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Borland H, Moore U, Dressman HG, Human A, Mayhew AG, Hilsden H, Rufibach LE, Duong T, Maron E, DeWolf B, Rose K, Siener C, Thiele S, Práxedes NSA, Canal A, Holsten S, Sakamoto C, Pedrosa-Hernández I, Bello L, Alfano LN, Lowes LP, James MK, Straub V. Performance of upper limb entry item to predict forced vital capacity in dysferlin-deficient limb girdle muscular dystrophy. Neuromuscul Disord 2024; 43:20-28. [PMID: 39178649 DOI: 10.1016/j.nmd.2024.08.003] [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: 03/26/2024] [Revised: 08/07/2024] [Accepted: 08/13/2024] [Indexed: 08/26/2024]
Abstract
Dysferlin-deficient limb girdle muscular dystrophy (LGMD R2), also referred to as dysferlinopathy, can be associated with respiratory muscle weakness as the disease progresses. Clinical practice guidelines recommend biennial lung function assessments in patients with dysferlinopathy to screen for respiratory impairment. However, lack of universal access to spirometry equipment and trained specialists makes regular monitoring challenging. This study investigated the use of the Performance of Upper Limb (PUL) clinical scale entry item as a low-cost screening tool to identify patients with dysferlinopathy at risk of respiratory impairment. Using data from 193 patients from the Jain Foundation's International Clinical Outcomes Study, modelling identified a significant positive relationship between the PUL entry item and forced vital capacity (FVC). Eighty-eight percent of patients with the lowest PUL entry item score of 1 presented with FVC % predicted values of <60 %, suggestive of respiratory impairment. By contrast, only 10 % of the remainder of the cohort (PUL entry item of 2 or more) had an FVC of <60 %. This relationship also held true when accounting for ambulatory status, age, and sex as possible confounding factors. In summary, our results suggest that the PUL entry item could be implemented in clinical practice to screen for respiratory impairment where spirometry is not readily available.
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Affiliation(s)
- Holly Borland
- The John Walton Muscular Dystrophy Research Centre, Translational and Clinical Research Institute, Newcastle University and The Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle Upon, Tyne, United Kingdom
| | - Ursula Moore
- The John Walton Muscular Dystrophy Research Centre, Translational and Clinical Research Institute, Newcastle University and The Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle Upon, Tyne, United Kingdom
| | - Heather Gordish Dressman
- Center for Translational Science, Division of Biostatistics and Study Methodology, Children's National Health System, Washington, DC, United States; Pediatrics, Epidemiology and Biostatistics, George Washington University, Washington, DC, United States
| | - Anri Human
- University of Pretoria, Pretoria, South Africa
| | - Anna G Mayhew
- The John Walton Muscular Dystrophy Research Centre, Translational and Clinical Research Institute, Newcastle University and The Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle Upon, Tyne, United Kingdom
| | - Heather Hilsden
- The John Walton Muscular Dystrophy Research Centre, Translational and Clinical Research Institute, Newcastle University and The Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle Upon, Tyne, United Kingdom
| | | | - Tina Duong
- Stanford University, Palo Alto, United States
| | | | - Brittney DeWolf
- Children's National Health System, Washington, DC, United States
| | - Kristy Rose
- Discipline of Physiotherapy, Faculty of Medicine and Health, University of Sydney and the Sydney Children's Hospitals Network, Sydney, Australia
| | - Catherine Siener
- Washington University School of Medicine, St. Louis, MO, United States
| | | | | | | | - Scott Holsten
- Carolinas HealthCare System, Charlotte, United States
| | | | | | | | - Lindsay N Alfano
- Nationwide Children's Hospital, Abigail Wexner Research Inst., Columbus, OH, United States
| | - Linda Pax Lowes
- Nationwide Children's Hospital, Abigail Wexner Research Inst., Columbus, OH, United States
| | - Meredith K James
- The John Walton Muscular Dystrophy Research Centre, Translational and Clinical Research Institute, Newcastle University and The Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle Upon, Tyne, United Kingdom
| | - Volker Straub
- The John Walton Muscular Dystrophy Research Centre, Translational and Clinical Research Institute, Newcastle University and The Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle Upon, Tyne, United Kingdom.
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Lloyd EM, Crew RC, Haynes VR, White RB, Mark PJ, Jackaman C, Papadimitriou JM, Pinniger GJ, Murphy RM, Watt MJ, Grounds MD. Pilot investigations into the mechanistic basis for adverse effects of glucocorticoids in dysferlinopathy. Skelet Muscle 2024; 14:19. [PMID: 39123261 PMCID: PMC11312411 DOI: 10.1186/s13395-024-00350-6] [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: 04/21/2024] [Accepted: 07/19/2024] [Indexed: 08/12/2024] Open
Abstract
BACKGROUND Dysferlinopathies are a clinically heterogeneous group of muscular dystrophies caused by gene mutations resulting in deficiency of the membrane-associated protein dysferlin. They manifest post-growth and are characterised by muscle wasting (primarily in the limb and limb-gridle muscles), inflammation, and replacement of myofibres with adipose tissue. The precise pathomechanism for dysferlinopathy is currently unclear; as such there are no treatments currently available. Glucocorticoids (GCs) are widely used to reduce inflammation and treat muscular dystrophies, but when administered to patients with dysferlinopathy, they have unexpected adverse effects, with accelerated loss of muscle strength. METHODS To investigate the mechanistic basis for the adverse effects of GCs in dysferlinopathy, the potent GC dexamethasone (Dex) was administered for 4-5 weeks (0.5-0.75 µg/mL in drinking water) to dysferlin-deficient BLA/J and normal wild-type (WT) male mice, sampled at 5 (Study 1) or 10 months (Study 2) of age. A wide range of analyses were conducted. Metabolism- and immune-related gene expression was assessed in psoas muscles at both ages and in quadriceps at 10 months of age. For the 10-month-old mice, quadriceps and psoas muscle histology was assessed. Additionally, we investigated the impact of Dex on the predominantly slow and fast-twitch soleus and extensor digitorum longus (EDL) muscles (respectively) in terms of contractile function, myofibre-type composition, and levels of proteins related to contractile function and metabolism, plus glycogen. RESULTS At both ages, many complement-related genes were highly expressed in BLA/J muscles, and WT mice were generally more responsive to Dex than BLA/J. The effects of Dex on BLA/J mice included (i) increased expression of inflammasome-related genes in muscles (at 5 months) and (ii) exacerbated histopathology of quadriceps and psoas muscles at 10 months. A novel observation was pronounced staining for glycogen in many myofibres of the damaged quadriceps muscles, with large pale vacuolated myofibres, suggesting possible myofibre death by oncosis. CONCLUSION These pilot studies provide a new focus for further investigation into the adverse effects of GCs on dysferlinopathic muscles.
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Affiliation(s)
- Erin M Lloyd
- Department of Anatomy, Physiology and Human Biology, School of Human Sciences, The University of Western Australia, Perth, WA, Australia
- Curtin Health Innovation Research Institute, Curtin Medical School, Curtin University, Bentley, WA, Australia
| | - Rachael C Crew
- Department of Anatomy, Physiology and Human Biology, School of Human Sciences, The University of Western Australia, Perth, WA, Australia
- Department of Obstetrics and Gynaecology, University of Cambridge, Cambridge, UK
| | - Vanessa R Haynes
- Department of Anatomy and Physiology, Faculty of Medicine Dentistry and Health Sciences, University of Melbourne, Parkville, VIC, Australia
| | - Robert B White
- MD Education Unit, UWA Medical School, The University of Western Australia, Perth, WA, Australia
| | - Peter J Mark
- Department of Anatomy, Physiology and Human Biology, School of Human Sciences, The University of Western Australia, Perth, WA, Australia
| | - Connie Jackaman
- Curtin Health Innovation Research Institute, Curtin Medical School, Curtin University, Bentley, WA, Australia
| | - John M Papadimitriou
- Department of Pathology and Laboratory Medicine, UWA Medical School, The University of Western Australia, Perth, WA, Australia
| | - Gavin J Pinniger
- Department of Anatomy, Physiology and Human Biology, School of Human Sciences, The University of Western Australia, Perth, WA, Australia
| | - Robyn M Murphy
- Department of Biochemistry and Chemistry, School of Agriculture, Biomedicine and Environment, La Trobe University, Melbourne, VIC, Australia
| | - Matthew J Watt
- Department of Anatomy and Physiology, Faculty of Medicine Dentistry and Health Sciences, University of Melbourne, Parkville, VIC, Australia
| | - Miranda D Grounds
- Department of Anatomy, Physiology and Human Biology, School of Human Sciences, The University of Western Australia, Perth, WA, Australia.
