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Navarini L, Vomero M, Di Donato S, Currado D, Berardicurti O, Marino A, Bearzi P, Biaggi A, Ferrito M, Ruscitti P, Fava M, Leuti A, Cipriani P, Maccarrone M, Giacomelli R. 2-Arachidonoylglycerol Reduces the Production of Interferon-Gamma in T Lymphocytes from Patients with Systemic Lupus Erythematosus. Biomedicines 2022; 10:biomedicines10071675. [PMID: 35884978 PMCID: PMC9312521 DOI: 10.3390/biomedicines10071675] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2022] [Revised: 06/22/2022] [Accepted: 07/01/2022] [Indexed: 11/16/2022] Open
Abstract
Background: the endocannabinoid 2-arachidonoylglycerol (2-AG) plays a pivotal role in immune cells regulation. The plasma levels of 2-AG are increased in patients with systemic lupus erythematosus (SLE) and correlate with disease activity. Moreover, in plasmacytoid dendritic cells from SLE patients, 2-AG is able to control the production of type 1 interferon (IFN) through CB2 activation. The aim of this study was to evaluate the potential role of 2-AG on T lymphocytes from SLE patients. Methods: peripheral blood mononuclear cells (PBMCs) from SLE participants and age- and sex-matched healthy donors (HD) were isolated by Ficoll–Hypaque density-gradient centrifugation. The PBMCs were treated with increasing concentrations of 2-AG, and AM251 and AM630 were used to antagonize CB1 and CB2, respectively. Flow cytometry was used to assess the expression of CD3, CD4, CD8, CD25, IFN-ɣ, IL-4, and IL-17A. Results: 2-AG (1 μM) decreased IFN-ɣ expression (p = 0.0005) in the Th1 lymphocytes of SLE patients. 2-AG did not modulate the cytokine expression of any other T lymphocyte population from either SLE or HD. Treatment with both 2-AG and AM630 increased the IFN-ɣ expression in Th1 lymphocytes of SLE patients (p = 0.03). Discussion: 2-AG is able to modulate type 2 IFN production from CD4+ T lymphocytes from SLE patients through CB2 activation.
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Affiliation(s)
- Luca Navarini
- Rheumatology, Immunology, and Clinical Medicine Research Unit, Department of Medicine, Campus Bio-Medico University, 00128 Rome, Italy; (M.V.); (S.D.D.); (D.C.); (O.B.); (A.M.); (P.B.); (A.B.); (M.F.); (R.G.)
- Immunorheumatology Unit, Fondazione Policlinico Universitario Campus Bio-Medico, 00128 Roma, Italy
- Correspondence:
| | - Marta Vomero
- Rheumatology, Immunology, and Clinical Medicine Research Unit, Department of Medicine, Campus Bio-Medico University, 00128 Rome, Italy; (M.V.); (S.D.D.); (D.C.); (O.B.); (A.M.); (P.B.); (A.B.); (M.F.); (R.G.)
| | - Stefano Di Donato
- Rheumatology, Immunology, and Clinical Medicine Research Unit, Department of Medicine, Campus Bio-Medico University, 00128 Rome, Italy; (M.V.); (S.D.D.); (D.C.); (O.B.); (A.M.); (P.B.); (A.B.); (M.F.); (R.G.)
| | - Damiano Currado
- Rheumatology, Immunology, and Clinical Medicine Research Unit, Department of Medicine, Campus Bio-Medico University, 00128 Rome, Italy; (M.V.); (S.D.D.); (D.C.); (O.B.); (A.M.); (P.B.); (A.B.); (M.F.); (R.G.)
| | - Onorina Berardicurti
- Rheumatology, Immunology, and Clinical Medicine Research Unit, Department of Medicine, Campus Bio-Medico University, 00128 Rome, Italy; (M.V.); (S.D.D.); (D.C.); (O.B.); (A.M.); (P.B.); (A.B.); (M.F.); (R.G.)
| | - Annalisa Marino
- Rheumatology, Immunology, and Clinical Medicine Research Unit, Department of Medicine, Campus Bio-Medico University, 00128 Rome, Italy; (M.V.); (S.D.D.); (D.C.); (O.B.); (A.M.); (P.B.); (A.B.); (M.F.); (R.G.)
