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Moutachi D, Hyzewicz J, Roy P, Lemaitre M, Bachasson D, Amthor H, Ritvos O, Li Z, Furling D, Agbulut O, Ferry A. Treadmill running and mechanical overloading improved the strength of the plantaris muscle in the dystrophin-desmin double knockout (DKO) mouse. J Physiol 2024; 602:3641-3660. [PMID: 38980963 DOI: 10.1113/jp286425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2024] [Accepted: 06/24/2024] [Indexed: 07/11/2024] Open
Abstract
Limited knowledge exists regarding the chronic effect of muscular exercise on muscle function in a murine model of severe Duchenne muscular dystrophy (DMD). Here we determined the effects of 1 month of voluntary wheel running (WR), 1 month of enforced treadmill running (TR) and 1 month of mechanical overloading resulting from the removal of the synergic muscles (OVL) in mice lacking both dystrophin and desmin (DKO). Additionally, we examined the effect of activin receptor administration (AR). DKO mice, displaying severe muscle weakness, atrophy and greater susceptibility to contraction-induced functional loss, were exercised or treated with AR at 1 month of age and in situ force production of lower leg muscle was measured at the age of 2 months. We found that TR and OVL increased absolute maximal force and the rate of force development of the plantaris muscle in DKO mice. In contrast, those of the tibialis anterior (TA) muscle remained unaffected by TR and WR. Furthermore, the effects of TR and OVL on plantaris muscle function in DKO mice closely resembled those in mdx mice, a less severe murine DMD model. AR also improved absolute maximal force and the rate of force development of the TA muscle in DKO mice. In conclusion, exercise training improved plantaris muscle weakness in severely affected dystrophic mice. Consequently, these preclinical results may contribute to fostering further investigations aimed at assessing the potential benefits of exercise for DMD patients, particularly resistance training involving a low number of intense muscle contractions. KEY POINTS: Very little is known about the effects of exercise training in a murine model of severe Duchenne muscular dystrophy (DMD). One reason is that it is feared that chronic muscular exercise, particularly that involving intense muscle contractions, could exacerbate the disease. In DKO mice lacking both dystrophin and desmin, characterized by severe lower leg muscle weakness, atrophy and fragility in comparison to the less severe DMD mdx model, we found that enforced treadmill running improved absolute maximal force of the plantaris muscle, while that of tibialis anterior muscle remained unaffected by both enforced treadmill and voluntary wheel running. Furthermore, mechanical overloading, a non-physiological model of chronic resistance exercise, reversed plantaris muscle weakness. Consequently, our findings may have the potential to alleviate concerns and pave the way for exploring the prescription of endurance and resistance training as a viable therapeutic approach for the treatment of dystrophic patients. Additionally, such interventions may serve in mitigating the pathophysiological mechanisms induced by physical inactivity.
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Affiliation(s)
- Dylan Moutachi
- Sorbonne Université, INSERM U974, Centre de Recherche en Myologie, Paris, France
| | - Janek Hyzewicz
- Integrare Research Unit UMRS951, Université Paris-Saclay, Univ Evry, Inserm, Genethon, Evry, France
| | - Pauline Roy
- Sorbonne Université, INSERM U974, Centre de Recherche en Myologie, Paris, France
| | - Mégane Lemaitre
- Sorbonne Université, INSERM U974, Centre de Recherche en Myologie, Paris, France
| | - Damien Bachasson
- Institute of Myology, Neuromuscular Investigation Center, Neuromuscular Physiology and Evaluation Laboratory, Paris, France
| | - Helge Amthor
- Université de Versailles Saint-Quentin-en-Yvelines, INSERM U1179, Montigny-le-Bretonneux, France
| | - Olli Ritvos
- Department of Physiology, Faculty of Medicine, University of Helsinki, Helsinki, Finland
| | - Zhenlin Li
- Sorbonne Université, Institut de Biologie Paris-Seine, UMR CNRS 8256, Inserm ERL U1164, Biological Adaptation and Ageing, Paris, France
| | - Denis Furling
- Sorbonne Université, INSERM U974, Centre de Recherche en Myologie, Paris, France
| | - Onnik Agbulut
- Sorbonne Université, Institut de Biologie Paris-Seine, UMR CNRS 8256, Inserm ERL U1164, Biological Adaptation and Ageing, Paris, France
| | - Arnaud Ferry
- Sorbonne Université, INSERM U974, Centre de Recherche en Myologie, Paris, France
- Université Paris Cité, Paris, France
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Hassani M, Moutachi D, Lemaitre M, Boulinguiez A, Furling D, Agbulut O, Ferry A. Beneficial effects of resistance training on both mild and severe mouse dystrophic muscle function as a preclinical option for Duchenne muscular dystrophy. PLoS One 2024; 19:e0295700. [PMID: 38457407 PMCID: PMC10923407 DOI: 10.1371/journal.pone.0295700] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2023] [Accepted: 11/27/2023] [Indexed: 03/10/2024] Open
Abstract
Mechanical overloading (OVL) resulting from the ablation of muscle agonists, a supra-physiological model of resistance training, reduces skeletal muscle fragility, i.e. the immediate maximal force drop following lengthening contractions, and increases maximal force production, in mdx mice, a murine model of Duchene muscular dystrophy (DMD). Here, we further analyzed these beneficial effects of OVL by determining whether they were blocked by cyclosporin, an inhibitor of the calcineurin pathway, and whether there were also observed in the D2-mdx mice, a more severe murine DMD model. We found that cyclosporin did not block the beneficial effect of 1-month OVL on plantaris muscle fragility in mdx mice, nor did it limit the increases in maximal force and muscle weight (an index of hypertrophy). Fragility and maximal force were also ameliorated by OVL in the plantaris muscle of D2-mdx mice. In addition, OVL increased the expression of utrophin, cytoplamic γ-actin, MyoD, and p-Akt in the D2-mdx mice, proteins playing an important role in fragility, maximal force gain and muscle growth. In conclusion, OVL reduced fragility and increased maximal force in the more frequently used mild mdx model but also in D2-mdx mice, a severe model of DMD, closer to human physiopathology. Moreover, these beneficial effects of OVL did not seem to be related to the activation of the calcineurin pathway. Thus, this preclinical study suggests that resistance training could have a potential benefit in the improvement of the quality of life of DMD patients.
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Affiliation(s)
- Medhi Hassani
- Sorbonne Université, Institut de Biologie Paris-Seine, UMR CNRS 8256, INSERM ERL U1164, Biological Adaptation and Ageing, Paris, F-75013 France
| | - Dylan Moutachi
- Sorbonne Université, INSERM, Institut de Myologie, Centre de Recherche en Myologie, F-75013 Paris, France
| | | | - Alexis Boulinguiez
- Department of Biological Sciences, Royal Holloway University of London, Surrey, United Kingdom
| | - Denis Furling
- Sorbonne Université, INSERM, Institut de Myologie, Centre de Recherche en Myologie, F-75013 Paris, France
| | - Onnik Agbulut
- Sorbonne Université, Institut de Biologie Paris-Seine, UMR CNRS 8256, INSERM ERL U1164, Biological Adaptation and Ageing, Paris, F-75013 France
| | - Arnaud Ferry
- Sorbonne Université, INSERM, Institut de Myologie, Centre de Recherche en Myologie, F-75013 Paris, France
- Université Paris Cité, F-75006 Paris, France
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3
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Monceau A, Moutachi D, Lemaitre M, Garcia L, Trollet C, Furling D, Klein A, Ferry A. Dystrophin Restoration after Adeno-Associated Virus U7-Mediated Dmd Exon Skipping Is Modulated by Muscular Exercise in the Severe D2-Mdx Duchenne Muscular Dystrophy Murine Model. THE AMERICAN JOURNAL OF PATHOLOGY 2022; 192:1604-1618. [PMID: 36113555 DOI: 10.1016/j.ajpath.2022.07.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Revised: 07/18/2022] [Accepted: 07/29/2022] [Indexed: 06/15/2023]
Abstract
Duchenne muscular dystrophy (DMD) is a severe neuromuscular disease caused by Dmd mutations, resulting in the absence of dystrophin in skeletal muscle, and a greater susceptibility to damage during contraction (exercise). The current study evaluated whether voluntary exercise impacts a Dmd exon skipping and muscle physiology in a severe DMD murine model. D2-mdx mice were intramuscularly injected with an adeno-associated virus (AAV) U7 snRNA to correct Dmd reading frame, and allowed to voluntary run on a wheel for 1 month. Voluntary running did not induce muscle fiber regeneration, as indicated by the percentage of centronucleated fibers, Myh3 and Myh4 expression, and maximal force production, and thus possibly did not compromise the gene therapy approach. Voluntary running did not impact the number of viral genomes and the expression of U7 and Dmd 1 month after injection of AAV-U7 injected just before exercise initiation, but reduced the amount of dystrophin in dystrophin-expressing fibers from 80% to 65% of the muscle cross-sectional area. In conclusion, voluntary running did not induce muscle damage and had no drastic detrimental effect on the AAV gene therapy exon skipping approach in a severe murine DMD model. Moreover, these results suggest considering exercise as an additional element in the design and conception of future therapeutic approaches for DMD.