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Khodabukus A, Prabhu NK, Roberts T, Buldo M, Detwiler A, Fralish ZD, Kondash ME, Truskey GA, Koves TR, Bursac N. Bioengineered Model of Human LGMD2B Skeletal Muscle Reveals Roles of Intracellular Calcium Overload in Contractile and Metabolic Dysfunction in Dysferlinopathy. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2400188. [PMID: 38887849 PMCID: PMC11336985 DOI: 10.1002/advs.202400188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2024] [Revised: 03/19/2024] [Indexed: 06/20/2024]
Abstract
Dysferlin is a multi-functional protein that regulates membrane resealing, calcium homeostasis, and lipid metabolism in skeletal muscle. Genetic loss of dysferlin results in limb girdle muscular dystrophy 2B/2R (LGMD2B/2R) and other dysferlinopathies - rare untreatable muscle diseases that lead to permanent loss of ambulation in humans. The mild disease severity in dysferlin-deficient mice and diverse genotype-phenotype relationships in LGMD2B patients have prompted the development of new in vitro models for personalized studies of dysferlinopathy. Here the first 3-D tissue-engineered hiPSC-derived skeletal muscle ("myobundle") model of LGMD2B is described that exhibits compromised contractile function, calcium-handling, and membrane repair, and transcriptomic changes indicative of impaired oxidative metabolism and mitochondrial dysfunction. In response to the fatty acid (FA) challenge, LGMD2B myobundles display mitochondrial deficits and intracellular lipid droplet (LD) accumulation. Treatment with the ryanodine receptor (RyR) inhibitor dantrolene or the dissociative glucocorticoid vamorolone restores LGMD2B contractility, improves membrane repair, and reduces LD accumulation. Lastly, it is demonstrated that chemically induced chronic RyR leak in healthy myobundles phenocopies LGMD2B contractile and metabolic deficit, but not the loss of membrane repair capacity. Together, these results implicate intramyocellular Ca2+ leak as a critical driver of dysferlinopathic phenotype and validate the myobundle system as a platform to study LGMD2B pathogenesis.
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Affiliation(s)
| | - Neel K. Prabhu
- Department of Biomedical EngineeringDuke UniversityDurhamNC27708USA
| | - Taylor Roberts
- Department of Biomedical EngineeringDuke UniversityDurhamNC27708USA
| | - Meghan Buldo
- Department of Biomedical EngineeringDuke UniversityDurhamNC27708USA
| | - Amber Detwiler
- Department of Biomedical EngineeringDuke UniversityDurhamNC27708USA
| | | | - Megan E. Kondash
- Department of Biomedical EngineeringDuke UniversityDurhamNC27708USA
| | | | - Timothy R. Koves
- Duke Molecular Physiology InstituteDuke UniversityDurhamNC27708USA
| | - Nenad Bursac
- Department of Biomedical EngineeringDuke UniversityDurhamNC27708USA
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Bardakov SN, Titova AA, Nikitin SS, Nikitins V, Sokolova MO, Tsargush VA, Yuhno EA, Vetrovoj OV, Carlier PG, Sofronova YV, Isaev АА, Deev RV. Miyoshi myopathy associated with spine rigidity and multiple contractures: a case report. BMC Musculoskelet Disord 2024; 25:146. [PMID: 38365661 PMCID: PMC10870593 DOI: 10.1186/s12891-024-07270-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Accepted: 02/08/2024] [Indexed: 02/18/2024] Open
Abstract
BACKGROUND Dysferlinopathy is a phenotypically heterogeneous group of hereditary diseases caused by mutations in the DYSF gene. Early contractures are considered rare, and rigid spine syndrome in dysferlinopathy has been previously reported only once. CASE PRESENTATION We describe a 23-year-old patient with Miyoshi myopathy with a rigid spine and multiple contractures, a rare phenotypic variant. The disease first manifested when the patient was 13 years old, with fatigue of the gastrocnemius muscles and the development of pronounced contractures of the Achilles tendons, flexors of the fingers, and extensors of the toes, followed by the involvement of large joints and the spine. Magnetic resonance imaging revealed signs of connective tissue and fatty replacement of the posterior muscles of the thighs and lower legs. Edema was noted in the anterior and medial muscle groups of the thighs, lower legs, and the multifidus muscle of the back. Whole genome sequencing revealed previously described mutations in the DYSF gene in exon 39 (c.4282 C > T) and intron 51 (c.5785-824 C > T). An immunohistochemical analysis and Western blot showed the complete absence of dysferlin protein expression in the muscle fibers. CONCLUSIONS This case expands the range of clinical and phenotypic correlations of dysferlinopathy and complements the diagnostic search for spine rigidity.
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Affiliation(s)
- Sergey N Bardakov
- Department of Neurology, S.M. Kirov Military Medical Academy, 6 Lebedeva str., St. Petersburg, 194044, Russia.
| | - Angelina A Titova
- Kazan (Volga Region) Federal University, 18 Kremlyevskaya str., Kazan, 420008, Russia
| | - Sergey S Nikitin
- Research Centre for Medical Genetics, 1 Moskvorechye str., Moscow, 115522, Russia
| | - Valentin Nikitins
- North-Western State Medical University named after I.I. Mechnikov, 47 Piskarevskij prospect, St. Petersburg, 191015, Russia
| | - Margarita O Sokolova
- Department of Neurology, S.M. Kirov Military Medical Academy, 6 Lebedeva str., St. Petersburg, 194044, Russia
| | - Vadim A Tsargush
- Department of Neurology, S.M. Kirov Military Medical Academy, 6 Lebedeva str., St. Petersburg, 194044, Russia
| | - Elena A Yuhno
- FSBI All-Russian Center for Emergency and Radiation Medicine named after A.M. Nikiforov EMERCOM of Russia, 4/2 Lebedev str., St. Petersburg, 194044, Russia
| | - Oleg V Vetrovoj
- Pavlov Institute of Physiology, Russian Academy of Sciences, 6 Makarova emb, St. Petersburg, 199034, Russia
| | - Pierre G Carlier
- Neuromuscular Disease Reference Center, University of Liege, and Department of Neurology, St Luc University Hospital, Avenue Hippocrate 10, Brussels, 1200, Belgium
| | | | - Аrtur А Isaev
- Artgen Biotech PJSC, 3 Gubkina str., Moscow, 119333, Russia
| | - Roman V Deev
- Avtsyn Research Institute of Human Morphology of Federal State Budgetary Scientific Institution "Petrovsky National Research Centre of Surgery", 3 Tsyurupy str., Moscow, 117418, Russia
- Artgen Biotech PJSC, 3 Gubkina str., Moscow, 119333, Russia
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5
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Golding AE, Li W, Blank PS, Cologna SM, Zimmerberg J. Relative quantification of progressive changes in healthy and dysferlin-deficient mouse skeletal muscle proteomes. Muscle Nerve 2023; 68:805-816. [PMID: 37706611 DOI: 10.1002/mus.27975] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Revised: 08/22/2023] [Accepted: 08/23/2023] [Indexed: 09/15/2023]
Abstract
INTRODUCTION/AIMS Individuals with dysferlinopathies, a group of genetic muscle diseases, experience delay in the onset of muscle weakness. The cause of this delay and subsequent muscle wasting are unknown, and there are currently no clinical interventions to limit or prevent muscle weakness. To better understand molecular drivers of dysferlinopathies, age-dependent changes in the proteomic profile of skeletal muscle (SM) in wild-type (WT) and dysferlin-deficient mice were identified. METHODS Quadriceps were isolated from 6-, 18-, 42-, and 77-wk-old C57BL/6 (WT, Dysf+/+ ) and BLAJ (Dysf-/- ) mice (n = 3, 2 male/1 female or 1 male/2 female, 24 total). Whole-muscle proteomes were characterized using liquid chromatography-mass spectrometry with relative quantification using TMT10plex isobaric labeling. Principle component analysis was utilized to detect age-dependent proteomic differences over the lifespan of, and between, WT and dysferlin-deficient SM. The biological relevance of proteins with significant variation was established using Ingenuity Pathway Analysis. RESULTS Over 3200 proteins were identified between 6-, 18-, 42-, and 77-wk-old mice. In total, 46 proteins varied in aging WT SM (p < .01), while 365 varied in dysferlin-deficient SM. However, 569 proteins varied between aged-matched WT and dysferlin-deficient SM. Proteins with significant variation in expression across all comparisons followed distinct temporal trends. DISCUSSION Proteins involved in sarcolemma repair and regeneration underwent significant changes in SM over the lifespan of WT mice, while those associated with immune infiltration and inflammation were overly represented over the lifespan of dysferlin-deficient mice. The proteins identified herein are likely to contribute to our overall understanding of SM aging and dysferlinopathy disease progression.