| | - Pietro Bearzi
- Rheumatology, Immunology, and Clinical Medicine Research Unit, Department of Medicine, Campus Bio-Medico University, 00128 Rome, Italy; (M.V.); (S.D.D.); (D.C.); (O.B.); (A.M.); (P.B.); (A.B.); (M.F.); (R.G.)
| | - Alice Biaggi
- Rheumatology, Immunology, and Clinical Medicine Research Unit, Department of Medicine, Campus Bio-Medico University, 00128 Rome, Italy; (M.V.); (S.D.D.); (D.C.); (O.B.); (A.M.); (P.B.); (A.B.); (M.F.); (R.G.)
| | - Matteo Ferrito
- Rheumatology, Immunology, and Clinical Medicine Research Unit, Department of Medicine, Campus Bio-Medico University, 00128 Rome, Italy; (M.V.); (S.D.D.); (D.C.); (O.B.); (A.M.); (P.B.); (A.B.); (M.F.); (R.G.)
- Department of Clinical Sciences and Community Health, Division of Clinical Rheumatology, ASST Istituto Gaetano Pini–CTO, University of Milan, 20122 Milan, Italy
| | - Piero Ruscitti
- Department of Biotechnological and Applied Clinical Sciences, Rheumatology Unit, Università Degli Studi Dell’Aquila, 67100 L’Aquila, Italy; (P.R.); (P.C.)
| | - Marina Fava
- European Center for Brain Research (CERC)/Santa Lucia Foundation IRCCS, 00143 Rome, Italy; (M.F.); (A.L.); (M.M.)
| | - Alessandro Leuti
- European Center for Brain Research (CERC)/Santa Lucia Foundation IRCCS, 00143 Rome, Italy; (M.F.); (A.L.); (M.M.)
- Department of Medicine, Campus Bio-Medico University of Rome, 00128 Rome, Italy
| | - Paola Cipriani
- Department of Biotechnological and Applied Clinical Sciences, Rheumatology Unit, Università Degli Studi Dell’Aquila, 67100 L’Aquila, Italy; (P.R.); (P.C.)
| | - Mauro Maccarrone
- European Center for Brain Research (CERC)/Santa Lucia Foundation IRCCS, 00143 Rome, Italy; (M.F.); (A.L.); (M.M.)
- Department of Biotechnological and Applied Clinical Sciences, University of L’Aquila, 67100 L’Aquila, Italy
| | - Roberto Giacomelli
- Rheumatology, Immunology, and Clinical Medicine Research Unit, Department of Medicine, Campus Bio-Medico University, 00128 Rome, Italy; (M.V.); (S.D.D.); (D.C.); (O.B.); (A.M.); (P.B.); (A.B.); (M.F.); (R.G.)
- Immunorheumatology Unit, Fondazione Policlinico Universitario Campus Bio-Medico, 00128 Roma, Italy
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2
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Yang F, Lin J, Chen W. Post-translational modifications in T cells in systemic erythematosus lupus. Rheumatology (Oxford) 2021; 60:2502-2516. [PMID: 33512488 DOI: 10.1093/rheumatology/keab095] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Revised: 01/21/2021] [Accepted: 01/23/2021] [Indexed: 02/07/2023] Open
Abstract
Systemic erythematosus lupus (SLE) is a classic autoimmune disease characterized by multiple autoantibodies and immune-mediated tissue damage. The aetiology of this disease is still unclear. A new drug, belimumab, which acts against the B-lymphocyte stimulator (BLyS), can effectively improve the condition of SLE patients, but it cannot resolve all SLE symptoms. The discovery of novel, precise therapeutic targets is urgently needed. It is well known that abnormal T-cell function is one of the most crucial factors contributing to the pathogenesis of SLE. Protein post-translational modifications (PTMs), including phosphorylation, glycosylation, acetylation, methylation, ubiquitination and SUMOylation have been emphasized for their roles in activating protein activity, maintaining structural stability, regulating protein-protein interactions and mediating signalling pathways, in addition to other biological functions. Summarizing the latest data in this area, this review focuses on the potential roles of diverse PTMs in regulating T-cell function and signalling pathways in SLE pathogenesis, with the goal of identifying new targets for SLE therapy.
