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Koumas C, Michelassi F. Immune-Mediated Necrotizing Myopathies: Current Landscape. Curr Neurol Neurosci Rep 2024; 24:141-150. [PMID: 38589696 DOI: 10.1007/s11910-024-01337-y] [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] [Accepted: 03/11/2024] [Indexed: 04/10/2024]
Abstract
PURPOSE OF REVIEW Immune-mediated necrotizing myopathy (IMNM), characterized by acute or subacute onset, severe weakness, and elevated creatine kinase levels, poses diagnostic and therapeutic challenges. This article provides a succinct overview of IMNM, including clinical features, diagnostic strategies, and treatment approaches. RECENT FINDINGS Recent insights highlight the different clinical presentations and therapeutic options of IMNM stratified by autoantibody positivity and type. Additionally, recent findings call into question the reported link between statin use and IMNM. This review synthesizes current knowledge on IMNM, emphasizing its distinct clinical features and challenging management. The evolving understanding of IMNM underscores the need for a comprehensive diagnostic approach that utilizes a growing range of modalities. Early and aggressive immunomodulatory therapy remains pivotal. Ongoing research aims to refine diagnostic tools and therapeutic interventions for this challenging muscle disorder, underscoring the importance of advancing our understanding to enhance patient outcomes.
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Affiliation(s)
- Christoforos Koumas
- Department of Neurology, Columbia University Medical Center, New York, NY, USA.
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2
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Greenberg SA, Pinkus JL, Kong SW, Baecher-Allan C, Amato AA, Dorfman DM. Highly differentiated cytotoxic T cells in inclusion body myositis. Brain 2019; 142:2590-2604. [DOI: 10.1093/brain/awz207] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2019] [Revised: 04/21/2019] [Accepted: 05/16/2019] [Indexed: 01/12/2023] Open
Abstract
Abstract
Inclusion body myositis is a late onset treatment-refractory autoimmune disease of skeletal muscle associated with a blood autoantibody (anti-cN1A), an HLA autoimmune haplotype, and muscle pathology characterized by cytotoxic CD8+ T cell destruction of myofibres. Here, we report on translational studies of inclusion body myositis patient muscle compared with a diverse set of other muscle disease samples. Using available microarray data on 411 muscle samples from patients with inclusion body myositis (n = 40), other muscle diseases (n = 265), and without neuromuscular disease (normal, n = 106), we identified a signature of T-cell cytotoxicity in inclusion body myositis muscle coupled with a signature of highly differentiated CD8 T-cell effector memory and terminally differentiated effector cells. Further, we examined killer cell lectin-like receptor G1 (KLRG1) as a marker of this population of cells, demonstrated the correlation of KLRG1 gene expression with lymphocyte cytotoxicity across 28 870 human tissue samples, and identified the presence of KLRG1 on pathogenic inclusion body myositis muscle invading T cells and an increase in KLRG1 expressing T cells in inclusion body myositis blood. We examined inclusion body myositis muscle T-cell proliferation by Ki67 immunohistochemistry demonstrating that diseased muscle-invading T cells are minimally or non-proliferative, in accordance with known properties of highly differentiated or terminally differentiated T cells. We found low expression of KLRG1 on infection-protective human lymphoid tissue central memory T cells and autoimmune-protective human blood regulatory T cells. Targeting highly differentiated cytotoxic T cells could be a favourable approach to treatment of inclusion body myositis.
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Affiliation(s)
- Steven A Greenberg
- Brigham and Women’s Hospital Department of Neurology, Division of Neuromuscular Disease, and Harvard Medical School, Boston, MA, USA
- Computational Health Informatics Program, Boston Children’s Hospital, Boston, MA and Harvard Medical School, Boston, MA, USA
| | - Jack L Pinkus
- Brigham and Women’s Hospital Department of Neurology, Division of Neuromuscular Disease, and Harvard Medical School, Boston, MA, USA
| | - Sek Won Kong
- Computational Health Informatics Program, Boston Children’s Hospital, Boston, MA and Harvard Medical School, Boston, MA, USA
| | - Clare Baecher-Allan
- Brigham and Women’s Hospital Department of Neurology, Division of Neuromuscular Disease, and Harvard Medical School, Boston, MA, USA
- Ann Romney Center for Neurologic Disease, Brigham and Women's Hospital, Boston, MA, USA
| | - Anthony A Amato
- Brigham and Women’s Hospital Department of Neurology, Division of Neuromuscular Disease, and Harvard Medical School, Boston, MA, USA
| | - David M Dorfman
- Brigham and Women’s Hospital Department of Neurology, Division of Neuromuscular Disease, and Harvard Medical School, Boston, MA, USA
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Zhang X, Yang X, Ji L, Zhang Z. Validation of 2017 classification criteria for adult and juvenile idiopathic inflammatory myopathies proposed by EULAR/ACR in Chinese patients. Int J Rheum Dis 2019; 22:1278-1282. [PMID: 31124267 DOI: 10.1111/1756-185x.13605] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2018] [Revised: 04/15/2019] [Accepted: 04/30/2019] [Indexed: 12/01/2022]
Abstract
