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Rosina S, Consolaro A, Pistorio A, Rebollo-Giménez A, Bracaglia C, Dolezalova P, Guilaisne Bernard-Medina A, Herlin T, Trachana M, Vargová V, Wouters C, Carenini L, Ruperto N, Ravelli A. Defining criteria for disease activity states in juvenile dermatomyositis based on the Juvenile Dermatomyositis Activity Index. RMD Open 2024; 10:e003093. [PMID: 38307698 PMCID: PMC10840041 DOI: 10.1136/rmdopen-2023-003093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Accepted: 05/22/2023] [Indexed: 02/04/2024] Open
Abstract
OBJECTIVES To develop and validate the cut-offs in the Juvenile DermatoMyositis Activity Index (JDMAI) to distinguish the states of inactive disease (ID), low disease activity (LDA), moderate disease activity (MDA) and high disease activity (HDA) in children with juvenile dermatomyositis (JDM). METHODS For cut-off definition, data from 139 patients included in a randomised clinical trial were used. Among the six versions of the JDMAI, JDMA1 (score range 0-40) and JDMAI2 (score range 0-39) were selected. Optimal cut-offs were determined against external criteria by calculating different percentiles of score distribution and through receiver operating characteristic curve analysis. External criteria included the modified Pediatric Rheumatology International Trials Organization (PRINTO) criteria for clinically ID in JDM (for ID) and PRINTO levels of improvement in the clinical trial (for LDA and HDA). MDA cut-offs were set at the score interval between LDA and HDA cut-offs. Cut-off validation was conducted by assessing construct and discriminative ability in two cohorts including a total of 488 JDM patients. RESULTS The calculated JDMAI1 cut-offs were ≤2.4 for ID, ≤6.6 for LDA, 6.7-11 for MDA and >11 for HDA. The calculated JDMAI2 cut-offs were ≤5.2 for ID, ≤8.5 for LDA, 8.6-11.3 for MDA and >11.3 for HDA. The cut-offs discriminated strongly among disease activity states defined subjectively by caring physicians and parents, parents' satisfaction or non-satisfaction with illness outcome, levels of pain, fatigue, physical functional impairment and physical well-being. CONCLUSIONS Both JDMAI1 and JDMAI2 cut-offs revealed good metrologic properties in validation analyses and are, therefore, suited for application in clinical practice and research.
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Affiliation(s)
- Silvia Rosina
- UOC Reumatologia e Malattie Autoinfiammatorie, IRCCS Istituto Giannina Gaslini, Genova, Italy
| | - Alessandro Consolaro
- UOC Reumatologia e Malattie Autoinfiammatorie, IRCCS Istituto Giannina Gaslini, Genova, Italy
- Department of Neurosciences, Rehabilitation, Ophthalmology, Genetics and Maternal-Infantile Sciences (DiNOGMI), University of Genoa, Genova, Italy
| | - Angela Pistorio
- Direzione Scientifica, IRCCS Istituto Giannina Gaslini, Genoa, Italy
| | - Ana Rebollo-Giménez
- UOC Reumatologia e Malattie Autoinfiammatorie, IRCCS Istituto Giannina Gaslini, Genova, Italy
| | - Claudia Bracaglia
- Division of Rheumatology, Ospedale Pediatrico Bambino Gesu, Rome, Italy
| | - Pavla Dolezalova
- 1st Faculty of Medicine, Charles University, General University Hospital in Prague, Prague, Czech Republic
| | - Ana Guilaisne Bernard-Medina
- Servicio de Reumatología, Hospital Civil de Guadalajara Unidad Hospitalaria Fray Antonio Alcalde, Guadalajara, Mexico
| | - Troels Herlin
- Pediatric Rheumatology Unit, Aarhus University Hospital, Aarhus, Denmark
| | - Maria Trachana
- Thessaloniki University School of Medicine, First Department of Pediatrics, Pediatric Immunology and Rheumatology Referral Center, Hippokration General Hospital, Thessaloniki, Greece
| | - Veronika Vargová
- Department of Paediatrics and Adolescent Medicine, Faculty of Medicine, Pavol Jozef Šafárik University in Košice, Kosice, Slovakia
| | - Carine Wouters
- Pediatric Rheumatology and Immune-inflammatory diseases, and KU Leuven - University of Leuven, Department of Microbiology and Immunology, Laboratory Immunobiology, UZ Leuven - Universitair ziekenhuis, Leuven, Belgium
| | - Laura Carenini
- UOC Servizio Sperimentazioni Cliniche Pediatriche, IRCCS Istituto Giannina Gaslini, Genoa, Italy
| | - Nicolino Ruperto
- UOC Servizio Sperimentazioni Cliniche Pediatriche, IRCCS Istituto Giannina Gaslini, Genoa, Italy
| | - Angelo Ravelli
- Department of Neurosciences, Rehabilitation, Ophthalmology, Genetics and Maternal-Infantile Sciences (DiNOGMI), University of Genoa, Genova, Italy
- Direzione Scientifica, IRCCS Istituto Giannina Gaslini, Genoa, Italy
