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Lao P, Chen J, Tang L, Zhang J, Chen Y, Fang Y, Fan X. Regulatory T cells in lung disease and transplantation. Biosci Rep 2023; 43:BSR20231331. [PMID: 37795866 PMCID: PMC10611924 DOI: 10.1042/bsr20231331] [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: 08/07/2023] [Revised: 09/28/2023] [Accepted: 10/04/2023] [Indexed: 10/06/2023] Open
Abstract
Pulmonary disease can refer to the disease of the lung itself or the pulmonary manifestations of systemic diseases, which are often connected to the malfunction of the immune system. Regulatory T (Treg) cells have been shown to be important in maintaining immune homeostasis and preventing inflammatory damage, including lung diseases. Given the increasing amount of evidence linking Treg cells to various pulmonary conditions, Treg cells might serve as a therapeutic strategy for the treatment of lung diseases and potentially promote lung transplant tolerance. The most potent and well-defined Treg cells are Foxp3-expressing CD4+ Treg cells, which contribute to the prevention of autoimmune lung diseases and the promotion of lung transplant rejection. The protective mechanisms of Treg cells in lung disease and transplantation involve multiple immune suppression mechanisms. This review summarizes the development, phenotype and function of CD4+Foxp3+ Treg cells. Then, we focus on the therapeutic potential of Treg cells in preventing lung disease and limiting lung transplant rejection. Furthermore, we discussed the possibility of Treg cell utilization in clinical applications. This will provide an overview of current research advances in Treg cells and their relevant application in clinics.
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Affiliation(s)
- Peizhen Lao
- Institute of Biological and Food Engineering, Guangdong University of Education, 351 Xingang Middle Road, Guangzhou 510303, PR China
| | - Jingyi Chen
- Institute of Biological and Food Engineering, Guangdong University of Education, 351 Xingang Middle Road, Guangzhou 510303, PR China
| | - Longqian Tang
- Institute of Biological and Food Engineering, Guangdong University of Education, 351 Xingang Middle Road, Guangzhou 510303, PR China
| | - Jiwen Zhang
- Institute of Biological and Food Engineering, Guangdong University of Education, 351 Xingang Middle Road, Guangzhou 510303, PR China
| | - Yuxi Chen
- Institute of Biological and Food Engineering, Guangdong University of Education, 351 Xingang Middle Road, Guangzhou 510303, PR China
| | - Yuyin Fang
- Institute of Biological and Food Engineering, Guangdong University of Education, 351 Xingang Middle Road, Guangzhou 510303, PR China
| | - Xingliang Fan
- Institute of Biological and Food Engineering, Guangdong University of Education, 351 Xingang Middle Road, Guangzhou 510303, PR China
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Chauhan SK, Bartolomé Casado R, Landsverk OJB, Johannessen H, Phung D, Nilsen HR, Sætre F, Jahnsen J, Horneland R, Yaqub S, Aandahl EM, Lundin KEA, Bækkevold ES, Jahnsen FL. Human small intestine contains 2 functionally distinct regulatory T-cell subsets. J Allergy Clin Immunol 2023; 152:278-289.e6. [PMID: 36893861 DOI: 10.1016/j.jaci.2023.02.030] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2022] [Revised: 02/17/2023] [Accepted: 02/23/2023] [Indexed: 03/09/2023]
Abstract
BACKGROUND Regulatory T (Treg) CD4 cells in mouse gut are mainly specific for intestinal antigens and play an important role in the suppression of immune responses against harmless dietary antigens and members of the microbiota. However, information about the phenotype and function of Treg cells in the human gut is limited. OBJECTIVE We performed a detailed characterization of Foxp3+ CD4 Treg cells in human normal small intestine (SI) as well as from transplanted duodenum and celiac disease lesions. METHODS Treg cells and conventional CD4 T cells derived from SI were subjected to extensive immunophenotyping and their suppressive activity and ability to produce cytokines assessed. RESULTS SI Foxp3+ CD4 T cells were CD45RA-CD127-CTLA-4+ and suppressed proliferation of autologous T cells. Approximately 60% of Treg cells expressed the transcription factor Helios. When stimulated, Helios-negative Treg cells produced IL-17, IFN-γ, and IL-10, whereas Helios-positive Treg cells produced very low levels of these cytokines. By sampling mucosal tissue from transplanted human duodenum, we demonstrated that donor Helios-negative Treg cells persisted for at least 1 year after transplantation. In normal SI, Foxp3+ Treg cells constituted only 2% of all CD4 T cells, while in active celiac disease, both Helios-negative and Helios-positive subsets expanded 5- to 10-fold. CONCLUSION The SI contains 2 subsets of Treg cells with different phenotypes and functional capacities. Both subsets are scarce in healthy gut but increase dramatically in active celiac disease.
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Affiliation(s)
- Sudhir Kumar Chauhan
- Department of Pathology, Oslo University Hospital-Rikshospitalet, Oslo, Norway; Department of Cancer Immunology, Institute for Cancer Research, Oslo University Hospital, Oslo, Norway.
| | - Raquel Bartolomé Casado
- Department of Pathology, Oslo University Hospital-Rikshospitalet, Oslo, Norway; Institute of Clinical Medicine, University of Oslo, Oslo, Norway
| | - Ole J B Landsverk
- Department of Pathology, Oslo University Hospital-Rikshospitalet, Oslo, Norway
| | - Hanna Johannessen
- Department of Pathology, Oslo University Hospital-Rikshospitalet, Oslo, Norway; Department of Gastrointestinal and Pediatric Surgery, Oslo University Hospital-Rikshospitalet, Oslo, Norway
| | - Danh Phung
- Department of Pathology, Oslo University Hospital-Rikshospitalet, Oslo, Norway; Institute of Clinical Medicine, University of Oslo, Oslo, Norway
| | - Hogne Røed Nilsen
- Department of Pathology, Oslo University Hospital-Rikshospitalet, Oslo, Norway
| | - Frank Sætre
- Department of Pathology, Oslo University Hospital-Rikshospitalet, Oslo, Norway; Institute of Clinical Medicine, University of Oslo, Oslo, Norway
| | - Jørgen Jahnsen
- Institute of Clinical Medicine, University of Oslo, Oslo, Norway; Department of Gastroenterology, Akershus University Hospital, Lørenskog, Norway
| | - Rune Horneland
- Department of Transplantation Medicine, Section for Transplant Surgery, Oslo University Hospital-Rikshospitalet, Oslo, Norway
| | - Sheraz Yaqub
- Department of Gastrointestinal Surgery, Oslo University Hospital-Rikshospitalet, Oslo, Norway; Institute of Clinical Medicine, University of Oslo, Oslo, Norway
| | - Einar Martin Aandahl
- Department of Transplantation Medicine, Section for Transplant Surgery, Oslo University Hospital-Rikshospitalet, Oslo, Norway
| | - Knut E A Lundin
- Department of Gastroenterology, Oslo University Hospital-Rikshospitalet, Oslo, Norway; Institute of Clinical Medicine, University of Oslo, Oslo, Norway
| | - Espen S Bækkevold
- Department of Pathology, Oslo University Hospital-Rikshospitalet, Oslo, Norway
| | - Frode L Jahnsen
- Department of Pathology, Oslo University Hospital-Rikshospitalet, Oslo, Norway; Institute of Clinical Medicine, University of Oslo, Oslo, Norway.
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Kim TB, Ionescu L, Avdimiretz N, Murdoch F, Larsen IM, Motyka B, West LJ, Urschel S. Alterations in the immune phenotype of thymectomized children and the development of atopic disorders after heart transplantation. Pediatr Transplant 2022; 26:e14252. [PMID: 35187796 DOI: 10.1111/petr.14252] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Revised: 01/04/2022] [Accepted: 02/03/2022] [Indexed: 11/29/2022]
Abstract
BACKGROUND Atopic disorders are more common in children after heart transplant (HTx). We hypothesized that HTx at an early age and thymus excision (TE) affect development of T and B cells, especially regulatory T cells (Tregs), which help maintain tolerance. METHODS In this single-center study including 24 patients transplanted between 2013 and 2018, we investigated lymphocyte patterns in relation to these factors using flow cytometry. Clinical data were collected from standardized questionnaires and medical charts. Patients were stratified into TE and non-TE groups as well as patients with and without post-transplant atopy development/worsening. RESULTS 64% of TE patients experienced new or worsening asthma/eczema post-transplant compared to 20% of non-TE patients. TE patients had higher total Treg proportions (CD4+CD25+CD127lo) than non-TE patients (p = .043), but borderline significantly lower naïve Tregs (CD45RA+CD27-) (p = .057). Memory CD4+ T cells were higher in TE patients in trend (p = .084). Total Tregs did not differ between atopic/nonatopic groups, although naïve Tregs were significantly lower in atopic patients (p = .028). Memory CD4+ T cells were higher in atopic patients in trend (p = .082). IgM+IgD+ B cells were higher in nonatopic patients in trend (p = .064). CONCLUSIONS New/worsening atopy is more common in thymectomized HTx children and is associated with alterations in T-cell profiles. Avoiding TE may prevent these alterations and reduce incidence of atopy post-HTx.
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Affiliation(s)
- Tiffany B Kim
- Department of Pediatrics, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada
| | - Lavinia Ionescu
- Department of Pediatrics, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada
| | - Nicholas Avdimiretz
- Department of Pediatric Respirology, The Hospital for Sick Children, University of Toronto, Toronto, Ontario, Canada
| | - Faye Murdoch
- Department of Pediatrics, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada.,Stollery Children's Hospital, Edmonton, Alberta, Canada
| | - Ingrid M Larsen
- Department of Pediatrics, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada
| | - Bruce Motyka
- Department of Pediatrics, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada
| | - Lori J West
- Department of Pediatrics, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada.,Stollery Children's Hospital, Edmonton, Alberta, Canada
| | - Simon Urschel
- Department of Pediatrics, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada.,Stollery Children's Hospital, Edmonton, Alberta, Canada
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Au KM, Tisch R, Wang AZ. Immune Checkpoint Ligand Bioengineered Schwann Cells as Antigen-Specific Therapy for Experimental Autoimmune Encephalomyelitis. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2107392. [PMID: 34775659 PMCID: PMC8813901 DOI: 10.1002/adma.202107392] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Revised: 11/08/2021] [Indexed: 05/05/2023]
Abstract
Failure to establish immune tolerance leads to the development of autoimmune disease. The ability to regulate autoreactive T cells without inducing systemic immunosuppression represents a major challenge in the development of new strategies to treat autoimmune disease. Here, a translational method for bioengineering programmed death-ligand 1 (PD-L1)- and cluster of differentiation 86 (CD86)-functionalized mouse Schwann cells (SCs) to prevent and ameliorate multiple sclerosis (MS) in established mouse models of chronic and relapsing-remitting experimental autoimmune encephalomyelitis (EAE) is described. It is shown that the intravenous (i.v.) administration of immune checkpoint ligand functionalized mouse SCs modifies the course of disease and ameliorates EAE. Further, it is found that such bioengineered mouse SCs inhibit the differentiation of myelin-specific helper T cells into pathogenic T helper type-1 (Th 1) and type-17 (Th 17) cells, promote the development of tolerogenic myelin-specific regulatory T (Treg ) cells, and resolve inflammatory central nervous system microenvironments without inducing systemic immunosuppression.
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Affiliation(s)
- Kin Man Au
- Laboratory of Nano- and Translational Medicine, Carolina Center for Cancer Nanotechnology Excellence, Carolina Institute of Nanomedicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
- Department of Radiation Oncology, Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
- Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, TX, 75230, USA
| | - Roland Tisch
- Department of Microbiology and Immunology School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Andrew Z Wang
- Laboratory of Nano- and Translational Medicine, Carolina Center for Cancer Nanotechnology Excellence, Carolina Institute of Nanomedicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
- Department of Radiation Oncology, Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
- Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, TX, 75230, USA
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Au KM, Tisch R, Wang AZ. In Vivo Bioengineering of Beta Cells with Immune Checkpoint Ligand as a Treatment for Early-Onset Type 1 Diabetes Mellitus. ACS NANO 2021; 15:19990-20002. [PMID: 34843648 DOI: 10.1021/acsnano.1c07538] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Type 1 diabetes mellitus (T1DM) is an autoimmune disease caused by autoreactive T cells targeting the insulin-producing beta (β) cells. Despite advances in insulin therapy, T1DM still leads to high morbidity and mortality in patients. A key focus of T1DM research has been to identify strategies that re-establish self-tolerance and suppress ongoing autoimmunity. Here, we describe a strategy that utilizes pretargeting and glycochemistry to bioengineer β cells in situ to induce β-cell-specific tolerance. We hypothesized that β-cell-targeted Ac4ManNAz-encapsulated nanoparticles deliver and establish β cells with high levels of surface reactive azide groups. We further theorized that administration of a dibenzylcyclooctyne (DBCO)-functionalized programmed death-ligand 1 immunoglobulin fusion protein (PD-L1-Ig) can be readily conjugated to the surface of native β cells. Using nonobese diabetic (NOD) mice, we demonstrated that our strategy effectively and selectively conjugates PD-L1 onto β cells through bioorthogonal stain-promoted azide-alkyne cycloaddition. We also showed that the in vivo functionalized β cells simultaneously present islet-specific antigen and PD-L1 to the engaged T cells, reversing early onset T1DM by reducing IFN-gamma expressing cytotoxic toxic T cells and inducing antigen-specific tolerance.