OBJECTIVES To evaluate the ability of 2017 European League Against Rheumatism/American College of Rheumatology (EULAR/ACR) classification criteria for adult and juvenile idiopathic inflammatory myopathies (IIM) to classify IIM in comparison with the 1975 Bohan and Peter criteria in Chinese patients. METHODS Two hundred and twenty-one inpatients with suspected IIM (including 40 children) were retrospectively included in this study. The performance of the 2017 EULAR/ACR criteria was evaluated by sensitivity, specificity, positive predictive value, negative predictive value and classification rate, in comparison to the 1975 criteria, with clinical diagnosis as the gold standard. RESULTS The sensitivity, specificity, positive predictive value, negative predictive value of the 2017 EULAR/ACR criteria in IIM classification were 92.7%, 87.0%, 90.1% and 90.4%, respectively, in contrast to the 1975 Bohan and Peter criteria of 84.0%, 52.2%, 61.8%, and 77.9%. The classification rate of the 2017 criteria was also much better than that of the 1975 criteria (90.2% vs 67.4%). The performance of the new criteria in general, as well as the new criteria with muscle biopsy was better. Most IIM patients were correctly further sub-classified by the classification tree. The positive rate of myogenic lesions in electromyography, muscular inflammatory edema in magnetic resonance imaging and specific antibodies of myositis were significantly higher in the IIM group than those in the control group (P < 0.001, all). CONCLUSIONS The 2017 EULAR/ACR criteria exhibited high sensitivity, specificity, classification rate in the Chinese IIM patients, which was superior to the 1975 criteria. The new criteria showed potential as clinical classification criteria in the future.
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Affiliation(s)
- Xiaohui Zhang
- Department of Rheumatology and Clinical Immunology, Peking University First Hospital, Beijing, China
| | - Xinlei Yang
- Department of Rheumatology and Clinical Immunology, Peking University First Hospital, Beijing, China
| | - Lanlan Ji
- Department of Rheumatology and Clinical Immunology, Peking University First Hospital, Beijing, China
| | - Zhuoli Zhang
- Department of Rheumatology and Clinical Immunology, Peking University First Hospital, Beijing, China
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Zhao YW, Liu XJ, Zhang W, Wang ZX, Yuan Y. Muscle Magnetic Resonance Imaging for the Differentiation of Multiple Acyl-CoA Dehydrogenase Deficiency and Immune-mediated Necrotizing Myopathy. Chin Med J (Engl) 2018; 131:144-150. [PMID: 29336361 PMCID: PMC5776843 DOI: 10.4103/0366-6999.222323] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Background: Clinically, it is difficult to differentiate multiple acyl-CoA dehydrogenase deficiency (MADD) from immune-mediated necrotizing myopathy (IMNM) because they display similar symptoms. This study aimed to determine whether muscle magnetic resonance imaging (MRI) could be used for differential diagnosis between MADD and IMNM. Methods: The study evaluated 25 MADD patients, confirmed by muscle biopsy and ETFDH gene testing, and 30 IMNM patients, confirmed by muscle biopsy. Muscles were assessed for edema and fatty replacement using thigh MRI (tMRI). Degrees and distribution patterns of fatty infiltration and edema in gluteus maximus and thigh muscles were compared. Results: Total fatty infiltration and edema scores (median, [Q1, Q3]) were 4.00 (1.00, 15.00) and 0 (0, 4.00) in MADD and 14.50 (8.00, 20.75) and 22.00 (16.75, 32.00) in IMNM, respectively, which were significantly more severe in IMNM than that in MADD (P = 0.000 and P = 0.004, respectively). Edema scores for gluteus maximus, long head of biceps femoris, and semimembranosus were significantly higher in IMNM than in MADD (all P = 0.000). Fatty infiltration scores for anterior and medial compartments were significantly more severe in IMNM than that in MADD (all P = 0.000). Conclusion: Different patterns of muscle involvement on tMRI can contribute to differential diagnosis between MADD and IMNM when clinical suspicions alone are insufficient, thereby reducing the need for muscle biopsy.
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Affiliation(s)
- Ya-Wen Zhao
- Department of Neurology, Peking University First Hospital, Beijing 100034, China
| | - Xiu-Juan Liu
- Department of Neurology, Peking University First Hospital, Beijing 100034, China
| | - Wei Zhang
- Department of Neurology, Peking University First Hospital, Beijing 100034, China
| | - Zhao-Xia Wang
- Department of Neurology, Peking University First Hospital, Beijing 100034, China
| | - Yun Yuan
- Department of Neurology, Peking University First Hospital, Beijing 100034, China
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Abstract
PURPOSE OF REVIEW Idiopathic inflammatory myopathy (IIM) classification criteria have been a subject of debate for many decades. Despite several limitations, the Bohan and Peter criteria are still widely used. The aim of this review is to discuss the evolution of IIM classification criteria. RECENT FINDINGS New IIM classification criteria are periodically proposed. The discovery of myositis-specific and myositis-associated autoantibodies led to the development of clinico-serological criteria, while in-depth description of IIM morphological features improved histopathology-based criteria. The long-awaited European League Against Rheumatism and American College of Rheumatology (EULAR/ACR) IIM classification criteria were recently published. The Bohan and Peter criteria are outdated and validated classification criteria are necessary to improve research in IIM. The new EULAR/ACR IIM classification criteria are thus a definite improvement and an important step forward in the field.
