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Lippi A, Krisko A. Protein aggregation: A detrimental symptom or an adaptation mechanism? J Neurochem 2024; 168:1426-1441. [PMID: 37694504 DOI: 10.1111/jnc.15955] [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: 05/05/2023] [Revised: 08/21/2023] [Accepted: 08/22/2023] [Indexed: 09/12/2023]
Abstract
Protein quality control mechanisms oversee numerous aspects of protein lifetime. From the point of protein synthesis, protein homeostasis machineries take part in folding, solubilization, and/or degradation of impaired proteins. Some proteins follow an alternative path upon loss of their solubility, thus are secluded from the cytosol and form protein aggregates. Protein aggregates differ in their function and composition, rendering protein aggregation a complex phenomenon that continues to receive plenty of attention in the scientific and medical communities. Traditionally, protein aggregates have been associated with aging and a large spectrum of protein folding diseases, such as neurodegenerative diseases, type 2 diabetes, or cataract. However, a body of evidence suggests that they may act as an adaptive mechanism to overcome transient stressful conditions, serving as a sink for the removal of misfolded proteins from the cytosol or storage compartments for machineries required upon stress release. In this review, we present examples and evidence elaborating different possible roles of protein aggregation and discuss their potential roles in stress survival, aging, and disease, as well as possible anti-aggregation interventions.
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Affiliation(s)
- Alice Lippi
- Department of Experimental Neurodegeneration, University Medical Center Göttingen, Göttingen, Germany
| | - Anita Krisko
- Department of Experimental Neurodegeneration, University Medical Center Göttingen, Göttingen, Germany
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2
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Onnée M, Bénézit A, Bastu S, Nadaj-Pakleza A, Lannes B, Ader F, Thèze C, Cintas P, Cances C, Carlier RY, Metay C, Cossée M, Malfatti E. The FLNC Ala1186Val Variant Linked to Cytoplasmic Body Myopathy and Cardiomyopathy Causes Protein Instability. Biomedicines 2024; 12:322. [PMID: 38397924 PMCID: PMC10887408 DOI: 10.3390/biomedicines12020322] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2023] [Revised: 01/18/2024] [Accepted: 01/22/2024] [Indexed: 02/25/2024] Open
Abstract
Filamin C-related disorders include myopathies and cardiomyopathies linked to variants in the FLNC gene. Filamin C belongs to a family of actin-binding proteins involved in sarcomere stability. This study investigates the pathogenic impact of the FLNC c.3557C > T (p.Ala1186Val) pathogenic variant associated with an early-onset cytoplasmic body myopathy and cardiomyopathy in three unrelated patients. We performed clinical imaging and myopathologic and genetic characterization of three patients with an early-onset myopathy and cardiomyopathy. Bioinformatics analysis, variant interpretation, and protein structure analysis were performed to validate and assess the effects of the filamin C variant. All patients presented with a homogeneous clinical phenotype marked by a severe contractural myopathy, leading to loss of gait. There was prominent respiratory involvement and restrictive or hypertrophic cardiomyopathies. The Ala1186Val variant is located in the interstrand loop involved in intradomain stabilization and/or interdomain interactions with neighbor Ig-like domains. 3D modeling highlights local structural changes involving nearby residues and probably impacts the protein stability, causing protein aggregation in the form of cytoplasmic bodies. Myopathologic studies have disclosed the prominent aggregation and upregulation of the aggrephagy-associated proteins LC3B and p62. As a whole, the Ala1186Val variant in the FLNC gene provokes a severe myopathy with contractures, respiratory involvement, and cardiomyopathy due to protein aggregation in patients' muscles.
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Affiliation(s)
- Marion Onnée
- Institut Mondor de Recherche Biomédicale, Université Paris Est Créteil, Institut National de la Santé et de la Recherche Médicale U955, 94010 Créteil, France; (M.O.); (S.B.)
| | - Audrey Bénézit
- Neurologie et Réanimation Pédiatrique, Assistance Publique–Hôpitaux de Paris, Université Paris Saclay, Département Médico-Universitaire Santé de l’Enfant et de l’Adolescent, Hôpital Raymond Poincaré, 92380 Garches, France;
| | - Sultan Bastu
- Institut Mondor de Recherche Biomédicale, Université Paris Est Créteil, Institut National de la Santé et de la Recherche Médicale U955, 94010 Créteil, France; (M.O.); (S.B.)
| | - Aleksandra Nadaj-Pakleza
- Centre de Référence des Maladies Neuromusculaires Nord Est Ile-de-France, Service de Neurologie, Hôpitaux Universitaires de Strasbourg, 67200 Strasbourg, France;
- European Reference Network, EURO-NMD, Neuromuscular Centre at Hautepierre Hospital, Hôpitaux Universitaires de Strasbourg, 67200 Strasbourg, France
| | - Béatrice Lannes
- Département de Pathologie, Hôpitaux Universitaires de Strasbourg, 67091 Strasbourg, France;
| | - Flavie Ader
- Assistance Publique–Hôpitaux de Paris, Sorbonne Université, Département Médico-Universitaire BioGem, Unité Fonctionnelle de Cardiogénétique et Myogénétique Moléculaire et Cellulaire, 75013 Paris, France;
- Institut National de la Santé et de la Recherche Médicale UMRS1166, Université Paris Cité, 75006 Paris, France
| | - Corinne Thèze
- Laboratoire de Génétique Moléculaire, Centre Hospitalier Universitaire de Montpellier, Université de Montpellier, 34095 Montpellier, France;
| | - Pascal Cintas
- Centre de Référence des Maladies Neuromusculaires AOC (Atlantique-Occitanie-Caraïbes), Département de Neurologie, Hôpital Pierre-Paul Riquet, Centre Hospitalier Universitaire de Toulouse, 31059 Toulouse, France; (P.C.); (M.C.)
| | - Claude Cances
- Centre de Référence des Maladies Neuromusculaires AOC (Atlantique-Occitanie-Caraïbes), Unité de Neurologie Pédiatrique, Hôpital des Enfants, Centre Hospitalier Universitaire de Toulouse, 31059 Toulouse, France;
| | - Robert-Yves Carlier
- Assistance Publique–Hôpitaux de Paris, Groupe Hospitalier Universitaire Paris Saclay, Département Médico-Universitaire Smart Imaging, Service d’Imagerie Médicale, Institut National de la Santé et de la Recherche Médicale UMR1179, Hôpital Raymond Poincaré, 92380 Garches, France;
| | - Corinne Metay
- Unité Fonctionnelle de Cardiogénétique et Myogénétique Moléculaire et Cellulaire, Centre de Génétique Moléculaire et Chromosomique, Sorbonne Université, Institut National de la Santé et de la Recherche Médicale, Institut de Myologie, Groupe Hospitalier La Pitié-Salpêtrière, 75013 Paris, France;
| | - Mireille Cossée
- Centre de Référence des Maladies Neuromusculaires AOC (Atlantique-Occitanie-Caraïbes), Département de Neurologie, Hôpital Pierre-Paul Riquet, Centre Hospitalier Universitaire de Toulouse, 31059 Toulouse, France; (P.C.); (M.C.)
- PhyMedExp, Université de Montpellier, Institut National de la Santé et de la Recherche Médicale, Centre National de la Recherche Scientifique, 34295 Montpellier, France
| | - Edoardo Malfatti
- Institut Mondor de Recherche Biomédicale, Université Paris Est Créteil, Institut National de la Santé et de la Recherche Médicale U955, 94010 Créteil, France; (M.O.); (S.B.)
- Assistance Publique–Hôpitaux de Paris, Centre de Référence de Pathologie Neuromusculaire Nord-Est-Ile-de-France, Hôpital Henri Mondor, 94000 Créteil, France
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Takegami N, Mitsutake A, Mano T, Shintani-Domoto Y, Unuma A, Yamaguchi-Takegami N, Ishiura H, Sakuishi K, Ando M, Yamauchi H, Ono M, Morishita S, Mitsui J, Shimizu J, Tsuji S, Toda T. The Myocardial Accumulation of Aggregated Desmin Protein in a Case of Desminopathy with a de novo DES p.R406W Mutation. Intern Med 2023; 62:2883-2887. [PMID: 36792195 PMCID: PMC10602824 DOI: 10.2169/internalmedicine.0992-22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/12/2022] [Accepted: 01/04/2023] [Indexed: 02/16/2023] Open
Abstract
Desminopathy is a cardiac and skeletal myopathy caused by disease-causing variants in the desmin (DES) gene and represents a subgroup of myofibrillar myopathies, where cytoplasmic desmin-postive immunoreactivity is the pathological hallmark. We herein report a 28-year-old Japanese man who was initially diagnosed with sporadic hypertrophic cardiomyopathy with atrioventricular block at 9 years old and developed weakness in the soft palate and extremities. The myocardial tissue dissected during implantation of the ventricular-assisted device showed a dilated phase of hypertrophic cardiomyopathy and intracellular accumulation of proteinase K-resistant desmin aggregates. Genetic testing confirmed a de novo mutation of DES, which has already been linked to desminopathy. As the molecular diagnosis of desminopathy is challenging, particularly if patients show predominantly cardiac signs and a routine skeletal muscle biopsy is unavailable, these characteristic pathological findings of endomyocardial proteinase K-resistant desmin aggregates might aid in clinical practice.
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Affiliation(s)
- Naoki Takegami
- Department of Neurology, Graduate School of Medicine, The University of Tokyo, Japan
| | - Akihiko Mitsutake
- Department of Neurology, Graduate School of Medicine, The University of Tokyo, Japan
| | - Tatsuo Mano
- Department of Neurology, Graduate School of Medicine, The University of Tokyo, Japan
- Department of Degenerative Neurological Diseases, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Japan
| | | | - Atsushi Unuma
- Department of Neurology, Graduate School of Medicine, The University of Tokyo, Japan
| | | | - Hiroyuki Ishiura
- Department of Neurology, Graduate School of Medicine, The University of Tokyo, Japan
| | - Kaori Sakuishi
- Department of Neurology, Graduate School of Medicine, The University of Tokyo, Japan
| | - Masahiko Ando
- Department of Cardiovascular Surgery, Graduate School of Medicine, The University of Tokyo Hospital, Japan
| | - Haruo Yamauchi
- Department of Cardiovascular Surgery, Graduate School of Medicine, The University of Tokyo Hospital, Japan
| | - Minoru Ono
- Department of Cardiovascular Surgery, Graduate School of Medicine, The University of Tokyo Hospital, Japan
| | - Shinichi Morishita
- Department of Computational Biology and Medical Sciences, Graduate School of Frontier Sciences, The University of Tokyo, Japan
| | - Jun Mitsui
- Department of Neurology, Graduate School of Medicine, The University of Tokyo, Japan
- Department of Molecular Neurology, Graduate School of Medicine, The University of Tokyo, Japan
| | - Jun Shimizu
- Department of Neurology, Graduate School of Medicine, The University of Tokyo, Japan
| | - Shoji Tsuji
- Department of Neurology, Graduate School of Medicine, The University of Tokyo, Japan
- Department of Molecular Neurology, Graduate School of Medicine, The University of Tokyo, Japan
- Institute of Medical Genomics, International University of Health and Welfare, Japan
| | - Tatsushi Toda
- Department of Neurology, Graduate School of Medicine, The University of Tokyo, Japan
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Sukhareva KS, Smolina NA, Churkina AI, Kalugina KK, Zhuk SV, Khudiakov AA, Khodot AA, Faggian G, Luciani GB, Sejersen T, Kostareva AA. Desmin mutations impact the autophagy flux in C2C12 cell in mutation-specific manner. Cell Tissue Res 2023; 393:357-375. [PMID: 37277577 PMCID: PMC10406715 DOI: 10.1007/s00441-023-03790-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Accepted: 05/12/2023] [Indexed: 06/07/2023]
Abstract
Desmin is the main intermediate filament of striated and smooth muscle cells and plays a crucial role in maintaining the stability of muscle fiber during contraction and relaxation cycles. Being a component of Z-disk area, desmin integrates autophagic pathways, and the disturbance of Z-disk proteins' structure negatively affects chaperone-assisted selective autophagy (CASA). In the present study, we focused on alteration of autophagy flux in myoblasts expressing various Des mutations. We applied Western blotting, immunocytochemistry, RNA sequencing, and shRNA approach to demonstrate that DesS12F, DesA357P, DesL345P, DesL370P, and DesD399Y mutations. Mutation-specific effect on autophagy flux being most severe in aggregate-prone Des mutations such as DesL345P, DesL370P, and DesD399Y. RNA sequencing data confirmed the most prominent effect of these mutations on expression profile and, in particular, on autophagy-related genes. To verify CASA contribution to desmin aggregate formation, we suppressed CASA by knocking down Bag3 and demonstrated that it promoted aggregate formation and lead to downregulation of Vdac2 and Vps4a and upregulation of Lamp, Pink1, and Prkn. In conclusion, Des mutations showed a mutation-specific effect on autophagy flux in C2C12 cells with either a predominant impact on autophagosome maturation or on degradation and recycling processes. Aggregate-prone desmin mutations lead to the activation of basal autophagy level while suppressing the CASA pathway by knocking down Bag3 can promote desmin aggregate formation.
