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Okiyama N, Ichimura Y, Shobo M, Tanaka R, Kubota N, Saito A, Ishitsuka Y, Watanabe R, Fujisawa Y, Nakamura Y, Murakami A, Kayama H, Takeda K, Fujimoto M. Immune response to dermatomyositis-specific autoantigen, transcriptional intermediary factor 1γ can result in experimental myositis. Ann Rheum Dis 2021; 80:1201-1208. [PMID: 33811031 DOI: 10.1136/annrheumdis-2020-218661] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Revised: 03/09/2021] [Accepted: 03/21/2021] [Indexed: 02/06/2023]
Abstract
OBJECTIVES To investigate whether autoimmunity to transcriptional intermediary factor 1 (TIF1)γ, a ubiquitous nuclear autoantigen for myositis-specific autoantibodies detected in patients with dermatomyositis (DM) is pathogenetic for inflammatory myopathy. METHODS Wild-type, β2-microglobulin-null, perforin-null, Igμ-null and interferon α/β receptor (IFNAR)-null mice were immunised with recombinant human TIF1γ whole protein. A thymidine incorporation assay was performed using lymph node T cells from TIF1γ-immunised mice. Plasma was analysed using immunoprecipitation followed by western blot analysis and enzyme-linked immunosorbent assays. Femoral muscles were histologically and immunohistochemically evaluated. CD8+ or CD4+ T cells isolated from lymph node T cells or IgG purified from plasma were adoptively transferred to naïve mice. TIF1γ-immunised mice were treated with anti-CD8 depleting antibody and a Janus kinase inhibitor, tofacitinib. RESULTS Immunisation with TIF1γ-induced experimental myositis presenting with necrosis/atrophy of muscle fibres accompanied by CD8+ T cell infiltration successfully in wild-type mice, in which TIF1γ-specific T cells and antihuman and murine TIF1γ IgG antibodies were detected. The incidence and severity of myositis were significantly lower in β₂-microglobulin-null, perforin-null, CD8-depleted or IFNAR-null mice, while Igμ-null mice developed myositis normally. Adoptive transfer of CD8+ T cells induced myositis in recipients, while transfer of CD4+ T cells or IgG did not. Treatment with tofacitinib inhibited TIF1γ-induced myositis. CONCLUSIONS Here we show that TIF1γ is immunogenic enough to cause experimental myositis, in which CD8+ T cells and type I interferons, but not CD4+ T cells, B cells or antibodies, are required. This murine model would be a tool for understanding the pathologies of DM.
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Affiliation(s)
- Naoko Okiyama
- Department of Dermatology, Faculty of Medicine, University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - Yuki Ichimura
- Department of Dermatology, Faculty of Medicine, University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - Miwako Shobo
- Department of Dermatology, Faculty of Medicine, University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - Ryota Tanaka
- Department of Dermatology, Faculty of Medicine, University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - Noriko Kubota
- Department of Dermatology, Faculty of Medicine, University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - Akimasa Saito
- Department of Dermatology, Faculty of Medicine, University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - Yosuke Ishitsuka
- Department of Dermatology, Faculty of Medicine, University of Tsukuba, Tsukuba, Ibaraki, Japan.,Department of Integrative Medicine for Allergic and Immunological Disease, Graduate School of Medicine, Osaka University, Suita, Osaka, Japan
| | - Rei Watanabe
- Department of Dermatology, Faculty of Medicine, University of Tsukuba, Tsukuba, Ibaraki, Japan.,Department of Integrative Medicine for Allergic and Immunological Disease, Graduate School of Medicine, Osaka University, Suita, Osaka, Japan
| | - Yasuhiro Fujisawa
- Department of Dermatology, Faculty of Medicine, University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - Yoshiyuki Nakamura
- Department of Dermatology, Faculty of Medicine, University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - Akihiro Murakami
- Medical and Biological Laboratories Co Ltd, Nagoya, Aichi, Japan
| | - Hisako Kayama
- Institute for Advanced Co-Creation Studies, Osaka University, Suita, Osaka, Japan
| | - Kiyoshi Takeda
- Department of Microbiology and Immunology, Graduate School of Medicine, Osaka University, Suita, Osaka, Japan
| | - Manabu Fujimoto
- Department of Dermatology, Faculty of Medicine, University of Tsukuba, Tsukuba, Ibaraki, Japan.,Department of Dermatology, Graduate School of Medicine, Osaka University, Suita, Osaka, Japan
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2
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Mammen AL, Allenbach Y, Stenzel W, Benveniste O. 239th ENMC International Workshop: Classification of dermatomyositis, Amsterdam, the Netherlands, 14-16 December 2018. Neuromuscul Disord 2019; 30:70-92. [PMID: 31791867 DOI: 10.1016/j.nmd.2019.10.005] [Citation(s) in RCA: 133] [Impact Index Per Article: 26.6] [Reference Citation Analysis] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2019] [Accepted: 10/21/2019] [Indexed: 12/29/2022]
Affiliation(s)
- Andrew L Mammen
- Muscle Disease Unit, Laboratory of Muscle Stem Cells and Gene Regulation, National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, 50 South Drive, Building 50, Room 1146, MD 20892, United States.