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Affiliation(s)
- Valérie Leclair
- Rheumatology Unit, Department of Medicine, Solna, Karolinska Institutet, Rheumatology Unit, Karolinska University Hospital, SE-171 76, Stockholm, Sweden
| | - Ingrid E Lundberg
- Rheumatology Unit, Department of Medicine, Solna, Karolinska Institutet and Karolinska University Hospital, Rheumatology Unit, Karolinska University Hospital, SE-171 76, Stockholm, Sweden.
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6
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Lundberg IE, Tjärnlund A, Bottai M, Werth VP, Pilkington C, Visser MD, Alfredsson L, Amato AA, Barohn RJ, Liang MH, Singh JA, Aggarwal R, Arnardottir S, Chinoy H, Cooper RG, Dankó K, Dimachkie MM, Feldman BM, Torre IGDL, Gordon P, Hayashi T, Katz JD, Kohsaka H, Lachenbruch PA, Lang BA, Li Y, Oddis CV, Olesinska M, Reed AM, Rutkowska-Sak L, Sanner H, Selva-O'Callaghan A, Song YW, Vencovsky J, Ytterberg SR, Miller FW, Rider LG. 2017 European League Against Rheumatism/American College of Rheumatology classification criteria for adult and juvenile idiopathic inflammatory myopathies and their major subgroups. Ann Rheum Dis 2017; 76:1955-1964. [PMID: 29079590 DOI: 10.1136/annrheumdis-2017-211468] [Citation(s) in RCA: 652] [Impact Index Per Article: 93.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2017] [Revised: 06/23/2017] [Accepted: 07/26/2017] [Indexed: 11/03/2022]
Abstract
OBJECTIVE To develop and validate new classification criteria for adult and juvenile idiopathic inflammatory myopathies (IIM) and their major subgroups. METHODS Candidate variables were assembled from published criteria and expert opinion using consensus methodology. Data were collected from 47 rheumatology, dermatology, neurology and paediatric clinics worldwide. Several statistical methods were used to derive the classification criteria. RESULTS Based on data from 976 IIM patients (74% adults; 26% children) and 624 non-IIM patients with mimicking conditions (82% adults; 18% children), new criteria were derived. Each item is assigned a weighted score. The total score corresponds to a probability of having IIM. Subclassification is performed using a classification tree. A probability cut-off of 55%, corresponding to a score of 5.5 (6.7 with muscle biopsy) 'probable IIM', had best sensitivity/specificity (87%/82% without biopsies, 93%/88% with biopsies) and is recommended as a minimum to classify a patient as having IIM. A probability of ≥90%, corresponding to a score of ≥7.5 (≥8.7 with muscle biopsy), corresponds to 'definite IIM'. A probability of <50%, corresponding to a score of <5.3 (<6.5 with muscle biopsy), rules out IIM, leaving a probability of ≥50 to <55% as 'possible IIM'. CONCLUSIONS The European League Against Rheumatism/American College of Rheumatology (EULAR/ACR) classification criteria for IIM have been endorsed by international rheumatology, dermatology, neurology and paediatric groups. They employ easily accessible and operationally defined elements, and have been partially validated. They allow classification of 'definite', 'probable' and 'possible' IIM, in addition to the major subgroups of IIM, including juvenile IIM. They generally perform better than existing criteria.