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Affiliation(s)
- K S Sukhareva
- Institute of Molecular Biology and Genetics, Almazov National Medical Research Centre, Saint-Petersburg, Russia.
- Graduate School of Life and Health Science, University of Verona, Verona, Italy.
| | - N A Smolina
- Institute of Molecular Biology and Genetics, Almazov National Medical Research Centre, Saint-Petersburg, Russia
| | - A I Churkina
- Institute of Molecular Biology and Genetics, Almazov National Medical Research Centre, Saint-Petersburg, Russia
| | - K K Kalugina
- Institute of Molecular Biology and Genetics, Almazov National Medical Research Centre, Saint-Petersburg, Russia
| | - S V Zhuk
- Institute of Molecular Biology and Genetics, Almazov National Medical Research Centre, Saint-Petersburg, Russia
| | - A A Khudiakov
- Institute of Molecular Biology and Genetics, Almazov National Medical Research Centre, Saint-Petersburg, Russia
| | - A A Khodot
- Institute of Molecular Biology and Genetics, Almazov National Medical Research Centre, Saint-Petersburg, Russia
| | - G Faggian
- Graduate School of Life and Health Science, University of Verona, Verona, Italy
| | - G B Luciani
- Graduate School of Life and Health Science, University of Verona, Verona, Italy
| | - T Sejersen
- Department of Women's and Children's Health, Karolinska University Hospital, Karolinska Institutet, Stockholm, Sweden
- Department of Neuropaediatrics, Astrid Lindgren Children's Hospital, Karolinska University Hospital, Stockholm, Sweden
| | - A A Kostareva
- Institute of Molecular Biology and Genetics, Almazov National Medical Research Centre, Saint-Petersburg, Russia
- Department of Women's and Children's Health, Karolinska University Hospital, Karolinska Institutet, Stockholm, Sweden
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5
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Zhang W, Liu Y, Li M, Zhu J, Li X, Luo TR, Liang J. Host Desmin Interacts with RABV Matrix Protein and Facilitates Virus Propagation. Viruses 2023; 15:v15020434. [PMID: 36851648 PMCID: PMC9964581 DOI: 10.3390/v15020434] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2022] [Revised: 01/28/2023] [Accepted: 01/31/2023] [Indexed: 02/09/2023] Open
Abstract
Microfilaments and microtubules, two crucial structures of cytoskeletal networks, are usurped by various viruses for their entry, egress, and/or intracellular trafficking, including the Rabies virus (RABV). Intermediate filaments (IFs) are the third major component of cytoskeletal filaments; however, little is known about the role of IFs during the RABV infection. Here, we identified the IF protein desmin as a novel host interactor with the RABV matrix protein, and we show that this physical interaction has a functional impact on the virus lifecycle. We found that the overexpression of desmin facilitates the RABV infection by increasing the progeny virus yield, and the suppression of endogenous desmin inhibits virus replication. Furthermore, we used confocal microscopy to observe that the RABV-M co-localizes with desmin in IF bundles in the BHK-21 cells. Lastly, we found that mice challenged with RABV displayed an enhanced expression of desmin in the brains of infected animals. These findings reveal a desmin/RABV-M interaction that positively regulates the virus infection and suggests that the RABV may utilize cellular IFs as tracks for the intracellular transport of viral components and efficient budding.
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Affiliation(s)
- Wen Zhang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning 530004, China
- Laboratory of Animal Infectious Diseases, College of Animal Sciences and Veterinary Medicine, Guangxi University, Nanning 530004, China
| | - Yuming Liu
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning 530004, China
- Laboratory of Animal Infectious Diseases, College of Animal Sciences and Veterinary Medicine, Guangxi University, Nanning 530004, China
| | - Mengru Li
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning 530004, China
- Laboratory of Animal Infectious Diseases, College of Animal Sciences and Veterinary Medicine, Guangxi University, Nanning 530004, China
| | - Jian Zhu
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning 530004, China
- Laboratory of Animal Infectious Diseases, College of Animal Sciences and Veterinary Medicine, Guangxi University, Nanning 530004, China
| | - Xiaoning Li
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning 530004, China
- Laboratory of Animal Infectious Diseases, College of Animal Sciences and Veterinary Medicine, Guangxi University, Nanning 530004, China
- Correspondence: (X.L.); (T.R.L.); (J.L.)
| | - Ting Rong Luo
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning 530004, China
- Laboratory of Animal Infectious Diseases, College of Animal Sciences and Veterinary Medicine, Guangxi University, Nanning 530004, China
- Correspondence: (X.L.); (T.R.L.); (J.L.)
| | - Jingjing Liang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning 530004, China
- Laboratory of Animal Infectious Diseases, College of Animal Sciences and Veterinary Medicine, Guangxi University, Nanning 530004, China
- Department of Pathobiology, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
- Correspondence: (X.L.); (T.R.L.); (J.L.)
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Zhang X, To KV, Jarvis TR, Campbell YL, Hendrix JD, Suman SP, Li S, Antonelo DS, Zhai W, Chen J, Zhu H, Schilling MW. Broiler genetics influences proteome profiles of normal and woody breast muscle. Poult Sci 2021; 100:100994. [PMID: 33610896 PMCID: PMC7905473 DOI: 10.1016/j.psj.2021.01.017] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Revised: 12/22/2020] [Accepted: 01/07/2021] [Indexed: 01/28/2023] Open
Abstract
Wooden or woody breast (WB) is a myopathy of the pectoralis major in fast-growing broilers that influences the quality of breast meat and causes an economic loss in the poultry industry. The objective of this study was to evaluate growth and proteome differences between 5 genetic strains of broilers that yield WB and normal breast (NB) meat. Eight-week-old broilers were evaluated for the WB myopathy and divided into NB and WB groups. Differential expression of proteins was analyzed using 2-dimensional gel electrophoresis and LC-MS/MS to elucidate the mechanism behind the breast myopathy because of the genetic backgrounds of the birds. The percentages of birds with WB were 61.3, 68.8, 46.9, 45.2, and 87.5% for strains 1-5, respectively, indicating variability in WB myopathy among broiler strains. Birds from strains 1, 3, and 5 in the WB group were heavier than those in the NB group (P < 0.05). Woody breast meat from all strains were heavier than NB meat (P < 0.05). Within WB, strain 5 had a greater breast yield than strains 1, 3, and 4 (P < 0.0001). Woody breast from strains 2, 3, 4, and 5 had a greater breast yield than NB (P < 0.05). Six proteins were more abundant in NB of strain 5 than those of strains 2, 3, and 4, and these proteins were related to muscle growth, regeneration, contraction, apoptosis, and oxidative stress. Within WB, 14 proteins were differentially expressed between strain 5 and other strains, suggesting high protein synthesis, weak structural integrity, intense contraction, and oxidative stress in strain 5 birds. The differences between WB from strain 3 and strains 1, 2, and 4 were mainly glycolytic. In conclusion, protein profiles of broiler breast differed because of both broiler genetics and the presence of WB myopathy.
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Affiliation(s)
- Xue Zhang
- Department of Food Science, Nutrition, and Health Promotion, Mississippi State University, Mississippi State 39762, USA
| | - K Virellia To
- Department of Food Science, Nutrition, and Health Promotion, Mississippi State University, Mississippi State 39762, USA
| | - Tessa R Jarvis
- Department of Animal Science, Iowa State University, Ames 50011, USA
| | - Yan L Campbell
- Department of Food Science, Nutrition, and Health Promotion, Mississippi State University, Mississippi State 39762, USA
| | - Jasmine D Hendrix
- Department of Food Science, Nutrition, and Health Promotion, Mississippi State University, Mississippi State 39762, USA
| | - Surendranath P Suman
- Department of Animal and Food Sciences, University of Kentucky, Lexington 40546, USA
| | - Shuting Li
- Department of Animal and Food Sciences, University of Kentucky, Lexington 40546, USA
| | - Daniel S Antonelo
- Department of Animal Nutrition and Production, College of Veterinary Medicine and Animal Science, University of Sao Paulo, Pirassununga/SP 13635-900, Brazil
| | - Wei Zhai
- Department of Poultry Science, Mississippi State University, Mississippi State 39762, USA
| | - Jing Chen
- Proteomics Core Facility, University of Kentucky, Lexington 40506, USA
| | - Haining Zhu
- Proteomics Core Facility, University of Kentucky, Lexington 40506, USA
| | - M Wes Schilling
- Department of Food Science, Nutrition, and Health Promotion, Mississippi State University, Mississippi State 39762, USA.
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A Twist2-dependent progenitor cell contributes to adult skeletal muscle. Nat Cell Biol 2017; 19:202-213. [PMID: 28218909 PMCID: PMC5332283 DOI: 10.1038/ncb3477] [Citation(s) in RCA: 101] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2016] [Accepted: 01/18/2017] [Indexed: 02/06/2023]
Abstract
Skeletal muscle possesses remarkable regenerative potential due to satellite cells, an injury-responsive stem cell population located beneath the muscle basal lamina that expresses Pax7. By lineage tracing of progenitor cells expressing the Twist2 (Tw2) transcription factor in mice, we discovered a myogenic lineage that resides outside the basal lamina of adult skeletal muscle. Tw2+ progenitors are molecularly and anatomically distinct from satellite cells, are highly myogenic in vitro, and can fuse with themselves and with satellite cells. Tw2+ progenitors contribute specifically to type IIb/x myofibers during adulthood and muscle regeneration, and their genetic ablation causes wasting of type IIb myofibers. We show that Tw2 expression maintains progenitor cells in an undifferentiated state that is poised to initiate myogenesis in response to appropriate cues that extinguish Tw2 expression. Tw2-expressing myogenic progenitors represent a previously unrecognized, fiber-type specific stem cell involved in post-natal muscle growth and regeneration.