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Affiliation(s)
- Alexandra Monceau
- UMRS974 INSERM, Association of Myology Institute, Myology Center of Research, UMRS974, Sorbonne Université, Paris, France
| | - Dylan Moutachi
- UMRS974 INSERM, Association of Myology Institute, Myology Center of Research, UMRS974, Sorbonne Université, Paris, France
| | | | - Luis Garcia
- U1179 INSERM, Université de Versailles Saint-Quentin-en-Yvelines, Montigny le Bretonneux, Paris, France
| | - Capucine Trollet
- UMRS974 INSERM, Association of Myology Institute, Myology Center of Research, UMRS974, Sorbonne Université, Paris, France
| | - Denis Furling
- UMRS974 INSERM, Association of Myology Institute, Myology Center of Research, UMRS974, Sorbonne Université, Paris, France
| | - Arnaud Klein
- UMRS974 INSERM, Association of Myology Institute, Myology Center of Research, UMRS974, Sorbonne Université, Paris, France
| | - Arnaud Ferry
- UMRS974 INSERM, Association of Myology Institute, Myology Center of Research, UMRS974, Sorbonne Université, Paris, France; Faculty of Science Sport, Université Paris Cité, Paris, France.
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Joanne P, Hovhannisyan Y, Bencze M, Daher MT, Parlakian A, Toutirais G, Gao-Li J, Lilienbaum A, Li Z, Kordeli E, Ferry A, Agbulut O. Absence of Desmin Results in Impaired Adaptive Response to Mechanical Overloading of Skeletal Muscle. Front Cell Dev Biol 2021; 9:662133. [PMID: 34336827 PMCID: PMC8320001 DOI: 10.3389/fcell.2021.662133] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2021] [Accepted: 06/23/2021] [Indexed: 11/13/2022] Open
Abstract
Background: Desmin is a muscle-specific protein belonging to the intermediate filament family. Desmin mutations are linked to skeletal muscle defects, including inherited myopathies with severe clinical manifestations. The aim of this study was to examine the role of desmin in skeletal muscle remodeling and performance gain induced by muscle mechanical overloading which mimics resistance training. Methods: Plantaris muscles were overloaded by surgical ablation of gastrocnemius and soleus muscles. The functional response of plantaris muscle to mechanical overloading in desmin-deficient mice (DesKO, n = 32) was compared to that of control mice (n = 36) after 7-days or 1-month overloading. To elucidate the molecular mechanisms implicated in the observed partial adaptive response of DesKO muscle, we examined the expression levels of genes involved in muscle growth, myogenesis, inflammation and oxidative energetic metabolism. Moreover, ultrastructure and the proteolysis pathway were explored. Results: Contrary to control, absolute maximal force did not increase in DesKO muscle following 1-month mechanical overloading. Fatigue resistance was also less increased in DesKO as compared to control muscle. Despite impaired functional adaptive response of DesKO mice to mechanical overloading, muscle weight and the number of oxidative MHC2a-positive fibers per cross-section similarly increased in both genotypes after 1-month overloading. However, mechanical overloading-elicited remodeling failed to activate a normal myogenic program after 7-days overloading, resulting in proportionally reduced activation and differentiation of muscle stem cells. Ultrastructural analysis of the plantaris muscle after 1-month overloading revealed muscle fiber damage in DesKO, as indicated by the loss of sarcomere integrity and mitochondrial abnormalities. Moreover, the observed accumulation of autophagosomes and lysosomes in DesKO muscle fibers could indicate a blockage of autophagy. To address this issue, two main proteolysis pathways, the ubiquitin-proteasome system and autophagy, were explored in DesKO and control muscle. Our results suggested an alteration of proteolysis pathways in DesKO muscle in response to mechanical overloading. Conclusion: Taken together, our results show that mechanical overloading increases the negative impact of the lack of desmin on myofibril organization and mitochondria. Furthermore, our results suggest that under these conditions, the repairing activity of autophagy is disturbed. Consequently, force generation is not improved despite muscle growth, suggesting that desmin is required for a complete response to resistance training in skeletal muscle.
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Affiliation(s)
- Pierre Joanne
- Sorbonne Université, Institut de Biologie Paris-Seine (IBPS), CNRS UMR 8256, Inserm ERL U1164, Biological Adaptation and Ageing, Paris, France
| | - Yeranuhi Hovhannisyan
- Sorbonne Université, Institut de Biologie Paris-Seine (IBPS), CNRS UMR 8256, Inserm ERL U1164, Biological Adaptation and Ageing, Paris, France
| | - Maximilien Bencze
- U955-IMRB, Team 10, Biology of the Neuromuscular System, Inserm, UPEC, ENVA, EFS, Créteil, France
| | - Marie-Thérèse Daher
- Sorbonne Université, Institut de Biologie Paris-Seine (IBPS), CNRS UMR 8256, Inserm ERL U1164, Biological Adaptation and Ageing, Paris, France
| | - Ara Parlakian
- Sorbonne Université, Institut de Biologie Paris-Seine (IBPS), CNRS UMR 8256, Inserm ERL U1164, Biological Adaptation and Ageing, Paris, France
| | - Geraldine Toutirais
- Muséum National d'Histoire Naturelle (MNHN), Unité Molécules de Communication et Adaptation des Micro-organismes (MCAM), CNRS UMR 7245, Plateau technique de Microscopie Electronique (PtME), Paris, France
| | - Jacqueline Gao-Li
- Sorbonne Université, Institut de Biologie Paris-Seine (IBPS), CNRS UMR 8256, Inserm ERL U1164, Biological Adaptation and Ageing, Paris, France
| | - Alain Lilienbaum
- Unité de Biologie Fonctionnelle et Adaptative, CNRS UMR 8251, Université de Paris, Paris, France
| | - Zhenlin Li
- Sorbonne Université, Institut de Biologie Paris-Seine (IBPS), CNRS UMR 8256, Inserm ERL U1164, Biological Adaptation and Ageing, Paris, France
| | - Ekaterini Kordeli
- Sorbonne Université, Institut de Biologie Paris-Seine (IBPS), CNRS UMR 8256, Inserm ERL U1164, Biological Adaptation and Ageing, Paris, France
| | - Arnaud Ferry
- Institut de Myologie, INSERM U974, Centre de Recherche en Myologie, Sorbonne Université, Paris, France.,Université de Paris, Paris, France
| | - Onnik Agbulut
- Sorbonne Université, Institut de Biologie Paris-Seine (IBPS), CNRS UMR 8256, Inserm ERL U1164, Biological Adaptation and Ageing, Paris, France
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Abstract
Skeletal muscle hypertrophy can be induced by hormones and growth factors acting directly as positive regulators of muscle growth or indirectly by neutralizing negative regulators, and by mechanical signals mediating the effect of resistance exercise. Muscle growth during hypertrophy is controlled at the translational level, through the stimulation of protein synthesis, and at the transcriptional level, through the activation of ribosomal RNAs and muscle-specific genes. mTORC1 has a central role in the regulation of both protein synthesis and ribosomal biogenesis. Several transcription factors and co-activators, including MEF2, SRF, PGC-1α4, and YAP promote the growth of the myofibers. Satellite cell proliferation and fusion is involved in some but not all muscle hypertrophy models.
