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Hart M, Walch-Rückheim B, Friedmann KS, Rheinheimer S, Tänzer T, Glombitza B, Sester M, Lenhof HP, Hoth M, Schwarz EC, Keller A, Meese E. miR-34a: a new player in the regulation of T cell function by modulation of NF-κB signaling. Cell Death Dis 2019; 10:46. [PMID: 30718475 PMCID: PMC6362007 DOI: 10.1038/s41419-018-1295-1] [Citation(s) in RCA: 56] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Revised: 12/13/2018] [Accepted: 12/18/2018] [Indexed: 12/15/2022]
Abstract
NF-κB functions as modulator of T cell receptor-mediated signaling and transcriptional regulator of miR-34a. Our in silico analysis revealed that miR-34a impacts the NF-κB signalosome with miR-34a binding sites in 14 key members of the NF-κB signaling pathway. Functional analysis identified five target genes of miR-34a including PLCG1, CD3E, PIK3CB, TAB2, and NFΚBIA. Overexpression of miR-34a in CD4+ and CD8+ T cells led to a significant decrease of NFΚBIA as the most downstream cytoplasmic NF-κB member, a reduced cell surface abundance of TCRA and CD3E, and to a reduction of T cell killing capacity. Inhibition of miR-34a caused an increase of NFΚBIA, TCRA, and CD3E. Notably, activation of CD4+ and CD8+ T cells entrails a gradual increase of miR-34a. Our results lend further support to a model with miR-34a as a central NF-κB regulator in T cells.
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Affiliation(s)
- Martin Hart
- Institute of Human Genetics, Saarland University, 66421, Homburg, Germany.
| | - Barbara Walch-Rückheim
- Institute of Virology and Center of Human and Molecular Biology, Saarland University Medical School, 66421, Homburg, Germany
| | - Kim S Friedmann
- Biophysics, Center for Integrative Physiology and Molecular Medicine, School of Medicine, Saarland University, 66421, Homburg, Germany
| | | | - Tanja Tänzer
- Institute of Virology and Center of Human and Molecular Biology, Saarland University Medical School, 66421, Homburg, Germany
| | - Birgit Glombitza
- Institute of Virology and Center of Human and Molecular Biology, Saarland University Medical School, 66421, Homburg, Germany
| | - Martina Sester
- Department of Transplant and Infection Immunology, Saarland University, 66421, Homburg, Germany
| | - Hans-Peter Lenhof
- Center for Bioinformatics, Saarland University, 66123, Saarbrücken, Germany
| | - Markus Hoth
- Biophysics, Center for Integrative Physiology and Molecular Medicine, School of Medicine, Saarland University, 66421, Homburg, Germany
| | - Eva C Schwarz
- Biophysics, Center for Integrative Physiology and Molecular Medicine, School of Medicine, Saarland University, 66421, Homburg, Germany
| | | | - Eckart Meese
- Institute of Human Genetics, Saarland University, 66421, Homburg, Germany
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Barrera-Vargas A, Gómez-Martín D, Alcocer-Varela J. T cell receptor-associated protein tyrosine kinases: the dynamics of tolerance regulation by phosphorylation and its role in systemic lupus erythematosus. Hum Immunol 2014; 75:945-52. [PMID: 25173412 DOI: 10.1016/j.humimm.2014.08.207] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2014] [Revised: 06/10/2014] [Accepted: 08/21/2014] [Indexed: 01/27/2023]
Abstract
There are different abnormalities that lead to the autoreactive phenotype in T cells from systemic lupus erythematosus (SLE) patients. Proximal signaling, involving the T-cell receptor (TCR) and its associated protein tyrosine kinases (PTKs), is significantly affected in SLE. This ultimately leads to aberrant responses, which include enhanced tyrosine phosphorylation and calcium release, as well as decreased IL-2 secretion. Lck, ZAP70 and Syk, which are PTKs with a major role in proximal signaling, all present abnormal functioning that contributes to an altered T cell response in these patients. A number of other molecules, especially regulatory proteins, are also involved. This review will focus on the PTKs that participate in proximal signaling, with specific emphasis on their relevance in maintaining peripheral tolerance, their abnormalities in SLE and how these contribute to an altered T cell response.