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Weiden C, Saers M, Schwarz T, Hinze T, Wittkowski H, Kessel C, Masjosthusmann K, Mohr M, Evers G, Oesingmann-Weirich S, Foell D, Hinze CH. Type 1 Interferon-Stimulated Gene Expression and Disease Activity in Pediatric Rheumatic Diseases: No Composite Scores Needed? ACR Open Rheumatol 2023. [PMID: 37786243 DOI: 10.1002/acr2.11618] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Revised: 08/23/2023] [Accepted: 09/04/2023] [Indexed: 10/04/2023] Open
Abstract
OBJECTIVE Rheumatic diseases are characterized by different patterns of immune overactivation. This study investigated the correlation of whole blood type 1 interferon (IFN) stimulated gene (ISG), IL18, and CXCL9 expression with clinical disease activity in pediatric rheumatic diseases and assessed the required number of ISGs to be included in a composite type 1 IFN score. METHODS Whole blood-derived RNA and clinical data were collected from 171 mostly pediatric patients with connective tissue diseases (CTDs), systemic autoinflammatory diseases (SAIDs), monogenic interferonopathies (IFNPs) and other inflammatory diseases, and from 38 controls. The expression of six previously established ISGs, IL18, and CXCL9 was assessed by real-time polymerase chain reaction (471 samples). Individual and composite gene expression was assessed, and correlation and threshold analyses were performed. RESULTS Correlation between ISG expression and clinical disease activity was strongest in CTD, especially in juvenile dermatomyositis (JDM) and IFNP, and modest in patients with SAID. Threshold ISG expression levels for the detection of at least mild clinical disease activity were substantially higher in patients with systemic lupus erythematosus compared with JDM. The correlation of expression levels of limited sets of ISGs and even individual ISGs with clinical disease activity were not inferior to a composite score of six ISGs. CONCLUSION In a real-world cohort, individual ISG expression levels robustly reflected clinical disease activity in CTD and IFNP, especially in JDM, which would simplify such analyses in clinical routine and be more cost-effective. Threshold levels varied across diseases, potentially reflecting different mechanisms of type 1 IFN overactivation.
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Affiliation(s)
| | | | | | - Tanja Hinze
- University Hospital Muenster, Muenster, Germany
| | | | | | | | | | - Georg Evers
- University Hospital Muenster, Muenster, Germany
| | | | - Dirk Foell
- University Hospital Muenster, Muenster, Germany
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Development and Preliminary Validation of an Electromyography-Scoring Protocol for the Assessment and Grading of Muscle Involvement in Patients With Juvenile Idiopathic Inflammatory Myopathies. Pediatr Neurol 2021; 124:6-10. [PMID: 34507251 DOI: 10.1016/j.pediatrneurol.2021.07.017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Revised: 07/16/2021] [Accepted: 07/31/2021] [Indexed: 02/03/2023]
Abstract
INTRODUCTION We performed a pilot study in order to investigate the feasibility of an electromyography (EMG)-scoring protocol for the assessment of disease activity in juvenile idiopathic inflammatory myopathies (JIIM). METHODS Children with JIIM followed up in a tertiary-level care center underwent standardized clinical, laboratory, and EMG assessment. An EMG-scoring protocol was devised by a consensus panel including a pediatric neurophysiologist and two pediatric rheumatologists, based on a combined score obtained as the sum of (1) the presence of denervation signs (fibrillation potentials) and (2) motor unit remodeling (mixed pattern of short- and long-duration motor unit action potentials). The EMG-scoring protocol was then validated following the Outcome Measures in Rheumatoid Arthritis Clinical Trials filter for outcome measures in rheumatology and the consensus-based standards for the selection of health measurement instruments methodology. RESULTS Thirteen children (77% females) were included in the study, with a median age of 10 years (interquartile range: 7-17 years) and median disease duration of 11.8 months (interquartile range: 2.1-44.5). A total of 39 EMG examinations were evaluated. A strong positive association between a standardized tool for muscle strength assessment and the combined score was observed. No significant associations were found with both creatine kinase and erythrocyte sedimentation rate levels. DISCUSSION Our EMG-scoring protocol is the first standardized and reproducible tool for the neurophysiologic evaluation and grading of muscle involvement in patients with JIIM and could provide relevant additional information in the assessment and follow-up of these rare conditions.
