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Park JH, Kang I, Lee HK. γδ T Cells in Brain Homeostasis and Diseases. Front Immunol 2022; 13:886397. [PMID: 35693762 PMCID: PMC9181321 DOI: 10.3389/fimmu.2022.886397] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Accepted: 04/25/2022] [Indexed: 11/30/2022] Open
Abstract
γδ T cells are a distinct subset of T cells expressing γδ T cell receptor (TCR) rather than αβTCR. Since their discovery, the critical roles of γδ T cells in multiple physiological systems and diseases have been investigated. γδ T cells are preferentially located at mucosal surfaces, such as the gut, although a small subset of γδ T cells can circulate the blood. Additionally, a subset of γδ T cells reside in the meninges in the central nervous system. Recent findings suggest γδ T cells in the meninges have critical roles in brain function and homeostasis. In addition, several lines of evidence have shown γδ T cells can infiltrate the brain parenchyma and regulate inflammatory responses in multiple diseases, including neurodegenerative diseases. Although the importance of γδ T cells in the brain is well established, their roles are still incompletely understood due to the complexity of their biology. Because γδ T cells rapidly respond to changes in brain status and regulate disease progression, understanding the role of γδ T cells in the brain will provide critical information that is essential for interpreting neuroimmune modulation. In this review, we summarize the complex role of γδ T cells in the brain and discuss future directions for research.
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2
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Shao H, Kaplan HJ, Sun D. Bidirectional Effect of IFN-γ on Th17 Responses in Experimental Autoimmune Uveitis. FRONTIERS IN OPHTHALMOLOGY 2022; 2:831084. [PMID: 36188211 PMCID: PMC9521044 DOI: 10.3389/fopht.2022.831084] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Pro- and ant-inflammatory effects of IFN-γ have been repeatedly found in various immune responses, including cancer and autoimmune diseases. In a previous study we showed that the timing of treatment determines the effect of adenosine-based immunotherapy. In this study we examined the role of IFN-γ in pathogenic Th17 responses in experimental autoimmune uveitis (EAU). We observed that IFN-γ has a bidirectional effect on Th17 responses, when tested both in vitro and in vivo. Anti-IFN-γ antibody inhibits Th17 responses when applied in the initial phase of the immune response; however, it enhances the Th17 response if administered in a later phase of EAU. In the current study we showed that IFN-γ is an important immunomodulatory molecule in γδ T cell activation, as well as in Th17 responses. These results should advance our understanding of the regulation of Th17 responses in autoimmunity.
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Affiliation(s)
- Hui Shao
- Department of Ophthalmology and Visual Sciences, Kentucky Lions Eye Center, University of Louisville, Louisville, KY, United States
| | - Henry J. Kaplan
- Department of Ophthalmology, Saint Louis University School of Medicine, Saint Louis, MO, United States
| | - Deming Sun
- Doheny Eye Institute and Department of Ophthalmology, David Geffen School of Medicine at University of California, Los Angeles, Los Angeles, CA, United States
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3
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Pinke KH, Zorzella-Pezavento SFG, Lara VS, Sartori A. Should mast cells be considered therapeutic targets in multiple sclerosis? Neural Regen Res 2020; 15:1995-2007. [PMID: 32394947 PMCID: PMC7716037 DOI: 10.4103/1673-5374.282238] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Revised: 12/19/2019] [Accepted: 01/16/2020] [Indexed: 12/23/2022] Open
Abstract
Mast cells are immune cells of the myeloid lineage that are found throughout the body, including the central nervous system. They perform many functions associated with innate and specific immunity, angiogenesis, and vascular homeostasis. Moreover, they have been implicated in a series of pathologies (e.g., hypersensitivity reactions, tumors, and inflammatory disorders). In this review, we propose that this cell could be a relevant therapeutic target in multiple sclerosis, which is a central nervous system degenerative disease. To support this proposition, we describe the general biological properties of mast cells, their contribution to innate and specific immunity, and the participation of mast cells in the various stages of multiple sclerosis and experimental autoimmune encephalomyelitis development. The final part of this review is dedicated to an overview of the available mast cells immunomodulatory drugs and their activity on multiple sclerosis and experimental autoimmune encephalomyelitis, including our own experience related to the effect of ketotifen fumarate on experimental autoimmune encephalomyelitis evolution.
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Affiliation(s)
- Karen Henriette Pinke
- Institute of Biosciences, Department of Microbiology and Immunology, São Paulo State University (UNESP), Botucatu, São Paulo, Brazil
| | | | - Vanessa Soares Lara
- Bauru School of Dentistry, Department of Surgery, Stomatology, Pathology and Radiology, University of São Paulo, Bauru, São Paulo, Brazil
| | - Alexandrina Sartori
- Institute of Biosciences, Department of Microbiology and Immunology, São Paulo State University (UNESP), Botucatu, São Paulo, Brazil
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4
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β2 Integrins differentially regulate γδ T cell subset thymic development and peripheral maintenance. Proc Natl Acad Sci U S A 2020; 117:22367-22377. [PMID: 32848068 DOI: 10.1073/pnas.1921930117] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The γδ T cells reside predominantly at barrier sites and play essential roles in immune protection against infection and cancer. Despite recent advances in the development of γδ T cell immunotherapy, our understanding of the basic biology of these cells, including how their numbers are regulated in vivo, remains poor. This is particularly true for tissue-resident γδ T cells. We have identified the β2 family of integrins as regulators of γδ T cells. β2-integrin-deficient mice displayed a striking increase in numbers of IL-17-producing Vγ6Vδ1+ γδ T cells in the lungs, uterus, and circulation. Thymic development of this population was normal. However, single-cell RNA sequencing revealed the enrichment of genes associated with T cell survival and proliferation specifically in β2-integrin-deficient IL-17+ cells compared to their wild-type counterparts. Indeed, β2-integrin-deficient Vγ6+ cells from the lungs showed reduced apoptosis ex vivo, suggesting that increased survival contributes to the accumulation of these cells in β2-integrin-deficient tissues. Furthermore, our data revealed an unexpected role for β2 integrins in promoting the thymic development of the IFNγ-producing CD27+ Vγ4+ γδ T cell subset. Together, our data reveal that β2 integrins are important regulators of γδ T cell homeostasis, inhibiting the survival of IL-17-producing Vγ6Vδ1+ cells and promoting the thymic development of the IFNγ-producing Vγ4+ subset. Our study introduces unprecedented mechanisms of control for γδ T cell subsets.
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5
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Chang L, Wang L, Ling N, Peng H, Chen M. Increase in liver γδ T cells with concurrent augmentation of IFN-β production during the early stages of a mouse model of acute experimental hepatitis B virus infection. Exp Ther Med 2019; 19:67-78. [PMID: 31853274 PMCID: PMC6909674 DOI: 10.3892/etm.2019.8197] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2018] [Accepted: 09/27/2019] [Indexed: 12/17/2022] Open
Abstract
The role of γδ T cells in acute hepatitis B virus (HBV) infection remains unclear. For the present study, a mouse model of acute HBV infection was constructed using hydrodynamic injection-based transfection of an HBV DNA plasmid (pHBV). Subsequent changes in the percentages of γδ T cells, expression of activation molecules (CD25 and CD69) and the production of the inflammatory cytokines interferon (IFN)-γ and tumor necrosis factor-α (TNF-α) by liver γδ T cells were investigated using fluorescence-activated cell sorting (FACS). Additionally, the immune responses in the mouse liver were evaluated dynamically by measuring cytokine mRNA expression (IFN-α, IFN-β, IFN-γ or TNF-α) using reverse transcription-quantitative PCR, and other populations of immune cells, including CD4+T, CD8+T, natural killer (NK) or natural killer T (NKT) cells, using FACS. On day 1 following acute HBV infection, the percentage of liver γδ T cells was significantly increased along with the high expression of HBV markers. Additionally, liver γδ T cells displayed peak expression of the activation marker CD69 and peak IFN-γ production within this timeframe. IFN-β mRNA expression and the percentage of NK cells were elevated significantly on day 1 in liver tissues. However, there were no significant changes in the spleen or peripheral γδ T cells. Therefore, these data suggested that during the early stages of acute HBV infection, significantly increased numbers of liver γδ T cells may be involved in the enhanced immune response to the increased expression of HBV markers in the liver.