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Affiliation(s)
- Ingrid E Lundberg
- Rheumatology Unit, Department of Medicine, Karolinska University Hospital, Karolinska Institutet, Stockholm, Sweden
| | - Anna Tjärnlund
- Rheumatology Unit, Department of Medicine, Karolinska University Hospital, Karolinska Institutet, Stockholm, Sweden
| | - Matteo Bottai
- Institute for Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
| | - Victoria P Werth
- Department of Dermatology, Philadelphia VAMC and Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Clarissa Pilkington
- Department of Rheumatology, Great Ormond Street Hospital for Children NHS Trust, London, UK
| | - Marianne de Visser
- Department of Neurology, Academic Medical Centre, Amsterdam, The Netherlands
| | - Lars Alfredsson
- Institute for Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
| | - Anthony A Amato
- Department of Neurology, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - Richard J Barohn
- Department of Neurology, University of Kansas Medical Center, Kansas City, Kansas, USA
| | - Matthew H Liang
- Division of Rheumatology, Immunology and Allergy, Brigham and Women's Hospital, and Section of Rheumatology, Boston VA Healthcare, Boston, Massachusetts, USA
| | - Jasvinder A Singh
- Mayo Clinic College of Medicine, Rochester, Minnesota, USA.,University of Alabama and Birmingham VA Medical Center, Birmingham, USA
| | - Rohit Aggarwal
- Division of Rheumatology and Clinical Rheumatology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | | | - Hector Chinoy
- National Institute of Health Research Manchester Musculoskeletal Biomedical Research Unit, Central Manchester University Hospitals NHS Foundation Trust, University of Manchester, Manchester, UK
| | - Robert G Cooper
- MRC/ARUK Institute of Ageing and Chronic Disease, Faculty of Health & Life Sciences, University of Liverpool, Liverpool, UK
| | - Katalin Dankó
- Division of Immunology, 3rd Department of Internal Medicine, Medical and Health Science Center, University of Debrecen, Debrecen, Hungary
| | - Mazen M Dimachkie
- Department of Neurology, University of Kansas Medical Center, Kansas City, Kansas, USA
| | - Brian M Feldman
- Division of Rheumatology, Department of Pediatrics, University of Toronto and The Hospital for Sick Children, Toronto, Canada
| | - Ignacio Garcia-De La Torre
- Department of Immunology and Rheumatology, Hospital General de Occidente, Secretaría de Salud, and University of Guadalajara, Guadalajara, Jalisco, Mexico
| | - Patrick Gordon
- Department of Rheumatology, King's College Hospital NHS Foundation Trust, London, UK
| | - Taichi Hayashi
- Clinical Immunology, Doctoral Program in Clinical Sciences, Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tsukuba, Japan
| | - James D Katz
- National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, US Department of Health and Human Services, Bethesda, Maryland, USA
| | - Hitoshi Kohsaka
- Department of Rheumatology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Peter A Lachenbruch
- Department of Public Health, Oregon State University, Corvallis, Oregon, USA
| | - Bianca A Lang
- Division of Rheumatology, Department of Pediatrics, IWK Health Centre and Dalhousie University, Halifax, Canada
| | - Yuhui Li
- Department of Rheumatology and Immunology, People's Hospital of Beijing University, Beijing, China
| | - Chester V Oddis
- Division of Rheumatology and Clinical Rheumatology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Marzena Olesinska
- Connective Tissue Diseases Department, National Institute of Geriatrics, Rheumatology and Rehabilitation, Warsaw, Poland
| | - Ann M Reed
- Department of Pediatrics, Duke University, Durham, North Carolina, USA
| | - Lidia Rutkowska-Sak
- Paediatric Clinic of Rheumatology, Institute of Rheumatology, Warsaw, Poland
| | - Helga Sanner
- Section of Rheumatology, Oslo University Hospital-Rikshospitalet, Oslo, Norway
| | | | - Yeong-Wook Song
- Department of Internal Medicine, Medical Research Center, Clinical Research Institute, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Jiri Vencovsky
- Department of Rheumatology, Institute of Rheumatology, 1st Faculty of Medicine, Charles University, Prague, Czech Republic
| | - Steven R Ytterberg
- Division of Rheumatology, Mayo Clinic College of Medicine, Rochester, New York, USA
| | - Frederick W Miller
- US Department of Health and Human Services, Environmental Autoimmunity Group, Clinical Research Branch, National Institute of Environmental Health Sciences, National Institutes of Health, Bethesda, Maryland, USA
| | - Lisa G Rider
- US Department of Health and Human Services, Environmental Autoimmunity Group, Clinical Research Branch, National Institute of Environmental Health Sciences, National Institutes of Health, Bethesda, Maryland, USA
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7
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Lundberg IE, Tjärnlund A, Bottai M, Werth VP, Pilkington C, de Visser M, Alfredsson L, Amato AA, Barohn RJ, Liang MH, Singh JA, Aggarwal R, Arnardottir S, Chinoy H, Cooper RG, Dankó K, Dimachkie MM, Feldman BM, Garcia-De La Torre I, Gordon P, Hayashi T, Katz JD, Kohsaka H, Lachenbruch PA, Lang BA, Li Y, Oddis CV, Olesinska M, Reed AM, Rutkowska-Sak L, Sanner H, Selva-O'Callaghan A, Song YW, Vencovsky J, Ytterberg SR, Miller FW, Rider LG. 2017 European League Against Rheumatism/American College of Rheumatology Classification Criteria for Adult and Juvenile Idiopathic Inflammatory Myopathies and Their Major Subgroups. Arthritis Rheumatol 2017; 69:2271-2282. [PMID: 29106061 DOI: 10.1002/art.40320] [Citation(s) in RCA: 343] [Impact Index Per Article: 49.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2017] [Accepted: 07/26/2017] [Indexed: 12/20/2022]
Abstract
OBJECTIVE To develop and validate new classification criteria for adult and juvenile idiopathic inflammatory myopathies (IIM) and their major subgroups. METHODS Candidate variables were assembled from published criteria and expert opinion using consensus methodology. Data were collected from 47 rheumatology, dermatology, neurology, and pediatric clinics worldwide. Several statistical methods were utilized to derive the classification criteria. RESULTS Based on data from 976 IIM patients (74% adults; 26% children) and 624 non-IIM patients with mimicking conditions (82% adults; 18% children), new criteria were derived. Each item is assigned a weighted score. The total score corresponds to a probability of having IIM. Subclassification is performed using a classification tree. A probability cutoff of 55%, corresponding to a score of 5.5 (6.7 with muscle biopsy) "probable IIM," had best sensitivity/specificity (87%/82% without biopsies, 93%/88% with biopsies) and is recommended as a minimum to classify a patient as having IIM. A probability of ≥90%, corresponding to a score of ≥7.5 (≥8.7 with muscle biopsy), corresponds to "definite IIM." A probability of <50%, corresponding to a score of <5.3 (<6.5 with muscle biopsy), rules out IIM, leaving a probability of ≥50-<55% as "possible IIM." CONCLUSION The European League Against Rheumatism/American College of Rheumatology (EULAR/ACR) classification criteria for IIM have been endorsed by international rheumatology, dermatology, neurology, and pediatric groups. They employ easily accessible and operationally defined elements, and have been partially validated. They allow classification of "definite," "probable," and "possible" IIM, in addition to the major subgroups of IIM, including juvenile IIM. They generally perform better than existing criteria.