| | - Yves Allenbach
- Department of Internal Medicine and Clinical Immunology, Pitié Salpetrière Hospital, AP-HP Sorbonne University, Paris, France
| | - Werner Stenzel
- Department of Neuropathology, Charité-Universitatsmedizin, Berlin, Germany
| | - Olivier Benveniste
- Department of Internal Medicine and Clinical Immunology, Pitié Salpetrière Hospital, AP-HP Sorbonne University, Paris, France
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Yang SH, Chang C, Lian ZX. Polymyositis and dermatomyositis - challenges in diagnosis and management. J Transl Autoimmun 2019; 2:100018. [PMID: 32743506 PMCID: PMC7388349 DOI: 10.1016/j.jtauto.2019.100018] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2019] [Accepted: 10/04/2019] [Indexed: 02/06/2023] Open
Abstract
Polymyositis (PM) and dermatomyositis (DM) are different disease subtypes of idiopathic inflammatory myopathies (IIMs). The main clinical features of PM and DM include progressive symmetric, predominantly proximal muscle weakness. Laboratory findings include elevated creatine kinase (CK), autoantibodies in serum, and inflammatory infiltrates in muscle biopsy. Dermatomyositis can also involve a characteristic skin rash. Both polymyositis and dermatomyositis can present with extramuscular involvement. The causative factor is agnogenic activation of immune system, leading to immunologic attacks on muscle fibers and endomysial capillaries. The treatment of choice is immunosuppression. PM and DM can be distinguished from other IIMs and myopathies by thorough history, physical examinations and laboratory evaluation and adherence to specific and up-to-date diagnosis criteria and classification standards. Treatment is based on correct diagnosis of these conditions. Challenges of diagnosis and management influences the clinical research and practice of Polymyositis and dermatomyositis. Diagnostic criteria have been updated and novel therapies have been developed in PM/DM. Pathogenesis investigation and diagnosis precision improvement may help to guide future treatment strategies.