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Affiliation(s)
- Fan Yang
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, Hangzhou, Zhejiang, China
| | - Jin Lin
- Division of Rheumatology, the First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China
| | - Weiqian Chen
- Division of Rheumatology, the First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China
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3
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Crispin JC, Hedrich CM, Suárez-Fueyo A, Comte D, Tsokos GC. SLE-Associated Defects Promote Altered T Cell Function. Crit Rev Immunol 2019; 37:39-58. [PMID: 29431078 DOI: 10.1615/critrevimmunol.2018025213] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Systemic lupus erythematosus (SLE) is a chronic autoimmune disease linked to profound defects in the function and phenotype of T lymphocytes. Here, we describe abnormal signaling pathways that have been documented in T cells from patients with SLE and discuss how they impact gene expression and immune function, in order to understand how they contribute to disease development and progression.
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Affiliation(s)
- Jose C Crispin
- Departamento de Inmunologia y Reumatologia, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
| | - Christian M Hedrich
- Department of Women's & Children's Health, Institute of Translational Medicine, University of Liverpool, Liverpool, UK; Department of Paediatric Rheumatology, Alder Hey Children's NHS Foundation Trust Hospital, Liverpool, UK
| | - Abel Suárez-Fueyo
- Department of Rheumatology, Beth Israel Deaconess Medical Center, Boston, MA, USA; Harvard Medical School, Boston, MA, USA
| | - Denis Comte
- Divisions of Immunology and Allergy, Lausanne University Hospital, Lausanne, Switzerland
| | - George C Tsokos
- Department of Rheumatology, Beth Israel Deaconess Medical Center, Boston, MA, USA; Harvard Medical School, Boston, MA, USA
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Vásquez A, Baena A, González LA, Restrepo M, Muñoz CH, Vanegas-García A, Ortiz-Reyes B, Abdoel N, Rojas M, García LF, Vásquez G. Altered recruitment of Lyn, Syk and ZAP-70 into lipid rafts of activated B cells in Systemic Lupus Erythematosus. Cell Signal 2019; 58:9-19. [PMID: 30840855 DOI: 10.1016/j.cellsig.2019.03.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2018] [Revised: 02/28/2019] [Accepted: 03/01/2019] [Indexed: 12/11/2022]
Abstract
There is evidence that B cells from patients with Systemic Lupus Erythematosus (SLE) could be hyperactivated due to changes in their lipid rafts (LR) composition, leading to altered BCR-dependent signals. This study aimed to characterize possible alterations in the recruitment of protein tyrosine kinases (PTK) into B cells LR from SLE patients. Fifteen patients with SLE and ten healthy controls were included. Circulating B cells were isolated by negative selection and stimulated with goat Fab´2 anti-human IgM/IgG. LR were isolated with a non-ionic detergent and ultracentrifuged on 5-45% discontinuous sucrose gradients. Proteins from each fraction were analyzed by Western Blot. Total levels of Lyn, Syk, and ZAP-70 in resting B cells were similar in SLE patients and healthy controls. Upon BCR activation, Lyn, Syk and ZAP-70 recruitment into LR increased significantly in B cells of healthy controls and patients with inactive SLE. In contrast, in active SLE patients there was a great heterogeneity in the recruitment of signaling molecules and the recruitment of ZAP-70 was mainly observed in patients with decreased Syk recruitment into LR of activated B cells. The reduction in Flotilin-1 and Lyn recruitment in SLE patients seem to be associated with disease activity. These findings suggest that in SLE patients the PTK recruitment into B cell LR is dysregulated and that B cells are under constant activation through BCR signaling. The decrease of Lyn and Syk, the expression of ZAP-70 by B cells and the increase in Calcium fluxes in response to BCR stimulation in active SLE patients, further support that B cells from SLE patients are under constant activation through BCR signaling, as has been proposed.
