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Abstract
Mucosal surfaces are distinctive sites exposed to environmental, dietary, and microbial antigens. Particularly in the gut, the host continuously actively adapts via complex interactions between the microbiota and dietary compounds and immune and other tissue cells. Regulatory T cells (Tregs) are critical for tuning the intestinal immune response to self- and non-self-antigens in the intestine. Its importance in intestinal homeostasis is illustrated by the onset of overt inflammation caused by deficiency in Treg generation, function, or stability in the gut. A substantial imbalance in Tregs has been observed in intestinal tissue during pathogenic conditions, when a tightly regulated and equilibrated system becomes dysregulated and leads to unimpeded and chronic immune responses. In this chapter, we compile and critically discuss the current knowledge on the key factors that promote Treg-mediated tolerance in the gut, such as those involved in intestinal Treg differentiation, specificity and suppressive function, and their immunophenotype during health and disease. We also discuss the current state of knowledge on Treg dysregulation in human intestine during pathological states such as inflammatory bowel disease (IBD), necrotizing enterocolitis (NEC), graft-versus-host disease (GVHD), and colorectal cancer (CRC), and how that knowledge is guiding development of Treg-targeted therapies to treat or prevent intestinal disorders.
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52
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Hosseini A, Babaloo Z, Gharibi T, Shomali N, Marofi F, Hashemi V, Ayromlou H, Asadi M, Rahmani S, Noorolyai S, Shanehbandi D, Baradaran B. Epigenetic mechanisms shape the underlining expression regulatory mechanisms of the STAT3 in multiple sclerosis disease. BMC Res Notes 2020; 13:568. [PMID: 33375941 PMCID: PMC7771087 DOI: 10.1186/s13104-020-05427-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Accepted: 12/19/2020] [Indexed: 02/06/2023] Open
Abstract
Objectives Immunological tolerance is mediated by CD4+CD25+ regulatory T (Treg) cells. Studies have shown that thymic and peripheral generations of Treg cells depend on the CD28 signaling pathway. T helper 17 (Th17) cells are involved in the pathophysiology of various inflammatory diseases. Cytokines, such as interleukin (IL)-6 and TGF-β, regulate the reciprocal development of Th17 and Treg cells. In CD4+ T cells, signal transducer and activator of transcription 3 (STAT3) play a critical role in the induction of Th17 cell differentiation and inhibition of Treg cell development. Results In this study, we investigated the STAT3 methylation and gene expression status in patients with MS. Our study demonstrated that the level of STAT3 methylation decreased in relapsing–remitting MS patient compared to control groups, which the decreases were statistically significant. STAT3 gene expression increased in patient group relative to healthy one, and the increases were found to be statistically significant. According to our findings, it can be suggested that DNA hypermethylation of STAT3 affects the gene expression. In addition, there is a strong and significant negative correlation between the methylation status and mRNA level of STAT3.
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Affiliation(s)
- Arezoo Hosseini
- Student Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran.,Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.,Department of Immunology, School of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran.,Aging Research Institute, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Zohreh Babaloo
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.,Department of Immunology, School of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Tohid Gharibi
- Student Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran.,Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.,Department of Immunology, School of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran.,Aging Research Institute, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Navid Shomali
- Student Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran.,Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.,Department of Immunology, School of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran.,Aging Research Institute, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Faroogh Marofi
- Department of Immunology, School of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Vida Hashemi
- Department of Basic Science, Faculty of Medicine, Maragheh University of Medical Sciences, Maragheh, Iran
| | - Hormoz Ayromlou
- Department of Neurology, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Milad Asadi
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Shima Rahmani
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Saeed Noorolyai
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Dariush Shanehbandi
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Behzad Baradaran
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran. .,Department of Immunology, School of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran.
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53
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Halliday N, Williams C, Kennedy A, Waters E, Pesenacker AM, Soskic B, Hinze C, Hou TZ, Rowshanravan B, Janman D, Walker LSK, Sansom DM. CD86 Is a Selective CD28 Ligand Supporting FoxP3+ Regulatory T Cell Homeostasis in the Presence of High Levels of CTLA-4. Front Immunol 2020; 11:600000. [PMID: 33363541 PMCID: PMC7753196 DOI: 10.3389/fimmu.2020.600000] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2020] [Accepted: 11/04/2020] [Indexed: 12/20/2022] Open
Abstract
CD80 and CD86 are expressed on antigen presenting cells and are required to engage their shared receptor, CD28, for the costimulation of CD4 T cells. It is unclear why two stimulatory ligands with overlapping roles have evolved. CD80 and CD86 also bind the regulatory molecule CTLA-4. We explored the role of CD80 and CD86 in the homeostasis and proliferation of CD4+FoxP3+ regulatory T cells (Treg), which constitutively express high levels of CTLA-4 yet are critically dependent upon CD28 signals. We observed that CD86 was the dominant ligand for Treg proliferation, survival, and maintenance of a regulatory phenotype, with higher expression of CTLA-4, ICOS, and OX40. We also explored whether CD80-CD28 interactions were specifically compromised by CTLA-4 and found that antibody blockade, clinical deficiency of CTLA-4 and CRISPR-Cas9 deletion of CTLA-4 all improved Treg survival following CD80 stimulation. Taken together, our data suggest that CD86 is the dominant costimulatory ligand for Treg homeostasis, despite its lower affinity for CD28, because CD80-CD28 interactions are selectively impaired by the high levels of CTLA-4. These data suggest a cell intrinsic role for CTLA-4 in regulating CD28 costimulation by direct competition for CD80, and indicate that that CD80 and CD86 have discrete roles in CD28 costimulation of CD4 T cells in the presence of high levels of CTLA-4.
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Affiliation(s)
- Neil Halliday
- Institute of Immunity and Transplantation, University College London, London, United Kingdom.,Institute of Liver and Digestive Health, University College London, London, United Kingdom
| | - Cayman Williams
- Institute of Immunity and Transplantation, University College London, London, United Kingdom
| | - Alan Kennedy
- Institute of Immunity and Transplantation, University College London, London, United Kingdom
| | - Erin Waters
- Institute of Immunity and Transplantation, University College London, London, United Kingdom
| | - Anne M Pesenacker
- Institute of Immunity and Transplantation, University College London, London, United Kingdom
| | - Blagoje Soskic
- Institute of Immunity and Transplantation, University College London, London, United Kingdom
| | - Claudia Hinze
- Institute of Immunity and Transplantation, University College London, London, United Kingdom
| | - Tie Zheng Hou
- Institute of Immunity and Transplantation, University College London, London, United Kingdom
| | - Behzad Rowshanravan
- Institute of Immunity and Transplantation, University College London, London, United Kingdom
| | - Daniel Janman
- Institute of Immunity and Transplantation, University College London, London, United Kingdom
| | - Lucy S K Walker
- Institute of Immunity and Transplantation, University College London, London, United Kingdom
| | - David M Sansom
- Institute of Immunity and Transplantation, University College London, London, United Kingdom
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54
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Watanabe M, Lu Y, Breen M, Hodes RJ. B7-CD28 co-stimulation modulates central tolerance via thymic clonal deletion and Treg generation through distinct mechanisms. Nat Commun 2020; 11:6264. [PMID: 33293517 PMCID: PMC7722925 DOI: 10.1038/s41467-020-20070-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2020] [Accepted: 11/09/2020] [Indexed: 12/22/2022] Open
Abstract
The molecular and cellular mechanisms mediating thymic central tolerance and prevention of autoimmunity are not fully understood. Here we show that B7-CD28 co-stimulation and B7 expression by specific antigen-presenting cell (APC) types are required for clonal deletion and for regulatory T (Treg) cell generation from endogenous tissue-restricted antigen (TRA)-specific thymocytes. While B7-CD28 interaction is required for both clonal deletion and Treg induction, these two processes differ in their CD28 signaling requirements and in their dependence on B7-expressing dendritic cells, B cells, and thymic epithelial cells. Meanwhile, defective thymic clonal deletion due to altered B7-CD28 signaling results in the accumulation of mature, peripheral TRA-specific T cells capable of mediating destructive autoimmunity. Our findings thus reveal a function of B7-CD28 co-stimulation in shaping the T cell repertoire and limiting autoimmunity through both thymic clonal deletion and Treg cell generation.
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MESH Headings
- Animals
- Antigen-Presenting Cells/metabolism
- Autoimmunity/physiology
- B7-1 Antigen/metabolism
- CD28 Antigens/genetics
- CD28 Antigens/metabolism
- Cell Differentiation/immunology
- Central Tolerance
- Clonal Deletion
- Encephalomyelitis, Autoimmune, Experimental/immunology
- Flow Cytometry
- Gene Knock-In Techniques
- Mice
- Mice, Knockout
- Receptors, Antigen, T-Cell, alpha-beta/genetics
- Receptors, Antigen, T-Cell, alpha-beta/metabolism
- Signal Transduction/immunology
- T-Lymphocytes, Regulatory/immunology
- T-Lymphocytes, Regulatory/metabolism
- Thymocytes/physiology
- Thymus Gland/cytology
- Thymus Gland/immunology
- Thymus Gland/metabolism
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Affiliation(s)
- Masashi Watanabe
- Experimental Immunology Branch, National Cancer Institute, Bethesda, MD, 20892, USA
| | - Ying Lu
- Experimental Immunology Branch, National Cancer Institute, Bethesda, MD, 20892, USA
| | - Michael Breen
- Experimental Immunology Branch, National Cancer Institute, Bethesda, MD, 20892, USA
| | - Richard J Hodes
- Experimental Immunology Branch, National Cancer Institute, Bethesda, MD, 20892, USA.
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55
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Drescher HK, Bartsch LM, Weiskirchen S, Weiskirchen R. Intrahepatic T H17/T Reg Cells in Homeostasis and Disease-It's All About the Balance. Front Pharmacol 2020; 11:588436. [PMID: 33123017 PMCID: PMC7566778 DOI: 10.3389/fphar.2020.588436] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Accepted: 09/15/2020] [Indexed: 12/14/2022] Open
Abstract
Both acute and chronic hepatic inflammation likely result from an imbalance in the TH1/TH2 cell response and can lead to liver fibrosis and end-stage liver disease. More recently, a novel CD4+ T helper cell subset was described, characterized by the production of IL-17 and IL-22. These TH17 cells 50were predominantly implicated in host defense against infections and in autoimmune diseases. Interestingly, studies over the last 10 years revealed that the development of TH17 cells favors pro-inflammatory responses in almost all tissues and there is a reciprocal relationship between TH17 and TReg cells. The balance between TH17and TReg cells is critical for immune reactions, especially in injured liver tissue and the return to immune homeostasis. The pathogenic contribution of TH17 and TReg cells in autoimmunity, acute infection, and chronic liver injury is diverse and varies among disease etiologies. Understanding the mechanisms underlying TH17 cell development, recruitment, and maintenance, along with the suppression of TReg cells, will inform the development of new therapeutic strategies in liver diseases. Active manipulation of the balance between pathogenic and regulatory processes in the liver may assist in the restoration of homeostasis, especially in hepatic inflammation.
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Affiliation(s)
- Hannah K Drescher
- Division of Gastroenterology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States
| | - Lea M Bartsch
- Division of Gastroenterology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States
| | - Sabine Weiskirchen
- Institute of Molecular Pathobiochemistry, Experimental Gene Therapy and Clinical Chemistry (IFMPEGKC), University Hospital, RWTH Aachen, Aachen, Germany
| | - Ralf Weiskirchen
- Institute of Molecular Pathobiochemistry, Experimental Gene Therapy and Clinical Chemistry (IFMPEGKC), University Hospital, RWTH Aachen, Aachen, Germany
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56
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Zhu L, Hua F, Ding W, Ding K, Zhang Y, Xu C. The correlation between the Th17/Treg cell balance and bone health. IMMUNITY & AGEING 2020; 17:30. [PMID: 33072163 PMCID: PMC7557094 DOI: 10.1186/s12979-020-00202-z] [Citation(s) in RCA: 54] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Accepted: 10/06/2020] [Indexed: 02/08/2023]
Abstract
With the ageing of the world population, osteoporosis has become a problem affecting quality of life. According to the traditional view, the causes of osteoporosis mainly include endocrine disorders, metabolic disorders and mechanical factors. However, in recent years, the immune system and immune factors have been shown to play important roles in the occurrence and development of osteoporosis. Among these components, regulatory T (Treg) cells and T helper 17 (Th17) cells are crucial for maintaining bone homeostasis, especially osteoclast differentiation. Treg cells and Th17 cells originate from the same precursor cells, and their differentiation requires involvement of the TGF-β regulated signalling pathway. Treg cells and Th17 cells have opposite functions. Treg cells inhibit the differentiation of osteoclasts in vivo and in vitro, while Th17 cells promote the differentiation of osteoclasts. Therefore, understanding the balance between Treg cells and Th17 cells is anticipated to provide a new idea for the development of novel treatments for osteoporosis.
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Affiliation(s)
- Lei Zhu
- The Third Affiliated Hospital of Soochow University, The First People's Hospital of Changzhou, Jiangsu, 213003 China
| | - Fei Hua
- The Third Affiliated Hospital of Soochow University, The First People's Hospital of Changzhou, Jiangsu, 213003 China
| | - Wenge Ding
- The Third Affiliated Hospital of Soochow University, The First People's Hospital of Changzhou, Jiangsu, 213003 China
| | - Kai Ding
- The Third Affiliated Hospital of Soochow University, The First People's Hospital of Changzhou, Jiangsu, 213003 China
| | - Yige Zhang
- The Third Affiliated Hospital of Soochow University, The First People's Hospital of Changzhou, Jiangsu, 213003 China
| | - Chenyang Xu
- The Third Affiliated Hospital of Soochow University, The First People's Hospital of Changzhou, Jiangsu, 213003 China
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57
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Janssens I, Cools N. Regulating the regulators: Is introduction of an antigen-specific approach in regulatory T cells the next step to treat autoimmunity? Cell Immunol 2020; 358:104236. [PMID: 33137651 DOI: 10.1016/j.cellimm.2020.104236] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Revised: 09/28/2020] [Accepted: 10/04/2020] [Indexed: 12/22/2022]
Abstract
In autoimmunity, the important and fragile balance between immunity and tolerance is disturbed, resulting in abnormal immune responses to the body's own tissues and cells. CD4+CD25hiFoxP3+ regulatory T cells (Tregs) induce peripheral tolerance in vivo by means of direct cell-cell contact and release of soluble factors, or indirectly through antigen-presenting cells (APC), thereby controlling auto-reactive effector T cells. Based on these unique capacities of Tregs, preclinical studies delivered proof-of-principle for the clinical use of Tregs for the treatment of autoimmune diseases. To date, the first clinical trials using ex vivo expanded polyclonal Tregs have been completed. These pioneering studies demonstrate the feasibility of generating large numbers of polyclonal Tregs in a good manufacturing practices (GMP)-compliant manner, and that infusion of Tregs is well tolerated by patients with no evidence of general immunosuppression. Nonetheless, only modest clinical results were observed, arguing that a more antigen-specific approach might be needed to foster a durable patient-specific clinical cell therapy without the risk for general immunosuppression. In this review, we discuss current knowledge, applications and future goals of adoptive immune-modulatory Treg therapy for the treatment of autoimmune disease and transplant rejection. We describe the key advances and prospects of the potential use of T cell receptor (TCR)- and chimeric antigen receptor (CAR)-engineered Tregs in future clinical applications. These approaches could deliver the long-awaited breakthrough in stopping undesired autoimmune responses and transplant rejections.