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Key Words
- APC, antigen presenting cell
- AZA, Azathioprine
- CAM, cancer associated myositis
- CK, creatine kinase
- DM, dermatomyositis
- Dermatomyositis
- Diagnosis criteria
- EMG, electromyography
- HLA, human leukocyte antigen
- IIM, idiopathic inflammatory myopathies
- ILD, interstitial lung disease
- IV, intravenous
- Idiopathic inflammatory myopathy
- JDM, juvenile dermatomyositis
- MAA, myositis associated antibody
- MAC, membrane attack complex
- MHC, major histocompatibility complex
- MMF, mycophenolate mofetil
- MRI, magnetic resonance imaging
- MSA, myositis specific antibody
- MTX, methotrexate
- MUAP, motor unit action potential
- NAM, necrotizing autoimmune myopathy
- PM, polymyositis
- Polymyositis
- TNF, tumor necrosis factor
- Treatment
- Treg, regulatory T cell
- UVR, ultraviolet radiation
- sIBM, sporadic inclusion body myositis
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Affiliation(s)
- Shu-Han Yang
- Chronic Disease Laboratory, Institutes for Life Sciences and School of Medicine, South China University of Technology, Guangzhou, 510006, China
| | - Christopher Chang
- Division of Rheumatology, Allergy and Clinical Immunology, University of California, Davis, Davis, CA, USA.,Division of Pediatric Immunology and Allergy, Joe DiMaggio Children's Hospital, Hollywood, FL, USA
| | - Zhe-Xiong Lian
- Chronic Disease Laboratory, Institutes for Life Sciences and School of Medicine, South China University of Technology, Guangzhou, 510006, China
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Evans JM, Noorai RE, Tsai KL, Starr-Moss AN, Hill CM, Anderson KJ, Famula TR, Clark LA. Beyond the MHC: A canine model of dermatomyositis shows a complex pattern of genetic risk involving novel loci. PLoS Genet 2017; 13:e1006604. [PMID: 28158183 PMCID: PMC5315411 DOI: 10.1371/journal.pgen.1006604] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Revised: 02/17/2017] [Accepted: 01/24/2017] [Indexed: 01/04/2023] Open
Abstract
Juvenile dermatomyositis (JDM) is a chronic inflammatory myopathy and vasculopathy driven by genetic and environmental influences. Here, we investigated the genetic underpinnings of an analogous, spontaneous disease of dogs also termed dermatomyositis (DMS). As in JDM, we observed a significant association with a haplotype of the major histocompatibility complex (MHC) (DLA-DRB1*002:01/-DQA1*009:01/-DQB1*001:01), particularly in homozygosity (P-val = 0.0001). However, the high incidence of the haplotype among healthy dogs indicated that additional genetic risk factors are likely involved in disease progression. We conducted genome-wide association studies in two modern breeds having common ancestry and detected strong associations with novel loci on canine chromosomes 10 (P-val = 2.3X10-12) and 31 (P-val = 3.95X10-8). Through whole genome resequencing, we identified primary candidate polymorphisms in conserved regions of PAN2 (encoding p.Arg492Cys) and MAP3K7CL (c.383_392ACTCCACAAA>GACT) on chromosomes 10 and 31, respectively. Analyses of these polymorphisms and the MHC haplotypes revealed that nine of 27 genotypic combinations confer high or moderate probability of disease and explain 93% of cases studied. The pattern of disease risk across PAN2 and MAP3K7CL genotypes provided clear evidence for a significant epistatic foundation for this disease, a risk further impacted by MHC haplotypes. We also observed a genotype-phenotype correlation wherein an earlier age of onset is correlated with an increased number of risk alleles at PAN2 and MAP3K7CL. High frequencies of multiple genetic risk factors are unique to affected breeds and likely arose coincident with artificial selection for desirable phenotypes. Described herein is the first three-locus association with a complex canine disease and two novel loci that provide targets for exploration in JDM and related immunological dysfunction.
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Affiliation(s)
- Jacquelyn M. Evans
- Department of Genetics and Biochemistry, Clemson University, Clemson, South Carolina, United States of America
| | - Rooksana E. Noorai
- Department of Genetics and Biochemistry, Clemson University, Clemson, South Carolina, United States of America
- Genomics and Computational Laboratory, Clemson University, Clemson, South Carolina, United States of America
| | - Kate L. Tsai
- Department of Genetics and Biochemistry, Clemson University, Clemson, South Carolina, United States of America
| | - Alison N. Starr-Moss
- Department of Genetics and Biochemistry, Clemson University, Clemson, South Carolina, United States of America
| | - Cody M. Hill