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8
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Myofibril breakdown during atrophy is a delayed response requiring the transcription factor PAX4 and desmin depolymerization. Proc Natl Acad Sci U S A 2017; 114:E1375-E1384. [PMID: 28096335 DOI: 10.1073/pnas.1612988114] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
A hallmark of muscle atrophy is the excessive degradation of myofibrillar proteins primarily by the ubiquitin proteasome system. In mice, during the rapid muscle atrophy induced by fasting, the desmin cytoskeleton and the attached Z-band-bound thin filaments are degraded after ubiquitination by the ubiquitin ligase tripartite motif-containing protein 32 (Trim32). To study the order of events leading to myofibril destruction, we investigated the slower atrophy induced by denervation (disuse). We show that myofibril breakdown is a two-phase process involving the initial disassembly of desmin filaments by Trim32, which leads to the later myofibril breakdown by enzymes, whose expression is increased by the paired box 4 (PAX4) transcription factor. After denervation of mouse tibialis anterior muscles, phosphorylation and Trim32-dependent ubiquitination of desmin filaments increased rapidly and stimulated their gradual depolymerization (unlike their rapid degradation during fasting). Trim32 down-regulation attenuated the loss of desmin and myofibrillar proteins and reduced atrophy. Although myofibrils and desmin filaments were intact at 7 d after denervation, inducing the dissociation of desmin filaments caused an accumulation of ubiquitinated proteins and rapid destruction of myofibrils. The myofibril breakdown normally observed at 14 d after denervation required not only dissociation of desmin filaments, but also gene induction by PAX4. Down-regulation of PAX4 or its target gene encoding the p97/VCP ATPase reduced myofibril disassembly and degradation on denervation or fasting. Thus, during atrophy, the initial loss of desmin is critical for the subsequent myofibril destruction, and over time, myofibrillar proteins become more susceptible to PAX4-induced enzymes that promote proteolysis.
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9
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Pedrotti S, Giudice J, Dagnino-Acosta A, Knoblauch M, Singh RK, Hanna A, Mo Q, Hicks J, Hamilton S, Cooper TA. The RNA-binding protein Rbfox1 regulates splicing required for skeletal muscle structure and function. Hum Mol Genet 2015; 24:2360-74. [PMID: 25575511 DOI: 10.1093/hmg/ddv003] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
The Rbfox family of RNA-binding proteins is highly conserved with established roles in alternative splicing (AS) regulation. High-throughput studies aimed at understanding transcriptome remodeling have revealed skeletal muscle as displaying one of the largest number of AS events. This finding is consistent with requirements for tissue-specific protein isoforms needed to sustain muscle-specific functions. Rbfox1 is abundant in vertebrate brain, heart and skeletal muscle. Genome-wide genetic approaches have linked the Rbfox1 gene to autism, and a brain-specific knockout mouse revealed a critical role for this splicing regulator in neuronal function. Moreover, a Caenorhabditis elegans Rbfox1 homolog regulates muscle-specific splicing. To determine the role of Rbfox1 in muscle function, we developed a conditional knockout mouse model to specifically delete Rbfox1 in adult tissue. We show that Rbfox1 is required for muscle function but a >70% loss of Rbfox1 in satellite cells does not disrupt muscle regeneration. Deep sequencing identified aberrant splicing of multiple genes including those encoding myofibrillar and cytoskeletal proteins, and proteins that regulate calcium handling. Ultrastructure analysis of Rbfox1(-/-) muscle by electron microscopy revealed abundant tubular aggregates. Immunostaining showed mislocalization of the sarcoplasmic reticulum proteins Serca1 and Ryr1 in a pattern indicative of colocalization with the tubular aggregates. Consistent with mislocalization of Serca1 and Ryr1, calcium handling was drastically altered in Rbfox1(-/-) muscle. Moreover, muscle function was significantly impaired in Rbfox1(-/-) muscle as indicated by decreased force generation. These results demonstrate that Rbfox1 regulates a network of AS events required to maintain multiple aspects of muscle physiology.
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Affiliation(s)
| | | | | | | | | | - Amy Hanna
- Department of Molecular Physiology and Biophysics
| | - Qianxing Mo
- Dan L. Duncan Cancer Center, Department of Medicine
| | - John Hicks
- Department of Pathology and Immunology, Department of Pediatrics, Baylor College of Medicine, Houston, TX 77030, USA and Texas Children's Hospital, Houston, TX 77030, USA
| | | | - Thomas A Cooper
- Department of Pathology and Immunology, Department of Molecular and Cellular Biology, Department of Molecular Physiology and Biophysics,
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10
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Koutakis P, Miserlis D, Myers SA, Kim JKS, Zhu Z, Papoutsi E, Swanson SA, Haynatzki G, Ha DM, Carpenter LA, McComb RD, Johanning JM, Casale GP, Pipinos II. Abnormal accumulation of desmin in gastrocnemius myofibers of patients with peripheral artery disease: associations with altered myofiber morphology and density, mitochondrial dysfunction and impaired limb function. J Histochem Cytochem 2015; 63:256-69. [PMID: 25575565 DOI: 10.1369/0022155415569348] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
Patients with peripheral artery disease (PAD) develop a myopathy in their ischemic lower extremities, which is characterized by myofiber degeneration, mitochondrial dysfunction and impaired limb function. Desmin, a protein of the cytoskeleton, is central to maintenance of the structure, shape and function of the myofiber and its organelles, especially the mitochondria, and to translation of sarcomere contraction into muscle contraction. In this study, we investigated the hypothesis that disruption of the desmin network occurs in gastrocnemius myofibers of PAD patients and correlates with altered myofiber morphology, mitochondrial dysfunction, and impaired limb function. Using fluorescence microscopy, we evaluated desmin organization and quantified myofiber content in the gastrocnemius of PAD and control patients. Desmin was highly disorganized in PAD but not control muscles and myofiber content was increased significantly in PAD compared to control muscles. By qPCR, we found that desmin gene transcripts were increased in the gastrocnemius of PAD patients as compared with control patients. Increased desmin and desmin gene transcripts in PAD muscles correlated with altered myofiber morphology, decreased mitochondrial respiration, reduced calf muscle strength and decreased walking performance. In conclusion, our studies identified disruption of the desmin system in gastrocnemius myofibers as an index of the myopathy and limitation of muscle function in patients with PAD.
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Affiliation(s)
- Panagiotis Koutakis
- Department of Surgery (PK, DM, JKK, ZZ, EP, SAS, DMH, LAC, JMJ, GPC, IIP)
| | - Dimitrios Miserlis
- Department of Surgery (PK, DM, JKK, ZZ, EP, SAS, DMH, LAC, JMJ, GPC, IIP)
| | - Sara A Myers
- Nebraska Biomechanics Core Facility, University of Nebraska at Omaha, Nebraska (SAM)
| | - Julian Kyung-Soo Kim
- Department of Surgery (PK, DM, JKK, ZZ, EP, SAS, DMH, LAC, JMJ, GPC, IIP)
| | - Zhen Zhu
- Department of Surgery (PK, DM, JKK, ZZ, EP, SAS, DMH, LAC, JMJ, GPC, IIP)
| | - Evlampia Papoutsi
- Department of Surgery (PK, DM, JKK, ZZ, EP, SAS, DMH, LAC, JMJ, GPC, IIP)
| | - Stanley A Swanson
- Department of Surgery (PK, DM, JKK, ZZ, EP, SAS, DMH, LAC, JMJ, GPC, IIP)
| | - Gleb Haynatzki
- Department of Biostatistics, College of Public Health (GH)
| | - Duy M Ha
- Department of Surgery (PK, DM, JKK, ZZ, EP, SAS, DMH, LAC, JMJ, GPC, IIP)
| | - Lauren A Carpenter
- Department of Surgery (PK, DM, JKK, ZZ, EP, SAS, DMH, LAC, JMJ, GPC, IIP)
| | | | - Jason M Johanning
- Department of Surgery (PK, DM, JKK, ZZ, EP, SAS, DMH, LAC, JMJ, GPC, IIP),Department of Surgery and VA Research Service, VA Nebraska-Western Iowa Health Care System, Omaha, Nebraska (JMJ, IIP)
| | - George P Casale
- Department of Surgery (PK, DM, JKK, ZZ, EP, SAS, DMH, LAC, JMJ, GPC, IIP)
| | - Iraklis I Pipinos
- Department of Surgery (PK, DM, JKK, ZZ, EP, SAS, DMH, LAC, JMJ, GPC, IIP),Department of Surgery and VA Research Service, VA Nebraska-Western Iowa Health Care System, Omaha, Nebraska (JMJ, IIP)
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11
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Abstract
In this article, distal myopathy syndromes are discussed. A discussion of the more traditional distal myopathies is followed by discussion of the myofibrillar myopathies. Other clinically and genetically distinctive distal myopathy syndromes usually based on single or smaller family cohorts are reviewed. Other neuromuscular disorders that are important to recognize are also considered, because they show prominent distal limb weakness.
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Affiliation(s)
- Mazen M Dimachkie
- Neuromuscular Section, Neurophysiology Division, Department of Neurology, University of Kansas Medical Center, 3901 Rainbow Boulevard, Mail Stop 2012, Kansas City, KS 66160, USA.
| | - Richard J Barohn
- Department of Neurology, University of Kansas Medical Center, 3901 Rainbow Boulevard, Mail Stop 2012, Kansas City, KS 66160, USA
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12
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Cetin N, Balci-Hayta B, Gundesli H, Korkusuz P, Purali N, Talim B, Tan E, Selcen D, Erdem-Ozdamar S, Dincer P. A novel desmin mutation leading to autosomal recessive limb-girdle muscular dystrophy: distinct histopathological outcomes compared with desminopathies. J Med Genet 2013; 50:437-43. [DOI: 10.1136/jmedgenet-2012-101487] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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13
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Maddison P, Damian MS, Sewry C, McGorrian C, Winer JB, Odgerel Z, Shatunov A, Lee HS, Goldfarb LG. Clinical and myopathological characteristics of desminopathy caused by a mutation in desmin tail domain. Eur Neurol 2012; 68:279-86. [PMID: 23051780 DOI: 10.1159/000341617] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2012] [Accepted: 07/01/2012] [Indexed: 01/04/2023]
Abstract
BACKGROUND Most of the previously described pathogenic mutations in desmin are located in highly conserved α-helical domains that play an important role in intermediate filament assembly. The role of the C-terminus non-α-helical 'tail' domain is much less investigated and until recently mutations in this domain have been implicated in only a few patients. The majority of reported desminopathy cases caused by the tail mutations were sporadic, creating a representation bias regarding the disease frequency and phenotypic characteristics. METHODS We performed detailed genotype-phenotype analysis of autosomal dominant desminopathy associated with tail domain mutations in a four-generation autosomal dominant family with 16 members affected by a progressive cardiac and/or skeletal myopathy caused by a c.1346A>C (p.Lys449Thr) mutation located in the tail domain of desmin. RESULTS Phenotypic features in patients with tail domain mutations are similar to those in patients with mutations localized in the 1B and 2B α-helical domains. CONCLUSION We recommend that the tail domain is searched for mutations as intensely as desmin coil domains which until recently were considered to be more 'functional'.
