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Suzuki N, Kanzaki M, Koide M, Izumi R, Fujita R, Takahashi T, Ogawa K, Yabe Y, Tsuchiya M, Suzuki M, Harada R, Ohno A, Ono H, Nakamura N, Ikeda K, Warita H, Osana S, Oikawa Y, Toyohara T, Abe T, Rui M, Ebihara S, Nagatomi R, Hagiwara Y, Aoki M. Sporadic inclusion body myositis-derived myotube culture revealed muscle cell-autonomous expression profiles. PLoS One 2024; 19:e0306021. [PMID: 39088432 PMCID: PMC11293708 DOI: 10.1371/journal.pone.0306021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2024] [Accepted: 06/10/2024] [Indexed: 08/03/2024] Open
Abstract
Sporadic inclusion body myositis (sIBM) is a muscle disease in older people and is characterized by inflammatory cell invasion into intact muscle fibers and rimmed vacuoles. The pathomechanism of sIBM is not fully elucidated yet, and controversy exists as to whether sIBM is a primary autoimmune disease or a degenerative muscle disease with secondary inflammation. Previously, we established a method of collecting CD56-positive myoblasts from human skeletal muscle biopsy samples. We hypothesized that the myoblasts derived from these patients are useful to see the cell-autonomous pathomechanism of sIBM. With these resources, myoblasts were differentiated into myotubes, and the expression profiles of cell-autonomous pathology of sIBM were analyzed. Myoblasts from three sIBM cases and six controls were differentiated into myotubes. In the RNA-sequencing analysis of these "myotube" samples, 104 differentially expressed genes (DEGs) were found to be significantly upregulated by more than twofold in sIBM, and 13 DEGs were downregulated by less than twofold. For muscle biopsy samples, a comparative analysis was conducted to determine the extent to which "biopsy" and "myotube" samples differed. Fifty-three DEGs were extracted of which 32 (60%) had opposite directions of expression change (e.g., increased in biopsy vs decreased in myotube). Apolipoprotein E (apoE) and transmembrane protein 8C (TMEM8C or MYMK) were commonly upregulated in muscle biopsies and myotubes from sIBM. ApoE and myogenin protein levels were upregulated in sIBM. Given that enrichment analysis also captured changes in muscle contraction and development, the triggering of muscle atrophy signaling and abnormal muscle differentiation via MYMK or myogenin may be involved in the pathogenesis of sIBM. The presence of DEGs in sIBM suggests that the myotubes formed from sIBM-derived myoblasts revealed the existence of muscle cell-autonomous degeneration in sIBM. The catalog of DEGs will be an important resource for future studies on the pathogenesis of sIBM focusing on primary muscle degeneration.
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Affiliation(s)
- Naoki Suzuki
- Department of Neurology, Tohoku University Graduate School of Medicine, Sendai, Japan
- Department of Rehabilitation Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Makoto Kanzaki
- Graduate School of Biomedical Engineering, Tohoku University, Sendai, Japan
| | - Masashi Koide
- Department of Orthopedic Surgery, Graduate School of Medicine, Tohoku University, Sendai, Japan
| | - Rumiko Izumi
- Department of Neurology, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Ryo Fujita
- Department of Orthopedic Surgery, Graduate School of Medicine, Tohoku University, Sendai, Japan
| | - Tadahisa Takahashi
- Department of Orthopedic Surgery, Graduate School of Medicine, Tohoku University, Sendai, Japan
| | - Kazumi Ogawa
- Department of Neurology, Tohoku University Graduate School of Medicine, Sendai, Japan
- Department of Orthopedic Surgery, Graduate School of Medicine, Tohoku University, Sendai, Japan
| | - Yutaka Yabe
- Department of Orthopedic Surgery, Graduate School of Medicine, Tohoku University, Sendai, Japan
| | | | - Masako Suzuki
- Department of Neurology, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Ryuhei Harada
- Department of Neurology, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Akiyuki Ohno
- Department of Neurology, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Hiroya Ono
- Department of Neurology, Tohoku University Graduate School of Medicine, Sendai, Japan
- Department of Neurology, National Hospital Organization Iwate Hospital, Ichinoseki, Iwate, Japan