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Ringold S, Consolaro A, Ardoin SP. Outcome Measures in Pediatric Rheumatic Disease. Rheum Dis Clin North Am 2021; 47:655-668. [PMID: 34635297 DOI: 10.1016/j.rdc.2021.07.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Reliable and responsive outcome measures that accurately detect changes in disease state, activity, and damage are crucial to conducting observational and interventional trials that can directly transform care for children with rheumatic disease. A combination of consensus-based and direct measurement approaches has led to the development of several validated, composite outcome measures in juvenile idiopathic arthritis, juvenile dermatomyositis, childhood-onset systemic lupus erythematosus, and pediatric vasculitis. This review outlines clinician-reported, disease-specific outcome measures developed for these conditions.
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Affiliation(s)
- Sarah Ringold
- Seattle Children's, 4800 Sand Point Way Northeast, Seattle, WA 98115, USA.
| | - Alessandro Consolaro
- Rheumatology Unit, Istituto Giannina Gaslini, University of Genoa, Via Gerolamo Gaslini 5, 16147 Genoa, Italy
| | - Stacy P Ardoin
- Department of Pediatrics, Nationwide Children's Hospital, Ohio State University, 700 Children's Drive, Columbus, OH 43205, USA
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Kim H, Huber AM, Kim S. Updates on Juvenile Dermatomyositis from the Last Decade: Classification to Outcomes. Rheum Dis Clin North Am 2021; 47:669-690. [PMID: 34635298 DOI: 10.1016/j.rdc.2021.07.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Juvenile dermatomyositis (JDM) is a heterogeneous disease with new classification criteria and updates in myositis-specific autoantibody and myositis-associated antibody groups. There are many validated assessment tools for assessing disease activity in JDM. Future studies will optimize these tools and improve feasibility in clinical and research contexts. Genetic and environmental risk factors, mechanisms of muscle pathology, role of interferon, vascular markers, and changes in immune cells provide insights to JDM pathogenesis. Outcomes have improved, but chronic disease, damage, and mortality highlight the need for better outcome predictors and treatments. Increased collaboration of stakeholders may help overcome research barriers and improve JDM treatment.
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Affiliation(s)
- Hanna Kim
- Juvenile Myositis Pathogenesis and Therapeutics Unit, National Institute of Arthritis Musculoskeletal and Skin Diseases, National Institutes of Health, 10 Center Drive, Building 10, 12N-240, Bethesda, MD 20892, USA.
| | - Adam M Huber
- IWK Health Centre and Dalhousie University, Division of Pediatric Rheumatology, 5850 University Avenue, Halifax, Nova Scotia B3K 6R8, Canada
| | - Susan Kim
- University of California, San Francisco, 550 16th Street, San Francisco, CA 94158, USA
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Review for best practice in clinical rheumatology juvenile systemic sclerosis - Updates and practice points. Best Pract Res Clin Rheumatol 2021; 35:101688. [PMID: 33896752 DOI: 10.1016/j.berh.2021.101688] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Juvenile systemic sclerosis (jSSc) is a rare, severe autoimmune disease associated with life-threatening multiorgan inflammatory-driven fibrosis. Recognition early in the disease process, when treatment is more effective, is critical. We outline insights from the authors, who specialize and host jSSc cohorts, combined with recent literature review combining available juvenile-onset and applicable adult-onset studies regarding SSc evaluation, which can be extrapolated to children. Practice tips are provided for each main organ system.
