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Aringhieri G, Astrea G, Marfisi D, Fanni SC, Marinella G, Pasquariello R, Ricci G, Sansone F, Sperti M, Tonacci A, Torri F, Matà S, Siciliano G, Neri E, Santorelli FM, Conte R. Convolutional Neural Network-Based Automated Segmentation of Skeletal Muscle and Subcutaneous Adipose Tissue on Thigh MRI in Muscular Dystrophy Patients. J Funct Morphol Kinesiol 2024; 9:123. [PMID: 39051284 PMCID: PMC11270263 DOI: 10.3390/jfmk9030123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/18/2024] [Revised: 07/08/2024] [Accepted: 07/08/2024] [Indexed: 07/27/2024] Open
Abstract
We aim to develop a deep learning-based algorithm for automated segmentation of thigh muscles and subcutaneous adipose tissue (SAT) from T1-weighted muscle MRIs from patients affected by muscular dystrophies (MDs). From March 2019 to February 2022, adult and pediatric patients affected by MDs were enrolled from Azienda Ospedaliera Universitaria Pisana, Pisa, Italy (Institution 1) and the IRCCS Stella Maris Foundation, Calambrone-Pisa, Italy (Institution 2), respectively. All patients underwent a bilateral thighs MRI including an axial T1 weighted in- and out-of-phase (dual-echo). Both muscles and SAT were manually and separately segmented on out-of-phase image sets by a radiologist with 6 years of experience in musculoskeletal imaging. A U-Net1 and U-Net3 were built to automatically segment the SAT, all the thigh muscles together and the three muscular compartments separately. The dataset was randomly split into the on train, validation, and test set. The segmentation performance was assessed through the Dice similarity coefficient (DSC). The final cohort included 23 patients. The estimated DSC for U-Net1 was 96.8%, 95.3%, and 95.6% on train, validation, and test set, respectively, while the estimated accuracy for U-Net3 was 94.1%, 92.9%, and 93.9%. Both of the U-Nets achieved a median DSC of 0.95 for SAT segmentation. The U-Net1 and the U-Net3 achieved an optimal agreement with manual segmentation for the automatic segmentation. The so-developed neural networks have the potential to automatically segment thigh muscles and SAT in patients affected by MDs.
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Affiliation(s)
- Giacomo Aringhieri
- Department of Translational Research and New Technology in Medicine and Surgery, Academic Radiology, University of Pisa, 56126 Pisa, Italy; (G.A.); (E.N.)
| | - Guja Astrea
- Department of Developmental Neuroscience, IRCCS Fondazione Stella Maris, 56128 Pisa, Italy; (G.A.); (G.M.); (R.P.); (F.M.S.)
| | - Daniela Marfisi
- Institute of Clinical Physiology, National Research Council of Italy (IFC-CNR), 56124 Pisa, Italy; (D.M.); (F.S.); (A.T.); (R.C.)
| | - Salvatore Claudio Fanni
- Department of Translational Research and New Technology in Medicine and Surgery, Academic Radiology, University of Pisa, 56126 Pisa, Italy; (G.A.); (E.N.)
| | - Gemma Marinella
- Department of Developmental Neuroscience, IRCCS Fondazione Stella Maris, 56128 Pisa, Italy; (G.A.); (G.M.); (R.P.); (F.M.S.)
| | - Rosa Pasquariello
- Department of Developmental Neuroscience, IRCCS Fondazione Stella Maris, 56128 Pisa, Italy; (G.A.); (G.M.); (R.P.); (F.M.S.)
| | - Giulia Ricci
- Department of Clinical and Experimental Medicine, University of Pisa, 56126 Pisa, Italy; (G.R.); (F.T.); (G.S.)
| | - Francesco Sansone
- Institute of Clinical Physiology, National Research Council of Italy (IFC-CNR), 56124 Pisa, Italy; (D.M.); (F.S.); (A.T.); (R.C.)
| | - Martina Sperti
- Department of Neurology, Careggi University Hospital, University of Florence, 50134 Florence, Italy;
| | - Alessandro Tonacci
- Institute of Clinical Physiology, National Research Council of Italy (IFC-CNR), 56124 Pisa, Italy; (D.M.); (F.S.); (A.T.); (R.C.)
| | - Francesca Torri
- Department of Clinical and Experimental Medicine, University of Pisa, 56126 Pisa, Italy; (G.R.); (F.T.); (G.S.)
| | - Sabrina Matà
- SOD Neurologia 1, Dipartimento Neuromuscolo-Scheletrico e Degli Organi di Senso, Azienda Ospedaliera Universitaria Careggi, 50134 Florence, Italy;
| | - Gabriele Siciliano
- Department of Clinical and Experimental Medicine, University of Pisa, 56126 Pisa, Italy; (G.R.); (F.T.); (G.S.)
| | - Emanuele Neri
- Department of Translational Research and New Technology in Medicine and Surgery, Academic Radiology, University of Pisa, 56126 Pisa, Italy; (G.A.); (E.N.)
| | - Filippo Maria Santorelli
- Department of Developmental Neuroscience, IRCCS Fondazione Stella Maris, 56128 Pisa, Italy; (G.A.); (G.M.); (R.P.); (F.M.S.)
| | - Raffaele Conte
- Institute of Clinical Physiology, National Research Council of Italy (IFC-CNR), 56124 Pisa, Italy; (D.M.); (F.S.); (A.T.); (R.C.)
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2
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Collins BC, Shapiro JB, Scheib MM, Musci RV, Verma M, Kardon G. Three-dimensional imaging studies in mice identify cellular dynamics of skeletal muscle regeneration. Dev Cell 2024; 59:1457-1474.e5. [PMID: 38569550 PMCID: PMC11153043 DOI: 10.1016/j.devcel.2024.03.017] [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: 04/25/2023] [Revised: 12/06/2023] [Accepted: 03/08/2024] [Indexed: 04/05/2024]
Abstract
The function of many organs, including skeletal muscle, depends on their three-dimensional structure. Muscle regeneration therefore requires not only reestablishment of myofibers but also restoration of tissue architecture. Resident muscle stem cells (SCs) are essential for regeneration, but how SCs regenerate muscle architecture is largely unknown. We address this problem using genetic labeling of mouse SCs and whole-mount imaging to reconstruct, in three dimensions, muscle regeneration. Unexpectedly, we found that myofibers form via two distinct phases of fusion and the residual basement membrane of necrotic myofibers is critical for promoting fusion and orienting regenerated myofibers. Furthermore, the centralized myonuclei characteristic of regenerated myofibers are associated with myofibrillogenesis and endure months post injury. Finally, we elucidate two cellular mechanisms for the formation of branched myofibers, a pathology characteristic of diseased muscle. We provide a synthesis of the cellular events of regeneration and show that these differ from those used during development.
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Affiliation(s)
- Brittany C Collins
- Department of Human Genetics, University of Utah, Salt Lake City, UT, USA
| | - Jacob B Shapiro
- Department of Human Genetics, University of Utah, Salt Lake City, UT, USA
| | - Mya M Scheib
- Department of Human Genetics, University of Utah, Salt Lake City, UT, USA
| | - Robert V Musci
- Department of Human Genetics, University of Utah, Salt Lake City, UT, USA
| | - Mayank Verma
- Department of Pediatrics, Division of Neurology, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Gabrielle Kardon
- Department of Human Genetics, University of Utah, Salt Lake City, UT, USA.
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Kaspute G, Arunagiri BD, Alexander R, Ramanavicius A, Samukaite-Bubniene U. Development of Essential Oil Delivery Systems by 'Click Chemistry' Methods: Possible Ways to Manage Duchenne Muscular Dystrophy. MATERIALS (BASEL, SWITZERLAND) 2023; 16:6537. [PMID: 37834674 PMCID: PMC10573547 DOI: 10.3390/ma16196537] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Revised: 09/25/2023] [Accepted: 09/28/2023] [Indexed: 10/15/2023]
Abstract
Recently, rare diseases have received attention due to the need for improvement in diagnosed patients' and their families' lives. Duchenne muscular dystrophy (DMD) is a rare, severe, progressive, muscle-wasting disease. Today, the therapeutic standard for treating DMD is corticosteroids, which cause serious adverse side effects. Nutraceuticals, e.g., herbal extracts or essential oils (EOs), are possible active substances to develop new drug delivery systems to improve DMD patients' lives. New drug delivery systems lead to new drug effects, improved safety and accuracy, and new therapies for rare diseases. Herbal extracts and EOs combined with click chemistry can lead to the development of safer treatments for DMD. In this review, we focus on the need for novel drug delivery systems using EOs as the therapy for DMD and the potential use of click chemistry for drug delivery systems. New EO complex drug delivery systems may offer a new approach for improving muscle conditions and mental health issues associated with DMD. However, further research should identify the potential of these systems in the context of DMD. In this review, we discuss possibilities for applying EOs to DMD before implementing expensive research in a theoretical way.
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Affiliation(s)
- Greta Kaspute
- Department of Nanotechnology, State Research Institute Center for Physical Sciences and Technology (FTMC), Sauletekis av. 3, LT-10257 Vilnius, Lithuania;
- Department of Physical Chemistry, Institute of Chemistry, Faculty of Chemistry and Geosciences, Vilnius University, Naugarduko Str. 24, LT-03225 Vilnius, Lithuania; (B.D.A.); (R.A.)
| | - Bharani Dharan Arunagiri
- Department of Physical Chemistry, Institute of Chemistry, Faculty of Chemistry and Geosciences, Vilnius University, Naugarduko Str. 24, LT-03225 Vilnius, Lithuania; (B.D.A.); (R.A.)
| | - Rakshana Alexander
- Department of Physical Chemistry, Institute of Chemistry, Faculty of Chemistry and Geosciences, Vilnius University, Naugarduko Str. 24, LT-03225 Vilnius, Lithuania; (B.D.A.); (R.A.)
| | - Arunas Ramanavicius
- Department of Nanotechnology, State Research Institute Center for Physical Sciences and Technology (FTMC), Sauletekis av. 3, LT-10257 Vilnius, Lithuania;
- Department of Physical Chemistry, Institute of Chemistry, Faculty of Chemistry and Geosciences, Vilnius University, Naugarduko Str. 24, LT-03225 Vilnius, Lithuania; (B.D.A.); (R.A.)
| | - Urte Samukaite-Bubniene
- Department of Nanotechnology, State Research Institute Center for Physical Sciences and Technology (FTMC), Sauletekis av. 3, LT-10257 Vilnius, Lithuania;
- Department of Physical Chemistry, Institute of Chemistry, Faculty of Chemistry and Geosciences, Vilnius University, Naugarduko Str. 24, LT-03225 Vilnius, Lithuania; (B.D.A.); (R.A.)
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Gineste C, Youhanna S, Vorrink SU, Henriksson S, Hernández A, Cheng AJ, Chaillou T, Buttgereit A, Schneidereit D, Friedrich O, Hultenby K, Bruton JD, Ivarsson N, Sandblad L, Lauschke VM, Westerblad H. Enzymatically dissociated muscle fibers display rapid dedifferentiation and impaired mitochondrial calcium control. iScience 2022; 25:105654. [PMID: 36479146 PMCID: PMC9720020 DOI: 10.1016/j.isci.2022.105654] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Revised: 07/19/2022] [Accepted: 11/18/2022] [Indexed: 11/23/2022] Open
Abstract
Cells rapidly lose their physiological phenotype upon disruption of their extracellular matrix (ECM)-intracellular cytoskeleton interactions. By comparing adult mouse skeletal muscle fibers, isolated either by mechanical dissection or by collagenase-induced ECM digestion, we investigated acute effects of ECM disruption on cellular and mitochondrial morphology, transcriptomic signatures, and Ca2+ handling. RNA-sequencing showed striking differences in gene expression patterns between the two isolation methods with enzymatically dissociated fibers resembling myopathic phenotypes. Mitochondrial appearance was grossly similar in the two groups, but 3D electron microscopy revealed shorter and less branched mitochondria following enzymatic dissociation. Repeated contractions resulted in a prolonged mitochondrial Ca2+ accumulation in enzymatically dissociated fibers, which was partially prevented by cyclophilin inhibitors. Of importance, muscle fibers of mice with severe mitochondrial myopathy show pathognomonic mitochondrial Ca2+ accumulation during repeated contractions and this accumulation was concealed with enzymatic dissociation, making this an ambiguous method in studies of native intracellular Ca2+ fluxes.
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Affiliation(s)
- Charlotte Gineste
- Department of Physiology and Pharmacology, Karolinska Institutet, 171 77 Stockholm, Sweden
| | - Sonia Youhanna
- Department of Physiology and Pharmacology, Karolinska Institutet, 171 77 Stockholm, Sweden
| | - Sabine U. Vorrink
- Department of Physiology and Pharmacology, Karolinska Institutet, 171 77 Stockholm, Sweden
| | - Sara Henriksson
- Umeå Core Facility for Electron Microscopy, Department of Chemistry, Umeå University, 901 87 Umeå, Sweden
| | - Andrés Hernández
- Department of Physiology and Pharmacology, Karolinska Institutet, 171 77 Stockholm, Sweden
| | - Arthur J. Cheng
- Department of Physiology and Pharmacology, Karolinska Institutet, 171 77 Stockholm, Sweden
| | - Thomas Chaillou
- Department of Physiology and Pharmacology, Karolinska Institutet, 171 77 Stockholm, Sweden
| | - Andreas Buttgereit
- Institute of Medical Biotechnology, Department of Chemical and Biological Engineering, Friedrich-Alexander University of Erlangen-Nürnberg, 91052 Erlangen, Germany
| | - Dominik Schneidereit
- Institute of Medical Biotechnology, Department of Chemical and Biological Engineering, Friedrich-Alexander University of Erlangen-Nürnberg, 91052 Erlangen, Germany
| | - Oliver Friedrich
- Institute of Medical Biotechnology, Department of Chemical and Biological Engineering, Friedrich-Alexander University of Erlangen-Nürnberg, 91052 Erlangen, Germany
| | - Kjell Hultenby
- Department of Laboratory Medicine, Karolinska Institutet, Karolinska University Hospital Huddinge, 141 86 Huddinge, Sweden
| | - Joseph D. Bruton
- Department of Physiology and Pharmacology, Karolinska Institutet, 171 77 Stockholm, Sweden
| | - Niklas Ivarsson
- Department of Physiology and Pharmacology, Karolinska Institutet, 171 77 Stockholm, Sweden
| | - Linda Sandblad
- Umeå Core Facility for Electron Microscopy, Department of Chemistry, Umeå University, 901 87 Umeå, Sweden
| | - Volker M. Lauschke
- Department of Physiology and Pharmacology, Karolinska Institutet, 171 77 Stockholm, Sweden
- Dr. Margarete Fischer-Bosch-Institute of Clinical Pharmacology, Stuttgart, Germany
- University of Tübingen, Tübingen, Germany
| | - Håkan Westerblad
- Department of Physiology and Pharmacology, Karolinska Institutet, 171 77 Stockholm, Sweden
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Savaş D, Tarsuslu T. Reliability and validity of the Turkish version of the Upper Limb Short Questionnaire in Duchenne muscular dystrophy. Somatosens Mot Res 2022; 40:56-61. [PMID: 36538388 DOI: 10.1080/08990220.2022.2157391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
PURPOSE This study aimed to evaluate the construct validity and reliability of the Turkish version of the Upper Limb Short Questionnaire in Duchenne muscular dystrophy. MATERIALS AND METHODS A total of 41 children with Duchenne muscular dystrophy have participated in the study. Upper and lower extremities functional levels were assessed with Vignos Scale and Brooke Upper Extremity Functional Rating Scale, respectively. The construct validity of the questionnaire was determined using the correlation between the Upper Limb Short Questionnaire and ABILHAND-Kids. The Cronbach alpha value was calculated to determine internal consistency. To determine test-retest reliability, 17 randomly selected children were evaluated seven days after the first evaluation, and the 'Intraclass Correlation Coefficient' value was calculated. RESULTS There was a moderate level of positive correlation between the Upper Limb Short Questionnaire scores and the Vignos Scale (r = 0.52, p < 0.001) and the Brooke Upper Extremity Functional Rating Scale (r = 0.65, p < 0.001). There was a strong correlation between the Upper Limb Short Questionnaire and ABILHAND-Kids in the negative direction (r= -0.80, p < 0.001). Internal consistency of the ULSQ was fairly high (Cronbach's alpha = 0.785) and test-retest reliability was good (ICC = 0.86). CONCLUSION The Turkish version of Upper Limb Short Questionnaire is a valid and reliable scale for children with Duchenne muscular dystrophy. It can be a useful tool in the UE clinical evaluation of children with Duchenne muscular dystrophy.
