through mechanisms that are not fully understood. Previous reports have shown that loss of dystrophin causes sarcolemmal instability and reduced mechanical compliance of isolated cardiac myocytes. To expand upon these findings, here we have subjected the left ventricles of dystrophin-deficient mdx hearts to mechanical stretch. Unexpectedly, isolated mdx hearts showed increased left ventricular (LV) compliance compared to controls during stretch as LV volume was increased above normal end diastolic volume. During LV chamber distention, sarcomere lengths increased similarly in mdx and WT hearts despite greater excursions in volume of mdx hearts. This suggests that the mechanical properties of the intact heart cannot be modeled as a simple extrapolation of findings in single cardiac myocytes. To explain these findings, a model is proposed in which disruption of the dystrophin-glycoprotein complex perturbs cell-extracellular matrix contacts and promotes the apparent slippage of myocytes past each other during LV distension. In comparison, similar increases in LV compliance were obtained in isolated hearts from β-sarcoglycan-null and laminin-α2 mutant mice, but not in dysferlin-null mice, suggesting that increased whole-organ compliance in mdx mice is a specific effect of disrupted cell-extracellular matrix contacts and not a general consequence of cardiomyopathy via membrane defect processes. Collectively, these findings suggest a novel and cell-death independent mechanism for the progressive pathological LV dilation that occurs in DMD.
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Affiliation(s)
| | - Joseph M. Metzger
- Department of Integrative Biology and Physiology, University of Minnesota Medical School, Minneapolis, Minnesota, United States of America
- * E-mail:
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ColVI myopathies: where do we stand, where do we go? Skelet Muscle 2011; 1:30. [PMID: 21943391 PMCID: PMC3189202 DOI: 10.1186/2044-5040-1-30] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2011] [Accepted: 09/23/2011] [Indexed: 02/08/2023] Open
Abstract
Collagen VI myopathies, caused by mutations in the genes encoding collagen type VI (ColVI), represent a clinical continuum with Ullrich congenital muscular dystrophy (UCMD) and Bethlem myopathy (BM) at each end of the spectrum, and less well-defined intermediate phenotypes in between. ColVI myopathies also share common features with other disorders associated with prominent muscle contractures, making differential diagnosis difficult. This group of disorders, under-recognized for a long time, has aroused much interest over the past decade, with important advances made in understanding its molecular pathogenesis. Indeed, numerous mutations have now been reported in the COL6A1, COL6A2 and COL6A3 genes, a large proportion of which are de novo and exert dominant-negative effects. Genotype-phenotype correlations have also started to emerge, which reflect the various pathogenic mechanisms at play in these disorders: dominant de novo exon splicing that enables the synthesis and secretion of mutant tetramers and homozygous nonsense mutations that lead to premature termination of translation and complete loss of function are associated with early-onset, severe phenotypes. In this review, we present the current state of diagnosis and research in the field of ColVI myopathies. The past decade has provided significant advances, with the identification of altered cellular functions in animal models of ColVI myopathies and in patient samples. In particular, mitochondrial dysfunction and a defect in the autophagic clearance system of skeletal muscle have recently been reported, thereby opening potential therapeutic avenues.
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Biomechanics of the sarcolemma and costameres in single skeletal muscle fibers from normal and dystrophin-null mice. J Muscle Res Cell Motil 2011; 31:323-36. [PMID: 21312057 DOI: 10.1007/s10974-011-9238-9] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2010] [Accepted: 01/11/2011] [Indexed: 01/01/2023]
Abstract
We studied the biomechanical properties of the sarcolemma and its links through costameres to the contractile apparatus in single mammalian myofibers of Extensor digitorum longus muscles isolated from wild (WT) and dystrophin-null (mdx) mice. Suction pressures (P) applied through a pipette to the sarcolemma generated a bleb, the height of which increased with increasing P. Larger increases in P broke the connections between the sarcolemma and myofibrils and eventually caused the sarcolemma to burst. We used the values of P at which these changes occurred to estimate the tensions and stiffness of the system and its individual elements. Tensions of the whole system and the sarcolemma, as well as the maximal tension sustained by the costameres, were all significantly lower (1.8-3.3 fold) in muscles of mdx mice compared to WT. Values of P at which separation and bursting occurred, as well as the stiffness of the whole system and of the isolated sarcolemma, were ~2-fold lower in mdx than in WT. Our results indicate that the absence of dystrophin reduces muscle stiffness, increases sarcolemmal deformability, and compromises the mechanical stability of costameres and their connections to nearby myofibrils.