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Affiliation(s)
- Kin Man Au
- Laboratory of Nano- and Translational Medicine, Carolina Center for Cancer Nanotechnology Excellence, Carolina Institute of Nanomedicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
- Department of Radiation Oncology, Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
- Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, Texas 75230, United States
| | - Roland Tisch
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
- Department of Microbiology and Immunology, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Andrew Z Wang
- Laboratory of Nano- and Translational Medicine, Carolina Center for Cancer Nanotechnology Excellence, Carolina Institute of Nanomedicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
- Department of Radiation Oncology, Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
- Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, Texas 75230, United States
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Markovics A, Rosenthal KS, Mikecz K, Carambula RE, Ciemielewski JC, Zimmerman DH. Restoring the Balance between Pro-Inflammatory and Anti-Inflammatory Cytokines in the Treatment of Rheumatoid Arthritis: New Insights from Animal Models. Biomedicines 2021; 10:44. [PMID: 35052724 PMCID: PMC8772713 DOI: 10.3390/biomedicines10010044] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2021] [Revised: 12/17/2021] [Accepted: 12/23/2021] [Indexed: 12/15/2022] Open
Abstract
Rheumatoid arthritis (RA) and other autoimmune inflammatory diseases are examples of imbalances within the immune system (disrupted homeostasis) that arise from the effects of an accumulation of environmental and habitual insults over a lifetime, combined with genetic predispositions. This review compares current immunotherapies-(1) disease-modifying anti-rheumatic drugs (DMARDs) and (2) Janus kinase (JAK) inhibitors (jakinibs)-to a newer approach-(3) therapeutic vaccines (using the LEAPS vaccine approach). The Ligand Epitope Antigen Presentation System (LEAPS) therapies are capable of inhibiting ongoing disease progression in animal models. Whereas DMARDs ablate or inhibit specific proinflammatory cytokines or cells and jakinibs inhibit the receptor activation cascade for expression of proinflammatory cytokines, the LEAPS therapeutic vaccines specifically modulate the ongoing antigen-specific, disease-driving, proinflammatory T memory cell responses. This decreases disease presentation and changes the cytokine conversation to decrease the expression of inflammatory cytokines (IL-17, IL-1(α or β), IL-6, IFN-γ, TNF-α) while increasing the expression of regulatory cytokines (IL-4, IL-10, TGF-β). This review refocuses the purpose of therapy for RA towards rebalancing the immune system rather than compromising specific components to stop disease. This review is intended to be thought provoking and look forward towards new therapeutic modalities rather than present a final definitive report.
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Affiliation(s)
- Adrienn Markovics
- Department of Orthopedic Surgery, Rush University Medical Center, Chicago, IL 60612, USA; (A.M.); (K.M.)
| | - Ken S. Rosenthal
- Department of Basic Sciences, Augusta University/University of Georgia Medical Partnership, Athens, GA 30602, USA;
- Department of Integrative Medical Sciences, NE Ohio Medical University, Rootstown, OH 44272, USA
| | - Katalin Mikecz
- Department of Orthopedic Surgery, Rush University Medical Center, Chicago, IL 60612, USA; (A.M.); (K.M.)
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Induction of Foxp3 and activation of Tregs by HSP gp96 for treatment of autoimmune diseases. iScience 2021; 24:103445. [PMID: 34877502 PMCID: PMC8633978 DOI: 10.1016/j.isci.2021.103445] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Revised: 09/16/2021] [Accepted: 11/10/2021] [Indexed: 01/06/2023] Open
Abstract
Upregulation and stabilization of Foxp3 expression in Tregs are essential for regulating Treg function and immune homeostasis. In this study, gp96 immunization showed obvious therapeutic effects in a Lyn–/– mouse model of systemic lupus erythematosus. Moreover, gp96 alleviated the initiation and progression of MOG-induced experimental autoimmune encephalomyelitis. Immunization of gp96 increased Treg frequency, expansion, and suppressive function. Gene expression profiling identified the NF-κB family member p65 and c-Rel as the key transcription factors for enhanced Foxp3 expression in Treg by gp96. Mutant gp96 within its Toll-like receptor (TLR) binding domain, TLR2 knockout mice, and mice with cell-specific deletion of MyD88, were used to demonstrate that gp96 activated Tregs and induced Foxp3 expression via a TLR2-MyD88-mediated NF-κB signaling pathway. Taken together, these results show that gp96 immunization restricted antibody-induced and Th-induced autoimmune diseases by integrating Treg expansion and activation, indicating its potential clinical usefulness against autoimmune diseases. SLE symptoms in Lyn–/– mice are ameliorated by gp96 immunization Tregs expanded by gp96 provide potential in suppressing Th-mediated EAE Gp96 promotes Treg proliferation, stability, and suppressive function Gp96 binds to and activates Treg in a TLR2-MyD88-NF-кB-Foxp3 pathway
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Induction of antigen-specific Treg cells in treating autoimmune uveitis via bystander suppressive pathways without compromising anti-tumor immunity. EBioMedicine 2021; 70:103496. [PMID: 34280776 PMCID: PMC8318874 DOI: 10.1016/j.ebiom.2021.103496] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Revised: 07/03/2021] [Accepted: 07/06/2021] [Indexed: 01/24/2023] Open
Abstract
BACKGROUND Induction of autoantigen-specific Treg cells that suppress tissue-specific autoimmunity without compromising beneficial immune responses is the holy-grail for immunotherapy to autoimmune diseases. METHODS In a model of experimental autoimmune uveitis (EAU) that mimics human uveitis, ocular inflammation was induced by immunization with retinal antigen interphotoreceptor retinoid-binding protein (IRBP). Mice were given intraperitoneal injection of αCD4 antibody (Ab) after the onset of disease, followed by administration of IRBP. EAU was evaluated clinically and functionally. Splenocytes, CD4+CD25- and CD4+CD25+ T cells were sorted and cultured with IRBP or αCD3 Ab. T cell proliferation and cytokine production were assessed. FINDINGS The experimental approach resulted in remission of ocular inflammation and rescue of visual function in mice with established EAU. Mechanistically, the therapeutic effect was mediated by induction of antigen-specific Treg cells that inhibited IRBP-driven Th17 response in TGF-β and IL-10 dependent fashion. Importantly, the Ab-mediated immune tolerance could be achieved in EAU mice by administration of retinal autoantigens, arrestin but not limited to IRBP only, in an antigen-nonspecific bystander manner. Further, these EAU-suppressed tolerized mice did not compromise their anti-tumor T immunity in melanoma model. INTERPRETATION We successfully addressed a specific immunotherapy of EAU by in vivo induction of autoantigen-specific Treg cells without compromising host overall T cell immunity, which should have potential implication for patients with autoimmune uveitis. FUNDING This study was supported by the Natural Science Foundation of Guangdong Province and the Fundamental Research Fund of the State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center.
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Au KM, Medik Y, Ke Q, Tisch R, Wang AZ. Immune Checkpoint-Bioengineered Beta Cell Vaccine Reverses Early-Onset Type 1 Diabetes. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2101253. [PMID: 33963786 PMCID: PMC8222180 DOI: 10.1002/adma.202101253] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2021] [Revised: 03/18/2021] [Indexed: 05/14/2023]
Abstract
Type 1 diabetes mellitus (T1DM) is a chronic autoimmune disease that results from autoreactive T cells destroying insulin-producing pancreatic beta (β) cells. The development of T1DM is associated with the deficiency of co-inhibitory immune checkpoint ligands (e.g., PD-L1, CD86, and Gal-9) in β cells. Here, a new translational approach based on metabolic glycoengineering and bioorthogonal click chemistry, which bioengineers β cells with co-inhibitory immune checkpoint molecules that induce antigen-specific immunotolerance and reverse early-onset hyperglycemia is reported. To achieve this goal, a subcutaneous injectable acellular pancreatic extracellular matrix platform for localizing the bioengineered β cells while creating a pancreas-like immunogenic microenvironment, in which the autoreactive T cells can interface with the β cells, is devised.
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Affiliation(s)
- Kin Man Au
- Laboratory of Nano- and Translational Medicine, Carolina Center for Cancer Nanotechnology Excellence, Carolina Institute of Nanomedicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
- Department of Radiation Oncology, Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Yusra Medik
- Laboratory of Nano- and Translational Medicine, Carolina Center for Cancer Nanotechnology Excellence, Carolina Institute of Nanomedicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
- Department of Radiation Oncology, Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Qi Ke
- Department of Microbiology and Immunology School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Roland Tisch
- Department of Microbiology and Immunology School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Andrew Z Wang
- Laboratory of Nano- and Translational Medicine, Carolina Center for Cancer Nanotechnology Excellence, Carolina Institute of Nanomedicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
- Department of Radiation Oncology, Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
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Rocamora-Reverte L, Melzer FL, Würzner R, Weinberger B. The Complex Role of Regulatory T Cells in Immunity and Aging. Front Immunol 2021; 11:616949. [PMID: 33584708 PMCID: PMC7873351 DOI: 10.3389/fimmu.2020.616949] [Citation(s) in RCA: 76] [Impact Index Per Article: 25.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Accepted: 12/07/2020] [Indexed: 12/20/2022] Open
Abstract
The immune system is a tightly regulated network which allows the development of defense mechanisms against foreign antigens and tolerance toward self-antigens. Regulatory T cells (Treg) contribute to immune homeostasis by maintaining unresponsiveness to self-antigens and suppressing exaggerated immune responses. Dysregulation of any of these processes can lead to serious consequences. Classically, Treg cell functions have been described in CD4+ T cells, but other immune cells also harbour the capacity to modulate immune responses. Regulatory functions have been described for different CD8+ T cell subsets, as well as other T cells such as γδT cells or NKT cells. In this review we describe the diverse populations of Treg cells and their role in different scenarios. Special attention is paid to the aging process, which is characterized by an altered composition of immune cells. Treg cells can contribute to the development of various age-related diseases but they are poorly characterized in aged individuals. The huge diversity of cells that display immune modulatory functions and the lack of universal markers to identify Treg make the expanding field of Treg research complex and challenging. There are still many open questions that need to be answered to solve the enigma of regulatory T cells.
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Affiliation(s)
- Lourdes Rocamora-Reverte
- Department of Immunology, Institute for Biomedical Aging Research, University of Innsbruck, Innsbruck, Austria
| | - Franz Leonard Melzer
- Department of Immunology, Institute for Biomedical Aging Research, University of Innsbruck, Innsbruck, Austria
| | - Reinhard Würzner
- Institute of Hygiene & Medical Microbiology, Department of Hygiene, Microbiology and Public Health, Medical University Innsbruck, Innsbruck, Austria
| | - Birgit Weinberger
- Department of Immunology, Institute for Biomedical Aging Research, University of Innsbruck, Innsbruck, Austria
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Zhao S, Ma J, Zhu X, Zhang J, Wu R. Chronic Refractory Immune Thrombocytopenia Is Associated With Variants in Immune Genes. Clin Appl Thromb Hemost 2021; 27:10760296211059813. [PMID: 34786962 PMCID: PMC8619729 DOI: 10.1177/10760296211059813] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Revised: 10/09/2021] [Accepted: 10/27/2021] [Indexed: 01/19/2023] Open
Abstract
The pathogenesis of chronic refractory immune thrombocytopenia (C/RITP) is mechanistically complex and considerably varies across patients. Few studies have focused on the genetic characteristics of C/RITP in children. The aim of this study was to analyze and summarize the clinical manifestations and genetic characteristics of C/RITP children with mutations in immune-related genes. In the study, 51 children with variants in immune-related genes (mutation group) and 103 children with no abnormal mutations (control group) were enrolled. Children in the mutation group showed severity of hemorrhage, a higher incidence of abnormal immunological indices, and an increased expression of SLE biomarkers. The number of peripheral T and B lymphocytes in the mutation group significantly increased. Nine patients (17.6%) had probable pathogenic variant genes associated with primary immunodeficiencies (TNFRSF13B, CARD11, CBL, and RAG2), and 42 patients (82.4%) had variants of uncertain significance in 23 genes. C/RITP patients with variants in immune-related genes had more severe bleeding, abnormal immunological indices, and an increased expression of SLE biomarker. Next-generation sequenciong (NGS) might be a useful way to differentiate those patients from C/RITP.
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Affiliation(s)
- Shasha Zhao
- Beijing Children’s Hospital, Capital Medical University, Beijing, China
| | - Jingyao Ma
- Beijing Children’s Hospital, Capital Medical University, Beijing, China
| | - Xiaojing Zhu
- Beijing Children’s Hospital, Capital Medical University, Beijing, China
| | - Jialu Zhang
- Beijing Children’s Hospital, Capital Medical University, Beijing, China
| | - Runhui Wu
- Beijing Children’s Hospital, Capital Medical University, Beijing, China
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12
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Fok JA, Mayer C. Genetic-Code-Expansion Strategies for Vaccine Development. Chembiochem 2020; 21:3291-3300. [PMID: 32608153 PMCID: PMC7361271 DOI: 10.1002/cbic.202000343] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Revised: 06/29/2020] [Indexed: 12/16/2022]
Abstract
By providing long-term protection against infectious diseases, vaccinations have significantly reduced death and morbidity worldwide. In the 21st century, (bio)technological advances have paved the way for developing prophylactic vaccines that are safer and more effective as well as enabling the use of vaccines as therapeutics to treat human diseases. Here, we provide a focused review of the utility of genetic code expansion as an emerging tool for the development of vaccines. Specifically, we discuss how the incorporation of immunogenic noncanonical amino acids can aid in eliciting immune responses against adverse self-proteins and highlight the potential of an expanded genetic code for the construction of replication-incompetent viruses. We close the review by discussing the future prospects and remaining challenges for the application of these approaches in the development of both prophylactic and therapeutic vaccines in the near future.