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Affiliation(s)
- Paul Maddison
- Department of Neurology, Nottingham University Hospitals, Queens Medical Centre, Nottingham, UK.
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14
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van Spaendonck-Zwarts KY, van der Kooi AJ, van den Berg MP, Ippel EF, Boven LG, Yee WC, van den Wijngaard A, Brusse E, Hoogendijk JE, Doevendans PA, de Visser M, Jongbloed JDH, van Tintelen JP. Recurrent and founder mutations in the Netherlands: the cardiac phenotype of DES founder mutations p.S13F and p.N342D. Neth Heart J 2012; 20:219-28. [PMID: 22215463 PMCID: PMC3346870 DOI: 10.1007/s12471-011-0233-y] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Background Desmin-related myopathy (DRM) is an autosomally inherited skeletal and cardiac myopathy, mainly caused by dominant mutations in the desmin gene (DES). We describe new families carrying the p.S13F or p.N342D DES mutations, the cardiac phenotype of all carriers, and the founder effects. Methods We collected the clinical details of all carriers of p.S13F or p.N342D. The founder effects were studied using genealogy and haplotype analysis. Results We identified three new index patients carrying the p.S13F mutation and two new families carrying the p.N342D mutation. In total, we summarised the clinical details of 39 p.S13F carriers (eight index patients) and of 21 p.N342D carriers (three index patients). The cardiac phenotype of p.S13F carriers is fully penetrant and severe, characterised by cardiac conduction disease and cardiomyopathy, often with right ventricular involvement. Although muscle weakness is a prominent and presenting symptom in p.N342D carriers, their cardiac phenotype is similar to that of p.S13F carriers. The founder effects of p.S13F and p.N342D were demonstrated by genealogy and haplotype analysis. Conclusion DRM may occur as an apparently isolated cardiological disorder. The cardiac phenotypes of the DES founder mutations p.S13F and p.N342D are characterised by cardiac conduction disease and cardiomyopathy, often with right ventricular involvement. Electronic supplementary material The online version of this article (doi:10.1007/s12471-011-0233-y) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- K Y van Spaendonck-Zwarts
- Department of Genetics, University of Groningen, University Medical Center Groningen, PO Box 30001, 9700 RB, Groningen, the Netherlands,
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15
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Liu N, Williams AH, Maxeiner JM, Bezprozvannaya S, Shelton JM, Richardson JA, Bassel-Duby R, Olson EN. microRNA-206 promotes skeletal muscle regeneration and delays progression of Duchenne muscular dystrophy in mice. J Clin Invest 2012; 122:2054-65. [PMID: 22546853 DOI: 10.1172/jci62656] [Citation(s) in RCA: 246] [Impact Index Per Article: 20.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2011] [Accepted: 03/14/2012] [Indexed: 12/12/2022] Open
Abstract
Skeletal muscle injury activates adult myogenic stem cells, known as satellite cells, to initiate proliferation and differentiation to regenerate new muscle fibers. The skeletal muscle-specific microRNA miR-206 is upregulated in satellite cells following muscle injury, but its role in muscle regeneration has not been defined. Here, we show that miR-206 promotes skeletal muscle regeneration in response to injury. Genetic deletion of miR-206 in mice substantially delayed regeneration induced by cardiotoxin injury. Furthermore, loss of miR-206 accelerated and exacerbated the dystrophic phenotype in a mouse model of Duchenne muscular dystrophy. We found that miR-206 acts to promote satellite cell differentiation and fusion into muscle fibers through suppressing a collection of negative regulators of myogenesis. Our findings reveal an essential role for miR-206 in satellite cell differentiation during skeletal muscle regeneration and indicate that miR-206 slows progression of Duchenne muscular dystrophy.
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Affiliation(s)
- Ning Liu
- Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, Texas 75390-9148, USA.
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16
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Russ DW, Grandy JS. Increased desmin expression in hindlimb muscles of aging rats. J Cachexia Sarcopenia Muscle 2011; 2:175-180. [PMID: 21966643 PMCID: PMC3177037 DOI: 10.1007/s13539-011-0033-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/07/2011] [Accepted: 06/27/2011] [Indexed: 01/23/2023] Open
Abstract
BACKGROUND: Aging skeletal muscle frequently exhibits a reduction in force produced per unit muscle tissue, variously termed muscle quality, specific tension or dynapenia. Muscles from animals in which desmin expression is reduced exhibit similar properties, raising the possibility that reduced desmin expression contributes to impaired force production in aging muscles. METHODS: We examined expression of desmin and synemin, both intermediate filament proteins, in the plantarflexor muscles of adult (6-8 months) and older (24 months) rats. We have previously reported age-related reductions in muscle quality and sarcoplasmic reticulum function in these animals. RESULTS: Significant effects of age and muscle were found for the expression of desmin (P = 0.040 and <0.001 respectively), but not synemin. Desmin expression was increased in the aging muscles, with the greatest changes observed in the gastrocnemius muscles. Muscle quality, but not muscle mass, was reduced in the aging plantarflexor muscles. CONCLUSIONS: Loss of desmin does not account for reduced force production in aging muscles. The potential effects of the age-related increase in desmin on muscle function remain unclear, but may include dissipation of contractile force.
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Affiliation(s)
- David W. Russ
- Laboratory for Integrative Muscle Biology, Division of Physical Therapy, School of Rehabilitation and Communication Sciences, Ohio University, W279 Grover Center, Athens, OH 45701 USA
- Ohio Musculoskeletal and Neurological Institute, Ohio University College of Osteopathic Medicine, Athens, OH USA
| | - Jessica S. Grandy
- Laboratory for Integrative Muscle Biology, Division of Physical Therapy, School of Rehabilitation and Communication Sciences, Ohio University, W279 Grover Center, Athens, OH 45701 USA
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17
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Analysis of differentially expressed proteins in colorectal cancer using hydroxyapatite column and SDS-PAGE. Appl Biochem Biotechnol 2011; 165:1211-24. [PMID: 21863284 DOI: 10.1007/s12010-011-9339-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2011] [Accepted: 08/10/2011] [Indexed: 12/18/2022]
Abstract
Limitation on two dimensional (2D) gel electrophoresis technique causes some proteins to be under presented, especially the extreme acidic, basic, or membrane proteins. To overcome the limitation of 2D electrophoresis, an analysis method was developed for identification of differentially expressed proteins in normal and cancerous colonic tissues using self-pack hydroxyapatite (HA) column. Normal and cancerous colon tissues were homogenized and proteins were extracted using sodium phosphate buffer at pH 6.8. Protein concentration was determined and the proteins were loaded unto the HA column. HA column reduced the complexity of proteins mixture by fractionating the proteins according to their ionic strength. Further protein separation was accomplished by a simple and cost effective sodium dodecyl sulfate-polyacrylamide gel electrophoresis method. The protein bands were subjected to in-gel digestion and protein analysis was performed using electrospray ionization (ESI) ion trap mass spectrometer. There were 17 upregulated proteins and seven downregulated proteins detected with significant differential expression. Some of these proteins were low abundant proteins or proteins with extreme pH that were usually under presented in 2D gel analysis. We have identified brain mitochondrial carrier protein 1, T-cell surface glycoprotein CD1a, SOSS complex subunit B2, and Protein Jade 1 which were previously not detected in 2D gel analysis method.
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18
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Abstract
The intermediate filament protein desmin is an integral component of the cardiomyocyte and serves to maintain the overall structure and cytoskeletal organization within striated muscle cells. Desmin-related myopathy can be caused by mutations in desmin or associated proteins, which leads to intracellular accumulation of misfolded protein and production of soluble pre-amyloid oligomers, which leads to weakened skeletal and cardiac muscle. In this review, we examine the cellular phenotypes in relevant animal models of desmin-related cardiomyopathy. These models display characteristic sarcoplasmic protein aggregates. Aberrant protein aggregation leads to mitochondrial dysfunction, abnormal metabolism, and altered cardiomyocyte structure. These deficits to cardiomyocyte function may stem from impaired cellular proteolytic mechanisms. The data obtained from these models allow a more complete picture of the pathology in desmin-related cardiomyopathy to be described. Moreover, these studies highlight the importance of desmin in maintaining cardiomyocyte structure and illustrate how disrupting this network can be deleterious to the heart. We emphasize the similarities observed between desmin-related cardiomyopathy and other protein conformational disorders and speculate that therapies to treat this disease may be broadly applicable to diverse protein aggregation-based disorders.
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Affiliation(s)
- Patrick M McLendon
- Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio 45229-3039, USA
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19
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Lee DH, Ro H. Effect of Exercise on Intermediate Filament Expression in the Skeletal Muscles of Rats with Sciatic Nerve Injury. J Phys Ther Sci 2011. [DOI: 10.1589/jpts.23.213] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Affiliation(s)
- Dae-Hee Lee
- Department of Physical Therapy, Youngdong University
| | - Hyolyun Ro
- Department of Occupational Therapy, Kangwon National University
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20
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Chien YY, Nonaka I, Wang D. Autosomal dominant late-onset quadriceps myopathy: three patients of a Taiwanese kindred. Intern Med 2011; 50:1175-81. [PMID: 21628932 DOI: 10.2169/internalmedicine.50.5070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
OBJECTIVE Primary quadriceps weakness/atrophy is a rare disorder with variable etiologies; therefore, this disorder has been regarded as a clinical syndrome rather than a distinct entity. However, three affected patients of a Taiwanese family demonstrate a uniform pattern of quadriceps weakness and atrophy, their clinical manifestations and pattern of inheritance may suggest a new disease entity. PATIENTS AND METHODS Three patients in a Taiwanese kindred with selective quadriceps weakness and atrophy, which began after age 40 years, were examined. To disclose the confines of this disorder, muscle CT scans, electromyography, nerve conduction studies and muscle biopsies were performed; and to unravel and better understand the nature of this disorder, histopathological, ultrastructural, immunocytochemical and genetic studies were carried out. RESULTS In two patients with long-standing disease, muscle imaging showed marked atrophy and fat replacement of the anterior thigh muscles and electromyography showed a mixture of myopathic and neuropathic changes. Muscle histopathology on the mildly affected tibialis anterior showed myopathic changes with myofibrillar degeneration and secondary neurogenic alterations. Immunocytochemical staining was not diagnostic but excluded the dystrophinopathies and other well-known muscular dystrophies. CONCLUSION All previously identified diseases resulting in quadriceps weakness and atrophy have been ruled out and the present disorder appears to be a new disease entity of autosomal dominant late onset quadriceps myopathy.
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Affiliation(s)
- Yu-Yi Chien
- Department of Neurology, Keelung Chang Gung Memorial Hospital, Taiwan.