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Affiliation(s)
- Ana Vásquez
- Grupo de Inmunología Celular e Inmunogenética (GICIG), Sede de investigación Universitaria (SIU), Facultad de Medicina, Universidad de Antioquia, Carrera 53, # 61-30, Medellín, Colombia
| | - Andrés Baena
- Grupo de Inmunología Celular e Inmunogenética (GICIG), Sede de investigación Universitaria (SIU), Facultad de Medicina, Universidad de Antioquia, Carrera 53, # 61-30, Medellín, Colombia
| | - Luis A González
- Grupo de Reumatología, Facultad de Medicina, Universidad de Antioquia, Medellín, Colombia
| | - Mauricio Restrepo
- Grupo de Reumatología, Facultad de Medicina, Universidad de Antioquia, Medellín, Colombia
| | - Carlos H Muñoz
- Grupo de Reumatología, Facultad de Medicina, Universidad de Antioquia, Medellín, Colombia; Sección Reumatología, Hospital Universitario San Vicente Fundación, Medellín, Colombia
| | - Adriana Vanegas-García
- Grupo de Reumatología, Facultad de Medicina, Universidad de Antioquia, Medellín, Colombia; Sección Reumatología, Hospital Universitario San Vicente Fundación, Medellín, Colombia
| | - Blanca Ortiz-Reyes
- Grupo de Inmunología Celular e Inmunogenética (GICIG), Sede de investigación Universitaria (SIU), Facultad de Medicina, Universidad de Antioquia, Carrera 53, # 61-30, Medellín, Colombia
| | - Nursamaa Abdoel
- Centro Nacional de Enfermedades Reumáticas, Hospital Universitario de Caracas, Carcas, Venezuela
| | - Mauricio Rojas
- Grupo de Inmunología Celular e Inmunogenética (GICIG), Sede de investigación Universitaria (SIU), Facultad de Medicina, Universidad de Antioquia, Carrera 53, # 61-30, Medellín, Colombia; Unidad de Citometria, Universidad de Antioquia, Colombia
| | - Luis F García
- Grupo de Inmunología Celular e Inmunogenética (GICIG), Sede de investigación Universitaria (SIU), Facultad de Medicina, Universidad de Antioquia, Carrera 53, # 61-30, Medellín, Colombia
| | - Gloria Vásquez
- Grupo de Inmunología Celular e Inmunogenética (GICIG), Sede de investigación Universitaria (SIU), Facultad de Medicina, Universidad de Antioquia, Carrera 53, # 61-30, Medellín, Colombia; Grupo de Reumatología, Facultad de Medicina, Universidad de Antioquia, Medellín, Colombia.
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Onnis A, Finetti F, Baldari CT. Vesicular Trafficking to the Immune Synapse: How to Assemble Receptor-Tailored Pathways from a Basic Building Set. Front Immunol 2016; 7:50. [PMID: 26913036 PMCID: PMC4753310 DOI: 10.3389/fimmu.2016.00050] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2015] [Accepted: 02/01/2016] [Indexed: 12/20/2022] Open
Abstract
The signals that orchestrate T-cell activation are coordinated within a highly organized interface with the antigen-presenting cell (APC), known as the immune synapse (IS). IS assembly depends on T-cell antigen receptor engagement by a specific peptide antigen-major histocompatibility complex ligand. This primary event leads to polarized trafficking of receptors and signaling mediators associated with recycling endosomes to the cellular interface, which contributes to IS assembly as well as signal termination and favors information transfer from T cells to APCs. Here, we will review recent advances on the vesicular pathways implicated in IS assembly and maintenance, focusing on the spatiotemporal regulation of the traffic of specific receptors by Rab GTPases. Based on accumulating evidence that the IS is a functional homolog of the primary cilium, which coordinates several central signaling pathways in ciliated cells, we will also discuss the similarities in the mechanisms regulating vesicular trafficking to these specialized membrane domains.
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Affiliation(s)
- Anna Onnis
- Department of Life Sciences, University of Siena , Siena , Italy
| | | | - Cosima T Baldari
- Department of Life Sciences, University of Siena , Siena , Italy
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Rother N, van der Vlag J. Disturbed T Cell Signaling and Altered Th17 and Regulatory T Cell Subsets in the Pathogenesis of Systemic Lupus Erythematosus. Front Immunol 2015; 6:610. [PMID: 26648939 PMCID: PMC4663269 DOI: 10.3389/fimmu.2015.00610] [Citation(s) in RCA: 76] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2015] [Accepted: 11/16/2015] [Indexed: 12/11/2022] Open
Abstract
Systemic lupus erythematosus (SLE) is an autoimmune disease characterized by the presence of autoantibodies against nuclear components. Circulating immune complexes of chromatin and autoantibodies deposit in various tissues leading to inflammation and tissue damage. It has been well documented that autoimmunity in SLE depends on autoreactive T cells. In this review, we summarize the literature that addresses the roles of T cell signaling, and Th17 and regulatory T cells (Tregs) in the development of SLE. T cell receptor (TCR) signaling appears to be aberrant in T cells of patients with SLE. In particular, defects in the TCRζ chain, Syk kinase, and calcium signaling molecules have been associated with SLE, which leads to hyperresponsive autoreactive T cells. Furthermore, in patients with SLE increased numbers of autoreactive Th17 cells have been documented, and Th17 cells appear to be responsible for tissue inflammation and damage. In addition, reduced numbers of Tregs as well as Tregs with an impaired regulatory function have been associated with SLE. The altered balance between the number of Tregs and Th17 cells in SLE may result from changes in the cytokine milieu that favors the development of Th17 cells over Tregs.
