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Senécal JL, Hoa S, Yang R, Koenig M. Pathogenic roles of autoantibodies in systemic sclerosis: Current understandings in pathogenesis. JOURNAL OF SCLERODERMA AND RELATED DISORDERS 2020; 5:103-129. [PMID: 35382028 PMCID: PMC8922609 DOI: 10.1177/2397198319870667] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2019] [Accepted: 07/29/2019] [Indexed: 09/12/2023]
Abstract
The potential pathogenic role for autoantibodies in systemic sclerosis has captivated researchers for the past 40 years. This review answers the question whether there is yet sufficient knowledge to conclude that certain serum autoantibodies associated with systemic sclerosis contribute to its pathogenesis. Definitions for pathogenic, pathogenetic and functional autoantibodies are formulated, and the need to differentiate these autoantibodies from natural autoantibodies is emphasized. In addition, seven criteria for the identification of pathogenic autoantibodies are proposed. Experimental evidence is reviewed relevant to the classic systemic sclerosis antinuclear autoantibodies, anti-topoisomerase I and anticentromere, and to functional autoantibodies to endothelin 1 type A receptor, angiotensin II type 1 receptor, muscarinic receptor 3, platelet-derived growth factor receptor, chemokine receptors CXCR3 and CXCR4, estrogen receptor α, and CD22. Pathogenic evidence is also reviewed for anti-matrix metalloproteinases 1 and 3, anti-fibrillin 1, anti-IFI16, anti-eIF2B, anti-ICAM-1, and anti-RuvBL1/RuvBL2 autoantibodies. For each autoantibody, objective evidence for a pathogenic role is scored qualitatively according to the seven pathogenicity criteria. It is concluded that anti-topoisomerase I is the single autoantibody specificity with the most evidence in favor of a pathogenic role in systemic sclerosis, followed by anticentromere. However, these autoantibodies have not been demonstrated yet to fulfill completely the seven proposed criteria for pathogenicity. Their contributory roles to the pathogenesis of systemic sclerosis remain possible but not yet conclusively demonstrated. With respect to functional autoantibodies and other autoantibodies, only a few criteria for pathogenicity are fulfilled. Their common presence in healthy and disease controls suggests that major subsets of these immunoglobulins are natural autoantibodies. While some of these autoantibodies may be pathogenetic in systemic sclerosis, establishing that they are truly pathogenic is a work in progress. Experimental data are difficult to interpret because high serum autoantibody levels may be due to polyclonal B-cell activation. Other limitations in experimental design are the use of total serum immunoglobulin G rather than affinity-purified autoantibodies, the confounding effect of other systemic sclerosis autoantibodies present in total immunoglobulin G and the lack of longitudinal studies to determine if autoantibody titers fluctuate with systemic sclerosis activity and severity. These intriguing new specificities expand the spectrum of autoantibodies observed in systemic sclerosis. Continuing elucidation of their potential mechanistic roles raises hope of a better understanding of systemic sclerosis pathogenesis leading to improved therapies.