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Affiliation(s)
- Lin Chang
- Department of Clinical Laboratory, People's Hospital of Bishan District, Chongqing 402760, P.R. China
| | - Lei Wang
- Department of Clinical Laboratory, Taihe Hospital, Hubei University of Medicine, Shiyan, Hubei 442000, P.R. China
| | - Ning Ling
- Key Laboratory of Molecular Biology for Infectious Diseases (Ministry of Education), Institute for Viral Hepatitis, The Second Affiliated Hospital, Chongqing Medical University, Chongqing 400016, P.R. China
| | - Hui Peng
- Department of Clinical Laboratory, The Second Affiliated Hospital, Chongqing Medical University, Chongqing 400010, P.R. China
| | - Min Chen
- Key Laboratory of Molecular Biology for Infectious Diseases (Ministry of Education), Institute for Viral Hepatitis, The Second Affiliated Hospital, Chongqing Medical University, Chongqing 400016, P.R. China
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6
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Okeke EB, Uzonna JE. The Pivotal Role of Regulatory T Cells in the Regulation of Innate Immune Cells. Front Immunol 2019; 10:680. [PMID: 31024539 PMCID: PMC6465517 DOI: 10.3389/fimmu.2019.00680] [Citation(s) in RCA: 144] [Impact Index Per Article: 28.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Accepted: 03/12/2019] [Indexed: 12/11/2022] Open
Abstract
The distinction between innate and adaptive immunity is one of the basic tenets of immunology. The co-operation between these two arms of the immune system is a major determinant of the resistance or susceptibility of the host following pathogen invasion. Hence, this interactive co-operation between cells of the innate and adaptive immunity is of significant interest to immunologists. The sub-population of CD4+ T cells with regulatory phenotype (regulatory T cells; Tregs), which constitute a part of the adaptive immune system, have been widely implicated in the regulation of the immune system and maintenance of immune homeostasis. In the last two decades, there has been an explosion in research describing the role of Tregs and their relevance in several immunopathologies ranging from inflammation to cancer. The majority of these studies focus on the role of Tregs on the cells of the adaptive immune system. Recently, there is significant interest in the role of Tregs on cells of the innate immune system. In this review, we examine the literature on the role of Tregs in immunology. Specifically, we focus on the emerging knowledge of Treg interaction with dendritic cells, macrophages, neutrophils, and γδ T cells. We highlight this interaction as an important link between innate and adaptive immune systems which also indicate the far-reaching role of Tregs in the regulation of immune responses and maintenance of self-tolerance and immune homeostasis.
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Affiliation(s)
- Emeka B Okeke
- Department of Pharmaceutical Sciences, University of Michigan, Ann Arbor, MI, United States
| | - Jude E Uzonna
- Department of Immunology, Faculty of Medicine, University of Manitoba, Winnipeg, MB, Canada
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7
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Zarobkiewicz MK, Kowalska W, Roliński J, Bojarska-Junak AA. γδ T lymphocytes in the pathogenesis of multiple sclerosis and experimental autoimmune encephalomyelitis. J Neuroimmunol 2019; 330:67-73. [PMID: 30831520 DOI: 10.1016/j.jneuroim.2019.02.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2018] [Revised: 02/07/2019] [Accepted: 02/17/2019] [Indexed: 12/18/2022]
Abstract
The aim of the current review is to summarize the results of studies on the role of γδ T cells in the pathogenesis of multiple sclerosis and its animal model - the experimental autoimmune encephalomyelitis. Despite the fact that numerous studies have been performed, the role of γδ T is still not fully understood. It seems that there are two distinct subpopulations - one exacerbating the disease (IL-17-producing) and the other playing a protective role (IFN-γ-secreting). Nevertheless, future studies are required for an understanding of γδ T cells role in multiple sclerosis.
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Affiliation(s)
| | - Wioleta Kowalska
- Chair and Department of Clinical Immunology, Medical University of Lublin, Poland
| | - Jacek Roliński
- Chair and Department of Clinical Immunology, Medical University of Lublin, Poland
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8
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Shiromizu CM, Jancic CC. γδ T Lymphocytes: An Effector Cell in Autoimmunity and Infection. Front Immunol 2018; 9:2389. [PMID: 30386339 PMCID: PMC6198062 DOI: 10.3389/fimmu.2018.02389] [Citation(s) in RCA: 67] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2018] [Accepted: 09/26/2018] [Indexed: 12/12/2022] Open
Abstract
γδ T cells are non-conventional lymphocytes which show several properties of innate immune cells. They present a limited TCR repertoire and circulate as cells with a pre-activated phenotype thus being able to generate rapid immune responses. γδ T cells do not recognize classical peptide antigens, their TCRs are non-MHC restricted and they can respond to pathogen-associated molecular patterns and to cytokines in absence of TCR ligands. They also recognize self-molecules induced by stress, which indicate infection and cellular transformation. All these features let γδ T cells act as a first line of defense in sterile and non-sterile inflammation. γδ T cells represent 1–10% of circulating lymphocytes in the adult human peripheral blood, they are widely localized in non-lymphoid tissues and constitute the majority of immune cells in some epithelial surfaces, where they participate in the maintenance of the epithelial barriers. γδ T cells produce a wide range of cytokines that orchestrate the course of immune responses and also exert high cytotoxic activity against infected and transformed cells. In contrast to their beneficial role during infection, γδ T cells are also implicated in the development and progression of autoimmune diseases. Interestingly, several functions of γδ T cells are susceptible to modulation by interaction with other cells. In this review, we give an overview of the γδ T cell participation in infection and autoimmunity. We also revise the underlying mechanisms that modulate γδ T cell function that might provide tools to control pathological immune responses.
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Affiliation(s)
- Carolina Maiumi Shiromizu
- Laboratorio de Inmunidad Innata, Instituto de Medicina Experimental (IMEX) - CONICET, Academia Nacional de Medicina, Buenos Aires, Argentina
| | - Carolina Cristina Jancic
- Laboratorio de Inmunidad Innata, Instituto de Medicina Experimental (IMEX) - CONICET, Academia Nacional de Medicina, Buenos Aires, Argentina.,Departamento de Microbiología, Parasitología e Inmunología, Facultad de Medicina, Universidad de Buenos Aires, Buenos Aires, Argentina
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9
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McKenzie DR, Comerford I, Silva-Santos B, McColl SR. The Emerging Complexity of γδT17 Cells. Front Immunol 2018; 9:796. [PMID: 29731754 PMCID: PMC5919943 DOI: 10.3389/fimmu.2018.00796] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2018] [Accepted: 04/03/2018] [Indexed: 12/23/2022] Open
Abstract
Preprogrammed IL-17-producing γδ T cells constitute a poorly understood class of lymphocytes that express rearranged antigen receptors but appear to make little use of them. γδT17 cells were first characterized as tissue-resident sentinels with innate effector function. However, ongoing research continues to reveal unexpected complexity to this unusual subset, including phenotypic plasticity, memory-like activity and unique migratory behavior. Despite these advances, at the core of γδT17 cell biology remain fundamental gaps in knowledge: Are γδT17 cells truly innate or has the importance of the T cell receptor been overlooked? How unique are they among IL-17-producing lymphocytes? How similar are these cells between mice and humans? We speculate that answering these unresolved questions is key to successful manipulation of γδ T cells in clinical settings.
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Affiliation(s)
- Duncan R McKenzie
- Department of Molecular & Cellular Biology, University of Adelaide, Adelaide, SA, Australia
| | - Iain Comerford
- Department of Molecular & Cellular Biology, University of Adelaide, Adelaide, SA, Australia
| | - Bruno Silva-Santos
- Faculdade de Medicina, Instituto de Medicina Molecular, Universidade de Lisboa, Lisboa, Portugal
| | - Shaun R McColl
- Department of Molecular & Cellular Biology, University of Adelaide, Adelaide, SA, Australia
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10
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Siegers GM. Integral Roles for Integrins in γδ T Cell Function. Front Immunol 2018; 9:521. [PMID: 29593745 PMCID: PMC5859029 DOI: 10.3389/fimmu.2018.00521] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2018] [Accepted: 02/28/2018] [Indexed: 02/01/2023] Open
Abstract
Integrins are adhesion receptors on the cell surface that enable cells to respond to their environment. Most integrins are heterodimers, comprising α and β type I transmembrane glycoprotein chains with large extracellular domains and short cytoplasmic tails. Integrins deliver signals through multiprotein complexes at the cell surface, which interact with cytoskeletal and signaling proteins to influence gene expression, cell proliferation, morphology, and migration. Integrin expression on γδ T cells (γδTc) has not been systematically investigated; however, reports in the literature dating back to the early 1990s reveal an understated role for integrins in γδTc function. Over the years, integrins have been investigated on resting and/or activated peripheral blood-derived polyclonal γδTc, γδTc clones, as well as γδ T intraepithelial lymphocytes. Differences in integrin expression have been found between αβ T cells (αβTc) and γδTc, as well as between Vδ1 and Vδ2 γδTc. While most studies have focused on human γδTc, research has also been carried out in mouse and bovine models. Roles attributed to γδTc integrins include adhesion, signaling, activation, migration, tissue localization, tissue retention, cell spreading, cytokine secretion, tumor infiltration, and involvement in tumor cell killing. This review attempts to encompass all reports of integrins expressed on γδTc published prior to December 2017, highlights areas warranting further investigation, and discusses the relevance of integrin expression for γδTc function.
