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Endoplasmic Reticulum Stress Induces Myostatin High Molecular Weight Aggregates and Impairs Mature Myostatin Secretion. Mol Neurobiol 2018; 55:8355-8373. [PMID: 29546591 PMCID: PMC6153721 DOI: 10.1007/s12035-018-0997-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Accepted: 03/07/2018] [Indexed: 01/08/2023]
Abstract
Sporadic inclusion body myositis (sIBM) is the most prevalent acquired muscle disorder in the elderly with no defined etiology or effective therapy. Endoplasmic reticulum stress and deposition of myostatin, a secreted negative regulator of muscle growth, have been implicated in disease pathology. The myostatin signaling pathway has emerged as a major target for symptomatic treatment of muscle atrophy. Here, we systematically analyzed the maturation and secretion of myostatin precursor MstnPP and its metabolites in a human muscle cell line. We find that increased MsntPP protein levels induce ER stress. MstnPP metabolites were predominantly retained within the endoplasmic reticulum (ER), also evident in sIBM histology. MstnPP cleavage products formed insoluble high molecular weight aggregates, a process that was aggravated by experimental ER stress. Importantly, ER stress also impaired secretion of mature myostatin. Reduced secretion and aggregation of MstnPP metabolites were not simply caused by overexpression, as both events were also observed in wildtype cells under ER stress. It is tempting to speculate that reduced circulating myostatin growth factor could be one explanation for the poor clinical efficacy of drugs targeting the myostatin pathway in sIBM.
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Catalán-García M, Garrabou G, Morén C, Guitart-Mampel M, Gonzalez-Casacuberta I, Hernando A, Gallego-Escuredo JM, Yubero D, Villarroya F, Montero R, O-Callaghan AS, Cardellach F, Grau JM. BACE-1, PS-1 and sAPPβ Levels Are Increased in Plasma from Sporadic Inclusion Body Myositis Patients: Surrogate Biomarkers among Inflammatory Myopathies. Mol Med 2015; 21:817-823. [PMID: 26552061 DOI: 10.2119/molmed.2015.00168] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2015] [Accepted: 10/27/2015] [Indexed: 12/26/2022] Open
Abstract
Sporadic inclusion body myositis (sIBM) is a rare disease that is difficult to diagnose. Muscle biopsy provides three prominent pathological findings: inflammation, mitochondrial abnormalities and fibber degeneration, represented by the accumulation of protein depots constituted by β-amyloid peptide, among others. We aim to perform a screening in plasma of circulating molecules related to the putative etiopathogenesis of sIBM to determine potential surrogate biomarkers for diagnosis. Plasma from 21 sIBM patients and 20 age- and gender-paired healthy controls were collected and stored at -80°C. An additional population of patients with non-sIBM inflammatory myopathies was also included (nine patients with dermatomyositis and five with polymyositis). Circulating levels of inflammatory cytokines (interleukin [IL]-6 and tumor necrosis factor [TNF]-α), mitochondrial-related molecules (free plasmatic mitochondrial DNA [mtDNA], fibroblast growth factor-21 [FGF-21] and coenzyme-Q10 [CoQ]) and amyloidogenic-related molecules (beta-secretase-1 [BACE-1], presenilin-1 [PS-1], and soluble Aβ precursor protein [sAPPβ]) were assessed with magnetic bead-based assays, real-time polymerase chain reaction, enzyme-linked immunosorbent assay (ELISA) and high-pressure liquid chromatography (HPLC). Despite remarkable trends toward altered plasmatic expression of inflammatory and mitochondrial molecules (increased IL-6, TNF-α, circulating mtDNA and FGF-21 levels and decreased content in CoQ), only amyloidogenic degenerative markers including BACE-1, PS-1 and sAPPβ levels were significantly increased in plasma from sIBM patients compared with controls and other patients with non-sIBM inflammatory myopathies (p < 0.05). Inflammatory, mitochondrial and amyloidogenic degeneration markers are altered in plasma of sIBM patients confirming their etiopathological implication in the disease. Sensitivity and specificity analysis show that BACE-1, PS-1 and sAPPβ represent a good predictive noninvasive tool for the diagnosis of sIBM, especially in distinguishing this disease from polymyositis.