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Affiliation(s)
- Jean-Luc Senécal
- Scleroderma Research Chair, Université de Montréal, Montreal, QC, Canada
- Division of Rheumatology, Centre hospitalier de l’Université de Montréal, Montreal, QC, Canada
- Autoimmunity Research Laboratory, Research Centre of the Centre hospitalier de l’Université de Montréal, Montreal, QC, Canada
| | - Sabrina Hoa
- Division of Rheumatology, Centre hospitalier de l’Université de Montréal, Montreal, QC, Canada
- Autoimmunity Research Laboratory, Research Centre of the Centre hospitalier de l’Université de Montréal, Montreal, QC, Canada
| | - Roger Yang
- Division of Rheumatology, Centre hospitalier de l’Université de Montréal, Montreal, QC, Canada
| | - Martial Koenig
- Autoimmunity Research Laboratory, Research Centre of the Centre hospitalier de l’Université de Montréal, Montreal, QC, Canada
- Division of Internal Medicine, Centre hospitalier de l’Université de Montréal, Montreal, QC, Canada
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Brown M, O'Reilly S. The immunopathogenesis of fibrosis in systemic sclerosis. Clin Exp Immunol 2018; 195:310-321. [PMID: 30430560 DOI: 10.1111/cei.13238] [Citation(s) in RCA: 101] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/07/2018] [Indexed: 02/07/2023] Open
Abstract
Systemic sclerosis (SSc) is an idiopathic systemic autoimmune disease. It is characterized by a triad of hallmarks: immune dysfunction, fibrosis and vasculopathy. Immune dysfunction in SSc is characterized by the activation and recruitment of immune cells and the production of autoantibodies and cytokines. How immune abnormalities link the fibrosis and vasculopathy in SSc is poorly understood. A plethora of immune cell types are implicated in the immunopathogenesis of SSc, including T cells, B cells, dendritic cells, mast cells and macrophages. How these different cell types interact to contribute to SSc is complicated, and can involve cell-to-cell interactions and communication via cytokines, including transforming growth factor (TGF)-β, interleukin (IL)-6 and IL-4. We will attempt to review significant and recent research demonstrating the importance of immune cell regulation in the immunopathogenesis of SSc with a particular focus on fibrosis.
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Affiliation(s)
- M Brown
- Faculty of Health and Life Sciences, Northumbria University, Newcastle upon Tyne, UK
| | - S O'Reilly
- Faculty of Health and Life Sciences, Northumbria University, Newcastle upon Tyne, UK
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Yue X, Yu X, Petersen F, Riemekasten G. Recent advances in mouse models for systemic sclerosis. Autoimmun Rev 2018; 17:1225-1234. [PMID: 30316997 DOI: 10.1016/j.autrev.2018.06.013] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Accepted: 06/30/2018] [Indexed: 12/13/2022]
Abstract
SSc is a complex rheumatoid disease characterized by autoimmunity, fibrosis and vasculopathy. Mouse models provide powerful research tools for exploring the pathogenesis of the human diseases. Each mouse model can represent a specific way leading to the development of disease. Moreover, mouse models can be used to investigate the role of candidate molecule in the pathogenesis of disease. So far, more than twenty mouse models for SSc have been established and provide new insights in the understanding of the pathogenesis of SSc. In this review, we provide an overview on recent advances in the field of experimental SSc. We introduce novel mouse models generated in the recent years and discuss their relevance to the SSc pathogenesis. Moreover, we summarize and discuss recent findings in the pathogenesis of classical SSc mouse models.
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Affiliation(s)
- Xiaoyang Yue
- Priority Area Asthma & Allergy, Research Center Borstel, 23845 Borstel, Germany; Airway Research Center North (ARCN), Members of the German Center for Lung Research (DZL), Germany
| | - Xinhua Yu
- Priority Area Asthma & Allergy, Research Center Borstel, 23845 Borstel, Germany; Airway Research Center North (ARCN), Members of the German Center for Lung Research (DZL), Germany
| | - Frank Petersen
- Priority Area Asthma & Allergy, Research Center Borstel, 23845 Borstel, Germany; Airway Research Center North (ARCN), Members of the German Center for Lung Research (DZL), Germany
| | - Gabriela Riemekasten
- Airway Research Center North (ARCN), Members of the German Center for Lung Research (DZL), Germany; Department of Rheumatology, University of Lübeck, 23538 Lübeck, Germany.