| | - Naoko Nakamura
- Department of Neurology, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Kensuke Ikeda
- Department of Neurology, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Hitoshi Warita
- Department of Neurology, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Shion Osana
- Division of Biomedical Engineering for Health and Welfare, Graduate School of Biomedical Engineering, Tohoku University, Sendai, Japan
| | - Yoshitsugu Oikawa
- Department of Pediatrics, Tohoku University Graduate School of Medicine, Sendai, Japan
- Division of Nephrology, Endocrinology and Vascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Takafumi Toyohara
- Division of Nephrology, Endocrinology and Vascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
- Department of Medical Science, Tohoku University Graduate School of Biomedical Engineering, Sendai, Japan
| | - Takaaki Abe
- Division of Nephrology, Endocrinology and Vascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
- Department of Medical Science, Tohoku University Graduate School of Biomedical Engineering, Sendai, Japan
- Department of Clinical Biology and Hormonal Regulation, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Muliang Rui
- Department of Rehabilitation Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Satoru Ebihara
- Department of Rehabilitation Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Ryoichi Nagatomi
- Division of Biomedical Engineering for Health and Welfare, Graduate School of Biomedical Engineering, Tohoku University, Sendai, Japan
| | - Yoshihiro Hagiwara
- Department of Orthopedic Surgery, Graduate School of Medicine, Tohoku University, Sendai, Japan
| | - Masashi Aoki
- Department of Neurology, Tohoku University Graduate School of Medicine, Sendai, Japan
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Salam S, Symonds T, Doll H, Rousell S, Randall J, Lloyd-Price L, Hudgens S, Guldberg C, Herbelin L, Barohn RJ, Hanna MG, Dimachkie MM, Machado PM. Measurement properties of the Inclusion Body Myositis Functional Rating Scale. J Neurol Neurosurg Psychiatry 2024:jnnp-2024-333617. [PMID: 38960586 DOI: 10.1136/jnnp-2024-333617] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/19/2024] [Accepted: 06/12/2024] [Indexed: 07/05/2024]
Abstract
OBJECTIVES To evaluate the validity, reliability, responsiveness and meaningful change threshold of the Inclusion Body Myositis (IBM) Functional Rating Scale (FRS). METHODS Data from a large 20-month multicentre, randomised, double-blind, placebo-controlled trial in IBM were used. Convergent validity was tested using Spearman correlation with other health outcomes. Discriminant (known groups) validity was assessed using standardised effect sizes (SES). Internal consistency was tested using Cronbach's alpha. Intrarater reliability in stable patients and equivalence of face-to-face and telephone administration were tested using intraclass correlation coefficients (ICCs) and Bland-Altman plots. Responsiveness was assessed using standardised response mean (SRM). A receiver operator characteristic (ROC) curve anchor-based approach was used to determine clinically meaningful IBMFRS change. RESULTS Among the 150 patients, mean (SD) IBMFRS total score was 27.4 (4.6). Convergent validity was supported by medium to large correlations (rs modulus: 0.42-0.79) and discriminant validity by moderate to large group differences (SES=0.51-1.59). Internal consistency was adequate (overall Cronbach's alpha: 0.79). Test-retest reliability (ICCs=0.84-0.87) and reliability of telephone versus face-to-face administration (ICCs=0.93-0.95) were excellent, with Bland-Altman plots showing good agreement. Responsiveness in the worsened group defined by various external constructs was large at both 12 (SRM=-0.76 to -1.49) and 20 months (SRM=-1.12 to -1.57). In ROC curve analysis, a drop in at least two IBMFRS total score points was shown to represent a meaningful decline. CONCLUSIONS When administered by trained raters, the IBMFRS is a reliable, valid and responsive tool that can be used to evaluate the impact of IBM and its treatment on physical function, with a 2-point reduction representing meaningful decline. TRIAL REGISTRATION NUMBER NCT02753530.