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Leung AKC, Lam JM, Alobaida S, Leong KF, Wong AHC. Juvenile Dermatomyositis: Advances in Pathogenesis, Assessment, and Management. Curr Pediatr Rev 2021; 17:273-287. [PMID: 33902423 DOI: 10.2174/1573396317666210426105045] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Revised: 02/15/2021] [Accepted: 02/18/2021] [Indexed: 11/22/2022]
Abstract
BACKGROUND Juvenile dermatomyositis is the most common inflammatory myopathy in the pediatric age group and a major cause of mortality and morbidity in individuals with childhood rheumatic diseases. Mounting evidence suggests that early diagnosis and timely aggressive treatment are associated with better outcomes. OBJECTIVE The purpose of this article is to provide readers with an update on the evaluation, diagnosis, and the treatment of juvenile dermatomyositis. METHODS A PubMed search was performed in Clinical Queries using the key term "juvenile dermatomyositis" in the search engine. The search strategy included meta-analyses, randomized controlled trials, clinical trials, observational studies, and reviews. The search was restricted to English literature. The information retrieved from the above search was used in the compilation of the present article. RESULTS Juvenile dermatomyositis is a chronic autoimmune inflammatory condition characterized by systemic capillary vasculopathy that primarily affects the skin and muscles with possible involvement of other organs. In 2017, the European League Against Rheumatism (EULAR) and the American College of Rheumatology (ACR) developed diagnostic criteria for juvenile idiopathic inflammatory myopathies and juvenile dermatomyositis. In the absence of muscle biopsies which are infrequently performed in children, scores (in brackets) are assigned to four variables related to muscle weakness, three variables related to skin manifestations, one variable related to other clinical manifestations, and two variables related to laboratory measurements to discriminate idiopathic inflammatory myopathies from non-idiopathic inflammatory myopathies as follows: objective symmetric weakness, usually progressive, of the proximal upper extremities (0.7); objective symmetric weakness, usually progressive, of the proximal lower extremities (0.8); neck flexors relatively weaker than neck extensors (1.9); leg proximal muscles relatively weaker than distal muscles (0.9); heliotrope rash (3.1); Gottron papules (2.1); Gottron sign (3.3); dysphagia or esophageal dysmotility (0.7); the presence of anti-Jo-1 autoantibody (3.9); and elevated serum levels of muscle enzymes (1.3). In the absence of muscle biopsy, a definite diagnosis of idiopathic inflammatory myopathy can be made if the total score is ≥7.5. Patients whose age at onset of symptoms is less than 18 years and who meet the above criteria for idiopathic inflammatory myopathy and have a heliotrope rash, Gottron papules or Gottron sign are deemed to have juvenile dermatomyositis. The mainstay of therapy at the time of diagnosis is a high-dose corticosteroid (oral or intravenous) in combination with methotrexate. CONCLUSION For mild to moderate active muscle disease, early aggressive treatment with high-dose oral prednisone alone or in combination with methotrexate is the cornerstone of management. Pulse intravenous methylprednisolone is often preferred to oral prednisone in more severely affected patients, patients who respond poorly to oral prednisone, and those with gastrointestinal vasculopathy. Other steroid-sparing immunosuppressive agents such as cyclosporine and cyclophosphamide are reserved for patients with contraindications or intolerance to methotrexate and for refractory cases, as the use of these agents is associated with more adverse events. Various biological agents have been used in the treatment of juvenile dermatomyositis. Data on their efficacy are limited, and their use in the treatment of juvenile dermatomyositis is considered investigational.