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11
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McGinley AM, Edwards SC, Raverdeau M, Mills KHG. Th17 cells, γδ T cells and their interplay in EAE and multiple sclerosis. J Autoimmun 2018; 87:S0896-8411(18)30007-6. [PMID: 29395738 DOI: 10.1016/j.jaut.2018.01.001] [Citation(s) in RCA: 74] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2018] [Accepted: 01/04/2018] [Indexed: 01/09/2023]
Abstract
Experimental autoimmune encephalomyelitis (EAE) is an animal model of multiple sclerosis (MS) that shares many features with the human disease. This review will focus on the role of IL-17-secreting CD4 and γδ T cells in EAE and MS, the plasticity of Th17 cells in vivo and the application of these findings to the understating of the pathogenesis and the development of new treatments for MS. There is convincing evidence that IL-17-secreting CD4 T cells (Th17 cells) and IL-17-secreting γδ T cells play a critical pathogenic role in central nervous system (CNS) inflammation in EAE and MS. Indeed a significant number of the major discoveries on the pathogenic role of IL-17-secreting T cells in autoimmunity were made in the EAE model. These included the first demonstration that IL-23-activated IL-17-secreting T cells are the key T cells in driving autoimmune disease pathology. Although the early studies on IL-17 focused on Th17 cells, it was later demonstrated that γδ T cells were an important early source of IL-17 and IL-21 that helped amplify IL-17 production by Th17 cells in autoimmune diseases. Furthermore, it emerged that Th1 cells can also have encephalitogenic activity and that there was considerable plasticity in these T cell responses, with Th17 cells reverting to a Th1 phenotype in vivo. This questioned the pathogenic role of IL-17 and suggested that other cytokines, such as IFN-γ, GM-CSF and TNF, may be important. Nevertheless, biological drugs that target the IL-23-IL-17 pathway are highly effective in treating human psoriasis and are showing promise in the treatment of relapsing remitting MS and other T-cell mediated autoimmune diseases.
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Affiliation(s)
- Aoife M McGinley
- School of Biochemistry and Immunology, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin 2, Ireland
| | - Sarah C Edwards
- School of Biochemistry and Immunology, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin 2, Ireland
| | - Mathilde Raverdeau
- School of Biochemistry and Immunology, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin 2, Ireland
| | - Kingston H G Mills
- School of Biochemistry and Immunology, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin 2, Ireland.
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12
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Azcutia V, Bassil R, Herter JM, Engelbertsen D, Newton G, Autio A, Mayadas T, Lichtman AH, Khoury SJ, Parkos CA, Elyaman W, Luscinskas FW. Defects in CD4+ T cell LFA-1 integrin-dependent adhesion and proliferation protect Cd47-/- mice from EAE. J Leukoc Biol 2016; 101:493-505. [PMID: 27965383 DOI: 10.1189/jlb.3a1215-546rr] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2015] [Revised: 08/26/2016] [Accepted: 08/29/2016] [Indexed: 11/24/2022] Open
Abstract
CD47 is known to play an important role in CD4+ T cell homeostasis. We recently reported a reduction in mice deficient in the Cd47 gene (Cd47-/-) CD4+ T cell adhesion and transendothelial migration (TEM) in vivo and in vitro as a result of impaired expression of high-affinity forms of LFA-1 and VLA-4 integrins. A prior study concluded that Cd47-/- mice were resistant to experimental autoimmune encephalomyelitis (EAE) as a result of complete failure in CD4+ T cell activation after myelin oligodendrocyte glycoprotein peptide 35-55 aa (MOG35-55) immunization. As the prior EAE study was published before our report, authors could not have accounted for defects in T cell integrin function as a mechanism to protect Cd47-/- in EAE. Thus, we hypothesized that failure of T cell activation involved defects in LFA-1 and VLA-4 integrins. We confirmed that Cd47-/- mice were resistant to MOG35-55-induced EAE. Our data, however, supported a different mechanism that was not a result of failure of CD4+ T cell activation. Instead, we found that CD4+ T cells in MOG35-55-immunized Cd47-/- mice were activated, but clonal expansion contracted within 72 h after immunization. We used TCR crosslinking and mitogen activation in vitro to investigate the underlying mechanism. We found that naïve Cd47-/- CD4+ T cells exhibited a premature block in proliferation and survival because of impaired activation of LFA-1, despite effective TCR-induced activation. These results identify CD47 as an important regulator of LFA-1 and VLA-4 integrin-adhesive functions in T cell proliferation, as well as recruitment, and clarify the roles played by CD47 in MOG35-55-induced EAE.
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Affiliation(s)
- Veronica Azcutia
- Center for Excellence in Vascular Biology, Department of Pathology, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, USA
| | - Ribal Bassil
- Ann Romney Center for Neurologic Diseases, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, USA
| | - Jan M Herter
- Center for Excellence in Vascular Biology, Department of Pathology, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, USA
| | - Daniel Engelbertsen
- Center for Excellence in Vascular Biology, Department of Pathology, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, USA
| | - Gail Newton
- Center for Excellence in Vascular Biology, Department of Pathology, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, USA
| | - Anu Autio
- Center for Excellence in Vascular Biology, Department of Pathology, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, USA
| | - Tanya Mayadas
- Center for Excellence in Vascular Biology, Department of Pathology, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, USA
| | - Andrew H Lichtman
- Center for Excellence in Vascular Biology, Department of Pathology, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, USA
| | - Samia J Khoury
- Ann Romney Center for Neurologic Diseases, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, USA.,Abou Haidar Neuroscience Institute, American University of Beirut, Lebanon; and
| | - Charles A Parkos
- Department of Pathology, University of Michigan, Ann Arbor, Michigan, USA
| | - Wassim Elyaman
- Ann Romney Center for Neurologic Diseases, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, USA;
| | - Francis W Luscinskas
- Center for Excellence in Vascular Biology, Department of Pathology, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, USA;
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13
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Retinoic acid suppresses IL‐17 production and pathogenic activity of γδ T cells in CNS autoimmunity. Immunol Cell Biol 2016; 94:763-73. [DOI: 10.1038/icb.2016.39] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2016] [Revised: 04/12/2016] [Accepted: 04/13/2016] [Indexed: 12/26/2022]
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14
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Malik S, Want MY, Awasthi A. The Emerging Roles of Gamma-Delta T Cells in Tissue Inflammation in Experimental Autoimmune Encephalomyelitis. Front Immunol 2016; 7:14. [PMID: 26858718 PMCID: PMC4731487 DOI: 10.3389/fimmu.2016.00014] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2015] [Accepted: 01/12/2016] [Indexed: 12/13/2022] Open
Abstract
γδ (gamma–delta) T cells, a small population of unconventional T cells, have been found in central nervous system lesions of multiple sclerosis (MS) patients, but their function in disease activity is not clearly understood. Previous studies in experimental autoimmune encephalomyelitis (EAE) were inconsistent in identifying their specific roles in suppressing or promoting disease pathogenesis. Emerging advancements in the biology of γδ T cells especially in the context of their being the major initial producers of IL-17, suggested their crucial role in pathogenesis of EAE. In addition, γδ T cells express high levels of IL-23R and IL-1R, which further enhance their effector functions in the pathogenesis of EAE. Nonetheless, activated heterogeneous γδ T cells display functional dichotomy, which is crucial in determining the outcomes of tissue inflammation in EAE. In this review, we discussed recent advances in understanding the biology of γδ T cells in tissue inflammation as well as their roles in suppressing or promoting the development of EAE.