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Affiliation(s)
- Jelle A. Fok
- Stratingh Institute for ChemistryUniversity of GroningenNijenborgh 49474 AGGroningen (TheNetherlands
| | - Clemens Mayer
- Stratingh Institute for ChemistryUniversity of GroningenNijenborgh 49474 AGGroningen (TheNetherlands
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13
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Lung P, Yang J, Li Q. Nanoparticle formulated vaccines: opportunities and challenges. NANOSCALE 2020; 12:5746-5763. [PMID: 32124894 DOI: 10.1039/c9nr08958f] [Citation(s) in RCA: 54] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Vaccines harness the inherent properties of the immune system to prevent diseases or treat existing ones. Continuous efforts have been devoted to both gaining a mechanistic understanding of how the immune system operates and designing vaccines with high efficacies and effectiveness. Advancements in nanotechnology in recent years have generated unique opportunities to meet the daunting challenges associated with immunology and vaccine development. Firstly, nanoparticle formulated systems provide ideal model systems for studying the operation of the immune system, making it possible to systematically identify key factors and understand their roles in specific immune responses. Also, the versatile compositions/architectures of nanoparticle systems enable new strategies/novel platforms for developing vaccines with high efficacies and effectiveness. In this review, we discuss the advantages of nanoparticles and the challenges faced during vaccine development, through the framework of the immunological mechanisms of vaccination, with the aim of bridging the gap between immunology and materials science, which are both involved in vaccine design. The knowledge obtained provides general guidelines for future vaccine development.
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Affiliation(s)
- Pingsai Lung
- Department of Physics, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong.
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14
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Padutsch T, Sendetski M, Huber C, Peters N, Pfizenmaier K, Bethea JR, Kontermann RE, Fischer R. Superior Treg-Expanding Properties of a Novel Dual-Acting Cytokine Fusion Protein. Front Pharmacol 2019; 10:1490. [PMID: 31920671 PMCID: PMC6930692 DOI: 10.3389/fphar.2019.01490] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Accepted: 11/19/2019] [Indexed: 11/13/2022] Open
Abstract
Autoimmune diseases are caused by uncontrolled endogenous immune responses against healthy cells. They may develop due to an impaired function of regulatory T cells (Tregs), which normally suppress self-specific effector immune cells. Interleukin 2 (IL-2) and tumor necrosis factor (TNF) have been identified as key players that promote expansion, function, and stability of Tregs. In vivo, both low-dose IL-2 therapy and TNF receptor 2 (TNFR2) agonism were shown to expand Tregs and alleviate autoimmunity. We here designed a novel dimeric dual-acting fusion cytokine, where mouse IL-2 is genetically linked to a TNFR2-selective single-chain TNF mutein (IL2-EHD2-sc-mTNFR2). IL2-EHD2-sc-mTNFR2 showed high affinity to TNFR2 and efficiently activated IL-2 and TNFR2-selective signaling pathways. Further, IL2-EHD2-sc-mTNFR2 promoted superior Treg expansion, with both the IL-2 and the TNFR2 agonist (sc-mTNFR2) component necessary for this biological response. Ultimately, we propose that IL2-EHD2-sc-mTNFR2 is a dual-acting cytokine that efficiently promotes Treg expansion and might have a superior therapeutic window than conventional IL-2-based drugs.
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Affiliation(s)
- Tanja Padutsch
- Institute of Cell Biology and Immunology, University of Stuttgart, Stuttgart, Germany
| | - Maksim Sendetski
- Institute of Cell Biology and Immunology, University of Stuttgart, Stuttgart, Germany
| | - Carina Huber
- Institute of Cell Biology and Immunology, University of Stuttgart, Stuttgart, Germany
| | - Nathalie Peters
- Institute of Cell Biology and Immunology, University of Stuttgart, Stuttgart, Germany
| | - Klaus Pfizenmaier
- Institute of Cell Biology and Immunology, University of Stuttgart, Stuttgart, Germany.,Stuttgart Research Center Systems Biology, University of Stuttgart, Stuttgart, Germany
| | - John R Bethea
- Department of Biology, Drexel University, Philadelphia, PA, United States
| | - Roland E Kontermann
- Institute of Cell Biology and Immunology, University of Stuttgart, Stuttgart, Germany.,Stuttgart Research Center Systems Biology, University of Stuttgart, Stuttgart, Germany
| | - Roman Fischer
- Institute of Cell Biology and Immunology, University of Stuttgart, Stuttgart, Germany.,Department of Biology, Drexel University, Philadelphia, PA, United States
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15
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Jiang C, Wang H, Xue M, Lin L, Wang J, Cai G, Shen Q. Reprograming of peripheral Foxp3+ regulatory T cell towards Th17-like cell in patients with active systemic lupus erythematosus. Clin Immunol 2019; 209:108267. [DOI: 10.1016/j.clim.2019.108267] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2019] [Revised: 08/30/2019] [Accepted: 10/04/2019] [Indexed: 12/29/2022]
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16
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Yamaguchi T, Teraguchi S, Furusawa C, Machiyama H, Watanabe TM, Fujita H, Sakaguchi S, Yanagida T. Theoretical modeling reveals that regulatory T cells increase T-cell interaction with antigen-presenting cells for stable immune tolerance. Int Immunol 2019; 31:743-753. [PMID: 31131864 PMCID: PMC6794947 DOI: 10.1093/intimm/dxz043] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Accepted: 05/24/2019] [Indexed: 01/22/2023] Open
Abstract
The immune system in tolerance maintains cell diversity without responding to self-antigens. Foxp3-expressing CD25+CD4+ regulatory T cells (Tregs) inhibit T-cell activation through various molecular mechanisms. However, several key questions are still not resolved, including how Tregs control the immune response on the basis of their self-skewed T-cell receptor repertoire and how Tregs avoid impeding relevant immunity against pathogens. Here, we show that Tregs promote the proliferation of conventional T cells in the presence of excessive co-stimulation when murine T cells are stimulated in vitro with allogeneic antigen-presenting cells (APCs). Antigen-specific Tregs increase the number of cells interacting with dendritic cells (DCs) by increasing the number of viable DCs and the expression of adhesion molecules on DCs. Theoretical simulations and mathematical models representing the dynamics of T-APC interaction and T-cell numbers in a lymph node indicate that Tregs reduce the dissociation probability of T cells from APCs and increase the new association. These functions contribute to tolerance by enhancing the interaction of low-affinity T cells with APCs. Supporting the theoretical analyses, we found that reducing the T-cell numbers in mice increases the ratio of specific T cells among CD4+ T cells after immunization and effectively induces autoimmune diabetes in non obese diabetes mice. Thus, as a critical function, antigen-specific Tregs stabilize the immune state, irrespective of it being tolerant or responsive, by augmenting T-APC interaction. We propose a novel regulation model in which stable tolerance with large heterogeneous populations proceeds to a specific immune response through a transient state with few populations.
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Affiliation(s)
- Tomoyuki Yamaguchi
- Basic Immunology Laboratory, Research Institute, Nozaki Tokushukai Hospital, Tanigawa, Daito, Osaka, Japan
- Single Molecule Imaging, WPI Immunology Frontier Research Center, Osaka University, Furuedai, Suita, Osaka, Japan
- Quantitative Biology Center, RIKEN, Furuedai, Suita, Osaka, Japan
| | - Shunsuke Teraguchi
- Systems Immunology, WPI Immunology Frontier Research Center, Osaka University, Yamadaoka, Suita, Osaka, Japan
| | - Chikara Furusawa
- Quantitative Biology Center, RIKEN, Furuedai, Suita, Osaka, Japan
- Universal Biology Institute, University of Tokyo, Hongo, Tokyo, Japan
| | - Hiroaki Machiyama
- Single Molecule Imaging, WPI Immunology Frontier Research Center, Osaka University, Furuedai, Suita, Osaka, Japan
- Quantitative Biology Center, RIKEN, Furuedai, Suita, Osaka, Japan
| | | | - Hideaki Fujita
- Single Molecule Imaging, WPI Immunology Frontier Research Center, Osaka University, Furuedai, Suita, Osaka, Japan
- Quantitative Biology Center, RIKEN, Furuedai, Suita, Osaka, Japan
| | - Shimon Sakaguchi
- Experimental Immunology, WPI Immunology Frontier Research Center, Osaka University, Yamadaoka, Suita, Osaka, Japan
| | - Toshio Yanagida
- Single Molecule Imaging, WPI Immunology Frontier Research Center, Osaka University, Furuedai, Suita, Osaka, Japan
- Quantitative Biology Center, RIKEN, Furuedai, Suita, Osaka, Japan
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17
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Dehghanzad R, Pahlevan Kakhki M, Alikhah A, Sahraian MA, Behmanesh M. The Putative Association of TOB1-AS1 Long Non-coding RNA with Immune Tolerance: A Study on Multiple Sclerosis Patients. Neuromolecular Med 2019; 22:100-110. [PMID: 31482275 DOI: 10.1007/s12017-019-08567-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2019] [Accepted: 08/21/2019] [Indexed: 11/30/2022]
Abstract
The hallmark of multiple sclerosis (MS) pathogenesis is the breakdown of peripheral tolerance in the immune system. However, its molecular mechanism is not completely understood. Since long non-coding RNAs (lncRNAs) has played important roles in regulation of immunological pathways, here, we evaluated the expression of a novel lncRNA, TOB1-AS1, and its putative associated coding genes in the mechanism of maintaining immune tolerance in peripheral blood of MS patients to assess their possible roles in MS pathogenesis. In this study, 39 MS patients and 32 healthy matched controls were recruited. Real-time PCR standard curve method was used to quantify transcript levels of TOB1-AS1, TOB1, SKP2, and TSG. In addition, the potential sex hormone receptor binding sites on target genes promoter were analyzed using JASPR software. This work demonstrates a negative correlation between TOB1-AS1 expression and EDSS of patients. Also, a robust dysregulation of co-expression of TOB1-AS1 lncRNA and the coding genes in MS patients compared to controls was observed. Such dysregulation in this pathway may be related to MS pathogenesis and response to interferon treatment.
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Affiliation(s)
- Reyhaneh Dehghanzad
- Department of Genetics, Faculty of Biological Sciences, Tarbiat Modares University, P.O. Box: 14115-154, Tehran, Iran
| | - Majid Pahlevan Kakhki
- Department of Genetics, Faculty of Biological Sciences, Tarbiat Modares University, P.O. Box: 14115-154, Tehran, Iran
| | - Asieh Alikhah
- Department of Genetics, Faculty of Biological Sciences, Tarbiat Modares University, P.O. Box: 14115-154, Tehran, Iran
| | - Mohammad Ali Sahraian
- MS Research Center, Neuroscience Institute, Tehran University of Medical Science, Tehran, Iran
| | - Mehrdad Behmanesh
- Department of Genetics, Faculty of Biological Sciences, Tarbiat Modares University, P.O. Box: 14115-154, Tehran, Iran.
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18
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Kasagi S, Wang D, Zhang P, Zanvit P, Chen H, Zhang D, Li J, Che L, Maruyama T, Nakatsukasa H, Wu R, Jin W, Sun L, Chen W. Combination of apoptotic T cell induction and self-peptide administration for therapy of experimental autoimmune encephalomyelitis. EBioMedicine 2019; 44:50-59. [PMID: 31097410 PMCID: PMC6603850 DOI: 10.1016/j.ebiom.2019.05.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Revised: 04/29/2019] [Accepted: 05/02/2019] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND Clinical trials on multiple sclerosis with repeated injections of monoclonal antibodies depleting CD4+ T cells have not resulted in much success as a disease therapy. Here, we developed an immunotherapy for EAE in mice by combining a transient depletion of T cells together with the administration of neuron derived peptides. METHODS EAE was induced in SJL and C57BL/6 mice, by proteolipid protein peptide PLP139-151 (pPLP) and myelin-oligodendrocyte glycoprotein MOG35-55 (pMOG) peptides, respectively. Anti-CD4 and anti-CD8 antibody were injected intraperitoneally before or after peptide immunization. EAE scores were evaluated and histology data from brain and spinal cord were analyzed. Splenocytes were isolated and CD4+, CD4+CD25- and CD4+CD25+ T cells were purified and cultured in the presence of either specific peptides or anti-CD3 antibody and proliferation of T cells as well as cytokines in supernatant were assessed. FINDINGS This experimental treatment exhibited therapeutic effects on mice with established EAE in pPLP-susceptible SJL mice and pMOG-susceptible C57BL/6 mice. Mechanistically, we revealed that antibody-induced apoptotic T cells triggered macrophages to produce TGFβ, and together with administered auto-antigenic peptides, generated antigen-specific Foxp3+ regulatory T cells (Treg cells) in vivo. INTERPRETATION We successfully developed a specific immunotherapy to EAE by generating autoantigen-specific Treg cells. These findings have overcome the drawbacks of long and repeated depletion of CD4+ T cells, but also obtained long-term immune tolerance, which should have clinical implications for the development of a new effective therapy for multiple sclerosis. FUND: This research was supported by the Intramural Research Program of the NIH, NIDCR.