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Affandi AJ, Carvalheiro T, Radstake TRDJ, Marut W. Dendritic cells in systemic sclerosis: Advances from human and mice studies. Immunol Lett 2017; 195:18-29. [PMID: 29126878 DOI: 10.1016/j.imlet.2017.11.003] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2017] [Revised: 11/05/2017] [Accepted: 11/06/2017] [Indexed: 12/20/2022]
Abstract
Systemic sclerosis (SSc) is a complex heterogeneous fibrotic autoimmune disease with an unknown exact etiology, and characterized by three hallmarks: fibrosis, vasculopathy, and immune dysfunction. Dendritic cells (DCs) are specialized cells in pathogen sensing with high potency of antigen presentation and capable of releasing mediators to shape the immune response. Altered DCs distributions and their impaired functions may account for their role in breaking the immune tolerance and driving inflammation in SSc, and the direct contribution of DCs in promoting endothelial dysfunction and fibrotic process has only begun to be understood. Plasmacytoid dendritic cells in particular have been implicated due to their high production of type I interferon as well as other cytokines and chemokines, including the pro-inflammatory and anti-angiogenic CXCL4. Furthermore, a deeper understanding of human and mouse DC biology has clarified their identification and function in different tissues, and novel DC subsets have only recently been discovered. In this review, we highlight key findings and recent advances exploring DC role in the pathogenesis of SSc and other related autoimmune diseases, and consideration of their potential use as targeted therapy in SSc.
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Affiliation(s)
- Alsya J Affandi
- Laboratory of Translational Immunology, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands; Department of Rheumatology and Clinical Immunology, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands
| | - Tiago Carvalheiro
- Laboratory of Translational Immunology, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands; Department of Rheumatology and Clinical Immunology, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands
| | - Timothy R D J Radstake
- Laboratory of Translational Immunology, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands; Department of Rheumatology and Clinical Immunology, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands
| | - Wioleta Marut
- Laboratory of Translational Immunology, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands; Department of Rheumatology and Clinical Immunology, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands.
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5
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Zheng J, Huang Q, Huang R, Deng F, Yue X, Yin J, Zhao W, Chen Y, Wen L, Zhou J, Huang R, Riemekasten G, Liu Z, Petersen F, Yu X. B Cells Are Indispensable for a Novel Mouse Model of Primary Sjögren's Syndrome. Front Immunol 2017; 8:1384. [PMID: 29118759 PMCID: PMC5661054 DOI: 10.3389/fimmu.2017.01384] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2017] [Accepted: 10/06/2017] [Indexed: 01/10/2023] Open
Abstract
Primary Sjögren's syndrome (pSS) is characterized by a panel of autoantibodies, while it is not clear whether B cells and autoantibodies play an essential role in pathogenesis of the disease. Here, we report a novel mouse model for pSS which is induced by immunization with the Ro60_316-335 peptide containing a predominant T cell epitope. After immunization, mice developed several symptoms mimicking pSS, including a decreased secretion of tears, lymphocytic infiltration into the lacrimal glands, autoantibodies, and increased levels of inflammatory cytokines. Disease susceptibility to this novel mouse model varies among strains, where C3H/HeJ (H2-k) and C3H/HeN (H2-k) are susceptible while DBA/1 (H2-q) and C57BL/6 (H2-b) are resistant. Depletion of B cells using anti-CD20 monoclonal antibodies prevented C3H/HeN mice from development of the pSS-like disease. In addition, HLA-DRB1*0803, a pSS risk allele, was predicted to bind to the hRo60_308-328 which contains a predominant T cell epitope of human Ro60. Therefore, this study provides a novel mouse model for pSS and reveals an indispensable role of B cells in this model. Moreover, it suggests that T cell epitope within Ro60 antigen is potentially pathogenic for pSS.