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Affiliation(s)
- Alexander K C Leung
- Department of Pediatrics, The University of Calgary, Alberta Children's Hospital, Calgary, Alberta,Canada
| | - Joseph M Lam
- Department of Pediatrics and Department of Dermatology and Skin Sciences, The University of British Columbia, Vancouver, British Columbia,Canada
| | - Saud Alobaida
- Department of Dermatology, King Faisal Specialist Hospital & Research Centre, Riyadh,Saudi Arabia
| | - Kin F Leong
- Pediatric Institute, Kuala Lumpur General Hospital, Kuala Lumpur,Malaysia
| | - Alex H C Wong
- Department of Family Medicine, The University of Calgary, Calgary, Alberta,Canada
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Rosina S, Varnier GC, Pistorio A, Pilkington C, Maillard S, Civino A, Tsitsami E, Bracaglia C, Jelusic M, Cespedes-Cruz A, Espada G, Cimaz R, Couillault G, Joos R, Quartier P, Rao AP, Malattia C, Ruperto N, Consolaro A, Ravelli A. Development and Testing of Reduced Versions of the Manual Muscle Test-8 in Juvenile Dermatomyositis. J Rheumatol 2020; 48:898-906. [PMID: 33191283 DOI: 10.3899/jrheum.200543] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/02/2020] [Indexed: 01/17/2023]
Abstract
OBJECTIVE To develop and test shortened versions of the Manual Muscle Test-8 (MMT-8) in juvenile dermatomyositis (JDM). METHODS Construction of reduced tools was based on a retrospective analysis of individual scores of MMT-8 muscle groups in 3 multinational datasets. The 4 and 6 most frequently impaired muscle groups were included in MMT-4 and MMT-6, respectively. Metrologic properties of reduced tools were assessed by evaluating construct validity, internal consistency, discriminant ability, and responsiveness to change. RESULTS Neck flexors, hip extensors, hip abductors, and shoulder abductors were included in MMT-4, whereas MMT-6 also included elbow flexors and hip flexors. Both shortened tools revealed strong correlations with MMT-8 and other muscle strength measures. Correlations with other JDM outcome measures were in line with predictions. Internal consistency was good (0.88-0.96) for both MMT-4 and MMT-6. Both reduced tools showed strong ability to discriminate between disease activity states, assessed by the caring physician or a parent (P < 0.001), and between patients whose parents were satisfied or not satisfied with illness course (P < 0.001). Responsiveness to change (assessed by both standardized response mean and relative efficiency) of MMT-4 and, to a lesser degree, MMT-6, was slightly superior to that of MMT-8. CONCLUSION Overall, the metrologic performance of MMT-4 and MMT-6 was comparable to that of the other established muscle strength tools, which indicates that they may be suitable for use in clinical practice and research, including clinical trials. The measurement properties of these tools should be further tested in other patient populations and evaluated prospectively.
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Affiliation(s)
- Silvia Rosina
- S. Rosina, MD, PhD, N. Ruperto, MD, MPH, UOC Clinica Pediatrica e Reumatologia, IRCCS Istituto Giannina Gaslini, Genoa, Italy;
| | - Giulia C Varnier
- G.C. Varnier, MD, PhD, Pediatric Rheumatology Department, Royal Manchester Children's Hospital, Manchester, UK
| | - Angela Pistorio
- A. Pistorio, MD, PhD, Dipartimento di Epidemiologia e Biostatistica, IRCCS Istituto Giannina Gaslini, Genoa, Italy
| | - Clarissa Pilkington
- C. Pilkington, MD, S. Maillard, PhD, PT, Division of Rheumatology, Great Ormond Street Hospital, London, UK
| | - Susan Maillard
- C. Pilkington, MD, S. Maillard, PhD, PT, Division of Rheumatology, Great Ormond Street Hospital, London, UK
| | - Adele Civino
- A. Civino, MD, UOC Pediatria, Ospedale Vito Fazzi, Lecce, Italy
| | - Elena Tsitsami
- E. Tsitsami, MD, PhD, 1st Department of Pediatrics, School of Medicine, University of Athens, Children's Hospital Agia Sofia, Athens, Greece
| | - Claudia Bracaglia
- C. Bracaglia, MD, Division of Rheumatology, Ospedale Pediatrico Bambino Gesù, Rome, Italy
| | - Marija Jelusic