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Affiliation(s)
- Sakshi Malik
- Translational Health Science and Technology Institute , Faridabad , India
| | - Muzamil Yaqub Want
- Translational Health Science and Technology Institute , Faridabad , India
| | - Amit Awasthi
- Translational Health Science and Technology Institute , Faridabad , India
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15
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Arellano G, Ottum PA, Reyes LI, Burgos PI, Naves R. Stage-Specific Role of Interferon-Gamma in Experimental Autoimmune Encephalomyelitis and Multiple Sclerosis. Front Immunol 2015; 6:492. [PMID: 26483787 PMCID: PMC4586507 DOI: 10.3389/fimmu.2015.00492] [Citation(s) in RCA: 106] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Accepted: 09/09/2015] [Indexed: 12/21/2022] Open
Abstract
The role of interferon (IFN)-γ in multiple sclerosis (MS) and its animal model, experimental autoimmune encephalomyelitis (EAE), has remained as an enigmatic paradox for more than 30 years. Several studies attribute this cytokine a prominent proinflammatory and pathogenic function in these pathologies. However, accumulating evidence shows that IFN-γ also plays a protective role inducing regulatory cell activity and modulating the effector T cell response. Several innate and adaptive immune cells also develop opposite functions strongly associated with the production of IFN-γ in EAE. Even the suppressive activity of different types of regulatory cells is dependent on IFN-γ. Interestingly, recent data supports a stage-specific participation of IFN-γ in EAE providing a plausible explanation for previous conflicting results. In this review, we will summarize and discuss such literature, emphasizing the protective role of IFN-γ on immune cells. These findings are fundamental to understand the complex role of IFN-γ in the pathogenesis of these diseases and can provide basis for potential stage-specific therapy for MS targeting IFN-γ-signaling or IFN-γ-producing immune cells.
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Affiliation(s)
- Gabriel Arellano
- Immunology Program, Biomedical Sciences Institute, School of Medicine, Universidad de Chile , Santiago , Chile
| | - Payton A Ottum
- Immunology Program, Biomedical Sciences Institute, School of Medicine, Universidad de Chile , Santiago , Chile
| | - Lilian I Reyes
- Faculty of Science, Universidad San Sebastián , Santiago , Chile
| | - Paula I Burgos
- Department of Clinical Immunology and Rheumatology, School of Medicine, Pontificia Universidad Católica de Chile , Santiago , Chile
| | - Rodrigo Naves
- Immunology Program, Biomedical Sciences Institute, School of Medicine, Universidad de Chile , Santiago , Chile
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16
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Abstract
γδ T cells represent a small population of overall T lymphocytes (0.5-5%) and have variable tissue distribution in the body. γδ T cells can perform complex functions, such as immune surveillance, immunoregulation, and effector function, without undergoing clonal expansion. Heterogeneous distribution and anatomic localization of γδ T cells in the normal and inflamed tissues play an important role in alloimmunity, autoimmunity, or immunity. The cross-talk between γδ T cells and other immune cells and phenotypic and functional plasticity of γδ T cells have been given recent attention in the field of immunology. In this review, we discussed the cellular and molecular interaction of γδ T cells with other immune cells and its mechanism in the pathogenesis of various autoimmune diseases.
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Affiliation(s)
- Sourav Paul
- National Centre for Cell Science, Pune University Campus, Pune, India
| | - Shilpi
- National Centre for Cell Science, Pune University Campus, Pune, India
| | - Girdhari Lal
- National Centre for Cell Science, Pune University Campus, Pune, India
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17
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Turvey ME, Koudelka T, Comerford I, Greer JM, Carroll W, Bernard CCA, Hoffmann P, McColl SR. Quantitative proteome profiling of CNS-infiltrating autoreactive CD4+ cells reveals selective changes during experimental autoimmune encephalomyelitis. J Proteome Res 2014; 13:3655-70. [PMID: 24933266 DOI: 10.1021/pr500158r] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Experimental autoimmune encephalomyelitis (EAE) is a murine model of multiple sclerosis, a chronic neurodegenerative and inflammatory autoimmune condition of the central nervous system (CNS). Pathology is driven by the infiltration of autoreactive CD4(+) lymphocytes into the CNS, where they attack neuronal sheaths causing ascending paralysis. We used an isotope-coded protein labeling approach to investigate the proteome of CD4(+) cells isolated from the spinal cord and brain of mice at various stages of EAE progression in two EAE disease models: PLP139-151-induced relapsing-remitting EAE and MOG35-55-induced chronic EAE, which emulate the two forms of human multiple sclerosis. A total of 1120 proteins were quantified across disease onset, peak-disease, and remission phases of disease, and of these 13 up-regulated proteins of interest were identified with functions relating to the regulation of inflammation, leukocyte adhesion and migration, tissue repair, and the regulation of transcription/translation. Proteins implicated in processes such as inflammation (S100A4 and S100A9) and tissue repair (annexin A1), which represent key events during EAE progression, were validated by quantitative PCR. This is the first targeted analysis of autoreactive cells purified from the CNS during EAE, highlighting fundamental CD4(+) cell-driven processes that occur during the initiation of relapse and remission stages of disease.
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Affiliation(s)
- Michelle E Turvey
- Chemokine Biology Laboratory, School of Molecular and Biomedical Science, University of Adelaide and Centre for Molecular Pathology , South Australia 5005, Australia
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18
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Xie L, Sun F, Wang J, Mao X, Xie L, Yang SH, Su DM, Simpkins JW, Greenberg DA, Jin K. mTOR signaling inhibition modulates macrophage/microglia-mediated neuroinflammation and secondary injury via regulatory T cells after focal ischemia. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2014; 192:6009-19. [PMID: 24829408 PMCID: PMC4128178 DOI: 10.4049/jimmunol.1303492] [Citation(s) in RCA: 123] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Signaling by the mammalian target of rapamycin (mTOR) plays an important role in the modulation of both innate and adaptive immune responses. However, the role and underlying mechanism of mTOR signaling in poststroke neuroinflammation are largely unexplored. In this study, we injected rapamycin, a mTOR inhibitor, by the intracerebroventricular route 6 h after focal ischemic stroke in rats. We found that rapamycin significantly reduced lesion volume and improved behavioral deficits. Notably, infiltration of γδ T cells and granulocytes, which are detrimental to the ischemic brain, was profoundly reduced after rapamycin treatment, as was the production of proinflammatory cytokines and chemokines by macrophages and microglia. Rapamycin treatment prevented brain macrophage polarization toward the M1 type. In addition, we also found that rapamycin significantly enhanced anti-inflammation activity of regulatory T cells (Tregs), which decreased production of proinflammatory cytokines and chemokines by macrophages and microglia. Depletion of Tregs partially elevated macrophage/microglia-induced neuroinflammation after stroke. Our data suggest that rapamycin can attenuate secondary injury and motor deficits after focal ischemia by enhancing the anti-inflammation activity of Tregs to restrain poststroke neuroinflammation.