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Affiliation(s)
- Junfeng Zheng
- Xiamen-Borstel Joint Laboratory of Autoimmunity, Medical College of Xiamen University, Xiamen, China.,Institute of Psychiatry and Neuroscience, Xinxiang Medical University, XinXiang, China
| | - Qiaoniang Huang
- Xiamen-Borstel Joint Laboratory of Autoimmunity, Medical College of Xiamen University, Xiamen, China
| | - Renliang Huang
- Xiamen-Borstel Joint Laboratory of Autoimmunity, Medical College of Xiamen University, Xiamen, China
| | - Fengyuan Deng
- Xiamen-Borstel Joint Laboratory of Autoimmunity, Medical College of Xiamen University, Xiamen, China
| | - Xiaoyang Yue
- Priority Area Asthma & Allergy, Research Center Borstel, Airway Research Center North (ARCN), Members of the German Center for Lung Research (DZL), Borstel, Germany
| | - Junping Yin
- Xiamen-Borstel Joint Laboratory of Autoimmunity, Medical College of Xiamen University, Xiamen, China
| | - Wenjie Zhao
- Xiamen-Borstel Joint Laboratory of Autoimmunity, Medical College of Xiamen University, Xiamen, China
| | - Yan Chen
- Xiamen-Borstel Joint Laboratory of Autoimmunity, Medical College of Xiamen University, Xiamen, China
| | - Lifang Wen
- Xiamen-Borstel Joint Laboratory of Autoimmunity, Medical College of Xiamen University, Xiamen, China
| | - Jun Zhou
- Xiamen-Borstel Joint Laboratory of Autoimmunity, Medical College of Xiamen University, Xiamen, China
| | - Renda Huang
- Xiamen-Borstel Joint Laboratory of Autoimmunity, Medical College of Xiamen University, Xiamen, China
| | - Gabriela Riemekasten
- Institute of Psychiatry and Neuroscience, Xinxiang Medical University, XinXiang, China.,Department of Rheumatology, University of Lübeck, Lübeck, Germany
| | - Zuguo Liu
- Eye Institute of Xiamen University, The Medical College of Xiamen University, Xiamen, China
| | - Frank Petersen
- Priority Area Asthma & Allergy, Research Center Borstel, Airway Research Center North (ARCN), Members of the German Center for Lung Research (DZL), Borstel, Germany
| | - Xinhua Yu
- Xiamen-Borstel Joint Laboratory of Autoimmunity, Medical College of Xiamen University, Xiamen, China.,Priority Area Asthma & Allergy, Research Center Borstel, Airway Research Center North (ARCN), Members of the German Center for Lung Research (DZL), Borstel, Germany
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Mehta H, Goulet PO, Nguyen V, Pérez G, Koenig M, Senécal JL, Sarfati M. Topoisomerase I peptide-loaded dendritic cells induce autoantibody response as well as skin and lung fibrosis. Autoimmunity 2016; 49:503-513. [DOI: 10.1080/08916934.2016.1230848] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
| | | | | | - Gemma Pérez
- Laboratory for Research in Autoimmunity, Center de Recherche du Center Hospitalier de l’Université de Montréal (CRCHUM), Montréal, Québec, Canada
| | - Martial Koenig
- Laboratory for Research in Autoimmunity, Center de Recherche du Center Hospitalier de l’Université de Montréal (CRCHUM), Montréal, Québec, Canada
| | - Jean-Luc Senécal
- Laboratory for Research in Autoimmunity, Center de Recherche du Center Hospitalier de l’Université de Montréal (CRCHUM), Montréal, Québec, Canada
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The role of the acquired immune response in systemic sclerosis. Semin Immunopathol 2015; 37:519-28. [PMID: 26152639 DOI: 10.1007/s00281-015-0509-1] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2015] [Accepted: 06/16/2015] [Indexed: 12/24/2022]
Abstract
Profound alterations characterize the adaptive immune response in systemic sclerosis, and several layers of evidence support a prominent role exerted by immune cellular effectors and humoral mediators in the pathogenesis of this disease. These include (i) the presence of oligoclonal T cells in tissues undergoing fibrosis consistent with (auto)antigen-specific recruitment, (ii) the preferential expansion of polarized CD4+ and CD8+ T cells producing pro-fibrotic cytokines such as IL-4 and IL-13, (iii) the presence of increased number of cells producing mediators belonging to the IL-17 family, including IL-22, which may drive and participate in inflammatory pathways involving epithelial cells as well as fibroblasts, (iv) the deficient or redirected function of T regulatory cells favoring fibrosis, and (v) the enhanced expression of CD19 and CD21 on naïve B cells, and the upregulation of co-stimulatory molecules in mature B cells, which together with the increased levels of B cell activating factor (BAFF) underlie the propensity to an exaggerated humoral response possibly favoring fibrogenesis. Despite all the progress made in understanding the features of the aberrant immune response in scleroderma, it remains unclear whether the activation of immune effector pathways ultimately drives the disease pathogenesis or rather represents a defective attempt to limit or even reverse excessive extracellular matrix deposition and progressive vasculopathy, the main hallmarks of this disease.