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Affiliation(s)
- Ibo Janssens
- Laboratory of Experimental Hematology, Vaccine and Infectious Disease Institute (VAXINFECTIO), Faculty of Medicine and Health Sciences, University of Antwerp, 2610 Antwerp, Belgium.
| | - Nathalie Cools
- Laboratory of Experimental Hematology, Vaccine and Infectious Disease Institute (VAXINFECTIO), Faculty of Medicine and Health Sciences, University of Antwerp, 2610 Antwerp, Belgium
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58
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Ahmed A, Vyakarnam A. Emerging patterns of regulatory T cell function in tuberculosis. Clin Exp Immunol 2020; 202:273-287. [PMID: 32639588 PMCID: PMC7670141 DOI: 10.1111/cei.13488] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Revised: 06/12/2020] [Accepted: 06/22/2020] [Indexed: 12/22/2022] Open
Abstract
Tuberculosis (TB) is one of the top 10 causes of mortality worldwide from a single infectious agent and has significant implications for global health. A major hurdle in the development of effective TB vaccines and therapies is the absence of defined immune‐correlates of protection. In this context, the role of regulatory T cells (Treg), which are essential for maintaining immune homeostasis, is even less understood. This review aims to address this knowledge gap by providing an overview of the emerging patterns of Treg function in TB. Increasing evidence from studies, both in animal models of infection and TB patients, points to the fact the role of Tregs in TB is dependent on disease stage. While Tregs might expand and delay the appearance of protective responses in the early stages of infection, their role in the chronic phase perhaps is to counter‐regulate excessive inflammation. New data highlight that this important homeostatic role of Tregs in the chronic phase of TB may be compromised by the expansion of activated human leucocyte antigen D‐related (HLA‐DR)+CD4+ suppression‐resistant effector T cells. This review provides a comprehensive and critical analysis of the key features of Treg cells in TB; highlights the importance of a balanced immune response as being important in TB and discusses the importance of probing not just Treg frequency but also qualitative aspects of Treg function as part of a comprehensive search for novel TB treatments.
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Affiliation(s)
- A Ahmed
- Laboratory of Immunology of HIV-TB Co-infection, Center for Infectious Disease Research (CIDR), Indian Institute of Science (IISc), Bangalore, India
| | - A Vyakarnam
- Laboratory of Immunology of HIV-TB Co-infection, Center for Infectious Disease Research (CIDR), Indian Institute of Science (IISc), Bangalore, India.,Peter Gorer Department of Immunobiology, School of Immunology and Microbial Sciences, Faculty of Life Sciences and Medicine, Guy's Hospital, King's College London (KCL), London, UK
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59
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Darrigues J, Santamaria JC, Galindo-Albarrán A, Robey EA, Joffre OP, van Meerwijk JPM, Romagnoli P. Robust intrathymic development of regulatory T cells in young NOD mice is rapidly restrained by recirculating cells. Eur J Immunol 2020; 51:580-593. [PMID: 32730634 DOI: 10.1002/eji.202048743] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2020] [Revised: 07/03/2020] [Accepted: 07/28/2020] [Indexed: 12/11/2022]
Abstract
Regulatory T lymphocytes (Treg) play a vital role in the protection of the organism against autoimmune pathology. It is therefore paradoxical that comparatively large numbers of Treg were found in the thymus of type I diabetes-prone NOD mice. The Treg population in the thymus is composed of newly developing cells and cells that had recirculated from the periphery back to the thymus. We here demonstrate that exceptionally large numbers of Treg develop in the thymus of young, but not adult, NOD mice. Once emigrated from the thymus, an unusually large proportion of these Treg is activated in the periphery, which causes a particularly abundant accumulation of recirculating Treg in the thymus. These cells then rapidly inhibit de novo development of Treg. The proportions of developing Treg thus reach levels similar to or lower than those found in most other, type 1 diabetes-resistant, inbred mouse strains. Thus, in adult NOD mice the particularly large Treg-niche is actually composed of mostly recirculating cells and only few newly developing Treg.
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Affiliation(s)
- Julie Darrigues
- Centre de Physiopathologie Toulouse Purpan (CPTP), Inserm U1043, CNRS UMR 5282, Université de Toulouse III (UPS), Toulouse, France
| | - Jeremy C Santamaria
- Centre de Physiopathologie Toulouse Purpan (CPTP), Inserm U1043, CNRS UMR 5282, Université de Toulouse III (UPS), Toulouse, France
| | - Ariel Galindo-Albarrán
- Centre de Physiopathologie Toulouse Purpan (CPTP), Inserm U1043, CNRS UMR 5282, Université de Toulouse III (UPS), Toulouse, France.,Station d'Ecologie Théorique et Expérimentale, CNRS, Moulis, France, Université Paul Sabatier, Moulis, France
| | - Ellen A Robey
- Division of Immunology and Pathogenesis, Department of Molecular and Cell Biology, University of California, Berkeley, CA
| | - Olivier P Joffre
- Centre de Physiopathologie Toulouse Purpan (CPTP), Inserm U1043, CNRS UMR 5282, Université de Toulouse III (UPS), Toulouse, France
| | - Joost P M van Meerwijk
- Centre de Physiopathologie Toulouse Purpan (CPTP), Inserm U1043, CNRS UMR 5282, Université de Toulouse III (UPS), Toulouse, France
| | - Paola Romagnoli
- Centre de Physiopathologie Toulouse Purpan (CPTP), Inserm U1043, CNRS UMR 5282, Université de Toulouse III (UPS), Toulouse, France
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60
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Waickman AT, Keller HR, Kim TH, Luckey MA, Tai X, Hong C, Molina-París C, Walsh STR, Park JH. The Cytokine Receptor IL-7Rα Impairs IL-2 Receptor Signaling and Constrains the In Vitro Differentiation of Foxp3 + Treg Cells. iScience 2020; 23:101421. [PMID: 32791329 PMCID: PMC7424196 DOI: 10.1016/j.isci.2020.101421] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Revised: 06/16/2020] [Accepted: 07/24/2020] [Indexed: 01/09/2023] Open
Abstract
IL-7 receptor signaling is essential for the generation and maintenance of conventional T cells. Immunosuppressive Foxp3+ Treg cells, however, express uniquely low amounts of the IL-7-proprietary IL-7Rα so that they are impaired in IL-7 signaling. Because Treg cells depend on IL-2, the loss of IL-7Rα has been considered irrelevant for Treg cells. In contrast, here, we report that IL-7Rα downregulation is necessary to maximize IL-2R signaling. Although IL-7Rα overexpression promoted IL-7 signaling, unexpectedly, IL-2 signaling was suppressed in the same cells. Mechanistically, we found that γc, which is a receptor subunit shared by IL-7R and IL-2R, directly binds and pre-associates with IL-7Rα, thus limiting its availability for IL-2R binding. Consequently, overexpression of signaling-deficient, tailless IL-7Rα proteins inhibited IL-2R signaling, demonstrating that IL-7Rα sequesters γc and suppresses IL-2R signaling by extracellular interactions. Collectively, these results reveal a previously unappreciated regulatory mechanism of IL-2 receptor signaling that is governed by IL-7Rα abundance.
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Affiliation(s)
- Adam T Waickman
- Experimental Immunology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, NIH, Bethesda, MD 20892, USA
| | - Hilary R Keller
- Experimental Immunology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, NIH, Bethesda, MD 20892, USA; Department of Surgery, Guthrie Robert Packer Hospital, Sayre, PA, USA
| | - Tae-Hyoun Kim
- Experimental Immunology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, NIH, Bethesda, MD 20892, USA
| | - Megan A Luckey
- Experimental Immunology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, NIH, Bethesda, MD 20892, USA
| | - Xuguang Tai
- Experimental Immunology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, NIH, Bethesda, MD 20892, USA
| | - Changwan Hong
- Department of Anatomy, Pusan National University School of Medicine, Yangsan 50612, South Korea
| | - Carmen Molina-París
- Department of Applied Mathematics, School of Mathematics, University of Leeds, Leeds, UK
| | - Scott T R Walsh
- Chemical Biology Laboratory, Center for Cancer Research, National Cancer Institute, NIH, Frederick, MD 21702, USA
| | - Jung-Hyun Park
- Experimental Immunology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, NIH, Bethesda, MD 20892, USA.
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61
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Lebel MÈ, Coutelier M, Galipeau M, Kleinman CL, Moon JJ, Melichar HJ. Differential expression of tissue-restricted antigens among mTEC is associated with distinct autoreactive T cell fates. Nat Commun 2020; 11:3734. [PMID: 32709894 PMCID: PMC7381629 DOI: 10.1038/s41467-020-17544-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2019] [Accepted: 07/07/2020] [Indexed: 12/12/2022] Open
Abstract
Medullary thymic epithelial cells (mTEC) contribute to the development of T cell tolerance by expressing and presenting tissue-restricted antigens (TRA), so that developing T cells can assess the self-reactivity of their antigen receptors prior to leaving the thymus. mTEC are a heterogeneous population of cells that differentially express TRA. Whether mTEC subsets induce distinct autoreactive T cell fates remains unclear. Here, we establish bacterial artificial chromosome (BAC)-transgenic mouse lines with biased mTEClo or mTEChi expression of model antigens. The transgenic lines support negative selection of antigen-specific thymocytes depending on antigen dose. However, model antigen expression predominantly by mTEClo supports TCRαβ+ CD8αα intraepithelial lymphocyte development; meanwhile, mTEChi-restricted expression preferentially induces Treg differentiation of antigen-specific cells in these models to impact control of infectious agents and tumor growth. In summary, our data suggest that mTEC subsets may have a function in directing distinct mechanisms of T cell tolerance.
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Affiliation(s)
- Marie-Ève Lebel
- Maisonneuve-Rosemont Hospital Research Center, 5415 Boulevard de l'Assomption, Montreal, QC, H1T 2M4, Canada
- Département de microbiologie, infectiologie et immunologie, Université de Montréal, C.P. 6128, succ. Centre-ville, Montreal, QC, H3C 3J7, Canada
| | - Marie Coutelier
- The Lady Davis Institute for Medical Research, Jewish General Hospital, 3999 Côte Ste-Catherine Road Room E-542, Montreal, QC, H3T 1E2, Canada
- Department of Human Genetics, McGill University, Rm W-315, Strathcona Anatomy & Dentistry Building 3640 rue University, Montreal, QC, H3A 0C7, Canada
| | - Maria Galipeau
- Maisonneuve-Rosemont Hospital Research Center, 5415 Boulevard de l'Assomption, Montreal, QC, H1T 2M4, Canada
| | - Claudia L Kleinman
- The Lady Davis Institute for Medical Research, Jewish General Hospital, 3999 Côte Ste-Catherine Road Room E-542, Montreal, QC, H3T 1E2, Canada
- Department of Human Genetics, McGill University, Rm W-315, Strathcona Anatomy & Dentistry Building 3640 rue University, Montreal, QC, H3A 0C7, Canada
| | - James J Moon
- Center for Immunology and Inflammatory Diseases and Division of Pulmonary and Critical Care Medicine, Massachusetts General Hospital and Harvard Medical School, 149 13th Street, Charlestown, MA, 02129, USA
| | - Heather J Melichar
- Maisonneuve-Rosemont Hospital Research Center, 5415 Boulevard de l'Assomption, Montreal, QC, H1T 2M4, Canada.
- Département de médecine, Université de Montréal, C.P. 6128, succ. Centre-ville, Montreal, QC, H3C 3J7, Canada.
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62
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Hill GR, Koyama M. Cytokines and costimulation in acute graft-versus-host disease. Blood 2020; 136:418-428. [PMID: 32526028 PMCID: PMC7378458 DOI: 10.1182/blood.2019000952] [Citation(s) in RCA: 59] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2019] [Accepted: 01/18/2020] [Indexed: 12/11/2022] Open
Abstract
Allogeneic hematopoietic stem cell transplantation (alloSCT) is an important curative therapy for high-risk hematological malignancies, but the development of severe and/or steroid-refractory acute graft-versus-host disease (aGVHD) remains a significant limitation to optimal outcomes. New approaches to prevent and treat aGVHD remain an unmet need that can be best addressed by understanding the complex disease pathophysiology. It is now clear that chemoradiotherapy used prior to alloSCT induces the release of endogenous alarmins (eg, HMGB-1, ATP, IL-1α, IL-33) from recipient tissue. Exogenous pathogen-derived molecules (eg, lipopolysaccharide, nucleic acids) also translocate from the gastrointestinal tract lumen. Together, these danger signals activate antigen-presenting cells (APCs) to efficiently present alloantigen to donor T cells while releasing cytokines (eg, interleukin-12 [IL-12], IL-23, IL-6, IL-27, IL-10, transforming growth factor-β) that expand and differentiate both pathogenic and regulatory donor T cells. Concurrent costimulatory signals at the APC-T-cell interface (eg, CD80/CD86-CD28, CD40-CD40L, OX40L-OX40, CD155/CD112-DNAM-1) and subsequent coinhibitory signals (eg, CD80/CD86-CTLA4, PDL1/2-PD1, CD155/CD112-TIGIT) are critical to the acquisition of effector T-cell function and ensuing secretion of pathogenic cytokines (eg, IL-17, interferon-γ, tissue necrosis factor, granulocyte-macrophage colony-stimulating factor) and cytolytic degranulation pathway effectors (eg, perforin/granzyme). This review focuses on the combination of cytokine and costimulatory networks at the T-cell surface that culminates in effector function and subsequent aGVHD in target tissue. Together, these pathways now represent robust and clinically tractable targets for preventing the initiation of deleterious immunity after alloSCT.