- Department of Genetics and Biochemistry, Clemson University, Clemson, South Carolina, United States of America
| | - Kendall J. Anderson
- Department of Genetics and Biochemistry, Clemson University, Clemson, South Carolina, United States of America
| | - Thomas R. Famula
- Department of Animal Science, University of California, Davis, California, United States of America
| | - Leigh Anne Clark
- Department of Genetics and Biochemistry, Clemson University, Clemson, South Carolina, United States of America
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Overexpression of MHC class I in muscle of lymphocyte-deficient mice causes a severe myopathy with induction of the unfolded protein response. THE AMERICAN JOURNAL OF PATHOLOGY 2013; 183:893-904. [PMID: 23850081 DOI: 10.1016/j.ajpath.2013.06.003] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2012] [Revised: 05/10/2013] [Accepted: 06/04/2013] [Indexed: 12/20/2022]
Abstract
Muscle fibers do not normally express major histocompatibility complex class I (MHC-I) molecules, and their reexpression is a hallmark of inflammatory myopathies. It has been shown in mice that overexpression of MHC-I induces a poorly inflammatory myositis accompanied by the unfolded protein response (UPR), but it is unclear whether it is attributable to T-cell-mediated MHC-I-dependent immune responses or to MHC-I forced expression per se. Indeed, besides presenting antigenic peptides to CD8(+) T cells, MHC-I may also possibly exert nonimmunologic, yet poorly understood pathogenic effects. Thus, we investigated the pathogenicity of MHC-I expression in muscle independently of its immune functions. HT transgenic mice that conditionally overexpress H-2K(b) in muscle were bred to an immunodeficient Rag2(-/-) background. The muscle proteome was analyzed by label-free high-resolution protein quantitation and Western blot. Despite the absence of adaptive immunity, HT Rag2(-/-) mice developed a very severe myopathy associated with the cytoplasmic accumulation of H-2K(b) molecules. The UPR was manifest by up-regulation of characteristic proteins. In humans, we found that HLA class I molecules not only were expressed at the sarcolemma but also could accumulate intracellularly in some patients with inclusion body myositis. Accordingly, the UPR was triggered as a function of the degree of HLA accumulation in myofibers. Hence, reexpression of MHC-I in normally negative myofibers exerts pathogenic effects independently of its immune function.
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6
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Soejima M, Kang EH, Gu X, Katsumata Y, Clemens PR, Ascherman DP. Role of innate immunity in a murine model of histidyl-transfer RNA synthetase (Jo-1)-mediated myositis. ACTA ACUST UNITED AC 2011; 63:479-87. [PMID: 21280002 DOI: 10.1002/art.30113] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
OBJECTIVE Previous studies in humans and in animal models support a key role of histidyl-transfer RNA synthetase (HisRS; also known as Jo-1) in the pathogenesis of idiopathic inflammatory myopathy. While most investigations have focused on the ability of HisRS to trigger adaptive immune responses, in vitro studies clearly indicate that HisRS possesses intrinsic chemokine-like properties capable of activating the innate immune system. The purpose of this study was therefore to examine the ability of HisRS to direct innate immune responses in a murine model of myositis. METHODS Following intramuscular immunization with soluble HisRS in the absence of exogenous adjuvant, selected strains of mice were evaluated at different time points for histopathologic evidence of myositis. Enzyme-linked immunosorbent assay-based assessment of autoantibody formation and carboxyfluorescein succinimidyl ester proliferation studies provided complementary measures of B cell and T cell responses triggered by HisRS immunization. RESULTS Compared to appropriate control proteins, a murine HisRS fusion protein induced robust, statistically significant muscle inflammation in multiple congenic strains of C57BL/6 and NOD mice. Time course experiments revealed that this inflammatory response occurred as early as 7 days postimmunization and persisted for up to 7 weeks. Parallel immunization strategies in DO11.10/RAG-2(-/-) and C3H/HeJ (TLR-4(-/-) ) mice indicated that the ability of murine HisRS to drive muscle inflammation was not dependent on B cell receptor or T cell receptor recognition and did not require Toll-like receptor 4 signaling. CONCLUSION Collectively, the findings of these experiments support a model in which HisRS can trigger both innate and adaptive immune responses that culminate in severe muscle inflammation that is the hallmark of idiopathic inflammatory myopathy.