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Hoffmann MH, Trembleau S, Muller S, Steiner G. Nucleic acid-associated autoantigens: pathogenic involvement and therapeutic potential. J Autoimmun 2009; 34:J178-206. [PMID: 20031372 DOI: 10.1016/j.jaut.2009.11.013] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Autoimmunity to ubiquitously expressed macromolecular nucleic acid-protein complexes such as the nucleosome or the spliceosome is a characteristic feature of systemic autoimmune diseases. Disease-specificity and/or association with clinical features of some of these autoimmune responses suggest pathogenic involvement which, however, has been proven in only a few cases so far. Although the mechanisms leading to autoimmunity against nucleic acid-containing complexes are still far from being fully understood, there is increasing experimental evidence that the nucleic acid component may act as a co-stimulator or adjuvans via activation of nucleic acid-binding receptor systems such as Toll-like receptors in antigen-presenting cells. Dysregulated apoptosis and inappropriate stimulation of nucleic acid-sensing receptors may lead to loss of tolerance against the protein components of such complexes, activation of autoreactive T cells and formation of autoantibodies. This has been demonstrated to occur in systemic lupus erythematosus and seems to represent a general mechanism that may be crucial for the development of systemic autoimmune diseases. This review provides a comprehensive overview of the most thoroughly-characterized nucleic acid-associated autoantigens, describing their structure and biological function, as well as the nature and pathogenic importance of the reactivities directed against them. Furthermore, recent advances in immunotherapy such as antigen-specific approaches targeted at nucleic acid-binding antigens are discussed.
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Affiliation(s)
- Markus H Hoffmann
- Division of Rheumatology, Internal Medicine III, Medical University of Vienna, Waehringer Guertel 18-20, A-1090 Vienna, Austria
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Slobodin G, Pavlotzky E, Panov J, Rosner I, Kessel A, Toubi E. Endothelin-1 Does Not Change the Function of Monocyte-Derived Dendritic Cells Grown from Patients with Systemic Sclerosis. Immunol Invest 2009; 37:841-8. [DOI: 10.1080/08820130802438016] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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10
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Pacheco FJ, Servin J, Dang D, Kim J, Molinaro C, Daniels T, Brown-Bryan TA, Imoto-Egami M, Casiano CA. Involvement of lysosomal cathepsins in the cleavage of DNA topoisomerase I during necrotic cell death. ACTA ACUST UNITED AC 2005; 52:2133-45. [PMID: 15986368 DOI: 10.1002/art.21147] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
OBJECTIVE Autoantibodies to DNA topoisomerase I (topo I) are associated with diffuse systemic sclerosis (SSc), appear to be antigen driven, and may be triggered by cryptic epitopes exposed during in vivo topo I fragmentation. These autoantibodies recognize topo I and fragments of this autoantigen generated during apoptosis and necrosis. We undertook this study to determine whether lysosomal cathepsins are involved in topo I fragmentation during necrosis. METHODS Topo I cleavage during necrosis was assessed by immunoblotting of lysates from L929 fibroblasts exposed to tumor necrosis factor alpha (TNFalpha) and the broad caspase inhibitor Z-VAD-FMK, and by immunoblotting of lysates from endothelial cells treated with HgCl2. Purified topo I and L929 nuclei were incubated with cathepsins B, D, G, H, and L, and topo I cleavage was detected by immunoblotting. The intracellular localization of cathepsin L activity and topo I in necrotic cells was examined using fluorescence microscopy. RESULTS Treatment of L929 cells with TNFalpha and Z-VAD-FMK induced caspase-independent cell death with necrotic morphology. This cell death involved topo I cleavage into fragments of approximately 70 kd and 45 kd. This cleavage profile was reproduced in vitro by cathepsins L and H and was inhibited by the cathepsin L inhibitor Z-FY-CHO. During necrosis, cathepsin L activity diffused from lysosomes into the cytoplasm and nucleus, whereas topo I partially relocalized to the cytoplasm. Z-FY-CHO delayed necrosis and partially blocked topo I cleavage. The topo I cleavage fragments were also detected in necrotic endothelial cells and recognized by SSc sera containing anti-topo I antibodies. CONCLUSION These results implicate cathepsins, particularly cathepsin L, in the cleavage of topo I during necrosis. This cleavage may generate potentially immunogenic fragments that could trigger anti-topo I immune responses in SSc.