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Affiliation(s)
- Geoffrey R Hill
- Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, WA; and
- Division of Medical Oncology, Department of Medicine, University of Washington, Seattle, WA
| | - Motoko Koyama
- Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, WA; and
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63
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Leddon SA, Fettis MM, Abramo K, Kelly R, Oleksyn D, Miller J. The CD28 Transmembrane Domain Contains an Essential Dimerization Motif. Front Immunol 2020; 11:1519. [PMID: 32765524 PMCID: PMC7378745 DOI: 10.3389/fimmu.2020.01519] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Accepted: 06/09/2020] [Indexed: 12/13/2022] Open
Abstract
CD28 plays a critical role in regulating immune responses both by enhancing effector T cell activation and differentiation and controlling the development and function of regulatory T cells. CD28 is expressed at the cell surface as a disulfide linked homodimer that is thought to bind ligand monovalently. How ligand binding triggers CD28 to induce intracellular signaling as well as the proximal signaling pathways that are induced are not well-understood. In addition, recent data suggest inside-out signaling initiated by the T cell antigen receptor can enhance CD28 ligand binding, possibly by inducing a rearrangement of the CD28 dimer interface to allow for bivalent binding. To understand how possible conformational changes during ligand-induced receptor triggering and inside-out signaling are mediated, we examined the CD28 transmembrane domain. We identified an evolutionarily conserved YxxxxT motif that is shared with CTLA-4 and resembles the transmembrane dimerization motif within CD3ζ. We show that the CD28 transmembrane domain can drive protein dimerization in a bacterial expression system at levels equivalent to the well-known glycophorin A transmembrane dimerization motif. In addition, ectopic expression of the CD28 transmembrane domain into monomeric human CD25 can drive dimerization in murine T cells as detected by an increase in FRET by flow cytometry. Mutation of the polar YxxxxT motif to hydrophobic leucine residues (Y145L/T150L) attenuated CD28 transmembrane mediated dimerization in both the bacterial and mammalian assays. Introduction of the Y145L/T150L mutation of the CD28 transmembrane dimerization motif into the endogenous CD28 locus by CRISPR resulted in a dramatic loss in CD28 cell surface expression. These data suggest that under physiological conditions the YxxxxT dimerization motif within the CD28 transmembrane domain plays a critical role in the assembly and/or expression of stable CD28 dimers at the cell surface.
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Affiliation(s)
- Scott A Leddon
- Department of Microbiology and Immunology, David H. Smith Center for Vaccine Biology and Immunology, University of Rochester Medical Center, Rochester, NY, United States
| | - Margaret M Fettis
- Department of Microbiology and Immunology, David H. Smith Center for Vaccine Biology and Immunology, University of Rochester Medical Center, Rochester, NY, United States
| | - Kristin Abramo
- Department of Microbiology and Immunology, David H. Smith Center for Vaccine Biology and Immunology, University of Rochester Medical Center, Rochester, NY, United States
| | - Ryan Kelly
- Department of Microbiology and Immunology, David H. Smith Center for Vaccine Biology and Immunology, University of Rochester Medical Center, Rochester, NY, United States
| | - David Oleksyn
- Department of Microbiology and Immunology, David H. Smith Center for Vaccine Biology and Immunology, University of Rochester Medical Center, Rochester, NY, United States
| | - Jim Miller
- Department of Microbiology and Immunology, David H. Smith Center for Vaccine Biology and Immunology, University of Rochester Medical Center, Rochester, NY, United States
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64
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Amarnath S, Brown ML. Harnessing proteases for T regulatory cell immunotherapy. Eur J Immunol 2020; 50:770-778. [PMID: 32383480 DOI: 10.1002/eji.201948270] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2019] [Revised: 03/08/2020] [Accepted: 05/06/2020] [Indexed: 12/27/2022]
Abstract
The immune system is tightly regulated by a subset of T cells defined as regulatory T cells (Tregs). Tregs maintain immune homeostasis by restraining unwarranted immune cell activation and effector function. Here, we discuss an important but underappreciated role of proteases in controlling Treg function. Proteases regulate a number of vital processes that determine T cell immune responses and some of them such as furin, ADAM (through regulating LAG receptor), MALT, and asparaginyl endopeptidase are implicated in Treg immunobiology. Targeted protease inhibition, using either small molecule inhibitors or gene deficient mice has demonstrated their specificity in modulating Treg function in experimental murine models. These data further highlight the ability of proteases to specifically regulate Tregs but no other T effector lineages. Taken together, it is apparent that incorporating proteases as targets within Treg cell engineering protocols may enable generation of robust Treg cellular therapeutics. These engineered Tregs may possess enhanced regulatory function along with resistance to lineage deviation in inflammatory disease such as colitis and graft versus host disease. Within this review, we summarize research on the role of proteases in regulating Treg function and discuss the translational potential of harnessing Treg function by targeting protease driven regulatory pathways.
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Affiliation(s)
- Shoba Amarnath
- NUTranslational and Clinical Research Institute, Newcastle University, Newcastle Upon Tyne, UK
| | - Marnie L Brown
- NUTranslational and Clinical Research Institute, Newcastle University, Newcastle Upon Tyne, UK
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65
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Epigenetic conversion of conventional T cells into regulatory T cells by CD28 signal deprivation. Proc Natl Acad Sci U S A 2020; 117:12258-12268. [PMID: 32414925 PMCID: PMC7275710 DOI: 10.1073/pnas.1922600117] [Citation(s) in RCA: 56] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Regulatory T cells (Tregs) expressing the Treg-specific transcription factor Foxp3 are indispensable for suppressing hazardous immune responses such as autoimmune disease and allergy. Their stable function requires DNA hypomethylation at specific regions of Treg function-associated genes such as Foxp3. This report shows that, in the course of in vitro Treg generation from conventional T cells by antigenic stimulation in the presence of TGF-β and IL-2, deprivation of CD28 costimulatory signal can induce Treg-specific DNA hypomethylation in developing Tregs. Additional in vitro culture with IL-2 alone further stabilizes their Treg-type hypomethylation status, enabling their in vivo transfer to effectively suppress immune responses. These findings would help in producing functionally stable Tregs from disease-mediating T cells for treatment of various immunological diseases. Foxp3-expressing regulatory T cells (Tregs) can be generated in vitro by antigenic stimulation of conventional T cells (Tconvs) in the presence of TGF-β and IL-2. However, unlike Foxp3+ naturally occurring Tregs, such in vitro induced Tregs (iTregs) are functionally unstable mainly because of incomplete Treg-type epigenetic changes at Treg signature genes such as Foxp3. Here we show that deprivation of CD28 costimulatory signal at an early stage of iTreg generation is able to establish Treg-specific DNA hypomethylation at Treg signature genes. It was achieved, for example, by TCR/TGF-β/IL-2 stimulation of CD28-deficient Tconvs or CD28-intact Tconvs without anti-CD28 agonistic mAb or with CD80/CD86-blocked or -deficient antigen-presenting cells. The signal abrogation could induce Treg-type hypomethylation in memory/effector as well as naive Tconvs, while hindering Tconv differentiation into effector T cells. Among various cytokines and signal activators/inhibitors, TNF-α and PKC agonists inhibited the hypomethylation. Furthermore, CD28 signal deprivation significantly reduced c-Rel expression in iTregs; and the specific genomic perturbation of a NF-κB binding motif at the Foxp3 CNS2 locus enhanced the locus-specific DNA hypomethylation even in CD28 signaling-intact iTregs. In addition, in vitro maintenance of such epigenome-installed iTregs with IL-2 alone, without additional TGF-β or antigenic stimulation, enabled their expansion and stabilization of Treg-specific DNA hypomethylation. These iTregs indeed stably expressed Foxp3 after in vivo transfer and effectively suppressed antigen-specific immune responses. Taken together, inhibition of the CD28-PKC-NF-κB signaling pathway in iTreg generation enables de novo acquisition of Treg-specific DNA hypomethylation at Treg signature genes and abundant production of functionally stable antigen-specific iTregs for therapeutic purposes.
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66
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Hou J, Sun Y. Role of Regulatory T Cells in Disturbed Immune Homeostasis in Patients With Chronic Obstructive Pulmonary Disease. Front Immunol 2020; 11:723. [PMID: 32411140 PMCID: PMC7198877 DOI: 10.3389/fimmu.2020.00723] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Accepted: 03/30/2020] [Indexed: 12/20/2022] Open
Abstract
Chronic obstructive pulmonary disease (COPD) is a complex chronic disease in which T cell-mediated pulmonary inflammation has been shown to play a key role. Accumulating evidence shows that COPD has many of the characteristics of an autoimmune response. An adaptive immune response directed against lung self-antigens, which are released during the initial innate inflammatory response and are triggered by constant exposure to cigarette smoke and epithelial injury, drives the persistent inflammatory response found in smokers. The development and severity of adaptive inflammation depend on the level of tolerance to self-antigens. For these reasons, the effect of regulatory T (Treg) cells on adaptive immunity in COPD patients is of particular interest and could be targeted therapeutically. The disturbance in immune homeostasis caused by changes in the number or function of Treg cells, which is related to cigarette smoke exposure, may be of importance in understanding the development and progression of COPD.
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Affiliation(s)
- Jia Hou
- Department of Respiratory and Critical Care Medicine, General Hospital of Ningxia Medical University, Ningxia, China
| | - Yongchang Sun
- Department of Respiratory and Critical Care Medicine, Peking University Third Hospital, Beijing, China
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67
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Ono M. Control of regulatory T-cell differentiation and function by T-cell receptor signalling and Foxp3 transcription factor complexes. Immunology 2020; 160:24-37. [PMID: 32022254 DOI: 10.1111/imm.13178] [Citation(s) in RCA: 97] [Impact Index Per Article: 24.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2019] [Revised: 12/18/2019] [Accepted: 01/11/2020] [Indexed: 12/11/2022] Open
Abstract
The transcription factor Foxp3 controls the differentiation and function of regulatory T-cells (Treg). Studies in the past decades identified numerous Foxp3-interacting protein partners. However, it is still not clear how Foxp3 produces the Treg-type transcriptomic landscape through cooperating with its partners. Here I show the current understanding of how Foxp3 transcription factor complexes regulate the differentiation, maintenance and functional maturation of Treg. Importantly, T-cell receptor (TCR) signalling plays central roles in Treg differentiation and Foxp3-mediated gene regulation. Differentiating Treg will have recognized their cognate antigens and received TCR signals before initiating Foxp3 transcription, which is triggered by TCR-induced transcription factors including NFAT, AP-1 and NF-κB. Once expressed, Foxp3 seizes TCR signal-induced transcriptional and epigenetic mechanisms through interacting with AML1/Runx1 and NFAT. Thus, Foxp3 modifies gene expression dynamics of TCR-induced genes, which constitute cardinal mechanisms for Treg-mediated immune suppression. Next, I discuss the following key topics, proposing new mechanistic models for Foxp3-mediated gene regulation: (i) how Foxp3 transcription is induced and maintained by the Foxp3-inducing enhanceosome and the Foxp3 autoregulatory transcription factor complex; (ii) molecular mechanisms for effector Treg differentiation (i.e. Treg maturation); (iii) how Foxp3 activates or represses its target genes through recruiting coactivators and corepressors; (iv) the 'decision-making' Foxp3-containing transcription factor complex for Th17 and Treg differentiation; and (v) the roles of post-translational modification in Foxp3 regulation. Thus, this article provides cutting-edge understanding of molecular biology of Foxp3 and Treg, integrating findings by biochemical and genomic studies.
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Affiliation(s)
- Masahiro Ono
- Department of Life Sciences, Imperial College London, London, UK
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68
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Wang H, Lu CH, Ho PC. Metabolic adaptation orchestrates tissue context-dependent behavior in regulatory T cells. Immunol Rev 2020; 295:126-139. [PMID: 32147869 DOI: 10.1111/imr.12844] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2020] [Accepted: 02/19/2020] [Indexed: 02/07/2023]
Abstract
The diverse distribution and functions of regulatory T cells (Tregs) ensure tissue and immune homeostasis; however, it remains unclear which factors can guide distribution, local differentiation, and tissue context-specific behavior in Tregs. Although the emerging concept that Tregs could re-adjust their transcriptome based on their habitations is supported by recent findings, the underlying mechanisms that reprogram transcriptome in Tregs are unknown. In the past decade, metabolic machineries have been revealed as a new regulatory circuit, known as immunometabolic regulation, to orchestrate activation, differentiation, and functions in a variety of immune cells, including Tregs. Given that systemic and local alterations of nutrient availability and metabolite profile associate with perturbation of Treg abundance and functions, it highlights that immunometabolic regulation may be one of the mechanisms that orchestrate tissue context-specific regulation in Tregs. The understanding on how metabolic program instructs Tregs in peripheral tissues not only represents a critical opportunity to delineate a new avenue in Treg biology but also provides a unique window to harness Treg-targeting approaches for treating cancer and autoimmunity with minimizing side effects. This review will highlight the metabolic features on guiding Treg formation and function in a disease-oriented perspective and aim to pave the foundation for future studies.
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Affiliation(s)
- Haiping Wang
- Department of Fundamental Oncology, University of Lausanne, Lausanne, Switzerland.,Ludwig Institute for Cancer Research, University of Lausanne, Epalinges, Switzerland
| | - Chun-Hao Lu
- Department of Fundamental Oncology, University of Lausanne, Lausanne, Switzerland.,Ludwig Institute for Cancer Research, University of Lausanne, Epalinges, Switzerland
| | - Ping-Chih Ho
- Department of Fundamental Oncology, University of Lausanne, Lausanne, Switzerland.,Ludwig Institute for Cancer Research, University of Lausanne, Epalinges, Switzerland
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69
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Baran DA, Rao P, Deo D, Zucker MJ. Differential gene expression in non-adherent heart transplant survivors: Implications for regulatory T-cell expression. Clin Transplant 2020; 34:e13834. [PMID: 32072690 DOI: 10.1111/ctr.13834] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2019] [Revised: 01/27/2020] [Accepted: 02/16/2020] [Indexed: 11/30/2022]
Abstract
Survival despite prolonged non-adherence with immunosuppression is rare but has been reported in kidney, lung, and liver transplantation. Its occurrence in heart transplantation is quite rare. Our study was prompted by an index patient who survived despite prolonged medication non-adherence. Prospective consent and blood collection were conducted for seven additional patients who presented in a similar fashion. The blood of patients who were diagnosed with rejection, stable early post-transplant, and stable more than 5 years post-transplant were all compared with a custom gene array focusing on T-regulatory cell processes. The two genes that were differentially expressed in every comparison were TGF beta and RNASEN with very low expression in the rejector group. The prolonged non-adherent group had the maximum expression for TGF beta but average RNASEN expression as compared to the low expression for rejectors and high for post-5 years patients. The patients presented survived for varying lengths of time without immunosuppression. The gene array analysis showed intriguing differences between these rare patients and important patient cohorts. Further efforts should be directed to finding and studying more patients who survive despite lack of prescribed immunosuppression. The mechanisms underlying this phenomenon may inform future advances in transplant immunosuppression.
