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Chen S, Luo K, Bian S, Chen J, Qiu R, Wu X, Li G. Paeonol Ameliorates Abdominal Aortic Aneurysm Progression by the NF-κB Pathway. Ann Vasc Surg 2021; 77:255-262. [PMID: 34411666 DOI: 10.1016/j.avsg.2021.06.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Revised: 06/08/2021] [Accepted: 06/15/2021] [Indexed: 11/16/2022]
Abstract
OBJECTIVE Abdominal aortic aneurysm (AAA) is a chronic inflammatory disease characterized by localized progressive dilatation. Currently, paeonol has been shown to possess anti-inflammatory and protective cardiovascular properties. Our study aimed to investigate the potential influences of paeonol on AAA progression. METHODS Experimental AAAs were created in C57BL/6J mice by intra-aortic infusion of porcine pancreatic elastase, and then intragastrically administered paeonol (20 mg/kg/day) for 14 days. The effects of paeonol on experimental AAA were measured by ultrasound imaging, histopathology, and western blot analyses. RESULTS Paeonol treatment limited the enlargement of the aneurysmal diameter and alleviated the depletion of elastic fibers and vascular smooth muscle cells (VSMCs). Furthermore, the infiltration of CD68+ macrophages and CD8+ lymphocytes was obviously attenuated after paeonol administration, along with mural neoangiogenesis. Western blot results showed that paeonol inhibited the expression of matrix metalloproteinase (MMP) and the NF-κB pathway activation. CONCLUSIONS Paeonol might prevent experimental AAA progression by inhibiting the NF-κB pathway, which suggests that it is a potential drug for AAA.
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MESH Headings
- Acetophenones/pharmacology
- Animals
- Anti-Inflammatory Agents/pharmacology
- Aorta, Abdominal/drug effects
- Aorta, Abdominal/immunology
- Aorta, Abdominal/metabolism
- Aorta, Abdominal/pathology
- Aortic Aneurysm, Abdominal/immunology
- Aortic Aneurysm, Abdominal/metabolism
- Aortic Aneurysm, Abdominal/pathology
- Aortic Aneurysm, Abdominal/prevention & control
- CD8-Positive T-Lymphocytes/drug effects
- CD8-Positive T-Lymphocytes/enzymology
- CD8-Positive T-Lymphocytes/immunology
- Disease Models, Animal
- Disease Progression
- Macrophages/drug effects
- Macrophages/immunology
- Macrophages/metabolism
- Male
- Matrix Metalloproteinase 9/metabolism
- Mice, Inbred C57BL
- NF-kappa B/metabolism
- Neovascularization, Pathologic
- Signal Transduction
- Mice
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Affiliation(s)
- Shuxiao Chen
- Department of Vascular Surgery, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, China
| | - Kun Luo
- Department of Vascular Surgery, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, China
| | - Shuai Bian
- Department of Vascular Surgery, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, China
| | - Jianfeng Chen
- Department of Vascular Surgery, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, China
| | - Renfeng Qiu
- Department of Vascular Surgery, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, China; Department of Vascular Surgery, Shouguang People Hospital, Shouguang, Shandong, China
| | - Xuejun Wu
- Department of Vascular Surgery, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, China; Department of Vascular Surgery, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, China
| | - Gang Li
- Department of Vascular Surgery, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, China; Department of Vascular Surgery, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, China.
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2
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Cannons JL, Villarino AV, Kapnick SM, Preite S, Shih HY, Gomez-Rodriguez J, Kaul Z, Shibata H, Reilley JM, Huang B, Handon R, McBain IT, Gossa S, Wu T, Su HC, McGavern DB, O'Shea JJ, McGuire PJ, Uzel G, Schwartzberg PL. PI3Kδ coordinates transcriptional, chromatin, and metabolic changes to promote effector CD8 + T cells at the expense of central memory. Cell Rep 2021; 37:109804. [PMID: 34644563 PMCID: PMC8582080 DOI: 10.1016/j.celrep.2021.109804] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2020] [Revised: 07/15/2021] [Accepted: 09/16/2021] [Indexed: 01/05/2023] Open
Abstract
Patients with activated phosphatidylinositol 3-kinase delta (PI3Kδ) syndrome (APDS) present with sinopulmonary infections, lymphadenopathy, and cytomegalvirus (CMV) and/or Epstein-Barr virus (EBV) viremia, yet why patients fail to clear certain chronic viral infections remains incompletely understood. Using patient samples and a mouse model (Pik3cdE1020K/+ mice), we demonstrate that, upon activation, Pik3cdE1020K/+ CD8+ T cells exhibit exaggerated features of effector populations both in vitro and after viral infection that are associated with increased Fas-mediated apoptosis due to sustained FoxO1 phosphorylation and Fasl derepression, enhanced mTORC1 and c-Myc signatures, metabolic perturbations, and an altered chromatin landscape. Conversely, Pik3cdE1020K/+ CD8+ cells fail to sustain expression of proteins critical for central memory, including TCF1. Strikingly, activated Pik3cdE1020K/+ CD8+ cells exhibit altered transcriptional and epigenetic circuits characterized by pronounced interleukin-2 (IL-2)/STAT5 signatures and heightened IL-2 responses that prevent differentiation to memory-like cells in IL-15. Our data position PI3Kδ as integrating multiple signaling nodes that promote CD8+ T cell effector differentiation, providing insight into phenotypes of patients with APDS.