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Affiliation(s)
- Dilan Savaş
- Institute of Health Sciences, Dokuz Eylul University, Izmir, Turkey
| | - Tülay Tarsuslu
- Faculty of Physical Therapy and Rehabilitation, Dokuz Eylul University, Izmir, Turkey
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Wu B, Drains M, Shah SN, Lu PJ, Leroy V, Killilee J, Rawls R, Tucker JD, Blaeser A, Lu QL. Ribitol dose-dependently enhances matriglycan expression and improves muscle function with prolonged life span in limb girdle muscular dystrophy 2I mouse model. PLoS One 2022; 17:e0278482. [PMID: 36454905 PMCID: PMC9714851 DOI: 10.1371/journal.pone.0278482] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Accepted: 11/16/2022] [Indexed: 12/05/2022] Open
Abstract
Limb Girdle Muscular Dystrophy 2I (LGMDR9) is one of the most common LGMD characterized by defects in glycosylation of α-dystroglycan (matriglycan) resulting from mutations of Fukutin-related protein (FKRP). There is no effective therapy currently available. We recently demonstrated that ribitol supplement increases levels of matriglycan in cells in vitro and in FKRP-P448L (P448L) mutant mouse model through drinking water administration. To be clinically relevant, we have now conducted a dose-escalating efficacy study by gavage in P448L mutant mice. Six months of ribitol treatment daily significantly rescued functions of skeletal, respiratory, and cardiac muscles dose-dependently. This was associated with a dose dependent increase in matriglycan and improvement in muscle pathology with reductions in muscle degeneration, inflammatory infiltration and fibrosis. Importantly, ribitol significantly increased life span and muscle functions of the female animals receiving treatment from 10 months of age. The only observed side effect was gastrointestinal tract bloating with loose stool and this effect is also dose dependent. The results validate the mechanism that ribitol as a pre-substrate of glycosyltransferase is able to compensate for the decreased function of mutant FKRP with restoration of matriglycan expression and provide a guidance for future clinical trial design.
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Affiliation(s)
- Bo Wu
- McColl-Lockwood Laboratory for Muscular Dystrophy Research, Atrium Health Musculoskeletal Institute, Carolinas Medical Center, Charlotte, North Carolina, United States of America
- * E-mail: (BW); (QLL)
| | - Morgan Drains
- McColl-Lockwood Laboratory for Muscular Dystrophy Research, Atrium Health Musculoskeletal Institute, Carolinas Medical Center, Charlotte, North Carolina, United States of America
| | - Sapana N. Shah
- McColl-Lockwood Laboratory for Muscular Dystrophy Research, Atrium Health Musculoskeletal Institute, Carolinas Medical Center, Charlotte, North Carolina, United States of America
| | - Pei Juan Lu
- McColl-Lockwood Laboratory for Muscular Dystrophy Research, Atrium Health Musculoskeletal Institute, Carolinas Medical Center, Charlotte, North Carolina, United States of America
| | - Victoria Leroy
- McColl-Lockwood Laboratory for Muscular Dystrophy Research, Atrium Health Musculoskeletal Institute, Carolinas Medical Center, Charlotte, North Carolina, United States of America
| | - Jessalyn Killilee
- McColl-Lockwood Laboratory for Muscular Dystrophy Research, Atrium Health Musculoskeletal Institute, Carolinas Medical Center, Charlotte, North Carolina, United States of America
| | - Raegan Rawls
- McColl-Lockwood Laboratory for Muscular Dystrophy Research, Atrium Health Musculoskeletal Institute, Carolinas Medical Center, Charlotte, North Carolina, United States of America
| | - Jason D. Tucker
- McColl-Lockwood Laboratory for Muscular Dystrophy Research, Atrium Health Musculoskeletal Institute, Carolinas Medical Center, Charlotte, North Carolina, United States of America
| | - Anthony Blaeser
- McColl-Lockwood Laboratory for Muscular Dystrophy Research, Atrium Health Musculoskeletal Institute, Carolinas Medical Center, Charlotte, North Carolina, United States of America
| | - Qi Long Lu
- McColl-Lockwood Laboratory for Muscular Dystrophy Research, Atrium Health Musculoskeletal Institute, Carolinas Medical Center, Charlotte, North Carolina, United States of America
- * E-mail: (BW); (QLL)
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Lazarou I, Nikolopoulos S, Georgiadis K, Oikonomou VP, Mariakaki A, Kompatsiaris I. Exploring the Connection of Brain Computer Interfaces and Multimedia Use With the Social Integration of People With Various Motor Disabilities: A Questionnaire-Based Usability Study. Front Digit Health 2022; 4:846963. [PMID: 35990018 PMCID: PMC9385967 DOI: 10.3389/fdgth.2022.846963] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2021] [Accepted: 06/22/2022] [Indexed: 11/13/2022] Open
Abstract
We have designed a platform to aid people with motor disabilities to be part of digital environments, in order to create digitally and socially inclusive activities that promote their quality of life. To evaluate in depth the impact of the platform on social inclusion indicators across patients with various motor disabilities, we constructed a questionnaire in which the following indicators were assessed: (i) Well Being, (ii) Empowerment, (iii) Participation, (iv) Social Capital, (v) Education, and (vi) Employment. In total 30 participants (10 with Neuromuscular Disorders-NMD, 10 with Spinal Cord Injury-SCI, and 10 with Parkinson's Disease-PD) used the platform for ~1 month, and its impact on social inclusion indicators was measured before and after the usage. Moreover, monitoring mechanisms were used to track computer usage as well as an online social activity. Finally, testimonials and experimenter input were collected to enrich the study with qualitative understanding. All participants were favorable to use the suggested platform, while they would prefer it for longer periods of time in order to become “re-awakened” to possibilities of expanded connection and inclusion, while it became clear that the platform has to offer them further the option to use it in a reclining position. The present study has clearly shown that the challenge of social inclusion cannot be tackled solely with technology and it needs to integrate persuasive design elements that foster experimentation and discovery.
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Affiliation(s)
- Ioulietta Lazarou
- Centre for Research and Technology Hellas (CERTH-ITI), Information Technologies Institute, Thessaloniki, Greece
- *Correspondence: Ioulietta Lazarou
| | - Spiros Nikolopoulos
- Centre for Research and Technology Hellas (CERTH-ITI), Information Technologies Institute, Thessaloniki, Greece
| | - Kostas Georgiadis
- Centre for Research and Technology Hellas (CERTH-ITI), Information Technologies Institute, Thessaloniki, Greece
| | - Vangelis P. Oikonomou
- Centre for Research and Technology Hellas (CERTH-ITI), Information Technologies Institute, Thessaloniki, Greece
| | - Agnes Mariakaki
- Muscular Dystrophy Association-Hellas (MDA-Hellas), Hellas, Athens, Greece
| | - Ioannis Kompatsiaris
- Centre for Research and Technology Hellas (CERTH-ITI), Information Technologies Institute, Thessaloniki, Greece
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Gaertner A, Burr L, Klauke B, Brodehl A, Laser KT, Klingel K, Tiesmeier J, Schulz U, zu Knyphausen E, Gummert J, Milting H. Compound Heterozygous FKTN Variants in a Patient with Dilated Cardiomyopathy Led to an Aberrant α-Dystroglycan Pattern. Int J Mol Sci 2022; 23:ijms23126685. [PMID: 35743126 PMCID: PMC9223741 DOI: 10.3390/ijms23126685] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Revised: 06/13/2022] [Accepted: 06/14/2022] [Indexed: 02/01/2023] Open
Abstract
Fukutin encoded by FKTN is a ribitol 5-phosphate transferase involved in glycosylation of α-dystroglycan. It is known that mutations in FKTN affect the glycosylation of α-dystroglycan, leading to a dystroglycanopathy. Dystroglycanopathies are a group of syndromes with a broad clinical spectrum including dilated cardiomyopathy and muscular dystrophy. In this study, we reported the case of a patient with muscular dystrophy, early onset dilated cardiomyopathy, and elevated creatine kinase levels who was a carrier of the compound heterozygous variants p.Ser299Arg and p.Asn442Ser in FKTN. Our work showed that compound heterozygous mutations in FKTN lead to a loss of fully glycosylated α-dystroglycan and result in cardiomyopathy and end-stage heart failure at a young age.
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Affiliation(s)
- Anna Gaertner
- Erich und Hanna Klessmann-Institut für Kardiovaskuläre Forschung und Entwicklung, Klinik für Thorax- und Kardiovaskularchirurgie, Herz und Diabeteszentrum NRW, Universitätsklinikum der Ruhr-Universität Bochum, Georgstr. 11, 32545 Bad Oeynhausen, Germany; (L.B.); (B.K.); (A.B.); (J.T.); (U.S.); (J.G.)
- Correspondence: (A.G.); (H.M.)
| | - Lidia Burr
- Erich und Hanna Klessmann-Institut für Kardiovaskuläre Forschung und Entwicklung, Klinik für Thorax- und Kardiovaskularchirurgie, Herz und Diabeteszentrum NRW, Universitätsklinikum der Ruhr-Universität Bochum, Georgstr. 11, 32545 Bad Oeynhausen, Germany; (L.B.); (B.K.); (A.B.); (J.T.); (U.S.); (J.G.)
| | - Baerbel Klauke
- Erich und Hanna Klessmann-Institut für Kardiovaskuläre Forschung und Entwicklung, Klinik für Thorax- und Kardiovaskularchirurgie, Herz und Diabeteszentrum NRW, Universitätsklinikum der Ruhr-Universität Bochum, Georgstr. 11, 32545 Bad Oeynhausen, Germany; (L.B.); (B.K.); (A.B.); (J.T.); (U.S.); (J.G.)
| | - Andreas Brodehl
- Erich und Hanna Klessmann-Institut für Kardiovaskuläre Forschung und Entwicklung, Klinik für Thorax- und Kardiovaskularchirurgie, Herz und Diabeteszentrum NRW, Universitätsklinikum der Ruhr-Universität Bochum, Georgstr. 11, 32545 Bad Oeynhausen, Germany; (L.B.); (B.K.); (A.B.); (J.T.); (U.S.); (J.G.)
| | - Kai Thorsten Laser
- Zentrum für Angeborene Herzfehler, Herz und Diabeteszentrum NRW, Universitätsklinikum der Ruhr-Universität Bochum, Georgstr. 11, 32545 Bad Oeynhausen, Germany; (K.T.L.); (E.z.K.)
| | - Karin Klingel
- Kardiopathologie, Institut für Pathologie und Neuropathologie, Universitätsklinikum Tübingen, Liebermeisterstraße 8, 72076 Tübingen, Germany;
| | - Jens Tiesmeier
- Erich und Hanna Klessmann-Institut für Kardiovaskuläre Forschung und Entwicklung, Klinik für Thorax- und Kardiovaskularchirurgie, Herz und Diabeteszentrum NRW, Universitätsklinikum der Ruhr-Universität Bochum, Georgstr. 11, 32545 Bad Oeynhausen, Germany; (L.B.); (B.K.); (A.B.); (J.T.); (U.S.); (J.G.)
| | - Uwe Schulz
- Erich und Hanna Klessmann-Institut für Kardiovaskuläre Forschung und Entwicklung, Klinik für Thorax- und Kardiovaskularchirurgie, Herz und Diabeteszentrum NRW, Universitätsklinikum der Ruhr-Universität Bochum, Georgstr. 11, 32545 Bad Oeynhausen, Germany; (L.B.); (B.K.); (A.B.); (J.T.); (U.S.); (J.G.)
| | - Edzard zu Knyphausen
- Zentrum für Angeborene Herzfehler, Herz und Diabeteszentrum NRW, Universitätsklinikum der Ruhr-Universität Bochum, Georgstr. 11, 32545 Bad Oeynhausen, Germany; (K.T.L.); (E.z.K.)
| | - Jan Gummert
- Erich und Hanna Klessmann-Institut für Kardiovaskuläre Forschung und Entwicklung, Klinik für Thorax- und Kardiovaskularchirurgie, Herz und Diabeteszentrum NRW, Universitätsklinikum der Ruhr-Universität Bochum, Georgstr. 11, 32545 Bad Oeynhausen, Germany; (L.B.); (B.K.); (A.B.); (J.T.); (U.S.); (J.G.)
| | - Hendrik Milting
- Erich und Hanna Klessmann-Institut für Kardiovaskuläre Forschung und Entwicklung, Klinik für Thorax- und Kardiovaskularchirurgie, Herz und Diabeteszentrum NRW, Universitätsklinikum der Ruhr-Universität Bochum, Georgstr. 11, 32545 Bad Oeynhausen, Germany; (L.B.); (B.K.); (A.B.); (J.T.); (U.S.); (J.G.)
- Correspondence: (A.G.); (H.M.)
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Comparison of telerehabilitation versus home-based video exercise in patients with Duchenne muscular dystrophy: a single-blind randomized study. Acta Neurol Belg 2022; 122:1269-1280. [PMID: 35616780 PMCID: PMC9133319 DOI: 10.1007/s13760-022-01975-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2021] [Accepted: 05/03/2022] [Indexed: 11/11/2022]
Abstract
Introduction Patients with Duchenne muscular dystrophy (DMD) have lost their access to on-site rehabilitation due to the COVID-19 pandemic. Telerehabilitation can be a viable approach for these patients to protect their muscle strength and functional status. The aim of this study is to compare telerehabilitation with home-based video exercises. Patients and methods Male, ambulatory DMD patients were randomized into telerehabilitation and video-exercise groups. Nineteen patients were included in the final analyses. Telerehabilitation consisted of live online exercises, while video exercise implemented a pre-recorded video as a home-based program. Both programs spanned 8 weeks, three times a week. Patients’ muscle strength with a hand-held dynamometer, Quick Motor Function Test, North-Star Ambulatory Assessment (NSAA), 6-Minute Walk Test (6MWT) and Caregiver Burden were recorded before and after treatment. Results The 6MWT of the telerehabilitation group was391.26 ± 95.08 m before and387.75 ± 210.93 after treatment (p = 0.94) and 327.46 ± 103.88 m before treatment and313.77 ± 114.55 after treatment in video group (p = 0.63). The mean NSAA score of the telerehabilitation group were26.70 ± 8.04 before treatment and 25.20 ± 11.33 after treatment (p = 0.24). In the video group scores were 21.66 ± 6.65 before to 22.00 ± 8.61 after treatment (p = 0.87). There were no significant changes between groups at the end of the treatments. The telerehabilitation group's neck extension, bilateral shoulder abduction, and left shoulder flexion, bilateral knee flexion and extension, bilateral ankle dorsiflexion, and left ankle plantar flexion strength improved significantly and were better than the video group (p < 0.05 for all measurements). Conclusion A telerehabilitation approach is superior in improving muscle strength than a video-based home exercise, but none of the programs improved functional outcomes in ambulatory patients with DMD. Supplementary Information The online version contains supplementary material available at 10.1007/s13760-022-01975-4.