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Affiliation(s)
- Fabio J Pacheco
- Loma Linda University School of Medicine, Loma Linda, California 92350, USA
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Veeraraghavan S, Renzoni EA, Jeal H, Jones M, Hammer J, Wells AU, Black CM, Welsh KI, du Bois RM. Mapping of the immunodominant T cell epitopes of the protein topoisomerase I. Ann Rheum Dis 2004; 63:982-7. [PMID: 15249326 PMCID: PMC1755092 DOI: 10.1136/ard.2003.008037] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
OBJECTIVES To identify the immunodominant T cell epitopes of the topoisomerase I protein in patients with systemic sclerosis (SSc) and control subjects, using computational analysis software (TEPITOPE) and T cell proliferation assays. METHODS Six oligopeptides, predicted by TEPITOPE software as potential topoisomerase protein epitopes, were used to perform T cell proliferation assays in 21 patients with SSc and 15 healthy controls. RESULTS A positive response to at least one of the peptides was seen in 10/21 patients and 7/15 healthy controls. Among responders, the proliferative response was limited to a single peptide in 6/7 healthy controls, whereas 5/10 patients responded to more than one peptide. In responding patients a significant correlation was found between disease duration and number of peptides inducing a response (p = 0.007). CONCLUSIONS Several T cell epitopes of the topoisomerase I protein have been identified and evidence has been found to suggest epitope spreading in patients with SSc.
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Affiliation(s)
- S Veeraraghavan
- Department of Occupational Medicine, National Heart and Lung Institute, Royal Brompton Hospital and Imperial College of Science Technology and Medicine, London, UK
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Ascherman DP, Oriss TB, Oddis CV, Wright TM. Critical requirement for professional APCs in eliciting T cell responses to novel fragments of histidyl-tRNA synthetase (Jo-1) in Jo-1 antibody-positive polymyositis. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2002; 169:7127-34. [PMID: 12471150 DOI: 10.4049/jimmunol.169.12.7127] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Polymyositis (PM) is an autoimmune muscle disease characterized by oligoclonal T cell infiltrates mediating myocytotoxicity. Although antigenic triggers for this process remain undefined, clinically homogeneous subsets of PM patients are characterized by autoantibodies directed against nuclear and cytoplasmic Ags that include histidyl-tRNA synthetase (Jo-1). Available evidence suggests that formation of anti-Jo-1 autoantibodies is Ag-driven and therefore dependent on CD4(+) T cells that may also direct cytolytic CD8(+) T cells involved in myocyte destruction. To assess peripheral blood T cell responses to Jo-1, we first subcloned full-length human Jo-1 as well as novel fragments of Jo-1 into the maltose-binding protein expression vector pMALc2. Expressed proteins were then used in standard proliferation assays with either PBMC or autologous DCs as sources of APCs. Although PBMC-derived APCs and DCs both supported peripheral blood T cell proliferation when primed with full-length human Jo-1, only DCs promoted proliferative responses to a unique amino-terminal fragment of Jo-1. mAb blockade of different HLA Ags revealed that these responses were MHC class II dependent. Therefore, for the first time, these studies demonstrate anti-Jo-1 T cell responses in Jo-1 Ab-positive PM patients as well as in healthy control subjects. More importantly, this work underscores the critical importance of APC type in dictating T cell responses to a novel antigenic fragment of Jo-1.