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Affiliation(s)
| | - Prakash Rao
- New Jersey Sharing Network, New Providence, NJ, USA
| | - Dayanand Deo
- New Jersey Sharing Network, New Providence, NJ, USA
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70
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Colamatteo A, Carbone F, Bruzzaniti S, Galgani M, Fusco C, Maniscalco GT, Di Rella F, de Candia P, De Rosa V. Molecular Mechanisms Controlling Foxp3 Expression in Health and Autoimmunity: From Epigenetic to Post-translational Regulation. Front Immunol 2020; 10:3136. [PMID: 32117202 PMCID: PMC7008726 DOI: 10.3389/fimmu.2019.03136] [Citation(s) in RCA: 72] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Accepted: 12/23/2019] [Indexed: 12/12/2022] Open
Abstract
The discovery of the transcription factor Forkhead box-p3 (Foxp3) has shed fundamental insights into the understanding of the molecular determinants leading to generation and maintenance of T regulatory (Treg) cells, a cell population with a key immunoregulatory role. Work over the past few years has shown that fine-tuned transcriptional and epigenetic events are required to ensure stable expression of Foxp3 in Treg cells. The equilibrium between phenotypic plasticity and stability of Treg cells is controlled at the molecular level by networks of transcription factors that bind regulatory sequences, such as enhancers and promoters, to regulate Foxp3 expression. Recent reports have suggested that specific modifications of DNA and histones are required for the establishment of the chromatin structure in conventional CD4+ T (Tconv) cells for their future differentiation into the Treg cell lineage. In this review, we discuss the molecular events that control Foxp3 gene expression and address the associated alterations observed in human diseases. Also, we explore how Foxp3 influences the gene expression programs in Treg cells and how unique properties of Treg cell subsets are defined by other transcription factors.
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Affiliation(s)
- Alessandra Colamatteo
- Treg Cell Laboratory, Dipartimento di Medicina Molecolare e Biotecnologie Mediche, Università degli Studi di Napoli "Federico II", Naples, Italy
| | - Fortunata Carbone
- Laboratorio di Immunologia, Istituto per L'Endocrinologia e L'Oncologia Sperimentale, Consiglio Nazionale Delle Ricerche (IEOS-CNR), Naples, Italy.,Unità di NeuroImmunologia, Fondazione Santa Lucia, Rome, Italy
| | - Sara Bruzzaniti
- Laboratorio di Immunologia, Istituto per L'Endocrinologia e L'Oncologia Sperimentale, Consiglio Nazionale Delle Ricerche (IEOS-CNR), Naples, Italy.,Dipartimento di Biologia, Università degli Studi di Napoli "Federico II", Naples, Italy
| | - Mario Galgani
- Treg Cell Laboratory, Dipartimento di Medicina Molecolare e Biotecnologie Mediche, Università degli Studi di Napoli "Federico II", Naples, Italy.,Laboratorio di Immunologia, Istituto per L'Endocrinologia e L'Oncologia Sperimentale, Consiglio Nazionale Delle Ricerche (IEOS-CNR), Naples, Italy
| | - Clorinda Fusco
- Treg Cell Laboratory, Dipartimento di Medicina Molecolare e Biotecnologie Mediche, Università degli Studi di Napoli "Federico II", Naples, Italy
| | - Giorgia Teresa Maniscalco
- Dipartimento di Neurologia, Centro Regionale Sclerosi Multipla, Azienda Ospedaliera "A. Cardarelli", Naples, Italy
| | - Francesca Di Rella
- Clinical and Experimental Senology, Istituto Nazionale Tumori, IRCCS, Fondazione G. Pascale, Naples, Italy
| | | | - Veronica De Rosa
- Laboratorio di Immunologia, Istituto per L'Endocrinologia e L'Oncologia Sperimentale, Consiglio Nazionale Delle Ricerche (IEOS-CNR), Naples, Italy.,Unità di NeuroImmunologia, Fondazione Santa Lucia, Rome, Italy
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71
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Cortés-Hernández A, Alvarez-Salazar E, Arteaga-Cruz S, Alberu-Gómez J, Soldevila G. Ex vivo expansion of regulatory T cells from long-term Belatacept-treated kidney transplant patients restores their phenotype and suppressive function but not their FOXP3 TSDR demethylation status. Cell Immunol 2020; 348:104044. [PMID: 32005344 DOI: 10.1016/j.cellimm.2020.104044] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2019] [Revised: 01/08/2020] [Accepted: 01/11/2020] [Indexed: 02/09/2023]
Abstract
We recently reported that Tregs from long-term Belatacept-treated kidney transplant patients displayed an altered phenotype and impaired suppressive function compared to Tregs from healthy controls. However, it remains unknown whether ex vivo expansion of Tregs from patients who underwent long-term immunosuppression may be feasible to be used in their treatment. In this work, Tregs from Belatacept-treated patients were polyclonally expanded in vitro in the presence of rapamycin and IL-2. After four weeks of expansion, Tregs from patients expressed high levels of FOXP3, CD25, CTLA-4, Helios and CCR7, and showed strong suppressive activity, even in the presence of pro-inflammatory cytokines. However, FOXP3 TSDR demethylation remained lower in expanded Tregs from Belatacept-treated patients compared to healthy control Tregs. These data suggest that ex vivo expansion of Tregs from patients undergoing long-term immunosuppression may require the use of epigenetic modifying agents to stabilize FOXP3 expression to be considered as treatment in kidney transplant patients.
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Affiliation(s)
- A Cortés-Hernández
- Department of Immunology, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | - E Alvarez-Salazar
- Department of Immunology, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | - S Arteaga-Cruz
- Department of Immunology, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | - J Alberu-Gómez
- Tecnológico de Monterrey, Escuela de Medicina y Ciencias de la Salud, Ave. Morones Prieto 3000, Monterrey, N.L., México 64710, Mexico
| | - G Soldevila
- Department of Immunology, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Mexico City, Mexico.
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72
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Abstract
Foxp3-expressing CD4+ regulatory T (Treg) cells play key roles in the prevention of autoimmunity and the maintenance of immune homeostasis and represent a major barrier to the induction of robust antitumor immune responses. Thus, a clear understanding of the mechanisms coordinating Treg cell differentiation is crucial for understanding numerous facets of health and disease and for developing approaches to modulate Treg cells for clinical benefit. Here, we discuss current knowledge of the signals that coordinate Treg cell development, the antigen-presenting cell types that direct Treg cell selection, and the nature of endogenous Treg cell ligands, focusing on evidence from studies in mice. We also highlight recent advances in this area and identify key unanswered questions.
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Affiliation(s)
- Peter A Savage
- Department of Pathology, University of Chicago, Chicago, Illinois 60637, USA; , ,
| | - David E J Klawon
- Department of Pathology, University of Chicago, Chicago, Illinois 60637, USA; , ,
| | - Christine H Miller
- Department of Pathology, University of Chicago, Chicago, Illinois 60637, USA; , ,
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73
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Liu J, Zhong X, He Z, Zhang J, Bai J, Liu G, Liang Y, Ya L, Qin X. Erythromycin Suppresses the Cigarette Smoke Extract-Exposed Dendritic Cell-Mediated Polarization of CD4 + T Cells into Th17 Cells. J Immunol Res 2020; 2020:1387952. [PMID: 32411785 PMCID: PMC7201779 DOI: 10.1155/2020/1387952] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2019] [Revised: 12/24/2019] [Accepted: 01/03/2020] [Indexed: 11/18/2022] Open
Abstract
Cigarette smoke is a major effector of chronic obstructive pulmonary disease (COPD), and Th17 cells and dendritic cells (DCs) involve in the pathogenesis of COPD. Previous studies have demonstrated the anti-inflammatory effects of macrolides. However, the effects of macrolides on the cigarette smoke extract- (CSE-) induced immune response are unclear. Accordingly, in this study, we evaluated the effects of erythromycin (EM) on CSE-exposed DCs polarizing naïve CD4+ T cells into Th17 cells. DCs were generated from bone marrow-derived mononuclear cells isolated from male BALB/c mice and divided into five groups: control DC group, CSE-exposed DC group, CD40-antibody-blocked CSE-exposed DC group, and EM-treated CSE-exposed DC group. The function of polarizing CD4+ T cells into Th17 cells induced by all four groups of DCs was assayed based on the mixed lymphocyte reaction (MLR) of naïve CD4+ T cells. CD40 expression in DCs in the CSE-exposed group increased significantly compared with that in the control group (P < 0.05). The Th17 cells in the CSE-exposed DC/MLR group increased significantly compared with those in the control DC/MLR group (P < 0.05). Moreover, Th17 cells in the CD40-blocked CSE-exposed DC/MLR group and EM-treated CSE-exposed DC/MLR group were reduced compared with those in the CSE-exposed DC/MLR group (P < 0.05). Thus, these findings suggested that EM suppressed the CSE-exposed DC-mediated polarization of CD4+ T cells into Th17 cells and that this effect may be mediated through inhibition of the CD40/CD40L pathway.
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Affiliation(s)
- Jifeng Liu
- Department of Respiratory Disease, First Affiliated Hospital of Guangxi Medical University, Nanning 530021, China
| | - Xiaoning Zhong
- Department of Respiratory Disease, First Affiliated Hospital of Guangxi Medical University, Nanning 530021, China
| | - Zhiyi He
- Department of Respiratory Disease, First Affiliated Hospital of Guangxi Medical University, Nanning 530021, China
| | - Jianquan Zhang
- Department of Respiratory Disease, First Affiliated Hospital of Guangxi Medical University, Nanning 530021, China
| | - Jing Bai
- Department of Respiratory Disease, First Affiliated Hospital of Guangxi Medical University, Nanning 530021, China
| | - Guangnan Liu
- Department of Respiratory Disease, Second Affiliated Hospital of Guangxi Medical University, Nanning 530007, China
| | - Yi Liang
- Department of Respiratory Disease, First Affiliated Hospital of Guangxi Medical University, Nanning 530021, China
| | - Leilei Ya
- Department of Respiratory Disease, First Affiliated Hospital of Guangxi Medical University, Nanning 530021, China
| | - Xianglin Qin
- Department of Respiratory Disease, First Affiliated Hospital of Guangxi Medical University, Nanning 530021, China
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74
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Ding T, Niu H, Zhao X, Gao C, Li X, Wang C. T-Follicular Regulatory Cells: Potential Therapeutic Targets in Rheumatoid Arthritis. Front Immunol 2019; 10:2709. [PMID: 31849938 PMCID: PMC6901970 DOI: 10.3389/fimmu.2019.02709] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2019] [Accepted: 11/04/2019] [Indexed: 12/18/2022] Open
Abstract
Rheumatoid arthritis (RA) is an incurable aggressive chronic inflammatory joint disease with a worldwide prevalence. High levels of autoantibodies and chronic inflammation may be involved in the pathology. Notably, T follicular regulatory (Tfr) cells are critical mediators of T follicular helper (Tfh) cell generation and antibody production in the germinal center (GC) reaction. Changes in the number and function of Tfr cells may lead to dysregulation of the GC reaction and the production of aberrant autoantibodies. Regulation of the function and number of Tfr cells could be an effective strategy for precisely controlling antibody production, reestablishing immune homeostasis, and thereby improving the outcome of RA. This review summarizes advances in our understanding of the biology and functions of Tfr cells. The involvement of Tfr cells and other immune cell subsets in RA is also discussed. Furthermore, we highlight the potential therapeutic targets related to Tfr cells and restoring the Tfr/Tfh balance via cytokines, microRNAs, the mammalian target of rapamycin (mTOR) signaling pathway, and the gut microbiota, which will facilitate further research on RA and other immune-mediated diseases.
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Affiliation(s)
- Tingting Ding
- Department of Rheumatology, The Second Hospital of Shanxi Medical University, Taiyuan, China
| | - Hongqing Niu
- Department of Rheumatology, The Second Hospital of Shanxi Medical University, Taiyuan, China
| | - Xiangcong Zhao
- Department of Rheumatology, The Second Hospital of Shanxi Medical University, Taiyuan, China
| | - Chong Gao
- Pathology, Joint Program in Transfusion Medicine, Brigham and Women's Hospital and Boston Children's Hospital, Harvard Medical School, Boston, MA, United States
| | - Xiaofeng Li
- Department of Rheumatology, The Second Hospital of Shanxi Medical University, Taiyuan, China
| | - Caihong Wang
- Department of Rheumatology, The Second Hospital of Shanxi Medical University, Taiyuan, China
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75
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Zhang Z, Zhou X. Foxp3 Instability Helps tTregs Distinguish Self and Non-self. Front Immunol 2019; 10:2226. [PMID: 31608056 PMCID: PMC6769115 DOI: 10.3389/fimmu.2019.02226] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2019] [Accepted: 09/03/2019] [Indexed: 12/02/2022] Open
Abstract
Regulatory T cells (Tregs) are small subsets of CD4 T cells that play a central role in the controlling of immune tolerance. Tregs are either generated in the thymus (tTregs) or the periphery (pTregs), and both express the master transcription factor Foxp3. Stable expression of Foxp3 is important for the maintenance of Tregs identity and their suppressive function. Similar to conventional T cells, Tregs can recognize both self- and non-self-antigens, and TCR engagement leads to Treg activation and the generation of effector Tregs. Emerging shreds of evidence suggest Tregs are not always stable, even fully committed mature tTregs, and can lose foxp3 expression and programming to effector-like T cells. In this review, we summarize recent findings in Treg instability and the intrinsic and extrinsic mechanisms in controlling the Foxp3 expression. Finally, we propose a new hypothesis that Foxp3 instability might help tTregs distinguish between self and non-self-antigens.