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Affiliation(s)
- Adriana E Golding
- Section on Integrative Biophysics, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland, USA
- Section on Intracellular Protein Trafficking, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland, USA
| | - Wenping Li
- Department of Chemistry, University of Illinois Chicago, Chicago, Illinois, USA
| | - Paul S Blank
- Section on Integrative Biophysics, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland, USA
| | - Stephanie M Cologna
- Department of Chemistry, University of Illinois Chicago, Chicago, Illinois, USA
| | - Joshua Zimmerberg
- Section on Integrative Biophysics, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland, USA
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6
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Lloyd EM, Pinniger GJ, Murphy RM, Grounds MD. Slow or fast: Implications of myofibre type and associated differences for manifestation of neuromuscular disorders. Acta Physiol (Oxf) 2023; 238:e14012. [PMID: 37306196 DOI: 10.1111/apha.14012] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Revised: 05/30/2023] [Accepted: 06/06/2023] [Indexed: 06/13/2023]
Abstract
Many neuromuscular disorders can have a differential impact on a specific myofibre type, forming the central premise of this review. The many different skeletal muscles in mammals contain a spectrum of slow- to fast-twitch myofibres with varying levels of protein isoforms that determine their distinctive contractile, metabolic, and other properties. The variations in functional properties across the range of classic 'slow' to 'fast' myofibres are outlined, combined with exemplars of the predominantly slow-twitch soleus and fast-twitch extensor digitorum longus muscles, species comparisons, and techniques used to study these properties. Other intrinsic and extrinsic differences are discussed in the context of slow and fast myofibres. These include inherent susceptibility to damage, myonecrosis, and regeneration, plus extrinsic nerves, extracellular matrix, and vasculature, examined in the context of growth, ageing, metabolic syndrome, and sexual dimorphism. These many differences emphasise the importance of carefully considering the influence of myofibre-type composition on manifestation of various neuromuscular disorders across the lifespan for both sexes. Equally, understanding the different responses of slow and fast myofibres due to intrinsic and extrinsic factors can provide deep insight into the precise molecular mechanisms that initiate and exacerbate various neuromuscular disorders. This focus on the influence of different myofibre types is of fundamental importance to enhance translation for clinical management and therapies for many skeletal muscle disorders.
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Affiliation(s)
- Erin M Lloyd
- Department of Anatomy, Physiology and Human Biology, School of Human Sciences, The University of Western Australia, Perth, Western Australia, Australia
- Curtin Health Innovation Research Institute, Curtin Medical School, Curtin University, Bentley, Western Australia, Australia
| | - Gavin J Pinniger
- Department of Anatomy, Physiology and Human Biology, School of Human Sciences, The University of Western Australia, Perth, Western Australia, Australia
| | - Robyn M Murphy
- Department of Biochemistry and Chemistry, School of Agriculture, Biomedicine and Environment, La Trobe University, Melbourne, Victoria, Australia
| | - Miranda D Grounds
- Department of Anatomy, Physiology and Human Biology, School of Human Sciences, The University of Western Australia, Perth, Western Australia, Australia
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Ballouhey O, Chapoton M, Alary B, Courrier S, Da Silva N, Krahn M, Lévy N, Weisleder N, Bartoli M. A Dysferlin Exon 32 Nonsense Mutant Mouse Model Shows Pathological Signs of Dysferlinopathy. Biomedicines 2023; 11:biomedicines11051438. [PMID: 37239109 DOI: 10.3390/biomedicines11051438] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2023] [Revised: 05/09/2023] [Accepted: 05/10/2023] [Indexed: 05/28/2023] Open
Abstract
Dysferlinopathies are a group of autosomal recessive muscular dystrophies caused by pathogenic variants in the DYSF gene. While several animal models of dysferlinopathy have been developed, most of them involve major disruptions of the Dysf gene locus that are not optimal for studying human dysferlinopathy, which is often caused by single nucleotide substitutions. In this study, the authors describe a new murine model of dysferlinopathy that carries a nonsense mutation in Dysf exon 32, which has been identified in several patients with dysferlinopathy. This mouse model, called Dysf p.Y1159X/p.Y1159X, displays several molecular, histological, and functional defects observed in dysferlinopathy patients and other published mouse models. This mutant mouse model is expected to be useful for testing various therapeutic approaches such as termination codon readthrough, pharmacological approaches, and exon skipping. Therefore, the data presented in this study strongly support the use of this animal model for the development of preclinical strategies for the treatment of dysferlinopathies.
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Affiliation(s)
- Océane Ballouhey
- Aix Marseille University, INSERM, MMG, U1251, 13005 Marseille, France
| | - Marie Chapoton
- Aix Marseille University, INSERM, MMG, U1251, 13005 Marseille, France
| | - Benedicte Alary
- Aix Marseille University, INSERM, MMG, U1251, 13005 Marseille, France
| | | | - Nathalie Da Silva
- Aix Marseille University, INSERM, MMG, U1251, 13005 Marseille, France
| | - Martin Krahn
- Aix Marseille University, INSERM, MMG, U1251, 13005 Marseille, France
- Département de Génétique Médicale et de Biologie Cellulaire, AP-HM, Hôpital d'Enfants de la Timone, 13005 Marseille, France
| | - Nicolas Lévy
- Aix Marseille University, INSERM, MMG, U1251, 13005 Marseille, France
- Département de Génétique Médicale et de Biologie Cellulaire, AP-HM, Hôpital d'Enfants de la Timone, 13005 Marseille, France
| | - Noah Weisleder
- Department of Physiology & Cell Biology, Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, Columbus, OH 43210, USA
| | - Marc Bartoli
- Aix Marseille University, INSERM, MMG, U1251, 13005 Marseille, France
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8
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Rufibach L, Berger K, Chakravorty S, Emmons S, Long L, Gibson G, Hegde M. Utilization of Targeted RNA-Seq for the Resolution of Variant Pathogenicity and Enhancement of Diagnostic Yield in Dysferlinopathy. J Pers Med 2023; 13:jpm13030520. [PMID: 36983702 PMCID: PMC10056012 DOI: 10.3390/jpm13030520] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Revised: 02/28/2023] [Accepted: 03/08/2023] [Indexed: 03/15/2023] Open
Abstract
For inherited diseases, obtaining a definitive diagnosis is critical for proper disease management, family planning, and participation in clinical trials. This can be challenging for dysferlinopathy due to the significant clinical overlap between the 30+ subtypes of limb–girdle muscular dystrophy (LGMD) and the large number of variants of unknown significance (VUSs) that are identified in the dysferlin gene, DYSF. We performed targeted RNA-Seq using a custom gene-panel in 77 individuals with a clinical/genetic suspicion of dysferlinopathy and evaluated all 111 identified DYSF variants according to the American College of Medical Genetics and Genomics and the Association for Molecular Pathology (ACMG/AMP) guidelines. This evaluation identified 11 novel DYSF variants and allowed for the classification of 87 DYSF variants as pathogenic/likely pathogenic, 8 likely benign, while 16 variants remained VUSs. By the end of the study, 60 of the 77 cases had a definitive diagnosis of dysferlinopathy, which was a 47% increase in diagnostic yield over the rate at study onset. This data shows the ability of RNA-Seq to assist in variant pathogenicity classification and diagnosis of dysferlinopathy and is, therefore, a type of analysis that should be considered when DNA-based genetic analysis is not sufficient to provide a definitive diagnosis.
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Affiliation(s)
- Laura Rufibach
- Jain Foundation, Inc., Seattle, WA 98115, USA; (S.E.); (L.L.)
- Correspondence:
| | - Kiera Berger
- Center for Integrative Genomics, Georgia Institute of Technology, Atlanta, GA 30332, USA; (K.B.); (G.G.)
| | - Samya Chakravorty
- Department of Human Genetics, Emory University School of Medicine, Atlanta, GA 30322, USA; (S.C.); (M.H.)
- Department of Pediatrics, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Sarah Emmons
- Jain Foundation, Inc., Seattle, WA 98115, USA; (S.E.); (L.L.)
| | - Laurie Long
- Jain Foundation, Inc., Seattle, WA 98115, USA; (S.E.); (L.L.)
| | - Greg Gibson
- Center for Integrative Genomics, Georgia Institute of Technology, Atlanta, GA 30332, USA; (K.B.); (G.G.)
| | - Madhuri Hegde
- Department of Human Genetics, Emory University School of Medicine, Atlanta, GA 30322, USA; (S.C.); (M.H.)
- PerkinElmer Genomics, Global Laboratory Services, Waltham, MA 02451, USA
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9
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Yasa J, Reed CE, Bournazos AM, Evesson FJ, Pang I, Graham ME, Wark JR, Nijagal B, Kwan KH, Kwiatkowski T, Jung R, Weisleder N, Cooper ST, Lemckert FA. Minimal expression of dysferlin prevents development of dysferlinopathy in dysferlin exon 40a knockout mice. Acta Neuropathol Commun 2023; 11:15. [PMID: 36653852 PMCID: PMC9847081 DOI: 10.1186/s40478-022-01473-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2022] [Accepted: 11/03/2022] [Indexed: 01/19/2023] Open
Abstract
Dysferlin is a Ca2+-activated lipid binding protein implicated in muscle membrane repair. Recessive variants in DYSF result in dysferlinopathy, a progressive muscular dystrophy. We showed previously that calpain cleavage within a motif encoded by alternatively spliced exon 40a releases a 72 kDa C-terminal minidysferlin recruited to injured sarcolemma. Herein we use CRISPR/Cas9 gene editing to knock out murine Dysf exon 40a, to specifically assess its role in membrane repair and development of dysferlinopathy. We created three Dysf exon 40a knockout (40aKO) mouse lines that each express different levels of dysferlin protein ranging from ~ 90%, ~ 50% and ~ 10-20% levels of wild-type. Histopathological analysis of skeletal muscles from all 12-month-old 40aKO lines showed virtual absence of dystrophic features and normal membrane repair capacity for all three 40aKO lines, as compared with dysferlin-null BLAJ mice. Further, lipidomic and proteomic analyses on 18wk old quadriceps show all three 40aKO lines are spared the profound lipidomic/proteomic imbalance that characterises dysferlin-deficient BLAJ muscles. Collective results indicate that membrane repair does not depend upon calpain cleavage within exon 40a and that ~ 10-20% of WT dysferlin protein expression is sufficient to maintain the muscle lipidome, proteome and membrane repair capacity to crucially prevent development of dysferlinopathy.