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Menazza S, Blaauw B, Tiepolo T, Toniolo L, Braghetta P, Spolaore B, Reggiani C, Di Lisa F, Bonaldo P, Canton M. Oxidative stress by monoamine oxidases is causally involved in myofiber damage in muscular dystrophy. Hum Mol Genet 2010; 19:4207-15. [PMID: 20716577 DOI: 10.1093/hmg/ddq339] [Citation(s) in RCA: 94] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Several studies documented the key role of oxidative stress and abnormal production of reactive oxygen species (ROS) in the pathophysiology of muscular dystrophies (MDs). The sources of ROS, however, are still controversial as well as their major molecular targets. This study investigated whether ROS produced in mitochondria by monoamine oxidase (MAO) contributes to MD pathogenesis. Pargyline, an MAO inhibitor, reduced ROS accumulation along with a beneficial effect on the dystrophic phenotype of Col6a1(-/-) mice, a model of Bethlem myopathy and Ullrich congenital MD, and mdx mice, a model of Duchenne MD. Based on our previous observations on oxidative damage of myofibrillar proteins in heart failure, we hypothesized that MAO-dependent ROS might impair contractile function in dystrophic muscles. Indeed, oxidation of myofibrillar proteins, as probed by formation of disulphide cross-bridges in tropomyosin, was detected in both Col6a1(-/-) and mdx muscles. Notably, pargyline significantly reduced myofiber apoptosis and ameliorated muscle strength in Col6a1(-/-) mice. This study demonstrates a novel and determinant role of MAO in MDs, adding evidence of the pivotal role of mitochondria and suggesting a therapeutic potential for MAO inhibition.
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Affiliation(s)
- Sara Menazza
- Department of Biomedical Sciences, University of Padova, 35131 Padova, Italy
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Wang R, Urso ML, Zambraski EJ, Rader EP, Campbell KP, Liang BT. Adenosine A(3) receptor stimulation induces protection of skeletal muscle from eccentric exercise-mediated injury. Am J Physiol Regul Integr Comp Physiol 2010; 299:R259-67. [PMID: 20427727 DOI: 10.1152/ajpregu.00060.2010] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Effective therapy to reduce skeletal muscle injury associated with severe or eccentric exercise is needed. The purpose of this study was to determine whether adenosine receptor stimulation can mediate protection from eccentric exercise-induced muscle injury. Downhill treadmill exercise (-15 degrees ) was used to induce eccentric exercise-mediated skeletal muscle injury. Experiments were conducted in both normal wild-type (WT) mice and also in beta-sarcoglycan knockout dystrophic mice, animals that show an exaggerated muscle damage with the stress of exercise. In the vehicle-treated WT animals, eccentric exercise increased serum creatine kinase (CK) greater than 3-fold to 358.9 +/- 62.7 U/l (SE). This increase was totally abolished by stimulation of the A(3) receptor. In the dystrophic beta-sarcoglycan-null mice, eccentric exercise caused CK levels to reach 55,124 +/- 5,558 U/l. A(3) receptor stimulation in these animals reduced the CK response by nearly 50%. In the dystrophic mice at rest, 10% of the fibers were found to be damaged, as indicated by Evans blue dye staining. While this percentage was doubled after exercise, A(3) receptor stimulation eliminated this increase. Neither the A(1) receptor agonist 2-chloro-N(6)-cyclopentyladenosine (0.05 mg/kg) nor the A(2A) receptor agonist 2-p-(2-carboxyethyl)phenethylamino-5'-N-ethylcarboxamidoadenosine (0.07 mg/kg) protected skeletal muscle from eccentric exercise injury in WT or dystrophic mice. The protective effect of adenosine A(3) receptor stimulation was absent in mice, in which genes for phospholipase C beta2/beta3 (PLCbeta2/beta3) and beta-sarcoglycan were deleted. The present study elucidates a new protective role of the A(3) receptor and PLCbeta2/beta3 and points to a potentially effective therapeutic strategy for eccentric exercise-induced skeletal muscle injury.
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Affiliation(s)
- Ruibo Wang
- Pat and Jim Calhoun Cardiology Center, University of Connecticut Health Center, Farmington, Connecticut 06030, USA
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Head SI. Branched fibres in old dystrophicmdxmuscle are associated with mechanical weakening of the sarcolemma, abnormal Ca2+transients and a breakdown of Ca2+homeostasis during fatigue. Exp Physiol 2010; 95:641-56. [DOI: 10.1113/expphysiol.2009.052019] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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