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Affiliation(s)
- Luokun Xie
- Department of Pharmacology and Neuroscience, Institute for Aging and Alzheimer's Disease Research, University of North Texas Health Science Center, Fort Worth, TX 76107
| | - Fen Sun
- Department of Pharmacology and Neuroscience, Institute for Aging and Alzheimer's Disease Research, University of North Texas Health Science Center, Fort Worth, TX 76107
| | - Jixian Wang
- Department of Pharmacology and Neuroscience, Institute for Aging and Alzheimer's Disease Research, University of North Texas Health Science Center, Fort Worth, TX 76107; Department of Neurology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - XiaoOu Mao
- Buck Institute for Research on Aging, Novato, CA 94945; and
| | - Lin Xie
- Buck Institute for Research on Aging, Novato, CA 94945; and
| | - Shao-Hua Yang
- Department of Pharmacology and Neuroscience, Institute for Aging and Alzheimer's Disease Research, University of North Texas Health Science Center, Fort Worth, TX 76107
| | - Dong-Ming Su
- Department of Pharmacology and Neuroscience, Institute for Aging and Alzheimer's Disease Research, University of North Texas Health Science Center, Fort Worth, TX 76107
| | - James W Simpkins
- Department of Pharmacology and Neuroscience, Institute for Aging and Alzheimer's Disease Research, University of North Texas Health Science Center, Fort Worth, TX 76107; Department of Physiology and Pharmacology, Center for Neuroscience, Health Science Center, West Virginia University, Morgantown, WV 26506
| | | | - Kunlin Jin
- Department of Pharmacology and Neuroscience, Institute for Aging and Alzheimer's Disease Research, University of North Texas Health Science Center, Fort Worth, TX 76107;
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19
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Blink SE, Caldis MW, Goings GE, Harp CT, Malissen B, Prinz I, Xu D, Miller SD. γδ T cell subsets play opposing roles in regulating experimental autoimmune encephalomyelitis. Cell Immunol 2014; 290:39-51. [PMID: 24860937 DOI: 10.1016/j.cellimm.2014.04.013] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2014] [Revised: 04/21/2014] [Accepted: 04/28/2014] [Indexed: 12/29/2022]
Abstract
γδ T cells are resident in cerebrospinal fluid and central nervous system (CNS) lesions of multiple sclerosis (MS) patients, but as multifaceted cells exhibiting innate and adaptive characteristics, their function remains unknown. Previous studies in experimental autoimmune encephalomyelitis (EAE) are contradictory and identified these cells as either promoting or suppressing disease pathogenesis. This study examines distinct γδ T cell subsets during EAE and indicates they mediate differential functions in CNS inflammation and demyelination resulting in pathogenesis or protection. We identified two γδ subsets in the CNS, Vγ1(+) and Vγ4(+), with distinct cytokine profiles and tissue specificity. Anti-γδ T cell receptor (TCR) monoclonal antibody (mAb) administration results in activation and downregulation of surface TCR, rendering the cells undetectable, but with opposing effects: anti-Vγ4 treatment exacerbates disease whereas anti-Vγ1 treatment is protective. The Vγ4(+) subset produces multiple pro-inflammatory cytokines including high levels of IL-17, and accounts for 15-20% of the interleukin-17 (IL-17) producing cells in the CNS, but utilize a variant transcriptional program than CD4(+) Th17 cells. In contrast, the Vγ1 subset produces CCR5 ligands, which may promote regulatory T cell differentiation. γδ T cell subsets thus play distinct and opposing roles during EAE, providing an explanation for previous reports and suggesting selective targeting to optimize regulation as a potential therapy for MS.
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Affiliation(s)
- Sarah E Blink
- Department of Microbiology-Immunology and Interdepartmental Immunobiology Center, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, United States
| | - Matthew W Caldis
- Department of Microbiology-Immunology and Interdepartmental Immunobiology Center, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, United States
| | - Gwendolyn E Goings
- Department of Microbiology-Immunology and Interdepartmental Immunobiology Center, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, United States
| | - Christopher T Harp
- Department of Microbiology-Immunology and Interdepartmental Immunobiology Center, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, United States
| | - Bernard Malissen
- Centre d'Immunologie de Marseille-Luminy, Université de la Méditerranée, Case 906, Institut National de la Santé et de la Recherche Médicale, U631, Centre National de la Recherche Scientifique, UMR6102, 13288 Marseille, France
| | - Immo Prinz
- Hannover Medical School, Institute for Immunology, 30625 Hannover, Germany
| | - Dan Xu
- Department of Microbiology-Immunology and Interdepartmental Immunobiology Center, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, United States
| | - Stephen D Miller
- Department of Microbiology-Immunology and Interdepartmental Immunobiology Center, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, United States.
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20
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Bullard DC, Hu X, Crawford D, McDonald K, Ramos TN, Barnum SR. Expression of a single ICAM-1 isoform on T cells is sufficient for development of experimental autoimmune encephalomyelitis. Eur J Immunol 2014; 44:1194-9. [PMID: 24435747 DOI: 10.1002/eji.201344023] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2013] [Revised: 12/02/2013] [Accepted: 01/13/2014] [Indexed: 01/30/2023]
Abstract
Intercellular adhesion molecule-1 (ICAM-1) plays an important role in leukocyte trafficking, induction of cellular immune responses, and immunological synapse formation. As a member of the immunoglobulin superfamily of adhesion proteins, ICAM-1 is composed of repeating Ig-like domains, a transmembrane domain, and short cytoplasmic tail that participates in intracellular signaling events. At least seven ICAM-1 protein isoforms are generated by alternative splicing, however little is known regarding their immunobiology. We have previously shown using different lines of ICAM-1 mutant mice (Icam1(tm1Jcgr) and Icam1(tm1Bay) ) that expression of alternatively spliced ICAM-1 isoforms can significantly influence the disease course during the development of EAE. In this study, we show using a newly developed transgenic mouse (CD2-Icam1(D4del) /Icam1(null) ) that T-cell-specific expression of a single ICAM-1 isoform composed of Ig domains 1, 2, 3, and 5 can mediate the initiation and progression of EAE. Our results indicate that the ICAM-1 isoform lacking Ig domain 4 can drive pathogenesis in demyelinating disease and may be a novel therapeutic target for treating multiple sclerosis.
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Affiliation(s)
- Daniel C Bullard
- Department of Genetics, University of Alabama at Birmingham, Birmingham, AL, USA
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21
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Serre K, Silva-Santos B. Molecular Mechanisms of Differentiation of Murine Pro-Inflammatory γδ T Cell Subsets. Front Immunol 2013; 4:431. [PMID: 24367369 PMCID: PMC3852037 DOI: 10.3389/fimmu.2013.00431] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2013] [Accepted: 11/21/2013] [Indexed: 12/24/2022] Open
Abstract
γδ T cells are unconventional innate-like lymphocytes that actively participate in protective immunity against tumors and infectious organisms including bacteria, viruses, and parasites. However, γδ T cells are also involved in the development of inflammatory and autoimmune diseases. γδ T cells are functionally characterized by very rapid production of pro-inflammatory cytokines, while also impacting on (slower but long-lasting) adaptive immune responses. This makes it crucial to understand the molecular mechanisms that regulate γδ T cell effector functions. Although they share many similarities with αβ T cells, our knowledge of the molecular pathways that control effector functions in γδ T cells still lags significantly behind. In this review, we focus on the segregation of interferon-γ versus interleukin-17 production in murine thymic-derived γδ T cell subsets defined by CD27 and CCR6 expression levels. We summarize the most recent studies that disclose the specific epigenetic and transcriptional mechanisms that govern the stability or plasticity of discrete pro-inflammatory γδ T cell subsets, whose manipulation may be valuable for regulating (auto)immune responses.
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Affiliation(s)
- Karine Serre
- Faculdade de Medicina, Instituto de Medicina Molecular, Universidade de Lisboa , Lisbon , Portugal
| | - Bruno Silva-Santos
- Faculdade de Medicina, Instituto de Medicina Molecular, Universidade de Lisboa , Lisbon , Portugal
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22
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Gray EE, Ramírez-Valle F, Xu Y, Wu S, Wu Z, Karjalainen KE, Cyster JG. Deficiency in IL-17-committed Vγ4(+) γδ T cells in a spontaneous Sox13-mutant CD45.1(+) congenic mouse substrain provides protection from dermatitis. Nat Immunol 2013; 14:584-92. [PMID: 23624556 PMCID: PMC3660499 DOI: 10.1038/ni.2585] [Citation(s) in RCA: 165] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2012] [Accepted: 03/06/2013] [Indexed: 12/13/2022]
Abstract
Interleukin 17 (IL-17)-committed γδ T cells (γδT17 cells) participate in many immune responses, but their developmental requirements and subset specific functions remain poorly understood. Here we report that a commonly used CD45.1(+) congenic C57BL/6 mouse substrain is characterized by selective deficiency in Vγ4(+) γδT17 cells. This trait was due to a spontaneous mutation in the gene encoding the transcription factor Sox13 that caused an intrinsic defect in development of those cells in the neonatal thymus. The γδT17 cells migrated from skin to lymph nodes at low rates. In a model of psoriasis-like dermatitis, the Vγ4(+) γδT17 cell subset expanded considerably in lymph nodes and homed to inflamed skin. Sox13-mutant mice were protected from psoriasis-like skin changes, which identified a role for Sox13-dependent γδT17 cells in this inflammatory condition.