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Affiliation(s)
- Sharfaraz Salam
- Department of Neuromuscular Diseases, University College London, London, UK
| | | | - Helen Doll
- Clinical Outcomes Solutions Ltd, Folkestone, UK
| | - Sam Rousell
- Clinical Outcomes Solutions Ltd, Folkestone, UK
| | | | | | | | | | - Laura Herbelin
- Department of Neurology, University of Missouri, Columbia, Missouri, USA
| | - Richard J Barohn
- Department of Neurology, University of Missouri, Columbia, Missouri, USA
| | - Michael G Hanna
- Department of Neuromuscular Diseases, University College London, London, UK
| | - Mazen M Dimachkie
- Department of Neurology, University of Kansas City Medical Center, Kansas City, Missouri, USA
| | - Pedro M Machado
- Department of Neuromuscular Diseases, University College London, London, UK
- NIHR University College London Hospitals Biomedical Research Centre, University College London Hospitals National Health Service (NHS) Trust, London, UK
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3
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Piga D, Zanotti S, Ripolone M, Napoli L, Ciscato P, Gibertini S, Maggi L, Fortunato F, Rigamonti A, Ronchi D, Comi GP, Corti S, Sciacco M. Association between ZASP/LDB3 Pro26Ser and Inclusion Body Myopathy. Int J Mol Sci 2024; 25:6547. [PMID: 38928252 PMCID: PMC11203685 DOI: 10.3390/ijms25126547] [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: 05/07/2024] [Revised: 06/04/2024] [Accepted: 06/11/2024] [Indexed: 06/28/2024] Open
Abstract
Inclusion body myositis (IBM) is a slowly progressive disorder belonging to the idiopathic inflammatory myopathies, and it represents the most common adult-onset acquired myopathy. The main clinical features include proximal or distal muscular asymmetric weakness, with major involvement of long finger flexors and knee extensors. The main histological findings are the presence of fiber infiltrations, rimmed vacuoles, and amyloid inclusions. The etiopathogenesis is a challenge because both environmental and genetic factors are implicated in muscle degeneration and a distinction has been made previously between sporadic and hereditary forms. Here, we describe an Italian patient affected with a hereditary form of IBM with onset in his mid-forties. Next-generation sequencing analysis disclosed a heterozygous mutation c.76C>T (p.Pro26Ser) in the PDZ motif of the LDB3/ZASP gene, a mutation already described in a family with a late-onset myopathy and highly heterogenous degree of skeletal muscle weakness. In the proband's muscle biopsy, the expression of ZASP, myotilin, and desmin were increased. In our family, in addition to the earlier age of onset, the clinical picture is even more peculiar given the evidence, in one of the affected family members, of complete ophthalmoplegia in the vertical gaze. These findings help extend our knowledge of the clinical and genetic background associated with inclusion body myopathic disorders.
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Affiliation(s)
- Daniela Piga
- Neurology Unit, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy
| | - Simona Zanotti
- Neuromuscular and Rare Disease Unit, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy
| | - Michela Ripolone
- Neuromuscular and Rare Disease Unit, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy
| | - Laura Napoli
- Neuromuscular and Rare Disease Unit, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy
| | - Patrizia Ciscato
- Neuromuscular and Rare Disease Unit, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy
| | - Sara Gibertini
- Neuroimmunology and Neuromuscular Diseases Unit, Fondazione IRCCS Istituto Neurologico “Carlo Besta”, 20133 Milan, Italy
| | - Lorenzo Maggi
- Neuroimmunology and Neuromuscular Diseases Unit, Fondazione IRCCS Istituto Neurologico “Carlo Besta”, 20133 Milan, Italy
| | - Francesco Fortunato
- Dino Ferrari Center, Department of Pathophysiology and Transplantation, University of Milan, 20122 Milan, Italy
| | - Andrea Rigamonti
- UOC Neurologia–Stroke Unit, Presidio “A. Manzoni”, ASST Lecco, 23900 Lecco, Italy
| | - Dario Ronchi
- Neurology Unit, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy
- Dino Ferrari Center, Department of Pathophysiology and Transplantation, University of Milan, 20122 Milan, Italy
| | - Giacomo Pietro Comi
- Neurology Unit, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy
- Dino Ferrari Center, Department of Pathophysiology and Transplantation, University of Milan, 20122 Milan, Italy
| | - Stefania Corti
- Neuromuscular and Rare Disease Unit, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy
- Dino Ferrari Center, Department of Pathophysiology and Transplantation, University of Milan, 20122 Milan, Italy
| | - Monica Sciacco
- Neurology Unit, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy
- Neuromuscular and Rare Disease Unit, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy