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Affiliation(s)
- Zhongmei Zhang
- Experimental Immunology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD, United States
| | - Xuyu Zhou
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences (CAS), Beijing, China.,Savaid Medical School, University of Chinese Academy of Sciences, Beijing, China
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76
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Wedel J, Stack MP, Seto T, Sheehan MM, Flynn EA, Stillman IE, Kong SW, Liu K, Briscoe DM. T Cell-Specific Adaptor Protein Regulates Mitochondrial Function and CD4 + T Regulatory Cell Activity In Vivo following Transplantation. THE JOURNAL OF IMMUNOLOGY 2019; 203:2328-2338. [PMID: 31541025 DOI: 10.4049/jimmunol.1801604] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2018] [Accepted: 08/10/2019] [Indexed: 12/29/2022]
Abstract
The T cell-specific adaptor protein (TSAd), encoded by the SH2D2A gene, is an intracellular molecule that binds Lck to elicit signals that result in cytokine production in CD4+ T effector cells (Teff). Nevertheless, using Sh2d2a knockout (KO; also called TSAd-/-) mice, we find that alloimmune CD4+ Teff responses are fully competent in vivo. Furthermore, and contrary to expectations, we find that allograft rejection is accelerated in KO recipients of MHC class II-mismatched B6.C-H-2bm12 heart transplants versus wild-type (WT) recipients. Also, KO recipients of fully MHC-mismatched cardiac allografts are resistant to the graft-prolonging effects of costimulatory blockade. Using adoptive transfer models, we find that KO T regulatory cells (Tregs) are less efficient in suppressing Teff function and they produce IFN-γ following mitogenic activation. In addition, pyrosequencing demonstrated higher levels of methylation of CpG regions within the Treg-specific demethylated region of KO versus WT Tregs, suggesting that TSAd, in part, promotes Treg stability. By Western blot, Lck is absent in the mitochondria of KO Tregs, and reactive oxygen species production by mitochondria is reduced in KO versus WT Tregs. Full transcriptomic analysis demonstrated that the key mechanism of TSAd function in Tregs relates to its effects on cellular activation rather than intrinsic effects on mitochondria/metabolism. Nevertheless, KO Tregs compensate for a lack of activation by increasing the number of mitochondria per cell. Thus, TSAd serves as a critical cell-intrinsic molecule in CD4+Foxp3+ Tregs to regulate the translocation of Lck to mitochondria, cellular activation responses, and the development of immunoregulation following solid organ transplantation.
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Affiliation(s)
- Johannes Wedel
- Transplant Research Program, Boston Children's Hospital, Boston, MA 02115.,Division of Nephrology, Department of Pediatrics, Boston Children's Hospital, Boston, MA 02115.,Department of Pediatrics, Harvard Medical School, Boston, MA 02115
| | - Maria P Stack
- Transplant Research Program, Boston Children's Hospital, Boston, MA 02115.,Division of Nephrology, Department of Pediatrics, Boston Children's Hospital, Boston, MA 02115.,Department of Pediatrics, Harvard Medical School, Boston, MA 02115
| | - Tatsuichiro Seto
- Transplant Research Program, Boston Children's Hospital, Boston, MA 02115.,Division of Nephrology, Department of Pediatrics, Boston Children's Hospital, Boston, MA 02115.,Department of Pediatrics, Harvard Medical School, Boston, MA 02115
| | - Matthew M Sheehan
- Transplant Research Program, Boston Children's Hospital, Boston, MA 02115.,Division of Nephrology, Department of Pediatrics, Boston Children's Hospital, Boston, MA 02115
| | - Evelyn A Flynn
- Transplant Research Program, Boston Children's Hospital, Boston, MA 02115.,Division of Nephrology, Department of Pediatrics, Boston Children's Hospital, Boston, MA 02115.,Department of Pediatrics, Harvard Medical School, Boston, MA 02115
| | - Isaac E Stillman
- Department of Pathology, Beth Israel Deaconess Medical Center, Boston, MA 02215.,Department of Pathology, Harvard Medical School, Boston, MA 02115
| | - Sek Won Kong
- Department of Pediatrics, Harvard Medical School, Boston, MA 02115.,Computational Health Informatics Program, Boston Children's Hospital, Boston, MA 02115; and
| | - Kaifeng Liu
- Transplant Research Program, Boston Children's Hospital, Boston, MA 02115.,Division of Nephrology, Department of Pediatrics, Boston Children's Hospital, Boston, MA 02115.,Department of Pediatrics, Harvard Medical School, Boston, MA 02115.,Division of Pulmonary Medicine, Department of Medicine, Boston Children's Hospital, Boston, MA 02115
| | - David M Briscoe
- Transplant Research Program, Boston Children's Hospital, Boston, MA 02115; .,Division of Nephrology, Department of Pediatrics, Boston Children's Hospital, Boston, MA 02115.,Department of Pediatrics, Harvard Medical School, Boston, MA 02115
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77
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Gauthier JM, Harrison MS, Krupnick AS, Gelman AE, Kreisel D. The emerging role of regulatory T cells following lung transplantation. Immunol Rev 2019; 292:194-208. [PMID: 31536165 DOI: 10.1111/imr.12801] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2019] [Accepted: 08/27/2019] [Indexed: 12/13/2022]
Abstract
Regulatory T cells (Treg) have proven to be a powerful immunologic force in nearly every organ system and hold therapeutic potential for a wide range of diseases. Insights gained from non-transplant pathologies, such as infection, cancer, and autoimmunity, are now being translated to the field of solid organ transplantation, particularly for livers and kidneys. Recent insights from animal models of lung transplantation have established that Tregs play a vital role in suppressing rejection and facilitating tolerance of lung allografts, and such discoveries are being validated in human studies and preclinical trials. Given that long-term outcomes following lung transplantation remain profoundly limited by chronic rejection, Treg therapy holds the potential to significantly improve patient outcomes and should be aggressively investigated.
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Affiliation(s)
- Jason M Gauthier
- Division of Cardiothoracic Surgery, Department of Surgery, Washington University, Saint Louis, MO, USA
| | - M Shea Harrison
- Division of Cardiothoracic Surgery, Department of Surgery, Washington University, Saint Louis, MO, USA
| | - Alexander S Krupnick
- Division of Thoracic Surgery, Department of Surgery, University of Virginia, Charlottesville, VA, USA.,Carter Immunology Center, University of Virginia, Charlottesville, VA, USA
| | - Andrew E Gelman
- Division of Cardiothoracic Surgery, Department of Surgery, Washington University, Saint Louis, MO, USA.,Department of Pathology & Immunology, Washington University, Saint Louis, MO, USA
| | - Daniel Kreisel
- Division of Cardiothoracic Surgery, Department of Surgery, Washington University, Saint Louis, MO, USA.,Department of Pathology & Immunology, Washington University, Saint Louis, MO, USA
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78
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Policheni A, Horikawa K, Milla L, Kofler J, Bouillet P, Belz GT, O'Reilly LA, Goodnow CC, Strasser A, Gray DHD. CARD11 is dispensable for homeostatic responses and suppressive activity of peripherally induced FOXP3
+
regulatory T cells. Immunol Cell Biol 2019; 97:740-752. [DOI: 10.1111/imcb.12268] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2018] [Revised: 05/12/2019] [Accepted: 05/13/2019] [Indexed: 12/19/2022]
Affiliation(s)
- Antonia Policheni
- The Walter and Eliza Hall Institute of Medical Research Melbourne VIC Australia
- Department of Medical Biology The University of Melbourne Melbourne VIC Australia
| | - Keisuke Horikawa
- Australian Cancer Research Foundation Department of Cancer Biology and Therapeutics The John Curtin School of Medical Research The Australian National University Canberra ACT Australia
| | - Liz Milla
- The Walter and Eliza Hall Institute of Medical Research Melbourne VIC Australia
- Department of Medical Biology The University of Melbourne Melbourne VIC Australia
| | - Jennifer Kofler
- Australian Cancer Research Foundation Department of Cancer Biology and Therapeutics The John Curtin School of Medical Research The Australian National University Canberra ACT Australia
| | - Philippe Bouillet
- The Walter and Eliza Hall Institute of Medical Research Melbourne VIC Australia
- Department of Medical Biology The University of Melbourne Melbourne VIC Australia
| | - Gabrielle T Belz
- The Walter and Eliza Hall Institute of Medical Research Melbourne VIC Australia
- Department of Medical Biology The University of Melbourne Melbourne VIC Australia
| | - Lorraine A O'Reilly
- The Walter and Eliza Hall Institute of Medical Research Melbourne VIC Australia
- Department of Medical Biology The University of Melbourne Melbourne VIC Australia
| | | | - Andreas Strasser
- The Walter and Eliza Hall Institute of Medical Research Melbourne VIC Australia
- Department of Medical Biology The University of Melbourne Melbourne VIC Australia
| | - Daniel HD Gray
- The Walter and Eliza Hall Institute of Medical Research Melbourne VIC Australia
- Department of Medical Biology The University of Melbourne Melbourne VIC Australia
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79
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Recent advances in the study of regulatory T cells in gastric cancer. Int Immunopharmacol 2019; 73:560-567. [PMID: 31181438 DOI: 10.1016/j.intimp.2019.05.009] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Revised: 05/05/2019] [Accepted: 05/06/2019] [Indexed: 12/15/2022]
Abstract
Gastric cancer (GC), which features a complex pathogenesis and mechanism, remains refractory. FOXP3+ regulatory T cells (Tregs), which have been implicated in the progression of gastric cancer, play an immunosuppressive role in the tumor microenvironment. However, the prognostic value of Treg infiltration is still controversial in GC patients. Recently, the association of Tregs with the clinicopathological characteristics of GC patients, the prognostic value of Tregs alone or its combination with other factors to GC patients, the role of Tregs in GC tumor microenvironment, clinical applications and Tregs-targeted therapies for GC patients have become hot issues. In this review, we are going to discuss these scientific researches which focused on these topics.
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80
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Wakamatsu E, Omori H, Tabata Y, Akieda Y, Watanabe S, Ogawa S, Abe R. CD28 co-stimulation is dispensable for the steady state homeostasis of intestinal regulatory T cells. Int Immunol 2019; 30:171-180. [PMID: 29425339 DOI: 10.1093/intimm/dxy013] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2017] [Accepted: 02/02/2018] [Indexed: 12/13/2022] Open
Abstract
It is well-established that CD28 co-stimulation is required for the development and the proliferation of thymus-derived regulatory T cells (tTregs). Meanwhile, the role of CD28 co-stimulation in the homeostasis of peripherally derived Tregs (pTregs) remains unclear. To clarify this issue, we analyzed Tregs in small and large intestines (SI and LI), the principle sites of pTreg development. Interestingly, and different from in the thymus, Tregs were abundant in the intestines of CD28-/- mice, and most of them were phenotypically pTregs. We showed that CD28-/- naive T cells differentiated into pTregs in the LI after oral exposure to antigens and that CD28-/- pTregs in the LI had the same highly proliferative activity as CD28+/- cells. CD28-/- pTregs acquired these Treg-specific features at transcriptional and epigenetics levels. On the other hand, some immune suppressive molecules were down-regulated in CD28-/- pTregs. Correspondingly, the suppressive activity of CD28-/- pTregs was weaker than CD28+/+ cells. These results indicate that the homeostasis of pTregs in the intestines is maintained even in the absence of CD28, whereas CD28 is required for the maximal suppressive activity of intestinal pTregs.
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Affiliation(s)
- Ei Wakamatsu
- Division of Immunobiology, Tokyo University of Science, Yamazaki, Noda City, Chiba, Japan.,Department of Immunology, Tokyo Medical University, Shinjuku, Shinjuku-ku, Tokyo, Japan
| | - Hiroki Omori
- Division of Immunobiology, Tokyo University of Science, Yamazaki, Noda City, Chiba, Japan
| | - Yuki Tabata
- Division of Immunobiology, Tokyo University of Science, Yamazaki, Noda City, Chiba, Japan
| | - Yuki Akieda
- Division of Immunobiology, Tokyo University of Science, Yamazaki, Noda City, Chiba, Japan
| | - Shiho Watanabe
- Division of Immunobiology, Tokyo University of Science, Yamazaki, Noda City, Chiba, Japan
| | - Shuhei Ogawa
- Division of Experimental Animal Immunology, Research Institute for Biomedical Sciences, Tokyo University of Science, Yamazaki, Noda City, Chiba, Japan
| | - Ryo Abe
- Division of Immunobiology, Tokyo University of Science, Yamazaki, Noda City, Chiba, Japan
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81
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Gogulamudi VR, Mani I, Subramanian U, Pandey KN. Genetic disruption of Npr1 depletes regulatory T cells and provokes high levels of proinflammatory cytokines and fibrosis in the kidneys of female mutant mice. Am J Physiol Renal Physiol 2019; 316:F1254-F1272. [PMID: 30943067 DOI: 10.1152/ajprenal.00621.2018] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
The present study was designed to determine the effects of gene knockout of guanylyl cyclase/natriuretic peptide receptor-A (GC-A/NPRA) on immunogenic responses affecting kidney function and blood pressure (BP) in Npr1 (coding for GC-A/NPRA)-null mutant mice. We used female Npr1 gene-disrupted (Npr1-/-, 0 copy), heterozygous (Npr1+/-, 1 copy), wild-type (Npr1+/+, 2 copy), and gene-duplicated (Npr1++/++, 4 copy) mice. Expression levels of Toll-like receptor (TLR)2/TLR4 mRNA were increased 4- to 5-fold in 1-copy mice and 6- to 10-fold in 0-copy mice; protein levels were increased 2.5- to 3-fold in 1-copy mice and 4- to 5-fold in 0-copy mice. Expression of proinflammatory cytokines and BP was significantly elevated in 1-copy and 0-copy mice compared with 2-copy and 4-copy mice. In addition, 0-copy and 1-copy mice exhibited drastic reductions in regulatory T cells (Tregs). After rapamycin treatment, Tregs were increased by 17% (P < 0.001) in 0-copy mice and 8% (P < 0.001) in 1-copy mice. Renal mRNA and protein levels of TLR2 and TLR4 were decreased by 70% in 0-copy mice and 50% in 1-copy mice. There were significantly higher levels of Tregs and very low levels of TLR2/TLR4 expression in 4-copy mice (P < 0.001). These findings indicate that the disruption of Npr1 in female mice triggers renal immunogenic pathways, which transactivate the expression of proinflammatory cytokines and renal fibrosis with elevated BP in mutant animals. The data suggest that rapamycin treatment attenuates proinflammatory cytokine expression, dramatically increases anti-inflammatory cytokines, and substantially reduces BP and renal fibrosis in mutant animals.