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MESH Headings
- Animals
- Animals, Newborn
- Autoantigens/genetics
- Autoantigens/immunology
- Autoantigens/metabolism
- Cells, Cultured
- Dermatitis/genetics
- Dermatitis/immunology
- Dermatitis/metabolism
- Flow Cytometry
- Interleukin-17/genetics
- Interleukin-17/immunology
- Interleukin-17/metabolism
- Leukocyte Common Antigens/genetics
- Leukocyte Common Antigens/immunology
- Leukocyte Common Antigens/metabolism
- Lymph Nodes/immunology
- Lymph Nodes/metabolism
- Lymph Nodes/pathology
- Mice
- Mice, Congenic
- Mice, Inbred C57BL
- Mice, Inbred ICR
- Mice, Inbred NOD
- Mice, Knockout
- Mutation
- Psoriasis/genetics
- Psoriasis/immunology
- Psoriasis/metabolism
- Receptors, Antigen, T-Cell, gamma-delta/immunology
- Receptors, Antigen, T-Cell, gamma-delta/metabolism
- T-Lymphocyte Subsets/immunology
- T-Lymphocyte Subsets/metabolism
- Thymus Gland/immunology
- Thymus Gland/metabolism
- Thymus Gland/pathology
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Affiliation(s)
- Elizabeth E. Gray
- Howard Hughes Medical Institute, University of California San Francisco (UCSF), California, USA
- Department of Microbiology and Immunology, University of California San Francisco (UCSF), California, USA
- Biomedical Sciences Graduate Program, University of California San Francisco (UCSF), California, USA
| | - Francisco Ramírez-Valle
- Howard Hughes Medical Institute, University of California San Francisco (UCSF), California, USA
- Department of Microbiology and Immunology, University of California San Francisco (UCSF), California, USA
- Department of Dermatology, University of California San Francisco (UCSF), California, USA
| | - Ying Xu
- Howard Hughes Medical Institute, University of California San Francisco (UCSF), California, USA
- Department of Microbiology and Immunology, University of California San Francisco (UCSF), California, USA
| | - Shuang Wu
- Howard Hughes Medical Institute, University of California San Francisco (UCSF), California, USA
- Department of Microbiology and Immunology, University of California San Francisco (UCSF), California, USA
| | - Zhihao Wu
- School of Biological Sciences, Nanyang Technological University, Singapore
| | | | - Jason G. Cyster
- Howard Hughes Medical Institute, University of California San Francisco (UCSF), California, USA
- Department of Microbiology and Immunology, University of California San Francisco (UCSF), California, USA
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23
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Ramos TN, Bullard DC, Darley MM, McDonald K, Crawford DF, Barnum SR. Experimental cerebral malaria develops independently of endothelial expression of intercellular adhesion molecule-1 (icam-1). J Biol Chem 2013; 288:10962-6. [PMID: 23493396 DOI: 10.1074/jbc.c113.457028] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Cerebral malaria (CM) is a severe clinical complication of Plasmodium falciparum malaria infection and is characterized by a high fatality rate and neurological damage. Sequestration of parasite-infected red blood cells in brain microvasculature utilizes host- and parasite-derived adhesion molecules and is an important factor in the development of CM. ICAM-1, an alternatively spliced adhesion molecule, is believed to be critical on endothelial cells for infected red blood cell sequestration in CM. Using ICAM-1 mutant mice, we found that the full-length ICAM-1 isoform is not required for development of murine experimental CM (ECM) and that ECM phenotype varies with the combination of ICAM-1 isoforms expressed. Furthermore, we observed development of ECM in transgenic mice expressing ICAM-1 only on leukocytes, indicating that endothelial cell expression of this adhesion molecule is not required for disease pathogenesis. We propose that ICAM-1-dependent cellular aggregation, independent of ICAM-1 expression on the cerebral microvasculature, contributes to ECM.
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Affiliation(s)
- Theresa N Ramos
- Department of Microbiology and Neurology, University of Alabama, Birmingham, Alabama 35294, USA
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24
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Darley MM, Ramos TN, Wetsel RA, Barnum SR. Deletion of carboxypeptidase N delays onset of experimental cerebral malaria. Parasite Immunol 2013; 34:444-7. [PMID: 22708514 DOI: 10.1111/j.1365-3024.2012.01376.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Complement contributes to inflammation during pathogen infections; however, less is known regarding its role during malaria and in the severest form of the disease, cerebral malaria. Recent studies have shown that deletion of the complement anaphylatoxins receptors, C3aR and C5aR, does not alter disease susceptibility in experimental cerebral malaria (ECM). This does not, however, preclude C3a- and C5a-mediated contributions to inflammation in ECM and raises the possibility that carboxypeptidase regulation of anaphylatoxin activity rapidly over rides their functions. To address this question, we performed ECM using carboxypeptidase N-deficient (CPN(-/-)) mice. Unexpectedly, we found that CPN(-/-) mice survived longer than wild-type mice, but they were fully susceptible to ECM. CD4(+) and CD8(+) T cell infiltration was not reduced at the peak of disease in CPN(-/-) mice, and there was no corresponding reduction in pro-inflammatory cytokine production. Our results indicate that carboxypeptidases contribute to the pathogenesis of ECM and that studies examining the contribution of other carboxypeptidase families and family members may provide greater insight into the role these enzymes play in malaria.
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Affiliation(s)
- M M Darley
- Department of Microbiology, University of Alabama at Birmingham, Birmingham, AL 35294, USA
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25
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Ribot JC, Silva-Santos B. Differentiation and activation of γδ T Lymphocytes: Focus on CD27 and CD28 costimulatory receptors. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2013; 785:95-105. [PMID: 23456842 DOI: 10.1007/978-1-4614-6217-0_11] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
γδ T lymphocytes are major providers of the pro-inflammatory cytokines interferon-γ (IFN-γ) and interleukin-17 (IL-17) at early stages of (auto)immune responses. We and others have recently described the phenotype and differentiation requirements of two distinct murine γδ T cell subsets producing either IFN-γ or IL-17. Here we summarize our current understanding of the molecular mechanisms that control γδ T cell differentiation, which is programmed in the thymus, and peripheral activation upon infection. We focus on the costimulatory receptors CD27 and CD28, which play independent and non-redundant roles in the physiology of γδ T cells in mice and in humans.
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Affiliation(s)
- Julie C Ribot
- Molecular Immunology Unit, Faculdade de Medicinal, Institutor de Medicinal Molecular, Universidade de Lisboa, Portugal.
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26
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Manikwar P, Kiptoo P, Badawi AH, Büyüktimkin B, Siahaan TJ. Antigen-specific blocking of CD4-specific immunological synapse formation using BPI and current therapies for autoimmune diseases. Med Res Rev 2012; 32:727-64. [PMID: 21433035 PMCID: PMC4441537 DOI: 10.1002/med.20243] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
In this review, we discuss T-cell activation, etiology, and the current therapies of autoimmune diseases (i.e., MS, T1D, and RA). T-cells are activated upon interaction with antigen-presenting cells (APC) followed by a "bull's eye"-like formation of the immunological synapse (IS) at the T-cell-APC interface. Although the various disease-modifying therapies developed so far have been shown to modulate the IS and thus help in the management of these diseases, they are also known to present some undesirable side effects. In this study, we describe a novel and selective way to suppress autoimmunity by using a bifunctional peptide inhibitor (BPI). BPI uses an intercellular adhesion molecule-1 (ICAM-1)-binding peptide to target antigenic peptides (e.g., proteolipid peptide, glutamic acid decarboxylase, and type II collagen) to the APC and therefore modulate the immune response. The central hypothesis is that BPI blocks the IS formation by simultaneously binding to major histocompatibility complex-II and ICAM-1 on the APC and selectively alters the activation of T cells from T(H)1 to T(reg) and/or T(H)2 phenotypes, leading to tolerance.
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Affiliation(s)
- Prakash Manikwar
- Department of Pharmaceutical Chemistry, University of Kansas, Lawrence, KA 66047, USA
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27
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Ramos TN, Darley MM, Weckbach S, Stahel PF, Tomlinson S, Barnum SR. The C5 convertase is not required for activation of the terminal complement pathway in murine experimental cerebral malaria. J Biol Chem 2012; 287:24734-8. [PMID: 22689574 DOI: 10.1074/jbc.c112.378364] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Cerebral malaria (CM) is the most severe manifestation of clinical malaria syndromes and has a high fatality rate especially in the developing world. Recent studies demonstrated that C5(-/-) mice are resistant to experimental CM (ECM) and that protection was due to the inability to form the membrane attack complex. Unexpectedly, we observed that C4(-/-) and factor B(-/-) mice were fully susceptible to disease, indicating that activation of the classical or alternative pathways is not required for ECM. C3(-/-) mice were also susceptible to ECM, indicating that the canonical C5 convertases are not required for ECM development and progression. Abrogation of ECM by treatment with anti-C9 antibody and detection of C5a in serum of C3(-/-) mice confirmed that C5 activation occurs in ECM independent of C5 convertases. Our data indicate that activation of C5 in ECM likely occurs via coagulation enzymes of the extrinsic protease pathway.