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Affiliation(s)
- Shimpei Kasagi
- Mucosal Immunology Section, NIDCR, NIH, Bethesda, MD 20892, USA
| | - Dandan Wang
- Mucosal Immunology Section, NIDCR, NIH, Bethesda, MD 20892, USA; Department of Rheumatology and Immunology, The Affiliated Drum Tower Hospital of Nanjing University Medical School, Nanjing, Jiangsu 210008, China
| | - Pin Zhang
- Mucosal Immunology Section, NIDCR, NIH, Bethesda, MD 20892, USA
| | - Peter Zanvit
- Mucosal Immunology Section, NIDCR, NIH, Bethesda, MD 20892, USA
| | - Hua Chen
- Mucosal Immunology Section, NIDCR, NIH, Bethesda, MD 20892, USA
| | - Dunfang Zhang
- Mucosal Immunology Section, NIDCR, NIH, Bethesda, MD 20892, USA
| | - Jia Li
- Mucosal Immunology Section, NIDCR, NIH, Bethesda, MD 20892, USA
| | - Li Che
- Mucosal Immunology Section, NIDCR, NIH, Bethesda, MD 20892, USA
| | | | | | - Ruiqing Wu
- Mucosal Immunology Section, NIDCR, NIH, Bethesda, MD 20892, USA
| | - Wenwen Jin
- Mucosal Immunology Section, NIDCR, NIH, Bethesda, MD 20892, USA
| | - Lingyun Sun
- Department of Rheumatology and Immunology, The Affiliated Drum Tower Hospital of Nanjing University Medical School, Nanjing, Jiangsu 210008, China
| | - WanJun Chen
- Mucosal Immunology Section, NIDCR, NIH, Bethesda, MD 20892, USA.
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19
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Pediatric Evans syndrome is associated with a high frequency of potentially damaging variants in immune genes. Blood 2019; 134:9-21. [PMID: 30940614 DOI: 10.1182/blood-2018-11-887141] [Citation(s) in RCA: 92] [Impact Index Per Article: 18.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Accepted: 03/13/2019] [Indexed: 12/14/2022] Open
Abstract
Evans syndrome (ES) is a rare severe autoimmune disorder characterized by the combination of autoimmune hemolytic anemia and immune thrombocytopenia. In most cases, the underlying cause is unknown. We sought to identify genetic defects in pediatric ES (pES), based on a hypothesis of strong genetic determinism. In a national, prospective cohort of 203 patients with early-onset ES (median [range] age at last follow-up: 16.3 years ([1.2-41.0 years]) initiated in 2004, 80 nonselected consecutive individuals underwent genetic testing. The clinical data were analyzed as a function of the genetic findings. Fifty-two patients (65%) received a genetic diagnosis (the M+ group): 49 carried germline mutations and 3 carried somatic variants. Thirty-two (40%) had pathogenic mutations in 1 of 9 genes known to be involved in primary immunodeficiencies (TNFRSF6, CTLA4, STAT3, PIK3CD, CBL, ADAR1, LRBA, RAG1, and KRAS), whereas 20 patients (25%) carried probable pathogenic variants in 16 genes that had not previously been reported in the context of autoimmune disease. Lastly, no genetic abnormalities were found in the remaining 28 patients (35%, the M- group). The M+ group displayed more severe disease than the M- group, with a greater frequency of additional immunopathologic manifestations and a greater median number of lines of treatment. Six patients (all from the M+ group) died during the study. In conclusion, pES was potentially genetically determined in at least 65% of cases. Systematic, wide-ranging genetic screening should be offered in pES; the genetic findings have prognostic significance and may guide the choice of a targeted treatment.
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20
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Avdimiretz N, Seitz S, Kim T, Murdoch F, Urschel S. Allergies and autoimmune disorders in children after heart transplantation. Clin Transplant 2018; 32:e13400. [PMID: 30176068 DOI: 10.1111/ctr.13400] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2018] [Revised: 08/07/2018] [Accepted: 08/29/2018] [Indexed: 12/15/2022]
Abstract
Pediatric heart transplantation requires lifelong immune suppression and may require thymectomy, both of which alter T-cell repertoires. We hypothesized that atopic and autoimmune diseases are more common in pediatric heart transplant patients than the general population, and that transplantation in early childhood increases the risk of development or worsening of atopic or autoimmune disease. A cross-sectional single-center study including 21 heart transplant patients aged ≤18 years was conducted. Data collected included age at transplant, induction, thymectomy, and development and severity of atopic or autoimmune disease. A majority (67%) reported having any atopic disease post-transplant, all of whom reported onset or worsening post-transplantation. Thymectomized patients were significantly more likely to have asthma (P = 0.018) and report asthma worsening post-transplant (P = 0.045). Patients with worsening of asthma post-transplant were transplanted at a significantly younger age (P = 0.040). ABO incompatible and ABO compatible recipients presented similarly. Anemia was common (38%) but not always clearly of autoimmune origin. Atopic diseases are common in children following heart transplantation: Compared to the general population, there is a higher prevalence of eczema (43% vs 11%) and asthma (33% vs 9%). Both thymectomy and younger age at transplant are associated with atopic disorders, possibly due to altered T-cell repertoires.
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Affiliation(s)
- Nicholas Avdimiretz
- Department of Pediatrics, Stollery Children's Hospital, University of Alberta, Edmonton, Alberta, Canada.,Division of Pediatric Respirology, Hospital for Sick Children, University of Toronto, Toronto, Ontario, Canada
| | | | - Tiffany Kim
- Department of Pediatrics, Stollery Children's Hospital, University of Alberta, Edmonton, Alberta, Canada
| | - Faye Murdoch
- Department of Pediatrics, Stollery Children's Hospital, University of Alberta, Edmonton, Alberta, Canada.,Alberta Transplant Institute, University of Alberta, Edmonton, Canada
| | - Simon Urschel
- Department of Pediatrics, Stollery Children's Hospital, University of Alberta, Edmonton, Alberta, Canada.,Alberta Transplant Institute, University of Alberta, Edmonton, Canada.,Department of Medical Microbiology and Immunology, University of Alberta, Edmonton, Alberta, Canada
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21
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Gut dysbiosis breaks immunological tolerance toward the central nervous system during young adulthood. Proc Natl Acad Sci U S A 2017; 114:E9318-E9327. [PMID: 29078267 DOI: 10.1073/pnas.1615715114] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
Multiple sclerosis (MS) is an autoimmune disease targeting the central nervous system (CNS) mainly in young adults, and a breakage of immune tolerance to CNS self-antigens has been suggested to initiate CNS autoimmunity. Age and microbial infection are well-known factors involved in the development of autoimmune diseases, including MS. Recent studies have suggested that alterations in the gut microbiota, referred to as dysbiosis, are associated with MS. However, it is still largely unknown how gut dysbiosis affects the onset and progression of CNS autoimmunity. In this study, we investigated the effects of age and gut dysbiosis on the development of CNS autoimmunity in humanized transgenic mice expressing the MS-associated MHC class II (MHC-II) gene, HLA-DR2a, and T-cell receptor (TCR) genes specific for MBP87-99/DR2a that were derived from an MS patient. We show here that the induction of gut dysbiosis triggers the development of spontaneous experimental autoimmune encephalomyelitis (EAE) during adolescence and early young adulthood, while an increase in immunological tolerance with aging suppresses disease onset after late young adulthood in mice. Furthermore, gut dysbiosis induces the expression of complement C3 and production of the anaphylatoxin C3a, and down-regulates the expression of the Foxp3 gene and anergy-related E3 ubiquitin ligase genes. Consequently, gut dysbiosis was able to trigger the development of encephalitogenic T cells and promote the induction of EAE during the age window of young adulthood.
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22
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Beider K, Naor D, Voevoda V, Ostrovsky O, Bitner H, Rosenberg E, Varda-Bloom N, Marcu-Malina V, Canaani J, Danilesko I, Shimoni A, Nagler A. Dissecting the mechanisms involved in anti-human T-lymphocyte immunoglobulin (ATG)-induced tolerance in the setting of allogeneic stem cell transplantation - potential implications for graft versus host disease. Oncotarget 2017; 8:90748-90765. [PMID: 29207601 PMCID: PMC5710882 DOI: 10.18632/oncotarget.21797] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2017] [Accepted: 09/22/2017] [Indexed: 02/06/2023] Open
Abstract
Polyclonal anti-human thymocyte globulins (ATG) have been recently shown to significantly reduce the incidence of graft versus host disease (GVHD) post allogeneic stem cell transplantation (HSCT) from both sibling and unrelated donors. Induction of regulatory T cells has been suggested as one of the possible mechanisms. The aim of current study was to further characterize the T cell populations induced by ATG treatment and to delineate the mechanisms involved in ATG-induced tolerance. Phenotypic characterization revealed a significant increase in the expression of FoxP3, GITR, CD95, PD-1 and ICOS as well as the complement inhibitory molecules CD55, CD58 and CD59 on CD4+CD25+ T cells upon ATG treatment. Addition of ATG-treated cells to autologous and allogeneic peripheral blood mononuclear cells (PBMCs) stimulated with anti-CD3/anti-CD28 antibodies resulted in significant inhibition of proliferation. Moreover, T-cell activation and IFNγ secretion were reduced in the presence of ATG-induced Treg cells. The CD4+CD25+CD127-low Treg fraction sorted from ATG-treated culture demonstrated greater suppressive potency than negative fraction. Conditioned medium produced by ATG-treated but not IgG-treated cells contained TGFβ and suppressed T cell proliferation and activation in a TGFβ receptor-dependent manner. TGFβ receptor kinase inhibitor SB431542 interfered with the suppressive activity of ATG-primed cells, enabling partial rescue of proliferation and IFNγ secretion. Moreover, SB431542 prevented Treg phenotype induction upon ATG treatment. Altogether, our data reveal the role of TGFβ signaling in ATG-mediated immunosuppression and further support the use of ATG, a potent inducer of regulatory T cells, for prevention of GVHD post HSCT and potentially other therapeutic applications.
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Affiliation(s)
- Katia Beider
- Hematology Division, Chaim Sheba Medical Center and Tel Aviv University, Tel-Hashomer, Ramat Gan, Israel
| | - David Naor
- 2 Lautenberg Center for Immunology and Cancer Research, Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
| | - Valeria Voevoda
- Hematology Division, Chaim Sheba Medical Center and Tel Aviv University, Tel-Hashomer, Ramat Gan, Israel
| | - Olga Ostrovsky
- Hematology Division, Chaim Sheba Medical Center and Tel Aviv University, Tel-Hashomer, Ramat Gan, Israel
| | - Hanna Bitner
- Hematology Division, Chaim Sheba Medical Center and Tel Aviv University, Tel-Hashomer, Ramat Gan, Israel
| | - Evgenia Rosenberg
- Hematology Division, Chaim Sheba Medical Center and Tel Aviv University, Tel-Hashomer, Ramat Gan, Israel
| | - Nira Varda-Bloom
- Hematology Division, Chaim Sheba Medical Center and Tel Aviv University, Tel-Hashomer, Ramat Gan, Israel
| | - Victoria Marcu-Malina
- Hematology Division, Chaim Sheba Medical Center and Tel Aviv University, Tel-Hashomer, Ramat Gan, Israel
| | - Jonathan Canaani
- Hematology Division, Chaim Sheba Medical Center and Tel Aviv University, Tel-Hashomer, Ramat Gan, Israel
| | - Ivetta Danilesko
- Hematology Division, Chaim Sheba Medical Center and Tel Aviv University, Tel-Hashomer, Ramat Gan, Israel
| | - Avichai Shimoni
- Hematology Division, Chaim Sheba Medical Center and Tel Aviv University, Tel-Hashomer, Ramat Gan, Israel
| | - Arnon Nagler
- Hematology Division, Chaim Sheba Medical Center and Tel Aviv University, Tel-Hashomer, Ramat Gan, Israel
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23
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Functional heterogeneity of gut-resident regulatory T cells. Clin Transl Immunology 2017; 6:e156. [PMID: 28983404 PMCID: PMC5628268 DOI: 10.1038/cti.2017.39] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2017] [Revised: 07/26/2017] [Accepted: 07/26/2017] [Indexed: 02/07/2023] Open
Abstract
Regulatory T cells (Treg cells) have a central role in the maintenance of intestinal homeostasis by restraining inappropriate immune responses in the healthy gut. Although distinct intestinal immune cell populations have been described to exhibit regulatory activity, several genetic and functional studies provided a strong evidence for a pivotal role of forkhead box P3 (Foxp3)+CD4+ Treg cells in prevention of dysregulated mucosal immune reactions and development of chronic immunological disorders such as celiac disease, food allergies and inflammatory bowel disease. Treg cells provide an important layer of intestinal defense by suppressing immune responses against innocuous food and commensal-derived antigens. Recent functional studies suggest that Treg cells are also involved in several other processes such as controlling microbial diversity in the gut, immunoglobulin A selection and supporting tissue repair in response to intestinal tissue damage. A better understanding of the functional heterogeneity as well as of the molecular signals, which regulate distinct intestinal Treg cell subsets, will encourage strategies aimed at transplanting the optimal Treg cell subset for cellular therapy in humans.
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24
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Shin YW, Lee ST, Park KI, Jung KH, Jung KY, Lee SK, Chu K. Treatment strategies for autoimmune encephalitis. Ther Adv Neurol Disord 2017; 11:1756285617722347. [PMID: 29399043 PMCID: PMC5784571 DOI: 10.1177/1756285617722347] [Citation(s) in RCA: 131] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Accepted: 06/14/2017] [Indexed: 12/13/2022] Open
Abstract
Autoimmune encephalitis is one of the most rapidly growing research topics in neurology. Along with discoveries of novel antibodies associated with the disease, clinical experience and outcomes with diverse immunotherapeutic agents in the treatment of autoimmune encephalitis are accumulating. Retrospective observations indicate that early aggressive treatment is associated with better functional outcomes and fewer relapses. Immune response to first-line immunotherapeutic agents (corticosteroids, intravenous immunoglobulin, plasma exchange, and immunoadsorption) is fair, but approximately half or more of patients are administered second-line immunotherapy (rituximab and cyclophosphamide). A small but significant proportion of patients are refractory to all first- and second-line therapies and require further treatment. Although several investigations have shown promising alternatives, the low absolute number of patients involved necessitates more evidence to establish further treatment strategies. In this review, the agents used for first- and second-line immunotherapy are discussed and recent attempts at finding new treatment options are introduced.