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Affiliation(s)
| | - Indra Mani
- Department of Physiology, Tulane University Health Sciences Center, School of Medicine , New Orleans, Louisiana
| | - Umadevi Subramanian
- Department of Physiology, Tulane University Health Sciences Center, School of Medicine , New Orleans, Louisiana
| | - Kailash N Pandey
- Department of Physiology, Tulane University Health Sciences Center, School of Medicine , New Orleans, Louisiana
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82
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LKB1 expressed in dendritic cells governs the development and expansion of thymus-derived regulatory T cells. Cell Res 2019; 29:406-419. [PMID: 30940876 DOI: 10.1038/s41422-019-0161-8] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2018] [Accepted: 03/08/2019] [Indexed: 01/06/2023] Open
Abstract
Liver Kinase B1 (LKB1) plays a key role in cellular metabolism by controlling AMPK activation. However, its function in dendritic cell (DC) biology has not been addressed. Here, we find that LKB1 functions as a critical brake on DC immunogenicity, and when lost, leads to reduced mitochondrial fitness and increased maturation, migration, and T cell priming of peripheral DCs. Concurrently, loss of LKB1 in DCs enhances their capacity to promote output of regulatory T cells (Tregs) from the thymus, which dominates the outcome of peripheral immune responses, as suggested by increased resistance to asthma and higher susceptibility to cancer in CD11cΔLKB1 mice. Mechanistically, we find that loss of LKB1 specifically primes thymic CD11b+ DCs to facilitate thymic Treg development and expansion, which is independent from AMPK signalling, but dependent on mTOR and enhanced phospholipase C β1-driven CD86 expression. Together, our results identify LKB1 as a critical regulator of DC-driven effector T cell and Treg responses both in the periphery and the thymus.
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83
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Łyszkiewicz M, Winter SJ, Witzlau K, Föhse L, Brownlie R, Puchałka J, Verheyden NA, Kunze-Schumacher H, Imelmann E, Blume J, Raha S, Sekiya T, Yoshimura A, Frueh JT, Ullrich E, Huehn J, Weiss S, Gutierrez MG, Prinz I, Zamoyska R, Ziętara N, Krueger A. miR-181a/b-1 controls thymic selection of Treg cells and tunes their suppressive capacity. PLoS Biol 2019; 17:e2006716. [PMID: 30856173 PMCID: PMC6428341 DOI: 10.1371/journal.pbio.2006716] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2018] [Revised: 03/21/2019] [Accepted: 02/27/2019] [Indexed: 12/13/2022] Open
Abstract
The interdependence of selective cues during development of regulatory T cells (Treg cells) in the thymus and their suppressive function remains incompletely understood. Here, we analyzed this interdependence by taking advantage of highly dynamic changes in expression of microRNA 181 family members miR-181a-1 and miR-181b-1 (miR-181a/b-1) during late T-cell development with very high levels of expression during thymocyte selection, followed by massive down-regulation in the periphery. Loss of miR-181a/b-1 resulted in inefficient de novo generation of Treg cells in the thymus but simultaneously permitted homeostatic expansion in the periphery in the absence of competition. Modulation of T-cell receptor (TCR) signal strength in vivo indicated that miR-181a/b-1 controlled Treg-cell formation via establishing adequate signaling thresholds. Unexpectedly, miR-181a/b-1-deficient Treg cells displayed elevated suppressive capacity in vivo, in line with elevated levels of cytotoxic T-lymphocyte-associated 4 (CTLA-4) protein, but not mRNA, in thymic and peripheral Treg cells. Therefore, we propose that intrathymic miR-181a/b-1 controls development of Treg cells and imposes a developmental legacy on their peripheral function.
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MESH Headings
- Animals
- Flow Cytometry
- Mice
- Mice, Knockout
- MicroRNAs/genetics
- MicroRNAs/metabolism
- Microscopy, Confocal
- Nuclear Receptor Subfamily 4, Group A, Member 1/genetics
- Nuclear Receptor Subfamily 4, Group A, Member 1/metabolism
- Nuclear Receptor Subfamily 4, Group A, Member 2/genetics
- Nuclear Receptor Subfamily 4, Group A, Member 2/metabolism
- T-Lymphocytes, Regulatory/metabolism
- Thymocytes/metabolism
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Affiliation(s)
- Marcin Łyszkiewicz
- Institute of Immunology, Hannover Medical School, Hannover, Germany
- Institute for Immunology, Ludwig-Maximilians University, Planegg-Martiensried, Germany
| | - Samantha J. Winter
- Institute for Molecular Medicine, Goethe University Frankfurt am Main, Frankfurt, Germany
| | - Katrin Witzlau
- Institute of Immunology, Hannover Medical School, Hannover, Germany
| | - Lisa Föhse
- Institute of Immunology, Hannover Medical School, Hannover, Germany
| | - Rebecca Brownlie
- Institute for Immunology and Infection Research, The University of Edinburgh, Edinburgh, United Kingdom
| | - Jacek Puchałka
- Department of Pediatrics, Dr. von Hauner Kinderspital, Ludwig-Maximilians University, Munich, Germany
| | - Nikita A. Verheyden
- Institute for Molecular Medicine, Goethe University Frankfurt am Main, Frankfurt, Germany
| | - Heike Kunze-Schumacher
- Institute for Molecular Medicine, Goethe University Frankfurt am Main, Frankfurt, Germany
| | - Esther Imelmann
- Institute for Molecular Medicine, Goethe University Frankfurt am Main, Frankfurt, Germany
| | - Jonas Blume
- Institute of Immunology, Hannover Medical School, Hannover, Germany
| | - Solaiman Raha
- Institute of Immunology, Hannover Medical School, Hannover, Germany
| | - Takashi Sekiya
- Department of Microbiology and Immunology, Keio University School of Medicine, Tokyo, Japan
| | - Akihiko Yoshimura
- Department of Microbiology and Immunology, Keio University School of Medicine, Tokyo, Japan
| | - Jochen T. Frueh
- Experimental Immunology, Department for Children and Adolescents Medicine, Hospital of the Goethe University Frankfurt, Frankfurt, Germany
- LOEWE Center for Cell and Gene Therapy, Goethe University, Frankfurt, Germany
| | - Evelyn Ullrich
- Experimental Immunology, Department for Children and Adolescents Medicine, Hospital of the Goethe University Frankfurt, Frankfurt, Germany
- LOEWE Center for Cell and Gene Therapy, Goethe University, Frankfurt, Germany
| | - Jochen Huehn
- Department of Experimental Immunology, Helmholtz Centre for Infection Research, Braunschweig, Germany
| | - Siegfried Weiss
- Institute of Immunology, Hannover Medical School, Hannover, Germany
| | | | - Immo Prinz
- Institute of Immunology, Hannover Medical School, Hannover, Germany
| | - Rose Zamoyska
- Institute for Immunology and Infection Research, The University of Edinburgh, Edinburgh, United Kingdom
| | - Natalia Ziętara
- Institute of Immunology, Hannover Medical School, Hannover, Germany
- Institute for Immunology, Ludwig-Maximilians University, Planegg-Martiensried, Germany
| | - Andreas Krueger
- Institute of Immunology, Hannover Medical School, Hannover, Germany
- Institute for Molecular Medicine, Goethe University Frankfurt am Main, Frankfurt, Germany
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85
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Romano M, Fanelli G, Albany CJ, Giganti G, Lombardi G. Past, Present, and Future of Regulatory T Cell Therapy in Transplantation and Autoimmunity. Front Immunol 2019; 10:43. [PMID: 30804926 PMCID: PMC6371029 DOI: 10.3389/fimmu.2019.00043] [Citation(s) in RCA: 351] [Impact Index Per Article: 70.2] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2018] [Accepted: 01/09/2019] [Indexed: 12/25/2022] Open
Abstract
Regulatory T cells (Tregs) are important for the induction and maintenance of peripheral tolerance therefore, they are key in preventing excessive immune responses and autoimmunity. In the last decades, several reports have been focussed on understanding the biology of Tregs and their mechanisms of action. Preclinical studies have demonstrated the ability of Tregs to delay/prevent graft rejection and to control autoimmune responses following adoptive transfer in vivo. Due to these promising results, Tregs have been extensively studied as a potential new tool for the prevention of graft rejection and/or the treatment of autoimmune diseases. Currently, solid organ transplantation remains the treatment of choice for end-stage organ failure. However, chronic rejection and the ensuing side effects of immunosuppressants represent the main limiting factors for organ acceptance and patient survival. Autoimmune disorders are chronic diseases caused by the breakdown of tolerance against self-antigens. This is triggered either by a numerical or functional Treg defect, or by the resistance of effector T cells to suppression. In this scenario, patients receiving high doses of immunosuppressant are left susceptible to life-threatening opportunistic infections and have increased risk of malignancies. In the last 10 years, a few phase I clinical trials aiming to investigate safety and feasibility of Treg-based therapy have been completed and published, whilst an increasing numbers of trials are still ongoing. The first results showed safety and feasibility of Treg therapy and phase II clinical trials are already enrolling. In this review, we describe our understanding of Tregs focussing primarily on their ontogenesis, mechanisms of action and methods used in the clinic for isolation and expansion. Furthermore, we will describe the ongoing studies and the results from the first clinical trials with Tregs in the setting of solid organ transplantation and autoimmune disorders. Finally, we will discuss strategies to further improve the success of Treg therapy.
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Affiliation(s)
- Marco Romano
- Immunoregulation Laboratory, MRC Centre for Transplantation, School of Immunology & Microbial Sciences, King's College London, London, United Kingdom
| | - Giorgia Fanelli
- Immunoregulation Laboratory, MRC Centre for Transplantation, School of Immunology & Microbial Sciences, King's College London, London, United Kingdom
| | - Caraugh Jane Albany
- Immunoregulation Laboratory, MRC Centre for Transplantation, School of Immunology & Microbial Sciences, King's College London, London, United Kingdom
| | - Giulio Giganti
- Immunoregulation Laboratory, MRC Centre for Transplantation, School of Immunology & Microbial Sciences, King's College London, London, United Kingdom.,Scuola di Specializzazione in Medicina Interna, Universita' degli Studi di Milano, Milan, Italy
| | - Giovanna Lombardi
- Immunoregulation Laboratory, MRC Centre for Transplantation, School of Immunology & Microbial Sciences, King's College London, London, United Kingdom
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86
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Wing JB, Tay C, Sakaguchi S. Control of Regulatory T Cells by Co-signal Molecules. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2019; 1189:179-210. [DOI: 10.1007/978-981-32-9717-3_7] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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87
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Signal Transduction Via Co-stimulatory and Co-inhibitory Receptors. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2019; 1189:85-133. [PMID: 31758532 DOI: 10.1007/978-981-32-9717-3_4] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
T-cell receptor (TCR)-mediated antigen-specific stimulation is essential for initiating T-cell activation. However, signaling through the TCR alone is not sufficient for inducing an effective response. In addition to TCR-mediated signaling, signaling through antigen-independent co-stimulatory or co-inhibitory receptors is critically important not only for the full activation and functional differentiation of T cells but also for the termination and suppression of T-cell responses. Many studies have investigated the signaling pathways underlying the function of each molecular component. Co-stimulatory and co-inhibitory receptors have no kinase activity, but their cytoplasmic region contains unique functional motifs and potential phosphorylation sites. Engagement of co-stimulatory receptors leads to recruitment of specific binding partners, such as adaptor molecules, kinases, and phosphatases, via recognition of a specific motif. Consequently, each co-stimulatory receptor transduces a unique pattern of signaling pathways. This review focuses on our current understanding of the intracellular signaling pathways provided by co-stimulatory and co-inhibitory molecules, including B7:CD28 family members, immunoglobulin, and members of the tumor necrosis factor receptor superfamily.
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Suryadevara CM, Desai R, Farber SH, Choi BD, Swartz AM, Shen SH, Gedeon PC, Snyder DJ, Herndon JE, Healy P, Reap EA, Archer GE, Fecci PE, Sampson JH, Sanchez-Perez L. Preventing Lck Activation in CAR T Cells Confers Treg Resistance but Requires 4-1BB Signaling for Them to Persist and Treat Solid Tumors in Nonlymphodepleted Hosts. Clin Cancer Res 2019; 25:358-368. [PMID: 30425092 PMCID: PMC6390292 DOI: 10.1158/1078-0432.ccr-18-1211] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Revised: 07/31/2018] [Accepted: 11/08/2018] [Indexed: 11/16/2022]
Abstract
PURPOSE Chimeric antigen receptor (CAR) T cells have shown promise against solid tumors, but their efficacy has been limited, due in part, to immunosuppression by CD4+FoxP3+ regulatory T cells (Tregs). Although lymphodepletion is commonly used to deplete Tregs, these regimens are nonspecific, toxic, and provide only a narrow window before Tregs repopulate hosts. Importantly, CARs have also been shown to inadvertently potentiate Tregs by providing a source of IL2 for Treg consumption. We explored whether disruption of the IL2 axis would confer efficacy against solid tumors without the need for lymphodepletion. EXPERIMENTAL DESIGN We developed second- (CD28z) and third- (CD28-4-1BBz) generation CARs targeting EGFRvIII. To eliminate secretion of IL2, 2 amino acid substitutions were introduced in the PYAP Lck-binding motif of the CD28 domain (ΔCD28). We evaluated CARs against B16 melanomas expressing EGFRvIII. RESULTS CD28z CARs failed to engraft in vivo. Although 4-1BB addition improved expansion, CD28-4-1BBz CARs required lymphodepletion to treat solid tumors. CARs deficient in Lck signaling, however, significantly retarded tumor growth without a need for lymphodepletion and this was dependent on inclusion of 4-1BB. To evaluate CAR vulnerability to Tregs, we lymphodepleted mice and transferred CARs alone or with purified Tregs. Cotransfer with Tregs abrogated the efficacy of CD28-4-1BBz CARs, whereas the efficacy of ΔCD28-4-1BBz CARs remained unperturbed. CONCLUSIONS In the absence of lymphodepletion, CARs targeting solid tumors are hindered by Treg immunosuppression and poor persistence. Here, CARs were modified to circumvent Treg suppression and to simultaneously improve in vivo engraftment. Modified CARs treated solid tumors without a need for lymphodepletion.