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Yoshida A, Li Y, Maroufy V, Kuwana M, Sazliyana Shaharir S, Makol A, Sen P, Lilleker JB, Agarwal V, Kadam E, Akawatcharangura Goo P, Day J, Milchert M, Chen YM, Dey D, Velikova T, Saha S, Edgar Gracia-Ramos A, Parodis I, Nikiphorou E, Tan AL, Nune A, Cavagna L, Toro Gutiérrez CE, Caballero-Uribe CV, Saavedra MA, Shinjo SK, Ziade N, El Kibbi L, Knitza J, Distler O, Chinoy H, Agarwal V, Aggarwal R, Gupta L. Impaired health-related quality of life in idiopathic inflammatory myopathies: a cross-sectional analysis from the COVAD-2 e-survey. Rheumatol Adv Pract 2024; 8:rkae028. [PMID: 38524696 PMCID: PMC10960935 DOI: 10.1093/rap/rkae028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2023] [Accepted: 01/11/2024] [Indexed: 03/26/2024] Open
Abstract
Objectives To investigate health-related quality of life in patients with idiopathic inflammatory myopathies (IIMs) compared with those with non-IIM autoimmune rheumatic diseases (AIRDs), non-rheumatic autoimmune diseases (nrAIDs) and without autoimmune diseases (controls) using Patient-Reported Outcome Measurement Information System (PROMIS) instrument data obtained from the second COVID-19 vaccination in autoimmune disease (COVAD-2) e-survey database. Methods Demographics, diagnosis, comorbidities, disease activity, treatments and PROMIS instrument data were analysed. Primary outcomes were PROMIS Global Physical Health (GPH) and Global Mental Health (GMH) scores. Factors affecting GPH and GMH scores in IIMs were identified using multivariable regression analysis. Results We analysed responses from 1582 IIM, 4700 non-IIM AIRD and 545 nrAID patients and 3675 controls gathered through 23 May 2022. The median GPH scores were the lowest in IIM and non-IIM AIRD patients {13 [interquartile range (IQR) 10-15] IIMs vs 13 [11-15] non-IIM AIRDs vs 15 [13-17] nrAIDs vs 17 [15-18] controls, P < 0.001}. The median GMH scores in IIM patients were also significantly lower compared with those without autoimmune diseases [13 (IQR 10-15) IIMs vs 15 (13-17) controls, P < 0.001]. Inclusion body myositis, comorbidities, active disease and glucocorticoid use were the determinants of lower GPH scores, whereas overlap myositis, interstitial lung disease, depression, active disease, lower PROMIS Physical Function 10a and higher PROMIS Fatigue 4a scores were associated with lower GMH scores in IIM patients. Conclusion Both physical and mental health are significantly impaired in IIM patients, particularly in those with comorbidities and increased fatigue, emphasizing the importance of patient-reported experiences and optimized multidisciplinary care to enhance well-being in people with IIMs.
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Affiliation(s)
- Akira Yoshida
- Department of Allergy and Rheumatology, Nippon Medical School Graduate School of Medicine, Tokyo, Japan
| | - Yuan Li
- Department of Biostatistics and Data Science, School of Public Health, University of Texas Health Science Center at Houston, Houston, TX, USA
| | - Vahed Maroufy
- Department of Biostatistics and Data Science, School of Public Health, University of Texas Health Science Center at Houston, Houston, TX, USA
| | - Masataka Kuwana
- Department of Allergy and Rheumatology, Nippon Medical School Graduate School of Medicine, Tokyo, Japan
| | - Syahrul Sazliyana Shaharir
- UKM Medical Centre, Department of Medicine, Faculty of Medicine, Universiti Kebangsaan Malaysia, Kuala Lumpur, Cheras, Malaysia
| | - Ashima Makol
- Division of Rheumatology, Mayo Clinic, Rochester, MN, USA
| | - Parikshit Sen
- Maulana Azad Medical College, New Delhi, Delhi, India
| | - James B Lilleker
- Centre for Musculoskeletal Research, Division of Musculoskeletal and Dermatological Sciences, School of Biological Sciences, Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, University of Manchester, Manchester, UK
- Manchester Centre for Clinical Neurosciences, Salford Royal NHS Foundation Trust, Salford, UK
| | - Vishwesh Agarwal
- Mahatma Gandhi Mission Medical College, Navi Mumbai, Maharashtra, India
| | - Esha Kadam
- Seth Gordhandhas Sunderdas Medical College and King Edwards Memorial Hospital, Mumbai, Maharashtra, India
| | | | - Jessica Day
- Department of Rheumatology, Royal Melbourne Hospital, Parkville, VIC, Australia
- Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia
- Department of Medical Biology, University of Melbourne, Parkville, VIC, Australia
| | - Marcin Milchert
- Department of Internal Medicine, Rheumatology, Diabetology, Geriatrics and Clinical Immunology, Pomeranian Medical University in Szczecin, Szczecin, Poland
| | - Yi-Ming Chen
- Division of Allergy, Immunology and Rheumatology, Department of Medical Research, Taichung Veterans General Hospital, Taiwan
| | - Dzifa Dey
- Department of Medicine and Therapeutics, University of Ghana Medical School, College of Health Sciences, Accra, Ghana
| | | | - Sreoshy Saha
- Mymensingh Medical College, Mymensingh, Bangladesh
| | - Abraham Edgar Gracia-Ramos