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Affiliation(s)
- Ingrid E Lundberg
- Karolinska University Hospital and Karolinska Institutet, Stockholm, Sweden
| | - Anna Tjärnlund
- Karolinska University Hospital and Karolinska Institutet, Stockholm, Sweden
| | | | - Victoria P Werth
- Philadelphia VA Medical Center and Hospital of the University of Pennsylvania, Philadelphia
| | | | | | | | - Anthony A Amato
- Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
| | | | - Matthew H Liang
- Brigham and Women's Hospital and Boston VA Healthcare, Boston, Massachusetts
| | - Jasvinder A Singh
- Mayo Clinic College of Medicine, Rochester, Minnesota, and University of Alabama and Birmingham VA Medical Center, Birmingham, Alabama
| | - Rohit Aggarwal
- University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania
| | | | - Hector Chinoy
- Central Manchester University Hospitals NHS Foundation Trust, University of Manchester, Manchester, UK
| | | | | | | | - Brian M Feldman
- University of Toronto and The Hospital for Sick Children, Toronto, Ontario, Canada
| | | | - Patrick Gordon
- King's College Hospital NHS Foundation Trust, London, UK
| | | | - James D Katz
- National Institute of Arthritis and Musculoskeletal and Skin Diseases, NIH, Bethesda, Maryland
| | | | | | - Bianca A Lang
- IWK Health Centre and Dalhousie University, Halifax, Nova Scotia, Canada
| | - Yuhui Li
- People's Hospital of Beijing University, Beijing, China
| | - Chester V Oddis
- University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania
| | - Marzena Olesinska
- National Institute of Geriatrics, Rheumatology and Rehabilitation, Warsaw, Poland
| | | | | | - Helga Sanner
- Oslo University Hospital-Rikshospitalet, Oslo, Norway
| | | | - Yeong-Wook Song
- Seoul National University College of Medicine, Seoul, Republic of Korea
| | | | | | - Frederick W Miller
- National Institute of Environmental Health Sciences, NIH, Bethesda, Maryland
| | - Lisa G Rider
- National Institute of Environmental Health Sciences, NIH, Bethesda, Maryland
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Keller CW, Schmidt J, Lünemann JD. Immune and myodegenerative pathomechanisms in inclusion body myositis. Ann Clin Transl Neurol 2017; 4:422-445. [PMID: 28589170 PMCID: PMC5454400 DOI: 10.1002/acn3.419] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2017] [Revised: 04/09/2017] [Accepted: 04/10/2017] [Indexed: 12/17/2022] Open
Abstract
Inclusion Body Myositis (IBM) is a relatively common acquired inflammatory myopathy in patients above 50 years of age. Pathological hallmarks of IBM are intramyofiber protein inclusions and endomysial inflammation, indicating that both myodegenerative and inflammatory mechanisms contribute to its pathogenesis. Impaired protein degradation by the autophagic machinery, which regulates innate and adaptive immune responses, in skeletal muscle fibers has recently been identified as a potential key pathomechanism in IBM. Immunotherapies, which are successfully used for treating other inflammatory myopathies lack efficacy in IBM and so far no effective treatment is available. Thus, a better understanding of the mechanistic pathways underlying progressive muscle weakness and atrophy in IBM is crucial in identifying novel promising targets for therapeutic intervention. Here, we discuss recent insights into the pathomechanistic network of mutually dependent inflammatory and degenerative events during IBM.