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10
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Awano H, Saito Y, Shimizu M, Sekiguchi K, Niijima S, Matsuo M, Maegaki Y, Izumi I, Kikuchi C, Ishibashi M, Okazaki T, Komaki H, Iijima K, Nishino I. FKRP mutations cause congenital muscular dystrophy 1C and limb-girdle muscular dystrophy 2I in Asian patients. J Clin Neurosci 2021; 92:215-221. [PMID: 34509255 DOI: 10.1016/j.jocn.2021.08.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2020] [Revised: 06/18/2021] [Accepted: 08/15/2021] [Indexed: 11/19/2022]
Abstract
Mutation in the fukutin-related protein (FKRP) gene causes alpha-dystroglycanopathies, a group of autosomal recessive disorders associated with defective glycosylated alpha-dystroglycan (α-DG). The disease phenotype shows a broad spectrum, from the most severe congenital form involving brain and eye anomalies to milder limb-girdle form. FKRP-related alpha-dystroglycanopathies are common in European countries. However, a limited number of patients have been reported in Asian countries. Here, we presented the clinical, pathological, and genetic findings of nine patients with FKRP mutations identified at a single muscle repository center in Japan. Three and six patients were diagnosed with congenital muscular dystrophy type 1C and limb-girdle muscular dystrophy 2I, respectively. None of our Asian patients showed the most severe form of alpha-dystroglycanopathy. While all patients showed a reduction in glycosylated α-DG levels, to variable degrees, these levels did not correlate to clinical severity. Fifteen distinct pathogenic mutations were identified in our cohort, including five novel mutations. Unlike in the populations belonging to European countries, no common mutation was found in our cohort.
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Affiliation(s)
- Hiroyuki Awano
- Department of Pediatrics, Kobe University Graduate School of Medicine, 7-5-1 Kusunoki-cho, Chuo, Kobe, Hyogo 650-0017, Japan.
| | - Yoshihiko Saito
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry (NCNP), 4-1-1 Ogawa-Higashi-cho, Kodaira, Tokyo 187-8502, Japan
| | - Mamiko Shimizu
- Shimizu Children's Clinic, 3-152 Komaki, Komaki, Aichi 485-0041, Japan
| | - Kenji Sekiguchi
- Division of Neurology, Kobe University Graduate School of Medicine, 7-5-1 Kusunoki-cho, Chuo, Kobe, Hyogo 650-0017, Japan
| | - Shinichi Niijima
- Department of Pediatrics, Juntendo University, Nerima Hospital, 3-1-10 Takanodai, Nerima, Tokyo 177-8521, Japan
| | - Masafumi Matsuo
- Research Center for Locomotion Biology, Kobe Gakuin Univesity, 518 Arise, Ikawadani-cho, Nishi, Kobe, Hyogo 651-2180, Japan
| | - Yoshihiro Maegaki
- Division of Child Neurology, Department of Brain and Neurosciences, Faculty of Medicine, Tottori University, 86 Nishi-cho, Yonago, Tottori 683-8504, Japan
| | - Isho Izumi
- Ibaraki Children's Hospital, 3-3-1 Futabadai, Mito, Ibaraki 311-4145, Japan
| | - Chiya Kikuchi
- Department of Pediatrics, National Hospital Organization Ehime Medical Center, 366 Yokogawara, Toon, Ehime 791-0281, Japan
| | - Masato Ishibashi
- Department of Neurology, Faculty of Medicine, Oita University, 1-1 Hasamamachi-idaigaoka, Yufu, Oita 879-5593, Japan
| | - Tetsuya Okazaki
- Department of Clinical Genetics, Tottori University Hospital, 36-1 Nishi-cho, Yonago, Tottori 683-8504, Japan
| | - Hirofumi Komaki
- Translational Medical Center, National Institute of Neuroscience, National Center of Neurology and Psychiatry (NCNP), 4-1-1 Ogawa-Higashi-cho, Kodaira, Tokyo 187-8502, Japan
| | - Kazumoto Iijima
- Department of Pediatrics, Kobe University Graduate School of Medicine, 7-5-1 Kusunoki-cho, Chuo, Kobe, Hyogo 650-0017, Japan
| | - Ichizo Nishino
- Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry (NCNP), 4-1-1 Ogawa-Higashi-cho, Kodaira, Tokyo 187-8502, Japan
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11
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Li JY, Liu SZ, Zheng DF, Zhang YS, Yu M. Collagen VI-related myopathy with scoliosis alone: A case report and literature review. World J Clin Cases 2021; 9:5302-5312. [PMID: 34307582 PMCID: PMC8283577 DOI: 10.12998/wjcc.v9.i19.5302] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Revised: 04/26/2021] [Accepted: 04/29/2021] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Scoliosis is a complex three-dimensional deformity of spine and one of the common complications of collagen VI-related myopathy, caused by mutations in collagen type VI alpha 1 chain (COL6A1), COL6A2, and COL6A3 genes. The typical clinical presentations of collagen VI-related myopathy include weakness, hypotonia, laxity of distal joints, contractures of proximal joints, and skeletal deformities.
CASE SUMMARY A 28-year-old female presented with scoliosis for 28 years without weakness, hypotonia, laxity of distal joints, and contracture of proximal joints. Computed tomography and magnetic resonance imaging revealed hemivertebra, butterfly vertebra, and the missing vertebral space. Patients underwent orthopedic surgery and paravertebral muscle biopsy. The Cobb angle dropped from 103.4° to 52.9°. However, the muscle biopsy showed neurogenic muscular atrophy with myogenic lesions, suggesting congenital muscular dystrophy. Gene analysis indicated that mutations in COL6A1 (c.1612-10G>A) and COL6A2 (c.115+10G>T, c.2749G>A). Immunohistochemistry staining for collagen VI displayed shallow and discontinuous. Eventually, the patient was diagnosed as collagen VI-related myopathy.
CONCLUSION This newly found subtype of collagen VI-related myopathy has no typical manifestations; however, it is characterized by severe scoliosis and congenital vertebral deformity.
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Affiliation(s)
- Jun-Yu Li
- Department of Orthopaedics, Peking University Third Hospital, Beijing 100083, China
| | - Shuo-Zi Liu
- Department of Hematology, Peking University Third Hospital, Beijing 100083, China
| | - Dan-Feng Zheng
- Department of Pathology, Peking University Third Hospital, Beijing 100083, China
| | - Ying-Shuang Zhang
- Department of Neurology, Peking University Third Hospital, Beijing 100083, China
| | - Miao Yu
- Department of Orthopaedics, Peking University Third Hospital, Beijing 100083, China
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12
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Lu QL. Revertant Phenomenon in DMD and LGMD2I and Its Therapeutic Implications: A Review of Study Under Mentorship of Terrence Partridge. J Neuromuscul Dis 2021; 8:S359-S367. [PMID: 34151854 PMCID: PMC8673541 DOI: 10.3233/jnd-210692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This review recollects my initial research focus on revertant fibers (expressing dystrophin in the background of frame-shifting mutation) in Duchenne muscular dystrophy (DMD) muscles in Professor Terrence Partridge’s Muscle Cell Biology Laboratory in MRC Clinical Research Science Center, Harmmersmith Hospital, London, UK. Our data indicated that revertant fibers are most likely resulted from epigenetic random events which skip exon(s) flanking the mutated exon, leading to the restoration of the reading frame. Some of these events establish themselves as relatively permanent skipping patterns, a mechanism similar to multiple transcript species established in various cell types. With this hypothesis, antisense oligonucleotide-mediated exon skipping is likely to have a great chance to achieve restoration of therapeutic levels of dystrophin in DMD muscles. This leads to our first reports of local and systemic efficacy of antisense oligonucleotide-mediated exon skipping for DMD treatment. The experience under Terry’s mentorship shaped my thinking and led me to explore another revertant feature in the dystroglycanopathy caused by mutations in the Fukutin Related Protein (FKRP) gene which functions as a glycosyltransferase. Mutant FKRPs retain partial function and produce a fraction of normal to no detectable levels of laminin-binding α-dystroglycan (matriglycan) in most of the muscle fibers. Reversion to near normal levels of matriglycan expression in muscles with FKRP mutations depends on muscle regeneration and in muscles of neonate mice, suggesting that changes in metabolism and gene expression could be sufficient to compensate for the reduced function of mutant FKRP genes even those associated with severe congenital muscular dystrophy (CMD). This is now supported by our successful demonstration that supply of FKRP mutant mice with ribitol, a precursor for substrate of FKRP, is sufficient to restore the levels of matriglycan with therapeutic significance. Our data overall suggest that rare events of reversion in muscular dystrophy, and likely other diseases could provide unique insight for mechanisms and therapeutic exploitation.
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Affiliation(s)
- Qi Long Lu
- McColl-Lockwood Laboratory for Muscular Dystrophy Research, Cannon Research Center, Musculoskeletal Institute, Atrium Health, Charlotte, NC, USA
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13
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The linkage between inflammation and fibrosis in muscular dystrophies: The axis autotaxin-lysophosphatidic acid as a new therapeutic target? J Cell Commun Signal 2021; 15:317-334. [PMID: 33689121 PMCID: PMC8222483 DOI: 10.1007/s12079-021-00610-w] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2021] [Accepted: 02/11/2021] [Indexed: 02/06/2023] Open
Abstract
Muscular dystrophies (MDs) are a diverse group of severe disorders characterized by increased skeletal muscle feebleness. In many cases, respiratory and cardiac muscles are also compromised. Skeletal muscle inflammation and fibrosis are hallmarks of several skeletal muscle diseases, including MDs. Until now, several keys signaling pathways and factors that regulate inflammation and fibrosis have been identified. However, no curative treatments are available. Therefore, it is necessary to find new therapeutic targets to fight these diseases and improve muscle performance. Lysophosphatidic acid (LPA) is an active glycerophospholipid mainly synthesized by the secreted enzyme autotaxin (ATX), which activates six different G protein-coupled receptors named LPA1 to LPA6 (LPARs). In conjunction, they are part of the ATX/LPA/LPARs axis, involved in the inflammatory and fibrotic response in several organs-tissues. This review recapitulates the most relevant aspects of inflammation and fibrosis in MDs. It analyzes experimental evidence of the effects of the ATX/LPA/LPARs axis on inflammatory and fibrotic responses. Finally, we speculate about its potential role as a new therapeutic pharmacological target to treat these diseases.
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14
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Whole Exome Sequencing as a Diagnostic Tool for Unidentified Muscular Dystrophy in a Vietnamese Family. Diagnostics (Basel) 2020; 10:diagnostics10100741. [PMID: 32987775 PMCID: PMC7598670 DOI: 10.3390/diagnostics10100741] [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: 07/30/2020] [Revised: 09/15/2020] [Accepted: 09/22/2020] [Indexed: 11/17/2022] Open
Abstract
Muscular dystrophies are a group of heterogeneous clinical and genetic disorders. Two siblings presented with characteristics like muscular dystrophy, abnormal white matter, and elevated serum creatine kinase level. The high throughput of whole exome sequencing (WES) makes it an efficient tool for obtaining a precise diagnosis without the need for immunohistochemistry. WES was performed in the two siblings and their parents, followed by prioritization of variants and validation by Sanger sequencing. Very rare variants with moderate to high predicted impact in genes associated with neuromuscular disorders were selected. We identified two pathogenic missense variants, c.778C>T (p.H260Y) and c.2987G>A (p.C996Y), in the LAMA2 gene (NM_000426.3), in the homozygous state in two siblings, and in the heterozygous state in their unaffected parents, which were confirmed by Sanger sequencing. Variant c.2987G>A has not been reported previously. These variants may lead to a change in the structure and function of laminin-α2, a member of the family of laminin-211, which is an extracellular matrix protein that functions to stabilize the basement membrane of muscle fibers during contractions. Overall, WES enabled an accurate diagnosis of both patients with LAMA2-related muscular dystrophy and expanded the spectrum of missense variants in LAMA2.
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15
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Demir G, Bulut N, Yılmaz Ö, Karaduman A, Alemdaroğlu-Gürbüz İ. Manual ability and upper limb performance in nonambulatory stage of Duchenne muscular dystrophy. Arch Pediatr 2020; 27:304-309. [PMID: 32718814 DOI: 10.1016/j.arcped.2020.06.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Revised: 05/03/2020] [Accepted: 06/23/2020] [Indexed: 11/26/2022]
Abstract
PURPOSE The functional use of the upper extremities in daily living activities has become important in the later ages with the increasing life expectancy of patients with Duchenne muscular dystrophy (DMD). This study aimed to assess manual ability and upper limb performance of nonambulatory children with DMD, and to determine their relationship with factors that might affect ability and performance. METHODS Manual ability was determined via the ABILHAND-Kids questionnaire and upper limb performance was assessed with the Performance of Upper Limb (PUL) test. Possible related factors such as functional level, steroid usage, upper limb range of motion (ROM), thumb opposition, upper limb muscular strength, and grip strength were evaluated. Correlations of related factors with manual ability and upper limb performance were analyzed. RESULTS The mean age of 23 nonambulatory DMD children was 13.04±1.39 years. Moderate impairments were determined according to the ABILHAND-Kids and PUL, with scores of 26.30±10.74 and 46.22±15.02, respectively. The functional level, steroid usage, duration of wheelchair use, upper extremity ROM, and global upper limb muscle strength of children were weak-to-strongly correlated with at least one score of ABILHAND-Kids and PUL (P<0.05). CONCLUSION Children with DMD may already have severe proximal and mid-level upper extremity involvement, even reflected in distal functions, at the time when they progress to the nonambulatory stage. Besides muscular strength, many related factors should be taken into account for therapists to assess and treat upper limb performance at later stages of DMD.
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Affiliation(s)
- G Demir
- Faculty of Physical Therapy and Rehabilitation, Hacettepe University,, 06100 Samanpazarı, Altındağ, Ankara, Turkey
| | - N Bulut
- Faculty of Physical Therapy and Rehabilitation, Hacettepe University,, 06100 Samanpazarı, Altındağ, Ankara, Turkey
| | - Ö Yılmaz
- Faculty of Physical Therapy and Rehabilitation, Hacettepe University,, 06100 Samanpazarı, Altındağ, Ankara, Turkey
| | - A Karaduman
- Faculty of Physical Therapy and Rehabilitation, Hacettepe University,, 06100 Samanpazarı, Altındağ, Ankara, Turkey
| | - İ Alemdaroğlu-Gürbüz
- Faculty of Physical Therapy and Rehabilitation, Hacettepe University,, 06100 Samanpazarı, Altındağ, Ankara, Turkey.