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Affiliation(s)
- Ana Barrera-Vargas
- Department of Immunology and Rheumatology, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Vasco de Quiroga 15, Tlalpan, 14000 Mexico City, Mexico.
| | - Diana Gómez-Martín
- Department of Immunology and Rheumatology, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Vasco de Quiroga 15, Tlalpan, 14000 Mexico City, Mexico.
| | - Jorge Alcocer-Varela
- Department of Immunology and Rheumatology, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Vasco de Quiroga 15, Tlalpan, 14000 Mexico City, Mexico.
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Juvet SC, Thomson CW, Kim EY, Han M, Zhang L. FcRγ controls the fas-dependent regulatory function of lymphoproliferative double negative T cells. PLoS One 2013; 8:e65253. [PMID: 23762329 PMCID: PMC3675138 DOI: 10.1371/journal.pone.0065253] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2013] [Accepted: 04/24/2013] [Indexed: 12/21/2022] Open
Abstract
Patients with autoimmune lymphoproliferative syndrome (ALPS) and lymphoproliferation (LPR) mice are deficient in Fas, and accumulate large numbers of αβ-TCR+, CD4−, CD8− double negative (DN) T cells. The function of these DN T cells remains largely unknown. The common γ subunit of the activating Fc receptors, FcRγ, plays an important role in mediating innate immune responses. We have shown previously that a significant proportion of DN T cells express FcRγ, and that this molecule is required for TCR transgenic DN T cells to suppress allogeneic immune responses. Whether FcRγ plays a critical role in LPR DN T cell-mediated suppression of immune responses to auto and allo-antigens is not known. Here, we demonstrated that FcRγ+, but not FcRγ− LPR DN T cells could suppress Fas+ CD4+ and CD8+ T cell proliferation in vitro and attenuated CD4+ T cell-mediated graft-versus host disease. Although FcRγ expression did not allow LPR DN T cells to inhibit the expansion of Fas-deficient cells within the LPR context, adoptive transfer of FcRγ+, but not FcRγ−, DN T cells inhibited lymphoproliferation in generalized lymphoproliferative disease (GLD) mice. Furthermore, FcRγ acted in a cell-intrinsic fashion to limit DN T cell accumulation by increasing the rate of apoptosis in proliferated cells. These results indicate that FcRγ can confer Fas-dependent regulatory properties on LPR DN T cells, and suggest that FcRγ may be a novel marker for functional DN Tregs.
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Affiliation(s)
- Stephen C. Juvet
- Institute of Medical Science, University of Toronto, Toronto, Ontario, Canada
- Division of Respirology and Toronto Lung Transplant Program, Department of Medicine, University Health Network, University of Toronto, Toronto, Ontario, Canada
- Clinician-Scientist Training Program, Department of Medicine, University of Toronto, Toronto, Ontario, Canada
- Toronto General Research Institute, University Health Network, Toronto, Ontario, Canada
| | - Christopher W. Thomson
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada
- Toronto General Research Institute, University Health Network, Toronto, Ontario, Canada
| | - Edward Y. Kim
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada
- Toronto General Research Institute, University Health Network, Toronto, Ontario, Canada
| | - Mei Han
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada
- Toronto General Research Institute, University Health Network, Toronto, Ontario, Canada
| | - Li Zhang
- Institute of Medical Science, University of Toronto, Toronto, Ontario, Canada
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada
- Department of Immunology, University of Toronto, Toronto, Ontario, Canada
- Toronto General Research Institute, University Health Network, Toronto, Ontario, Canada
- * E-mail:
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4
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Paul S, Schaefer BC. A new look at T cell receptor signaling to nuclear factor-κB. Trends Immunol 2013; 34:269-81. [PMID: 23474202 DOI: 10.1016/j.it.2013.02.002] [Citation(s) in RCA: 96] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2012] [Revised: 01/20/2013] [Accepted: 02/04/2013] [Indexed: 12/20/2022]
Abstract
Antigen stimulation of T cell receptor (TCR) signaling to nuclear factor (NF)-κB is required for T cell proliferation and differentiation of effector cells. The TCR-to-NF-κB pathway is generally viewed as a linear sequence of events in which TCR engagement triggers a cytoplasmic cascade of protein-protein interactions and post-translational modifications, ultimately culminating in the nuclear translocation of NF-κB. However, recent findings suggest a more complex picture in which distinct signalosomes, previously unrecognized proteins, and newly identified regulatory mechanisms play key roles in signal transmission. In this review, we evaluate recent data and suggest areas of future emphasis in the study of this important pathway.