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Affiliation(s)
- Joe Yasa
- grid.413973.b0000 0000 9690 854XKids Neuroscience Centre, The Children’s Hospital at Westmead, Cnr Hawkesbury Road, Hainsworth Street, Westmead, Sydney, NSW 2145 Australia ,grid.414235.50000 0004 0619 2154Functional Neuromics, Children’s Medical Research Institute, Westmead, Sydney, NSW Australia
| | - Claudia E. Reed
- grid.413973.b0000 0000 9690 854XKids Neuroscience Centre, The Children’s Hospital at Westmead, Cnr Hawkesbury Road, Hainsworth Street, Westmead, Sydney, NSW 2145 Australia ,grid.1013.30000 0004 1936 834XDiscipline of Child and Adolescent Health, Faculty of Medicine, University of Sydney, Sydney, NSW Australia
| | - Adam M. Bournazos
- grid.413973.b0000 0000 9690 854XKids Neuroscience Centre, The Children’s Hospital at Westmead, Cnr Hawkesbury Road, Hainsworth Street, Westmead, Sydney, NSW 2145 Australia ,grid.1013.30000 0004 1936 834XDiscipline of Child and Adolescent Health, Faculty of Medicine, University of Sydney, Sydney, NSW Australia
| | - Frances J. Evesson
- grid.413973.b0000 0000 9690 854XKids Neuroscience Centre, The Children’s Hospital at Westmead, Cnr Hawkesbury Road, Hainsworth Street, Westmead, Sydney, NSW 2145 Australia ,grid.414235.50000 0004 0619 2154Functional Neuromics, Children’s Medical Research Institute, Westmead, Sydney, NSW Australia ,grid.1013.30000 0004 1936 834XDiscipline of Child and Adolescent Health, Faculty of Medicine, University of Sydney, Sydney, NSW Australia
| | - Ignatius Pang
- grid.414235.50000 0004 0619 2154Synapse Proteomics, Children’s Medical Research Institute, The University of Sydney, Westmead, NSW Australia
| | - Mark E. Graham
- grid.414235.50000 0004 0619 2154Synapse Proteomics, Children’s Medical Research Institute, The University of Sydney, Westmead, NSW Australia
| | - Jesse R. Wark
- grid.1013.30000 0004 1936 834XOperations, Children’s Medical Research Institute, The University of Sydney, Westmead, NSW Australia
| | - Brunda Nijagal
- grid.1008.90000 0001 2179 088XMetabolomics Australia, Bio21 Institute, The University of Melbourne, Victoria, Australia
| | - Kim H. Kwan
- grid.1008.90000 0001 2179 088XMetabolomics Australia, Bio21 Institute, The University of Melbourne, Victoria, Australia
| | - Thomas Kwiatkowski
- grid.268132.c0000 0001 0701 2416West Chester University, West Chester, PA 19383 USA
| | - Rachel Jung
- grid.412332.50000 0001 1545 0811Department of Physiology and Cell Biology, Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, Columbus, OH 43210-1252 USA
| | - Noah Weisleder
- grid.412332.50000 0001 1545 0811Department of Physiology and Cell Biology, Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, Columbus, OH 43210-1252 USA
| | - Sandra T. Cooper
- grid.413973.b0000 0000 9690 854XKids Neuroscience Centre, The Children’s Hospital at Westmead, Cnr Hawkesbury Road, Hainsworth Street, Westmead, Sydney, NSW 2145 Australia ,grid.414235.50000 0004 0619 2154Functional Neuromics, Children’s Medical Research Institute, Westmead, Sydney, NSW Australia ,grid.1013.30000 0004 1936 834XDiscipline of Child and Adolescent Health, Faculty of Medicine, University of Sydney, Sydney, NSW Australia
| | - Frances A. Lemckert
- grid.413973.b0000 0000 9690 854XKids Neuroscience Centre, The Children’s Hospital at Westmead, Cnr Hawkesbury Road, Hainsworth Street, Westmead, Sydney, NSW 2145 Australia ,grid.414235.50000 0004 0619 2154Functional Neuromics, Children’s Medical Research Institute, Westmead, Sydney, NSW Australia ,grid.1013.30000 0004 1936 834XDiscipline of Child and Adolescent Health, Faculty of Medicine, University of Sydney, Sydney, NSW Australia
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10
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Lloyd EM, Pinniger GJ, Grounds MD, Murphy RM. Dysferlin Deficiency Results in Myofiber-Type Specific Differences in Abundances of Calcium-Handling and Glycogen Metabolism Proteins. Int J Mol Sci 2022; 24:ijms24010076. [PMID: 36613515 PMCID: PMC9820290 DOI: 10.3390/ijms24010076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Revised: 12/14/2022] [Accepted: 12/14/2022] [Indexed: 12/24/2022] Open
Abstract
Dysferlinopathies are a clinically heterogeneous group of muscular dystrophies caused by a genetic deficiency of the membrane-associated protein dysferlin, which usually manifest post-growth in young adults. The disease is characterized by progressive skeletal muscle wasting in the limb-girdle and limbs, inflammation, accumulation of lipid droplets in slow-twitch myofibers and, in later stages, replacement of muscles by adipose tissue. Previously we reported myofiber-type specific differences in muscle contractile function of 10-month-old dysferlin-deficient BLAJ mice that could not be fully accounted for by altered myofiber-type composition. In order to further investigate these findings, we examined the impact of dysferlin deficiency on the abundance of calcium (Ca2+) handling and glucose/glycogen metabolism-related proteins in predominantly slow-twitch, oxidative soleus and fast-twitch, glycolytic extensor digitorum longus (EDL) muscles of 10-month-old wild-type (WT) C57BL/6J and dysferlin-deficient BLAJ male mice. Additionally, we compared the Ca2+ activation properties of isolated slow- and fast-twitch myofibers from 3-month-old WT and BLAJ male mice. Differences were observed for some Ca2+ handling and glucose/glycogen metabolism-related protein levels between BLAJ soleus and EDL muscles (compared with WT) that may contribute to the previously reported differences in function in these BLAJ muscles. Dysferlin deficiency did not impact glycogen content of whole muscles nor Ca2+ activation of the myofilaments, although soleus muscle from 10-month-old BLAJ mice had more glycogen than EDL muscles. These results demonstrate a further impact of dysferlin deficiency on proteins associated with excitation-contraction coupling and glycogen metabolism in skeletal muscles, potentially contributing to altered contractile function in dysferlinopathy.
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Affiliation(s)
- Erin M. Lloyd
- Department of Anatomy, Physiology and Human Biology, School of Human Sciences, The University of Western Australia, Perth, WA 6009, Australia
| | - Gavin J. Pinniger
- Department of Anatomy, Physiology and Human Biology, School of Human Sciences, The University of Western Australia, Perth, WA 6009, Australia
| | - Miranda D. Grounds
- Department of Anatomy, Physiology and Human Biology, School of Human Sciences, The University of Western Australia, Perth, WA 6009, Australia
- Correspondence:
| | - Robyn M. Murphy
- Department of Biochemistry and Chemistry, School of Agriculture, Biomedicine and Environment, La Trobe University, Melbourne, VIC 3086, Australia
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11
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White Z, Sun Z, Sauge E, Cox D, Donen G, Pechkovsky D, Straub V, Francis GA, Bernatchez P. Limb-girdle muscular dystrophy type 2B causes HDL-C abnormalities in patients and statin-resistant muscle wasting in dysferlin-deficient mice. Skelet Muscle 2022; 12:25. [PMID: 36447272 PMCID: PMC9706908 DOI: 10.1186/s13395-022-00308-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Accepted: 11/11/2022] [Indexed: 12/03/2022] Open
Abstract
Limb-girdle muscular dystrophy (MD) type 2B (LGMD2B) and Duchenne MD (DMD) are caused by mutations to the Dysferlin and Dystrophin genes, respectively. We have recently demonstrated in typically mild dysferlin- and dystrophin-deficient mouse models that increased plasma cholesterol levels severely exacerbate muscle wasting, and that DMD patients display primary dyslipidemia characterized by elevated plasma cholesterol and triglycerides. Herein, we investigate lipoprotein abnormalities in LGMD2B and if statin therapy protects dysferlin-deficient mice (Dysf) from muscle damage. Herein, lipoproteins and liver enzymes from LGMD2B patients and dysferlin-null (Dysf) mice were analyzed. Simvastatin, which exhibits anti-muscle wasting effects in mouse models of DMD and corrects aberrant expression of key markers of lipid metabolism and endogenous cholesterol synthesis, was tested in Dysf mice. Muscle damage and fibrosis were assessed by immunohistochemistry and cholesterol signalling pathways via Western blot. LGMD2B patients show reduced serum high-density lipoprotein cholesterol (HDL-C) levels compared to healthy controls and exhibit a greater prevalence of abnormal total cholesterol (CHOL)/HDL-C ratios despite an absence of liver dysfunction. While Dysf mice presented with reduced CHOL and associated HDL-C and LDL-C-associated fractions, simvastatin treatment did not prevent muscle wasting in quadriceps and triceps muscle groups or correct aberrant low-density lipoprotein receptor (LDLR) and 3-hydroxy-3-methylglutaryl coenzyme A reductase (HMGCR) protein expression. LGMD2B patients present with reduced serum concentrations of HDL-C, a major metabolic comorbidity, and as a result, statin therapy is unlikely to prevent muscle wasting in this population. We propose that like DMD, LGMD2B should be considered as a new type of genetic dyslipidemia.