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Affiliation(s)
- Christian W. Keller
- Institute of Experimental ImmunologyLaboratory of NeuroinflammationUniversity of ZürichZürichSwitzerland
| | - Jens Schmidt
- Department of NeurologyUniversity Medical Center GöttingenGöttingenGermany
| | - Jan D. Lünemann
- Institute of Experimental ImmunologyLaboratory of NeuroinflammationUniversity of ZürichZürichSwitzerland
- Department of NeurologyUniversity Hospital ZürichZürichSwitzerland
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9
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Findlay AR, Goyal NA, Mozaffar T. An overview of polymyositis and dermatomyositis. Muscle Nerve 2015; 51:638-56. [PMID: 25641317 DOI: 10.1002/mus.24566] [Citation(s) in RCA: 135] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/02/2015] [Indexed: 12/23/2022]
Abstract
Polymyositis and dermatomyositis are inflammatory myopathies that differ in their clinical features, histopathology, response to treatment, and prognosis. Although their clinical pictures differ, they both present with symmetrical, proximal muscle weakness. Treatment relies mainly upon empirical use of corticosteroids and immunosuppressive agents. A deeper understanding of the molecular pathways that drive pathogenesis, careful phenotyping, and accurate disease classification will aid clinical research and development of more efficacious treatments. In this review we address the current knowledge of the epidemiology, clinical characteristics, diagnostic evaluation, classification, pathogenesis, treatment, and prognosis of polymyositis and dermatomyositis.
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Affiliation(s)
- Andrew R Findlay
- Department of Neurology, University of California, Irvine UC Irvine, MDA ALS and Neuromuscular Center, 200 South Manchester Avenue, Suite 110, Orange, California, 92868, USA
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10
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Dermatomyositis, polymyositis and immune-mediated necrotising myopathies. Biochim Biophys Acta Mol Basis Dis 2015; 1852:622-32. [DOI: 10.1016/j.bbadis.2014.05.034] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2014] [Revised: 05/18/2014] [Accepted: 05/20/2014] [Indexed: 12/11/2022]
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11
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van de Vlekkert J, Hoogendijk JE, de Visser M. Myositis with endomysial cell invasion indicates inclusion body myositis even if other criteria are not fulfilled. Neuromuscul Disord 2015; 25:451-6. [PMID: 25817837 DOI: 10.1016/j.nmd.2015.02.014] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2014] [Revised: 02/22/2015] [Accepted: 02/28/2015] [Indexed: 10/23/2022]
Abstract
The objective of this study was to investigate if patients with endomysial mononuclear cell infiltrates invading non-necrotic fibers have a disease course consistent with inclusion body myositis (IBM), irrespective of other histopathological and clinical characteristics. All patients with a muscle biopsy showing endomysial inflammation with invasion of non-necrotic muscle fibers during the period 1979-2006 in two tertiary neuromuscular referral centers were classified into three groups: 1) patients whose biopsies also showed rimmed vacuoles; 2) patients whose biopsies showed no vacuoles but fulfilled clinical criteria for IBM, and 3) patients whose biopsies showed no vacuoles, and also did not fulfill clinical criteria for IBM (unclassified patients). These groups were compared with regard to age, gender, clinical features, and disease course including response to immunosuppressive treatment. Eighty-one individuals (41 men) were included. Rimmed vacuoles were found in 49 patients (60.5%). Fourteen patients (17.3%) fulfilled clinical criteria for IBM and 18 patients (22.2%) were unclassified at presentation. At follow up (mean duration 9 years) three women remained unclassified (4%). There were no differences in disease course or effect of treatment between the three groups. Men had more often rimmed vacuoles than women (73% vs 48%; p = 0.018), and women more often than men were unclassified. Women tended to show more often temporary improvement if treated (p = 0.07), but none had sustained improvement. In conclusion, patients with a muscle biopsy showing endomysial cell infiltration with invasion of non-necrotic muscle fibers most probably have IBM, regardless of clinical and other pathological features. Women lack typical features more often than men.
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Affiliation(s)
- J van de Vlekkert
- Department of Neurology, Academic Medical Center, University of Amsterdam, Meibergdreef 9, 1105 AZ, Amsterdam, The Netherlands.
| | - J E Hoogendijk
- Rudolf Magnus Institute for Neuroscience, Department of Neurology, University Medical Center Utrecht, Heidelberglaan 100, 3584 CX Utrecht, The Netherlands
| | - M de Visser
- Department of Neurology, Academic Medical Center, University of Amsterdam, Meibergdreef 9, 1105 AZ, Amsterdam, The Netherlands
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De Bleecker JL, De Paepe B, Aronica E, de Visser M, Amato A, Aronica E, Benveniste O, De Bleecker J, de Boer O, De Paepe B, de Visser M, Dimachkie M, Gherardi R, Goebel HH, Hilton-Jones D, Holton J, Lundberg IE, Mammen A, Mastaglia F, Nishino I, Rushing E, Schroder HD, Selcen D, Stenzel W. 205th ENMC International Workshop: Pathology diagnosis of idiopathic inflammatory myopathies part II 28-30 March 2014, Naarden, The Netherlands. Neuromuscul Disord 2014; 25:268-72. [PMID: 25572016 DOI: 10.1016/j.nmd.2014.12.001] [Citation(s) in RCA: 92] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2014] [Accepted: 12/02/2014] [Indexed: 11/27/2022]
Affiliation(s)
- Jan L De Bleecker
- Department of Neurology, Ghent University Hospital, De Pintelaan 185, 9000 Ghent, Belgium.