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Affiliation(s)
- Suman Paul
- Department of Microbiology and Immunology, Uniformed Services University, Bethesda, MD 20814, USA
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Olson JC, Wiesner RH. Immunomodulating therapy in liver transplantation: principles and practice. Immunotherapy 2013; 4:793-805. [PMID: 22947008 DOI: 10.2217/imt.12.69] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
Liver transplantation has enjoyed dramatic success as a treatment option for patients suffering from chronic end-stage liver diseases. It also serves as a definitive treatment for certain genetic conditions such as familial amyloidosis and primary oxalosis, and as a potential curative therapy in selected cases of primary liver cancer. Currently, over 50,000 patients are alive with functioning liver transplants. Liver transplantation owes its success to advances in surgical technique, improvements in anesthesia and critical care, and advances in treatment of post-transplant complications including improved therapies for cytomegalovirus infections. But perhaps the most important advances in liver transplantation arise in the context of improvements in our understanding of the molecular biology of transplant immunology and the development of new agents that allow for manipulation of immunological signaling pathways. These improvements in immunosuppressive therapy have dramatically increased both graft and patient survival.
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Affiliation(s)
- Jody C Olson
- Division of Critical Care Medicine, Mayo Clinic, Rochester, MN 55905, USA
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Gurevich M, Gritzman T, Orbach R, Tuller T, Feldman A, Achiron A. Laquinimod suppress antigen presentation in relapsing-remitting multiple sclerosis: in-vitro high-throughput gene expression study. J Neuroimmunol 2010; 221:87-94. [PMID: 20347159 DOI: 10.1016/j.jneuroim.2010.02.010] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2009] [Revised: 02/09/2010] [Accepted: 02/11/2010] [Indexed: 12/22/2022]
Abstract
Laquinimod (LAQ) is a new immunomodulatory drug shown to be effective in the treatment of relapsing-remitting multiple sclerosis (RRMS); however, its molecular target pathways are not well recognized. In this study we characterized in-vitro the molecular effects of LAQ in peripheral blood mononuclear cells (PBMC) of healthy subjects and RRMS patients by gene expression microarrays. We demonstrated that LAQ induced suppression of genes related to antigen presentation and corresponding inflammatory pathways. These findings were demonstrated mainly via the NFkB pathway. Analysis of PBMC subpopulations identified activation of Th2 response in CD14+ and CD4+ cells and suppression of proliferation in CD8+ cells.
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Affiliation(s)
- M Gurevich
- Multiple Sclerosis Center, Sheba Medical Center, Tel-Hashomer, Israel.
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Biochemical signaling pathways for memory T cell recall. Semin Immunol 2009; 21:84-91. [PMID: 19298946 DOI: 10.1016/j.smim.2009.02.003] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/01/2008] [Accepted: 02/04/2009] [Indexed: 10/21/2022]
Abstract
Memory T cells exhibit low activation thresholds and rapid effector responses following antigen stimulation, contrasting naive T cells with high activation thresholds and no effector responses. Signaling mechanisms for the distinct properties of naive and memory T cells remain poorly understood. Here, I will discuss new results on signal transduction in naive and memory T cells that suggest proximal control of activation threshold and a distinct biochemical pathway to rapid recall. The signaling and transcriptional pathways controlling immediate effector function in memory T cells closely resemble pathways for rapid effector cytokine production in innate immune cells, suggesting memory T cells use innate pathways for efficacious responses.
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