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Affiliation(s)
- Zoe White
- grid.17091.3e0000 0001 2288 9830Department of Anesthesiology, Pharmacology & Therapeutics, University of British Columbia (UBC), 217-2176 Health Sciences Mall, Vancouver, BC V6T 1Z3 Canada ,grid.416553.00000 0000 8589 2327UBC Centre for Heart Lung Innovation, St. Paul’s Hospital, Vancouver, Canada
| | - Zeren Sun
- grid.17091.3e0000 0001 2288 9830Department of Anesthesiology, Pharmacology & Therapeutics, University of British Columbia (UBC), 217-2176 Health Sciences Mall, Vancouver, BC V6T 1Z3 Canada ,grid.416553.00000 0000 8589 2327UBC Centre for Heart Lung Innovation, St. Paul’s Hospital, Vancouver, Canada
| | - Elodie Sauge
- grid.17091.3e0000 0001 2288 9830Department of Anesthesiology, Pharmacology & Therapeutics, University of British Columbia (UBC), 217-2176 Health Sciences Mall, Vancouver, BC V6T 1Z3 Canada ,grid.416553.00000 0000 8589 2327UBC Centre for Heart Lung Innovation, St. Paul’s Hospital, Vancouver, Canada
| | - Dan Cox
- grid.1006.70000 0001 0462 7212Newcastle University Translational and Clinical Research Institute, Newcastle upon Tyne, UK
| | - Graham Donen
- grid.17091.3e0000 0001 2288 9830Department of Anesthesiology, Pharmacology & Therapeutics, University of British Columbia (UBC), 217-2176 Health Sciences Mall, Vancouver, BC V6T 1Z3 Canada ,grid.416553.00000 0000 8589 2327UBC Centre for Heart Lung Innovation, St. Paul’s Hospital, Vancouver, Canada
| | - Dmitri Pechkovsky
- grid.17091.3e0000 0001 2288 9830Department of Anesthesiology, Pharmacology & Therapeutics, University of British Columbia (UBC), 217-2176 Health Sciences Mall, Vancouver, BC V6T 1Z3 Canada ,grid.416553.00000 0000 8589 2327UBC Centre for Heart Lung Innovation, St. Paul’s Hospital, Vancouver, Canada
| | - Volker Straub
- grid.1006.70000 0001 0462 7212Newcastle University Translational and Clinical Research Institute, Newcastle upon Tyne, UK
| | - Gordon A. Francis
- grid.416553.00000 0000 8589 2327UBC Centre for Heart Lung Innovation, St. Paul’s Hospital, Vancouver, Canada ,grid.17091.3e0000 0001 2288 9830Department of Medicine, UBC, Vancouver, Canada
| | - Pascal Bernatchez
- grid.17091.3e0000 0001 2288 9830Department of Anesthesiology, Pharmacology & Therapeutics, University of British Columbia (UBC), 217-2176 Health Sciences Mall, Vancouver, BC V6T 1Z3 Canada ,grid.416553.00000 0000 8589 2327UBC Centre for Heart Lung Innovation, St. Paul’s Hospital, Vancouver, Canada
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12
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Inhibition of the immunoproteasome modulates innate immunity to ameliorate muscle pathology of dysferlin-deficient BlAJ mice. Cell Death Dis 2022; 13:975. [PMID: 36402750 PMCID: PMC9675822 DOI: 10.1038/s41419-022-05416-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Revised: 11/03/2022] [Accepted: 11/07/2022] [Indexed: 11/21/2022]
Abstract
Muscle repair in dysferlinopathies is defective. Although macrophage (Mø)-rich infiltrates are prominent in damaged skeletal muscles of patients with dysferlinopathy, the contribution of the immune system to the disease pathology remains to be fully explored. Numbers of both pro-inflammatory M1 Mø and effector T cells are increased in muscle of dysferlin-deficient BlAJ mice. In addition, symptomatic BlAJ mice have increased muscle production of immunoproteasome. In vitro analyses using bone marrow-derived Mø of BlAJ mice show that immunoproteasome inhibition results in C3aR1 and C5aR1 downregulation and upregulation of M2-associated signaling. Administration of immunoproteasome inhibitor ONX-0914 to BlAJ mice rescues muscle function by reducing muscle infiltrates and fibro-adipogenesis. These findings reveal an important role of immunoproteasome in the progression of muscular dystrophy in BlAJ mouse and suggest that inhibition of immunoproteasome may produce therapeutic benefit in dysferlinopathy.
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13
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Lloyd EM, Hepburn MS, Li J, Mowla A, Hwang Y, Choi YS, Grounds MD, Kennedy BF. Three-dimensional mechanical characterization of murine skeletal muscle using quantitative micro-elastography. BIOMEDICAL OPTICS EXPRESS 2022; 13:5879-5899. [PMID: 36733728 PMCID: PMC9872891 DOI: 10.1364/boe.471062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Revised: 08/29/2022] [Accepted: 09/02/2022] [Indexed: 06/18/2023]
Abstract
Skeletal muscle function is governed by both the mechanical and structural properties of its constituent tissues, which are both modified by disease. Characterizing the mechanical properties of skeletal muscle tissue at an intermediate scale, i.e., between that of cells and organs, can provide insight into diseases such as muscular dystrophies. In this study, we use quantitative micro-elastography (QME) to characterize the micro-scale elasticity of ex vivo murine skeletal muscle in three-dimensions in whole muscles. To address the challenge of achieving high QME image quality with samples featuring uneven surfaces and geometry, we encapsulate the muscles in transparent hydrogels with flat surfaces. Using this method, we study aging and disease in quadriceps tissue by comparing normal wild-type (C57BL/6J) mice with dysferlin-deficient BLAJ mice, a model for the muscular dystrophy dysferlinopathy, at 3, 10, and 24 months of age (sample size of three per group). We observe a 77% decrease in elasticity at 24 months in dysferlin-deficient quadriceps compared to wild-type quadriceps.
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Affiliation(s)
- Erin M. Lloyd
- Department of Anatomy, Physiology and Human Biology, School of Human Sciences, The University of Western Australia, 35 Stirling Highway, Perth, Western Australia, 6009, Australia
- These authors contributed equally to this work
| | - Matt S. Hepburn
- BRITElab, Harry Perkins Institute of Medical Research, QEII Medical Centre, Nedlands, Western Australia, 6009, Australia and Centre for Medical Research, The University of Western Australia, Perth, Western Australia, 6009, Australia
- Department of Electrical, Electronic & Computer Engineering, School of Engineering, The University of Western Australia, 35, Stirling Highway, Perth, Western Australia, 6009, Australia
- These authors contributed equally to this work
| | - Jiayue Li
- BRITElab, Harry Perkins Institute of Medical Research, QEII Medical Centre, Nedlands, Western Australia, 6009, Australia and Centre for Medical Research, The University of Western Australia, Perth, Western Australia, 6009, Australia
- Department of Electrical, Electronic & Computer Engineering, School of Engineering, The University of Western Australia, 35, Stirling Highway, Perth, Western Australia, 6009, Australia
- Australian Research Council Centre for Personalised Therapeutics Technologies, Australia
| | - Alireza Mowla
- BRITElab, Harry Perkins Institute of Medical Research, QEII Medical Centre, Nedlands, Western Australia, 6009, Australia and Centre for Medical Research, The University of Western Australia, Perth, Western Australia, 6009, Australia
- Department of Electrical, Electronic & Computer Engineering, School of Engineering, The University of Western Australia, 35, Stirling Highway, Perth, Western Australia, 6009, Australia
| | - Yongsung Hwang
- Soonchunhyang Institute of Medi-Bio Science, Soonchunhyang University, Cheonan-si, Chungcheongnam-do, 31151, Republic of Korea
| | - Yu Suk Choi
- Department of Anatomy, Physiology and Human Biology, School of Human Sciences, The University of Western Australia, 35 Stirling Highway, Perth, Western Australia, 6009, Australia
| | - Miranda D. Grounds
- Department of Anatomy, Physiology and Human Biology, School of Human Sciences, The University of Western Australia, 35 Stirling Highway, Perth, Western Australia, 6009, Australia
| | - Brendan F. Kennedy
- BRITElab, Harry Perkins Institute of Medical Research, QEII Medical Centre, Nedlands, Western Australia, 6009, Australia and Centre for Medical Research, The University of Western Australia, Perth, Western Australia, 6009, Australia
- Department of Electrical, Electronic & Computer Engineering, School of Engineering, The University of Western Australia, 35, Stirling Highway, Perth, Western Australia, 6009, Australia
- Australian Research Council Centre for Personalised Therapeutics Technologies, Australia
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14
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Xu Z, Chen W, Wang L, You W, Wang Y, Wang Y, Zhao J, Shan T. UCP1 Knockin Induces Lipid Dynamics and Transcriptional Programs in the Skeletal Muscles of Pigs. Front Cell Dev Biol 2022; 9:808095. [PMID: 35096834 PMCID: PMC8790096 DOI: 10.3389/fcell.2021.808095] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Accepted: 12/07/2021] [Indexed: 02/02/2023] Open
Abstract
Uncoupling protein 1 (UCP1), the hallmark protein responsible for nonshivering thermogenesis in adipose tissue (especially brown adipose tissue) has regained researchers' attention in the context of metabolic disorders following the realization that UCP1 can be activated in adult humans and reconstituted in pigs. Both skeletal muscle and adipose tissue are highly dynamic tissues that interact at the metabolic and hormonal level in response to internal and external stress, and they coordinate in maintaining whole-body metabolic homeostasis. Here, we utilized lipidomics and transcriptomics to identify the altered lipid profiles and regulatory pathways in skeletal muscles from adipocyte-specific UCP1 knock-in (KI) pigs. UCP1 KI changed the contents of glycerophospholipids and acyl carnitines of skeletal muscles. Several metabolic regulatory pathways were more enriched in the UCP1 KI skeletal muscle. Comparison of the transcriptomes of adipose and skeletal muscle suggested that nervous system or chemokine signaling might account for the crosstalk between these two tissues in UCP1 KI pigs. Comparison of the lipid biomarkers from UCP1 KI pigs and other mammals suggested associations between UCP1 KI-induced metabolic alternations and metabolic and muscle dysfunction. Our study reveals the lipid dynamics and transcriptional programs in the skeletal muscle of UCP1 KI pigs and suggests that a network regulates metabolic homeostasis between skeletal muscle and adipose tissue.