- M. Jelusic, MD, PhD, Department of Pediatrics, University of Zagreb School of Medicine, Zagreb, Croatia
| | - Adriana Cespedes-Cruz
- A. Cespedes-Cruz, MD, Division of Rheumatology, UMAE Hospital General La Raza, Mexico City, Mexico
| | - Graciela Espada
- G. Espada, MD, Division of Rheumatology, Hospital de Niños Ricardo Gutiérrez, Buenos Aires, Argentina
| | - Rolando Cimaz
- R. Cimaz, MD, Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy
| | - Gerard Couillault
- G. Couillault, MD, Immunology, Hematology and Oncology Unit, Children's Hospital, Dijon, France
| | - Rik Joos
- R. Joos, MD, Pediatric Rheumatology, Ghent University Hospital, Ghent, Belgium
| | - Pierre Quartier
- P. Quartier, MD, Institut IMAGINE, Centre de référence national pour les Rhumatismes inflammatoires et les maladies Auto-Immunes Systémiques rares de l'Enfant (RAISE), Université de Paris and Unité d'Immunologie, Hématologie et Rhumatologie Pédiatrique, Hôpital Necker-Enfants Malades, AP-HP, Paris, France
| | - Anand P Rao
- A.P. Rao, MD, Division of Rheumatology, Manipal Hospital, Bangalore, India
| | - Clara Malattia
- C. Malattia, MD, PhD, A. Consolaro, MD, PhD, UOC Clinica Pediatrica e Reumatologia, IRCCS Istituto Giannina Gaslini and Dipartimento di Neuroscienze, Riabilitazione, Oftalmologia, Genetica e Scienze Materno-Infantili (DiNOGMI), Università degli Studi di Genova, Genoa, Italy
| | - Nicolino Ruperto
- S. Rosina, MD, PhD, N. Ruperto, MD, MPH, UOC Clinica Pediatrica e Reumatologia, IRCCS Istituto Giannina Gaslini, Genoa, Italy
| | - Alessandro Consolaro
- C. Malattia, MD, PhD, A. Consolaro, MD, PhD, UOC Clinica Pediatrica e Reumatologia, IRCCS Istituto Giannina Gaslini and Dipartimento di Neuroscienze, Riabilitazione, Oftalmologia, Genetica e Scienze Materno-Infantili (DiNOGMI), Università degli Studi di Genova, Genoa, Italy
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Identification of Potential Biomarkers and Biological Pathways in Juvenile Dermatomyositis Based on miRNA-mRNA Network. BIOMED RESEARCH INTERNATIONAL 2019; 2019:7814287. [PMID: 31886250 PMCID: PMC6925816 DOI: 10.1155/2019/7814287] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/03/2019] [Revised: 09/14/2019] [Accepted: 11/08/2019] [Indexed: 01/09/2023]
Abstract
Objective The aim of this study is to explore the potential pathogenesis of juvenile dermatomyositis by bioinformatics analysis of gene chips, which would screen the hub genes, identify potential biomarkers, and reveal the development mechanism of juvenile dermatomyositis. Material and Methods We retrieved juvenile dermatomyositis's original expression microarray data of message RNAs (mRNAs) and microRNAs (miRNAs) from NCBI's Gene Expression Omnibus database (GEO, http://www.ncbi.nlm.nih.gov/geo/); through the R package of limma in Bioconductor, we can screen the differentially expressed miRNAs and mRNAs, and then we further analyzed the predicted target genes by the methods such as Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway enrichment analysis and miRNA-mRNA regulatory network construction and protein-protein interaction (PPI) network using Cytoscape 3.6.1. Results Compared with normal juvenile skin tissues, 6 upregulated microRNAs and 5 downregulated microRNAs were identified from 166 downregulated microRNAs and 58 upregulated microRNAs in juvenile dermatomyositis tissues. The enrichment pathways of differentially expressed microRNAs include cell adhesion molecules (CAMs), autoimmune thyroid disease, Type I diabetes mellitus, antigen and presentation, viral myocardium, graft-versus-host disease, and Kaposi sarcoma-associated herpes virus infection. By screening of microRNA-messenger RNA regulatory network and construction of PPI network map, three target miRNAs were identified, namely, miR-193b, miR-199b-5p, and miR-665. Conclusion We identified mir-193b, mir-199b-5p, and mir-6653 target miRNAs by exploring the miRNA-mRNA regulation network mechanism related to the pathogenesis of juvenile dermatomyositis, which will be of great significance for further study on the pathogenesis and targeted therapy of juvenile dermatomyositis.
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