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Affiliation(s)
| | - Carlo Reggiani
- Department of Biomedical Sciences, University of Padova, Italy
- Science and Research Centre Koper, Institute for Kinesiology Research, Koper, Slovenia
| | | | - Bert Blaauw
- Venetian Institute of Molecular Medicine, Padova, Italy
- Department of Biomedical Sciences, University of Padova, Italy
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6
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Stantzou A, Relizani K, Morales-Gonzalez S, Gallen C, Grassin A, Ferry A, Schuelke M, Amthor H. Extracellular matrix remodelling is associated with muscle force increase in overloaded mouse plantaris muscle. Neuropathol Appl Neurobiol 2020; 47:218-235. [PMID: 32772401 DOI: 10.1111/nan.12655] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Revised: 07/13/2020] [Accepted: 07/28/2020] [Indexed: 12/31/2022]
Abstract
AIMS Transforming growth factor-β (TGF-β) signalling is thought to contribute to the remodelling of extracellular matrix (ECM) of skeletal muscle and to functional decline in patients with muscular dystrophies. We wanted to determine the role of TGF-β-induced ECM remodelling in dystrophic muscle. METHODS We experimentally induced the pathological hallmarks of severe muscular dystrophy by mechanically overloading the plantaris muscle in mice. Furthermore, we determined the role of TGF-β signalling on dystrophic tissue modulation and on muscle function by (i) overloading myostatin knockout (Mstn-/- ) mice and (ii) by additional pharmacological TGF-β inhibition via halofuginone. RESULTS Transcriptome analysis of overloaded muscles revealed upregulation predominantly of genes associated with ECM, inflammation and metalloproteinase activity. Histology revealed in wild-type mice signs of severe muscular dystrophy including myofibres with large variation in size and internalized myonuclei, as well as increased ECM deposition. At the same time, muscle weight had increased by 208% and muscle force by 234%. Myostatin deficiency blunted the effect of overload on muscle mass (59% increase) and force (76% increase), while having no effect on ECM deposition. Concomitant treatment with halofuginone blunted overload-induced muscle hypertrophy and muscle force increase, while reducing ECM deposition and increasing myofibre size. CONCLUSIONS ECM remodelling is associated with an increase in muscle mass and force in overload-modelled dystrophic muscle. Lack of myostatin is not advantageous and inhibition of ECM deposition by halofuginone is disadvantageous for muscle plasticity in response to stimuli that induce dystrophic muscle.
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Affiliation(s)
- A Stantzou
- Université Paris-Saclay, UVSQ, Inserm, END-ICAP, Versailles, France
| | - K Relizani
- Université Paris-Saclay, UVSQ, Inserm, END-ICAP, Versailles, France.,NeuroCure Cluster of Excellence and Department of Neuropediatrics, Charité-Universitätsmedizin Berlin, Corporate member of the Freie Universität Berlin and Humboldt-Universität zu Berlin, and Berlin Institute of Health, Berlin, Germany
| | - S Morales-Gonzalez
- NeuroCure Cluster of Excellence and Department of Neuropediatrics, Charité-Universitätsmedizin Berlin, Corporate member of the Freie Universität Berlin and Humboldt-Universität zu Berlin, and Berlin Institute of Health, Berlin, Germany
| | - C Gallen
- Université Paris-Saclay, UVSQ, Inserm, END-ICAP, Versailles, France
| | - A Grassin
- Université Paris-Saclay, UVSQ, Inserm, END-ICAP, Versailles, France
| | - A Ferry
- Center for Research in Myology, Pierre et Marie Curie University, Paris Sorbonne, INSERM, UMRS974, CNRS FRE3617, Paris, France.,Université Paris Descartes, Sorbonne Paris Cité, Paris, France
| | - M Schuelke
- NeuroCure Cluster of Excellence and Department of Neuropediatrics, Charité-Universitätsmedizin Berlin, Corporate member of the Freie Universität Berlin and Humboldt-Universität zu Berlin, and Berlin Institute of Health, Berlin, Germany
| | - H Amthor
- Université Paris-Saclay, UVSQ, Inserm, END-ICAP, Versailles, France
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7
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Britto FA, Dumas K, Giorgetti-Peraldi S, Ollendorff V, Favier FB. Is REDD1 a metabolic double agent? Lessons from physiology and pathology. Am J Physiol Cell Physiol 2020; 319:C807-C824. [PMID: 32877205 DOI: 10.1152/ajpcell.00340.2020] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The Akt/mechanistic target of rapamycin (mTOR) signaling pathway governs macromolecule synthesis, cell growth, and metabolism in response to nutrients and growth factors. Regulated in development and DNA damage response (REDD)1 is a conserved and ubiquitous protein, which is transiently induced in response to multiple stimuli. Acting like an endogenous inhibitor of the Akt/mTOR signaling pathway, REDD1 protein has been shown to regulate cell growth, mitochondrial function, oxidative stress, and apoptosis. Recent studies also indicate that timely REDD1 expression limits Akt/mTOR-dependent synthesis processes to spare energy during metabolic stresses, avoiding energy collapse and detrimental consequences. In contrast to this beneficial role for metabolic adaptation, REDD1 chronic expression appears involved in the pathogenesis of several diseases. Indeed, REDD1 expression is found as an early biomarker in many pathologies including inflammatory diseases, cancer, neurodegenerative disorders, depression, diabetes, and obesity. Moreover, prolonged REDD1 expression is associated with cell apoptosis, excessive reactive oxygen species (ROS) production, and inflammation activation leading to tissue damage. In this review, we decipher several mechanisms that make REDD1 a likely metabolic double agent depending on its duration of expression in different physiological and pathological contexts. We also discuss the role played by REDD1 in the cross talk between the Akt/mTOR signaling pathway and the energetic metabolism.
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Affiliation(s)
| | - Karine Dumas
- Université Cote d'Azur, INSERM, UMR1065, C3M, Nice, France
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8
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Hovhannisyan Y, Melikyan G, Mougenot N, Gao-Li J, Friguet B, Paulin D, Li Z, Ferry A, Agbulut O. Effects of the selective inhibition of proteasome caspase-like activity by CLi a derivative of nor-cerpegin in dystrophic mdx mice. PLoS One 2019; 14:e0215821. [PMID: 31013315 PMCID: PMC6478376 DOI: 10.1371/journal.pone.0215821] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2018] [Accepted: 04/09/2019] [Indexed: 12/17/2022] Open
Abstract
Previous studies have shown that proteasome inhibition can have beneficial effects in dystrophic mouse models. In this study, we have investigated the effects of a new selective proteasome inhibitor, CLi, a strong caspase-like inhibitor of the 20S proteasome, on skeletal and cardiac muscle functions of mdx mice. In the first series of experiments, five-month-old male mdx mice (n = 34) were treated with 2 different doses (20 and 100 μg/kg) of CLi and in the second series of experiments, five-month-old female mdx (n = 19) and wild-type (n = 24) mice were treated with 20 μg/kg CLi and Velcade (1 mg/kg) for 1-month. All animals were treadmill exercised twice a week to worsen the dystrophic features. In the first series of experiments, our results demonstrated that 20 μg/kg CLi did not significantly increase absolute and specific maximal forces in skeletal muscle from male mdx mice. Moreover, the higher susceptibility to contraction induced skeletal muscle injury was worsened by 100 μg/kg CLi since the force drop following lengthening contractions was increased with this high dose. Furthermore, we found no differences in the mRNA levels of the molecular markers implicated in dystrophic features. Concerning cardiac function, CLi had no effect on left ventricular function since ejection and shortening fractions were unchanged in male mdx mice. Similarly, CLi did not modify the expression of genes implicated in cardiac remodeling. In the second series of experiments, our results demonstrated an improvement in absolute and specific maximal forces by CLi, whereas Velcade only increased specific maximal force in female mdx mice. In addition, exercise tolerance was not improved by CLi. Taken together, our results show that CLi treatment can only improve maximal force production in exercised female mdx mice without affecting either exercice tolerance capacity or cardiac function. In conclusion, selective inhibition of caspase-like activity of proteasome with CLi has no compelling beneficial effect in dystrophic mdx mice.