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Affiliation(s)
- Ziye Xu
- College of Animal Sciences, Zhejiang University, Hangzhou, China.,Key Laboratory of Molecular Animal Nutrition, Ministry of Education, Zhejiang University, Hangzhou, China.,Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Zhejiang University, Hangzhou, China
| | - Wentao Chen
- College of Animal Sciences, Zhejiang University, Hangzhou, China.,Key Laboratory of Molecular Animal Nutrition, Ministry of Education, Zhejiang University, Hangzhou, China.,Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Zhejiang University, Hangzhou, China
| | - Liyi Wang
- College of Animal Sciences, Zhejiang University, Hangzhou, China.,Key Laboratory of Molecular Animal Nutrition, Ministry of Education, Zhejiang University, Hangzhou, China.,Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Zhejiang University, Hangzhou, China
| | - Wenjing You
- College of Animal Sciences, Zhejiang University, Hangzhou, China.,Key Laboratory of Molecular Animal Nutrition, Ministry of Education, Zhejiang University, Hangzhou, China.,Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Zhejiang University, Hangzhou, China
| | - Yanfang Wang
- State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Yizhen Wang
- College of Animal Sciences, Zhejiang University, Hangzhou, China.,Key Laboratory of Molecular Animal Nutrition, Ministry of Education, Zhejiang University, Hangzhou, China
| | - Jianguo Zhao
- Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Tizhong Shan
- College of Animal Sciences, Zhejiang University, Hangzhou, China.,Key Laboratory of Molecular Animal Nutrition, Ministry of Education, Zhejiang University, Hangzhou, China.,Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Zhejiang University, Hangzhou, China
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15
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White Z, Theret M, Milad N, Tung LW, Chen WWH, Sirois MG, Rossi F, Bernatchez P. Cholesterol absorption blocker ezetimibe prevents muscle wasting in severe dysferlin-deficient and mdx mice. J Cachexia Sarcopenia Muscle 2022; 13:544-560. [PMID: 34927367 PMCID: PMC8818667 DOI: 10.1002/jcsm.12879] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/04/2021] [Revised: 10/26/2021] [Accepted: 10/29/2021] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND Muscular dystrophy (MD) causes muscle wasting and is often lethal in patients due to a lack of proven therapies. In contrast, mouse models of MD are notoriously mild. We have previously shown severe human-like muscle pathology in mdx [Duchenne MD (DMD)] and dysferlin-deficient limb-girdle MD type 2B (LGMD2B) mice by inactivating the gene encoding for apolipoprotein E (ApoE), a lipid transporter synthesized by the liver, brain and adipocytes to regulate lipid and fat metabolism. Having recently established that human DMD is a novel type of primary genetic dyslipidaemia with elevated cholesterol, we sought to determine whether cholesterol could exacerbate the muscle wasting process observed in severe rodent MD. METHODS Severe mdx and dysferlin knock-out mice lacking ApoE were treated with ezetimibe (15 mg/kg/day), a clinically approved drug exhibiting few pleiotropic effects. In separate studies, dietary cholesterol was raised (from 0.2% to 2% cholesterol) in combination with experimental micro-injury and direct cholesterol injection assays. Muscles were assessed histologically for changes in collagen and adipocyte infiltration and both transcriptomic and cellular changes by RNA-seq and fluorescence-activated cell sorting analysis. RESULTS Treatment of severe DMD and LGMD2B mice with ezetimibe completely prevented clinical signs of ambulatory dysfunction (0% incidence vs. 33% for vehicle treatment; P < 0.05). Histological analyses revealed that ezetimibe-reduced fibro-fatty infiltration up to 84% and 63% in severely affected triceps (P ≤ 0.0001) and gastrocnemius (P ≤ 0.003) muscles, resulting in a respective 1.9-fold and 2.2-fold retention of healthy myofibre area (P ≤ 0.0001). Additionally, raising dietary cholesterol and thus concentrations of plasma low-density lipoprotein-associated cholesterol (by 250%; P < 0.0001) reduced overall survivability (by 100%; P < 0.001) and worsened muscle damage in the LGMD2B triceps by 767% (P < 0.03). Micro-pin-induced mechanical injury in LGMD2B mice fed a high cholesterol diet exacerbated muscle damage by 425% (P < 0.03) and increased macrophage recruitment (by 98%; P = 0.03) compared with those injured on a chow diet. Parallel RNA-seq analyses revealed that injury in cholesterol-fed mice also modulated the expression of 3671 transcripts (1953 up-regulated), with fibrogenic, inflammatory and programmed cell death-associated pathways among the most enriched. Mice lacking dysferlin also displayed heightened muscle necrosis (by 123%; P < 0.0001) following a direct intramuscular injection of cholesterol compared with control mice. CONCLUSIONS Cholesterol exacerbates rodent MD. Specific inhibition of cholesterol absorption with ezetimibe may safely attenuate human MD severity and delay death.
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Affiliation(s)
- Zoe White
- Department of Anesthesiology, Pharmacology & Therapeutics, University of British Columbia (UBC), Vancouver, BC, Canada.,UBC Centre for Heart Lung Innovation, St. Paul's Hospital, Vancouver, BC, Canada
| | - Marine Theret
- School of Biomedical Engineering, Department of Medical Genetics, University of British Columbia (UBC), Vancouver, BC, Canada
| | - Nadia Milad
- Department of Anesthesiology, Pharmacology & Therapeutics, University of British Columbia (UBC), Vancouver, BC, Canada.,UBC Centre for Heart Lung Innovation, St. Paul's Hospital, Vancouver, BC, Canada
| | - Lin Wei Tung
- School of Biomedical Engineering, Department of Medical Genetics, University of British Columbia (UBC), Vancouver, BC, Canada
| | - William Wei-Han Chen
- Department of Anesthesiology, Pharmacology & Therapeutics, University of British Columbia (UBC), Vancouver, BC, Canada.,UBC Centre for Heart Lung Innovation, St. Paul's Hospital, Vancouver, BC, Canada
| | - Martin G Sirois
- Montreal Heart Institute, Department of Pharmacology and Physiology, Université de Montréal, Montreal, QC, Canada
| | - Fabio Rossi
- School of Biomedical Engineering, Department of Medical Genetics, University of British Columbia (UBC), Vancouver, BC, Canada
| | - Pascal Bernatchez
- Department of Anesthesiology, Pharmacology & Therapeutics, University of British Columbia (UBC), Vancouver, BC, Canada.,UBC Centre for Heart Lung Innovation, St. Paul's Hospital, Vancouver, BC, Canada
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16
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Tominaga K, Tominaga N, Williams EO, Rufibach L, Schöwel V, Spuler S, Viswanathan M, Guarente LP. 4-Phenylbutyrate restores localization and membrane repair to human dysferlin mutations. iScience 2022; 25:103667. [PMID: 35028538 PMCID: PMC8741482 DOI: 10.1016/j.isci.2021.103667] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Revised: 10/06/2021] [Accepted: 12/15/2021] [Indexed: 10/29/2022] Open
Abstract
Dysferlinopathies are muscular dystrophies caused by recessive loss-of-function mutations in dysferlin (DYSF), a membrane protein involved in skeletal muscle membrane repair. We describe a cell-based assay in which human DYSF proteins bearing missense mutations are quantitatively assayed for membrane localization by flow cytometry and identified 64 localization-defective DYSF mutations. Using this platform, we show that the clinically approved drug 4-phenylbutryric acid (4-PBA) partially restores membrane localization to 25 mutations, as well as membrane repair to cultured myotubes expressing 2 different mutations. Two-day oral administration of 4-PBA to mice homozygous for one of these mutations restored myofiber membrane repair. 4-PBA may hold therapeutic potential for treating a subset of humans with muscular dystrophy due to dysferlin deficiency.