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Affiliation(s)
- Nils Rother
- Department of Nephrology, Radboud University Medical Center, Radboud Institute of Molecular Life Sciences , Nijmegen , Netherlands
| | - Johan van der Vlag
- Department of Nephrology, Radboud University Medical Center, Radboud Institute of Molecular Life Sciences , Nijmegen , Netherlands
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Sheng W, Liu C, Fu R, Wang H, Qu W, Ruan E, Wang G, Liu H, Wu Y, Song J, Xing L, Guan J, Li L, Liu H, Shao Z. Abnormalities of quantities and functions of linker for activations of T cells in severe aplastic anemia. Eur J Haematol 2014; 93:214-23. [PMID: 24673455 DOI: 10.1111/ejh.12327] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/17/2014] [Indexed: 11/30/2022]
Abstract
OBJECTIVE Severe aplastic anemia (SAA) is a rare immune-regulated disease characterized by severe pancytopenia and bone marrow failure, caused by destruction of hematopoietic cells by the activated T lymphocytes. Linker for activation of T cells (LAT), a transmembrane adaptor protein, plays a key role in T-cell and mast cell functions. However, it remains unclear how LAT may change in patients with SAA. This study aims at understanding the role of lymphocyte LAT in SAA. METHODS The expression of LAT, related signaling molecules, and T-cell effector molecules was determined by flow cytometry. LAT mRNA was evaluated by quantitative real-time PCR. Cytokine production by cultured T cells was determined by ELISA. RESULTS Patients with SAA had an increased levels of LAT and both total phosphorylated LAT and of the related molecule (ZAP-70) in circulating T cells compared with normal controls. In patients with SAA, the expression of LAT was positively associated with the expression of perforin and granzyme B in CD8(+) T cells. Inhibition of LAT expression in T cells from patients with SAA decreased the activation of the CD4(+) and CD8(+) T-cell subsets. Overexpression of LAT in T cells from normal controls increased the activation of CD4(+) and CD8(+) T-cell subsets with increased apoptosis of K562 cells in coculture. CONCLUSIONS Our findings demonstrate that dysregulation of LAT expression and activation may contribute to over-function of T cells, imbalance of Th1/Th2 subsets and thus lead to hematopoiesis failure in SAA. Immunosuppressive therapy dramatically reduced the expression of LAT making it an attractive therapeutic target in SAA.
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Affiliation(s)
- Weiwei Sheng
- The Department of Hematology, The General Hospital of Tianjin Medical University, Tianjin, China
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Kortum RL, Rouquette-Jazdanian AK, Samelson LE. Ras and extracellular signal-regulated kinase signaling in thymocytes and T cells. Trends Immunol 2013; 34:259-68. [PMID: 23506953 DOI: 10.1016/j.it.2013.02.004] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2012] [Revised: 02/04/2013] [Accepted: 02/12/2013] [Indexed: 12/22/2022]
Abstract
Extracellular signal-regulated kinase (ERK) activation is important for both thymocyte development and T cell function. Classically, signal transduction from the T cell antigen receptor (TCR) to ERK is thought to be regulated by signaling from Ras guanine nucleotide exchange factors (GEFs), through the small G protein Ras, to the three-tiered Raf-MAPK/ERK kinase (MEK)-ERK kinase cascade. Developing and mature T cells express four members of two RasGEF families, RasGRP1, RasGRP4, son of sevenless 1 (Sos1), and Sos2, and several models describing combined signaling from these RasGEFs have been proposed. However, recent studies suggest that existing models need revision to include both distinct and overlapping roles of multiple RasGEFs during thymocyte development and novel, Ras-independent signals to ERK that have been identified in peripheral T cells.