| | - Boel De Paepe
- Department of Neurology, Ghent University Hospital, De Pintelaan 185, 9000 Ghent, Belgium
| | - Eleonora Aronica
- Department of (Neuro)Pathology, Academic Medical Centre, Meibergdreef 9, 1105 AZ Amsterdam, The Netherlands
| | - Marianne de Visser
- Department of Neurology, Academic Medical Centre, Meibergdreef 9, 1105 AZ Amsterdam, The Netherlands
| | | | - Anthony Amato
- Brigham and Women's Hospital, Harvard Medical School, Boston, USA
| | | | | | | | - Onno de Boer
- Academic Medical Center, Amsterdam, The Netherlands
| | | | | | | | | | | | | | | | | | | | | | - Ichizo Nishino
- National Center of Neurology and Psychiatry, Kodaira Tokyo, Japan
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Wang H, Cai Y, Cai L, Hu Y, Chen X, Deng J. Altered lipid levels in untreated patients with early polymyositis. PLoS One 2014; 9:e89827. [PMID: 24587064 PMCID: PMC3933648 DOI: 10.1371/journal.pone.0089827] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2013] [Accepted: 01/26/2014] [Indexed: 02/05/2023] Open
Abstract
Background Little is known so far on the lipid profile in polymyositis (PM) patients. Our aim is to identify lipid profiles in untreated patients with early PM, to assess the association between lipid profiles and C-reactive protein (a sensitive marker of inflammation) in these patients. Methods and Findings This work was conducted as a case-control study. Sixty untreated patients with PM and 60 age- and sex-matched healthy controls were included. The duration of PM was less than six months, and none of them had received intermittent or regular corticosteroids or disease-modifying antirheumatic drugs or biological agents prior to the study. Triglyceride (TG), total cholesterol (TC), LDL-cholesterol (LDL-C), and HDL-cholesterol (HDL-C), and C-reactive protein (CRP) were assessed using standard techniques. Thirty patients (50%) had a decreased level of HDL-C and 47% had an increased level of TG. The levels of HDL-C, LDL-C, and TC in PM were significantly lower than in controls (P<0.001, P<0.01, P<0.001, respectively). The level of TG was significantly higher in PM than in controls (P<0.001). The level of very low LDL-cholesterol (VLDL-C), and the ratios of VLDL-C/LDL-C, TC/HDL-C, and LDL-C/HDL-C were significantly higher than in controls (all P<0.001). Serum CRP levels correlated negatively with HDL-C (r = −0.352, P = 0.006) and TC (r = −0.262, P = 0.043). After adjustment for age, gender, smoking, drinking, body mass index, and pulmonary fibrosis/infection, linear regression model demonstrated that CRP is associated with HDL-C among PM patients (P = 0.028). Conclusions Dyslipidemia is a common feature in patients with PM that is characterized by a decrease in HDL-C and an increase in TG, suggesting a high risk of atherosclerosis. The Inflammatory condition in PM may account for the metabolism of HDL-C.
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Affiliation(s)
- Han Wang
- Cardiovascular Disease Research Institute, The Third People’s Hospital of Chengdu, The Second Affiliated Chengdu Clinical College of Chongqing Medical University, Chengdu, Sichuan, People’s Republic of China
- Department of Surgery, Renmin Hospital of Hubei University of Medicine, Shiyan, Hubei, People’s Republic of China
| | - Yingying Cai
- Department of Geriatrics, West China Hospital, Sichuan University, Chengdu, Sichuan, People’s Republic of China
| | - Lin Cai
- Cardiovascular Disease Research Institute, The Third People’s Hospital of Chengdu, The Second Affiliated Chengdu Clinical College of Chongqing Medical University, Chengdu, Sichuan, People’s Republic of China
| | - Yingchun Hu
- Department of Geriatrics, West China Hospital, Sichuan University, Chengdu, Sichuan, People’s Republic of China
| | - Xianxiang Chen
- Department of Surgery, Renmin Hospital of Hubei University of Medicine, Shiyan, Hubei, People’s Republic of China
- * E-mail: (JD); (XC)
| | - Juelin Deng
- Department of Geriatrics, West China Hospital, Sichuan University, Chengdu, Sichuan, People’s Republic of China
- * E-mail: (JD); (XC)
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Vincze M, Danko K. Idiopathic inflammatory myopathies. Best Pract Res Clin Rheumatol 2013; 26:25-45. [PMID: 22424191 DOI: 10.1016/j.berh.2012.01.013] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Revised: 12/24/2011] [Accepted: 01/04/2012] [Indexed: 10/28/2022]
Abstract
Inflammatory myopathies are chronic, immune-mediated diseases characterised by progressive proximal muscle weakness. They encompass a variety of syndromes with protean manifestations. The diagnosis is based on Bohan and Peter's classification criteria, which nowadays seem to be obsolete. Our increasing knowledge about the risk factors, genetic susceptibility and immunological pathways in the disease mechanism leads to the establishment of a new, immunogenetically and serologically validated diagnostic criteria system. The treatment of idiopathic inflammatory myopathy is also a complex task requiring much experience. The aims of therapy are to increase muscle strength, prevent the development of contractures and manage the systemic manifestations of the disease. The most important one is the early detection of diseases and patients' immunological control in special centres. Using the basis therapeutic drugs temporary or permanent remission can be achieved, which improves patientsG' quality of life and functional ability. Rehabilitation and physiotherapy in the remission period may significantly improve the outcome of patients with functional disorders. The introduction of new biological therapies further allows us to control the myositis patients' state more effectively. The aim of this review is to summarise our knowledge about clinical symptoms, pathomechanism, as well as genetic, serologic and environmental risk factors. We would also like to present the way to diagnosis and the latest research about diagnostic criteria system, proposed outcome measures and therapeutic possibilities.