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Affiliation(s)
- Yeranuhi Hovhannisyan
- Sorbonne Université, Institut de Biologie Paris-Seine (IBPS), CNRS UMR 8256, Inserm ERL U1164, Biological Adaptation and Ageing, Paris, France
| | - Gagik Melikyan
- Yerevan State University, Department of Organic Chemistry, Yerevan, Armenia
| | | | - Jacqueline Gao-Li
- Sorbonne Université, Institut de Biologie Paris-Seine (IBPS), CNRS UMR 8256, Inserm ERL U1164, Biological Adaptation and Ageing, Paris, France
| | - Bertrand Friguet
- Sorbonne Université, Institut de Biologie Paris-Seine (IBPS), CNRS UMR 8256, Inserm ERL U1164, Biological Adaptation and Ageing, Paris, France
| | - Denise Paulin
- Sorbonne Université, Institut de Biologie Paris-Seine (IBPS), CNRS UMR 8256, Inserm ERL U1164, Biological Adaptation and Ageing, Paris, France
| | - Zhenlin Li
- Sorbonne Université, Institut de Biologie Paris-Seine (IBPS), CNRS UMR 8256, Inserm ERL U1164, Biological Adaptation and Ageing, Paris, France
| | - Arnaud Ferry
- Sorbonne Université, Centre de Recherche en Myologie, Institut de Myologie, INSERM U974, Paris, France
- Sorbonne Paris Cité, Université Paris Descartes, Paris, France
| | - Onnik Agbulut
- Sorbonne Université, Institut de Biologie Paris-Seine (IBPS), CNRS UMR 8256, Inserm ERL U1164, Biological Adaptation and Ageing, Paris, France
- * E-mail:
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9
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Ueberschlag-Pitiot V, Stantzou A, Messéant J, Lemaitre M, Owens DJ, Noirez P, Roy P, Agbulut O, Metzger D, Ferry A. Gonad-related factors promote muscle performance gain during postnatal development in male and female mice. Am J Physiol Endocrinol Metab 2017; 313:E12-E25. [PMID: 28351832 DOI: 10.1152/ajpendo.00446.2016] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/13/2016] [Revised: 02/22/2017] [Accepted: 03/22/2017] [Indexed: 11/22/2022]
Abstract
To better define the role of male and female gonad-related factors (MGRF, presumably testosterone, and FGRF, presumably estradiol, respectively) on mouse hindlimb skeletal muscle contractile performance/function gain during postnatal development, we analyzed the effect of castration initiated before puberty in male and female mice. We found that muscle absolute and specific (normalized to muscle weight) maximal forces were decreased in 6-mo-old male and female castrated mice compared with age- and sex-matched intact mice, without alteration in neuromuscular transmission. Moreover, castration decreased absolute and specific maximal powers, another important aspect of muscle performance, in 6-mo-old males, but not in females. Absolute maximal force was similarly reduced by castration in 3-mo-old muscle fiber androgen receptor (AR)-deficient and wild-type male mice, indicating that the effect of MGRF was muscle fiber AR independent. Castration reduced the muscle weight gain in 3-mo mice of both sexes and in 6-mo females but not in males. We also found that bone morphogenetic protein signaling through Smad1/5/9 was not altered by castration in atrophic muscle of 3-mo-old mice of both sexes. Moreover, castration decreased the sexual dimorphism regarding muscle performance. Together, these results demonstrated that in the long term, MGRF and FGRF promote muscle performance gain in mice during postnatal development, independently of muscle growth in males, largely via improving muscle contractile quality (force and power normalized), and that MGFR and FGRF also contribute to sexual dimorphism. However, the mechanisms underlying MGFR and FGRF actions remain to be determined.
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Affiliation(s)
- Vanessa Ueberschlag-Pitiot
- Institut de Génétique et de Biologie Moléculaire et Cellulaire, Université de Strasbourg, CNRS UMR7104/INSERM U964, Illkirch, France
| | - Amalia Stantzou
- Sorbonne Universités, Université Pierre et Marie Curie-Paris6, Myology Research Center, UM76 and INSERM U974 and CNRS FRE 3617 and Institut de Myologie, Paris, France
| | - Julien Messéant
- Sorbonne Universités, Université Pierre et Marie Curie-Paris6, Myology Research Center, UM76 and INSERM U974 and CNRS FRE 3617 and Institut de Myologie, Paris, France
| | - Megane Lemaitre
- Sorbonne Universités, Université Pierre et Marie Curie-Paris6, Myology Research Center, UM76 and INSERM U974 and CNRS FRE 3617 and Institut de Myologie, Paris, France
| | - Daniel J Owens
- Sorbonne Universités, Université Pierre et Marie Curie-Paris6, Myology Research Center, UM76 and INSERM U974 and CNRS FRE 3617 and Institut de Myologie, Paris, France
| | - Philippe Noirez
- Institut de Recherche Biomédicale et D'épidemiologie du Sport, EA 7329, Institut National du Sport de l'Expertise et de la Performance, Laboratory of Excellence GR-Ex, Paris, France
- Université Sorbonne Paris Cité, Université Paris Descartes, Paris, France; and
| | - Pauline Roy
- Sorbonne Universités, Université Pierre et Marie Curie-Paris6, Myology Research Center, UM76 and INSERM U974 and CNRS FRE 3617 and Institut de Myologie, Paris, France
| | - Onnik Agbulut
- Sorbonne Universités, Université Pierre et Marie Curie-Paris6, Institut de Biologie Paris-Seine, UMR CNRS 8256, Biological Adaptation and Ageing, Paris, France
| | - Daniel Metzger
- Institut de Génétique et de Biologie Moléculaire et Cellulaire, Université de Strasbourg, CNRS UMR7104/INSERM U964, Illkirch, France
| | - Arnaud Ferry
- Sorbonne Universités, Université Pierre et Marie Curie-Paris6, Myology Research Center, UM76 and INSERM U974 and CNRS FRE 3617 and Institut de Myologie, Paris, France;
- Université Sorbonne Paris Cité, Université Paris Descartes, Paris, France; and
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LUCIANO TF, MARQUES SO, PIERI BL, DE SOUZA DR, ARAÚJO LV, NESI RT, SCHEFFER DL, COMIN VH, PINHO RA, MULLER AP, DE SOUZA CT. Responses of Skeletal Muscle Hypertrophy in Wistar Rats to Different Resistance Exercise Models. Physiol Res 2017; 66:317-323. [DOI: 10.33549/physiolres.933256] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
This study aimed to compare the effects of three different resistance exercise models on the quadriceps muscle cross-sectional area, as well as on mTOR phosphorylation and other pivotal molecules involved in the upstream regulation of mTOR. Twenty-four male Wistar rats were divided into untrained (control), endurance resistance training, strength resistance training, and hypertrophy resistance training (HRT) groups (n=6). After 12 weeks of training, the red portion of the quadriceps was removed for histological and Western blot analyses. The results showed that the quadriceps weight and cross-sectional areas in the exercised groups were higher than those of the untrained rats. However, the HRT group presented better results than the other two experimental groups. This same pattern was observed for mTOR phosphorylation and for the most pivotal molecules involved in the upstream control of mTOR (increase of PKB, 14-3-3, ERK, p38 MAPK, and 4E-BP1 phosphorylation, and reduction of tuberin, sestrin 2, REDD1, and phospho AMPK). In summary, our study showed that HRT leads to high levels of mTOR phosphorylation as well as of other proteins involved in the upstream regulation of mTOR.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | - C. T. DE SOUZA
- Laboratory of Exercise Biochemistry and Physiology, Health Sciences Unit, University of Extremo Sul Catarinense, Criciúma, SC, Brazil
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11
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Egner IM, Bruusgaard JC, Gundersen K. An apparent lack of effect of satellite cell depletion on hypertrophy could be due to methodological limitations. Response to ‘Methodological issues limit interpretation of negative effects of satellite cell depletion on adult muscle hypertrophy’. Development 2017; 144:1365-1367. [DOI: 10.1242/dev.148163] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Ingrid M. Egner
- Department of Biosciences, University of Oslo, Blindern, Oslo N-0316, Norway
| | - Jo C. Bruusgaard
- Department of Biosciences, University of Oslo, Blindern, Oslo N-0316, Norway
- Department of Health Sciences, Kristiania University College, P.O. Box 1190, Sentrum, Oslo N-0107, Norway
| | - Kristian Gundersen
- Department of Biosciences, University of Oslo, Blindern, Oslo N-0316, Norway
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12
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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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13
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Ferry A, Benchaouir R, Joanne P, Peat RA, Mougenot N, Agbulut O, Butler-Browne G. Effect of voluntary physical activity initiated at age 7 months on skeletal hindlimb and cardiac muscle function in mdx mice of both genders. Muscle Nerve 2015; 52:788-94. [PMID: 25704632 DOI: 10.1002/mus.24604] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2014] [Revised: 02/04/2015] [Accepted: 02/09/2015] [Indexed: 12/27/2022]
Abstract
INTRODUCTION The effects of voluntary activity initiated in adult mdx (C57BL/10ScSc-DMD(mdx) /J) mice on skeletal and cardiac muscle function have not been studied extensively. METHODS We studied the effects of 3 months of voluntary wheel running initiated at age 7 months on hindlimb muscle weakness, increased susceptibility to muscle contraction-induced injury, and left ventricular function in mdx mice. RESULTS We found that voluntary wheel running did not worsen the deficit in force-generating capacity and the force drop after lengthening contractions in either mdx mouse gender. It increased the absolute maximal force of skeletal muscle in female mdx mice. Moreover, it did not affect left ventricular function, structural heart dimensions, cardiac gene expression of inflammation, fibrosis, or remodeling markers. CONCLUSION These results indicate that voluntary activity initiated at age 7 months had no detrimental effects on skeletal or cardiac muscles in either mdx mouse gender.