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Affiliation(s)
- Kana Tominaga
- Paul F. Glenn Center for Biology of Aging, Department of Biology, Koch Institute, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- Department of Pathology and Oncology, Juntendo University School of Medicine, 2-1-1 Hongo, Bunkyoku, Tokyo 113-8421, Japan
| | - Naoomi Tominaga
- Paul F. Glenn Center for Biology of Aging, Department of Biology, Koch Institute, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Eric O. Williams
- Paul F. Glenn Center for Biology of Aging, Department of Biology, Koch Institute, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- Fitchburg State University, School of Heath and Natural Sciences, Antonucci Science Complex 235, Fitchburg, MA 01420, USA
| | - Laura Rufibach
- Jain Foundation, 9706 4th Avenue NE, Suite 101, Seattle, WA 98115, USA
| | - Verena Schöwel
- Muscle Research Unit, Experimental and Clinical Research Center (ECRC), a joint cooperation of Charité Universitätsmedizin Berlin and Max-Delbrück Center for Molecular Medicine, Berlin, Germany
| | - Simone Spuler
- Muscle Research Unit, Experimental and Clinical Research Center (ECRC), a joint cooperation of Charité Universitätsmedizin Berlin and Max-Delbrück Center for Molecular Medicine, Berlin, Germany
| | - Mohan Viswanathan
- Paul F. Glenn Center for Biology of Aging, Department of Biology, Koch Institute, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Leonard P. Guarente
- Paul F. Glenn Center for Biology of Aging, Department of Biology, Koch Institute, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
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17
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Therapeutic Benefit of Galectin-1: Beyond Membrane Repair, a Multifaceted Approach to LGMD2B. Cells 2021; 10:cells10113210. [PMID: 34831431 PMCID: PMC8621416 DOI: 10.3390/cells10113210] [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] [Received: 09/30/2021] [Revised: 11/11/2021] [Accepted: 11/12/2021] [Indexed: 11/21/2022] Open
Abstract
Two of the main pathologies characterizing dysferlinopathies are disrupted muscle membrane repair and chronic inflammation, which lead to symptoms of muscle weakness and wasting. Here, we used recombinant human Galectin-1 (rHsGal-1) as a therapeutic for LGMD2B mouse and human models. Various redox and multimerization states of Gal-1 show that rHsGal-1 is the most effective form in both increasing muscle repair and decreasing inflammation, due to its monomer-dimer equilibrium. Dose-response testing shows an effective 25-fold safety profile between 0.54 and 13.5 mg/kg rHsGal-1 in Bla/J mice. Mice treated weekly with rHsGal-1 showed downregulation of canonical NF-κB inflammation markers, decreased muscle fat deposition, upregulated anti-inflammatory cytokines, increased membrane repair, and increased functional movement compared to non-treated mice. Gal-1 treatment also resulted in a positive self-upregulation loop of increased endogenous Gal-1 expression independent of NF-κB activation. A similar reduction in disease pathologies in patient-derived human cells demonstrates the therapeutic potential of Gal-1 in LGMD2B patients.
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Phospholipids: Identification and Implication in Muscle Pathophysiology. Int J Mol Sci 2021; 22:ijms22158176. [PMID: 34360941 PMCID: PMC8347011 DOI: 10.3390/ijms22158176] [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: 07/15/2021] [Revised: 07/24/2021] [Accepted: 07/26/2021] [Indexed: 12/29/2022] Open
Abstract
Phospholipids (PLs) are amphiphilic molecules that were essential for life to become cellular. PLs have not only a key role in compartmentation as they are the main components of membrane, but they are also involved in cell signaling, cell metabolism, and even cell pathophysiology. Considered for a long time to simply be structural elements of membranes, phospholipids are increasingly being viewed as sensors of their environment and regulators of many metabolic processes. After presenting their main characteristics, we expose the increasing methods of PL detection and identification that help to understand their key role in life processes. Interest and importance of PL homeostasis is growing as pathogenic variants in genes involved in PL biosynthesis and/or remodeling are linked to human diseases. We here review diseases that involve deregulation of PL homeostasis and present a predominantly muscular phenotype.
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Alves FM, Kysenius K, Caldow MK, Hardee JP, Crouch PJ, Ayton S, Bush AI, Lynch GS, Koopman R. Iron accumulation in skeletal muscles of old mice is associated with impaired regeneration after ischaemia-reperfusion damage. J Cachexia Sarcopenia Muscle 2021; 12:476-492. [PMID: 33665974 PMCID: PMC8061412 DOI: 10.1002/jcsm.12685] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Revised: 11/08/2020] [Accepted: 01/22/2021] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND Oxidative stress is implicated in the insidious loss of muscle mass and strength that occurs with age. However, few studies have investigated the role of iron, which is elevated during ageing, in age-related muscle wasting and blunted repair after injury. We hypothesized that iron accumulation leads to membrane lipid peroxidation, muscle wasting, increased susceptibility to injury, and impaired muscle regeneration. METHODS To examine the role of iron in age-related muscle atrophy, we compared the skeletal muscles of 3-month-old with 22- to 24-month-old 129SvEv FVBM mice. We assessed iron distribution and total elemental iron using laser ablation inductively coupled plasma mass spectrometry and Perls' stain on skeletal muscle cross-sections. In addition, old mice underwent ischaemia-reperfusion (IR) injury (90 min ischaemia), and muscle regeneration was assessed 14 days after injury. Immunoblotting was used to determine lipid peroxidation (4HNE) and iron-related proteins. To determine whether muscle iron content can be altered, old mice were treated with deferiprone (DFP) in the drinking water, and we assessed its effects on muscle regeneration after injury. RESULTS We observed a significant increase in total elemental iron (+43%, P < 0.05) and lipid peroxidation (4HNE: +76%, P < 0.05) in tibialis anterior muscles of old mice. Iron was further increased after injury (adult: +81%, old: +135%, P < 0.05) and associated with increased lipid peroxidation (+41%, P < 0.05). Administration of DFP did not impact iron or measures of lipid peroxidation in skeletal muscle or modulate muscle mass. Increased muscle iron concentration and lipid peroxidation were associated with less efficient regeneration, evident from the smaller fibres in cross-sections of tibialis anterior muscles (-24%, P < 0.05) and an increased percentage of fibres with centralized nuclei (+4124%, P < 0.05) in muscles of old compared with adult mice. Administration of DFP lowered iron after IR injury (PRE: -32%, P < 0.05 and POST: -41%, P < 0.05), but did not translate to structural improvements. CONCLUSIONS Muscles from old mice have increased iron levels, which are associated with increased lipid peroxidation, increased susceptibility to IR injury, and impaired muscle regeneration. Our results suggest that iron is involved in effective muscle regeneration, highlighting the importance of iron homeostasis in muscle atrophy and muscle repair.