- Department of Internal Medicine, General Hospital, National Medical Center “La Raza”, Instituto Mexicano del Seguro Social, Mexico City, Mexico
| | - Ioannis Parodis
- Division of Rheumatology, Department of Medicine Solna, Karolinska Institutet and Karolinska University Hospital, Stockholm, Sweden
- Department of Rheumatology, Faculty of Medicine and Health, Örebro University, Örebro, Sweden
| | - Elena Nikiphorou
- Centre for Rheumatic Diseases, King’s College London, London, UK
- Rheumatology Department, King’s College Hospital, London, UK
| | - Ai Lyn Tan
- NIHR Leeds Biomedical Research Centre, Leeds Teaching Hospitals Trust, Leeds, UK
- Leeds Institute of Rheumatic and Musculoskeletal Medicine, University of Leeds, Leeds, UK
| | - Arvind Nune
- Southport and Ormskirk Hospital NHS Trust, Southport, UK
| | - Lorenzo Cavagna
- Rheumatology Unit, Dipartimento di Medicine Interna e Terapia Medica, Università degli studi di Pavia, Pavia, Lombardy, Italy
| | | | | | - Miguel A Saavedra
- Departamento de Reumatología Hospital de Especialidades Dr Antonio Fraga Mouret, Centro Médico Nacional La Raza, IMSS, Mexico City, Mexico
| | - Samuel Katsuyuki Shinjo
- Division of Rheumatology, Faculdade de Medicina FMUSP, Universidade de Sao Paulo, Sao Paulo, Brazil
| | - Nelly Ziade
- Rheumatology Department, Saint-Joseph University, Beirut, Lebanon
- Rheumatology Department, Hotel-Dieu de France Hospital, Beirut, Lebanon
| | - Lina El Kibbi
- Department of Rheumatology, Specialised Medical Center Hospital, Alfaisal University, Riyadh, Saudi Arabia
| | - Johannes Knitza
- Medizinische Klinik 3 – Rheumatologie und Immunologie, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Deutschland
| | - Oliver Distler
- Department of Rheumatology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Hector Chinoy
- Division of Musculoskeletal and Dermatological Sciences, Centre for Musculoskeletal Research, School of Biological Sciences, University of Manchester, Manchester, UK
- National Institute for Health Research Manchester Biomedical Research Centre, Manchester University NHS Foundation Trust, University of Manchester, Manchester, UK
- Department of Rheumatology, Salford Royal Hospital, Northern Care Alliance NHS Foundation Trust, Salford, UK
| | - Vikas Agarwal
- Department of Clinical Immunology and Rheumatology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, India
| | - Rohit Aggarwal
- Division of Rheumatology and Clinical Immunology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Latika Gupta
- Division of Musculoskeletal and Dermatological Sciences, Centre for Musculoskeletal Research, School of Biological Sciences, University of Manchester, Manchester, UK
- Department of Rheumatology, Royal Wolverhampton Hospitals NHS Trust, Wolverhampton, UK
- Department of Rheumatology, City Hospital, Sandwell and West Birmingham Hospitals NHS Trust, Birmingham, UK
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5
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Guglielmi V, Cheli M, Tonin P, Vattemi G. Sporadic Inclusion Body Myositis at the Crossroads between Muscle Degeneration, Inflammation, and Aging. Int J Mol Sci 2024; 25:2742. [PMID: 38473988 PMCID: PMC10932328 DOI: 10.3390/ijms25052742] [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: 12/27/2023] [Revised: 02/19/2024] [Accepted: 02/22/2024] [Indexed: 03/14/2024] Open
Abstract
Sporadic inclusion body myositis (sIBM) is the most common muscle disease of older people and is clinically characterized by slowly progressive asymmetrical muscle weakness, predominantly affecting the quadriceps, deep finger flexors, and foot extensors. At present, there are no enduring treatments for this relentless disease that eventually leads to severe disability and wheelchair dependency. Although sIBM is considered a rare muscle disorder, its prevalence is certainly higher as the disease is often undiagnosed or misdiagnosed. The histopathological phenotype of sIBM muscle biopsy includes muscle fiber degeneration and endomysial lymphocytic infiltrates that mainly consist of cytotoxic CD8+ T cells surrounding nonnecrotic muscle fibers expressing MHCI. Muscle fiber degeneration is characterized by vacuolization and the accumulation of congophilic misfolded multi-protein aggregates, mainly in their non-vacuolated cytoplasm. Many players have been identified in sIBM pathogenesis, including environmental factors, autoimmunity, abnormalities of protein transcription and processing, the accumulation of several toxic proteins, the impairment of autophagy and the ubiquitin-proteasome system, oxidative and nitrative stress, endoplasmic reticulum stress, myonuclear degeneration, and mitochondrial dysfunction. Aging has also been proposed as a contributor to the disease. However, the interplay between these processes and the primary event that leads to the coexistence of autoimmune and degenerative changes is still under debate. Here, we outline our current understanding of disease pathogenesis, focusing on degenerative mechanisms, and discuss the possible involvement of aging.