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Affiliation(s)
- Arnaud Ferry
- Université Pierre et Marie Curie-Paris 6, Sorbonne Universités, UMR S794, INSERM, U974, CNRS UMR 7215, Institut de Myologie, Paris, France.,Université Paris Descartes, Sorbonne Paris Cité, Paris, France
| | - Rachid Benchaouir
- Université de Versailles Saint Quentin en Yvelines, Inflammation et thérapeutiques, Montigny-le-Bretonneux, France
| | - Pierre Joanne
- Université Pierre et Marie Curie 6, Sorbonne Universités, UMR CNRS 8256, Biological Adaptation and Ageing, Paris, France
| | - Rachel A Peat
- Université Pierre et Marie Curie-Paris 6, Sorbonne Universités, UMR S956, INSERM, ICAN Institute for Cardiometabolism and Nutrition, Paris, France
| | - Nathalie Mougenot
- Université Pierre et Marie Curie-Paris 6, Sorbonne Universités, PECVM, Paris, France
| | - Onnik Agbulut
- Université Pierre et Marie Curie 6, Sorbonne Universités, UMR CNRS 8256, Biological Adaptation and Ageing, Paris, France
| | - Gillian Butler-Browne
- Université Pierre et Marie Curie-Paris 6, Sorbonne Universités, UMR S794, INSERM, U974, CNRS UMR 7215, Institut de Myologie, Paris, France
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14
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Mechanical Overloading Increases Maximal Force and Reduces Fragility in Hind Limb Skeletal Muscle from Mdx Mouse. THE AMERICAN JOURNAL OF PATHOLOGY 2015; 185:2012-24. [DOI: 10.1016/j.ajpath.2015.03.027] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2014] [Revised: 01/30/2015] [Accepted: 03/09/2015] [Indexed: 12/20/2022]
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15
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Ferry A, Schuh M, Parlakian A, Mgrditchian T, Valnaud N, Joanne P, Butler-Browne G, Agbulut O, Metzger D. Myofiber androgen receptor promotes maximal mechanical overload-induced muscle hypertrophy and fiber type transition in male mice. Endocrinology 2014; 155:4739-48. [PMID: 25216388 DOI: 10.1210/en.2014-1195] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
The first aim of this study was to examine the role of myofiber androgen receptor (AR) in male mice on muscle performance gain and remodeling-induced muscle mechanical overloading (OVL) that mimics resistance training. The response of OVL in mice in which AR is selectively ablated in myofibers (AR(skm-/y)) was compared with that of wild-type (WT) mice. In addition, we determined whether the synthetic anabolic androgen nandrolone administration affects the OVL response. We found that OVL increased absolute maximal force and fatigue resistance in both mouse genotypes (P < .05). However, the absolute maximal force increased more in AR(skm-/y) mice as compared with WT mice (+88% vs +63%) (P < .05). Muscle weight increased less in response to OVL in AR(skm-/y) mice (+54%) than in WT mice (+115%) (P < .05). The fiber number per cross-section similarly increased in both mouse genotypes after OVL (P < .05). In contrast to WT mice, the diameter of the fibers expressing myosin heavy chain (MHC)-2x decreased after OVL in AR(skm-/y) mice (P < .05). The MHC-2b to MHC-2a fiber type transition in response to OVL was reduced in AR(skm-/y) mice as compared with WT mice (P < .05). Finally, nandrolone administration during OVL did not further improve absolute maximal force and fatigue resistance and markedly alter muscle remodeling in both mouse genotypes. Together, our results indicate that myofiber AR is required for a complete response to OVL and that exogenous androgens do not increase muscle performance during intensive remodeling in male mice.
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Affiliation(s)
- Arnaud Ferry
- Université Pierre et Marie Curie Université Paris 06 (A.F., T.M., N.V., G.B.-B.), Sorbonne Universités, Inserm Unité 974, Centre National de la Recherche Scientifique Unité Mixte de Recherche 7215, Institut de Myologie, F-75013 Paris, France; Université Paris Descartes (A.F.), Sorbonne Paris Cité, F-75006 Paris, France; Institut de Génétique et de Biologie Moléculaire et Cellulaire (M.S., D.M.), Centre National de la Recherche Scientifique Unité Mixte de Recherche 7104, Inserm Unité 964, Université de Strasbourg, Illkirch 67404, France; and Université Pierre et Marie Curie Université Paris 06 (A.P., T.M., P.J., O.A.), Sorbonne Universités, Unité Mixte de Recherche Centre National de la Recherche Scientifique 8256, Biological Adaptation and Ageing, F-75005 Paris, France
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16
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Li Z, Parlakian A, Coletti D, Alonso-Martin S, Hourdé C, Joanne P, Gao-Li J, Blanc J, Ferry A, Paulin D, Xue Z, Agbulut O. Synemin acts as a regulator of signalling molecules during skeletal muscle hypertrophy. J Cell Sci 2014; 127:4589-601. [PMID: 25179606 DOI: 10.1242/jcs.143164] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Synemin, a type IV intermediate filament (IF) protein, forms a bridge between IFs and cellular membranes. As an A-kinase-anchoring protein, it also provides temporal and spatial targeting of protein kinase A (PKA). However, little is known about its functional roles in either process. To better understand its functions in muscle tissue, we generated synemin-deficient (Synm(-) (/-)) mice. Synm(-) (/-) mice displayed normal development and fertility but showed a mild degeneration and regeneration phenotype in myofibres and defects in sarcolemma membranes. Following mechanical overload, Synm(-) (/-) mice muscles showed a higher hypertrophic capacity with increased maximal force and fatigue resistance compared with control mice. At the molecular level, increased remodelling capacity was accompanied by decreased myostatin (also known as GDF8) and atrogin (also known as FBXO32) expression, and increased follistatin expression. Furthermore, the activity of muscle-mass control molecules (the PKA RIIα subunit, p70S6K and CREB1) was increased in mutant mice. Finally, analysis of muscle satellite cell behaviour suggested that the absence of synemin could affect the balance between self-renewal and differentiation of these cells. Taken together, our results show that synemin is necessary to maintain membrane integrity and regulates signalling molecules during muscle hypertrophy.