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16
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Azzag K, Ortiz-Cordero C, Oliveira NAJ, Magli A, Selvaraj S, Tungtur S, Upchurch W, Iaizzo PA, Lu QL, Perlingeiro RCR. Efficient engraftment of pluripotent stem cell-derived myogenic progenitors in a novel immunodeficient mouse model of limb girdle muscular dystrophy 2I. Skelet Muscle 2020; 10:10. [PMID: 32321586 PMCID: PMC7175515 DOI: 10.1186/s13395-020-00228-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2019] [Accepted: 03/11/2020] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND Defects in α-dystroglycan (DG) glycosylation characterize a group of muscular dystrophies known as dystroglycanopathies. One of the key effectors in the α-DG glycosylation pathway is the glycosyltransferase fukutin-related protein (FKRP). Mutations in FKRP lead to a large spectrum of muscular dystrophies, including limb girdle muscular dystrophy 2I (LGMD2I). It remains unknown whether stem cell transplantation can promote muscle regeneration and ameliorate the muscle wasting phenotype associated with FKRP mutations. RESULTS Here we transplanted murine and human pluripotent stem cell-derived myogenic progenitors into a novel immunodeficient FKRP-mutant mouse model by intra-muscular injection. Upon both mouse and human cell transplantation, we observe the presence of donor-derived myofibers even in absence of pre-injury, and the rescue of α-DG functional glycosylation, as shown by IIH6 immunoreactivity. The presence of donor-derived cells expressing Pax7 under the basal lamina is indicative of satellite cell engraftment, and therefore, long-term repopulation potential. Functional assays performed in the mouse-to-mouse cohort revealed enhanced specific force in transplanted muscles compared to PBS-injected controls. CONCLUSIONS Altogether, our data demonstrate for the first time the suitability of a cell-based therapeutic approach to improve the muscle phenotype of dystrophic FKRP-mutant mice.
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Affiliation(s)
- Karim Azzag
- Lillehei Heart Institute, Department of Medicine, University of Minnesota, 4-128 CCRB, 2231 6th St. SE, Minneapolis, MN, 55455, USA
| | - Carolina Ortiz-Cordero
- Lillehei Heart Institute, Department of Medicine, University of Minnesota, 4-128 CCRB, 2231 6th St. SE, Minneapolis, MN, 55455, USA
- Department of Integrative Biology and Physiology, University of Minnesota, Minneapolis, MN, USA
| | - Nelio A J Oliveira
- Lillehei Heart Institute, Department of Medicine, University of Minnesota, 4-128 CCRB, 2231 6th St. SE, Minneapolis, MN, 55455, USA
| | - Alessandro Magli
- Lillehei Heart Institute, Department of Medicine, University of Minnesota, 4-128 CCRB, 2231 6th St. SE, Minneapolis, MN, 55455, USA
- Stem Cell Institute, University of Minnesota, Minneapolis, MN, USA
| | - Sridhar Selvaraj
- Lillehei Heart Institute, Department of Medicine, University of Minnesota, 4-128 CCRB, 2231 6th St. SE, Minneapolis, MN, 55455, USA
| | - Sudheer Tungtur
- Lillehei Heart Institute, Department of Medicine, University of Minnesota, 4-128 CCRB, 2231 6th St. SE, Minneapolis, MN, 55455, USA
| | - Weston Upchurch
- Visible Heart Laboratories, Department of Surgery, University of Minnesota, Minneapolis, MN, USA
| | - Paul A Iaizzo
- Visible Heart Laboratories, Department of Surgery, University of Minnesota, Minneapolis, MN, USA
| | - Qi Long Lu
- McColl-Lockwood Laboratory for Muscular Dystrophy Research, Cannon Research Center, Carolinas Medical Center, Atrium Health, Charlotte, North Carolina, NC, USA
| | - Rita C R Perlingeiro
- Lillehei Heart Institute, Department of Medicine, University of Minnesota, 4-128 CCRB, 2231 6th St. SE, Minneapolis, MN, 55455, USA.
- Department of Integrative Biology and Physiology, University of Minnesota, Minneapolis, MN, USA.
- Stem Cell Institute, University of Minnesota, Minneapolis, MN, USA.
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Abstract
PURPOSE OF REVIEW Congenital muscular dystrophies and congenital myopathies are a heterogeneous group of disorders resulting in hypotonia, muscle weakness, and dystrophic or myopathic features on muscle biopsy. This article summarizes the clinical and genetic aspects of these disorders. RECENT FINDINGS Historically, diagnoses of congenital muscular dystrophy and congenital myopathy have been made by clinical features and histopathology; however, recent advances in genetics have changed diagnostic practice by relying more heavily on genetic findings. This article reviews the clinical and genetic features of the most common congenital muscular dystrophies including laminin subunit alpha 2 (LAMA2)-related (merosin deficient), collagen VI-related, and α-dystroglycan-related congenital muscular dystrophies and reviews the most common congenital myopathies including nemaline rod, core, and centronuclear myopathies. With the increasing accessibility of genetic testing, the number of genes found to be associated with these disorders has increased dramatically. A wide spectrum of severity and onset (from birth to adulthood) exist across all subtypes. Progression and other features are variable depending on the subtype and severity of the specific genetic mutation. SUMMARY Congenital muscular dystrophy and congenital myopathy are increasingly recognized disorders. A growing appreciation for the breadth of phenotypic variability and overlap between established subtypes has challenged long-standing phenotypic and histopathologic classifications of these disorders but has driven a greater understanding of pathogenesis and opened the door to the development of novel treatments.
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Cataldi MP, Blaeser A, Lu P, Leroy V, Lu QL. ISPD Overexpression Enhances Ribitol-Induced Glycosylation of α-Dystroglycan in Dystrophic FKRP Mutant Mice. MOLECULAR THERAPY-METHODS & CLINICAL DEVELOPMENT 2019; 17:271-280. [PMID: 31988979 PMCID: PMC6970132 DOI: 10.1016/j.omtm.2019.12.005] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Accepted: 12/03/2019] [Indexed: 12/11/2022]
Abstract
Dystroglycanopathy, a subgroup of muscular dystrophies, is characterized by hypoglycosylation of α-dystroglycan (α-DG), which reduces its laminin-binding activity to extracellular matrix proteins, causing progressive loss of muscle integrity and function. Mutations in the fukutin-related protein (FKRP) gene are the most common causes of dystroglycanopathy. FKRP transfers ribitol-5-phosphate to the O-mannosyl glycan on α-DG from substrate cytidine diphosphate (CDP)-ribitol, which is synthesized by isoprenoid synthase domain-containing protein (ISPD). We previously reported that oral administration of ribitol restores therapeutic levels of functional glycosylation of α-DG (F-α-DG) in a FKRP mutant mouse model. Here we examine the contribution of adeno-associated virus (AAV)-mediated overexpression of ISPD to the levels of CDP-ribitol and F-α-DG with and without ribitol supplementation in the disease model. ISPD overexpression alone and in combination with ribitol improves dystrophic phenotype. Furthermore, the combined approach of ribitol and ISPD acts synergistically, increasing F-α-DG up to 40% of normal levels in cardiac muscle and more than 20% in limb and diaphragm. The results suggest that low levels of substrate limit production of CDP-ribitol, and endogenous ISPD also becomes a limiting factor in the presence of a supraphysiological concentration of ribitol. Our data support further investigation of the regulatory pathway for enhancing efficacy of ribitol supplement to FKRP-related dystroglycanopathy.
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Affiliation(s)
- Marcela P Cataldi
- McColl-Lockwood Laboratory for Muscular Dystrophy Research, Cannon Research Center, Carolinas Medical Center, Atrium Health, Charlotte, NC 28203, USA
| | - Anthony Blaeser
- McColl-Lockwood Laboratory for Muscular Dystrophy Research, Cannon Research Center, Carolinas Medical Center, Atrium Health, Charlotte, NC 28203, USA
| | - Peijuan Lu
- McColl-Lockwood Laboratory for Muscular Dystrophy Research, Cannon Research Center, Carolinas Medical Center, Atrium Health, Charlotte, NC 28203, USA
| | - Victoria Leroy
- McColl-Lockwood Laboratory for Muscular Dystrophy Research, Cannon Research Center, Carolinas Medical Center, Atrium Health, Charlotte, NC 28203, USA
| | - Qi Long Lu
- McColl-Lockwood Laboratory for Muscular Dystrophy Research, Cannon Research Center, Carolinas Medical Center, Atrium Health, Charlotte, NC 28203, USA
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Yurchenco PD, McKee KK. Linker Protein Repair of LAMA2 Dystrophic Neuromuscular Basement Membranes. Front Mol Neurosci 2019; 12:305. [PMID: 31920536 PMCID: PMC6923227 DOI: 10.3389/fnmol.2019.00305] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2019] [Accepted: 11/26/2019] [Indexed: 12/18/2022] Open
Abstract
An understanding of basement membrane (BM) assembly at a molecular level provides a foundation with which to develop repair strategies for diseases with defects of BM structure. As currently understood, laminins become anchored to cell surfaces through receptor-mediated interactions and polymerize. This provisional matrix binds to proteoglycans, nidogens and type IV collagen to form a mature BM. Identification of BM binding domains and their binding targets has enabled investigators to engineer proteins that link BM components to modify and improve their functions. This approach is illustrated by the development of two linker proteins to repair the LAMA2-deficient muscular dystrophy (LAMA2-MD). Dystrophy-causing mutations of the LAMA2 gene product (Lmα2) disrupt the BM molecular architecture, destabilizing it. In a mild ambulatory type of the dystrophy, α2LN mutations in laminin-211 prevents polymerization. In the more common and severe non-ambulatory type (MDC1A), an absent Lmα2 subunit is replaced by the naturally occurring Lmα4 subunit that is normally largely confined to the microvasculature. The compensatory laminin, however, is a poor substitute because it neither polymerizes nor binds adequately to the anchoring receptor α-dystroglycan. A chimeric laminin-binding protein called αLNNd enables laminins with defective or absent αLN domains to polymerize while another engineered protein, miniagrin (mag), promotes efficient α-dystroglycan receptor-binding in otherwise weakly adhesive laminins. Alone, αLNNd enables Lm211 with a self-assembly defect to polymerize and was used to ameliorate a mouse model of the ambulatory dystrophy. Together, these linker proteins alter Lm411 such that it both polymerizes and binds αDG such that it properly assembles. This combination was used to ameliorate a mouse model of the non-ambulatory dystrophy in which Lm411 replaced Lm211 as seen in the human disease. Collectively, these studies pave the way for the development of somatic gene delivery of repair proteins for treatment of LAMA2-MD. The studies further suggest a more general approach of linker-protein mediated repair in which a variety of existing BM protein domains can be combined together to stabilize BMs in other diseases.
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Affiliation(s)
- Peter D Yurchenco
- Department of Pathology and Laboratory Medicine, Rutgers Robert Wood Johnson Medical School, Rutgers University, Piscataway, NJ, United States
| | - Karen K McKee
- Department of Pathology and Laboratory Medicine, Rutgers Robert Wood Johnson Medical School, Rutgers University, Piscataway, NJ, United States
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Fenwick AJ, Awinda PO, Yarbrough-Jones JA, Eldridge JA, Rodgers BD, Tanner BCW. Demembranated skeletal and cardiac fibers produce less force with altered cross-bridge kinetics in a mouse model for limb-girdle muscular dystrophy 2i. Am J Physiol Cell Physiol 2019; 317:C226-C234. [PMID: 31091146 DOI: 10.1152/ajpcell.00524.2018] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Limb-girdle muscular dystrophy 2i (LGMD2i) is a dystroglycanopathy that compromises myofiber integrity and primarily reduces power output in limb muscles but can influence cardiac muscle as well. Previous studies of LGMD2i made use of a transgenic mouse model in which a proline-to-leucine (P448L) mutation in fukutin-related protein severely reduces glycosylation of α-dystroglycan. Muscle function is compromised in P448L mice in a manner similar to human patients with LGMD2i. In situ studies reported lower maximal twitch force and depressed force-velocity curves in medial gastrocnemius (MG) muscles from male P448L mice. Here, we measured Ca2+-activated force generation and cross-bridge kinetics in both demembranated MG fibers and papillary muscle strips from P448L mice. Maximal activated tension was 37% lower in MG fibers and 18% lower in papillary strips from P448L mice than controls. We also found slightly faster rates of cross-bridge recruitment and detachment in MG fibers from P448L than control mice. These increases in skeletal cross-bridge cycling could reduce the unitary force output from individual cross bridges by lowering the ratio of time spent in a force-bearing state to total cycle time. This suggests that the decreased force production in LGMD2i may be due (at least in part) to altered cross-bridge kinetics. This finding is notable, as the majority of studies germane to muscular dystrophies have focused on sarcolemma or whole muscle properties, whereas our findings suggest that the disease pathology is also influenced by potential downstream effects on cross-bridge behavior.
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Affiliation(s)
- Axel J Fenwick
- Department of Integrative Physiology and Neuroscience, Washington State University , Pullman, Washington.,Washington Center for Muscle Biology, Washington State University , Pullman, Washington
| | - Peter O Awinda
- Department of Integrative Physiology and Neuroscience, Washington State University , Pullman, Washington.,Washington Center for Muscle Biology, Washington State University , Pullman, Washington
| | - Jacob A Yarbrough-Jones
- Department of Integrative Physiology and Neuroscience, Washington State University , Pullman, Washington.,Washington Center for Muscle Biology, Washington State University , Pullman, Washington
| | - Jennifer A Eldridge
- Department of Integrative Physiology and Neuroscience, Washington State University , Pullman, Washington.,Washington Center for Muscle Biology, Washington State University , Pullman, Washington
| | - Buel D Rodgers
- Washington Center for Muscle Biology, Washington State University , Pullman, Washington.,AAVogen, Inc. , Rockville, Maryland
| | - Bertrand C W Tanner
- Department of Integrative Physiology and Neuroscience, Washington State University , Pullman, Washington.,Washington Center for Muscle Biology, Washington State University , Pullman, Washington
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21
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Sudo A, Kanagawa M, Kondo M, Ito C, Kobayashi K, Endo M, Minami Y, Aiba A, Toda T. Temporal requirement of dystroglycan glycosylation during brain development and rescue of severe cortical dysplasia via gene delivery in the fetal stage. Hum Mol Genet 2019; 27:1174-1185. [PMID: 29360985 PMCID: PMC6159531 DOI: 10.1093/hmg/ddy032] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2017] [Accepted: 01/16/2018] [Indexed: 11/13/2022] Open
Abstract
Congenital muscular dystrophies (CMDs) are characterized by progressive weakness and degeneration of skeletal muscle. In several forms of CMD, abnormal glycosylation of α-dystroglycan (α-DG) results in conditions collectively known as dystroglycanopathies, which are associated with central nervous system involvement. We recently demonstrated that fukutin, the gene responsible for Fukuyama congenital muscular dystrophy, encodes the ribitol-phosphate transferase essential for dystroglycan function. Brain pathology in patients with dystroglycanopathy typically includes cobblestone lissencephaly, mental retardation, and refractory epilepsy; however, some patients exhibit average intelligence, with few or almost no structural defects. Currently, there is no effective treatment for dystroglycanopathy, and the mechanisms underlying the generation of this broad clinical spectrum remain unknown. Here, we analysed four distinct mouse models of dystroglycanopathy: two brain-selective fukutin conditional knockout strains (neuronal stem cell-selective Nestin-fukutin-cKO and forebrain-selective Emx1-fukutin-cKO), a FukutinHp strain with the founder retrotransposal insertion in the fukutin gene, and a spontaneous Large-mutant Largemyd strain. These models exhibit variations in the severity of brain pathology, replicating the clinical heterogeneity of dystroglycanopathy. Immunofluorescence analysis of the developing cortex suggested that residual glycosylation of α-DG at embryonic day 13.5 (E13.5), when cortical dysplasia is not yet apparent, may contribute to subsequent phenotypic heterogeneity. Surprisingly, delivery of fukutin or Large into the brains of mice at E12.5 prevented severe brain malformation in Emx1-fukutin-cKO and Largemyd/myd mice, respectively. These findings indicate that spatiotemporal persistence of functionally glycosylated α-DG may be crucial for brain development and modulation of glycosylation during the fetal stage could be a potential therapeutic strategy for dystroglycanopathy.