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Affiliation(s)
- Marc Catalán-García
- Laboratory of Muscle Research and Mitochondrial Function, Cellex-IDIBAPS, Faculty of Medicine, University of Barcelona, Department of Internal Medicine, Hospital Clinic of Barcelona, Barcelona, Spain
| | - Glòria Garrabou
- Laboratory of Muscle Research and Mitochondrial Function, Cellex-IDIBAPS, Faculty of Medicine, University of Barcelona, Department of Internal Medicine, Hospital Clinic of Barcelona, Barcelona, Spain
| | - Constanza Morén
- Laboratory of Muscle Research and Mitochondrial Function, Cellex-IDIBAPS, Faculty of Medicine, University of Barcelona, Department of Internal Medicine, Hospital Clinic of Barcelona, Barcelona, Spain
| | - Mariona Guitart-Mampel
- Laboratory of Muscle Research and Mitochondrial Function, Cellex-IDIBAPS, Faculty of Medicine, University of Barcelona, Department of Internal Medicine, Hospital Clinic of Barcelona, Barcelona, Spain
| | - Ingrid Gonzalez-Casacuberta
- Laboratory of Muscle Research and Mitochondrial Function, Cellex-IDIBAPS, Faculty of Medicine, University of Barcelona, Department of Internal Medicine, Hospital Clinic of Barcelona, Barcelona, Spain
| | - Adriana Hernando
- Laboratory of Muscle Research and Mitochondrial Function, Cellex-IDIBAPS, Faculty of Medicine, University of Barcelona, Department of Internal Medicine, Hospital Clinic of Barcelona, Barcelona, Spain
| | - Jose Miquel Gallego-Escuredo
- Department of Biochemistry and Molecular Biology, Institute of Biomedicine (University of Barcelona), University of Barcelona, and CIBEROBN, Barcelona, Spain
| | - Dèlia Yubero
- Clinical Biochemistry Department, Hospital Sant Joan de Déu, Barcelona, Spain, and CIBERER, Valencia, Spain
| | - Francesc Villarroya
- Department of Biochemistry and Molecular Biology, Institute of Biomedicine (University of Barcelona), University of Barcelona, and CIBEROBN, Barcelona, Spain
| | - Raquel Montero
- Clinical Biochemistry Department, Hospital Sant Joan de Déu, Barcelona, Spain, and CIBERER, Valencia, Spain
| | | | - Francesc Cardellach
- Laboratory of Muscle Research and Mitochondrial Function, Cellex-IDIBAPS, Faculty of Medicine, University of Barcelona, Department of Internal Medicine, Hospital Clinic of Barcelona, Barcelona, Spain
| | - Josep Maria Grau
- Laboratory of Muscle Research and Mitochondrial Function, Cellex-IDIBAPS, Faculty of Medicine, University of Barcelona, Department of Internal Medicine, Hospital Clinic of Barcelona, Barcelona, Spain
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Li K, Pu C, Huang X, Liu J, Mao Y, Lu X. Proteomic study of sporadic inclusion body myositis. Proteome Sci 2014; 12:45. [PMID: 25253997 PMCID: PMC4172931 DOI: 10.1186/s12953-014-0045-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2014] [Accepted: 08/13/2014] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Sporadic inclusion body myositis (s-IBM) is the most commonly occurring acquired inflammatory myopathy in elderly people (>45 years); however, pathogenic mechanisms are poorly understood and diagnostic tools are limited. In view of this, new therapeutic and diagnostic molecular markers for s-IBM need to be identified. EXPERIMENTAL DESIGN In this study, the proteomes from three s-IBM cases were compared with those from three cases of neurogenic muscular atrophy (control). Proteins were separated by 2-dimensional polyacrylamide gel electrophoresis and profiled by mass spectrometric sequencing and subsequently validated by western blot. RESULTS Differential expression was noted in 29 proteins (16 upregulated and 13 downregulated) in s-IBM compared with the control group. Functions of these proteins include oxidative stress response, regulation of apoptosis, signal transduction, and cytoskeleton. Expression of both amyloid precursor protein (APP) and αB-crystallin was increased in s-IBM cases. CONCLUSIONS Our study reveals a unique pattern of protein expression in s-IBM, which should be further investigated in a wider cohort of IBM patients to fully realize the potential diagnostic or therapeutic benefits.