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21
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van Spaendonck-Zwarts KY, van Hessem L, Jongbloed JDH, de Walle HEK, Capetanaki Y, van der Kooi AJ, van Langen IM, van den Berg MP, van Tintelen JP. Desmin-related myopathy. Clin Genet 2010; 80:354-66. [PMID: 20718792 DOI: 10.1111/j.1399-0004.2010.01512.x] [Citation(s) in RCA: 145] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Desmin-related myopathy (DRM) is an autosomally inherited skeletal and cardiac myopathy, mainly caused by dominant mutations in the desmin gene (DES). We provide (i) a literature review on DRM, including clinical manifestations, inheritance, molecular genetics, myopathology and management and (ii) a meta-analysis of reported DES mutation carriers, focusing on their clinical characteristics and potential genotype-phenotype correlations. Meta-analysis: DES mutation carriers (n = 159) with 40 different mutations were included. Neurological signs were present in 74% and cardiological signs in 74% of carriers (both neurological and cardiological signs in 49%, isolated neurological signs in 22%, and isolated cardiological signs in 22%). More than 70% of carriers exhibited myopathy or muscular weakness, with normal creatine kinase levels present in one third of them. Up to 50% of carriers had cardiomyopathy and around 60% had cardiac conduction disease or arrhythmias, with atrioventricular block as an important hallmark. Symptoms generally started during the 30s; a quarter of carriers died at a mean age of 49 years. Sudden cardiac death occurred in two patients with a pacemaker, suggesting a ventricular tachyarrhythmia as cause of death. The majority of DES mutations were missense mutations, mostly located in the 2B domain. Mutations in the 2B domain were predominant in patients with an isolated neurological phenotype, whereas head and tail domain mutations were predominant in patients with an isolated cardiological phenotype.
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Affiliation(s)
- K Y van Spaendonck-Zwarts
- Department of Genetics, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands.
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22
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Divergent Molecular Effects of Desmin Mutations on Protein Assembly in Myofibrillar Myopathy. J Neuropathol Exp Neurol 2010; 69:415-24. [DOI: 10.1097/nen.0b013e3181d71305] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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23
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Abstract
Myofibrillar myopathies (MFMs) are clinically and genetically heterogeneous muscle disorders that are defined morphologically by the presence of foci of myofibril dissolution, accumulation of myofibrillar degradation products, and ectopic expression of multiple proteins. MFMs are the paradigm of conformational protein diseases of the skeletal (and cardiac) muscles characterised by intracellular protein accumulation in muscle cells. Understanding of this group of disorders has advanced in recent years through the identification of causative mutations in various genes, most of which encode proteins of the sarcomeric Z-disc, including desmin, alphaB-crystallin, myotilin, ZASP and filamin C. This review focuses on the MFMs arising from defects in these proteins, summarising genetic and clinical features of the disorders and then discussing emerging understanding of the molecular pathogenic mechanisms leading to muscle fibre degeneration. Defective extralysosomal degradation of proteins is now recognised as an important element in this process. Several factors--including mutant proteins, a defective ubiquitin-proteasome system, aggresome formation, mutant ubiquitin, p62, oxidative stress and abnormal regulation of some transcription factors--are thought to participate in the cascade of events occurring in muscle fibres in MFMs.
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24
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Goldfarb LG, Olivé M, Vicart P, Goebel HH. Intermediate filament diseases: desminopathy. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2008; 642:131-64. [PMID: 19181099 PMCID: PMC2776705 DOI: 10.1007/978-0-387-84847-1_11] [Citation(s) in RCA: 81] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Desminopathy is one of the most common intermediate filament human disorders associated with mutations in closely interacting proteins, desmin and alphaB-crystallin. The inheritance pattern in familial desminopathy is characterized as autosomal dominant or autosomal recessive, but many cases have no family history. At least some and likely most sporadic desminopathy cases are associated with de novo DES mutations. The age of disease onset and rate of progression may vary depending on the type of inheritance and location of the causative mutation. Typically, the illness presents with lower and later upper limb muscle weakness slowly spreading to involve truncal, neck-flexor, facial and bulbar muscles. Skeletal myopathy is often combined with cardiomyopathy manifested by conduction blocks, arrhythmias and chronic heart failure resulting in premature sudden death. Respiratory muscle weakness is a major complication in some patients. Sections of the affected skeletal and cardiac muscles show abnormal fibre areas containing chimeric aggregates consisting of desmin and other cytoskeletal proteins. Various DES gene mutations: point mutations, an insertion, small in-frame deletions and a larger exon-skipping deletion, have been identified in desminopathy patients. The majority of these mutations are located in conserved alpha-helical segments, but additional mutations have recently been identified in the tail domain. Filament and network assembly studies indicate that most but not all disease-causing mutations make desmin assembly-incompetent and able to disrupt a pre-existing filamentous network in dominant-negative fashion. AlphaB-crystallin serves as a chaperone for desmin preventing its aggregation under various forms of stress; mutant CRYAB causes cardiac and skeletal myopathies identical to those resulting from DES mutations.
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Affiliation(s)
- Lev G Goldfarb
- National Institutes of Health, Bethesda, MD 20892-9404, USA.
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25
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Capetanaki Y, Bloch RJ, Kouloumenta A, Mavroidis M, Psarras S. Muscle intermediate filaments and their links to membranes and membranous organelles. Exp Cell Res 2007; 313:2063-76. [PMID: 17509566 DOI: 10.1016/j.yexcr.2007.03.033] [Citation(s) in RCA: 203] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2007] [Revised: 03/20/2007] [Accepted: 03/29/2007] [Indexed: 12/17/2022]
Abstract
Intermediate filaments (IFs) play a key role in the integration of structure and function of striated muscle, primarily by mediating mechanochemical links between the contractile apparatus and mitochondria, myonuclei, the sarcolemma and potentially the vesicle trafficking apparatus. Linkage of all these membranous structures to the contractile apparatus, mainly through the Z-disks, supports the integration and coordination of growth and energy demands of the working myocyte, not only with force transmission, but also with de novo gene expression, energy production and efficient protein and lipid trafficking and targeting. Desmin, the most abundant and intensively studied muscle intermediate filament protein, is linked to proper costamere organization, myoblast and stem cell fusion and differentiation, nuclear shape and positioning, as well as mitochondrial shape, structure, positioning and function. Similar links have been established for lysosomes and lysosome-related organelles, consistent with the presence of widespread links between IFs and membranous structures and the regulation of their fusion, morphology and stabilization necessary for cell survival.
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Affiliation(s)
- Yassemi Capetanaki
- Cell Biology Division, Center of Basic Research, Biomedical Research Foundation Academy of Athens, Soranou Efessiou 4, 12965 Athens, Greece.
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26
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McMillan JR, Akiyama M, Rouan F, Mellerio JE, Lane EB, Leigh IM, Owaribe K, Wiche G, Fujii N, Uitto J, Eady RAJ, Shimizu H. Plectin defects in epidermolysis bullosa simplex with muscular dystrophy. Muscle Nerve 2007; 35:24-35. [PMID: 16967486 DOI: 10.1002/mus.20655] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Epidermolysis bullosa simplex with muscular dystrophy (EBS-MD, MIM 226670) is caused by plectin defects. We performed mutational analysis and immunohistochemistry using EBS-MD (n = 3 cases) and control skeletal muscle to determine pathogenesis. Mutational analysis revealed a novel homozygous plectin-exon32 rod domain mutation (R2465X). All plectin/HD1-121 antibodies stained the control skeletal muscle membrane. However, plectin antibodies stained the cytoplasm of type II control muscle fibers (as confirmed by ATPase staining), whereas HD1-121 stained the cytoplasm of type I fibers. EBS-MD samples lacked membrane (n = 3) but retained cytoplasmic HD1-121 (n = 1) and plectin staining in type II fibers (n = 3). Ultrastructurally, EBS-MD demonstrated widening and vacuolization adjacent to the membrane and disorganization of Z-lines (n = 2 of 3) compared to controls (n = 5). Control muscle immunogold labeling colocalized plectin and desmin to filamentous bridges between Z-lines and the membrane that were disrupted in EBS-MD muscle. We conclude that fiber-specific plectin expression is associated with the desmin-cytoskeleton, Z-lines, and crucially myocyte membrane linkage, analogous to hemidesmosomes in skin.
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MESH Headings
- Adult
- Cell Membrane/metabolism
- Cell Membrane/pathology
- Cell Membrane/ultrastructure
- Child
- Cytoplasm/metabolism
- Cytoplasm/pathology
- Cytoplasm/ultrastructure
- Cytoskeleton/metabolism
- Cytoskeleton/pathology
- Cytoskeleton/ultrastructure
- DNA Mutational Analysis
- Desmosomes/metabolism
- Desmosomes/pathology
- Desmosomes/ultrastructure
- Epidermolysis Bullosa Simplex/complications
- Epidermolysis Bullosa Simplex/metabolism
- Epidermolysis Bullosa Simplex/pathology
- Female
- Genetic Predisposition to Disease/genetics
- Humans
- Immunohistochemistry
- Male
- Microscopy, Immunoelectron
- Middle Aged
- Muscle Fibers, Fast-Twitch/metabolism
- Muscle Fibers, Fast-Twitch/pathology
- Muscle Fibers, Fast-Twitch/ultrastructure
- Muscle Fibers, Slow-Twitch/metabolism
- Muscle Fibers, Slow-Twitch/pathology
- Muscle Fibers, Slow-Twitch/ultrastructure
- Muscle, Skeletal/metabolism
- Muscle, Skeletal/pathology
- Muscle, Skeletal/ultrastructure
- Muscular Dystrophies/complications
- Muscular Dystrophies/metabolism
- Muscular Dystrophies/pathology
- Mutation/genetics
- Plectin/analysis
- Plectin/genetics
- Plectin/metabolism
- Protein Structure, Tertiary/genetics
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Affiliation(s)
- J R McMillan
- Department of Dermatology, Hokkaido University Graduate School of Medicine, Kita-ku, Sapporo 060-8638, Japan.
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27
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Piercy RJ, Zhou H, Feng L, Pombo A, Muntoni F, Brown SC. Desmin immunolocalisation in autosomal dominant Emery-Dreifuss muscular dystrophy. Neuromuscul Disord 2007; 17:297-305. [PMID: 17329105 DOI: 10.1016/j.nmd.2007.01.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2006] [Revised: 12/06/2006] [Accepted: 01/04/2007] [Indexed: 01/17/2023]
Abstract
Autosomal dominant Emery-Dreifuss muscular dystrophy (AD-EDMD) is one of a number of allelic disorders caused by mutations in the nuclear lamina proteins, lamins A and C. The disorder is characterised by the early onset of skeletal muscle weakness and joint contractures and later, by dilated cardiomyopathy and cardiac arrythmias. Although the pathophysiology is not understood, one theory suggests that disordered structural organisation at weakened nuclei in contractile cells may underlie the disease. Previous work shows that mice deficient in lamin A/C develop similar skeletal and cardiac muscle signs to patients with AD-EDMD and ultrastructural examination of muscle from these mice shows abnormal localisation of desmin. We hypothesised therefore that desmin localisation may be abnormal in muscle or cells from patients with AD-EDMD and/or in cells expressing mutant lamins. In order to evaluate this, desmin immunolocalisation was determined in skeletal muscle biopsy sections from patients with AD-EDMD and cell lines including MyoD-transfected fibroblast-derived myotubes from AD-EDMD patients and murine embryonic stem cell-derived cardiomyocytes stably transfected with mutant human lamin A. Ultrastructural examination of patient muscle was also performed. Desmin was expressed and localised normally in patient muscle and cell lines and ultrastructural examination was similar to controls. These results fail to provide any evidence that dominant mutations in lamin A/C lead to a disorganisation of the desmin associated cytoskeleton.