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Affiliation(s)
- Valeria Guglielmi
- Cellular and Molecular Biology of Cancer Program, NCI-Designated Cancer Center, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA 92037, USA;
- Immunity and Pathogenesis Program, Infectious and Inflammatory Disease Center, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA 92037, USA
| | - Marta Cheli
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, 37134 Verona, Italy; (M.C.); (P.T.)
| | - Paola Tonin
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, 37134 Verona, Italy; (M.C.); (P.T.)
| | - Gaetano Vattemi
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, 37134 Verona, Italy; (M.C.); (P.T.)
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Allen JA, Clarke AE, Harbo T. A Practical Guide to Identify Patients With Multifocal Motor Neuropathy, a Treatable Immune-Mediated Neuropathy. Mayo Clin Proc Innov Qual Outcomes 2024; 8:74-81. [PMID: 38283096 PMCID: PMC10819864 DOI: 10.1016/j.mayocpiqo.2023.12.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2024] Open
Abstract
Multifocal motor neuropathy (MMN) is a rare immune-mediated motor neuropathy characterized by asymmetric weakness that preferentially affects distal upper limb muscles. The clinical features of MMN may be difficult to differentiate from motor neuron disease. Other conditions that may be mistaken for MMN include inclusion body myositis, chronic inflammatory demyelinating polyradiculoneuropathy, hereditary neuropathy with liability to pressure palsy, focal neuropathies, and radiculopathies. A key distinguishing electrophysiologic feature of MMN is the motor nerve conduction block located at noncompressible sites. MMN is a treatable neuropathy; therefore it is important that primary care physicians are aware of the features of the disease to identify potential patients and make referrals to a neuromuscular specialist in a timely manner. This review provides an overview of the disease, highlights key differential diagnoses, and describes available treatment options for patients with MMN.
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Affiliation(s)
- Jeffrey A. Allen
- Department of Neurology, University of Minnesota, Minneapolis, MN
| | | | - Thomas Harbo
- Department of Neurology, Aarhus University Hospital, Aarhus, DK
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Cantó-Santos J, Valls-Roca L, Tobías E, Oliva C, García-García FJ, Guitart-Mampel M, Andújar-Sánchez F, Esteve-Codina A, Martín-Mur B, Padrosa J, Aránega R, Moreno-Lozano PJ, Milisenda JC, Artuch R, Grau-Junyent JM, Garrabou G. Integrated Multi-Omics Analysis for Inferring Molecular Players in Inclusion Body Myositis. Antioxidants (Basel) 2023; 12:1639. [PMID: 37627634 PMCID: PMC10452026 DOI: 10.3390/antiox12081639] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2023] [Revised: 08/11/2023] [Accepted: 08/14/2023] [Indexed: 08/27/2023] Open
Abstract
Inclusion body myositis (IBM) is an acquired inflammatory myopathy affecting proximal and distal muscles that leads to weakness in patients over 50. It is diagnosed based on clinical and histological findings in muscle related to inflammation, degeneration, and mitochondria. In relation to IBM, a shortage of validated disease models and a lack of biomarkers and effective treatments constitute an unmet medical need. To overcome these hurdles, we performed an omics analysis of multiple samples from IBM patients (saliva, fibroblasts, urine, plasma, and muscle) to gain insight into the pathophysiology of IBM. Degeneration was evident due to the presence of amyloid β peptide 1-42 (Aβ1-42) in the saliva of the analyzed IBM patients. The presence of metabolic disarrangements in IBM was indicated by an imbalanced organic acid profile in fibroblasts and urine. Specifically, abnormal levels of L-pyroglutamic and orotic acid were supported by the abnormal expression of related metabolites in plasma and urine (glutathione and pyrimidines) and the aberrant expression of upstream gene regulators (L2HGDH, IDH2, OPLAH, and ASL) in muscle. Combined levels of L-pyroglutamic and orotic acid displayed an outstanding biomarker signature in urine with 100% sensitivity and specificity. The confirmation of systemic metabolic disarrangements in IBM and the identification of novel biomarkers reported herein unveil novel insights that require validation in larger cohorts.