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Affiliation(s)
- Carter M Suryadevara
- Department of Neurosurgery, Duke Brain Tumor Immunotherapy Program, Duke University Medical Center, Durham, North Carolina
- The Preston Robert Tisch Brain Tumor Center, Duke University Medical Center, Durham, North Carolina
- Department of Pathology, Duke University Medical Center, Durham, North Carolina
| | - Rupen Desai
- Department of Neurosurgery, Duke Brain Tumor Immunotherapy Program, Duke University Medical Center, Durham, North Carolina
- The Preston Robert Tisch Brain Tumor Center, Duke University Medical Center, Durham, North Carolina
| | - S Harrison Farber
- Department of Neurosurgery, Duke Brain Tumor Immunotherapy Program, Duke University Medical Center, Durham, North Carolina
- The Preston Robert Tisch Brain Tumor Center, Duke University Medical Center, Durham, North Carolina
| | - Bryan D Choi
- Department of Neurosurgery, Duke Brain Tumor Immunotherapy Program, Duke University Medical Center, Durham, North Carolina
- The Preston Robert Tisch Brain Tumor Center, Duke University Medical Center, Durham, North Carolina
- Department of Pathology, Duke University Medical Center, Durham, North Carolina
| | - Adam M Swartz
- Department of Neurosurgery, Duke Brain Tumor Immunotherapy Program, Duke University Medical Center, Durham, North Carolina
- The Preston Robert Tisch Brain Tumor Center, Duke University Medical Center, Durham, North Carolina
- Department of Pathology, Duke University Medical Center, Durham, North Carolina
| | - Steven H Shen
- Department of Neurosurgery, Duke Brain Tumor Immunotherapy Program, Duke University Medical Center, Durham, North Carolina
- The Preston Robert Tisch Brain Tumor Center, Duke University Medical Center, Durham, North Carolina
- Department of Pathology, Duke University Medical Center, Durham, North Carolina
| | - Patrick C Gedeon
- Department of Neurosurgery, Duke Brain Tumor Immunotherapy Program, Duke University Medical Center, Durham, North Carolina
- The Preston Robert Tisch Brain Tumor Center, Duke University Medical Center, Durham, North Carolina
| | - David J Snyder
- Department of Neurosurgery, Duke Brain Tumor Immunotherapy Program, Duke University Medical Center, Durham, North Carolina
- The Preston Robert Tisch Brain Tumor Center, Duke University Medical Center, Durham, North Carolina
| | - James E Herndon
- Department of Biostatistics and Bioinformatics, Duke University Medical Center, Durham, North Carolina
| | - Patrick Healy
- Department of Biostatistics and Bioinformatics, Duke University Medical Center, Durham, North Carolina
| | - Elizabeth A Reap
- Department of Neurosurgery, Duke Brain Tumor Immunotherapy Program, Duke University Medical Center, Durham, North Carolina
- The Preston Robert Tisch Brain Tumor Center, Duke University Medical Center, Durham, North Carolina
| | - Gary E Archer
- Department of Neurosurgery, Duke Brain Tumor Immunotherapy Program, Duke University Medical Center, Durham, North Carolina
- The Preston Robert Tisch Brain Tumor Center, Duke University Medical Center, Durham, North Carolina
- Department of Pathology, Duke University Medical Center, Durham, North Carolina
| | - Peter E Fecci
- Department of Neurosurgery, Duke Brain Tumor Immunotherapy Program, Duke University Medical Center, Durham, North Carolina
- The Preston Robert Tisch Brain Tumor Center, Duke University Medical Center, Durham, North Carolina
- Department of Pathology, Duke University Medical Center, Durham, North Carolina
| | - John H Sampson
- Department of Neurosurgery, Duke Brain Tumor Immunotherapy Program, Duke University Medical Center, Durham, North Carolina.
- The Preston Robert Tisch Brain Tumor Center, Duke University Medical Center, Durham, North Carolina
- Department of Pathology, Duke University Medical Center, Durham, North Carolina
| | - Luis Sanchez-Perez
- Department of Neurosurgery, Duke Brain Tumor Immunotherapy Program, Duke University Medical Center, Durham, North Carolina.
- The Preston Robert Tisch Brain Tumor Center, Duke University Medical Center, Durham, North Carolina
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Wang J, Yang J, Yan Y, Zhu Z, Mu Y, Wang X, Zhang J, Liu L, Zhao F, Chi Y. Effect of adoptive transfer of CD4 +CD25 +Foxp3 + Treg induced by trichostatin A on the prevention of spontaneous abortion. J Reprod Immunol 2018; 131:30-35. [PMID: 30634133 DOI: 10.1016/j.jri.2018.12.002] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2016] [Revised: 09/24/2018] [Accepted: 12/25/2018] [Indexed: 11/17/2022]
Abstract
OBJECTIVE To investigate whether epigenetic modification of CD4+CD25- T-cells in vitro can make up for the inadequacy of CD4+CD25+Foxp3+ Treg in animal model of spontaneous abortion and prevent immune response-mediated spontaneous abortion. METHODS Trichostatin A (TSA) was applied to inhibit histone deacetylases (HDACs) and thereby to epigenetically modify the special location of Foxp3 gene in CD4+CD25- T-cells of CBA/J mice. The expressions of CD25, Foxp3, CTLA-4 and PD-1 of CD4+ T cells isolated from spleen of mice were characterized by flow cytometric analysis. Concentrations of transforming growth factor- β (TGF-β) and IL-10 in the supernatants of cultured Treg were measured using ELISA. The purified CD4+ T cells treated with different reagents were injected into pregnant CBA/J mice mated with DBA/2J males on Day 1 and 4 of pregnancy, respectively. The embryo resorption rate was assessed on Day 14 of pregnancy. RESULTS TSA treatment significantly increased the population of CD4+CD25+Foxp3+ iTreg. Those TSA induced Treg expressed high levels of PD-1 and CTLA-4, and secreted high levels of TGF-β and IL-10. Adoptive transfer of those iTreg at both early stage and implantation of stage of pregnancy significantly increased population of CD4+CD25+Foxp3+ Treg in spleens of recipient miscarriage prone mice and significantly reduced resorption in those mice. CONCLUSION Epigenetic regulation of Foxp3 can generate functional regulatory T-cells. Adoptive transfer of TSA- induced CD4+CD25+Foxp3+ Treg at an early stage of pregnancy can induce maternal-fetal immune tolerance and reduce embryo resorption in miscarriage prone mice.
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Affiliation(s)
- Jian Wang
- Institute of Immunology of Shanxi Datong University, Datong, Shanxi, 037009, PR China.
| | - Jing Yang
- Department of Hematology, The Fifth People's Hospital of Datong, Shanxi, 037009, PR China
| | - Yuqing Yan
- Department of Biochemistry, Medical College of Shanxi Datong University, Datong, Shanxi, 037009, PR China
| | - Zhuangyan Zhu
- Institute of Immunology of Shanxi Datong University, Datong, Shanxi, 037009, PR China
| | - Yaqin Mu
- Institute of Immunology of Shanxi Datong University, Datong, Shanxi, 037009, PR China
| | - Xiying Wang
- Institute of Immunology of Shanxi Datong University, Datong, Shanxi, 037009, PR China
| | - Jinhua Zhang
- Department of Hematology, The Fifth People's Hospital of Datong, Shanxi, 037009, PR China
| | - Lihua Liu
- Institute of Immunology of Shanxi Datong University, Datong, Shanxi, 037009, PR China
| | - Fuxi Zhao
- Institute of Immunology of Shanxi Datong University, Datong, Shanxi, 037009, PR China
| | - Yuling Chi
- Department of Medicine, Albert Einstein College of Medicine, Bronx, NY, 10461, USA.
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90
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Nataraj NM, Dang AP, Kam LC, Lee JH. Ex vivo induction of regulatory T cells from conventional CD4 + T cells is sensitive to substrate rigidity. J Biomed Mater Res A 2018; 106:3001-3008. [PMID: 30303608 PMCID: PMC6240380 DOI: 10.1002/jbm.a.36489] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2018] [Revised: 05/16/2018] [Accepted: 06/11/2018] [Indexed: 12/26/2022]
Abstract
The immune system maintains a balance between protection and tolerance. Regulatory T cells (Tregs) function as a vital tolerance mechanism in the immune system to suppress effector immune cells. Additionally, Tregs can be utilized as a form of immunotherapy for autoimmune disorders. As T cells have previously been shown to exhibit sensitivity to the rigidity of an activating substrate upon activation via IL-2 secretion, we herein explore the previously unknown effect of substrate rigidity on the induction of Tregs from conventional naïve mouse CD4+ T cells. Substrates with modulatable rigidities ranging from a hundred kilopascals to a few megapascals were fabricated via poly(dimethylsiloxane). We found that there was a significant increase in Treg induction at lower substrate rigidities (i.e., E ~ 100 kPa) compared to higher rigidity levels (i.e., E ~ 3 MPa). To confirm that this significant difference in induction rate was truly related to T-cell mechanosensing, we administered compound Y-27632 to inhibit myosin contractility. In the presence of Y-27632, the myosin-based contractility was disrupted and, as a result, the difference in Treg induction caused by the substrate rigidity was abrogated. This study demonstrates that mechanosensing is involved in Treg induction and raises questions about the underlying molecular mechanisms involved in this process. © 2018 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 106A: 3001-3008, 2018.
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Affiliation(s)
- Neha M Nataraj
- Department of Biomedical Engineering, Columbia University, New York, New York
- Biomedical Graduate Studies, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania
| | - Alex P Dang
- Department of Biomedical Engineering, Columbia University, New York, New York
| | - Lance C Kam
- Department of Biomedical Engineering, Columbia University, New York, New York
| | - Jounghyun H Lee
- Department of Biomedical Engineering, Columbia University, New York, New York
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91
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92
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Taefehshokr N, Isazadeh A, Oveisi A, Key YA, Taefehshokr S. Reciprocal role of hBD2 and hBD3 on the adaptive immune response by measuring T lymphocyte proliferation in terms of CD4 and CCR6 expression. Horm Mol Biol Clin Investig 2018; 35:/j/hmbci.ahead-of-print/hmbci-2018-0023/hmbci-2018-0023.xml. [PMID: 30098283 DOI: 10.1515/hmbci-2018-0023] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Background Human β-defensins (hBD2 and hBD3) are small cationic antimicrobial peptides of innate immune system which can act as a barrier against the majority of pathogens, contributing to the host immune defence. Objective The aim of study is to determine whether hBD2 and hBD3 play a role in development and proliferation of human effector CD4 T cells or not. Furthermore, if enhanced proliferation is observed in the presence of hBD2 and hBD3, these data will demonstrate whether chemokine receptor type 6 (CCR6) is required to be present for this activity to occur. Methods In this study, we examined the effect of hBD2 and hBD3 on CD4+ T cell proliferation in CCR6+ and CCR6- T cells through co-culture of peripheral blood mononuclear cells with anti-CD3 and anti-CD28 stimulation in the presence or absence of hBD2 and hBD3. Proliferation was assessed using flow cytometry. Results It was demonstrated that, co-culture with hBD2 and hBD3 led to up-regulation of CD4+ T cell proliferation after 72 h whereas, CD4+ T cell proliferation was suppressed after 96 h. On the other hand, CCR6- and CCR6+ T cell proliferation was up-regulated after 72 h. But, CCR6+ only was down-regulated in the second cycle in the presence of hBD3. In contrast, after 96 h CCR6+ and CCR6- T cell proliferation was decreased. Conclusion Collectively, our data indicated that hBD2 and hBD3 play a positive and negative regulatory role in development and proliferation of human effector CD4+ T cells which is essential for optimal adaptive immune responses and the control of immunopathology.
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Affiliation(s)
- Nima Taefehshokr
- Division of Biosciences, Department of Life Sciences, College of Health and Life Sciences, Brunel University London, Uxbridge, Middlesex UB8 3PH, UK, Phone/Fax: 0044-7944658893
| | - Alireza Isazadeh
- Department of Genetics, Islamic Azad University, Tabriz Branch, Tabriz, Iran
| | - Amin Oveisi
- Faculty of Veterinary Medicine, Islamic Azad University, Tabriz Branch, Tabriz, Iran
| | - Yashar Azari Key
- Young Researchers and Elite Club, Islamic Azad University, Tabriz Branch, Tabriz, Iran
| | - Sina Taefehshokr
- Faculty of Veterinary Medicine, Islamic Azad University, Tabriz Branch, Tabriz, Iran.,Young Researchers and Elite Club, Islamic Azad University, Tabriz Branch, Tabriz, Iran
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93
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Cho S, Lee HM, Yu IS, Choi YS, Huang HY, Hashemifar SS, Lin LL, Chen MC, Afanasiev ND, Khan AA, Lin SW, Rudensky AY, Crotty S, Lu LF. Differential cell-intrinsic regulations of germinal center B and T cells by miR-146a and miR-146b. Nat Commun 2018; 9:2757. [PMID: 30013024 PMCID: PMC6048122 DOI: 10.1038/s41467-018-05196-3] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Accepted: 06/22/2018] [Indexed: 11/24/2022] Open
Abstract
Reciprocal interactions between B and follicular T helper (Tfh) cells orchestrate the germinal center (GC) reaction, a hallmark of humoral immunity. Abnormal GC responses could lead to the production of pathogenic autoantibodies and the development of autoimmunity. Here we show that miR-146a controls GC responses by targeting multiple CD40 signaling pathway components in B cells; by contrast, loss of miR-146a in T cells does not alter humoral responses. However, specific deletion of both miR-146a and its paralog, miR-146b, in T cells increases Tfh cell numbers and enhanced GC reactions. Thus, our data reveal differential cell-intrinsic regulations of GC B and Tfh cells by miR-146a and miR-146b. Together, members of the miR-146 family serve as crucial molecular brakes to coordinately control GC reactions to generate protective humoral responses without eliciting unwanted autoimmunity. In the germinal center (GC), B and T cells interact to induce the production of protective antibodies against threats. Here the authors show that microRNA miR-146a modulates CD40 signaling in GC B cells, while both miR-146a and miR-146b synergize to control GC T cell responses, thereby implicating intricate controls of GC response by miR-146.
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Affiliation(s)
- Sunglim Cho
- Division of Biological Sciences, University of California, La Jolla, San Diego, CA, 92093, USA
| | - Hyang-Mi Lee
- Division of Biological Sciences, University of California, La Jolla, San Diego, CA, 92093, USA
| | - I-Shing Yu
- Laboratory Animal Center, College of Medicine, National Taiwan University, Taipei, 100, Taiwan
| | - Youn Soo Choi
- Division of Vaccine Discovery, La Jolla Institute for Allergy and Immunology, La Jolla, CA, 92037, USA.,Department of Medicine, College of Medicine, Seoul National University, Seoul, 03080, Korea
| | - Hsi-Yuan Huang
- Department of Laboratory Medicine, China Medical University Hospital, China Medical University, Taichung, Taiwan
| | | | - Ling-Li Lin
- Division of Biological Sciences, University of California, La Jolla, San Diego, CA, 92093, USA
| | - Mei-Chi Chen
- Division of Biological Sciences, University of California, La Jolla, San Diego, CA, 92093, USA
| | - Nikita D Afanasiev
- Division of Biological Sciences, University of California, La Jolla, San Diego, CA, 92093, USA
| | | | - Shu-Wha Lin
- Department of Clinical Laboratory Sciences and Medical Biotechnology, College of Medicine, National Taiwan University, Taipei, 100, Taiwan.,Department of Laboratory Medicine, National Taiwan University Hospital, Taipei, 100, Taiwan
| | - Alexander Y Rudensky
- Howard Hughes Medical Institute and Immunology Program, Ludwig Center at Memorial Sloan-Kettering Cancer Center, Memorial Sloan-Kettering Cancer Center, New York, NY, 10065, USA
| | - Shane Crotty
- Division of Vaccine Discovery, La Jolla Institute for Allergy and Immunology, La Jolla, CA, 92037, USA.,Division of Infectious Diseases, Department of Medicine, University of California, La Jolla, San Diego, CA, 92037, USA
| | - Li-Fan Lu
- Division of Biological Sciences, University of California, La Jolla, San Diego, CA, 92093, USA. .,Moores Cancer Center, University of California, La Jolla, San Diego, CA, 92093, USA. .,Center for Microbiome Innovation, University of California, La Jolla, San Diego, CA, 92093, USA.