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Affiliation(s)
- Makoto Soejima
- University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15261, USA
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7
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Rayavarapu S, Van der meulen JH, Gordish-Dressman H, Hoffman EP, Nagaraju K, Knoblach SM. Characterization of dysferlin deficient SJL/J mice to assess preclinical drug efficacy: fasudil exacerbates muscle disease phenotype. PLoS One 2010; 5:e12981. [PMID: 20886045 PMCID: PMC2945315 DOI: 10.1371/journal.pone.0012981] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2010] [Accepted: 08/31/2010] [Indexed: 12/21/2022] Open
Abstract
The dysferlin deficient SJL/J mouse strain is commonly used to study dysferlin deficient myopathies. Therefore, we systematically evaluated behavior in relatively young (9-25 weeks) SJL/J mice and compared them to C57BL6 mice to determine which functional end points may be the most effective to use for preclinical studies in the SJL/J strain. SJL/J mice had reduced body weight, lower open field scores, higher creatine kinase levels, and less muscle force than did C57BL6 mice. Power calculations for expected effect sizes indicated that grip strength normalized to body weight and open field activity were the most sensitive indicators of functional status in SJL/J mice. Weight and open field scores of SJL/J mice deteriorated over the course of the study, indicating that progressive myopathy was ongoing even in relatively young (<6 months old) SJL/J mice. To further characterize SJL/J mice within the context of treatment, we assessed the effect of fasudil, a rho-kinase inhibitor, on disease phenotype. Fasudil was evaluated based on previous observations that Rho signaling may be overly activated as part of the inflammatory cascade in SJL/J mice. Fasudil treated SJL/J mice showed increased body weight, but decreased grip strength, horizontal activity, and soleus muscle force, compared to untreated SJL/J controls. Fasudil either improved or had no effect on these outcomes in C57BL6 mice. Fasudil also reduced the number of infiltrating macrophages/monocytes in SJL/J muscle tissue, but had no effect on muscle fiber degeneration/regeneration. These studies provide a basis for standardization of preclinical drug testing trials in the dysferlin deficient SJL/J mice, and identify measures of functional status that are potentially translatable to clinical trial outcomes. In addition, the data provide pharmacological evidence suggesting that activation of rho-kinase, at least in part, may represent a beneficial compensatory response in dysferlin deficient myopathies.
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Affiliation(s)
- Sree Rayavarapu
- Center for Genetic Medicine Research, Children's National Medical Center, Washington, D.C., United States of America
- Institute of Biomedical Sciences, The George Washington University, Washington, D.C., United States of America
| | - Jack H. Van der meulen
- Center for Genetic Medicine Research, Children's National Medical Center, Washington, D.C., United States of America
| | - Heather Gordish-Dressman
- Center for Genetic Medicine Research, Children's National Medical Center, Washington, D.C., United States of America
| | - Eric P. Hoffman
- Center for Genetic Medicine Research, Children's National Medical Center, Washington, D.C., United States of America
- Department of Integrative Systems Biology, School of Medicine and Health Sciences, The George Washington University, Washington, D.C., United States of America
| | - Kanneboyina Nagaraju
- Center for Genetic Medicine Research, Children's National Medical Center, Washington, D.C., United States of America
- Department of Integrative Systems Biology, School of Medicine and Health Sciences, The George Washington University, Washington, D.C., United States of America
- * E-mail: (KN); (SMK)
| | - Susan M. Knoblach
- Center for Genetic Medicine Research, Children's National Medical Center, Washington, D.C., United States of America
- Department of Integrative Systems Biology, School of Medicine and Health Sciences, The George Washington University, Washington, D.C., United States of America
- * E-mail: (KN); (SMK)
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Allenbach Y, Solly S, Grégoire S, Dubourg O, Salomon B, Butler-Browne G, Musset L, Herson S, Klatzmann D, Benveniste O. Role of regulatory T cells in a new mouse model of experimental autoimmune myositis. THE AMERICAN JOURNAL OF PATHOLOGY 2009; 174:989-98. [PMID: 19218348 DOI: 10.2353/ajpath.2009.080422] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Polymyositis is a rare and severe inflammatory muscle disorder. Treatments are partially efficacious but have many side effects. New therapeutic approaches must be first tested in a relevant animal model. Regulatory CD4+CD25+ T cells (Tregs) have been rediscovered as a pivotal cell population in the control of autoimmunity, but the connection between polymyositis and Tregs is currently unknown. To develop a reproducible experimental autoimmune myositis model of polymyositis, mice were immunized once a week for 3 weeks with 1 mg of partially purified myosin emulsified in complete Freund's adjuvant. All mice injected with myosin and complete Freund's adjuvant developed myositis. The infiltrates were composed of CD4(+) and CD8(+) cells, as well as macrophages, but did not contain B lymphocytes. In mice that were depleted of Tregs, the myositis was more severe, as determined by quantitative scoring of muscle inflammation (2.36 +/- 0.9 vs. 1.64 +/- 0.8, P = 0.019). In contrast, injection of in vitro expanded polyclonal Tregs at the time of immunization significantly improved the disease (quantitative score of inflammation 0.87 +/- 1.06 vs. 2.4 +/- 0.67, P = 0.047). Transfer of sensitized or CD4(+)-sorted cells from the lymph nodes of experimental autoimmune myositis mice induced myositis in naïve, irradiated, recipient mice. Thus, experimental autoimmune myositis is a reproducible, transferable disease in mice, both aggravated by Treg depletion and improved by polyclonal Treg injection.