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Affiliation(s)
- Judith Cantó-Santos
- Inherited Metabolic Disorders and Muscular Diseases Research Group, Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS) and Faculty of Medicine and Health Sciences, University of Barcelona, 08036 Barcelona, Spain; (J.C.-S.); (L.V.-R.); (E.T.); (F.J.G.-G.); (M.G.-M.); (F.A.-S.); (J.P.); (R.A.); (P.J.M.-L.)
- Department of Internal Medicine, Hospital Clinic of Barcelona, 08036 Barcelona, Spain
- CIBERER—Spanish Biomedical Research Centre in Rare Diseases, 28029 Madrid, Spain
| | - Laura Valls-Roca
- Inherited Metabolic Disorders and Muscular Diseases Research Group, Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS) and Faculty of Medicine and Health Sciences, University of Barcelona, 08036 Barcelona, Spain; (J.C.-S.); (L.V.-R.); (E.T.); (F.J.G.-G.); (M.G.-M.); (F.A.-S.); (J.P.); (R.A.); (P.J.M.-L.)
- Department of Internal Medicine, Hospital Clinic of Barcelona, 08036 Barcelona, Spain
- CIBERER—Spanish Biomedical Research Centre in Rare Diseases, 28029 Madrid, Spain
| | - Ester Tobías
- Inherited Metabolic Disorders and Muscular Diseases Research Group, Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS) and Faculty of Medicine and Health Sciences, University of Barcelona, 08036 Barcelona, Spain; (J.C.-S.); (L.V.-R.); (E.T.); (F.J.G.-G.); (M.G.-M.); (F.A.-S.); (J.P.); (R.A.); (P.J.M.-L.)
- Department of Internal Medicine, Hospital Clinic of Barcelona, 08036 Barcelona, Spain
- CIBERER—Spanish Biomedical Research Centre in Rare Diseases, 28029 Madrid, Spain
| | - Clara Oliva
- Department of Clinical Biochemistry, Institut de Recerca Sant Joan de Déu, Esplugues de Llobregat, 08950 Barcelona, Spain; (C.O.); (R.A.)
| | - Francesc Josep García-García
- Inherited Metabolic Disorders and Muscular Diseases Research Group, Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS) and Faculty of Medicine and Health Sciences, University of Barcelona, 08036 Barcelona, Spain; (J.C.-S.); (L.V.-R.); (E.T.); (F.J.G.-G.); (M.G.-M.); (F.A.-S.); (J.P.); (R.A.); (P.J.M.-L.)
- Department of Internal Medicine, Hospital Clinic of Barcelona, 08036 Barcelona, Spain
- CIBERER—Spanish Biomedical Research Centre in Rare Diseases, 28029 Madrid, Spain
| | - Mariona Guitart-Mampel
- Inherited Metabolic Disorders and Muscular Diseases Research Group, Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS) and Faculty of Medicine and Health Sciences, University of Barcelona, 08036 Barcelona, Spain; (J.C.-S.); (L.V.-R.); (E.T.); (F.J.G.-G.); (M.G.-M.); (F.A.-S.); (J.P.); (R.A.); (P.J.M.-L.)
- Department of Internal Medicine, Hospital Clinic of Barcelona, 08036 Barcelona, Spain
- CIBERER—Spanish Biomedical Research Centre in Rare Diseases, 28029 Madrid, Spain
| | - Félix Andújar-Sánchez
- Inherited Metabolic Disorders and Muscular Diseases Research Group, Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS) and Faculty of Medicine and Health Sciences, University of Barcelona, 08036 Barcelona, Spain; (J.C.-S.); (L.V.-R.); (E.T.); (F.J.G.-G.); (M.G.-M.); (F.A.-S.); (J.P.); (R.A.); (P.J.M.-L.)
- Department of Internal Medicine, Hospital Clinic of Barcelona, 08036 Barcelona, Spain
- CIBERER—Spanish Biomedical Research Centre in Rare Diseases, 28029 Madrid, Spain
| | - Anna Esteve-Codina
- CNAG-CRG, Centre for Genomic Regulation, Barcelona Institute of Science and Technology, 08028 Barcelona, Spain; (A.E.-C.); (B.M.-M.)