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Affiliation(s)
- Robert L Kortum
- Laboratory of Cellular and Molecular Biology, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
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Li CY, Peng J, Ren LP, Gan LX, Lu XJ, Liu Q, Gu W, Guo XJ. Roles of histone hypoacetylation in LAT expression on T cells and Th2 polarization in allergic asthma. J Transl Med 2013; 11:26. [PMID: 23360572 PMCID: PMC3598218 DOI: 10.1186/1479-5876-11-26] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2012] [Accepted: 01/12/2013] [Indexed: 01/09/2023] Open
Abstract
BACKGROUND Linker for activation of T cells (LAT), a transmembrane adaptor protein, plays a role in T cell and mast cell function, while it remains unclear how histone modifications mediate LAT expression in allergic asthma. The present study aimed at understanding alterations of lymphocyte LAT in patients with asthma and potential mechanisms by which histone modulation may be involved in. METHOD The expression of LAT mRNA was checked by Quantitative real-time PCR and histone hypoacetylation on LAT promoter was detected by Chromatin Immunoprecipitation. RESULTS Our results demonstrated that the expression of LAT mRNA in peripheral blood T cells from patients with asthma decreased, as compared to healthy controls. Peripheral blood T cells were treated with pCMV-myc-LAT, pCMV-myc or LAT-siRNA plasmid. Over-expression of LAT mRNA and decrease of Th2 cytokine production were noted, which could be prevented by the inhibition of LAT. The further investigation of the role of histone was performed in an asthma model induced by allergen. Histone hypoacetylation on LAT promoter could inhibit LAT expression and enhanced Th2 differentiation, while trichostatin A, a histone deacetylase inhibitor, promoted LAT expression and inhibited Th2 cytokine production. CONCLUSION Our results indicate that histone hypoacetylation may regulate LAT expression on T cells and modify Th2 polarization in allergic asthma.
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Affiliation(s)
- Cheng-ye Li
- Department of Respiratory Medicine, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, 200092, Shanghai, China
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10
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Kłossowicz M, Scirka B, Suchanek J, Marek-Bukowiec K, Kisielow P, Aguado E, Miazek A. Assessment of caspase mediated degradation of linker for activation of T cells (LAT) at a single cell level. J Immunol Methods 2012; 389:9-17. [PMID: 23261919 DOI: 10.1016/j.jim.2012.12.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2012] [Revised: 12/10/2012] [Accepted: 12/11/2012] [Indexed: 12/29/2022]
Abstract
Caspase/Granzyme B mediated protein degradation is involved in elimination of activated T cell receptor (TCR) signaling molecules during processes of thymocyte selection and maintenance of peripheral homeostasis of T cells. Key components of TCR signaling cassette including LAT undergo biological inactivation in response to pro-apoptotic or anergy inducing environmental stimuli. Although available Western immunoblotting-based techniques are appropriate for detection of protein degradation in bulk populations of target cells, quantitative assessment of this process at a single cell level requires a different approach. Here we report on a novel, flow cytometry-based method for assessment of LAT integrity. This method exploits a loss of an anti-LAT antibody epitope recognition following proteolytic degradation of C-terminal domain of the LAT. We show that the LAT degradation precedes phosphatidylserine translocation to the outer leaflet of the plasma membrane and thus may constitute an early marker of T cell apoptosis. When used in conjunction with multi-parameter flow cytometry, our method revealed that FoxP3(+)CD4(+)CD8(low) thymocytes i.e. precursors of thymus derived CD4(+) regulatory T cells, in contrast to Foxp3(-)CD4(+)CD8(low) thymocytes are resistant to LAT degradation in response to CD3ε crosslinking. This finding can be used as an additional marker for T regulatory cell lineage.
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Affiliation(s)
- Mikołaj Kłossowicz
- Laboratory of Tumor Immunology, Department of Tumor Immunology, Ludwik Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, Wroclaw, Poland
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Perl A. Oxidative stress and endosome recycling are complementary mechanisms reorganizing the T-cell receptor signaling complex in SLE. Clin Immunol 2012; 142:219-22. [PMID: 22245265 PMCID: PMC4048946 DOI: 10.1016/j.clim.2011.12.011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Andras Perl
- Division of Rheumatology, Departments of Medicine, Microbiology and
Immunology, Biochemistry and Molecular Biology, State University of New
York, Upstate Medical University, College of Medicine, Syracuse, New York
13210, USA. State University of New York, College of Medicine 750 East Adams
Street, Syracuse, New York 13210, USA. Fax: +1 315 464 4176
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