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Affiliation(s)
- Yves Allenbach
- UMR 7087, Université Pierre et Marie Curie, University of Paris 06, Paris, France
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10
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Katsumata Y, Ridgway WM, Oriss T, Gu X, Chin D, Wu Y, Fertig N, Oury T, Vandersteen D, Clemens P, Camacho CJ, Weinberg A, Ascherman DP. Species-specific immune responses generated by histidyl-tRNA synthetase immunization are associated with muscle and lung inflammation. J Autoimmun 2007; 29:174-86. [PMID: 17826948 PMCID: PMC2639656 DOI: 10.1016/j.jaut.2007.07.005] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2007] [Revised: 07/23/2007] [Accepted: 07/23/2007] [Indexed: 01/02/2023]
Abstract
Evidence implicating histidyl-tRNA synthetase (Jo-1) in the pathogenesis of the anti-synthetase syndrome includes established genetic associations linking the reproducible phenotype of muscle inflammation and interstitial lung disease with autoantibodies recognizing Jo-1. To better address the role of Jo-1-directed B and T cell responses in the context of different genetic backgrounds, we employed Jo-1 protein immunization of C57BL/6 and NOD congenic mice. Detailed analysis of early antibody responses following inoculation with human or murine Jo-1 demonstrates remarkable species-specifity, with limited cross recognition of Jo-1 from the opposite species. Complementing these results, immunization with purified peptides derived from murine Jo-1 generates B and T cells targeting species-specific epitopes contained within the amino terminal 120 amino acids of murine Jo-1. The eventual spreading of B cell epitopes that uniformly occurs 8 weeks post immunization with murine Jo-1 provides additional evidence of an immune response mediated by autoreactive, Jo-1-specific T cells. Corresponding to this self-reactivity, mice immunized with murine Jo-1 develop a striking combination of muscle and lung inflammation that replicates features of the human anti-synthetase syndrome.
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Affiliation(s)
- Yasuhiro Katsumata
- Department of Medicine, Division of Rheumatology and Immunology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
| | - William M. Ridgway
- Department of Medicine, Division of Rheumatology and Immunology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
| | - Timothy Oriss
- Department of Medicine, Division of Pulmonary, Allergy, and Critical Care Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213, USA
| | - Xinyan Gu
- Department of Medicine, Division of Rheumatology and Immunology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
| | - David Chin
- Department of Medicine, Division of Rheumatology and Immunology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
| | - Yuehong Wu
- Department of Medicine, Division of Rheumatology and Immunology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
| | - Noreen Fertig
- Department of Medicine, Division of Rheumatology and Immunology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
| | - Tim Oury
- Department of Pathology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
| | - Daniel Vandersteen
- Department of Pathology, St. Mary's/Duluth Clinic Health System, Duluth, MN 55805, USA
| | - Paula Clemens
- Department of Neurology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
| | - Carlos J. Camacho
- Department of Computational Biology, University of Pittsburgh, Pittsburgh, PA 15261, USA
| | - Andrew Weinberg
- Department of Basic Immunology, Earle A. Chiles Research Institute, Providence Portland Medical Center, Portland, OR 97213, USA
| | - Dana P. Ascherman
- Department of Medicine, Division of Rheumatology and Immunology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
- Corresponding author. Department of Medicine, Division of Rheumatology and Immunology, University of Pittsburgh School of Medicine, BST S707, 3500 Terrace Street, Pittsburgh, PA 15261, USA. Tel.: +1 412 383 8734; fax: +1 412 383 8864. E-mail address: (D.P. Ascherman)
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Shelton GD, Hoffman EP, Ghimbovschi S, Peters IR, Day MJ, Mullins M, Moore PF, Nagaraju K. Immunopathogenic pathways in canine inflammatory myopathies resemble human myositis. Vet Immunol Immunopathol 2006; 113:200-14. [PMID: 16797723 DOI: 10.1016/j.vetimm.2006.05.005] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2006] [Accepted: 05/08/2006] [Indexed: 11/20/2022]