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Affiliation(s)
- Yong-Won Shin
- Department of Neurology, Comprehensive Epilepsy Center, Laboratory for Neurotherapeutics, Biomedical Research Institute, Seoul National University Hospital, Seoul, South Korea Program in Neuroscience, Seoul National University College of Medicine, Seoul, South Korea Yeongjusi Health Center, Gyeongsangbuk-do, South Korea
| | - Soon-Tae Lee
- Department of Neurology, Comprehensive Epilepsy Center, Laboratory for Neurotherapeutics, Biomedical Research Institute, Seoul National University Hospital, Seoul, South Korea Program in Neuroscience, Seoul National University College of Medicine, Seoul, South Korea
| | - Kyung-Il Park
- Department of Neurology, Comprehensive Epilepsy Center, Laboratory for Neurotherapeutics, Biomedical Research Institute, Seoul National University Hospital, Seoul, South Korea Program in Neuroscience, Seoul National University College of Medicine, Seoul, South Korea
| | - Keun-Hwa Jung
- Department of Neurology, Comprehensive Epilepsy Center, Laboratory for Neurotherapeutics, Biomedical Research Institute, Seoul National University Hospital, Seoul, South Korea Program in Neuroscience, Seoul National University College of Medicine, Seoul, South Korea
| | - Ki-Young Jung
- Department of Neurology, Comprehensive Epilepsy Center, Laboratory for Neurotherapeutics, Biomedical Research Institute, Seoul National University Hospital, Seoul, South Korea Program in Neuroscience, Seoul National University College of Medicine, Seoul, South Korea
| | - Sang Kun Lee
- Department of Neurology, Comprehensive Epilepsy Center, Laboratory for Neurotherapeutics, Biomedical Research Institute, Seoul National University Hospital, Seoul, South Korea Program in Neuroscience, Seoul National University College of Medicine, Seoul, South Korea
| | - Kon Chu
- Department of Neurology, Comprehensive Epilepsy Center, Laboratory for Neurotherapeutics, Biomedical Research Institute, Seoul National niversity Hospital, 101, Daehangno, Jongno-gu, Seoul 110-744, South Korea Program in Neuroscience, Seoul National University College of Medicine, Seoul, South Korea
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Abdel-Haleem AM, Lewis NE, Jamshidi N, Mineta K, Gao X, Gojobori T. The Emerging Facets of Non-Cancerous Warburg Effect. Front Endocrinol (Lausanne) 2017; 8:279. [PMID: 29109698 PMCID: PMC5660072 DOI: 10.3389/fendo.2017.00279] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/31/2017] [Accepted: 10/04/2017] [Indexed: 01/07/2023] Open
Abstract
The Warburg effect (WE), or aerobic glycolysis, is commonly recognized as a hallmark of cancer and has been extensively studied for potential anti-cancer therapeutics development. Beyond cancer, the WE plays an important role in many other cell types involved in immunity, angiogenesis, pluripotency, and infection by pathogens (e.g., malaria). Here, we review the WE in non-cancerous context as a "hallmark of rapid proliferation." We observe that the WE operates in rapidly dividing cells in normal and pathological states that are triggered by internal and external cues. Aerobic glycolysis is also the preferred metabolic program in the cases when robust transient responses are needed. We aim to draw attention to the potential of computational modeling approaches in systematic characterization of common metabolic features beyond the WE across physiological and pathological conditions. Identification of metabolic commonalities across various diseases may lead to successful repurposing of drugs and biomarkers.
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Affiliation(s)
- Alyaa M. Abdel-Haleem
- King Abdullah University of Science and Technology (KAUST), Computational Bioscience Research Centre (CBRC), Thuwal, Saudi Arabia
- King Abdullah University of Science and Technology (KAUST), Biological and Environmental Sciences and Engineering (BESE) Division, Thuwal, Saudi Arabia
| | - Nathan E. Lewis
- Novo Nordisk Foundation Center for Biosustainability, University of California San Diego School of Medicine, La Jolla, CA, United States
- Department of Pediatrics, University of California, San Diego, La Jolla, CA, United States
- Department of Bioengineering, University of California, San Diego, La Jolla, CA, United States
| | - Neema Jamshidi
- Institute of Engineering in Medicine, University of California, San Diego, La Jolla, CA, United States
- Department of Radiological Sciences, University of California, Los Angeles, Los Angeles, CA, United States
| | - Katsuhiko Mineta
- King Abdullah University of Science and Technology (KAUST), Computational Bioscience Research Centre (CBRC), Thuwal, Saudi Arabia
- King Abdullah University of Science and Technology (KAUST), Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, Thuwal, Saudi Arabia
| | - Xin Gao
- King Abdullah University of Science and Technology (KAUST), Computational Bioscience Research Centre (CBRC), Thuwal, Saudi Arabia
- King Abdullah University of Science and Technology (KAUST), Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, Thuwal, Saudi Arabia
| | - Takashi Gojobori
- King Abdullah University of Science and Technology (KAUST), Computational Bioscience Research Centre (CBRC), Thuwal, Saudi Arabia
- King Abdullah University of Science and Technology (KAUST), Biological and Environmental Sciences and Engineering (BESE) Division, Thuwal, Saudi Arabia
- *Correspondence: Takashi Gojobori,
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26
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IL-25 attenuates rheumatoid arthritis through suppression of Th17 immune responses in an IL-13-dependent manner. Sci Rep 2016; 6:36002. [PMID: 27812008 PMCID: PMC5095710 DOI: 10.1038/srep36002] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2016] [Accepted: 10/03/2016] [Indexed: 12/29/2022] Open
Abstract
IL-25, a new member of the IL-17 cytokine family, is involved in type 2 immunity initiation and has been associated with the pathogenesis of rheumatoid arthritis (RA). However, its exact role remains unclear. Here, we aimed to analyse IL-25 expression in the serum and synovial fluid of RA patients and evaluated the correlations between serum IL-25 levels, clinical and laboratory values and inflammation cytokines. Additionally, we investigated whether IL-25 can suppress Th1/Th17 responses involved in RA pathogenesis. We further determined whether IL-25 can alleviate collagen-induced arthritis (CIA) development in mice and the underlying mechanisms using in vitro and in vivo experiments. Our results showed that IL-25 was upregulated in the serum and synovial fluid of RA patients. Increased serum IL-25 levels were associated with disease severity and inflammatory response in RA patients. Furthermore, IL-25 inhibited CD4+ T-cell activation and differentiation into Th17 cells, without affecting Th1 cells in human RA and CIA models. Administration of IL-25 could attenuate CIA development by Th17 suppression in an IL-13-dependent manner. Our findings indicate that IL-25 plays a potent immunosuppressive role in the pathogenesis of RA and CIA by downregulating Th17 cell response, and thus, may be a potential therapeutic agent for RA.
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27
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Campisi L, Barbet G, Ding Y, Esplugues E, Flavell RA, Blander JM. Apoptosis in response to microbial infection induces autoreactive TH17 cells. Nat Immunol 2016; 17:1084-92. [PMID: 27455420 PMCID: PMC5079524 DOI: 10.1038/ni.3512] [Citation(s) in RCA: 70] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2016] [Accepted: 06/09/2016] [Indexed: 12/12/2022]
Abstract
Microbial infections often precede the onset of autoimmunity. How infections trigger autoimmunity remains poorly understood. We investigated the possibility that infection might create conditions that allow the stimulatory presentation of self peptides themselves and that this might suffice to elicit autoreactive T cell responses that lead to autoimmunity. Self-reactive CD4(+) T cells are major drivers of autoimmune disease, but their activation is normally prevented through regulatory mechanisms that limit the immunostimulatory presentation of self antigens. Here we found that the apoptosis of infected host cells enabled the presentation of self antigens by major histocompatibility complex class II molecules in an inflammatory context. This was sufficient for the generation of an autoreactive TH17 subset of helper T cells, prominently associated with autoimmune disease. Once induced, the self-reactive TH17 cells promoted auto-inflammation and autoantibody generation. Our findings have implications for how infections precipitate autoimmunity.
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Affiliation(s)
- Laura Campisi
- Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Gaetan Barbet
- Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, New York, USA.,Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Yi Ding
- Department of Pathology, New York University Langone Medical Center, New York, New York, USA
| | - Enric Esplugues
- Department of Immunobiology, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Richard A Flavell
- Department of Immunobiology, Yale University School of Medicine, New Haven, Connecticut, USA
| | - J Magarian Blander
- Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, New York, USA.,Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York, USA.,Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, New York, USA.,Department of Microbiology, Icahn School of Medicine at Mount Sinai, New York, New York, USA
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28
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Lutz MB. Induction of CD4(+) Regulatory and Polarized Effector/helper T Cells by Dendritic Cells. Immune Netw 2016; 16:13-25. [PMID: 26937228 PMCID: PMC4770096 DOI: 10.4110/in.2016.16.1.13] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2015] [Revised: 01/15/2016] [Accepted: 01/18/2016] [Indexed: 12/12/2022] Open
Abstract
Dendritic cells (DCs) are considered to play major roles during the induction of T cell immune responses as well as the maintenance of T cell tolerance. Naive CD4(+) T cells have been shown to respond with high plasticity to signals inducing their polarization into effector/helper or regulatory T cells. Data obtained from in vitro generated bone-marrow (BM)-derived DCs as well as genetic mouse models revealed an important but not exclusive role of DCs in shaping CD4(+) T cell responses. Besides the specialization of some conventional DC subsets for the induction of polarized immunity, also the maturation stage, activation of specialized transcription factors and the cytokine production of DCs have major impact on CD4(+) T cells. Since in vitro generated BM-DCs show a high diversity to shape CD4(+) T cells and their high similarity to monocyte-derived DCs in vivo, this review reports data mainly on BM-DCs in this process and only touches the roles of transcription factors or of DC subsets, which have been discussed elsewhere. Here, recent findings on 1) the conversion of naive into anergic and further into Foxp3(-) regulatory T cells (Treg) by immature DCs, 2) the role of RelB in steady state migratory DCs (ssmDCs) for conversion of naive T cells into Foxp3(+) Treg, 3) the DC maturation signature for polarized Th2 cell induction and 4) the DC source of IL-12 for Th1 induction are discussed.
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Affiliation(s)
- Manfred B Lutz
- Institute of Virology and Immunobiology, University of Würzburg, 97078 Würzburg, Germany
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29
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Zhang D, Tu E, Kasagi S, Zanvit P, Chen Q, Chen W. Manipulating regulatory T cells: a promising strategy to treat autoimmunity. Immunotherapy 2015; 7:1201-11. [PMID: 26568117 DOI: 10.2217/imt.15.79] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
CD4(+)CD25(+)Foxp3(+)regulatory T cells (Treg cells) are extremely important in maintaining immune tolerance. Manipulation of Treg cells, especially autoantigen-specific Treg cells is a promising approach for treatments of autoimmune disease since Treg cells may provide the advantage of antigen specificity without overall immune suppression. However, the clinical application of Treg cells has long been limited due to low numbers of Treg cells and the difficulty in identifying their antigen specificity. In this review, we summarize studies that demonstrate regression of autoimmune diseases using Treg cells as therapeutics. We also discuss approaches to generate polyclonal and autoantigen-specific Treg cells in vitro and in vivo. We also discuss our recent study that describes a novel approach of generating autoantigen-specific Treg cells in vivo and restoring immune tolerance by two steps apoptosis-antigen therapy.
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Affiliation(s)
- Dunfang Zhang
- Mucosal Immunology Section, OPCB, National Institute of Dental & Craniofacial Research, NIH, Bethesda, MD 20892, USA.,State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan 610041, China
| | - Eric Tu
- Mucosal Immunology Section, OPCB, National Institute of Dental & Craniofacial Research, NIH, Bethesda, MD 20892, USA
| | - Shimpei Kasagi
- Mucosal Immunology Section, OPCB, National Institute of Dental & Craniofacial Research, NIH, Bethesda, MD 20892, USA
| | - Peter Zanvit
- Mucosal Immunology Section, OPCB, National Institute of Dental & Craniofacial Research, NIH, Bethesda, MD 20892, USA
| | - Qianming Chen
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan 610041, China
| | - WanJun Chen
- Mucosal Immunology Section, OPCB, National Institute of Dental & Craniofacial Research, NIH, Bethesda, MD 20892, USA
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30
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Differences in Expression Level of Helios and Neuropilin-1 Do Not Distinguish Thymus-Derived from Extrathymically-Induced CD4+Foxp3+ Regulatory T Cells. PLoS One 2015; 10:e0141161. [PMID: 26495986 PMCID: PMC4619666 DOI: 10.1371/journal.pone.0141161] [Citation(s) in RCA: 123] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2015] [Accepted: 10/05/2015] [Indexed: 12/15/2022] Open
Abstract
Helios transcription factor and semaphorin receptor Nrp-1 were originally described as constitutively expressed at high levels on CD4+Foxp3+ T regulatory cells of intrathymic origin (tTregs). On the other hand, CD4+Foxp3+ Tregs generated in the periphery (pTregs) or induced ex vivo (iTregs) were reported to express low levels of Helios and Nrp-1. Soon afterwards the reliability of Nrp-1 and Helios as markers discriminating between tTregs and pTregs was questioned and until now no consensus has been reached. Here, we used several genetically modified mouse strains that favor pTregs or tTregs formation and analyzed the TCR repertoire of these cells. We found that Tregs with variable levels of Nrp-1 and Helios were abundant in mice with compromised ability to support natural differentiation of tTregs or pTregs. We also report that TCR repertoires of Treg clones expressing high or low levels of Nrp-1 or Helios are similar and more alike repertoire of CD4+Foxp3+ than repertoire of CD4+Foxp3- thymocytes. These results show that high vs. low expression of Nrp-1 or Helios does not unequivocally identify Treg clones of thymic or peripheral origin.