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Affiliation(s)
- Jennifer L Cannons
- National Institute of Allergy and Infectious Diseases, NIH, Bethesda, MD 20892, USA; National Human Genome Research Institute, NIH, Bethesda, MD 20892, USA.
| | - Alejandro V Villarino
- National Institute of Arthritis and Musculoskeletal and Skin Diseases, NIH, Bethesda, MD 20892, USA; Department of Microbiology & Immunology and Sylvester Comprehensive Cancer Center, University of Miami, Miami, FL 33136, USA
| | - Senta M Kapnick
- National Human Genome Research Institute, NIH, Bethesda, MD 20892, USA; Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742, USA
| | - Silvia Preite
- National Institute of Allergy and Infectious Diseases, NIH, Bethesda, MD 20892, USA; National Human Genome Research Institute, NIH, Bethesda, MD 20892, USA
| | - Han-Yu Shih
- National Institute of Arthritis and Musculoskeletal and Skin Diseases, NIH, Bethesda, MD 20892, USA; National Eye Institute, NIH, Bethesda, MD 20892, USA
| | - Julio Gomez-Rodriguez
- National Institute of Allergy and Infectious Diseases, NIH, Bethesda, MD 20892, USA; National Human Genome Research Institute, NIH, Bethesda, MD 20892, USA; TCR2 Therapeutics, Cambridge, MA 02142, USA
| | - Zenia Kaul
- National Institute of Allergy and Infectious Diseases, NIH, Bethesda, MD 20892, USA
| | - Hirofumi Shibata
- National Institute of Allergy and Infectious Diseases, NIH, Bethesda, MD 20892, USA
| | - Julie M Reilley
- National Institute of Allergy and Infectious Diseases, NIH, Bethesda, MD 20892, USA; National Human Genome Research Institute, NIH, Bethesda, MD 20892, USA
| | - Bonnie Huang
- National Institute of Allergy and Infectious Diseases, NIH, Bethesda, MD 20892, USA; National Human Genome Research Institute, NIH, Bethesda, MD 20892, USA
| | - Robin Handon
- National Human Genome Research Institute, NIH, Bethesda, MD 20892, USA
| | - Ian T McBain
- National Institute of Allergy and Infectious Diseases, NIH, Bethesda, MD 20892, USA
| | - Selamawit Gossa
- National Institute of Neurological Disorders and Stroke, NIH, Bethesda, MD 20892, USA
| | - Tuoqi Wu
- National Institute of Allergy and Infectious Diseases, NIH, Bethesda, MD 20892, USA; National Human Genome Research Institute, NIH, Bethesda, MD 20892, USA; University of Colorado, Department of Immunology, Denver, CO 80204, USA; Department of Immunology and Harold C. Simmons Comprehensive Cancer Center, UT Southwestern Medical Center, Dallas, TX 75390
| | - Helen C Su
- National Institute of Allergy and Infectious Diseases, NIH, Bethesda, MD 20892, USA
| | - Dorian B McGavern
- National Institute of Neurological Disorders and Stroke, NIH, Bethesda, MD 20892, USA
| | - John J O'Shea
- National Institute of Arthritis and Musculoskeletal and Skin Diseases, NIH, Bethesda, MD 20892, USA
| | - Peter J McGuire
- National Human Genome Research Institute, NIH, Bethesda, MD 20892, USA
| | - Gulbu Uzel
- National Institute of Allergy and Infectious Diseases, NIH, Bethesda, MD 20892, USA
| | - Pamela L Schwartzberg
- National Institute of Allergy and Infectious Diseases, NIH, Bethesda, MD 20892, USA; National Human Genome Research Institute, NIH, Bethesda, MD 20892, USA.
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Zebley CC, Abdelsamed HA, Ghoneim HE, Alli S, Brown C, Haydar D, Mi T, Harris T, McGargill MA, Krenciute G, Youngblood B. Proinflammatory cytokines promote TET2-mediated DNA demethylation during CD8 T cell effector differentiation. Cell Rep 2021; 37:109796. [PMID: 34644568 PMCID: PMC8593824 DOI: 10.1016/j.celrep.2021.109796] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Revised: 07/30/2021] [Accepted: 09/14/2021] [Indexed: 12/24/2022] Open
Abstract
To gain insight into the signaling determinants of effector-associated DNA methylation programming among CD8 T cells, we explore the role of interleukin (IL)-12 in the imprinting of IFNg expression during CD8 T cell priming. We observe that anti-CD3/CD28-mediated stimulation of human naive CD8 T cells is not sufficient to induce substantial demethylation of the IFNg promoter. However, anti-CD3/CD28 stimulation in the presence of the inflammatory cytokine, IL-12, results in stable demethylation of the IFNg locus that is commensurate with IFNg expression. IL-12-associated demethylation of the IFNg locus is coupled to cell division through TET2-dependent demethylation in an ex vivo human chimeric antigen receptor T cell model system and an in vivo immunologically competent murine system. Collectively, these data illustrate that IL-12 signaling promotes TET2-mediated effector DNA demethylation programming in CD8 T cells and serve as proof of concept that cytokines can guide induction of epigenetically regulated traits for T cell-based immunotherapies.