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Affiliation(s)
- Melinda Vincze
- University of Debrecen, Medical and Science Health Center, 3rd Department of Internal Medicine, Division of Immunology, Móricz Zs, Street 22, Debrecen H-4032, Hungary
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Hilton-Jones D. Observations on the classification of the inflammatory myopathies. Presse Med 2011; 40:e199-208. [PMID: 21377827 DOI: 10.1016/j.lpm.2010.10.035] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/04/2010] [Accepted: 10/15/2010] [Indexed: 01/19/2023] Open
Abstract
This brief review considers historical approaches to the classification of the inflammatory myopathies. The last 25 years have seen advances in our knowledge of the underlying immune mechanism but the initial trigger for the idiopathic inflammatory myopathies remains unknown. Existing classifications have their limitations, but with the absence of a "gold standard" a definitive classification is not yet possible. Despite these problems, a working classification is possible that is valuable for everyday clinical practice.
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Affiliation(s)
- David Hilton-Jones
- John Radcliffe Hospital, Muscle and Nerve Centre, Department of Neurology, West Wing, Oxford, OX3 9DU, United Kingdom.
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Dimitri D. Myopathies inflammatoires : diagnostic et classifications. Presse Med 2009; 38:1141-63. [DOI: 10.1016/j.lpm.2009.01.013] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/31/2008] [Revised: 12/22/2008] [Accepted: 01/14/2009] [Indexed: 02/04/2023] Open
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Abstract
Idiopathic inflammatory myopathies (notably polymyositis and dermatomyositis) are relatively uncommon diseases with a heterogeneous clinical presentation. Only a few randomized, double-blind, placebo-controlled trials have been performed, measures to assess outcome and response to treatment have to be validated. Initial treatment options of first choice are corticosteroids, although rarely tested in randomized, controlled trials. Unfortunately, not all patients respond to them and many develop undesirable side effects. Thus, second line agents or immunosuppressants given in combination with corticosteroids are used. For dermatomyositis/polymyositis, combination with azathioprine is most common. In case this combination is not sufficient or applicable, intravenous immunoglobulins are justified. Alternative or stronger immunosuppressants, such as cyclosporine A, cyclophosphamide, methotrexate, or mycophenolate are also used. There are no defined guidelines or best treatment protocols agreed on internationally; therefore, the medical approach must be individualized based on the severity of clinical presentation, disease duration, presence of extramuscular features, and prior therapy and contraindications to particular agents. Approximately 25% of patients are nonresponders and continue to experience clinical relapses. Those are candidates for alternative treatment options and experimental therapies. New immunoselective therapies directed toward cytokine modulation, immune cell migration, or modification of certain immune subsets (B- and T-cells) are a promising avenue of research and clinical application. Possible future therapeutic options are presented and discussed.
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Affiliation(s)
- Heinz Wiendl
- Department of Neurology, University of Wuerzburg, Wuerzburg, Germany.
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Bibliography. Current world literature. Raynaud phenomenon, scleroderma, overlap syndromes and other fibrosing syndromes. Curr Opin Rheumatol 2006; 18:654-6. [PMID: 17053515 DOI: 10.1097/bor.0b013e328010f1cd] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Bromberg MB. Advances in diagnosis and management of inflammatory myopathies. J Clin Neuromuscul Dis 2005; 6:167-179. [PMID: 19078770 DOI: 10.1097/01.cnd.0000167480.39597.95] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Idiopathic inflammatory myopathies are rare causes of muscle weakness and may be difficult to diagnose and manage. The traditional classification of polymyositis (PM) and dermatomyositis (DM) has been expanded to include inclusion body myositis (IBM) and several other types as our knowledge of underlying immunopathologic mechanisms, specific antibodies, and clinical features has advanced. This has led to several modified and new classification systems and also to controversies over specific criteria required to make diagnoses of the several forms of inflammatory myopathies. The clinical response to treatment of PM and DM has been largely empiric, and IBM has proven to be refractory. There are efforts to formalize objective measures of treatment response to aid future randomized, controlled trials. This article reviews new information in the field of idiopathic inflammatory myopathies from the neurologic clinical perspective.
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Affiliation(s)
- Mark B Bromberg
- From the Department of Neurology, University of Utah, Salt Lake City, UT
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