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Affiliation(s)
- Atsushi Sudo
- Division of Neurology/Molecular Brain Science, Kobe University Graduate School of Medicine, Kobe 650-0017, Japan
| | - Motoi Kanagawa
- Division of Neurology/Molecular Brain Science, Kobe University Graduate School of Medicine, Kobe 650-0017, Japan
| | - Mai Kondo
- Division of Neurology/Molecular Brain Science, Kobe University Graduate School of Medicine, Kobe 650-0017, Japan
| | - Chiyomi Ito
- Division of Neurology/Molecular Brain Science, Kobe University Graduate School of Medicine, Kobe 650-0017, Japan
| | - Kazuhiro Kobayashi
- Division of Neurology/Molecular Brain Science, Kobe University Graduate School of Medicine, Kobe 650-0017, Japan
| | - Mitsuharu Endo
- Division of Cell Physiology, Kobe University Graduate School of Medicine, Kobe 650-0017, Japan
| | - Yasuhiro Minami
- Division of Cell Physiology, Kobe University Graduate School of Medicine, Kobe 650-0017, Japan
| | - Atsu Aiba
- Laboratory of Animal Resources, Center for Disease Biology and Integrative Medicine, The University of Tokyo, Tokyo 113-0033, Japan
| | - Tatsushi Toda
- Division of Neurology/Molecular Brain Science, Kobe University Graduate School of Medicine, Kobe 650-0017, Japan.,Department of Neurology, Graduate School of Medicine, The University of Tokyo, Tokyo 113-0033, Japan
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22
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D'Andrea P, Sciancalepore M, Veltruska K, Lorenzon P, Bandiera A. Epidermal Growth Factor - based adhesion substrates elicit myoblast scattering, proliferation, differentiation and promote satellite cell myogenic activation. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2018; 1866:504-517. [PMID: 30343052 DOI: 10.1016/j.bbamcr.2018.10.012] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Revised: 10/12/2018] [Accepted: 10/16/2018] [Indexed: 12/19/2022]
Abstract
The biochemical properties of muscle extracellular matrix are essential for stem cell adhesion, motility, proliferation and myogenic development. Recombinant elastin-like polypeptides are synthetic polypeptides that, besides maintaining some properties of the native protein, can be tailored by fusing bioactive sequences to their C-terminal. Our laboratory synthesized several Human Elastin-Like Polypeptides (HELP) derived from the sequence of human tropoelastin. Here, we developed a novel HELP family member by fusing the elastin-like backbone to the sequence of human Epidermal Growth Factor. We employed this synthetic protein, named HEGF, either alone or in combination with other proteins of the HELP family carrying RGD-integrin binding sites, as adhesion substrate for C2C12 myoblasts and satellite cells primary cultures. Adhesion of myoblasts to HEGF-based substrates induced scattering, decreased adhesion and cytoskeleton assembly; the concomitant presence of the RGD motifs potentiated all these effects. Recombinant substrates induced myoblasts proliferation, differentiation and the development of multinucleated myotubes, thus favoring myoblasts expansion and preserving their myogenic potential. The effects induced by adhesion substrates were inhibited by AG82 (Tyrphostin 25) and herbimycin A, indicating their dependence on the activation of both the EGF receptor and the tyrosine kinase c-src. Finally, HEGF increased the number of muscle stem cells (satellite cells) derived from isolated muscle fibers in culture, thus highlighting its potential as a novel substrate for skeletal muscle regeneration strategies.
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Affiliation(s)
- Paola D'Andrea
- Department of Life Sciences, University of Trieste, I-34127 Trieste, Italy.
| | - Marina Sciancalepore
- Department of Life Sciences, University of Trieste, I-34127 Trieste, Italy; Centre for Neuroscience B.R.A.I.N., University of Trieste, I-34127 Trieste, Italy
| | - Katerina Veltruska
- Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University in Prague V Holešovičkách 747/2, Praha 8, Czech Republic
| | - Paola Lorenzon
- Department of Life Sciences, University of Trieste, I-34127 Trieste, Italy; Centre for Neuroscience B.R.A.I.N., University of Trieste, I-34127 Trieste, Italy
| | - Antonella Bandiera
- Department of Life Sciences, University of Trieste, I-34127 Trieste, Italy
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23
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Cataldi MP, Lu P, Blaeser A, Lu QL. Ribitol restores functionally glycosylated α-dystroglycan and improves muscle function in dystrophic FKRP-mutant mice. Nat Commun 2018; 9:3448. [PMID: 30150693 PMCID: PMC6110760 DOI: 10.1038/s41467-018-05990-z] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2017] [Accepted: 08/09/2018] [Indexed: 02/07/2023] Open
Abstract
O-mannosylated α-dystroglycan (α-DG) serves as receptors for cell-cell and cell-extracellular matrix adhesion and signaling. Hypoglycosylation of α-DG is involved in cancer progression and underlies dystroglycanopathy with aberrant neuronal development. Here we report that ribitol, a pentose alcohol with previously unknown function in mammalian cells, partially restores functional O-mannosylation of α-DG (F-α-DG) in the dystroglycanopathy model containing a P448L mutation in fukutin-related protein (FKRP) gene, which is clinically associated with severe congenital muscular dystrophy. Oral administration of ribitol increases levels of ribitol-5-phosphate and CDP-ribitol and restores therapeutic levels of F-α-DG in skeletal and cardiac muscles. Furthermore, ribitol, given before and after the onset of disease phenotype, reduces skeletal muscle pathology, significantly decreases cardiac fibrosis and improves skeletal and respiratory functions in the FKRP mutant mice. Ribitol treatment presents a new class, low risk, and easy to administer experimental therapy to restore F-α-DG in FKRP-related muscular dystrophy.
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Affiliation(s)
- Marcela P Cataldi
- McColl-Lockwood Laboratory for Muscular Dystrophy Research, Cannon Research Center, Carolinas Medical Center, Carolinas Healthcare System, Charlotte, NC, 28203, USA
| | - Peijuan Lu
- McColl-Lockwood Laboratory for Muscular Dystrophy Research, Cannon Research Center, Carolinas Medical Center, Carolinas Healthcare System, Charlotte, NC, 28203, USA
| | - Anthony Blaeser
- McColl-Lockwood Laboratory for Muscular Dystrophy Research, Cannon Research Center, Carolinas Medical Center, Carolinas Healthcare System, Charlotte, NC, 28203, USA
| | - Qi Long Lu
- McColl-Lockwood Laboratory for Muscular Dystrophy Research, Cannon Research Center, Carolinas Medical Center, Carolinas Healthcare System, Charlotte, NC, 28203, USA.
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24
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Zhang Y, Long C, Bassel-Duby R, Olson EN. Myoediting: Toward Prevention of Muscular Dystrophy by Therapeutic Genome Editing. Physiol Rev 2018; 98:1205-1240. [PMID: 29717930 PMCID: PMC6335101 DOI: 10.1152/physrev.00046.2017] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2017] [Revised: 12/22/2017] [Accepted: 12/26/2017] [Indexed: 12/22/2022] Open
Abstract
Muscular dystrophies represent a large group of genetic disorders that significantly impair quality of life and often progress to premature death. There is no effective treatment for these debilitating diseases. Most therapies, developed to date, focus on alleviating the symptoms or targeting the secondary effects, while the underlying gene mutation is still present in the human genome. The discovery and application of programmable nucleases for site-specific DNA double-stranded breaks provides a powerful tool for precise genome engineering. In particular, the CRISPR/Cas system has revolutionized the genome editing field and is providing a new path for disease treatment by targeting the disease-causing genetic mutations. In this review, we provide a historical overview of genome-editing technologies, summarize the most recent advances, and discuss potential strategies and challenges for permanently correcting genetic mutations that cause muscular dystrophies.
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Affiliation(s)
- Yu Zhang
- Department of Molecular Biology, Senator Paul D. Wellstone Muscular Dystrophy Cooperative Research Center and Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center , Dallas, Texas
| | - Chengzu Long
- Department of Molecular Biology, Senator Paul D. Wellstone Muscular Dystrophy Cooperative Research Center and Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center , Dallas, Texas
| | - Rhonda Bassel-Duby
- Department of Molecular Biology, Senator Paul D. Wellstone Muscular Dystrophy Cooperative Research Center and Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center , Dallas, Texas
| | - Eric N Olson
- Department of Molecular Biology, Senator Paul D. Wellstone Muscular Dystrophy Cooperative Research Center and Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center , Dallas, Texas
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25
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Yu Q, Morales M, Li N, Fritz AG, Ruobing R, Blaeser A, Francois E, Lu QL, Nagaraju K, Spurney CF. Skeletal, cardiac, and respiratory muscle function and histopathology in the P448Lneo- mouse model of FKRP-deficient muscular dystrophy. Skelet Muscle 2018; 8:13. [PMID: 29625576 PMCID: PMC5889611 DOI: 10.1186/s13395-018-0158-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2017] [Accepted: 03/20/2018] [Indexed: 01/17/2023] Open
Abstract
BACKGROUND Fukutin-related protein (FKRP) mutations are the most common cause of dystroglycanopathies known to cause both limb girdle and congenital muscular dystrophy. The P448Lneo- mouse model has a knock-in mutation in the FKRP gene and develops skeletal, respiratory, and cardiac muscle disease. METHODS We studied the natural history of the P448Lneo- mouse model over 9 months and the effects of twice weekly treadmill running. Forelimb and hindlimb grip strength (Columbus Instruments) and overall activity (Omnitech Electronics) assessed skeletal muscle function. Echocardiography was performed using VisualSonics Vevo 770 (FujiFilm VisualSonics). Plethysmography was performed using whole body system (ADInstruments). Histological evaluations included quantification of inflammation, fibrosis, central nucleation, and fiber size variation. RESULTS P448Lneo- mice had significantly increased normalized tissue weights compared to controls at 9 months of age for the heart, gastrocnemius, soleus, tibialis anterior, quadriceps, and triceps. There were no significant differences seen in forelimb or hindlimb grip strength or activity monitoring in P448Lneo- mice with or without exercise compared to controls. Skeletal muscles demonstrated increased inflammation, fibrosis, central nucleation, and variation in fiber size compared to controls (p < 0.05) and worsened with exercise. Plethysmography showed significant differences in respiratory rates and decreased tidal and minute volumes in P448Lneo- mice (p < 0.01). There was increased fibrosis in the diaphragm compared to controls (p < 0.01). Echocardiography demonstrated decreased systolic function in 9-month-old mutant mice (p < 0.01). There was increased myocardial wall thickness and mass (p < 0.001) with increased fibrosis in 9-month-old P448Lneo- mice compared to controls (p < 0.05). mRNA expression for natriuretic peptide type A (Nppa) was significantly increased in P448Lneo- mice compared to controls at 6 months (p < 0.05) and for natriuretic peptide type B (Nppb) at 6 and 9 months of age (p < 0.05). CONCLUSIONS FKRP-deficient P448Lneo- mice demonstrate significant deficits in cardiac and respiratory functions compared to control mice, and this is associated with increased inflammation and fibrosis. This study provides new functional outcome measures for preclinical trials of FKRP-related muscular dystrophies.
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Affiliation(s)
- Qing Yu
- Center for Genetic Medicine Research, Children's Research Institute, Children's National Health System, Washington, DC, USA
| | - Melissa Morales
- School of Pharmacy and Pharmaceutical Sciences, Binghamton University, State University of New York, Binghamton, NY, USA
| | - Ning Li
- School of Pharmacy and Pharmaceutical Sciences, Binghamton University, State University of New York, Binghamton, NY, USA
| | - Alexander G Fritz
- School of Pharmacy and Pharmaceutical Sciences, Binghamton University, State University of New York, Binghamton, NY, USA
| | - Ren Ruobing
- Department of Oncology, Ruijing Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Anthony Blaeser
- McColl-Lockwood Laboratory for Muscular Dystrophy Research, Department of Neurology, Carolinas Healthcare System, Charlotte, NC, USA
| | - Ershia Francois
- Center for Genetic Medicine Research, Children's Research Institute, Children's National Health System, Washington, DC, USA
| | - Qi-Long Lu
- McColl-Lockwood Laboratory for Muscular Dystrophy Research, Department of Neurology, Carolinas Healthcare System, Charlotte, NC, USA
| | - Kanneboyina Nagaraju
- School of Pharmacy and Pharmaceutical Sciences, Binghamton University, State University of New York, Binghamton, NY, USA
| | - Christopher F Spurney
- Children's National Heart Institute, Center for Genetic Medicine Research, Children's National Health System, Washington, DC, USA.
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26
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Tucker JD, Lu PJ, Xiao X, Lu QL. Overexpression of Mutant FKRP Restores Functional Glycosylation and Improves Dystrophic Phenotype in FKRP Mutant Mice. MOLECULAR THERAPY-NUCLEIC ACIDS 2018; 11:216-227. [PMID: 29858056 PMCID: PMC5992437 DOI: 10.1016/j.omtn.2018.02.008] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/17/2017] [Revised: 02/20/2018] [Accepted: 02/23/2018] [Indexed: 11/17/2022]
Abstract
Autosomal recessive homozygous or compound heterozygous mutations in FKRP result in forms of muscular dystrophy-dystroglycanopathy varying in age of onset, clinical presentation, and disease progression, ranging from the severe Walker-Warburg, type A,5 (MDDGA5), muscle-eye-brain (MDDGB5) with or without cognitive deficit, to limb-girdle type 2I (MDDGC5). Phenotypic variation indicates degrees of functionality of individual FKRP mutation, which has been supported by the presence of residual expression of functionally glycosylated α-dystroglycan (DG) in muscles of both animal models and patients. However, direct evidence showing enhancement in glycosylation of α-DG by mutant FKRP is lacking. Using AAV9-mediated overexpression of mutant human FKRP bearing the P448L mutation (mhFKRP-P448L) associated with severe congenital muscular dystrophy (CMD), we demonstrate the restoration of functional glycosylation of α-DG and reduction in markers of disease progression. Expression of mhFKRP-P448L also corrects dystrophic phenotypes in the models of L276I mutation with mild disease phenotype and causes no obvious histological or biomarker alteration in C57BL/6 normal mice. Our results confirm the existing function of mutant FKRP. The results also suggest that mutant FKRP could be an alternative approach for potential gene therapy should normal FKRP gene products be immunogenic.