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31
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Zhang H, Guo H, Lu L, Zahorchak AF, Wiseman RW, Raimondi G, Cooper DKC, Ezzelarab MB, Thomson AW. Sequential monitoring and stability of ex vivo-expanded autologous and nonautologous regulatory T cells following infusion in nonhuman primates. Am J Transplant 2015; 15:1253-66. [PMID: 25783759 PMCID: PMC4773915 DOI: 10.1111/ajt.13113] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2014] [Revised: 10/24/2014] [Accepted: 11/17/2014] [Indexed: 01/25/2023]
Abstract
Ex vivo-expanded cynomolgus monkey CD4(+)CD25(+)CD127(-) regulatory T cells (Treg) maintained Foxp3 demethylation status at the Treg-specific demethylation region, and potently suppressed T cell proliferation through three rounds of expansion. When carboxyfluorescein succinimidyl ester- or violet proliferation dye 450-labeled autologous (auto) and nonautologous (non-auto)-expanded Treg were infused into monkeys, the number of labeled auto-Treg in peripheral blood declined rapidly during the first week, but persisted at low levels in both normal and anti-thymocyte globulin plus rapamycin-treated (immunosuppressed; IS) animals for at least 3 weeks. By contrast, MHC-mismatched non-auto-Treg could not be detected in normal monkey blood or in blood of two out of the three IS monkeys by day 6 postinfusion. They were also more difficult to detect than auto-Treg in peripheral lymphoid tissue. Both auto- and non-auto-Treg maintained Ki67 expression early after infusion. Sequential monitoring revealed that adoptively transferred auto-Treg maintained similarly high levels of Foxp3 and CD25 and low CD127 compared with endogenous Treg, although Foxp3 staining diminished over time in these nontransplanted recipients. Thus, infused ex vivo-expanded auto-Treg persist longer than MHC-mismatched non-auto-Treg in blood of nonhuman primates and can be detected in secondary lymphoid tissue. Host lymphodepletion and rapamycin administration did not consistently prolong the persistence of non-auto-Treg in these sites.
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Affiliation(s)
- H. Zhang
- Thomas E. Starzl Transplantation Institute, Department of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA
| | - H. Guo
- Thomas E. Starzl Transplantation Institute, Department of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA
| | - L. Lu
- Thomas E. Starzl Transplantation Institute, Department of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA
| | - A. F. Zahorchak
- Thomas E. Starzl Transplantation Institute, Department of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA
| | - R. W. Wiseman
- Wisconsin National Primate Research Center, University of Wisconsin-Madison, Madison, WI
| | - G. Raimondi
- Thomas E. Starzl Transplantation Institute, Department of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, Department of Immunology, University of Pittsburgh School of Medicine, Pittsburgh, PA
| | - D. K. C. Cooper
- Thomas E. Starzl Transplantation Institute, Department of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA
| | - M. B. Ezzelarab
- Thomas E. Starzl Transplantation Institute, Department of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA
| | - A. W. Thomson
- Thomas E. Starzl Transplantation Institute, Department of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, Department of Immunology, University of Pittsburgh School of Medicine, Pittsburgh, PA,Corresponding author: Angus W. Thomson,
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32
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Klatzmann D, Abbas AK. The promise of low-dose interleukin-2 therapy for autoimmune and inflammatory diseases. Nat Rev Immunol 2015; 15:283-94. [PMID: 25882245 DOI: 10.1038/nri3823] [Citation(s) in RCA: 428] [Impact Index Per Article: 47.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Depletion of regulatory T (TReg) cells in otherwise healthy individuals leads to multi-organ autoimmune disease and inflammation. This indicates that in a normal immune system, there are self-specific effector T cells that are ready to attack normal tissue if they are not restrained by TReg cells. The data imply that there is a balance between effector T cells and TReg cells in health and suggest a therapeutic potential of TReg cells in diseases in which this balance is altered. Proof-of-concept clinical trials, now supported by robust mechanistic studies, have shown that low-dose interleukin-2 specifically expands and activates TReg cell populations and thus can control autoimmune diseases and inflammation.
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Affiliation(s)
- David Klatzmann
- 1] Sorbonne Université, UPMC Univ Paris 06, UMRS 959, Immunology-Immunopathology-Immunotherapy (i3), F-75651 Paris, France. [2] INSERM, UMRS 959, Immunology-Immunopathology-Immunotherapy (i3), F-75005 Paris, France. [3] Assistance Publique - Hôpitaux de Paris, Hôpital Pitié-Salpêtrière, Biotherapy and Département Hospitalo-Universitaire Inflammation-Immunopathology-Biotherapy (i2B), F-75651 Paris, France
| | - Abul K Abbas
- Department of Pathology, University of California San Francisco, California 94143-0511, USA
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33
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Rosenthal KS, Mikecz K, Steiner HL, Glant TT, Finnegan A, Carambula RE, Zimmerman DH. Rheumatoid arthritis vaccine therapies: perspectives and lessons from therapeutic ligand epitope antigen presentation system vaccines for models of rheumatoid arthritis. Expert Rev Vaccines 2015; 14:891-908. [PMID: 25787143 DOI: 10.1586/14760584.2015.1026330] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The current status of therapeutic vaccines for autoimmune diseases is reviewed with rheumatoid arthritis as the focus. Therapeutic vaccines for autoimmune diseases must regulate or subdue responses to common self-antigens. Ideally, such a vaccine would initiate an antigen-specific modulation of the T-cell immune response that drives the inflammatory disease. Appropriate animal models and types of T helper cells and signature cytokine responses that drive autoimmune disease are also discussed. Interpretation of these animal models must be done cautiously because the means of initiation, autoantigens, and even the signature cytokine and T helper cell (Th1 or Th17) responses that are involved in the disease may differ significantly from those in humans. We describe ligand epitope antigen presentation system vaccine modulation of T-cell autoimmune responses as a strategy for the design of therapeutic vaccines for rheumatoid arthritis, which may also be effective in other autoimmune conditions.
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34
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Kasagi S, Zhang P, Che L, Abbatiello B, Maruyama T, Nakatsukasa H, Zanvit P, Jin W, Konkel JE, Chen W. In vivo-generated antigen-specific regulatory T cells treat autoimmunity without compromising antibacterial immune response. Sci Transl Med 2015; 6:241ra78. [PMID: 24944193 DOI: 10.1126/scitranslmed.3008895] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Harnessing regulatory T (Treg) cells is a promising approach for treating autoimmune disease. However, inducing antigen-specific Treg cells that target inflammatory immune cells without compromising beneficial immune responses has remained an unmet challenge. We developed a pathway to generate autoantigen-specific Treg cells in vivo, which showed therapeutic effects on experimental autoimmune encephalomyelitis and nonobese diabetes in mice. Specifically, we induced apoptosis of immune cells by systemic sublethal irradiation or depleted B and CD8(+) T cells with specific antibodies and then administered autoantigenic peptides in mice with established autoimmune diseases. We demonstrated mechanistically that apoptotic cells triggered professional phagocytes to produce transforming growth factor-β, under which the autoantigenic peptides directed naïve CD4(+) T cells to differentiate into Foxp3(+) Treg cells instead of into T effector cells in vivo. These antigen-specific Treg cells specifically ameliorated autoimmunity without compromising immune responses to bacterial antigen. We have thus successfully generated antigen-specific Treg cells with therapeutic activity toward autoimmunity. The findings may lead to the development of antigen-specific Treg cell-mediated immunotherapy for multiple sclerosis and type 1 diabetes and also other autoimmune diseases.
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Affiliation(s)
- Shimpei Kasagi
- Mucosal Immunology Section, Oral Pharyngeal Cancer Branch, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, MD 20892, USA
| | - Pin Zhang
- Mucosal Immunology Section, Oral Pharyngeal Cancer Branch, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, MD 20892, USA
| | - Li Che
- Mucosal Immunology Section, Oral Pharyngeal Cancer Branch, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, MD 20892, USA
| | - Brittany Abbatiello
- Mucosal Immunology Section, Oral Pharyngeal Cancer Branch, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, MD 20892, USA
| | - Takashi Maruyama
- Mucosal Immunology Section, Oral Pharyngeal Cancer Branch, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, MD 20892, USA
| | - Hiroko Nakatsukasa
- Mucosal Immunology Section, Oral Pharyngeal Cancer Branch, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, MD 20892, USA
| | - Peter Zanvit
- Mucosal Immunology Section, Oral Pharyngeal Cancer Branch, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, MD 20892, USA
| | - Wenwen Jin
- Mucosal Immunology Section, Oral Pharyngeal Cancer Branch, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, MD 20892, USA
| | - Joanne E Konkel
- Mucosal Immunology Section, Oral Pharyngeal Cancer Branch, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, MD 20892, USA
| | - WanJun Chen
- Mucosal Immunology Section, Oral Pharyngeal Cancer Branch, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, MD 20892, USA.
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35
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TRAIL modulates the immune system and protects against the development of diabetes. J Immunol Res 2015; 2015:680749. [PMID: 25759846 PMCID: PMC4352427 DOI: 10.1155/2015/680749] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2014] [Accepted: 02/02/2015] [Indexed: 01/10/2023] Open
Abstract
TRAIL or tumor necrosis factor (TNF) related apoptosis-inducing ligand is a member of the TNF superfamily of proteins, whose best characterized function is the induction of apoptosis in tumor, infected, or transformed cells through activation of specific receptors. In nontransformed cells, however, the actions of TRAIL are less well characterized. Recent studies suggest that TRAIL may be implicated in the development and progression of diabetes. Here we review TRAIL biological actions, its effects on the immune system, and how and to what extent it has been shown to protect against diabetes.
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36
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Ito Y, Hashimoto M, Hirota K, Ohkura N, Morikawa H, Nishikawa H, Tanaka A, Furu M, Ito H, Fujii T, Nomura T, Yamazaki S, Morita A, Vignali DAA, Kappler JW, Matsuda S, Mimori T, Sakaguchi N, Sakaguchi S. Detection of T cell responses to a ubiquitous cellular protein in autoimmune disease. Science 2014; 346:363-8. [PMID: 25324392 DOI: 10.1126/science.1259077] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
T cells that mediate autoimmune diseases such as rheumatoid arthritis (RA) are difficult to characterize because they are likely to be deleted or inactivated in the thymus if the self antigens they recognize are ubiquitously expressed. One way to obtain and analyze these autoimmune T cells is to alter T cell receptor (TCR) signaling in developing T cells to change their sensitivity to thymic negative selection, thereby allowing their thymic production. From mice thus engineered to generate T cells mediating autoimmune arthritis, we isolated arthritogenic TCRs and characterized the self antigens they recognized. One of them was the ubiquitously expressed 60S ribosomal protein L23a (RPL23A), with which T cells and autoantibodies from RA patients reacted. This strategy may improve our understanding of the underlying drivers of autoimmunity.
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Affiliation(s)
- Yoshinaga Ito
- Department of Experimental Pathology, Institute for Frontier Medical Sciences, Kyoto University, Kyoto 606-8507, Japan
| | - Motomu Hashimoto
- Department of Experimental Pathology, Institute for Frontier Medical Sciences, Kyoto University, Kyoto 606-8507, Japan. Department of Experimental Immunology, Immunology Frontier Research Center, Osaka University, Suita 565-0871, Japan. Department of the Control for Rheumatic Diseases, Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan. Department of Rheumatology and Clinical Immunology, Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan
| | - Keiji Hirota
- Department of Experimental Immunology, Immunology Frontier Research Center, Osaka University, Suita 565-0871, Japan
| | - Naganari Ohkura
- Department of Experimental Immunology, Immunology Frontier Research Center, Osaka University, Suita 565-0871, Japan. Department of Frontier Research in Tumor Immunology, Center of Medical Innovation and Translational Research, Osaka University, Osaka 565-0871, Japan
| | - Hiromasa Morikawa
- Department of Experimental Immunology, Immunology Frontier Research Center, Osaka University, Suita 565-0871, Japan
| | - Hiroyoshi Nishikawa
- Department of Experimental Immunology, Immunology Frontier Research Center, Osaka University, Suita 565-0871, Japan
| | - Atsushi Tanaka
- Department of Experimental Immunology, Immunology Frontier Research Center, Osaka University, Suita 565-0871, Japan. Department of Frontier Research in Tumor Immunology, Center of Medical Innovation and Translational Research, Osaka University, Osaka 565-0871, Japan
| | - Moritoshi Furu
- Department of the Control for Rheumatic Diseases, Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan. Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan
| | - Hiromu Ito
- Department of the Control for Rheumatic Diseases, Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan. Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan
| | - Takao Fujii
- Department of the Control for Rheumatic Diseases, Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan. Department of Rheumatology and Clinical Immunology, Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan
| | - Takashi Nomura
- Department of Experimental Pathology, Institute for Frontier Medical Sciences, Kyoto University, Kyoto 606-8507, Japan
| | - Sayuri Yamazaki
- Department of Geriatric and Environmental Dermatology, Graduate School of Medical Sciences, Nagoya City University, Nagoya 467-8601, Japan
| | - Akimichi Morita
- Department of Geriatric and Environmental Dermatology, Graduate School of Medical Sciences, Nagoya City University, Nagoya 467-8601, Japan
| | - Dario A A Vignali
- Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA. Department of Immunology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
| | - John W Kappler
- Integrated Department of Immunology, National Jewish Health, Denver, CO 80206, USA. Howard Hughes Medical Institute, National Jewish Health, Denver, CO 80206, USA
| | - Shuichi Matsuda
- Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan
| | - Tsuneyo Mimori
- Department of Rheumatology and Clinical Immunology, Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan
| | - Noriko Sakaguchi
- Department of Experimental Immunology, Immunology Frontier Research Center, Osaka University, Suita 565-0871, Japan
| | - Shimon Sakaguchi
- Department of Experimental Pathology, Institute for Frontier Medical Sciences, Kyoto University, Kyoto 606-8507, Japan. Department of Experimental Immunology, Immunology Frontier Research Center, Osaka University, Suita 565-0871, Japan. Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency, Tokyo 102-0075, Japan.