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Affiliation(s)
- Ke Li
- Department of Geriatric Neurology, Chinese PLA General Hospital, Beijing, 100853 China
| | - Chuanqiang Pu
- Department of Neurology, Chinese PLA General Hospital, 28 Fuxing Road, Beijing, 100853 China
| | - Xusheng Huang
- Department of Neurology, Chinese PLA General Hospital, 28 Fuxing Road, Beijing, 100853 China
| | - Jiexiao Liu
- Department of Neurology, Chinese PLA General Hospital, 28 Fuxing Road, Beijing, 100853 China
| | - Yanling Mao
- Department of Neurology, Chinese PLA General Hospital, 28 Fuxing Road, Beijing, 100853 China
| | - Xianghui Lu
- Department of Neurology, Chinese PLA General Hospital, 28 Fuxing Road, Beijing, 100853 China
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Lee HK, Rocnik E, Fu Q, Kwon B, Zeng L, Walsh K, Querfurth H. Foxo/atrogin induction in human and experimental myositis. Neurobiol Dis 2013; 46:463-75. [PMID: 22590725 DOI: 10.1016/j.nbd.2012.02.011] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Skeletal muscle atrophy can occur rapidly in various fasting, cancerous, systemic inflammatory, deranged metabolic or neurogenic states. The ubiquitin ligase Atrogin-1 (MAFbx) is induced in animal models of these conditions, causing excessive myoprotein degradation. It is unknown if Atrogin upregulation also occurs in acquired human myositis. Intracellular β-amyloid (Aβi), phosphorylated neurofilaments, scattered infiltrates and atrophy involving selective muscle groups characterize human sporadic Inclusion Body Myositis (sIBM). In Polymyositis (PM), inflammation is more pronounced and atrophy is symmetric and proximal. IBM and PM share various inflammatory markers. We found that forkhead family transcription factor Foxo3A is directed to the nucleus and Atrogin-1 transcript is increased in both conditions. Expression of Aβ in transgenic mice and differentiated C2C12 myotubes was sufficient to upregulate Atrogin-1 mRNA and cause atrophy. Aβi reduces levels of p-Akt and downstream p-Foxo3A, resulting in Foxo3A translocation and Atrogin-1 induction. In a mouse model of autoimmune myositis, cellular inflammation alone was associated with similar Foxo3A and Atrogin changes. Thus, either Aβi accumulation or cellular immune stimulation may independently drive muscle atrophy in sIBM and PM, respectively, through pathways converging on Foxo and Atrogin-1. In sIBM it is additionally possible that both mechanisms synergize.
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Affiliation(s)
- Han-Kyu Lee
- Department of Neurology, Rhode Island Hospital, 593 Eddy Street, Providence, RI 02903, USA
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Abstract
Inclusion body myositis is a progressive disease of the skeletal muscle. Here, specific theories of its pathogenesis are reviewed and general considerations pertaining to modeling of this disease discussed. Understanding of inclusion body myositis disease mechanism remains extremely poor. Current published animal models do not represent the disease. Future studies need to consider the critical role of biomarkers and methodologic issues in their discovery.
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Affiliation(s)
- Steven A Greenberg
- Department of Neurology, Division of Neuromuscular Disease, Brigham and Women's Hospital, and Children's Hospital Informatics Program, Harvard Medical School, 75 Francis Street, Boston, MA 02115, USA.
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Current world literature. Curr Opin Neurol 2009; 22:554-61. [PMID: 19755870 DOI: 10.1097/wco.0b013e3283313b14] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Parker KC, Kong SW, Walsh RJ, Salajegheh M, Moghadaszadeh B, Amato AA, Nazareno R, Lin YY, Krastins B, Sarracino DA, Beggs AH, Pinkus JL, Greenberg SA. Fast-twitch sarcomeric and glycolytic enzyme protein loss in inclusion body myositis. Muscle Nerve 2009; 39:739-53. [PMID: 19291799 PMCID: PMC2753483 DOI: 10.1002/mus.21230] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Inclusion body myositis (IBM) is an inflammatory disease of skeletal muscle of unknown cause. To further understand the nature of the tissue injury in this disease, we developed methods for large-scale detection and quantitation of proteins in muscle biopsy samples and analyzed proteomic data produced by these methods together with histochemical, immunohistochemical, and microarray data. Twenty muscle biopsy samples from patients with inflammatory myopathies (n = 17) or elderly subjects without neuromuscular disease (n = 3) were profiled by proteomic studies using liquid chromatographic separation of peptides followed by mass spectrometry. Thirteen of the diseased samples additionally underwent microarray studies. Seventy muscle specimens from patients with a range of neuromuscular disorders were examined by ATPase histochemical methods. Smaller numbers of samples underwent immunohistochemical and immunoblot studies. Mass spectrometric studies identified and quantified approximately 300 total distinct proteins in each muscle sample. In IBM and to a lesser extent in polymyositis, proteomic studies confirmed by histochemical, immunohistochemical, and immunoblot studies showed loss of many fast-twitch specific structural proteins and glycolytic enzymes despite relative preservation of transcript levels. Increased abundance of a nuclear membrane protein, immunoglobulins, and two calpain-3 substrates were present. The atrophy present in IBM muscle is accompanied by preferential loss of fast-twitch structural proteins and glycolytic enzymes, particularly glycogen debranching enzyme, with relative preservation of the abundance of their respective transcripts. Although muscle atrophy has long been recognized in IBM, these studies are the first to report specific proteins which are reduced in quantity in IBM muscle.