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Affiliation(s)
- Richard J Piercy
- Dubowitz Neuromuscular Unit, Department of Paediatrics, Hammersmith Hospital, Imperial College, London, United Kingdom.
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28
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Yuri T, Miki K, Tsukamoto R, Shinde A, Kusaka H, Tsubura A. Autopsy case of desminopathy involving skeletal and cardiac muscle. Pathol Int 2007; 57:32-6. [PMID: 17199740 DOI: 10.1111/j.1440-1827.2007.02053.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Desminopathy is a familial or sporadic skeletal and cardiac muscular dystrophy caused by mutation in the desmin gene. Desmin-reactive deposits in the affected muscles are the morphological hallmarks of this disease. Herein is reported an autopsy case of a 57-year-old Japanese man with adult-onset skeletal muscle weakness and atrioventricular (A-V) conducting block, with a missense A337P mutation in exon 5 of the desmin gene. Disease onset occurred when the patient was 45 years old. The initial presentation was lower limb weakness, and the weakness progressed to the upper limbs. When the patient was 51 years old, a cardiac pacemaker was implanted due to complete A-V block. When the patient was 53 years old, respiratory insufficiency occurred due to weakness of respiratory muscles, and the patient died at the age of 57 years. On autopsy, intrasarcoplasmic desmin-immunoreactive deposits were identified in the skeletal and cardiac muscle, and abnormal accumulations of granulofilamentous material were identified at the ultrastructural level. In the cardiac conducting system, calcification was observed at the bundle of His, and sporadic calcium deposits were observed at the left and right bundle branches.
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Affiliation(s)
- Takashi Yuri
- Department of Pathology II, Kansai Medical University, Moriguchi, Osaka, Japan
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29
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Arias M, Pardo J, Blanco-Arias P, Sobrido MJ, Arias S, Dapena D, Carracedo A, Goldfarb LG, Navarro C. Distinct phenotypic features and gender-specific disease manifestations in a Spanish family with desmin L370P mutation. Neuromuscul Disord 2006; 16:498-503. [PMID: 16806931 DOI: 10.1016/j.nmd.2006.05.011] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2006] [Revised: 05/16/2006] [Accepted: 05/24/2006] [Indexed: 11/25/2022]
Abstract
Desminopathies represent a subtype of myofibrillar myopathy caused by mutations in the DES gene, which cause myofibril disruption and intracellular inclusions containing desmin and other protein components. Desminopathy mainly involves skeletal and cardiac muscle, separately or together. Both autosomal dominant and autosomal recessive inheritance have been reported. Here, we describe the second family identified to date with an L370P desmin mutation. The disease in this family shows autosomal dominant inheritance with a particular phenotype, where males suffer from sudden death of cardiac origin while females exhibit a more benign myopathy of distal onset and slower progression. Because the only family previously identified with this mutation was limited to one studied patient, the present kindred represents the largest clinical investigation of the phenotype associated with the L370P mutation.
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Affiliation(s)
- Manuel Arias
- Department of Neurology, Hospital Clínico Universitario de Santiago de Compostela, Travesía da Choupana s/n, 15706 Santiago de Compostela, Spain.
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30
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Affiliation(s)
- Y Capetanaki
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, Texas 77030, USA.
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31
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Bär H, Strelkov SV, Sjöberg G, Aebi U, Herrmann H. The biology of desmin filaments: how do mutations affect their structure, assembly, and organisation? J Struct Biol 2005; 148:137-52. [PMID: 15477095 DOI: 10.1016/j.jsb.2004.04.003] [Citation(s) in RCA: 133] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2004] [Indexed: 12/31/2022]
Abstract
Desmin, the major intermediate filament (IF) protein of muscle, is evolutionarily highly conserved from shark to man. Recently, an increasing number of mutations of the desmin gene has been described to be associated with human diseases such as certain skeletal and cardiac myopathies. These diseases are histologically characterised by intracellular aggregates containing desmin and various associated proteins. Although there is progress regarding our knowledge on the cellular function of desmin within the cytoskeleton, the impact of each distinct mutation is currently not understood at all. In order to get insight into how such mutations affect filament assembly and their integration into the cytoskeleton we need to establish IF structure at atomic detail. Recent progress in determining the dimer structure of the desmin-related IF-protein vimentin allows us to assess how such mutations may affect desmin filament architecture.
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Affiliation(s)
- Harald Bär
- Department of Cell Biology, German Cancer Research Center (DKFZ), Heidelberg D-69120, Germany
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32
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Lowe J, Hand N, Mayer RJ. Application of Ubiquitin Immunohistochemistry to the Diagnosis of Disease. Methods Enzymol 2005; 399:86-119. [PMID: 16338351 DOI: 10.1016/s0076-6879(05)99007-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/05/2023]
Abstract
Ubiquitin immunohistochemistry has changed understanding of the pathophysiology of many diseases, particularly chronic neurodegenerative diseases. Protein aggregates (inclusions) containing ubiquitinated proteins occur in neurones and other cell types in the central nervous system in afflicted cells. The inclusions are present in all the neurological illnesses, including Alzheimer's disease, Parkinson's disease, amyotrophic lateral sclerosis, polyglutamine diseases, and rarer forms of neurodegenerative disease. A new cause of cognitive decline in the elderly, "dementia with Lewy bodies," accounting for some 15-30% of cases, was initially discovered and characterized by ubiquitin immunocytochemistry. The optimal methods for carrying out immunohistochemical analyses of paraffin-embedded tissues are described, and examples of all the types of intracellular inclusions detected by ubiquitin immunohistochemistry in the diseases are illustrated. The role of the ubiquitin proteasome system (UPS) in disease progression is being actively researched globally and increasingly, because it is now realized that the UPS controls most pathways in cellular homeostasis. Many of these regulatory mechanisms will be dysfunctional in diseased cells. The goal is to understand fully the role of the UPS in the disorders and then therapeutically intervene in the ubiquitin pathway to treat these incurable diseases.
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Affiliation(s)
- James Lowe
- School of Molecular Medical Sciences, University of Nottingham Medical School, Queens Medical Centre, Nottingham, United Kingdom
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33
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Abstract
A recently identified class of myopathies is produced by abnormal desmin, and is characterized by a disorganization of the desmin filament network, the accumulation of insoluble desmin-containing aggregates, and destructive changes in the sarcomeric organization of striated muscles. The desmin filaments interact with various other cytoskeletal proteins. The distinct clinical phenotypes are heterogeneous, with progressive skeletal myopathy, cardiomyopathy, and respiratory insufficiency as the most prominent features. Most of the desmin mutations are autosomal dominant. Identification of the causal genetic mutations shows that the desmin gene is not the only gene implicated in desminopathies; other genes encoding desmin-associated proteins, such as alpha-B-crystallin, and synemin may also be involved. Patients with mutations in their alpha-B-crystallin gene, which produce similar skeletal and cardiac myopathies, also have opaque lenses. Knockout mice have helped to reveal the fundamental role of desmin filaments in cell architecture, sarcomere alignment, myofibril organization, and the distribution of mitochondria. Transgenic mice, which accumulate aggregates of desmin and associated proteins in their muscles, show that the loss of desmin intermediate function as a result of mutations in desmin itself, or in the desmin-associated constituents, is important for disease progression.
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Affiliation(s)
- Denise Paulin
- Université Denis-Diderot Paris 7, Case 7136, Biologie Moleculaire de la Differenciation, 2 Place Jussieu, 75251 Paris Cedex, France.
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34
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Olivé M, Goldfarb L, Moreno D, Laforet E, Dagvadorj A, Sambuughin N, Martínez-Matos JA, Martínez F, Alió J, Farrero E, Vicart P, Ferrer I. Desmin-related myopathy: clinical, electrophysiological, radiological, neuropathological and genetic studies. J Neurol Sci 2004; 219:125-37. [PMID: 15050448 DOI: 10.1016/j.jns.2004.01.007] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2003] [Revised: 12/16/2003] [Accepted: 01/05/2004] [Indexed: 11/24/2022]
Abstract
Ten Spanish patients from six unrelated families diagnosed with desmin-related myopathy (DRM) were studied. The pattern of DRM inheritance was autosomal dominant in three families, autosomal recessive in one, and there was no family history in two cases. The disease onset was in early adulthood. Cardiac myopathy was the initial presentation in two patients, respiratory insufficiency in one, and lower limb weakness in all others. Cardiac involvement was observed in four patients. Lens opacities were found in four. CK level was normal or slightly elevated, and electrophysiological examination was consistent with myopathy. Muscle biopsies identified intracytoplasmic desmin-immunoreactive inclusions. In addition to desmin, synemin, actin, gelsolin, ubiquitin, alphaB-crystallin and amyloid betaA4 were also present in the deposits. Ultrastructural examination revealed areas of myofibrillary disruption, abnormal electron-dense structures and accumulations of granulofilamentous material. A missense R406W mutation and a novel single amino acid deletion in the desmin gene were identified in two patients; the other patients did not show mutations in desmin, synemin, syncoilin or alphaB-crystallin genes. Analysis of 10 Spanish DRM cases illustrates a wide clinical, myopathological and genetic spectrum of DRM, reinforcing the need for further exploration of genetic causes for this group of disorders.
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Affiliation(s)
- Montse Olivé
- Institut de Neuropatologia, Hospital de Bellvitge, C/Feixa Llarga s/n degrees, 08907 Hospitalet de Llobregat, Barcelona, Spain.
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35
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Ferreiro A, Ceuterick-de Groote C, Marks JJ, Goemans N, Schreiber G, Hanefeld F, Fardeau M, Martin JJ, Goebel HH, Richard P, Guicheney P, Bönnemann CG. Desmin-related myopathy with mallory body-like inclusions is caused by mutations of the selenoprotein N gene. Ann Neurol 2004; 55:676-86. [PMID: 15122708 DOI: 10.1002/ana.20077] [Citation(s) in RCA: 157] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Desmin-related myopathies (DRMs) are a heterogeneous group of muscle disorders, morphologically defined by intrasarcoplasmic aggregates of desmin. Mutations in the desmin and the alpha-B crystallin genes account for approximately one third of the DRM cases. The genetic basis of the other forms remain unknown, including the early-onset, recessive form with Mallory body-like inclusions (MB-DRMs), first described in five related German patients. Recently, we identified the selenoprotein N gene (SEPN1) as responsible for SEPN-related myopathy (SEPN-RM), a unique early-onset myopathy formerly divided in two different nosological categories: rigid spine muscular dystrophy and the severe form of classical multiminicore disease. The finding of Mallory body-like inclusions in two cases of genetically documented SEPN-RM led us to suspect a relationship between MB-DRM and SEPN1. In the original MB-DRM German family, we demonstrated a linkage of the disease to the SEPN1 locus (1p36), and subsequently a homozygous SEPN1 deletion (del 92 nucleotide -19/+73) in the affected patients. A comparative reevaluation showed that MB-DRM and SEPN-RM share identical clinical features. Therefore, we propose that MB-DRM should be categorized as SEPN-RM. These findings substantiate the molecular heterogeneity of DRM, expand the morphological spectrum of SEPN-RM, and implicate a necessary reassessment of the nosological boundaries in early-onset myopathies.