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Affiliation(s)
- Theresa N Ramos
- Department of Microbiology, University of Alabama, Birmingham, Alabama 35294, USA
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28
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Korn T, Petermann F. Development and function of interleukin 17-producing γδ T cells. Ann N Y Acad Sci 2012; 1247:34-45. [DOI: 10.1111/j.1749-6632.2011.06355.x] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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29
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Mabuchi T, Takekoshi T, Hwang ST. Epidermal CCR6+ γδ T cells are major producers of IL-22 and IL-17 in a murine model of psoriasiform dermatitis. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2011; 187:5026-31. [PMID: 21984702 DOI: 10.4049/jimmunol.1101817] [Citation(s) in RCA: 130] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Cytokine components of Th17 pathway play vital roles in human psoriasis. Although much is known about TCR αβ T cells in psoriasis, the role of unconventional T cells, including γδ T cells, is unclear. In this study, using an IL-23 skin injection model of psoriasiform dermatitis in mice, we demonstrate that IL-22, IL-17A, and the IL-23R were highly enriched in a population of CCR6(+), TCR γδ-low expressing (GDL) T cells that accumulated in the epidermis after IL-23 injections. GDL cells were distinct from resident TCR γδ-high, Vγ3(+),CCR6(-) T cells in the epidermis that did not change appreciably in numbers following IL-23 injection. Large numbers of CCR6(+) cells were detected at or above the level of the epidermal basement membrane by confocal microscopy 5 d after repeated IL-23 injections at the same time GDL cells increased in numbers in the epidermis. TCR δ-deficient mice (lacking γδ T cells) exhibited decreased ear swelling and downregulated expression of IL-22 and IL-17A in the epidermis following IL-23 injection. Our data suggest that a subset of γδ T cells play a critical role in IL-23-mediated psoriasiform dermatitis.
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Affiliation(s)
- Tomotaka Mabuchi
- Department of Dermatology, Medical College of Wisconsin, Milwaukee, WI 53226, USA
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30
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Ness-Schwickerath KJ, Morita CT. Regulation and function of IL-17A- and IL-22-producing γδ T cells. Cell Mol Life Sci 2011; 68:2371-90. [PMID: 21573786 PMCID: PMC3152582 DOI: 10.1007/s00018-011-0700-z] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2011] [Revised: 04/19/2011] [Accepted: 04/20/2011] [Indexed: 12/21/2022]
Abstract
The regulation of IL-17A and IL-22 production differs between human and murine γδ T cells. We find that human γδ T cells expressing Vγ2Vδ2 T cell receptors are peripherally polarized to produce IL-17A or IL-22, much like CD4 αβ Th17 T cells. This requires IL-6, IL-1β, and TGF-β, whereas expansion and maintenance requires IL-23, IL-1β, and TGF-β. In contrast, IL-17A and IL-22 production by murine γδ T cells is innately programmed during thymic ontogeny but requires IL-23 and IL-1β for maintenance. Murine γδ cells producing IL-17A and IL-22 play important roles in microbial, autoimmune, and inflammatory responses. However, the roles played by human IL-17A- and IL-22-producing γδ T cells are less clear but are also likely to be important. These observations highlight differences between humans and murine γδ T cells and underscore the importance of IL-17A- and IL-22-producing γδ T cells.
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Affiliation(s)
- Kristin J. Ness-Schwickerath
- Division of Immunology, Department of Internal Medicine and the Interdisciplinary Graduate Program in Immunology, University of Iowa Carver College of Medicine, EMRB 400F, Iowa City, IA 52242 USA
| | - Craig T. Morita
- Division of Immunology, Department of Internal Medicine and the Interdisciplinary Graduate Program in Immunology, University of Iowa Carver College of Medicine, EMRB 400F, Iowa City, IA 52242 USA
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31
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Ramos TN, Darley MM, Hu X, Billker O, Rayner JC, Ahras M, Wohler JE, Barnum SR. Cutting edge: the membrane attack complex of complement is required for the development of murine experimental cerebral malaria. THE JOURNAL OF IMMUNOLOGY 2011; 186:6657-60. [PMID: 21572031 DOI: 10.4049/jimmunol.1100603] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Cerebral malaria is the most severe complication of Plasmodium falciparum infection and accounts for a large number of malaria fatalities worldwide. Recent studies demonstrated that C5(-/-) mice are resistant to experimental cerebral malaria (ECM) and suggested that protection was due to loss of C5a-induced inflammation. Surprisingly, we observed that C5aR(-/-) mice were fully susceptible to disease, indicating that C5a is not required for ECM. C3aR(-/-) and C3aR(-/-) × C5aR(-/-) mice were equally susceptible to ECM as were wild-type mice, indicating that neither complement anaphylatoxin receptor is critical for ECM development. In contrast, C9 deposition in the brains of mice with ECM suggested an important role for the terminal complement pathway. Treatment with anti-C9 Ab significantly increased survival time and reduced mortality in ECM. Our data indicate that protection from ECM in C5(-/-) mice is mediated through inhibition of membrane attack complex formation and not through C5a-induced inflammation.
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Affiliation(s)
- Theresa N Ramos
- Department of Microbiology, University of Alabama at Birmingham, Birmingham, AL 35294, USA
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32
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Piali L, Froidevaux S, Hess P, Nayler O, Bolli MH, Schlosser E, Kohl C, Steiner B, Clozel M. The Selective Sphingosine 1-Phosphate Receptor 1 Agonist Ponesimod Protects against Lymphocyte-Mediated Tissue Inflammation. J Pharmacol Exp Ther 2011; 337:547-56. [DOI: 10.1124/jpet.110.176487] [Citation(s) in RCA: 82] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
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33
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Reynolds JM, Angkasekwinai P, Dong C. IL-17 family member cytokines: regulation and function in innate immunity. Cytokine Growth Factor Rev 2010; 21:413-23. [PMID: 21074482 DOI: 10.1016/j.cytogfr.2010.10.002] [Citation(s) in RCA: 174] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Recently, the IL-17 family member cytokines have become prominent subjects of investigation. IL-17 (IL-17A) is the best-described member of this family where its production has been mainly attributed to a specialized T helper subset of the adaptive immune response termed Th17. However, recent research on this and other Th17 cytokines has revealed new sources and functions of IL-17 family members in the innate immune response. This review will highlight recent advances in the field of IL-17 family member cytokines and will predominantly focus on the innate regulation and function of IL-17, IL-17F, and IL-25.
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Affiliation(s)
- Joseph M Reynolds
- Department of Immunology and Center for Inflammation and Cancer, M.D. Anderson Cancer Center, Houston, TX 77054, USA
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34
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Petermann F, Rothhammer V, Claussen MC, Haas JD, Riol Blanco L, Heink S, Prinz I, Hemmer B, Kuchroo VK, Oukka M, Korn T. γδ T cells enhance autoimmunity by restraining regulatory T cell responses via an interleukin-23-dependent mechanism. Immunity 2010; 33:351-63. [PMID: 20832339 PMCID: PMC3008772 DOI: 10.1016/j.immuni.2010.08.013] [Citation(s) in RCA: 213] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2010] [Revised: 07/14/2010] [Accepted: 07/27/2010] [Indexed: 02/08/2023]
Abstract
Mice that lack interleukin-23 (IL-23) are resistant to T cell-mediated autoimmunity. Although IL-23 is a maturation factor for T helper 17 (Th17) cells, a subset of γδ T cells expresses the IL-23 receptor (IL-23R) constitutively. Using IL-23R reporter mice, we showed that γδ T cells were the first cells to respond to IL-23 during experimental autoimmune encephalomyelitis (EAE). Although γδ T cells produced Th17 cell-associated cytokines in response to IL-23, their major function was to prevent the development of regulatory T (Treg) cell responses. IL-23-activated γδ T cells rendered αβ effector T cells refractory to the suppressive activity of Treg cells and also prevented the conversion of conventional T cells into Foxp3(+) Treg cells in vivo. Thus, IL-23, which by itself has no direct effect on Treg cells, is able to disarm Treg cell responses and promote antigen-specific effector T cell responses via activating γδ T cells.