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Gur-Wahnon D, Mizrachi T, Wald-Altman S, Higazi AAR, Brenner T. Tissue plasminogen activator involvement in experimental autoimmune myasthenia gravis: Aggravation and therapeutic potential. J Autoimmun 2014; 52:36-43. [DOI: 10.1016/j.jaut.2013.12.017] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2013] [Accepted: 12/12/2013] [Indexed: 02/01/2023]
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Mohanta SK, Yin C, Peng L, Srikakulapu P, Bontha V, Hu D, Weih F, Weber C, Gerdes N, Habenicht AJ. Artery Tertiary Lymphoid Organs Contribute to Innate and Adaptive Immune Responses in Advanced Mouse Atherosclerosis. Circ Res 2014; 114:1772-87. [DOI: 10.1161/circresaha.114.301137] [Citation(s) in RCA: 81] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Tertiary lymphoid organs emerge in tissues in response to nonresolving inflammation. Recent research characterized artery tertiary lymphoid organs in the aorta adventitia of aged apolipoprotein E–deficient mice. The atherosclerosis-associated lymphocyte aggregates are organized into distinct compartments, including separate T-cell areas harboring conventional, monocyte-derived, lymphoid, and plasmacytoid dendritic cells, as well as activated T-cell effectors and memory cells; B-cell follicles containing follicular dendritic cells in activated germinal centers; and peripheral niches of plasma cells. Artery tertiary lymphoid organs show marked neoangiogenesis, aberrant lymphangiogenesis, and extensive induction of high endothelial venules. Moreover, newly formed lymph node–like conduits connect the external lamina with high endothelial venules in T-cell areas and also extend into germinal centers. Mouse artery tertiary lymphoid organs recruit large numbers of naïve T cells and harbor lymphocyte subsets with opposing activities, including CD4
+
and CD8
+
effector and memory T cells, natural and induced CD4
+
regulatory T cells, and memory B cells at different stages of differentiation. These data suggest that artery tertiary lymphoid organs participate in primary immune responses and organize T- and B-cell autoimmune responses in advanced atherosclerosis. In this review, we discuss the novel concept that pro- and antiatherogenic immune responses toward unknown arterial wall–derived autoantigens may be organized by artery tertiary lymphoid organs and that disruption of the balance between pro- and antiatherogenic immune cell subsets may trigger clinically overt atherosclerosis.
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Affiliation(s)
- Sarajo Kumar Mohanta
- From the Institute for Cardiovascular Prevention, Ludwig-Maximilians-University, Munich, Germany (S.K.M., C.Y., C.W., N.G., A.J.R.H.); Leibniz Institute for Age Research, Fritz Lipmann Institute, Jena, Germany (L.P., P.S., V.B., F.W.); and Institute of Molecular Immunology, Helmholtz Center Munich, Neuherberg, Germany (D.H.)
| | - Changjun Yin
- From the Institute for Cardiovascular Prevention, Ludwig-Maximilians-University, Munich, Germany (S.K.M., C.Y., C.W., N.G., A.J.R.H.); Leibniz Institute for Age Research, Fritz Lipmann Institute, Jena, Germany (L.P., P.S., V.B., F.W.); and Institute of Molecular Immunology, Helmholtz Center Munich, Neuherberg, Germany (D.H.)
| | - Li Peng
- From the Institute for Cardiovascular Prevention, Ludwig-Maximilians-University, Munich, Germany (S.K.M., C.Y., C.W., N.G., A.J.R.H.); Leibniz Institute for Age Research, Fritz Lipmann Institute, Jena, Germany (L.P., P.S., V.B., F.W.); and Institute of Molecular Immunology, Helmholtz Center Munich, Neuherberg, Germany (D.H.)
| | - Prasad Srikakulapu
- From the Institute for Cardiovascular Prevention, Ludwig-Maximilians-University, Munich, Germany (S.K.M., C.Y., C.W., N.G., A.J.R.H.); Leibniz Institute for Age Research, Fritz Lipmann Institute, Jena, Germany (L.P., P.S., V.B., F.W.); and Institute of Molecular Immunology, Helmholtz Center Munich, Neuherberg, Germany (D.H.)
| | - Vineela Bontha
- From the Institute for Cardiovascular Prevention, Ludwig-Maximilians-University, Munich, Germany (S.K.M., C.Y., C.W., N.G., A.J.R.H.); Leibniz Institute for Age Research, Fritz Lipmann Institute, Jena, Germany (L.P., P.S., V.B., F.W.); and Institute of Molecular Immunology, Helmholtz Center Munich, Neuherberg, Germany (D.H.)
| | - Desheng Hu
- From the Institute for Cardiovascular Prevention, Ludwig-Maximilians-University, Munich, Germany (S.K.M., C.Y., C.W., N.G., A.J.R.H.); Leibniz Institute for Age Research, Fritz Lipmann Institute, Jena, Germany (L.P., P.S., V.B., F.W.); and Institute of Molecular Immunology, Helmholtz Center Munich, Neuherberg, Germany (D.H.)
| | - Falk Weih
- From the Institute for Cardiovascular Prevention, Ludwig-Maximilians-University, Munich, Germany (S.K.M., C.Y., C.W., N.G., A.J.R.H.); Leibniz Institute for Age Research, Fritz Lipmann Institute, Jena, Germany (L.P., P.S., V.B., F.W.); and Institute of Molecular Immunology, Helmholtz Center Munich, Neuherberg, Germany (D.H.)
| | - Christian Weber
- From the Institute for Cardiovascular Prevention, Ludwig-Maximilians-University, Munich, Germany (S.K.M., C.Y., C.W., N.G., A.J.R.H.); Leibniz Institute for Age Research, Fritz Lipmann Institute, Jena, Germany (L.P., P.S., V.B., F.W.); and Institute of Molecular Immunology, Helmholtz Center Munich, Neuherberg, Germany (D.H.)
| | - Norbert Gerdes
- From the Institute for Cardiovascular Prevention, Ludwig-Maximilians-University, Munich, Germany (S.K.M., C.Y., C.W., N.G., A.J.R.H.); Leibniz Institute for Age Research, Fritz Lipmann Institute, Jena, Germany (L.P., P.S., V.B., F.W.); and Institute of Molecular Immunology, Helmholtz Center Munich, Neuherberg, Germany (D.H.)
| | - Andreas J.R. Habenicht
- From the Institute for Cardiovascular Prevention, Ludwig-Maximilians-University, Munich, Germany (S.K.M., C.Y., C.W., N.G., A.J.R.H.); Leibniz Institute for Age Research, Fritz Lipmann Institute, Jena, Germany (L.P., P.S., V.B., F.W.); and Institute of Molecular Immunology, Helmholtz Center Munich, Neuherberg, Germany (D.H.)
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Komatsu N, Okamoto K, Sawa S, Nakashima T, Oh-hora M, Kodama T, Tanaka S, Bluestone JA, Takayanagi H. Pathogenic conversion of Foxp3+ T cells into TH17 cells in autoimmune arthritis. Nat Med 2013; 20:62-8. [PMID: 24362934 DOI: 10.1038/nm.3432] [Citation(s) in RCA: 810] [Impact Index Per Article: 73.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2013] [Accepted: 11/19/2013] [Indexed: 12/12/2022]
Abstract
Autoimmune diseases often result from an imbalance between regulatory T (Treg) cells and interleukin-17 (IL-17)-producing T helper (TH17) cells; the origin of the latter cells remains largely unknown. Foxp3 is indispensable for the suppressive function of Treg cells, but the stability of Foxp3 has been under debate. Here we show that TH17 cells originating from Foxp3(+) T cells have a key role in the pathogenesis of autoimmune arthritis. Under arthritic conditions, CD25(lo)Foxp3(+)CD4(+) T cells lose Foxp3 expression (herein called exFoxp3 cells) and undergo transdifferentiation into TH17 cells. Fate mapping analysis showed that IL-17-expressing exFoxp3 T (exFoxp3 TH17) cells accumulated in inflamed joints. The conversion of Foxp3(+)CD4(+) T cells to TH17 cells was mediated by synovial fibroblast-derived IL-6. These exFoxp3 TH17 cells were more potent osteoclastogenic T cells than were naive CD4(+) T cell-derived TH17 cells. Notably, exFoxp3 TH17 cells were characterized by the expression of Sox4, chemokine (C-C motif) receptor 6 (CCR6), chemokine (C-C motif) ligand 20 (CCL20), IL-23 receptor (IL-23R) and receptor activator of NF-κB ligand (RANKL, also called TNFSF11). Adoptive transfer of autoreactive, antigen-experienced CD25(lo)Foxp3(+)CD4(+) T cells into mice followed by secondary immunization with collagen accelerated the onset and increased the severity of arthritis and was associated with the loss of Foxp3 expression in the majority of transferred T cells. We observed IL-17(+)Foxp3(+) T cells in the synovium of subjects with active rheumatoid arthritis (RA), which suggests that plastic Foxp3(+) T cells contribute to the pathogenesis of RA. These findings establish the pathological importance of Foxp3 instability in the generation of pathogenic TH17 cells in autoimmunity.
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Affiliation(s)
- Noriko Komatsu
- 1] Department of Immunology, Graduate School of Medicine and Faculty of Medicine, The University of Tokyo, Bunkyo-ku, Tokyo, Japan. [2] Japan Science and Technology Agency (JST), Exploratory Research for Advanced Technology (ERATO) Program, Takayanagi Osteonetwork Project, Bunkyo-ku, Tokyo, Japan
| | - Kazuo Okamoto
- 1] Department of Immunology, Graduate School of Medicine and Faculty of Medicine, The University of Tokyo, Bunkyo-ku, Tokyo, Japan. [2] Japan Science and Technology Agency (JST), Exploratory Research for Advanced Technology (ERATO) Program, Takayanagi Osteonetwork Project, Bunkyo-ku, Tokyo, Japan
| | - Shinichiro Sawa
- 1] Department of Immunology, Graduate School of Medicine and Faculty of Medicine, The University of Tokyo, Bunkyo-ku, Tokyo, Japan. [2] Japan Science and Technology Agency (JST), Exploratory Research for Advanced Technology (ERATO) Program, Takayanagi Osteonetwork Project, Bunkyo-ku, Tokyo, Japan
| | - Tomoki Nakashima
- 1] Japan Science and Technology Agency (JST), Exploratory Research for Advanced Technology (ERATO) Program, Takayanagi Osteonetwork Project, Bunkyo-ku, Tokyo, Japan. [2] Department of Cell Signaling, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo, Japan. [3] JST, Precursory Research for Embryonic Science and Technology Program, Bunkyo-ku, Tokyo, Japan
| | - Masatsugu Oh-hora
- 1] Department of Cell Signaling, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo, Japan. [2] JST, Precursory Research for Embryonic Science and Technology Program, Bunkyo-ku, Tokyo, Japan. [3] Global Center of Excellence (GCOE) Program, International Research Center for Molecular Science in Tooth and Bone Diseases, Bunkyo-ku, Tokyo, Japan
| | - Tatsuhiko Kodama
- Laboratory for Systems Biology and Medicine, Research Center for Advanced Science and Technology, The University of Tokyo, Meguro-ku, Tokyo, Japan
| | - Sakae Tanaka
- Department of Orthopaedic Surgery, Faculty of Medicine, The University of Tokyo, Tokyo, Japan
| | - Jeffrey A Bluestone
- Diabetes Center, University of California, San Francisco, San Francisco, California, USA
| | - Hiroshi Takayanagi
- 1] Department of Immunology, Graduate School of Medicine and Faculty of Medicine, The University of Tokyo, Bunkyo-ku, Tokyo, Japan. [2] Japan Science and Technology Agency (JST), Exploratory Research for Advanced Technology (ERATO) Program, Takayanagi Osteonetwork Project, Bunkyo-ku, Tokyo, Japan. [3] Centre for Orthopaedic Research, School of Surgery, The University of Western Australia, Nedlands, Western Australia, Australia
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Ex vivo expanded human regulatory T cells can prolong survival of a human islet allograft in a humanized mouse model. Transplantation 2013; 96:707-16. [PMID: 23917725 PMCID: PMC3864182 DOI: 10.1097/tp.0b013e31829fa271] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
BACKGROUND Human regulatory T cells (Treg) offer an attractive adjunctive therapy to reduce current reliance on lifelong, nonspecific immunosuppression after transplantation. Here, we evaluated the ability of ex vivo expanded human Treg to prevent the rejection of islets of Langerhans in a humanized mouse model and examined the mechanisms involved. METHODS We engrafted human pancreatic islets of Langerhans into the renal subcapsular space of immunodeficient BALB/c.rag2(-/-).cγ(-/-) mice, previously rendered diabetic via injection of the β-cell toxin streptozocin. After the establishment of stable euglycemia, mice were reconstituted with allogeneic human peripheral blood mononuclear cells (PBMC) and the resultant alloreactive response studied. Ex vivo expanded CD25high CD4+ human Treg, which expressed FoxP3, CTLA-4, and CD62L and remained CD127low, were then cotransferred together with human PBMC and islet allografts and monitored for evidence of rejection. RESULTS Human islets transplanted into diabetic immunodeficient mice reversed diabetes but were rejected rapidly after the mice were reconstituted with allogeneic human PBMC. Cotransfer of purified, ex vivo expanded human Treg prolonged islet allograft survival resulting in the accumulation of Treg in the peripheral lymphoid tissue and suppression of proliferation and interferon-γ production by T cells. In vitro, Treg suppressed activation of signal transducers and activators of transcription and inhibited the effector differentiation of responder T cells. CONCLUSIONS Ex vivo expanded Treg retain regulatory activity in vivo, can protect a human islet allograft from rejection by suppressing signal transducers and activators of transcription activation and inhibiting T-cell differentiation, and have clinical potential as an adjunctive cellular therapy.