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Affiliation(s)
- Ana Ferreiro
- Institut National de la Santé et de la Recherche Médicale U582, Institut de Myologie, Groupe Hospitalier Pitié-Salpêtrière, Paris, France.
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36
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Mizuno Y, Guyon JR, Watkins SC, Mizushima K, Sasaoka T, Imamura M, Kunkel LM, Okamoto K. ?-synemin localizes to regions of high stress in human skeletal myofibers. Muscle Nerve 2004; 30:337-46. [PMID: 15318345 DOI: 10.1002/mus.20111] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Synemin is an intermediate filament protein shown previously to interact with alpha-dystrobrevin and desmin. Immunoblot analysis detects a beta-synemin protein of 170 kDa in human skeletal muscle and an alpha-synemin protein of 225 kDa in monkey brain. Low-resolution immunohistochemical analysis localizes beta-synemin within muscle along the sarcolemma, whereas confocal microscopic analysis further refines localization to the costamere and muscle Z-lines. In addition to these locations, beta-synemin is also enriched at the neuromuscular and myotendinous junctions, other regions that undergo high stress during myofiber contraction. Based on its localization and its expression pattern, it is proposed that beta-synemin functions as a structural protein involved in maintaining muscle integrity through its interactions with alpha-dystrobrevin, desmin, and other structural proteins.
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Affiliation(s)
- Yuji Mizuno
- Department of Neurology, Gunma University Graduate School of Medicine, 3-39-22 Showa, Maebashi, Gunma 371-8511, Japan.
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37
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Kaminska A, Strelkov SV, Goudeau B, Olivé M, Dagvadorj A, Fidzianska A, Simon-Casteras M, Shatunov A, Dalakas MC, Ferrer I, Kwiecinski H, Vicart P, Goldfarb LG. Small deletions disturb desmin architecture leading to breakdown of muscle cells and development of skeletal or cardioskeletal myopathy. Hum Genet 2003; 114:306-13. [PMID: 14648196 DOI: 10.1007/s00439-003-1057-7] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2003] [Accepted: 10/21/2003] [Indexed: 01/13/2023]
Abstract
Desmin ( DES) mutations have been recognized as a cause of desmin-related myopathy (OMIM 601419), or desminopathy, a disease characterized by progressive limb muscle weakness and accumulation of desmin-reactive granular aggregates in the myofibers. We have studied three families with skeletal or cardioskeletal myopathy caused by small in-frame deletions in the desmin gene. The newly identified in-frame deletions E359_S361del and N366del alter the heptad periodicity within a critical 2B coiled-coil segment. Structural analysis reveals that the E359_S361 deletion introduces a second stutter immediately downstream of the naturally occurring stutter, thus doubling the extent of the local coiled-coil unwinding. The N366del mutation converts the wild-type stutter into a different type of discontinuity, a stammer. A stammer, as opposed to a stutter, is expected to cause an extra overwinding of the coiled-coil. These mutations alter the coiled-coil geometry in specific ways leading to fatal damage to desmin filament assembly. Expression studies in two cell lines confirm the inability of desmin molecules with this changed architecture to polymerize into a functional filamentous network. This study provides insights into molecular pathogenetic mechanisms of desmin mutation-associated skeletal and cardioskeletal myopathy.
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Affiliation(s)
- Anna Kaminska
- Neuromuscular Unit, Medical Research Center, Polish Academy of Sciences, Warsaw, Poland
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38
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Abstract
The congenital myopathies and congenital muscular dystrophies are a group of relatively infrequent neuromuscular disorders. Ultimate understanding of these disorders, however, will undoubtedly shed considerable light on skeletal muscle development and function. Three classical congenital myopathies are central core disease, nemaline myopathy, and centronuclear myopathy. The congenital muscular dystrophies are often distinguished by whether or not they are associated with clinically evident cerebral involvement.
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Affiliation(s)
- Jack E Riggs
- Department of Neurology, West Virginia University School of Medicine, Health Sciences Center, One Medical Center Drive, Room G-103, Box 9180, Morgantown, WV 26506-9180, USA.
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39
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Olivé M, Goldfarb L, Dagvadorj A, Sambuughin N, Paulin D, Li Z, Goudeau B, Vicart P, Ferrer I. Expression of the intermediate filament protein synemin in myofibrillar myopathies and other muscle diseases. Acta Neuropathol 2003; 106:1-7. [PMID: 12669240 DOI: 10.1007/s00401-003-0695-0] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2003] [Revised: 02/17/2003] [Accepted: 02/17/2003] [Indexed: 10/25/2022]
Abstract
Synemin is a member of the intermediate protein superfamily. Previous studies in avian and rodent skeletal and cardiac muscles have demonstrated that synemin localises at the Z-band, where it associates with desmin and alpha-actinin. In the present study, the distribution of synemin was examined using immunohistochemistry in muscle biopsy specimens from patients suffering from myofibrillar myopathy (MM, n=6), dermatomyositis (DM, n=3), inclusion body myositis (IBM, n=5), oculopharyngeal muscular dystrophy (OPD, n=3) and denervation atrophy (DA, n=3), to investigate the possible participation of this protein in the pathogenesis of various muscular diseases. Of patients affected by MM, two showed the presence of mutations in the desmin gene; none had mutations in the alphaB-crystallin gene; and no mutations were identified in synemin or syncoilin genes of three patients. Synemin immunohistochemistry disclosed a faint staining corresponding to the Z-bands in the cytoplasm of control muscle fibres; in contrast, focal aggregates of synemin were seen in patients with MM. Increased synemin immunoreactivity was identified diffusely or in the subsarcolemmal space of scattered fibres in patients with DM, and in vacuolated fibres of patients with IBM and OPD. Strong synemin immunoreactivity was observed in target formations and atrophic fibres of patients with denervating disorders, as well as in atrophic fibres, regardless of their origin, in all patients studied. Synemin co-localised with desmin, as seen on consecutive serial sections immunostained with anti-synemin or anti-desmin antibodies. These observations demonstrate abnormal accumulations containing both synemin and desmin in muscle fibres in patients with MM, IBM, DM, OPD and DA. Considering the important role of synemin as one of intermediate filaments of skeletal and cardiac muscle, its destruction and accumulation in the intracellular debris suggest that synemin may participate in the pathogenesis of these disorders.
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Affiliation(s)
- Montse Olivé
- Institut de Neuropatologia, Ciutat Sanitària i Universitària de Bellvitge, C/Feixa Llarga s/n masculine, 08907 Hospitalet de Llobregat, Spain.
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40
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Dagvadorj A, Goudeau B, Hilton-Jones D, Blancato JK, Shatunov A, Simon-Casteras M, Squier W, Nagle JW, Goldfarb LG, Vicart P. Respiratory insufficiency in desminopathy patients caused by introduction of proline residues in desmin c-terminal alpha-helical segment. Muscle Nerve 2003; 27:669-75. [PMID: 12766977 DOI: 10.1002/mus.10370] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Mutations in desmin gene have been identified in patients with cardiac and skeletal myopathy characterized by intracytoplasmic accumulation of desmin-reactive deposits and electron-dense granular aggregates. We characterized two new desminopathy families with unusual features of adult-onset, slowly progressive, diffuse skeletal myopathy and respiratory insufficiency. Progressive reduction of respiratory muscle strength became clinically detectable between the 3rd and the 8th years of illness and led to recurrent chest infections and death in one of the patients. Novel mutations, A357P and L370P, predicted to introduce proline residue into a highly conserved alpha-helical region of desmin, were identified. Proline is known to disrupt the alpha-helix. In addition, the A357P mutation distorts a unique stutter sequence that is considered to be critically important for proper filament assembly. Functional assessment in two cell-lines, one of which does and the other of which does not constitutively produce type III intermediate filaments, demonstrated the inability of mutant desmin carrying either the A357P or the L370P mutation to polymerize and form an intracellular filamentous network. The results of this study indicate that respiratory insufficiency is an intrinsic feature of disease associated with specific desmin mutations; in some patients, respiratory weakness may present as a dominant clinical manifestation and a major cause of disability and death.
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Affiliation(s)
- Ayush Dagvadorj
- Clinical Neurogenetics Unit, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bldg. 10, Room 4B37, 10 Central Dr., MSC 1361, Bethesda, Maryland 20892-1361, USA
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41
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Clark KA, McElhinny AS, Beckerle MC, Gregorio CC. Striated muscle cytoarchitecture: an intricate web of form and function. Annu Rev Cell Dev Biol 2003; 18:637-706. [PMID: 12142273 DOI: 10.1146/annurev.cellbio.18.012502.105840] [Citation(s) in RCA: 472] [Impact Index Per Article: 22.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Striated muscle is an intricate, efficient, and precise machine that contains complex interconnected cytoskeletal networks critical for its contractile activity. The individual units of the sarcomere, the basic contractile unit of myofibrils, include the thin, thick, titin, and nebulin filaments. These filament systems have been investigated intensely for some time, but the details of their functions, as well as how they are connected to other cytoskeletal elements, are just beginning to be elucidated. These investigations have advanced significantly in recent years through the identification of novel sarcomeric and sarcomeric-associated proteins and their subsequent functional analyses in model systems. Mutations in these cytoskeletal components account for a large percentage of human myopathies, and thus insight into the normal functions of these proteins has provided a much needed mechanistic understanding of these disorders. In this review, we highlight the components of striated muscle cytoarchitecture with respect to their interactions, dynamics, links to signaling pathways, and functions. The exciting conclusion is that the striated muscle cytoskeleton, an exquisitely tuned, dynamic molecular machine, is capable of responding to subtle changes in cellular physiology.
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Affiliation(s)
- Kathleen A Clark
- Department of Cell Biology, University of Arizona, Tucson 85724, USA
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42
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Dalakas MC, Dagvadorj A, Goudeau B, Park KY, Takeda K, Simon-Casteras M, Vasconcelos O, Sambuughin N, Shatunov A, Nagle JW, Sivakumar K, Vicart P, Goldfarb LG. Progressive skeletal myopathy, a phenotypic variant of desmin myopathy associated with desmin mutations. Neuromuscul Disord 2003; 13:252-8. [PMID: 12609507 DOI: 10.1016/s0960-8966(02)00271-7] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Desmin myopathy is a familial or sporadic disorder characterized by the presence of desmin mutations that cause skeletal muscle weakness associated with cardiac conduction block, arrhythmia and heart failure. Distinctive histopathologic features include intracytoplasmic accumulation of desmin-reactive deposits and electron-dense granular aggregates in skeletal and cardiac muscle cells. We describe two families with features of adult-onset slowly progressive skeletal myopathy without cardiomyopathy. N342D point mutation was present in the desmin helical rod domain in patients of family 1, and I451M mutation was found in the non-helical tail domain in patients of family 2. Of interest, the same I451M mutation has previously been reported in patients with cardiomyopathy and no signs of skeletal myopathy. Some carriers of the I451M mutation did not develop any disease, suggesting incomplete penetrance. Expression studies demonstrated inability of the N342D mutant desmin to form cellular filamentous network, confirming the pathogenic role of this mutation, but the network was not affected by the tail-domain I451M mutation. Progressive skeletal myopathy is a rare phenotypic variant of desmin myopathy allelic to the more frequent cardio-skeletal form.