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MESH Headings
- Amino Acid Sequence
- Animals
- Autoimmunity
- Encephalomyelitis, Autoimmune, Experimental/etiology
- Interleukin-17/biosynthesis
- Interleukin-23/physiology
- Interleukins/biosynthesis
- Mice
- Mice, Inbred C57BL
- Molecular Sequence Data
- Receptors, Antigen, T-Cell/physiology
- Receptors, Antigen, T-Cell, gamma-delta/physiology
- Receptors, Interleukin/physiology
- T-Lymphocytes, Regulatory/immunology
- Interleukin-22
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Affiliation(s)
- Franziska Petermann
- Klinikum rechts der Isar, Department of Neurology, Technical University Munich, Ismaninger Str. 22, 81675 Munich, Germany
| | - Veit Rothhammer
- Klinikum rechts der Isar, Department of Neurology, Technical University Munich, Ismaninger Str. 22, 81675 Munich, Germany
| | - Malte C. Claussen
- Klinikum rechts der Isar, Department of Neurology, Technical University Munich, Ismaninger Str. 22, 81675 Munich, Germany
| | - Jan D. Haas
- Hannover Medical School, Institute for Immunology, 30625 Hannover, Germany
| | | | - Sylvia Heink
- Klinikum rechts der Isar, Department of Neurology, Technical University Munich, Ismaninger Str. 22, 81675 Munich, Germany
| | - Immo Prinz
- Hannover Medical School, Institute for Immunology, 30625 Hannover, Germany
| | - Bernhard Hemmer
- Klinikum rechts der Isar, Department of Neurology, Technical University Munich, Ismaninger Str. 22, 81675 Munich, Germany
| | - Vijay K. Kuchroo
- Center for Neurologic Diseases, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Mohamed Oukka
- Seattle Children's Hospital, Center for Immunity and Immunotherapies, University of Washington School of Medicine, 1900 Ninth Avenue, M/S C9S-7, Seattle, WA 98101, USA
| | - Thomas Korn
- Klinikum rechts der Isar, Department of Neurology, Technical University Munich, Ismaninger Str. 22, 81675 Munich, Germany
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Kang Z, Altuntas CZ, Gulen MF, Liu C, Giltiay N, Qin H, Liu L, Qian W, Ransohoff RM, Bergmann C, Stohlman S, Tuohy VK, Li X. Astrocyte-restricted ablation of interleukin-17-induced Act1-mediated signaling ameliorates autoimmune encephalomyelitis. Immunity 2010; 32:414-25. [PMID: 20303295 DOI: 10.1016/j.immuni.2010.03.004] [Citation(s) in RCA: 230] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2009] [Revised: 01/09/2010] [Accepted: 03/01/2010] [Indexed: 12/21/2022]
Abstract
Interleukin-17 (IL-17) secreted by T helper 17 (Th17) cells is essential in the development of experimental autoimmune encephalomyelitis (EAE). However, it remains unclear how IL-17-mediated signaling in different cellular compartments participates in the central nervous system (CNS) inflammatory process. We examined CNS inflammation in mice with specific deletion of Act1, a critical component required for IL-17 signaling, in endothelial cells, macrophages and microglia, and neuroectoderm (neurons, astrocytes, and oligodendrocytes). In Act1-deficient mice, Th17 cells showed normal infiltration into the CNS but failed to recruit lymphocytes, neutrophils, and macrophages. Act1 deficiency in endothelial cells or in macrophages and microglia did not substantially impact the development of EAE. However, targeted Act1 deficiency in neuroectoderm-derived CNS-resident cells resulted in markedly reduced severity in EAE. Specifically, Act1-deficient astrocytes showed impaired IL-17-mediated inflammatory gene induction. Thus, astroctyes are critical in IL-17-Act1-mediated leukocyte recruitment during autoimmune-induced inflammation of the CNS.
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Affiliation(s)
- Zizhen Kang
- Department of Immunology, Cleveland Clinic, Cleveland, OH 44195, USA
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36
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Wohler JE, Smith SS, Barnum SR. gammadelta T cells: the overlooked T-cell subset in demyelinating disease. J Neurosci Res 2010; 88:1-6. [PMID: 19610090 DOI: 10.1002/jnr.22176] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
gammadelta T cells represent a small subpopulation of T cells expressing a restricted repertoire of T-cell receptors and, unlike alphabeta T cells, function more as cells of the innate immune system. These cells are found in skin and mucosal sites as well as secondary lymphoid tissues and frequently act as first line of defense sentinels. gammadelta T cells have been implicated in the pathogenesis of demyelinating disease, although little was known regarding their trafficking and effector functions. In this Mini-Review, we highlight recent studies demonstrating that gammadelta T cells migrate rapidly to the CNS during experimental autoimmune encephalomyelitis (EAE), the animal model for multiple sclerosis. gammadelta T-cell trafficking to the CNS is independent of beta(2)-integrins and occurs well before onset of clinical signs of disease, peaking early during the acute phase of disease. gammadelta T-cell-mediated production of inflammatory cytokines, including interferon-gamma and tumor necrosis factor-alpha, appears critical for EAE development, suggesting that these cells may set the stage for activation of other subsets of infiltrating effector cells. These data suggest that gammadelta T cells or subsets of gammadelta T cells may represent a new therapeutic target in demeylinating disease.
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Affiliation(s)
- Jillian E Wohler
- Department of Microbiology, University of Alabama, Birmingham, Alabama, USA
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37
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Zhang L, Jin N, Nakayama M, O'Brien RL, Eisenbarth GS, Born WK. Gamma delta T cell receptors confer autonomous responsiveness to the insulin-peptide B:9-23. J Autoimmun 2010; 34:478-84. [PMID: 20080388 DOI: 10.1016/j.jaut.2009.12.008] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2009] [Accepted: 12/13/2009] [Indexed: 01/05/2023]
Abstract
The range and physical qualities of molecules that act as ligands for the gammadelta T cell receptors (TCRs) remain uncertain. Processed insulin is recognized by alphabeta T cells, which mediate diabetes in non-obese diabetic (NOD) mice. Here, we present evidence that gammadelta T cells in these mice recognize processed insulin as well. Hybridomas generated from NOD spleen and pancreatic lymph nodes included clones expressing gammadelta TCRs that responded specifically to purified islets of Langerhans and to an insulin peptide, but not to intact insulin. The gammadelta TCRs associated with this type of response are diverse, but a cloned gammadelta TCR was sufficient to transfer the response. The response to the insulin peptide was autonomous as demonstrated by stimulating single responder cells in isolation. This study reveals a novel specificity for gammadelta TCRs, and raises the possibility that gammadelta T cells become involved in islet-specific autoimmunity.
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Affiliation(s)
- Li Zhang
- Barbara Davis Center for Childhood Diabetes, University of Colorado Denver, Aurora, CO 80045, USA
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38
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Haas JD, González FHM, Schmitz S, Chennupati V, Föhse L, Kremmer E, Förster R, Prinz I. CCR6 and NK1.1 distinguish between IL-17A and IFN-gamma-producing gammadelta effector T cells. Eur J Immunol 2010; 39:3488-97. [PMID: 19830744 DOI: 10.1002/eji.200939922] [Citation(s) in RCA: 220] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Gammadelta T cells are a potent source of innate IL-17A and IFN-gamma, and they acquire the capacity to produce these cytokines within the thymus. However, the precise stages and required signals that guide this differentiation are unclear. Here we show that the CD24(low) CD44(high) effector gammadelta T cells of the adult thymus are segregated into two lineages by the mutually exclusive expression of CCR6 and NK1.1. Only CCR6+ gammadelta T cells produced IL-17A, while NK1.1+ gammadelta T cells were efficient producers of IFN-gamma but not of IL-17A. Their effector phenotype correlated with loss of CCR9 expression, particularly among the NK1.1+ gammadelta T cells. Accordingly, both gammadelta T-cell subsets were rare in gut-associated lymphoid tissues, but abundant in peripheral lymphoid tissues. There, they provided IL-17A and IFN-gamma in response to TCR-specific and TCR-independent stimuli. IL-12 and IL-18 induced IFN-gamma and IL-23 induced IL-17A production by NK1.1+ or CCR6+ gammadelta T cells, respectively. Importantly, we show that CCR6+ gammadelta T cells are more responsive to TCR stimulation than their NK1.1+ counterparts. In conclusion, our findings support the hypothesis that CCR6+ IL-17A-producing gammadelta T cells derive from less TCR-dependent selection events than IFN-gamma-producing NK1.1+ gammadelta T cells.
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Affiliation(s)
- Jan D Haas
- Hannover Medical School, Institute for Immunology, Hannover, Germany
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