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MESH Headings
- Actinin/deficiency
- Actinin/genetics
- Adult
- Aged
- Biopsy
- Calpain/analysis
- Calpain/metabolism
- Chromatography, Liquid
- Down-Regulation/genetics
- Enzymes/analysis
- Enzymes/deficiency
- Enzymes/genetics
- Glycogen Storage Disease Type III/diagnosis
- Glycolysis/genetics
- Humans
- Mass Spectrometry
- Middle Aged
- Muscle Fibers, Fast-Twitch/metabolism
- Muscle Fibers, Fast-Twitch/pathology
- Muscle Proteins/analysis
- Muscle Proteins/deficiency
- Muscle Proteins/genetics
- Muscle Proteins/metabolism
- Muscle, Skeletal/metabolism
- Muscle, Skeletal/pathology
- Muscle, Skeletal/physiopathology
- Myosin Heavy Chains/deficiency
- Myosin Heavy Chains/genetics
- Myositis, Inclusion Body/genetics
- Myositis, Inclusion Body/metabolism
- Myositis, Inclusion Body/physiopathology
- Nuclear Envelope/metabolism
- Proteomics/methods
- RNA, Messenger/analysis
- RNA, Messenger/metabolism
- Sarcomeres/metabolism
- Sarcomeres/pathology
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Affiliation(s)
- Kenneth C. Parker
- Harvard-Partners Center for Genetics and Genomics, Proteomics Core
- Department of Neurology, Brigham and Women's Hospital, Harvard Medical School
| | - Sek Won Kong
- Department of Cardiology, Children's Hospital Boston, Harvard Medical School
- Informatics Program, Children's Hospital Boston, Harvard Medical School
| | - Ronan J Walsh
- Department of Neurology, Brigham and Women's Hospital, Harvard Medical School
- Informatics Program, Children's Hospital Boston, Harvard Medical School
| | - Mohammad Salajegheh
- Department of Neurology, Brigham and Women's Hospital, Harvard Medical School
- Informatics Program, Children's Hospital Boston, Harvard Medical School
| | - Behzad Moghadaszadeh
- Division of Genetics, Program in Genomics, and The Manton Center for Orphan Disease Research, Children's Hospital Boston, Harvard Medical School
| | - Anthony A Amato
- Department of Neurology, Brigham and Women's Hospital, Harvard Medical School
| | - Remedios Nazareno
- Department of Neurology, Brigham and Women's Hospital, Harvard Medical School
- Informatics Program, Children's Hospital Boston, Harvard Medical School
| | - Yin Yin Lin
- Informatics Program, Children's Hospital Boston, Harvard Medical School
| | - Bryan Krastins
- Harvard-Partners Center for Genetics and Genomics, Proteomics Core
| | | | - Alan H Beggs
- Division of Genetics, Program in Genomics, and The Manton Center for Orphan Disease Research, Children's Hospital Boston, Harvard Medical School
| | - Jack L Pinkus
- Department of Neurology, Brigham and Women's Hospital, Harvard Medical School
- Informatics Program, Children's Hospital Boston, Harvard Medical School
| | - Steven A Greenberg
- Department of Neurology, Brigham and Women's Hospital, Harvard Medical School
- Informatics Program, Children's Hospital Boston, Harvard Medical School
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Karpati G, O'Ferrall EK. Sporadic inclusion body myositis: pathogenic considerations. Ann Neurol 2009; 65:7-11. [PMID: 19194875 DOI: 10.1002/ana.21622] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Sporadic inclusion body myositis is the commonest acquired disease of skeletal muscles after 50 years of age, and as such it has commanded a great deal of attention of investigators over the past 25 years. As a result, a large amount of information has accumulated concerning its clinical profile, myopathology, and immunopathology. In the myopathology and immunopathology, there is general agreement that the characteristic features could be divided into a degenerative and an inflammatory group. However, there has been controversy about the possible role of these changes in the pathogenesis of muscle fiber damage. In particular, there is no agreement whether a cause-and-effect relationship exists between these two groups of changes, and if so, which is the primary one. In this brief overview, we examine the validity of the various controversial observations and critically review the justification for the two major hypotheses for the primary role of inflammation versus degeneration.
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Affiliation(s)
- George Karpati
- Department of Neurology, McGill University, Montreal Neurological Institute, Montreal, Quebec, Canada.
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