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Affiliation(s)
- Jason D Tucker
- McColl-Lockwood Laboratory for Muscular Dystrophy Research, James G. Cannon Research Center, Carolinas Medical Center, Charlotte, NC 28203, USA
| | - Pei J Lu
- McColl-Lockwood Laboratory for Muscular Dystrophy Research, James G. Cannon Research Center, Carolinas Medical Center, Charlotte, NC 28203, USA
| | - Xiao Xiao
- Division of Molecular Pharmaceutics, Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Qi L Lu
- McColl-Lockwood Laboratory for Muscular Dystrophy Research, James G. Cannon Research Center, Carolinas Medical Center, Charlotte, NC 28203, USA.
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27
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Butterfield RJ, Dunn DM, Hu Y, Johnson K, Bönnemann CG, Weiss RB. Transcriptome profiling identifies regulators of pathogenesis in collagen VI related muscular dystrophy. PLoS One 2017; 12:e0189664. [PMID: 29244830 PMCID: PMC5731705 DOI: 10.1371/journal.pone.0189664] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2017] [Accepted: 11/29/2017] [Indexed: 11/30/2022] Open
Abstract
Objectives The collagen VI related muscular dystrophies (COL6-RD), Ullrich congenital muscular dystrophy (UCMD) and Bethlem myopathy (BM) are among the most common congenital muscular dystrophies and are characterized by distal joint laxity and a combination of distal and proximal joint contractures. Inheritance can be dominant negative (DN) or recessive depending on the type and location of the mutation. DN mutations allow incorporation of abnormal chains into secreted tetramers and are the most commonly identified mutation type in COL6-RD. Null alleles (nonsense, frameshift, and large deletions) do not allow incorporation of abnormal chains and act recessively. To better define the pathways disrupted by mutations in collagen VI, we have used a transcriptional profiling approach with RNA-Seq to identify differentially expressed genes in COL6-RD individuals from controls. Methods RNA-Seq allows precise detection of all expressed transcripts in a sample and provides a tool for quantification of expression data on a genomic scale. We have used RNA-Seq to identify differentially expressed genes in cultured dermal fibroblasts from 13 COL6-RD individuals (8 dominant negative and 5 null) and 6 controls. To better assess the transcriptional changes induced by abnormal collagen VI in the extracellular matrix (ECM); we compared transcriptional profiles from subjects with DN mutations and subjects with null mutations to transcriptional profiles from controls. Results Differentially expressed transcripts between COL6-RD and control fibroblasts include upregulation of ECM components and downregulation of factors controlling matrix remodeling and repair. DN and null samples are differentiated by downregulation of genes involved with DNA replication and repair in null samples. Conclusions Differentially expressed genes identified here may help identify new targets for development of therapies and biomarkers to assess the efficacy of treatments.
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Affiliation(s)
- Russell J. Butterfield
- University of Utah, Departments of Pediatrics and Neurology, Salt Lake City, Utah, United States of America
- * E-mail:
| | - Diane M. Dunn
- University of Utah, Department of Human Genetics, Salt Lake City, Utah, United States of America
| | - Ying Hu
- Neurogenetics Branch, National Institute of Neurological Disorders and Stroke, NIH, Bethesda, Maryland, United States of America
| | - Kory Johnson
- Bioinformatics section, National Institute of Neurological Disorders and Stroke, NIH, Bethesda, Maryland, United States of America
| | - Carsten G. Bönnemann
- Neurogenetics Branch, National Institute of Neurological Disorders and Stroke, NIH, Bethesda, Maryland, United States of America
| | - Robert B. Weiss
- University of Utah, Department of Human Genetics, Salt Lake City, Utah, United States of America
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28
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Tempol Supplementation Restores Diaphragm Force and Metabolic Enzyme Activities in mdx Mice. Antioxidants (Basel) 2017; 6:antiox6040101. [PMID: 29210997 PMCID: PMC5745511 DOI: 10.3390/antiox6040101] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2017] [Revised: 11/19/2017] [Accepted: 11/28/2017] [Indexed: 12/29/2022] Open
Abstract
Duchenne muscular dystrophy (DMD) is characterized by striated muscle weakness, cardiomyopathy, and respiratory failure. Since oxidative stress is recognized as a secondary pathology in DMD, the efficacy of antioxidant intervention, using the superoxide scavenger tempol, was examined on functional and biochemical status of dystrophin-deficient diaphragm muscle. Diaphragm muscle function was assessed, ex vivo, in adult male wild-type and dystrophin-deficient mdx mice, with and without a 14-day antioxidant intervention. The enzymatic activities of muscle citrate synthase, phosphofructokinase, and lactate dehydrogenase were assessed using spectrophotometric assays. Dystrophic diaphragm displayed mechanical dysfunction and altered biochemical status. Chronic tempol supplementation in the drinking water increased diaphragm functional capacity and citrate synthase and lactate dehydrogenase enzymatic activities, restoring all values to wild-type levels. Chronic supplementation with tempol recovers force-generating capacity and metabolic enzyme activity in mdx diaphragm. These findings may have relevance in the search for therapeutic strategies in neuromuscular disease.
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29
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Suchyna TM. Piezo channels and GsMTx4: Two milestones in our understanding of excitatory mechanosensitive channels and their role in pathology. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2017; 130:244-253. [PMID: 28778608 DOI: 10.1016/j.pbiomolbio.2017.07.011] [Citation(s) in RCA: 61] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2017] [Revised: 07/17/2017] [Accepted: 07/21/2017] [Indexed: 12/19/2022]
Abstract
Discovery of Piezo channels and the reporting of their sensitivity to the inhibitor GsMTx4 were important milestones in the study of non-selective cationic mechanosensitive channels (MSCs) in normal physiology and pathogenesis. GsMTx4 had been used for years to investigate the functional role of cationic MSCs, especially in muscle tissue, but with little understanding of its target or inhibitory mechanism. The sensitivity of Piezo channels to bilayer stress and its robust mechanosensitivity when expressed in heterologous systems were keys to determining GsMTx4's mechanism of action. However, questions remain regarding Piezo's role in muscle function due to the non-selective nature of GsMTx4 inhibition toward membrane mechanoenzymes and the implication of MCS channel types by genetic knockdown. Evidence supporting Piezo like activity, at least in the developmental stages of muscle, is presented. While the MSC targets of GsMTx4 in muscle pathology are unclear, its muscle protective effects are clearly demonstrated in two recent in situ studies on normal cardiomyocytes and dystrophic skeletal muscle. The muscle protective function may be due to the combined effect of GsMTx4's inhibitory action on cationic MSCs like Piezo and TRP, and its potentiation of repolarizing K+ selective MSCs like K2P and SAKCa. Paradoxically, the potent in vitro action of GsMTx4 on many physiological functions seems to conflict with its lack of in situ side-effects on normal animal physiology. Future investigations into cytoskeletal control of sarcolemma mechanics and the suspected inclusion of MSCs in membrane micro/nano sized domains with distinct mechanical properties will aide our understanding of this dichotomy.
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Affiliation(s)
- Thomas M Suchyna
- University of Buffalo, Dept. of Physiology and Biophysics, Buffalo, NY, USA.
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30
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Keramaris E, Lu PJ, Tucker J, Lu QL. Expression of glycosylated α-dystroglycan in newborn skeletal and cardiac muscles of fukutin related protein (FKRP) mutant mice. Muscle Nerve 2016; 55:582-590. [DOI: 10.1002/mus.25378] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Revised: 08/05/2016] [Accepted: 08/10/2016] [Indexed: 12/27/2022]
Affiliation(s)
- Elizabeth Keramaris
- McColl-Lockwood Laboratory for Muscular Dystrophy Research; Cannon Research Center, Carolinas Medical Center; 1542 Garden Terrace Charlotte North Carolina 28203 USA
| | - Pei J. Lu
- McColl-Lockwood Laboratory for Muscular Dystrophy Research; Cannon Research Center, Carolinas Medical Center; 1542 Garden Terrace Charlotte North Carolina 28203 USA
| | - Jason Tucker
- McColl-Lockwood Laboratory for Muscular Dystrophy Research; Cannon Research Center, Carolinas Medical Center; 1542 Garden Terrace Charlotte North Carolina 28203 USA
| | - Qi L. Lu
- McColl-Lockwood Laboratory for Muscular Dystrophy Research; Cannon Research Center, Carolinas Medical Center; 1542 Garden Terrace Charlotte North Carolina 28203 USA
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31
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Blaeser A, Awano H, Wu B, Lu QL. Progressive Dystrophic Pathology in Diaphragm and Impairment of Cardiac Function in FKRP P448L Mutant Mice. PLoS One 2016; 11:e0164187. [PMID: 27711214 PMCID: PMC5053477 DOI: 10.1371/journal.pone.0164187] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2016] [Accepted: 09/21/2016] [Indexed: 01/22/2023] Open
Abstract
Mutations in the gene for fukutin-related protein represent a subset of muscular dystrophies known as dystroglycanopathies characterized by loss of functionally-glycosylated-alpha-dystroglycan and a wide range of dystrophic phenotypes. Mice generated by our lab containing the P448L mutation in the fukutin-related protein gene demonstrate the dystrophic phenotype similar to that of LGMD2I. Here we examined the morphology of the heart and diaphragm, focusing on pathology of diaphragm and cardiac function of the mutant mice for up to 12 months. Both diaphragm and heart lack clear expression of functionally-glycosylated-alpha-dystroglycan throughout the observed period. The diaphragm undergoes progressive deterioration in histology with increasing amount of centranucleation and inflammation. Large areas of mononuclear cell infiltration and fibrosis of up to 60% of tissue area were detected as early as 6 months of age. Despite a less severe morphology with only patches of mononuclear cell infiltration and fibrosis of ~5% by 12 months of age in the heart, cardiac function is clearly affected. High frequency ultrasound reveals a smaller heart size up to 10 months of age. There are significant increases in myocardial thickness and decrease in cardiac output through 12 months. Dysfunction in the heart represents a key marker for evaluating experimental therapies aimed at cardiac muscle.
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Affiliation(s)
- Anthony Blaeser
- McColl-Lockwood Laboratory for Muscular Dystrophy Research, Cannon Research Center, Carolinas Medical Center, 1000 Blythe Blvd., Charlotte, NC 28203, United States of America
- * E-mail: (AB); (QLL)
| | - Hiroyuki Awano
- McColl-Lockwood Laboratory for Muscular Dystrophy Research, Cannon Research Center, Carolinas Medical Center, 1000 Blythe Blvd., Charlotte, NC 28203, United States of America
| | - Bo Wu
- McColl-Lockwood Laboratory for Muscular Dystrophy Research, Cannon Research Center, Carolinas Medical Center, 1000 Blythe Blvd., Charlotte, NC 28203, United States of America
| | - Qi-Long Lu
- McColl-Lockwood Laboratory for Muscular Dystrophy Research, Cannon Research Center, Carolinas Medical Center, 1000 Blythe Blvd., Charlotte, NC 28203, United States of America
- * E-mail: (AB); (QLL)
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Rieff HI, Drugan JK, Cheever TR, Van't Veer A, Nuckolls GH, Katz SI. The muscular dystrophy coordinating committee action plan for the muscular dystrophies. Muscle Nerve 2016; 53:839-41. [PMID: 26999713 DOI: 10.1002/mus.25111] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/18/2016] [Indexed: 11/07/2022]
Affiliation(s)
- Heather I Rieff
- National Institute of Neurological Disorders and Stroke, National Institutes of Health, 6001 Executive Boulevard, Neuroscience Center, Room 2203, Bethesda, Maryland, 20892, USA
| | - Jonelle K Drugan
- National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, Maryland, USA
| | - Thomas R Cheever
- National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, Maryland, USA
| | - Ashlee Van't Veer
- National Institute of Neurological Disorders and Stroke, National Institutes of Health, 6001 Executive Boulevard, Neuroscience Center, Room 2203, Bethesda, Maryland, 20892, USA
| | - Glen H Nuckolls
- National Institute of Neurological Disorders and Stroke, National Institutes of Health, 6001 Executive Boulevard, Neuroscience Center, Room 2203, Bethesda, Maryland, 20892, USA
| | - Stephen I Katz
- National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, Maryland, USA
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Schindler RFR, Scotton C, Zhang J, Passarelli C, Ortiz-Bonnin B, Simrick S, Schwerte T, Poon KL, Fang M, Rinné S, Froese A, Nikolaev VO, Grunert C, Müller T, Tasca G, Sarathchandra P, Drago F, Dallapiccola B, Rapezzi C, Arbustini E, Di Raimo FR, Neri M, Selvatici R, Gualandi F, Fattori F, Pietrangelo A, Li W, Jiang H, Xu X, Bertini E, Decher N, Wang J, Brand T, Ferlini A. POPDC1(S201F) causes muscular dystrophy and arrhythmia by affecting protein trafficking. J Clin Invest 2015; 126:239-53. [PMID: 26642364 DOI: 10.1172/jci79562] [Citation(s) in RCA: 65] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2014] [Accepted: 10/29/2015] [Indexed: 01/16/2023] Open
Abstract
The Popeye domain-containing 1 (POPDC1) gene encodes a plasma membrane-localized cAMP-binding protein that is abundantly expressed in striated muscle. In animal models, POPDC1 is an essential regulator of structure and function of cardiac and skeletal muscle; however, POPDC1 mutations have not been associated with human cardiac and muscular diseases. Here, we have described a homozygous missense variant (c.602C>T, p.S201F) in POPDC1, identified by whole-exome sequencing, in a family of 4 with cardiac arrhythmia and limb-girdle muscular dystrophy (LGMD). This allele was absent in known databases and segregated with the pathological phenotype in this family. We did not find the allele in a further screen of 104 patients with a similar phenotype, suggesting this mutation to be family specific. Compared with WT protein, POPDC1(S201F) displayed a 50% reduction in cAMP affinity, and in skeletal muscle from patients, both POPDC1(S201F) and WT POPDC2 displayed impaired membrane trafficking. Forced expression of POPDC1(S201F) in a murine cardiac muscle cell line (HL-1) increased hyperpolarization and upstroke velocity of the action potential. In zebrafish, expression of the homologous mutation (popdc1(S191F)) caused heart and skeletal muscle phenotypes that resembled those observed in patients. Our study therefore identifies POPDC1 as a disease gene causing a very rare autosomal recessive cardiac arrhythmia and LGMD, expanding the genetic causes of this heterogeneous group of inherited rare diseases.
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Radev Z, Hermel JM, Elipot Y, Bretaud S, Arnould S, Duchateau P, Ruggiero F, Joly JS, Sohm F. A TALEN-Exon Skipping Design for a Bethlem Myopathy Model in Zebrafish. PLoS One 2015. [PMID: 26221953 PMCID: PMC4519248 DOI: 10.1371/journal.pone.0133986] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Presently, human collagen VI-related diseases such as Ullrich congenital muscular dystrophy (UCMD) and Bethlem myopathy (BM) remain incurable, emphasizing the need to unravel their etiology and improve their treatments. In UCMD, symptom onset occurs early, and both diseases aggravate with ageing. In zebrafish fry, morpholinos reproduced early UCMD and BM symptoms but did not allow to study the late phenotype. Here, we produced the first zebrafish line with the human mutation frequently found in collagen VI-related disorders such as UCMD and BM. We used a transcription activator-like effector nuclease (TALEN) to design the col6a1ama605003-line with a mutation within an essential splice donor site, in intron 14 of the col6a1 gene, which provoke an in-frame skipping of exon 14 in the processed mRNA. This mutation at a splice donor site is the first example of a template-independent modification of splicing induced in zebrafish using a targetable nuclease. This technique is readily expandable to other organisms and can be instrumental in other disease studies. Histological and ultrastructural analyzes of homozygous and heterozygous mutant fry and 3 months post-fertilization (mpf) fish revealed co-dominantly inherited abnormal myofibers with disorganized myofibrils, enlarged sarcoplasmic reticulum, altered mitochondria and misaligned sarcomeres. Locomotion analyzes showed hypoxia-response behavior in 9 mpf col6a1 mutant unseen in 3 mpf fish. These symptoms worsened with ageing as described in patients with collagen VI deficiency. Thus, the col6a1ama605003-line is the first adult zebrafish model of collagen VI-related diseases; it will be instrumental both for basic research and drug discovery assays focusing on this type of disorders.