Abstract
Progress in the treatment of inflammatory myopathies is impeded by the lack of suitable animal models. Inflammatory myopathies occur spontaneously in the dog, are a heterogeneous group of disorders, and are more common than in humans. Clinical signs of weakness and muscle atrophy are reliably present, and there are histological and immunohistological similarities to forms of human myositis. In this study, microarray technology followed by quantitative real-time PCR and immunohistochemistry on muscle biopsy sections was used to investigate gene expression in cases of canine inflammatory myopathies. Several genes involved with innate and adaptive immunity were highly upregulated including those that participate in macrophage and dendritic cell activation and migration, and antigen processing and presentation. Other genes including those that participate in B cell growth, development, migration and activation, immunoglobulin genes, genes in pro-inflammatory and anti-inflammatory pathways, and genes involved with tissue remodeling were upregulated. In previous reports utilizing microarray technology in human myositis, there was activation of similar pathways involved in the immune response. This study strengthens the argument that forms of canine myositis may be important animal models of human myositis and suggests useful biomarkers for therapeutic response using the dog in pre-clinical trials.
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Affiliation(s)
- G Diane Shelton
- Department of Pathology, University of California, San Diego, La Jolla, CA 92093-0709, USA.
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Sarkar K, Weinberg CR, Oddis CV, Medsger TA, Plotz PH, Reveille JD, Arnett FC, Targoff IN, Genth E, Love LA, Miller FW. Seasonal influence on the onset of idiopathic inflammatory myopathies in serologically defined groups. ACTA ACUST UNITED AC 2005; 52:2433-8. [PMID: 16052581 DOI: 10.1002/art.21198] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
OBJECTIVE To assess possible seasonal patterns in the onset of polymyositis (PM) and dermatomyositis (DM). METHODS The study group comprised 503 patients who met the criteria for probable or definite PM or DM and for whom detailed data on the time of myositis onset were available. Statistical analyses were performed using a Poisson model that assessed associations of ethnicity, sex, autoantibody presence, and month of onset of muscle weakness. RESULTS There were no significant seasonal patterns of disease onset in myositis patients as a whole or in the total PM or DM populations. Significant seasonal associations were present, however, in the serologically defined groups. In the 131 patients with antisynthetase autoantibodies who were categorized as non-black, myositis onset peaked in March-April (P = 0.03). Among the antisynthetase-positive patients, the association was predominantly in those with PM (n = 85; P = 0.05) and in men (n = 51; P = 0.042). Patients with anti-signal recognition particle autoantibodies, however, did not have a significant seasonal onset, which is in contrast to previous findings. Patients without myositis-specific autoantibodies showed a significant peak in summer, with myositis onset in June-July (n = 252; P = 0.03); this seasonal association was significant in women (n = 182; P = 0.005), whereas there was no seasonal pattern in men (P = 0.9). CONCLUSION These findings, in conjunction with other data, suggest that diverse environmental agents, acting upon different immunogenetic backgrounds, result in distinct immune responses and clinical syndromes in the idiopathic inflammatory myopathies. Our results emphasize the importance of considering more homogeneous disease groups, based on clinicopathologic features, immune responses, ethnicity, and sex, when attempting to decipher the pathogeneses of autoimmune disorders.
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Affiliation(s)
- Kakali Sarkar
- National Institute of Environmental Health Sciences, NIH, DHHS, Bethesda, MD 20892, USA.
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