- Department of Medicine and Health Sciences, Universitat Pompeu Fabra (UPF), 08003 Barcelona, Spain
| | - Beatriz Martín-Mur
- CNAG-CRG, Centre for Genomic Regulation, Barcelona Institute of Science and Technology, 08028 Barcelona, Spain; (A.E.-C.); (B.M.-M.)
| | - Joan Padrosa
- Inherited Metabolic Disorders and Muscular Diseases Research Group, Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS) and Faculty of Medicine and Health Sciences, University of Barcelona, 08036 Barcelona, Spain; (J.C.-S.); (L.V.-R.); (E.T.); (F.J.G.-G.); (M.G.-M.); (F.A.-S.); (J.P.); (R.A.); (P.J.M.-L.)
- Department of Internal Medicine, Hospital Clinic of Barcelona, 08036 Barcelona, Spain
- CIBERER—Spanish Biomedical Research Centre in Rare Diseases, 28029 Madrid, Spain
| | - Raquel Aránega
- Inherited Metabolic Disorders and Muscular Diseases Research Group, Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS) and Faculty of Medicine and Health Sciences, University of Barcelona, 08036 Barcelona, Spain; (J.C.-S.); (L.V.-R.); (E.T.); (F.J.G.-G.); (M.G.-M.); (F.A.-S.); (J.P.); (R.A.); (P.J.M.-L.)
- Department of Internal Medicine, Hospital Clinic of Barcelona, 08036 Barcelona, Spain
- CIBERER—Spanish Biomedical Research Centre in Rare Diseases, 28029 Madrid, Spain
| | - Pedro J. Moreno-Lozano
- Inherited Metabolic Disorders and Muscular Diseases Research Group, Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS) and Faculty of Medicine and Health Sciences, University of Barcelona, 08036 Barcelona, Spain; (J.C.-S.); (L.V.-R.); (E.T.); (F.J.G.-G.); (M.G.-M.); (F.A.-S.); (J.P.); (R.A.); (P.J.M.-L.)
- Department of Internal Medicine, Hospital Clinic of Barcelona, 08036 Barcelona, Spain
- CIBERER—Spanish Biomedical Research Centre in Rare Diseases, 28029 Madrid, Spain
| | - José César Milisenda
- Inherited Metabolic Disorders and Muscular Diseases Research Group, Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS) and Faculty of Medicine and Health Sciences, University of Barcelona, 08036 Barcelona, Spain; (J.C.-S.); (L.V.-R.); (E.T.); (F.J.G.-G.); (M.G.-M.); (F.A.-S.); (J.P.); (R.A.); (P.J.M.-L.)
- Department of Internal Medicine, Hospital Clinic of Barcelona, 08036 Barcelona, Spain
- CIBERER—Spanish Biomedical Research Centre in Rare Diseases, 28029 Madrid, Spain
| | - Rafael Artuch
- Department of Clinical Biochemistry, Institut de Recerca Sant Joan de Déu, Esplugues de Llobregat, 08950 Barcelona, Spain; (C.O.); (R.A.)
| | - Josep M. Grau-Junyent
- Inherited Metabolic Disorders and Muscular Diseases Research Group, Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS) and Faculty of Medicine and Health Sciences, University of Barcelona, 08036 Barcelona, Spain; (J.C.-S.); (L.V.-R.); (E.T.); (F.J.G.-G.); (M.G.-M.); (F.A.-S.); (J.P.); (R.A.); (P.J.M.-L.)
- Department of Internal Medicine, Hospital Clinic of Barcelona, 08036 Barcelona, Spain
- CIBERER—Spanish Biomedical Research Centre in Rare Diseases, 28029 Madrid, Spain
| | - Glòria Garrabou
- Inherited Metabolic Disorders and Muscular Diseases Research Group, Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS) and Faculty of Medicine and Health Sciences, University of Barcelona, 08036 Barcelona, Spain; (J.C.-S.); (L.V.-R.); (E.T.); (F.J.G.-G.); (M.G.-M.); (F.A.-S.); (J.P.); (R.A.); (P.J.M.-L.)
- Department of Internal Medicine, Hospital Clinic of Barcelona, 08036 Barcelona, Spain
- CIBERER—Spanish Biomedical Research Centre in Rare Diseases, 28029 Madrid, Spain
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