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Affiliation(s)
- Zhenlin Li
- Sorbonne Universités, UPMC Univ Paris 06, UMR CNRS 8256/INSERM ERL U1164, Biological Adaptation and Ageing, Institut de Biologie Paris-Seine, Paris, F-75005 France
| | - Ara Parlakian
- Sorbonne Universités, UPMC Univ Paris 06, UMR CNRS 8256/INSERM ERL U1164, Biological Adaptation and Ageing, Institut de Biologie Paris-Seine, Paris, F-75005 France
| | - Dario Coletti
- Sorbonne Universités, UPMC Univ Paris 06, UMR CNRS 8256/INSERM ERL U1164, Biological Adaptation and Ageing, Institut de Biologie Paris-Seine, Paris, F-75005 France
| | - Sonia Alonso-Martin
- Sorbonne Universités, UPMC Univ-Paris 06, INSERM U974, CNRS UMR7215, Institut de Myologie, Paris-France
| | - Christophe Hourdé
- Sorbonne Universités, UPMC Univ Paris 06, UMR CNRS 8256/INSERM ERL U1164, Biological Adaptation and Ageing, Institut de Biologie Paris-Seine, Paris, F-75005 France
| | - Pierre Joanne
- Sorbonne Universités, UPMC Univ Paris 06, UMR CNRS 8256/INSERM ERL U1164, Biological Adaptation and Ageing, Institut de Biologie Paris-Seine, Paris, F-75005 France
| | - Jacqueline Gao-Li
- Sorbonne Universités, UPMC Univ Paris 06, UMR CNRS 8256/INSERM ERL U1164, Biological Adaptation and Ageing, Institut de Biologie Paris-Seine, Paris, F-75005 France
| | - Jocelyne Blanc
- Sorbonne Universités, UPMC Univ Paris 06, UMR CNRS 8256/INSERM ERL U1164, Biological Adaptation and Ageing, Institut de Biologie Paris-Seine, Paris, F-75005 France
| | - Arnaud Ferry
- Sorbonne Universités, UPMC Univ-Paris 06, INSERM U974, CNRS UMR7215, Institut de Myologie, Paris-France
| | - Denise Paulin
- Sorbonne Universités, UPMC Univ Paris 06, UMR CNRS 8256/INSERM ERL U1164, Biological Adaptation and Ageing, Institut de Biologie Paris-Seine, Paris, F-75005 France
| | - Zhigang Xue
- Sorbonne Universités, UPMC Univ Paris 06, UMR CNRS 8256/INSERM ERL U1164, Biological Adaptation and Ageing, Institut de Biologie Paris-Seine, Paris, F-75005 France
| | - Onnik Agbulut
- Sorbonne Universités, UPMC Univ Paris 06, UMR CNRS 8256/INSERM ERL U1164, Biological Adaptation and Ageing, Institut de Biologie Paris-Seine, Paris, F-75005 France
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17
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Ferry A, Joanne P, Hadj-Said W, Vignaud A, Lilienbaum A, Hourdé C, Medja F, Noirez P, Charbonnier F, Chatonnet A, Chevessier F, Nicole S, Agbulut O, Butler-Browne G. Advances in the understanding of skeletal muscle weakness in murine models of diseases affecting nerve-evoked muscle activity, motor neurons, synapses and myofibers. Neuromuscul Disord 2014; 24:960-72. [PMID: 25042397 DOI: 10.1016/j.nmd.2014.06.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2014] [Revised: 05/23/2014] [Accepted: 06/01/2014] [Indexed: 12/13/2022]
Abstract
Disease processes and trauma affecting nerve-evoked muscle activity, motor neurons, synapses and myofibers cause different levels of muscle weakness, i.e., reduced maximal force production in response to voluntary activation or nerve stimulation. However, the mechanisms of muscle weakness are not well known. Using murine models of amyotrophic lateral sclerosis (SOD1(G93A) transgenic mice), congenital myasthenic syndrome (AChE knockout mice and Musk(V789M/-) mutant mice), Schwartz-Jampel syndrome (Hspg2(C1532YNEO/C1532YNEO) mutant mice) and traumatic nerve injury (Neurotomized wild-type mice), we show that the reduced maximal activation capacity (the ability of the nerve to maximally activate the muscle) explains 52%, 58% and 100% of severe weakness in respectively SOD1(G93A), Neurotomized and Musk mice, whereas muscle atrophy only explains 37%, 27% and 0%. We also demonstrate that the impaired maximal activation capacity observed in SOD1, Neurotomized, and Musk mice is not highly related to Hdac4 gene upregulation. Moreover, in SOD1 and Neurotomized mice our results suggest LC3, Fn14, Bcl3 and Gadd45a as candidate genes involved in the maintenance of the severe atrophic state. In conclusion, our study indicates that muscle weakness can result from the triggering of different signaling pathways. This knowledge may be helpful in designing therapeutic strategies and finding new drug targets for amyotrophic lateral sclerosis, congenital myasthenic syndrome, Schwartz-Jampel syndrome and nerve injury.
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Affiliation(s)
- Arnaud Ferry
- Université Pierre et Marie Curie - Paris 6, Sorbonne Universités, UMR S794, INSERM U974, CNRS UMR 7215, Institut de Myologie, Paris F-75013, France; Université Paris Descartes, Sorbonne Paris Cité, Paris F-75006, France.
| | - Pierre Joanne
- Université Paris Diderot, Sorbonne Paris Cité, CNRS EAC 4413, Unit of Functional and Adaptive Biology, Laboratory of Stress and Pathologies of the Cytoskeleton, Paris F-75013, France
| | - Wahiba Hadj-Said
- Université Pierre et Marie Curie - Paris 6, Sorbonne Universités, UMR S794, INSERM U974, CNRS UMR 7215, Institut de Myologie, Paris F-75013, France
| | - Alban Vignaud
- Université Pierre et Marie Curie - Paris 6, Sorbonne Universités, UMR S794, INSERM U974, CNRS UMR 7215, Institut de Myologie, Paris F-75013, France
| | - Alain Lilienbaum
- Université Paris Diderot, Sorbonne Paris Cité, CNRS EAC 4413, Unit of Functional and Adaptive Biology, Laboratory of Stress and Pathologies of the Cytoskeleton, Paris F-75013, France
| | - Christophe Hourdé
- Université Pierre et Marie Curie - Paris 6, Sorbonne Universités, UMR S794, INSERM U974, CNRS UMR 7215, Institut de Myologie, Paris F-75013, France
| | - Fadia Medja
- Université Pierre et Marie Curie - Paris 6, Sorbonne Universités, UMR S794, INSERM U974, CNRS UMR 7215, Institut de Myologie, Paris F-75013, France
| | - Philippe Noirez
- Université Paris Descartes, Sorbonne Paris Cité, Laboratoire de Biologie de la Nutrition EA 2498, Paris, France
| | - Frederic Charbonnier
- Université Paris Descartes, Sorbonne Paris Cité, CESeM, UMR 8194 CNRS, Paris F-75006, France
| | - Arnaud Chatonnet
- Universités Montpellier 1 et 2, INRA, UMR 866, Montpellier, France
| | - Frederic Chevessier
- Universitätsklinikum Erlangen, Neuropathologisches Institut, Erlangen, Germany
| | - Sophie Nicole
- Université Pierre et Marie Curie - Paris 6, INSERM U975, Centre de recherche de l'Institut Cerveau Moelle, CNRS UMR 7225, Paris, France
| | - Onnik Agbulut
- Université Paris Diderot, Sorbonne Paris Cité, CNRS EAC 4413, Unit of Functional and Adaptive Biology, Laboratory of Stress and Pathologies of the Cytoskeleton, Paris F-75013, France
| | - Gillian Butler-Browne
- Université Pierre et Marie Curie - Paris 6, Sorbonne Universités, UMR S794, INSERM U974, CNRS UMR 7215, Institut de Myologie, Paris F-75013, France
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18
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Camerino GM, Cannone M, Giustino A, Massari AM, Capogrosso RF, Cozzoli A, De Luca A. Gene expression in mdx mouse muscle in relation to age and exercise: aberrant mechanical-metabolic coupling and implications for pre-clinical studies in Duchenne muscular dystrophy. Hum Mol Genet 2014; 23:5720-32. [PMID: 24916377 DOI: 10.1093/hmg/ddu287] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Weakness and fatigability are typical features of Duchenne muscular dystrophy patients and are aggravated in dystrophic mdx mice by chronic treadmill exercise. Mechanical activity modulates gene expression and muscle plasticity. Here, we investigated the outcome of 4 (T4, 8 weeks of age) and 12 (T12, 16 weeks of age) weeks of either exercise or cage-based activity on a large set of genes in the gastrocnemius muscle of mdx and wild-type (WT) mice using quantitative real-time PCR. Basal expression of the exercise-sensitive genes peroxisome-proliferator receptor γ coactivator 1α (Pgc-1α) and Sirtuin1 (Sirt1) was higher in mdx versus WT mice at both ages. Exercise increased Pgc-1α expression in WT mice; Pgc-1α was downregulated by T12 exercise in mdx muscles, along with Sirt1, Pparγ and the autophagy marker Bnip3. Sixteen weeks old mdx mice showed a basal overexpression of the slow Mhc1 isoform and Serca2; T12 exercise fully contrasted this basal adaptation as well as the high expression of follistatin and myogenin. Conversely, T12 exercise was ineffective in WT mice. Damage-related genes such as gp91-phox (NADPH-oxidase2), Tgfβ, Tnfα and c-Src tyrosine kinase were overexpressed in mdx muscles and not affected by exercise. Likewise, the anti-inflammatory adiponectin was lower in T12-exercised mdx muscles. Chronic exercise with minor adaptive effects in WT muscles leads to maladaptation in mdx muscles with a disequilibrium between protective and damaging signals. Increased understanding of the pathways involved in the altered mechanical-metabolic coupling may help guide appropriate physical therapies while better addressing pharmacological interventions in translational research.