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Affiliation(s)
- Zlatko Radev
- UMS 1374, AMAGEN, INRA, Jouy en Josas, Domaine de Vilvert, France
- UMS 3504, AMAGEN, CNRS, Gif-sur-Yvette, France
| | - Jean-Michel Hermel
- UMR 9197, INRA-CASBAH team, NEURO-Psi, CNRS, Gif sur Yvette, France
- * E-mail: (FS); (JMH)
| | - Yannick Elipot
- UMR 9197, DECA team, NEURO-Psi, CNRS, Gif sur Yvette, France
| | - Sandrine Bretaud
- UMR 5242, Institut de Génomique Fonctionnelle de Lyon, ENS de Lyon, CNRS, Université Lyon 1, Lyon, France
| | | | | | - Florence Ruggiero
- UMR 5242, Institut de Génomique Fonctionnelle de Lyon, ENS de Lyon, CNRS, Université Lyon 1, Lyon, France
| | | | - Frédéric Sohm
- UMS 1374, AMAGEN, INRA, Jouy en Josas, Domaine de Vilvert, France
- UMS 3504, AMAGEN, CNRS, Gif-sur-Yvette, France
- * E-mail: (FS); (JMH)
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Restoration of Functional Glycosylation of α-Dystroglycan in FKRP Mutant Mice Is Associated with Muscle Regeneration. THE AMERICAN JOURNAL OF PATHOLOGY 2015; 185:2025-37. [DOI: 10.1016/j.ajpath.2015.03.017] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2014] [Revised: 03/19/2015] [Accepted: 03/23/2015] [Indexed: 11/19/2022]
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Awano H, Blaeser A, Wu B, Lu P, Keramaris-Vrantsis E, Lu Q. Dystroglycanopathy muscles lacking functional glycosylation of alpha-dystroglycan retain regeneration capacity. Neuromuscul Disord 2015; 25:474-84. [PMID: 25937147 DOI: 10.1016/j.nmd.2015.03.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2014] [Revised: 02/03/2015] [Accepted: 03/11/2015] [Indexed: 12/27/2022]
Abstract
In dystroglycanopathies, lack of glycosylated alpha-dystroglycan (α-DG) alters membrane fragility leading to fiber damage and repetitive cycles of muscle degeneration and regeneration. However the effect of the glycosylation of α-DG on muscle regeneration is not clearly understood. In this study, we examined the regenerative capacity of dystrophic muscles in vivo in FKRP mutant and LARGE(myd) mice with little and complete lack of functionally glycosylated α-DG (F-α-DG) respectively. The number of regenerating fibers expressing embryonic myosin heavy chain (eMyHC) in the diseased muscles up to the age of 10 months is higher than or at similar levels to wild type muscle after notexin and polyethyleminine insults. The process of fiber maturation is not significantly affected by the lack of F-α-DG assessed by size distribution. The earlier appearance of a larger number of regenerating fibers after injury is consistent with the observation that the populations of myogenic satellite cells are increased and being readily activated in the dystroglycanopathy muscles. F-α-DG is expressed at trace amounts in undifferentiated myoblasts, but increases in differentiated myotubes in vitro. We therefore conclude that muscle regeneration is not impaired in the early stage of the dystroglycanopathies, and F-α-DG does not play a significant role in myogenic cell proliferation and fiber formation and maturation.
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Affiliation(s)
- Hiroyuki Awano
- McColl-Lockwood Laboratory for Muscular Dystrophy Research, Cannon Research Center, Carolinas Medical Center, 1000 Blythe Blvd, Charlotte, NC 28203, USA
| | - Anthony Blaeser
- McColl-Lockwood Laboratory for Muscular Dystrophy Research, Cannon Research Center, Carolinas Medical Center, 1000 Blythe Blvd, Charlotte, NC 28203, USA
| | - Bo Wu
- McColl-Lockwood Laboratory for Muscular Dystrophy Research, Cannon Research Center, Carolinas Medical Center, 1000 Blythe Blvd, Charlotte, NC 28203, USA
| | - Pei Lu
- McColl-Lockwood Laboratory for Muscular Dystrophy Research, Cannon Research Center, Carolinas Medical Center, 1000 Blythe Blvd, Charlotte, NC 28203, USA
| | - Elizabeth Keramaris-Vrantsis
- McColl-Lockwood Laboratory for Muscular Dystrophy Research, Cannon Research Center, Carolinas Medical Center, 1000 Blythe Blvd, Charlotte, NC 28203, USA
| | - Qi Lu
- McColl-Lockwood Laboratory for Muscular Dystrophy Research, Cannon Research Center, Carolinas Medical Center, 1000 Blythe Blvd, Charlotte, NC 28203, USA.
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Alemdaroğlu I, Karaduman A, Yilmaz ÖT, Topaloğlu H. Different types of upper extremity exercise training in Duchenne muscular dystrophy: Effects on functional performance, strength, endurance, and ambulation. Muscle Nerve 2015; 51:697-705. [DOI: 10.1002/mus.24451] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/02/2014] [Indexed: 01/30/2023]
Affiliation(s)
- Ipek Alemdaroğlu
- Faculty of Health Sciences; Physiotherapy and Rehabilitation Department; Bezmialem Vakıf University; Fatih Istanbul Turkey
| | - Ayşe Karaduman
- Faculty of Health Sciences; Physiotherapy and Rehabilitation Department; Hacettepe University; Ankara Turkey
| | - Öznur Tunca Yilmaz
- Faculty of Health Sciences; Physiotherapy and Rehabilitation Department; Hacettepe University; Ankara Turkey
| | - Haluk Topaloğlu
- İhsan Doğramacı Children Hospital; Pediatric Neurology Department; Hacettepe University; Ankara Turkey
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38
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van Bruggen HW, Van Den Engel-Hoek L, Steenks MH, Bronkhorst EM, Creugers NHJ, de Groot IJM, Kalaykova SI. Reduced mandibular range of motion in Duchenne Muscular Dystrophy: predictive factors. J Oral Rehabil 2015; 42:430-8. [PMID: 25600935 DOI: 10.1111/joor.12274] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/22/2014] [Indexed: 11/26/2022]
Abstract
Patients with Duchenne muscular dystrophy (DMD) experience negative effects upon feeding and oral health. We aimed to determine whether the mandibular range of motion in DMD is impaired and to explore predictive factors for the active maximum mouth opening (aMMO). 23 patients with DMD (mean age 16.7 ± 7.7 years) and 23 controls were assessed using a questionnaire about mandibular function and impairments. All participants underwent a clinical examination of the masticatory system, including measurement of mandibular range of motion and variables related to mandibular movements. In all patients, quantitative ultrasound of the digastric muscle and the geniohyoid muscle and the motor function measure (MFM) scale were performed. The patients were divided into early and late ambulatory stage (AS), early non-ambulatory stage (ENAS) and late non-ambulatory stage (LNAS). All mandibular movements were reduced in the patient group (P < 0.001) compared to the controls. Reduction in the aMMO (<40 mm) was found in 26% of the total patient group. LNAS patients had significantly smaller mandibular movements compared to AS and ENAS (P < 0.05). Multiple linear regression analysis for aMMO revealed a positive correlation with the body height and disease progression, with MFM total score as the strongest independent risk factor (R(2) = 0.71). Mandibular movements in DMD are significantly reduced and become more hampered with loss of motor function, including the sitting position, arm function, and neck and head control. We suggest that measurement of the aMMO becomes a part of routine care of patients with DMD.
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Affiliation(s)
- H W van Bruggen
- Department of Oral Function and Prosthetic Dentistry, College of Dental Science, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands; Department of Oral-Maxillofacial Surgery, Prosthodontics and Special Dental Care, University Medical Center, Utrecht, The Netherlands
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Toda T. [The Cutting-edge of Medicine; Recent development of therapy for muscular dystrophy]. NIHON NAIKA GAKKAI ZASSHI. THE JOURNAL OF THE JAPANESE SOCIETY OF INTERNAL MEDICINE 2014; 103:2820-2828. [PMID: 27522825 DOI: 10.2169/naika.103.2820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
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Subramanian A, Schilling TF. Thrombospondin-4 controls matrix assembly during development and repair of myotendinous junctions. eLife 2014; 3. [PMID: 24941943 PMCID: PMC4096842 DOI: 10.7554/elife.02372] [Citation(s) in RCA: 87] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2014] [Accepted: 06/17/2014] [Indexed: 12/13/2022] Open
Abstract
Tendons are extracellular matrix (ECM)-rich structures that mediate muscle attachments with the skeleton, but surprisingly little is known about molecular mechanisms of attachment. Individual myofibers and tenocytes in Drosophila interact through integrin (Itg) ligands such as Thrombospondin (Tsp), while vertebrate muscles attach to complex ECM fibrils embedded with tenocytes. We show for the first time that a vertebrate thrombospondin, Tsp4b, is essential for muscle attachment and ECM assembly at myotendinous junctions (MTJs). Tsp4b depletion in zebrafish causes muscle detachment upon contraction due to defects in laminin localization and reduced Itg signaling at MTJs. Mutation of its oligomerization domain renders Tsp4b unable to rescue these defects, demonstrating that pentamerization is required for ECM assembly. Furthermore, injected human TSP4 localizes to zebrafish MTJs and rescues muscle detachment and ECM assembly in Tsp4b-deficient embryos. Thus Tsp4 functions as an ECM scaffold at MTJs, with potential therapeutic uses in tendon strengthening and repair. DOI:http://dx.doi.org/10.7554/eLife.02372.001 Tendons, the tough connective tissues that link muscles to bones, are essential for lifting, running and other movements in animals. A matrix of proteins, called the extracellular matrix, connects the cells in a tendon, giving it the strength it needs to prevent muscles from detaching from bones during strenuous activities. To achieve this strength, extracellular matrix proteins bind to one another and to receptors on the muscle cell surface that are linked to its internal scaffolding, thereby organizing other proteins into a structure called a myotendinous junction. However, despite the essential roles of tendons, scientists do not fully understand how this organization occurs, or how it can go awry. Subramanian and Schilling screened zebrafish for genes that are essential for proper muscle attachment, and zeroed in on a gene encoding a protein called Thrombospondin-4b (Tsp4b). A similar protein helps to connect muscle and tendon cells in fruit flies. Without Tsp4b, zebrafish are able to form connections between muscles and tendons, but the muscles detach easily during movement. This weakened connection is caused by disorganization of the proteins in the extracellular matrix, which results in reduced signaling from the muscle cell receptors. When a human form of this protein was injected into zebrafish embryos lacking Tsp4b, it settled into the junctions between muscle and tendon cells. The human protein repaired the detached muscles and restored the proper organization of the matrix. This improved the strength of the muscle-tendon attachment in the treated fish embryos, suggesting that similar injections could also help to strengthen and repair muscles and tendons in people. DOI:http://dx.doi.org/10.7554/eLife.02372.002
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Affiliation(s)
- Arul Subramanian
- Department of Developmental and Cell Biology, University of California, Irvine, Irvine, United States
| | - Thomas F Schilling
- Department of Developmental and Cell Biology, University of California, Irvine, Irvine, United States
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Raeker MÖ, Shavit JA, Dowling JJ, Michele DE, Russell MW. Membrane-myofibril cross-talk in myofibrillogenesis and in muscular dystrophy pathogenesis: lessons from the zebrafish. Front Physiol 2014; 5:14. [PMID: 24478725 PMCID: PMC3904128 DOI: 10.3389/fphys.2014.00014] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2013] [Accepted: 01/07/2014] [Indexed: 11/16/2022] Open
Abstract
Striated muscle has a highly ordered structure in which specialized domains of the cell membrane involved in force transmission (costameres) and excitation-contraction coupling (T tubules) as well as the internal membranes of the sarcoplasmic reticulum are organized over specific regions of the sarcomere. Optimal muscle function is dependent on this high level of organization but how it established and maintained is not well understood. Due to its ex utero development and transparency, the zebrafish embryo is an excellent vertebrate model for the study of dynamic relationships both within and between cells during development. Transgenic models have allowed the delineation of cellular migration and complex morphogenic rearrangements during the differentiation of skeletal myocytes and the assembly and organization of new myofibrils. Molecular targeting of genes and transcripts has allowed the identification of key requirements for myofibril assembly and organization. With the recent advances in gene editing approaches, the zebrafish will become an increasingly important model for the study of human myopathies and muscular dystrophies. Its high fecundity and small size make it well suited to high-throughput screenings to identify novel pharmacologic and molecular therapies for the treatment of a broad range of neuromuscular conditions. In this review, we examine the lessons learned from the zebrafish model regarding the complex interactions between the sarcomere and the sarcolemma that pattern the developing myocyte and discuss the potential for zebrafish as a model system to examine the pathophysiology of, and identify new treatments for, human myopathies and muscular dystrophies.
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Affiliation(s)
- Maide Ö Raeker
- Division of Pediatric Cardiology, Department of Pediatrics and Communicable Diseases, University of Michigan Ann Arbor, MI, USA
| | - Jordan A Shavit
- Pediatric Hematology and Oncology, Department of Pediatrics and Communicable Diseases, University of Michigan Ann Arbor, MI, USA
| | - James J Dowling
- Division of Pediatric Neurology, Department of Pediatrics, The Hospital for Sick Children Toronto, Ontario, CA, USA
| | - Daniel E Michele
- Department of Molecular and Integrative Physiology, University of Michigan Ann Arbor, MI, USA
| | - Mark W Russell
- Division of Pediatric Cardiology, Department of Pediatrics and Communicable Diseases, University of Michigan Ann Arbor, MI, USA
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G R, M Z, R T. Facioscapulohumeral Muscular Dystrophy: More Complex than it Appears. Curr Mol Med 2014; 14:1052-1068. [PMID: 25323867 PMCID: PMC4264243 DOI: 10.2174/1566524014666141010155054] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2013] [Revised: 05/20/2014] [Accepted: 07/25/2014] [Indexed: 02/07/2023]
Abstract
Facioscapulohumeral muscular dystrophy (FSHD) has been classified as an autosomal dominant myopathy, linked to rearrangements in an array of 3.3 kb tandemly repeated DNA elements (D4Z4) located at the 4q subtelomere (4q35). For the last 20 years, the diagnosis of FSHD has been confirmed in clinical practice by the detection of one D4Z4 allele with a reduced number (≤8) of repeats at 4q35. Although wide inter- and intra-familial clinical variability was found in subjects carrying D4Z4 alleles of reduced size, this DNA testing has been considered highly sensitive and specific. However, several exceptions to this general rule have been reported. Specifically, FSHD families with asymptomatic relatives carrying D4Z4 reduced alleles, FSHD genealogies with subjects affected with other neuromuscular disorders and FSHD affected patients carrying D4Z4 alleles of normal size have been described. In order to explain these findings, it has been proposed that the reduction of D4Z4 repeats at 4q35 could be pathogenic only in certain chromosomal backgrounds, defined as "permissive" specific haplotypes. However, our most recent studies show that the current DNA signature of FSHD is a common polymorphism and that in FSHD families the risk of developing FSHD for carriers of D4Z4 reduced alleles (DRA) depends on additional factors besides the 4q35 locus. These findings highlight the necessity to re-evaluate the significance and the predictive value of DRA, not only for research but also in clinical practice. Further clinical and genetic analysis of FSHD families will be extremely important for studies aiming at dissecting the complexity of FSHD.