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Affiliation(s)
- Dana P Ascherman
- Division of Rheumatology and Clinical Immunology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA.
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Pollard KM. Cell death, autoantigen cleavage, and autoimmunity. ARTHRITIS AND RHEUMATISM 2002; 46:1699-702. [PMID: 12124851 DOI: 10.1002/art.10415] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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14
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Nozawa K, Casiano CA, Hamel JC, Molinaro C, Fritzler MJ, Chan EKL. Fragmentation of Golgi complex and Golgi autoantigens during apoptosis and necrosis. ARTHRITIS RESEARCH 2002; 4:R3. [PMID: 12106502 PMCID: PMC125295 DOI: 10.1186/ar422] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/11/2002] [Revised: 05/10/2002] [Accepted: 05/10/2002] [Indexed: 11/10/2022]
Abstract
Anti-Golgi complex autoantibodies are found primarily in patients with Sjögren's syndrome and systemic lupus erythematosus, although they are not restricted to these diseases. Several Golgi autoantigens have been identified that represent a small family of proteins. Common features of all Golgi autoantigens appear to be their distinct structural organization of multiple alpha-helical coiled-coil rods in the central domains flanked by non-coiled-coil N-termini and C-termini, and their localization to the cytoplasmic face of Golgi cisternae. Many autoantigens in systemic autoimmune diseases have distinct cleavage products in apoptosis or necrosis and this has raised the possibility that cell death may play a role in the generation of potentially immunostimulatory forms of autoantigens. In the present study, we examined changes in the Golgi complex and associated autoantigens during apoptosis and necrosis. Immunofluorescence analysis showed that the Golgi complex was altered and developed distinctive characteristics during apoptosis and necrosis. In addition, immunoblotting analysis showed the generation of antigenic fragments of each Golgi autoantigen, suggesting that they may play a role in sustaining autoantibody production. Further studies are needed to determine whether the differences observed in the Golgi complex during apoptosis or necrosis may account for the production of anti-Golgi complex autoantibodies.
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Affiliation(s)
- Kazuhisa Nozawa
- Department of Molecular and Experimental Medicine, WM Keck Autoimmune Disease Center, The Scripps Research Institute, La Jolla, California, USA
| | - Carlos A Casiano
- Department of Medicine and Department of Biochemistry and Microbiology, Center for Molecular Biology and Gene Therapy, Loma Linda University School of Medicine, Loma Linda, California, USA
| | - John C Hamel
- Department of Molecular and Experimental Medicine, WM Keck Autoimmune Disease Center, The Scripps Research Institute, La Jolla, California, USA
| | - Christine Molinaro
- Department of Medicine and Department of Biochemistry and Microbiology, Center for Molecular Biology and Gene Therapy, Loma Linda University School of Medicine, Loma Linda, California, USA
| | - Marvin J Fritzler
- Department of Medicine and Department of Biochemistry and Molecular Biology, University of Calgary, Calgary, Alberta, Canada
| | - Edward KL Chan
- Department of Molecular and Experimental Medicine, WM Keck Autoimmune Disease Center, The Scripps Research Institute, La Jolla, California, USA
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