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Affiliation(s)
- Giulia Maria Camerino
- Unit of Pharmacology, Department of Pharmacy and Drug Sciences, University of Bari 'A. Moro', Via Orabona 4, 70125 Bari, Italy and
| | - Maria Cannone
- Unit of Pharmacology, Department of Pharmacy and Drug Sciences, University of Bari 'A. Moro', Via Orabona 4, 70125 Bari, Italy and
| | - Arcangela Giustino
- Department of Biomedical Sciences and Human Oncology, University of Bari 'A. Moro', Piazza Giulio Cesare 11, 70124 Bari, Italy
| | - Ada Maria Massari
- Unit of Pharmacology, Department of Pharmacy and Drug Sciences, University of Bari 'A. Moro', Via Orabona 4, 70125 Bari, Italy and
| | - Roberta Francesca Capogrosso
- Unit of Pharmacology, Department of Pharmacy and Drug Sciences, University of Bari 'A. Moro', Via Orabona 4, 70125 Bari, Italy and
| | - Anna Cozzoli
- Unit of Pharmacology, Department of Pharmacy and Drug Sciences, University of Bari 'A. Moro', Via Orabona 4, 70125 Bari, Italy and
| | - Annamaria De Luca
- Unit of Pharmacology, Department of Pharmacy and Drug Sciences, University of Bari 'A. Moro', Via Orabona 4, 70125 Bari, Italy and
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Sakakibara I, Santolini M, Ferry A, Hakim V, Maire P. Six homeoproteins and a Iinc-RNA at the fast MYH locus lock fast myofiber terminal phenotype. PLoS Genet 2014; 10:e1004386. [PMID: 24852826 PMCID: PMC4031048 DOI: 10.1371/journal.pgen.1004386] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2013] [Accepted: 04/02/2014] [Indexed: 12/18/2022] Open
Abstract
Thousands of long intergenic non-coding RNAs (lincRNAs) are encoded by the mammalian genome. However, the function of most of these lincRNAs has not been identified in vivo. Here, we demonstrate a role for a novel lincRNA, linc-MYH, in adult fast-type myofiber specialization. Fast myosin heavy chain (MYH) genes and linc-MYH share a common enhancer, located in the fast MYH gene locus and regulated by Six1 homeoproteins. linc-MYH in nuclei of fast-type myofibers prevents slow-type and enhances fast-type gene expression. Functional fast-sarcomeric unit formation is achieved by the coordinate expression of fast MYHs and linc-MYH, under the control of a common Six-bound enhancer.
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Affiliation(s)
- Iori Sakakibara
- INSERM U1016, Institut Cochin, Paris, France
- CNRS UMR 8104, Paris, France
- Université Paris Descartes, Sorbonne Paris Cité, Paris, France
| | - Marc Santolini
- Laboratoire de Physique Statistique, CNRS, Université P. et M. Curie, Université D. Diderot, École Normale Supérieure, Paris, France
| | - Arnaud Ferry
- CNRS UMR 8104, Paris, France
- Université Pierre et Marie Curie-Paris 6, Sorbonne Universités, UMR S794, INSERM U974, CNRS UMR7215, Institut de Myologie, Paris, France
| | - Vincent Hakim
- Laboratoire de Physique Statistique, CNRS, Université P. et M. Curie, Université D. Diderot, École Normale Supérieure, Paris, France
| | - Pascal Maire
- INSERM U1016, Institut Cochin, Paris, France
- CNRS UMR 8104, Paris, France
- Université Paris Descartes, Sorbonne Paris Cité, Paris, France
- * E-mail:
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20
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Lantier L, Fentz J, Mounier R, Leclerc J, Treebak JT, Pehmøller C, Sanz N, Sakakibara I, Saint‐Amand E, Rimbaud S, Maire P, Marette A, Ventura‐Clapier R, Ferry A, Wojtaszewski JFP, Foretz M, Viollet B. AMPK controls exercise endurance, mitochondrial oxidative capacity, and skeletal muscle integrity. FASEB J 2014; 28:3211-24. [DOI: 10.1096/fj.14-250449] [Citation(s) in RCA: 156] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Louise Lantier
- Institut National de la Santé et de la Recherche Médicale (INSERM), Unité (U)1016Institut CochinParisFrance
- Centre National de la Recherche Scientifique (CNRS)Unité Mixte de Recherche (UMR)8104ParisFrance
- Université Paris Descartes, Sorbonne Paris CitéParisFrance
| | - Joachim Fentz
- Section of Molecular PhysiologyThe August Krogh CentreDepartment of Nutrition, Exercise, and SportsUniversity of CopenhagenCopenhagenDenmark
| | - Rémi Mounier
- Institut National de la Santé et de la Recherche Médicale (INSERM), Unité (U)1016Institut CochinParisFrance
- Centre National de la Recherche Scientifique (CNRS)Unité Mixte de Recherche (UMR)8104ParisFrance
- Université Paris Descartes, Sorbonne Paris CitéParisFrance
| | - Jocelyne Leclerc
- Institut National de la Santé et de la Recherche Médicale (INSERM), Unité (U)1016Institut CochinParisFrance
- Centre National de la Recherche Scientifique (CNRS)Unité Mixte de Recherche (UMR)8104ParisFrance
- Université Paris Descartes, Sorbonne Paris CitéParisFrance
| | - Jonas T. Treebak
- Section of Molecular PhysiologyThe August Krogh CentreDepartment of Nutrition, Exercise, and SportsUniversity of CopenhagenCopenhagenDenmark
| | - Christian Pehmøller
- Section of Molecular PhysiologyThe August Krogh CentreDepartment of Nutrition, Exercise, and SportsUniversity of CopenhagenCopenhagenDenmark
| | - Nieves Sanz
- Institut National de la Santé et de la Recherche Médicale (INSERM), Unité (U)1016Institut CochinParisFrance
- Centre National de la Recherche Scientifique (CNRS)Unité Mixte de Recherche (UMR)8104ParisFrance
- Université Paris Descartes, Sorbonne Paris CitéParisFrance
| | - Iori Sakakibara
- Institut National de la Santé et de la Recherche Médicale (INSERM), Unité (U)1016Institut CochinParisFrance
- Centre National de la Recherche Scientifique (CNRS)Unité Mixte de Recherche (UMR)8104ParisFrance
- Université Paris Descartes, Sorbonne Paris CitéParisFrance
| | | | | | - Pascal Maire
- Institut National de la Santé et de la Recherche Médicale (INSERM), Unité (U)1016Institut CochinParisFrance
- Centre National de la Recherche Scientifique (CNRS)Unité Mixte de Recherche (UMR)8104ParisFrance
- Université Paris Descartes, Sorbonne Paris CitéParisFrance
| | | | | | - Arnaud Ferry
- Université Paris Descartes, Sorbonne Paris CitéParisFrance
- Institut de Myologie, INSERM, U974, CNRS UMR 7215Université Pierre et Marie CurieParisFrance
| | - Jørgen F. P. Wojtaszewski
- Section of Molecular PhysiologyThe August Krogh CentreDepartment of Nutrition, Exercise, and SportsUniversity of CopenhagenCopenhagenDenmark
| | - Marc Foretz
- Institut National de la Santé et de la Recherche Médicale (INSERM), Unité (U)1016Institut CochinParisFrance
- Centre National de la Recherche Scientifique (CNRS)Unité Mixte de Recherche (UMR)8104ParisFrance
- Université Paris Descartes, Sorbonne Paris CitéParisFrance
| | - Benoit Viollet
- Institut National de la Santé et de la Recherche Médicale (INSERM), Unité (U)1016Institut CochinParisFrance
- Centre National de la Recherche Scientifique (CNRS)Unité Mixte de Recherche (UMR)8104ParisFrance
- Université Paris Descartes, Sorbonne Paris CitéParisFrance
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21
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Spitali P, Grumati P, Hiller M, Chrisam M, Aartsma-Rus A, Bonaldo P. Autophagy is Impaired in the Tibialis Anterior of Dystrophin Null Mice. PLOS CURRENTS 2013; 5. [PMID: 24292657 PMCID: PMC3839594 DOI: 10.1371/currents.md.e1226cefa851a2f079bbc406c0a21e80] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Background Duchenne muscular dystrophy is a lethal, progressive, muscle-wasting disease caused by mutations in the DMD gene. Structural remodelling processes are responsible for muscle atrophy and replacement of myofibers by fibrotic and adipose tissues. Molecular interventions modulating catabolic pathways, such as the ubiquitin-proteasome and the autophagy-lysosome systems, are under development for Duchenne and other muscular dystrophies. The Akt signaling cascade is one of the main pathways involved in protein synthesis and autophagy repression and is known to be up-regulated in dystrophin null mdx mice. Results We report that autophagy is triggered by fasting in the tibialis anterior muscle of control mice but not in mdx mice. Mdx mice show persistent Akt activation upon fasting and failure to increase the expression of FoxO3 regulated autophagy and atrophy genes, such as Bnip3 and Atrogin1. We also provide evidence that autophagy is differentially regulated in mdx tibialis anterior and diaphragm muscles. Conclusions Our data support the concept that autophagy is impaired in the tibialis anterior muscle of mdx mice and that the regulation of autophagy is muscle type dependent. Differences between muscle groups should be considered during the pre-clinical development of therapeutic strategies addressing muscle metabolism.