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Affiliation(s)
- Ricci G
- Department of Life Sciences, “Miogen” Laboratory, University of Modena and Reggio Emilia, Modena, Italy
- Department of Clinical and Experimental Medicine, Section of Neurology, University of Pisa, Pisa, Italy
| | - Zatz M
- Human Genome Research and Stem Cell Center, Institute of Biosciences, University of São Paulo, São Paulo 05508-090, Brazil
| | - Tupler R
- Department of Life Sciences, “Miogen” Laboratory, University of Modena and Reggio Emilia, Modena, Italy
- Program in Gene Function and Expression, University of Massachusetts Medical School, 364 Plantation Street, Worcester, MA 01605, USA
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Matthews PM, Edison P, Geraghty OC, Johnson MR. The emerging agenda of stratified medicine in neurology. Nat Rev Neurol 2013; 10:15-26. [DOI: 10.1038/nrneurol.2013.245] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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44
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Horiuchi N, Aihara N, Mizutani H, Kousaka S, Nagafuchi T, Ochiai M, Ochiai K, Kobayashi Y, Furuoka H, Asai T, Oishi K. Becker muscular dystrophy-like myopathy regarded as so-called "fatty muscular dystrophy" in a pig: a case report and its diagnostic method. J Vet Med Sci 2013; 76:243-8. [PMID: 24162004 PMCID: PMC3982806 DOI: 10.1292/jvms.13-0336] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
Abstract
We describe a case of human Becker muscular dystrophy (BMD)-like myopathy that was characterized by the declined stainability of dystrophin at sarcolemma in a pig and the immunostaining for dystrophin on the formalin-fixed, paraffin-embedded (FFPE) tissue. The present case was found in a meat inspection center. The pig looked appeared healthy at the ante-mortem inspection. Muscular abnormalities were detected after carcass dressing as pale, discolored skeletal muscles with prominent fat infiltrations and considered so-called “fatty muscular dystrophy”. Microscopic examination revealed following characteristics: diffused fat infiltration into the skeletal muscle and degeneration and regeneration of the remaining skeletal muscle fibers. Any lesions that were suspected of neurogenic atrophy, traumatic muscular degeneration, glycogen storage disease or other porcine muscular disorders were not observed. The immunostaining for dystrophin was conducted and confirmed to be applicable on FFPE porcine muscular tissues and revealed diminished stainability of dystrophin at the sarcolemma in the present case. Based on the histological observations and immunostaining results, the present case was diagnosed with BMD-like myopathy associated with dystrophin abnormality in a pig. Although the genetic properties were not clear, the present BMD-like myopathy implied the occurrence of dystrophinopathy in pigs. To the best of our knowledge, this is the first report of a natural case of myopathy associated with dystrophin abnormalities in a pig.
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Affiliation(s)
- Noriyuki Horiuchi
- Department of Basic Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine, Inada, Obihiro, Hokkaido 080-8555, Japan
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Hannibal L, DiBello PM, Jacobsen DW. Proteomics of vitamin B12 processing. Clin Chem Lab Med 2013; 51:477-88. [PMID: 23241609 DOI: 10.1515/cclm-2012-0568] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2012] [Accepted: 10/23/2012] [Indexed: 12/18/2022]
Abstract
The causes of cobalamin (B12, Cbl) deficiency are multifactorial. Whether nutritional due to poor dietary intake, or functional due to impairments in absorption or intracellular processing and trafficking events, the major symptoms of Cbl deficiency include megaloblastic anemia, neurological deterioration and in extreme cases, failure to thrive and death. The common biomarkers of Cbl deficiency (hyperhomocysteinemia and methylmalonic acidemia) are extremely valuable diagnostic indicators of the condition, but little is known about the changes that occur at the protein level. A mechanistic explanation bridging the physiological changes associated with functional B12 deficiency with its intracellular processers and carriers is lacking. In this article, we will cover the effects of B12 deficiency in a cblC-disrupted background (also referred to as MMACHC) as a model of functional Cbl deficiency. As will be shown, major protein changes involve the cytoskeleton, the neurological system as well as signaling and detoxification pathways. Supplementation of cultured MMACHC-mutant cells with hydroxocobalamin (HOCbl) failed to restore these variants to the normal phenotype, suggesting that a defective Cbl processing pathway produces irreversible changes at the protein level.
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Affiliation(s)
- Luciana Hannibal
- Department of Pathobiology (NC2 – 104), Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA.
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46
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Hauerslev S, Sveen ML, Vissing J, Krag TO. Protein turnover and cellular stress in mildly and severely affected muscles from patients with limb girdle muscular dystrophy type 2I. PLoS One 2013; 8:e66929. [PMID: 23840556 PMCID: PMC3696023 DOI: 10.1371/journal.pone.0066929] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2012] [Accepted: 05/10/2013] [Indexed: 11/19/2022] Open
Abstract
Patients with Limb girdle muscular dystrophy type 2I (LGMD2I) are characterized by progressive muscle weakness and wasting primarily in the proximal muscles, while distal muscles often are spared. Our aim was to investigate if wasting could be caused by impaired regeneration in the proximal compared to distal muscles. Biopsies were simultaneously obtained from proximal and distal muscles of the same patients with LGMD2I (n = 4) and healthy subjects (n = 4). The level of past muscle regeneration was evaluated by counting internally nucleated fibers and determining actively regenerating fibers by using the developmental markers embryonic myosin heavy chain (eMHC) and neural cell adhesion molecule (NCAM) and also assessing satellite cell activation status by myogenin positivity. Severe muscle histopathology was occasionally observed in the proximal muscles of patients with LGMD2I whereas distal muscles were always relatively spared. No difference was found in the regeneration markers internally nucleated fibers, actively regenerating fibers or activation status of satellite cells between proximal and distal muscles. Protein turnover, both synthesis and breakdown, as well as cellular stress were highly increased in severely affected muscles compared to mildly affected muscles. Our results indicate that alterations in the protein turnover and myostatin levels could progressively impair the muscle mass maintenance and/or regeneration resulting in gradual muscular atrophy.
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Affiliation(s)
- Simon Hauerslev
- Neuromuscular Research Unit, Department of Neurology, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | - Marie L. Sveen
- Neuromuscular Research Unit, Department of Neurology, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | - John Vissing
- Neuromuscular Research Unit, Department of Neurology, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | - Thomas O. Krag
- Neuromuscular Research Unit, Department of Neurology, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
- * E-mail:
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47
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Blaeser A, Keramaris E, Chan YM, Sparks S, Cowley D, Xiao X, Lu QL. Mouse models of fukutin-related protein mutations show a wide range of disease phenotypes. Hum Genet 2013; 132:923-34. [PMID: 23591631 DOI: 10.1007/s00439-013-1302-7] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2012] [Accepted: 03/28/2013] [Indexed: 11/26/2022]
Abstract
Dystroglycanopathies are characterized by a reduction in the glycosylation of alpha-dystroglycan (α-DG). A common cause for this subset of muscular dystrophies is mutations in the gene of fukutin-related protein (FKRP). FKRP mutations have been associated with a wide spectrum of clinical severity from severe Walker-Warburg syndrome and muscle-eye-brain disease with brain and eye defects to mild limb-girdle muscular dystrophy 2I with myopathy only. To examine the affects of FKRP mutations on the severity of the disease, we have generated homozygous and compound heterozygous mouse models with human mutations in the murine FKRP gene. P448Lneo+ and E310delneo+ mutations result in severe dystrophic and embryonic lethal phenotypes, respectively. P448Lneo+/E310delneo+ compound heterozygotes exhibit brain defects and severe muscular dystrophies with near absence of α-DG glycosylation. Removal of the Neo(r) cassette from the P448Lneo+ homozygous mice eliminates overt brain and eye defects, and reduces severity of dystrophic phenotypes. Furthermore, introduction of the common L276I mutation to generate transgenic L276Ineo+ homozygous and L276Ineo+/P448Lneo+ and L276Ineo+/E310delneo+ compound heterozygotes results in mice displaying milder dystrophies with reduced α-DG glycosylation and no apparent brain defects. Limited sampling and variation in functionally glycosylated α-DG levels between and within muscles may explain the difficulties in correlating FKRP expression levels with phenotype in clinics. The nature of individual mutations, expression levels and status of muscle differentiation all contribute to the phenotypic manifestation. These mutant FKRP mice are useful models for the study of disease mechanism(s) and experimental therapies.
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Affiliation(s)
- Anthony Blaeser
- McColl-Lockwood Laboratory for Muscular Dystrophy Research, Neuromuscular/ALS Center, Carolinas Medical Center, Charlotte, NC 28231, USA.
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48
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Hukuda ME, Escorcio R, Fernandes LAY, de Carvalho EV, Caromano FA. Evaluation Scale Development, Reliability for Sitting and Standing From the Chair for Duchenne Muscular Dystrophy. J Mot Behav 2013; 45:117-26. [DOI: 10.1080/00222895.2012.760513] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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49
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Na S, Zhang H, Huang F, Wang W, Ding Y, Li D, Jin Y. Regeneration of dental pulp/dentine complex with a three-dimensional and scaffold-free stem-cell sheet-derived pellet. J Tissue Eng Regen Med 2013; 10:261-70. [PMID: 23365018 DOI: 10.1002/term.1686] [Citation(s) in RCA: 90] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2012] [Revised: 10/13/2012] [Accepted: 11/14/2012] [Indexed: 01/09/2023]
Abstract
Dental pulp/dentine complex regeneration is indispensable to the construction of biotissue-engineered tooth roots and represents a promising approach to therapy for irreversible pulpitis. We used a tissue-engineering method based on odontogenic stem cells to design a three-dimensional (3D) and scaffold-free stem-cell sheet-derived pellet (CSDP) with the necessary physical and biological properties. Stem cells were isolated and identified and stem cells from root apical papilla (SCAPs)-based CSDPs were then fabricated and examined. Compact cell aggregates containing a high proportion of extracellular matrix (ECM) components were observed, and the CSDP culture time was prolonged. The expression of alkaline phosphatase (ALP), dentine sialoprotein (DSPP), bone sialoprotein (BSP) and runt-related gene 2 (RUNX2) mRNA was higher in CSDPs than in cell sheets (CSs), indicating that CSDPs have greater odonto/osteogenic potential. To further investigate this hypothesis, CSDPs and CSs were inserted into human treated dentine matrix fragments (hTDMFs) and transplanted into the subcutaneous space in the backs of immunodeficient mice, where they were cultured in vivo for 6 weeks. The root space with CSDPs was filled entirely with a dental pulp-like tissue with well-established vascularity, and a continuous layer of dentine-like tissue was deposited onto the existing dentine. A layer of odontoblast-like cells was found to express DSPP, ALP and BSP, and human mitochondria lined the surface of the newly formed dentine-like tissue. These results clearly indicate that SCAP-CSDPs with a mount of endogenous ECM have a strong capacity to form a heterotopic dental pulp/dentine complex in empty root canals; this method can be used in the fabrication of bioengineered dental roots and also provides an alternative treatment approach for pulp disease.
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Affiliation(s)
- Sijia Na
- Research and Development Centre for Tissue Engineering, Fourth Military Medical University, Xi'an, Shaanxi, People's Republic of China.,Department of Oral and Maxillofacial Surgery, College of Stomatology, Jiamusi University, Jiamusi, Hei Longjiang, People's Republic of China
| | - Hao Zhang
- Research and Development Centre for Tissue Engineering, Fourth Military Medical University, Xi'an, Shaanxi, People's Republic of China.,Department of Orthodontics, School of Stomatology, Fourth Military Medical University, Xi'an, Shaanxi, People's Republic of China
| | - Fang Huang
- Department of Oral and Maxillofacial Surgery, College of Stomatology, Jiamusi University, Jiamusi, Hei Longjiang, People's Republic of China
| | - Weiqi Wang
- Department of Oral and Maxillofacial Surgery, College of Stomatology, Jiamusi University, Jiamusi, Hei Longjiang, People's Republic of China
| | - Yin Ding
- Department of Orthodontics, School of Stomatology, Fourth Military Medical University, Xi'an, Shaanxi, People's Republic of China
| | - Dechao Li
- Department of Oral and Maxillofacial Surgery, College of Stomatology, Jiamusi University, Jiamusi, Hei Longjiang, People's Republic of China
| | - Yan Jin
- Research and Development Centre for Tissue Engineering, Fourth Military Medical University, Xi'an, Shaanxi, People's Republic of China.,Department of Oral Histology and Pathology, School of Stomatology, Fourth Military Medical University, Xi'an, Shaanxi, People's Republic of China
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50
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Cirak S, Foley AR, Herrmann R, Willer T, Yau S, Stevens E, Torelli S, Brodd L, Kamynina A, Vondracek P, Roper H, Longman C, Korinthenberg R, Marrosu G, Nürnberg P, Michele DE, Plagnol V, Hurles M, Moore SA, Sewry CA, Campbell KP, Voit T, Muntoni F. ISPD gene mutations are a common cause of congenital and limb-girdle muscular dystrophies. ACTA ACUST UNITED AC 2013; 136:269-81. [PMID: 23288328 PMCID: PMC3562076 DOI: 10.1093/brain/aws312] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Dystroglycanopathies are a clinically and genetically diverse group of recessively inherited conditions ranging from the most severe of the congenital muscular dystrophies, Walker-Warburg syndrome, to mild forms of adult-onset limb-girdle muscular dystrophy. Their hallmark is a reduction in the functional glycosylation of α-dystroglycan, which can be detected in muscle biopsies. An important part of this glycosylation is a unique O-mannosylation, essential for the interaction of α-dystroglycan with extracellular matrix proteins such as laminin-α2. Mutations in eight genes coding for proteins in the glycosylation pathway are responsible for ∼50% of dystroglycanopathy cases. Despite multiple efforts using traditional positional cloning, the causative genes for unsolved dystroglycanopathy cases have escaped discovery for several years. In a recent collaborative study, we discovered that loss-of-function recessive mutations in a novel gene, called isoprenoid synthase domain containing (ISPD), are a relatively common cause of Walker-Warburg syndrome. In this article, we report the involvement of the ISPD gene in milder dystroglycanopathy phenotypes ranging from congenital muscular dystrophy to limb-girdle muscular dystrophy and identified allelic ISPD variants in nine cases belonging to seven families. In two ambulant cases, there was evidence of structural brain involvement, whereas in seven, the clinical manifestation was restricted to a dystrophic skeletal muscle phenotype. Although the function of ISPD in mammals is not yet known, mutations in this gene clearly lead to a reduction in the functional glycosylation of α-dystroglycan, which not only causes the severe Walker-Warburg syndrome but is also a common cause of the milder forms of dystroglycanopathy.
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Affiliation(s)
- Sebahattin Cirak
- Dubowitz Neuromuscular Centre, UCL Institute of Child Health, University College London, 30 Guilford Street, London WC1N 1EH, UK
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