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41
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Multiparameter single-cell profiling of human CD4+FOXP3+ regulatory T-cell populations in homeostatic conditions and during graft-versus-host disease. Blood 2013; 122:1802-12. [DOI: 10.1182/blood-2013-02-482539] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Key Points
Single-cell heterogeneity, rather than lineage reprogramming, explains the remarkable complexity and functional diversity of human Tregs. Altered homeostasis of Treg subpopulations in patients developing acute graft-versus-host disease.
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42
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Abstract
CD4+Foxp3+ T regulatory (Treg) cells control many facets of immune responses ranging from autoimmune diseases, to inflammatory conditions, and cancer in an attempt to maintain immune homeostasis. Natural Treg (nTreg) cells develop in the thymus and constitute a critical arm of active mechanisms of peripheral tolerance particularly to self antigens. A growing body of knowledge now supports the existence of induced Treg (iTreg) cells which may derive from a population of conventional CD4+ T cells. The fork-head transcription factor (Foxp3) typically is expressed by natural CD4+ Treg cells, and thus serves as a marker to definitively identify these cells. On the contrary, there is less consensus on what constitutes iTreg cells as their precise definition has been somewhat elusive. This is in part due to their distinct phenotypes which are shaped by exposure to certain inflammatory or "assault" signals stemming from the underlying immune disorder. The "policing" activity of Treg cells tends to be uni-directional in several pathological conditions. On one end of the spectrum, Treg cell suppressive activity is beneficial by curtailing T cell response against self-antigens and allergens thus preventing autoimmune diseases and allergies. On the other end however, their inhibitory roles in limiting immune response against pseudo-self antigens as in tumors often culminates into negative outcomes. In this review, we focus on this latter aspect of Treg cell immunobiology by highlighting the involvement of nTreg cells in various animal models and human tumors. We further discuss iTreg cells, relationship with their natural counterpart, and potential co-operation between the two in modulating immune response against tumors. Lastly, we discuss studies focusing on these cells as targets for improving anti-tumor immunity.
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Affiliation(s)
- Dennis O Adeegbe
- Experimental Immunology, Immunology Frontier Research Center, Osaka University , Suita , Japan
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43
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Adeegbe DO, Nishikawa H. Natural and induced T regulatory cells in cancer. Front Immunol 2013; 4:190. [PMID: 23874336 PMCID: PMC3708155 DOI: 10.3389/fimmu.2013.00190] [Citation(s) in RCA: 185] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2013] [Accepted: 06/27/2013] [Indexed: 12/13/2022] Open
Abstract
CD4+Foxp3+ T regulatory (Treg) cells control many facets of immune responses ranging from autoimmune diseases, to inflammatory conditions, and cancer in an attempt to maintain immune homeostasis. Natural Treg (nTreg) cells develop in the thymus and constitute a critical arm of active mechanisms of peripheral tolerance particularly to self antigens. A growing body of knowledge now supports the existence of induced Treg (iTreg) cells which may derive from a population of conventional CD4+ T cells. The fork-head transcription factor (Foxp3) typically is expressed by natural CD4+ Treg cells, and thus serves as a marker to definitively identify these cells. On the contrary, there is less consensus on what constitutes iTreg cells as their precise definition has been somewhat elusive. This is in part due to their distinct phenotypes which are shaped by exposure to certain inflammatory or “assault” signals stemming from the underlying immune disorder. The “policing” activity of Treg cells tends to be uni-directional in several pathological conditions. On one end of the spectrum, Treg cell suppressive activity is beneficial by curtailing T cell response against self-antigens and allergens thus preventing autoimmune diseases and allergies. On the other end however, their inhibitory roles in limiting immune response against pseudo-self antigens as in tumors often culminates into negative outcomes. In this review, we focus on this latter aspect of Treg cell immunobiology by highlighting the involvement of nTreg cells in various animal models and human tumors. We further discuss iTreg cells, relationship with their natural counterpart, and potential co-operation between the two in modulating immune response against tumors. Lastly, we discuss studies focusing on these cells as targets for improving anti-tumor immunity.
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Affiliation(s)
- Dennis O Adeegbe
- Experimental Immunology, Immunology Frontier Research Center, Osaka University , Suita , Japan
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44
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Alatrash G, Jakher H, Stafford PD, Mittendorf EA. Cancer immunotherapies, their safety and toxicity. Expert Opin Drug Saf 2013; 12:631-45. [DOI: 10.1517/14740338.2013.795944] [Citation(s) in RCA: 92] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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45
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Myers L, Joedicke JJ, Carmody AB, Messer RJ, Kassiotis G, Dudley JP, Dittmer U, Hasenkrug KJ. IL-2-independent and TNF-α-dependent expansion of Vβ5+ natural regulatory T cells during retrovirus infection. THE JOURNAL OF IMMUNOLOGY 2013; 190:5485-95. [PMID: 23645880 DOI: 10.4049/jimmunol.1202951] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Friend virus infection of mice induces the expansion and activation of regulatory T cells (Tregs) that dampen acute immune responses and promote the establishment and maintenance of chronic infection. Adoptive transfer experiments and the expression of neuropilin-1 indicate that these cells are predominantly natural Tregs rather than virus-specific conventional CD4(+) T cells that converted into induced Tregs. Analysis of Treg TCR Vβ chain usage revealed a broadly distributed polyclonal response with a high proportionate expansion of the Vβ5(+) Treg subset, which is known to be responsive to endogenous retrovirus-encoded superantigens. In contrast to the major population of Tregs, the Vβ5(+) subset expressed markers of terminally differentiated effector cells, and their expansion was associated with the level of the antiviral CD8(+) T cell response rather than the level of Friend virus infection. Surprisingly, the expansion and accumulation of the Vβ5(+) Tregs was IL-2 independent but dependent on TNF-α. These experiments reveal a subset-specific Treg induction by a new pathway.
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Affiliation(s)
- Lara Myers
- Laboratory of Persistent Viral Diseases, Rocky Mountain Laboratories, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Hamilton, MT 59840, USA
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46
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Thymus-derived regulatory T cells contribute to tolerance to commensal microbiota. Nature 2013; 497:258-62. [PMID: 23624374 PMCID: PMC3711137 DOI: 10.1038/nature12079] [Citation(s) in RCA: 290] [Impact Index Per Article: 26.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2012] [Accepted: 03/15/2013] [Indexed: 02/06/2023]
Abstract
Peripheral mechanisms preventing autoimmunity and maintaining tolerance to commensal microbiota involve CD4(+) Foxp3(+) regulatory T (Treg) cells generated in the thymus or extrathymically by induction of naive CD4(+) Foxp3(-) T cells. Previous studies suggested that the T-cell receptor repertoires of thymic Treg cells and induced Treg cells are biased towards self and non-self antigens, respectively, but their relative contribution in controlling immunopathology, such as colitis and other untoward inflammatory responses triggered by different types of antigens, remains unresolved. The intestine, and especially the colon, is a particularly suitable organ to study this question, given the variety of self-, microbiota- and food-derived antigens to which Treg cells and other T-cell populations are exposed. Intestinal environments can enhance conversion to a regulatory lineage and favour tolerogenic presentation of antigens to naive CD4(+) T cells, suggesting that intestinal homeostasis depends on microbiota-specific induced Treg cells. Here, to identify the origin and antigen-specificity of intestinal Treg cells, we performed single-cell and high-throughput sequencing of the T-cell receptor repertoires of CD4(+) Foxp3(+) and CD4(+) Foxp3(-) T cells, and analysed their reactivity against specific commensal species. We show that thymus-derived Treg cells constitute most Treg cells in all lymphoid and intestinal organs, including the colon, where their repertoire is heavily influenced by the composition of the microbiota. Our results suggest that thymic Treg cells, and not induced Treg cells, dominantly mediate tolerance to antigens produced by intestinal commensals.
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47
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Abstract
Organs such as the liver, uterus and lung possess hallmark immunotolerant features, making these organs important for sustaining self-homeostasis. These organs contain a relatively large amount of negative regulatory immune cells, which are believed to take part in the regulation of immune responses. Because natural killer cells constitute a large proportion of all lymphocytes in these organs, increasing attention has been given to the roles that these cells play in maintaining immunotolerance. Here, we review the distribution, differentiation, phenotypic features and functional features of natural killer cells in these immunotolerant organs, in addition to the influence of local microenvironments on these cells and how these factors contribute to organ-specific diseases.
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48
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Souroujon MC, Aricha R, Feferman T, Mizrachi K, Reuveni D, Fuchs S. Regulatory T cell-based immunotherapies in experimental autoimmune myasthenia gravis. Ann N Y Acad Sci 2013; 1274:120-6. [PMID: 23252906 DOI: 10.1111/j.1749-6632.2012.06844.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Establishment of tolerance in myasthenia gravis (MG) involves regulatory T (T(reg)) cells. Experimental autoimmune MG (EAMG) in rats is a suitable model for assessing the contribution of T(reg) cells to the immunopathology of the disease and for testing novel T(reg) cell-based treatment modalities. We have studied two immunotherapeutic approaches for targeting of T(reg) cells in myasthenia. By one approach we demonstrated that treatment of sick rats by ex vivo-generated exogenous T(reg) cells derived from healthy donors suppressed EAMG. By a different approach, we aimed at affecting the endogenous T(reg)/Th17 cell balance by targeting IL-6, which has a key role in controlling the equilibrium between pathogenic Th17 and suppressive T(reg) cells. We found that treatment of myasthenic rats by neutralizing anti-IL-6 antibodies shifted this equilibrium in favor of T(reg) cells and led to suppression of EAMG. Our results show that T(reg) cells could serve as potential targets in treating MG patients.
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Affiliation(s)
- Miriam C Souroujon
- Department of Immunology, The Weizmann Institute of Science, Rehovot, Israel.
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49
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Quintana FJ. The aryl hydrocarbon receptor: a molecular pathway for the environmental control of the immune response. Immunology 2013. [PMID: 23190340 DOI: 10.1111/imm.12046] [Citation(s) in RCA: 81] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Environmental factors have significant effects on the development of autoimmune diseases. The ligand-activated transcription factor aryl hydrocarbon receptor (AHR) is controlled by endogenous and environmental small molecules. Hence, AHR provides a molecular pathway by which endogenous and environmental signals can influence the immune response and the development of autoimmune diseases. AHR also provides a target for therapeutic intervention in immune-mediated disorders. In this review, we discuss the role of AHR in the regulation of T-cell differentiation and autoimmunity.
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Affiliation(s)
- Francisco J Quintana
- Center for Neurologic Diseases, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA.
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50
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Impairment of regulatory T cells in myasthenia gravis: studies in an experimental model. Autoimmun Rev 2013; 12:894-903. [PMID: 23535156 DOI: 10.1016/j.autrev.2013.03.009] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/12/2013] [Indexed: 12/27/2022]
Abstract
Myasthenia gravis (MG) is an antibody mediated, T cell dependent autoimmune disease characterized by muscle fatigability in which autoantibodies directed to the acetylcholine receptor (AChR) impair neuromuscular transmission. The identification of CD4⁺CD25⁺Foxp3⁺Treg cells as important regulators of tolerance opened a major area of investigation raising the possibility that a dysfunction in the Treg compartment is involved in the etiology and pathogenesis of autoimmune diseases, including MG. In this paper we summarize shortly Treg abnormalities that were reported in MG patients and report on our studies of Treg in experimental autoimmune MG (EAMG). Hopefully these studies would pave the way towards the development of novel Treg-based treatment modalities that will restore self-tolerance in MG and other autoimmune diseases. In our previous studies in EAMG we have shown that Treg cells transferred from healthy rat donors to myasthenic rats suppress EAMG. However, Treg cells from sick animals do not have the same in vivo suppressive activity as those from healthy donors. The objective of the present study was to further characterize quantitative and qualitative alterations in Treg cells of rats with EAMG. We found that the frequency of CD4⁺CD25⁺Foxp3⁺Treg cells within the spleen and PBL was decreased in EAMG rats as compared to naïve and CFA-immunized healthy controls. Treg cells from myasthenic rats were less effective than Treg cells from controls in suppressing the proliferation of CD4⁺T effector cells in response to ConA and of B cells in response to LPS. Moreover, CD4⁺CD25⁺ cells from EAMG rats exhibited an elevated extent of apoptosis and expressed upregulated levels of FAS and of Th17-associated cytokines. Since EAMG is an induced disease, these quantitative and qualitative alterations in Treg cells do not reflect predisposing impairments and seem to be associated with the specific autoimmune response resulting from AChR immunization.
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