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Cao T, Zhang X, Chen D, Zhang P, Li Q, Muhammad A. The epigenetic modification during the induction of Foxp3 with sodium butyrate. Immunopharmacol Immunotoxicol 2018; 40:309-318. [DOI: 10.1080/08923973.2018.1480631] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Tengli Cao
- School of Basic Medicine and Clinical Pharmacy, China Pharmaceutical University, Nanjing, China
| | - Xiuxiu Zhang
- School of Basic Medicine and Clinical Pharmacy, China Pharmaceutical University, Nanjing, China
| | - Dingding Chen
- School of Basic Medicine and Clinical Pharmacy, China Pharmaceutical University, Nanjing, China
| | - Peiyan Zhang
- School of Basic Medicine and Clinical Pharmacy, China Pharmaceutical University, Nanjing, China
| | - Qing Li
- School of Basic Medicine and Clinical Pharmacy, China Pharmaceutical University, Nanjing, China
| | - Abbas Muhammad
- School of Basic Medicine and Clinical Pharmacy, China Pharmaceutical University, Nanjing, China
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95
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Golumba-Nagy V, Kuehle J, Hombach AA, Abken H. CD28-ζ CAR T Cells Resist TGF-β Repression through IL-2 Signaling, Which Can Be Mimicked by an Engineered IL-7 Autocrine Loop. Mol Ther 2018; 26:2218-2230. [PMID: 30055872 DOI: 10.1016/j.ymthe.2018.07.005] [Citation(s) in RCA: 60] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2018] [Revised: 06/28/2018] [Accepted: 07/03/2018] [Indexed: 01/09/2023] Open
Abstract
Adoptive cell therapy with chimeric antigen receptor (CAR)-redirected T cells induced spectacular regressions of leukemia and lymphoma, however, failed so far in the treatment of solid tumors. A cause is thought to be T cell repression through TGF-β, which is massively accumulating in the tumor tissue. Here, we show that T cells with a CD28-ζ CAR, but not with a 4-1BB-ζ CAR, resist TGF-β-mediated repression. Mechanistically, LCK activation and consequently IL-2 release and autocrine IL-2 receptor signaling mediated TGF-β resistance; deleting the LCK-binding motif in the CD28 CAR abolished both IL-2 secretion and TGF-β resistance, while IL-2 add-back restored TGF-β resistance. Other γ-cytokines like IL-7 and IL-15 could replace IL-2 in this context. This is demonstrated by engineering IL-2 deficient CD28ΔLCK-ζ CAR T cells with a hybrid IL-7 receptor to provide IL-2R β chain signaling upon IL-7 binding. Such modified T cells showed improved CAR T cell activity against TGF-β+ tumors. Data draw the concept that an autocrine loop resulting in IL-2R signaling can make CAR T cells more potent in staying active against TGF-β+ solid tumors.
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Affiliation(s)
- Viktória Golumba-Nagy
- Center for Molecular Medicine Cologne, University of Cologne, Cologne, Germany; Department I Internal Medicine, University Hospital Cologne, Cologne, Germany
| | - Johannes Kuehle
- Center for Molecular Medicine Cologne, University of Cologne, Cologne, Germany; Department I Internal Medicine, University Hospital Cologne, Cologne, Germany
| | - Andreas A Hombach
- Center for Molecular Medicine Cologne, University of Cologne, Cologne, Germany; Department I Internal Medicine, University Hospital Cologne, Cologne, Germany
| | - Hinrich Abken
- Center for Molecular Medicine Cologne, University of Cologne, Cologne, Germany; Department I Internal Medicine, University Hospital Cologne, Cologne, Germany; Regensburg Center for Interventional Immunology (RCI), University Regensburg, Regensburg, Germany; University Medical Center of Regensburg, Regensburg, Germany.
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Bending D, Paduraru A, Ducker CB, Prieto Martín P, Crompton T, Ono M. A temporally dynamic Foxp3 autoregulatory transcriptional circuit controls the effector Treg programme. EMBO J 2018; 37:embj.201899013. [PMID: 29991564 PMCID: PMC6092677 DOI: 10.15252/embj.201899013] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2018] [Revised: 05/15/2018] [Accepted: 06/12/2018] [Indexed: 11/24/2022] Open
Abstract
Regulatory T cells (Treg) are negative regulators of the immune response; however, it is poorly understood whether and how Foxp3 transcription is induced and regulated in the periphery during T‐cell responses. Using Foxp3‐Timer of cell kinetics and activity (Tocky) mice, which report real‐time Foxp3 expression, we show that the flux of new Foxp3 expressors and the rate of Foxp3 transcription are increased during inflammation. These persistent dynamics of Foxp3 transcription determine the effector Treg programme and are dependent on a Foxp3 autoregulatory transcriptional circuit. Persistent Foxp3 transcriptional activity controls the expression of coinhibitory molecules, including CTLA‐4 and effector Treg signature genes. Using RNA‐seq, we identify two groups of surface proteins based on their relationship to the temporal dynamics of Foxp3 transcription, and we show proof of principle for the manipulation of Foxp3 dynamics by immunotherapy: new Foxp3 flux is promoted by anti‐TNFRII antibody, and high‐frequency Foxp3 expressors are targeted by anti‐OX40 antibody. Collectively, our study dissects time‐dependent mechanisms behind Foxp3‐driven T‐cell regulation and establishes the Foxp3‐Tocky system as a tool to investigate the mechanisms behind T‐cell immunotherapies.
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Affiliation(s)
- David Bending
- Department of Life Sciences, Faculty of Natural Sciences, Imperial College London, London, UK
| | - Alina Paduraru
- Department of Life Sciences, Faculty of Natural Sciences, Imperial College London, London, UK
| | - Catherine B Ducker
- Department of Life Sciences, Faculty of Natural Sciences, Imperial College London, London, UK
| | - Paz Prieto Martín
- Department of Life Sciences, Faculty of Natural Sciences, Imperial College London, London, UK
| | - Tessa Crompton
- UCL Great Ormond Street Institute of Child Health, London, UK
| | - Masahiro Ono
- Department of Life Sciences, Faculty of Natural Sciences, Imperial College London, London, UK
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97
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CTLA4Ig Improves Murine iTreg Induction via TGF β and Suppressor Function In Vitro. J Immunol Res 2018; 2018:2484825. [PMID: 30057914 PMCID: PMC6051081 DOI: 10.1155/2018/2484825] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2018] [Revised: 04/26/2018] [Accepted: 05/29/2018] [Indexed: 12/30/2022] Open
Abstract
Blockade of the CD28:CD80/86 costimulatory pathway has been shown to be potent in blocking T cell activation in vitro and in vivo. The costimulation blocker CTLA4Ig has been approved for the treatment of autoimmune diseases and transplant rejection. The therapeutic application of regulatory T cells (Tregs) has recently gained much attention for its potential of improving allograft survival. However, neither costimulation blockade with CTLA4Ig nor Treg therapy induces robust tolerance on its own. Combining CTLA4Ig with Treg therapy would be an attractive approach for minimizing immunosuppression or for possibly achieving tolerance. However, since the CD28 pathway is more complex than initially thought, the question arose whether blocking CD80/86 would inadvertently impact immunological tolerance by interfering with Treg generation and function. We therefore wanted to investigate the compatibility of CTLA4Ig with regulatory T cells by evaluating direct effects of CTLA4Ig on murine Treg generation and function in vitro. For generation of polyclonal-induced Tregs, we utilized an APC-free in vitro system and added titrated doses of CTLA4Ig at different time points. Phenotypical characterization by flow cytometry and functional characterization in suppressor assays did not reveal negative effects by CTLA4Ig. The costimulation blocker CTLA4Ig does not impair but rather improves murine iTreg generation and suppressor function in vitro.
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98
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Xie MM, Dent AL. Unexpected Help: Follicular Regulatory T Cells in the Germinal Center. Front Immunol 2018; 9:1536. [PMID: 30013575 PMCID: PMC6036241 DOI: 10.3389/fimmu.2018.01536] [Citation(s) in RCA: 52] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Accepted: 06/21/2018] [Indexed: 01/22/2023] Open
Abstract
Follicular helper T (Tfh) cells are necessary for germinal center (GC) formation and within the GC, provide key signals to B cells for their differentiation into plasmablasts and plasma cells that secrete high-affinity and isotype-switched antibody (Ab). A specialized subset of Foxp3+ T cells termed T follicular regulatory (Tfr) cells, also regulate the differentiation of Ab-secreting cells from the GC. Tfr-cell function in the GC is not well understood, however, the dominant paradigm currently is that Tfr cells repress excessive Tfh and GC B cell proliferation and help promote stringent selection of high-affinity B cells. A mouse model where the Bcl6 gene is specifically deleted in Foxp3+ T cells (Bcl6FC mice) allows the study of Tfr cell function with more precision than other approaches. Studies with this model have shown that Tfr cells play a key role in maintaining GC B cell proliferation and Ab levels. Part of the mechanism for this positive "helper" effect of Tfr cells on the GC is Tfr cell-derived IL-10, which can promote B cell growth and entry into the dark zone of the GC. Recent studies on Tfr cells support a new paradigm for Tfr cell function in the GC reaction. Here, we review studies on Tfr cell functions and discuss the evidence that Tfr cells can have a major helper role in the GC-dependent Ab response.
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Affiliation(s)
- Markus M Xie
- Department of Microbiology and Immunology, Indiana University School of Medicine, Indianapolis, IN, United States
| | - Alexander L Dent
- Department of Microbiology and Immunology, Indiana University School of Medicine, Indianapolis, IN, United States
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Schwarz C, Mahr B, Muckenhuber M, Wekerle T. Belatacept/CTLA4Ig: an update and critical appraisal of preclinical and clinical results. Expert Rev Clin Immunol 2018; 14:583-592. [PMID: 29874474 DOI: 10.1080/1744666x.2018.1485489] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
INTRODUCTION The B7/CD28/CTLA4 signaling cascade is the most thoroughly studied costimulatory pathway and blockade with CTLA4Ig (abatacept) or its derivative belatacept has emerged as a valuable option for pharmacologic immune modulation. Several clinical studies have ultimately led to the approval of belatacept for immunosuppression in kidney transplant recipients. Areas covered: This review will discuss the immunological background of costimulation blockade and recent preclinical data and clinical results of CTLA4Ig/belatacept. Expert commentary: The development of belatacept is a major advance in clinical transplantation. However, in spite of promising results in preclinical and clinical trials, clinical use remains limited at present, in part due to increased rates of acute rejection. Recent efforts showing encouraging progress in refining such protocols might be a step toward harnessing the full potential of costimulation blockade-based immunosuppression.
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Affiliation(s)
- Christoph Schwarz
- a Division of General Surgery, Department of Surgery , Medical University of Vienna , Vienna , Austria.,b Section of Transplantation Immunology, Department of Surgery , Medical University of Vienna , Vienna , Austria
| | - Benedikt Mahr
- b Section of Transplantation Immunology, Department of Surgery , Medical University of Vienna , Vienna , Austria
| | - Moritz Muckenhuber
- b Section of Transplantation Immunology, Department of Surgery , Medical University of Vienna , Vienna , Austria
| | - Thomas Wekerle
- b Section of Transplantation Immunology, Department of Surgery , Medical University of Vienna , Vienna , Austria
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100
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Wakamatsu E, Omori H, Ohtsuka S, Ogawa S, Green JM, Abe R. Regulatory T cell subsets are differentially dependent on CD28 for their proliferation. Mol Immunol 2018; 101:92-101. [PMID: 29909367 DOI: 10.1016/j.molimm.2018.05.021] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2018] [Revised: 05/21/2018] [Accepted: 05/24/2018] [Indexed: 01/08/2023]
Abstract
It is thought that CD28 plays a crucial role in the maintenance of regulatory T cell (Treg) pool size through promoting the development and proliferation of these cells. However, recently we found that the dependency on CD28 co-stimulation for their development is different between Treg subsets, thymus-derived Tregs (tTregs, CD28-dependent) and peripherally-derived Tregs (pTregs, CD28-independent), suggesting that CD28 may also have differential influences on the homeostasis of each Treg subset. Here, we demonstrated that both Treg subsets were reduced in secondary lymphoid organs of CD28 deficient mice, and that this reduction was due to impaired proliferation in both Treg subsets by the intrinsic CD28 defect. However, we found that the massive proliferation of both Treg subsets under lymphopenic condition was regulated by CD28, whereas the proliferative activity of tTregs but not pTregs in the steady state was dependent on CD28. Also, experiments using mutant CD28 knock-in mice revealed that proliferation of pTregs under lymphopenic condition required only the Lck-NFκB pathway of CD28, whereas tTregs required an additional unknown pathway. These findings indicate that the dependency on CD28 for proliferation in each Treg subset differs depending on the environment.
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Affiliation(s)
- Ei Wakamatsu
- Division of Immunobiology, Research Institute for Biomedical Sciences, Tokyo University of Science, 2669 Yamazaki, Noda City, Chiba, 278-0022, Japan; Department of Immunology, Tokyo Medical University, 6-1-1 Shinjuku, Shinjuku-ku, Tokyo 160-8402, Japan
| | - Hiroki Omori
- Division of Immunobiology, Research Institute for Biomedical Sciences, Tokyo University of Science, 2669 Yamazaki, Noda City, Chiba, 278-0022, Japan
| | - Shizuka Ohtsuka
- Division of Immunobiology, Research Institute for Biomedical Sciences, Tokyo University of Science, 2669 Yamazaki, Noda City, Chiba, 278-0022, Japan
| | - Shuhei Ogawa
- Division of Experimental Animal Immunology, Research Institute for Biomedical Sciences, Tokyo University of Science, 2669 Yamazaki, Noda City, Chiba, 278-0022, Japan
| | - Jonathan M Green
- Department of Internal Medicine, Washington University School of Medicine, St Louis, MO 63110, United States
| | - Ryo Abe
- Division of Immunobiology, Research Institute for Biomedical Sciences, Tokyo University of Science, 2669 Yamazaki, Noda City, Chiba, 278-0022, Japan.
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