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Affiliation(s)
- Marinos C Dalakas
- National Institute of Neurological Disorders and Stroke, National Institutes of Health, Building 10, Room 4B37, 10 Central Drive, MSC 1361, Bethesda, MD 20892, USA
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43
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Haubold K, Herrmann H, Langer SJ, Evans RM, Leinwand LA, Klymkowsky MW. Acute effects of desmin mutations on cytoskeletal and cellular integrity in cardiac myocytes. CELL MOTILITY AND THE CYTOSKELETON 2003; 54:105-21. [PMID: 12529857 DOI: 10.1002/cm.10090] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Mutations in desmin have been associated with a subset of human myopathies. Symptoms typically appear in the second to third decades of life, but in the most severe cases can manifest themselves earlier. How desmin mutations lead to aberrant muscle function, however, remains poorly defined. We created a series of four mutations in rat desmin and tested their in vitro filament assembly properties. RDM-G, a chimera between desmin and green fluorescent protein, formed protofilament-like structures in vitro. RDM-1 and RDM-2 blocked in vitro assembly at the unit-length filament stage, while RDM-3 had more subtle effects on assembly. When expressed in cultured rat neonatal cardiac myocytes via adenovirus infection, these mutant proteins disrupted the endogenous desmin filament to an extent that correlated with their defects in in vitro assembly properties. Disruption of the desmin network by RDM-1 was also associated with disruption of plectin, myosin, and alpha-actinin organization in a significant percentage of infected cells. In contrast, expression of RDM-2, which is similar to previously characterized human mutant desmins, took longer to disrupt desmin and plectin organization and had no significant effect on myosin or alpha-actinin organization over the 5-day time course of our studies. RDM-3 had the mildest effect on in vitro assembly and no discernable effect on either desmin, plectin, myosin, or alpha-actinin organization in vivo. These results indicate that mutations in desmin have both direct and indirect effects on the cytoarchitecture of cardiac myocytes.
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Affiliation(s)
- Kurt Haubold
- Molecular, Cellular and Developmental Biology, University of Colorado, Boulder, CO 80309-0347, USA
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44
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Abstract
Although most muscle disorders produce proximal weakness, some myopathies may manifest predominantly or exclusively distal weakness. Although several congenital, inflammatory, or metabolic myopathies may produce mainly distal weakness, there are several distinct entities, typically referred to as distal myopathies. Most of these are inherited conditions. The distal myopathies are rare, but characteristic clinical and histological features aid in their identification. Advances in molecular genetics have led to the identification of the gene lesions responsible for several of these entities and have also expanded our understanding of the genetic relationships of distal myopathies to other inherited disorders of muscle. This review summarizes current knowledge of the clinical and molecular aspects of the distal myopathies.
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Affiliation(s)
- D S Saperstein
- Department of Neurology, Wilford Hall Medical Center, 2200 Bergquist Drive, Suite 1 (MMCNN), San Antonio, Texas 78236-5300, USA.
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45
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Abstract
The dynamic and critical role of intermediate filaments in muscle is highlighted by myopathies characterized by aberrant accumulation of intermediate filaments. In some affected patients, mutations in genes encoding intermediate filaments that are expressed in muscle have been confirmed. The importance of intermediate filaments in muscle is further strengthened by murine models in which genetically designed intermediate filament mutations are expressed, leading to progressive skeletal or cardioskeletal myopathy in affected mice. In this article the intermediate filaments expressed in muscle are reviewed, and the clinical and pathologic features of myopathies known to relate to intermediate filaments are described. With the increasing awareness of intermediate filaments in muscle and the rapid advances in genetic investigation, it is likely that the list of intermediate filament-related myopathies will expand.
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Affiliation(s)
- B L Banwell
- Department of Pediatrics (Neurology), The Hospital for Sick Children, Toronto, Canada
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46
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Zhang J, Kumar A, Stalker HJ, Virdi G, Ferrans VJ, Horiba K, Fricker FJ, Wallace MR. Clinical and molecular studies of a large family with desmin-associated restrictive cardiomyopathy. Clin Genet 2001; 59:248-56. [PMID: 11298680 DOI: 10.1034/j.1399-0004.2001.590406.x] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Patients with restrictive cardiomyopathy (RC) have impaired diastolic function, but intact systolic function until later stages of the disease, ultimately leading to heart failure. Primary RC is often sporadic, but also may be inherited in an autosomal dominant fashion, particularly the idiopathic forms. Recently there has been great interest in inherited cardiomyopathy associated with myocyte desmin deposition ('desminopathies'). In some such families, desmin or alpha-B crystallin gene mutation is the underlying cause, and the desmin accumulation affects skeletal muscle as well, usually causing skeletal myopathy. We describe a large family with apparent autosomal dominant inheritance of desmin-associated RC spanning four generations, with the age of onset and severity/rate of progression being highly variable. This family is relatively unique in that there is no symptom-based evidence of skeletal muscle involvement, and the known desminopathy and cardiomyopathy genes/loci have been ruled out. These data support literature suggesting that desmin deposition may be associated with different underlying gene defects, and that a novel desminopathy gene is responsible for the condition in this family.
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Affiliation(s)
- J Zhang
- Division of Genetics, Department of Pediatrics, University of Florida College of Medicine, Gainesville, FL 32610-0266, USA
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47
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Peña J, Luque E, Noguera F, Jimena I, Vaamonde R. Experimental induction of ring fibers in regenerating skeletal muscle. Pathol Res Pract 2001; 197:21-7. [PMID: 11209813 DOI: 10.1078/0344-0338-00004] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Light microscopy and electron microscopy were used to study the formation of ring fibers induced experimentally in regenerating muscle subjected to tenotomy-induced tension deficiency. Anterior tibial rat muscles were injured by intramuscular injection of mepivacain, tenotomized at varying stages of the regenerative process, and analyzed 30 days after sectioning the tendon. The combination of regeneration and tenotomy led to the appearance of ring fibers at different developmental stages. Ring fibers were not observed in regenerating control muscles and were scarce in tenotomized controls. Our results showed that the regenerative phase in which tension deficiency was established had a significant influence on the number of developing ring fibers; the number increased when tenotomy was performed during subsarcolemmic myofibrillogenesis in regenerating fibers. As a consequence, one might hypothesize that tension deficiency during muscle fiber repair plays a critical role in ring fiber formation.
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MESH Headings
- Animals
- Desmin/analysis
- Immunohistochemistry
- Male
- Mepivacaine/pharmacology
- Models, Animal
- Muscle Fibers, Skeletal/chemistry
- Muscle Fibers, Skeletal/drug effects
- Muscle Fibers, Skeletal/physiology
- Muscle Fibers, Skeletal/ultrastructure
- Muscle, Skeletal/chemistry
- Muscle, Skeletal/cytology
- Muscle, Skeletal/drug effects
- Muscle, Skeletal/physiology
- Rats
- Rats, Wistar
- Regeneration/drug effects
- Regeneration/physiology
- Tendons/surgery
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Affiliation(s)
- J Peña
- Department of Morphological Sciences, Faculty of Medicine, University of Córdoba, Spain.
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48
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Abstract
Desmin, the main intermediate filament (IF) protein in skeletal and heart muscle cells, is of great importance as a part of the cytoskeleton. The IFs surround and interlink myofibrils, and connect the peripheral myofibrils with the sarcolemma. In myotendinous junctions and neuromuscular junctions of skeletal muscle fibres, desmin is enriched. In the heart, desmin is increased at intercalated discs, the attachment between cardiomyocytes, and it is the main component in Purkinje fibres of the conduction system. Desmin is the first muscle-specific protein to appear during myogenesis. Nevertheless, lack of desmin, as shown from experiments with desmin knockout (K/O) mice, does not influence myogenesis or myofibrillogenesis. However, the desmin knock-out mice postnatally develop a cardiomyopathy and a muscle dystrophy in highly used skeletal muscles. In other skeletal muscles the organization of myofibrils is remarkably unaffected. Thus, the main consequence of the lack of desmin is that the muscle fibres become more susceptible to damage. The loss of membrane integrity leads to a dystrophic process, with degeneration and fibrosis. In the heart cardiac failure develops, whereas in affected skeletal muscles regenerative attempts are seen. In humans, accumulations of desmin have been a hallmark for presumptive desmin myopathies. Recent investigations have shown that some families with such a myopathy have a defect in the gene coding for alphaB-crystallin, whereas others have mutations in the desmin gene. Typical features of these patients are cardiac affections and muscle weakness. Thus, mutations in the desmin gene is pathogenic for a distinct type of muscle disorder.
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Affiliation(s)
- L Carlsson
- Department of Integrative Medical Biology, Section for Anatomy, Umeå University, and Centre for Musculoskeletal Research, National Institute of Working Life, Umeå, Sweden
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Zimprich F, Djamshidian A, Hainfellner JA, Budka H, Zeitlhofer J. An autosomal dominant early adult-onset distal muscular dystrophy. Muscle Nerve 2000; 23:1876-9. [PMID: 11102913 DOI: 10.1002/1097-4598(200012)23:12<1876::aid-mus13>3.0.co;2-a] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
In this study we describe an autosomal dominant distal muscular dystrophy in a small Austrian family. The myopathy started in early adulthood with a slowly progressive weakness of the muscles of the anterior tibial compartment, followed by the long finger extensors and sternocleidomastoids in some family members. Other muscles were spared. Histopathology showed fiber size variation and autophagic vacuoles. This disease pattern is similar to Laing distal myopathy, which has been described previously in only one other family.
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Affiliation(s)
- F Zimprich
- Universitätsklinik für Neurologie, Allgemeines Krankenhaus der Stadt Wien, Währinger Gürtel 18-20, 1090 Vienna, Austria.
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50
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Wieneke S, Stehle R, Li Z, Jockusch H. Generation of tension by skinned fibers and intact skeletal muscles from desmin-deficient mice. Biochem Biophys Res Commun 2000; 278:419-25. [PMID: 11097852 DOI: 10.1006/bbrc.2000.3810] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We have investigated the physiological role of desmin in skeletal muscle by measuring isometric tension generated in skinned fibres and intact skeletal muscles from desmin knock-out (DES-KO) mice. About 80% of skinned single extensor digitorum longus (EDL) fibres from adult DES-KO mice generated tensions close to that of wild-type (WT) controls. Weights and maximum tensions of intact EDL but not of soleus (SOL) muscles were lowered in DES-KO mice. Repeated contractions with stretch did not affect subsequent isometric tension in EDL muscles of DES-KO mice. Tension during high frequency fatigue (HFF) declined faster and this deficiency was compensated in DES-KO EDL muscles by 5 mM caffeine which had no influence on HFF in WT EDL. Furthermore, caffeine evoked twitch potentiation was higher in DES-KO than in WT muscles. We conclude that desmin is not essential for acute tensile strength but rather for optimal activation of intact myofibres during E-C coupling.
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Affiliation(s)
- S Wieneke
- Developmental Biology Unit, University of Bielefeld, Bielefeld, D-33501, Germany
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