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Affiliation(s)
- Pietro Spitali
- Department of Human Genetics, Leiden University Medical Center, Leiden, Netherlands
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22
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Hourdé C, Joanne P, Medja F, Mougenot N, Jacquet A, Mouisel E, Pannerec A, Hatem S, Butler-Browne G, Agbulut O, Ferry A. Voluntary physical activity protects from susceptibility to skeletal muscle contraction-induced injury but worsens heart function in mdx mice. THE AMERICAN JOURNAL OF PATHOLOGY 2013; 182:1509-18. [PMID: 23465861 DOI: 10.1016/j.ajpath.2013.01.020] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2012] [Revised: 12/19/2012] [Accepted: 01/14/2013] [Indexed: 12/25/2022]
Abstract
It is well known that inactivity/activity influences skeletal muscle physiological characteristics. However, the effects of inactivity/activity on muscle weakness and increased susceptibility to muscle contraction-induced injury have not been extensively studied in mdx mice, a murine model of Duchenne muscular dystrophy with dystrophin deficiency. In the present study, we demonstrate that inactivity (ie, leg immobilization) worsened the muscle weakness and the susceptibility to contraction-induced injury in mdx mice. Inactivity also mimicked these two dystrophic features in wild-type mice. In contrast, we demonstrate that these parameters can be improved by activity (ie, voluntary wheel running) in mdx mice. Biochemical analyses indicate that the changes induced by inactivity/activity were not related to fiber-type transition but were associated with altered expression of different genes involved in fiber growth (GDF8), structure (Actg1), and calcium homeostasis (Stim1 and Jph1). However, activity reduced left ventricular function (ie, ejection and shortening fractions) in mdx, but not C57, mice. Altogether, our study suggests that muscle weakness and susceptibility to contraction-induced injury in dystrophic muscle could be attributable, at least in part, to inactivity. It also suggests that activity exerts a beneficial effect on dystrophic skeletal muscle but not on the heart.
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Affiliation(s)
- Christophe Hourdé
- Institute of Myology, INSERM U974, CNRS UMR7215, UPMC UM76, Université Pierre et Marie Curie-Paris 6, Sorbonne Universities, Paris, France
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23
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Joanne P, Chourbagi O, Hourdé C, Ferry A, Butler-Browne G, Vicart P, Dumonceaux J, Agbulut O. Viral-mediated expression of desmin mutants to create mouse models of myofibrillar myopathy. Skelet Muscle 2013; 3:4. [PMID: 23425003 PMCID: PMC3599656 DOI: 10.1186/2044-5040-3-4] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2012] [Accepted: 01/28/2013] [Indexed: 12/26/2022] Open
Abstract
Background The clinical features of myofibrillar myopathies display a wide phenotypic heterogeneity. To this date, no studies have evaluated this parameter due to the absence of pertinent animal models. By studying two mutants of desmin, which induce subtle phenotypic differences in patients, we address this issue using an animal model based on the use of adeno-associated virus (AAV) vectors carrying mutated desmin cDNA. Methods After preparation of the vectors, they were injected directly into the tibialis anterior muscles of C57BL/6 mice to allow expression of wild-type (WT) or mutated (R406W or E413K) desmin. Measurements of maximal force were carried out on the muscle in situ and then the injected muscles were analyzed to determine the structural consequences of the desmin mutations on muscle structure (microscopic observations, histology and immunohistochemistry). Results Injection of AAV carrying WT desmin results in the expression of exogenous desmin in 98% of the muscle fibers without any pathological or functional perturbations. Exogenous WT and endogenous desmin are co-localized and no differences were observed compared to non-injected muscle. Expression of desmin mutants in mouse muscles induce morphological changes of muscle fibers (irregular shape and size) and the appearance of desmin accumulations around the nuclei (for R406W) or in subsarcolemmal regions of fibers (for E413K). These accumulations seem to occur and disrupt the Z-line, and a strong regeneration was observed in muscle expressing the R406W desmin, which is not the case for E413K. Moreover, both mutants of desmin studied here induce a decrease in muscle force generation capacity. Conclusions In this study we show that AAV-mediated expression of desmin mutants in mouse muscles recapitulate the aggregation features, the decrease in contractile function and the morphological changes observed in patients with myofibrillar myopathy. More importantly, our results suggest that the R406W desmin mutant induces a robust muscle regeneration, which is not the case for the E413K mutant. This difference could help to explain the phenotypic differences observed in patients. Our results highlight the heterogeneous pathogenic mechanisms between different desmin mutants and open the way for new advances in the study of myofibrillar myopathies.
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Affiliation(s)
- Pierre Joanne
- Université Paris Diderot, Sorbonne Paris Cité, CNRS EAC4413, Unit of Functional and Adaptive Biology, Laboratory of Stress and Pathologies of the Cytoskeleton, 75013, Paris, France
| | - Oussama Chourbagi
- Université Paris Diderot, Sorbonne Paris Cité, CNRS EAC4413, Unit of Functional and Adaptive Biology, Laboratory of Stress and Pathologies of the Cytoskeleton, 75013, Paris, France
| | - Christophe Hourdé
- Department of Aging, Stress and Inflammation, Université Pierre et Marie Curie-Paris 6, Sorbonne Universités, 75005, Paris, France
| | - Arnaud Ferry
- Université Pierre et Marie Curie-Paris 6, Sorbonne Universités, UMR S794, INSERM U974, CNRS UMR7215, Institut de Myologie, 75013, Paris, France.,Université Paris Descartes, Sorbonne Paris Cité, 75006, Paris, France
| | - Gillian Butler-Browne
- Université Pierre et Marie Curie-Paris 6, Sorbonne Universités, UMR S794, INSERM U974, CNRS UMR7215, Institut de Myologie, 75013, Paris, France
| | - Patrick Vicart
- Université Paris Diderot, Sorbonne Paris Cité, CNRS EAC4413, Unit of Functional and Adaptive Biology, Laboratory of Stress and Pathologies of the Cytoskeleton, 75013, Paris, France
| | - Julie Dumonceaux
- Université Pierre et Marie Curie-Paris 6, Sorbonne Universités, UMR S794, INSERM U974, CNRS UMR7215, Institut de Myologie, 75013, Paris, France
| | - Onnik Agbulut
- Université Paris Diderot, Sorbonne Paris Cité, CNRS EAC4413, Unit of Functional and Adaptive Biology, Laboratory of Stress and Pathologies of the Cytoskeleton, 75013, Paris, France
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Enwere EK, Boudreault L, Holbrook J, Timusk K, Earl N, LaCasse E, Renaud JM, Korneluk RG. Loss of cIAP1 attenuates soleus muscle pathology and improves diaphragm function in mdx mice. Hum Mol Genet 2012. [PMID: 23184147 DOI: 10.1093/hmg/dds493] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
The cellular inhibitor of apoptosis 1 (cIAP1) protein is an essential regulator of canonical and noncanonical nuclear factor κB (NF-κB) signaling pathways. NF-κB signaling is known to play important roles in myogenesis and degenerative muscle disorders such as Duchenne muscular dystrophy (DMD), but the involvement of cIAP1 in muscle disease has not been studied directly. Here, we asked whether the loss of cIAP1 would influence the pathology of skeletal muscle in the mdx mouse model of DMD. Double-mutant cIAP1(-/-);mdx mice exhibited reduced muscle damage and decreased fiber centronucleation in the soleus, compared with single-mutant cIAP1(+/+);mdx mice. This improvement in pathology was associated with a reduction in muscle infiltration by macrophages and diminished expression of inflammatory cytokines such as IL-6 and tumor necrosis factor-α. Furthermore, the cIAP1(-/-);mdx mice exhibited reduced serum creatine kinase, and improved exercise endurance associated with improved exercise resilience by the diaphragm. Mechanistically, the loss of cIAP1 was sufficient to drive constitutive activation of the noncanonical NF-κB pathway, which led to increased myoblast fusion in vitro and in vivo. Collectively, these results show that the loss of cIAP1 protects skeletal muscle from the degenerative pathology resulting from systemic loss of dystrophin.
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Affiliation(s)
- Emeka K Enwere
- Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, Ontario, Canada
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