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Affiliation(s)
- Francesca M Alves
- Centre for Muscle Research, Department of Anatomy and Physiology, The University of Melbourne, Parkville, Victoria, Australia.,Melbourne Dementia Research Centre, The Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Parkville, Victoria, Australia
| | - Kai Kysenius
- Department of Pharmacology and Therapeutics, The University of Melbourne, Parkville, Victoria, Australia
| | - Marissa K Caldow
- Centre for Muscle Research, Department of Anatomy and Physiology, The University of Melbourne, Parkville, Victoria, Australia
| | - Justin P Hardee
- Centre for Muscle Research, Department of Anatomy and Physiology, The University of Melbourne, Parkville, Victoria, Australia
| | - Peter J Crouch
- Department of Pharmacology and Therapeutics, The University of Melbourne, Parkville, Victoria, Australia
| | - Scott Ayton
- Melbourne Dementia Research Centre, The Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Parkville, Victoria, Australia
| | - Ashley I Bush
- Melbourne Dementia Research Centre, The Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Parkville, Victoria, Australia
| | - Gordon S Lynch
- Centre for Muscle Research, Department of Anatomy and Physiology, The University of Melbourne, Parkville, Victoria, Australia
| | - René Koopman
- Centre for Muscle Research, Department of Anatomy and Physiology, The University of Melbourne, Parkville, Victoria, Australia
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Li L, Jing Z, Cheng L, Liu W, Wang H, Xu Y, Zheng X, Yu X, Liu S. Compound heterozygous DYSF variants causing limb-girdle muscular dystrophy type 2B in a Chinese family. J Gene Med 2020; 22:e3272. [PMID: 32889728 DOI: 10.1002/jgm.3272] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2020] [Revised: 08/22/2020] [Accepted: 08/29/2020] [Indexed: 11/11/2022] Open
Abstract
BACKGROUND The dysferlin gene or the DYSF gene encodes the Ca2+ -dependent phospholipid-binding protein dysferlin, which belongs to the ferlin family and is associated with muscle membrane regeneration and repair. Variants in the DYSF gene are responsible for limb-girdle muscular dystrophy type 2B (LGMD2B), also called limb-girdle muscular dystrophy recessive 2 (LGMDR2), a rare subtype of muscular dystrophy involving progressive muscle weakness and atrophy. The present study aimed to identify the variants responsible for the clinical symptoms of a Chinese patient with limb girdle muscular dystrophies (LGMDs) and to explore the genotype-phenotype associations of LGMD2B. METHODS A series of clinical examinations, including blood tests, magnetic resonance imaging scans for the lower legs, electromyography and muscle biopsy, was performed on the proband diagnosed with muscular dystrophies. Whole exome sequencing was conducted to detect the causative variants, followed by Sanger sequencing to validate these variants. RESULTS We identified two compound heterozygous variants in the DYSF gene, c.1058 T>C, p.(Leu353Pro) in exon 12 and c.1461C>A/p.Cys487* in exon 16 in this proband, which were inherited from the father and mother, respectively. In silico analysis for these variants revealed deleterious results by PolyPhen-2 (Polymorphism Phenotyping v2; http://genetics.bwh.harvard.edu/pph2), SIFT (Sorting Intolerant From Tolerant; https://sift.bii.a-star.edu.sg), PROVEAN (Protein Variation Effect Analyzer; http://provean.jcvi.org/seq_submit.php) and MutationTaster (http://www.mutationtaster.org). In addition, the two compound heterozygous variants in the proband were absent in 100 control individuals who had an identical ethnic origin and were from the same region, suggesting that these variants may be the pathogenic variants responsible for the LGMD2B phenotypes for this proband. CONCLUSIONS The present study broadens our understanding of the mutational spectrum of the DYSF gene, which provides a deep insight into the pathogenesis of LGMDs and accelerates the development of a prenatal diagnosis.
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Affiliation(s)
- Liangshan Li
- Medical Genetic Department, The Affiliated Hospital of Qingdao University, Qingdao, China.,Department of Clinical Laboratory, Medical College of Qingdao University, Qingdao, China
| | - Zhongcui Jing
- Department of Blood Transfusion, The Affiliated Hospital of Qingdao University, Qingdao, China
| | - Lei Cheng
- Department of Neurosurgery, The Affiliated Hospital of Qingdao University, Qingdao, China
| | - Wenmiao Liu
- Medical Genetic Department, The Affiliated Hospital of Qingdao University, Qingdao, China
| | - Haiyan Wang
- Department of Blood Transfusion, The Affiliated Hospital of Qingdao University, Qingdao, China
| | - Yinglei Xu
- Medical Genetic Department, The Affiliated Hospital of Qingdao University, Qingdao, China
| | - Xueping Zheng
- Department of Neurology, The Affiliated Hospital of Qingdao University, Qingdao, China
| | - Xiaoling Yu
- Department of Pathophysiology, Medical College of Qingdao University, Qingdao, China
| | - Shiguo Liu
- Medical Genetic Department, The Affiliated Hospital of Qingdao University, Qingdao, China
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Blockade of Hemichannels Normalizes the Differentiation Fate of Myoblasts and Features of Skeletal Muscles from Dysferlin-Deficient Mice. Int J Mol Sci 2020; 21:ijms21176025. [PMID: 32825681 PMCID: PMC7503700 DOI: 10.3390/ijms21176025] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2020] [Revised: 08/12/2020] [Accepted: 08/17/2020] [Indexed: 01/18/2023] Open
Abstract
Dysferlinopathies are muscle dystrophies caused by mutations in the gene encoding dysferlin, a relevant protein for membrane repair and trafficking. These diseases are untreatable, possibly due to the poor knowledge of relevant molecular targets. Previously, we have shown that human myofibers from patient biopsies as well as myotubes derived from immortalized human myoblasts carrying a mutated form of dysferlin express connexin proteins, but their relevance in myoblasts fate and function remained unknown. In the present work, we found that numerous myoblasts bearing a mutated dysferlin when induced to acquire myogenic commitment express PPARγ, revealing adipogenic instead of myogenic commitment. These cell cultures presented many mononucleated cells with fat accumulation and within 48 h of differentiation formed fewer multinucleated cells. In contrast, dysferlin deficient myoblasts treated with boldine, a connexin hemichannels blocker, neither expressed PPARγ, nor accumulated fat and formed similar amount of multinucleated cells as wild type precursor cells. We recently demonstrated that myofibers of skeletal muscles from blAJ mice (an animal model of dysferlinopathies) express three connexins (Cx39, Cx43, and Cx45) that form functional hemichannels (HCs) in the sarcolemma. In symptomatic blAJ mice, we now show that eight-week treatment with a daily dose of boldine showed a progressive recovery of motor activity reaching normality. At the end of this treatment, skeletal muscles were comparable to those of wild type mice and presented normal CK activity in serum. Myofibers of boldine-treated blAJ mice also showed strong dysferlin-like immunoreactivity. These findings reveal that muscle dysfunction results from a pathophysiologic mechanism triggered by mutated dysferlin and downstream connexin hemichannels expressed de novo lead to a drastic reduction of myogenesis and favor muscle damage. Thus, boldine could represent a therapeutic opportunity to treat dysfernilopathies.
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Kravtsova VV, Bouzinova EV, Chibalin AV, Matchkov VV, Krivoi II. Isoform-specific Na,K-ATPase and membrane cholesterol remodeling in motor endplates in distinct mouse models of myodystrophy. Am J Physiol Cell Physiol 2020; 318:C1030-C1041. [PMID: 32293933 DOI: 10.1152/ajpcell.00453.2019] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Na,K-ATPase is a membrane transporter that is critically important for skeletal muscle function. Mdx and Bla/J mice are the experimental models of Duchenne muscular dystrophy and dysferlinopathy that are known to differ in the molecular mechanism of the pathology. This study examines the function of α1- and α2-Na,K-ATPase isozymes in respiratory diaphragm and postural soleus muscles from mdx and Bla/J mice compared with control С57Bl/6 mice. In diaphragm muscles, the motor endplate structure was severely disturbed (manifested by defragmentation) in mdx mice only. The endplate membrane of both Bla/J and mdx mice was depolarized due to specific loss of the α2-Na,K-ATPase electrogenic activity and its decreased membrane abundance. Total FXYD1 subunit (modulates Na,K-ATPase activity) abundance was decreased in both mouse models. However, the α2-Na,K-ATPase protein content as well as mRNA expression were specifically and significantly reduced only in mdx mice. The endplate membrane cholesterol redistribution was most pronounced in mdx mice. Soleus muscles from Bla/J and mdx mice demonstrated reduction of the α2-Na,K-ATPase membrane abundance and mRNA expression similar to the diaphragm muscles. In contrast to diaphragm, the α2-Na,K-ATPase protein content was altered in both Bla/J and mdx mice; membrane cholesterol re-distribution was not observed. Thus, the α2-Na,K-ATPase is altered in both Bla/J and mdx mouse models of chronic muscle pathology. However, despite some similarities, the α2-Na,K-ATPase and cholesterol abnormalities are more pronounced in mdx mice.
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Affiliation(s)
- Violetta V Kravtsova
- Department of General Physiology, St. Petersburg State University, St. Petersburg, Russia
| | | | | | | | - Igor I Krivoi
- Department of General Physiology, St. Petersburg State University, St. Petersburg, Russia
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van Putten M, Lloyd EM, de Greef JC, Raz V, Willmann R, Grounds MD. Mouse models for muscular dystrophies: an overview. Dis Model Mech 2020; 13:dmm043562. [PMID: 32224495 PMCID: PMC7044454 DOI: 10.1242/dmm.043562] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Muscular dystrophies (MDs) encompass a wide variety of inherited disorders that are characterized by loss of muscle tissue associated with a progressive reduction in muscle function. With a cure lacking for MDs, preclinical developments of therapeutic approaches depend on well-characterized animal models that recapitulate the specific pathology in patients. The mouse is the most widely and extensively used model for MDs, and it has played a key role in our understanding of the molecular mechanisms underlying MD pathogenesis. This has enabled the development of therapeutic strategies. Owing to advancements in genetic engineering, a wide variety of mouse models are available for the majority of MDs. Here, we summarize the characteristics of the most commonly used mouse models for a subset of highly studied MDs, collated into a table. Together with references to key publications describing these models, this brief but detailed overview would be useful for those interested in, or working with, mouse models of MD.
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Affiliation(s)
- Maaike van Putten
- Leiden University Medical Center, Department of Human Genetics, Leiden, 2333 ZA, The Netherlands
| | - Erin M Lloyd
- The University of Western Australia, School of Human Sciences, Perth 6009, Australia
| | - Jessica C de Greef
- Leiden University Medical Center, Department of Human Genetics, Leiden, 2333 ZA, The Netherlands
| | - Vered Raz
- Leiden University Medical Center, Department of Human Genetics, Leiden, 2333 ZA, The Netherlands
| | | | - Miranda D Grounds
- The University of Western Australia, School of Human Sciences, Perth 6009, Australia
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