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Affiliation(s)
- Caitlin C Zebley
- Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA; Department of Bone Marrow Transplantation and Cellular Therapy, St. Jude Children's Research Hospital, Memphis, TN 38105, USA; St. Jude Graduate School of Biomedical Sciences, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Hossam A Abdelsamed
- Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Hazem E Ghoneim
- Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Shanta Alli
- Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Charmaine Brown
- Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Dalia Haydar
- Department of Bone Marrow Transplantation and Cellular Therapy, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Tian Mi
- Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Tarsha Harris
- Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Maureen A McGargill
- Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Giedre Krenciute
- Department of Bone Marrow Transplantation and Cellular Therapy, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Ben Youngblood
- Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA.
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4
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Tilly G, Cadoux M, Garcia A, Morille J, Wiertlewski S, Pecqueur C, Brouard S, Laplaud D, Degauque N. Teriflunomide Treatment of Multiple Sclerosis Selectively Modulates CD8 Memory T Cells. Front Immunol 2021; 12:730342. [PMID: 34721394 PMCID: PMC8552527 DOI: 10.3389/fimmu.2021.730342] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2021] [Accepted: 09/10/2021] [Indexed: 11/15/2022] Open
Abstract
Background and Objectives Inhibition of de novo pyrimidine synthesis in proliferating T and B lymphocytes by teriflunomide, a pharmacological inhibitor of dihydroorotate dehydrogenase (DHODH), has been shown to be an effective therapy to treat patients with MS in placebo-controlled phase 3 trials. Nevertheless, the underlying mechanism contributing to the efficacy of DHODH inhibition has been only partially elucidated. Here, we aimed to determine the impact of teriflunomide on the immune compartment in a longitudinal high-dimensional follow-up of patients with relapse-remitting MS (RRMS) treated with teriflunomide. Methods High-dimensional spectral flow cytometry was used to analyze the phenotype and the function of innate and adaptive immune system of patients with RRMS before and 12 months after teriflunomide treatment. In addition, we assessed the impact of teriflunomide on the migration of memory CD8 T cells in patients with RRMS, and we defined patient immune metabolic profiles. Results We found that 12 months of treatment with teriflunomide in patients with RRMS does not affect the B cell or CD4 T cell compartments, including regulatory TREG follicular helper TFH cell and helper TH cell subsets. In contrast, we observed a specific impact of teriflunomide on the CD8 T cell compartment, which was characterized by decreased homeostatic proliferation and reduced production of TNFα and IFNγ. Furthermore, we showed that DHODH inhibition also had a negative impact on the migratory velocity of memory CD8 T cells in patients with RRMS. Finally, we showed that the susceptibility of memory CD8 T cells to DHODH inhibition was not related to impaired metabolism. Discussion Overall, these findings demonstrate that the clinical efficacy of teriflunomide results partially in the specific susceptibility of memory CD8 T cells to DHODH inhibition in patients with RRMS and strengthens active roles for these T cells in the pathophysiological process of MS.
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Affiliation(s)
- Gaëlle Tilly
- Université de Nantes, CHU Nantes, Inserm, Centre de Recherche en Transplantation et Immunologie, UMR 1064, ITUN, Nantes, France
| | - Marion Cadoux
- Université de Nantes, CHU Nantes, Inserm, Centre de Recherche en Transplantation et Immunologie, UMR 1064, ITUN, Nantes, France
| | - Alexandra Garcia
- Université de Nantes, CHU Nantes, Inserm, Centre de Recherche en Transplantation et Immunologie, UMR 1064, ITUN, Nantes, France
| | - Jérémy Morille
- Université de Nantes, CHU Nantes, Inserm, Centre de Recherche en Transplantation et Immunologie, UMR 1064, ITUN, Nantes, France
| | - Sandrine Wiertlewski
- Université de Nantes, CHU Nantes, Inserm, Centre de Recherche en Transplantation et Immunologie, UMR 1064, ITUN, Nantes, France
- CHU Nantes, Service de Neurologie, CRC-SEP, CIC1413, Nantes, France
| | | | - Sophie Brouard
- Université de Nantes, CHU Nantes, Inserm, Centre de Recherche en Transplantation et Immunologie, UMR 1064, ITUN, Nantes, France
| | - David Laplaud
- Université de Nantes, CHU Nantes, Inserm, Centre de Recherche en Transplantation et Immunologie, UMR 1064, ITUN, Nantes, France
- CHU Nantes, Service de Neurologie, CRC-SEP, CIC1413, Nantes, France
| | - Nicolas Degauque
- Université de Nantes, CHU Nantes, Inserm, Centre de Recherche en Transplantation et Immunologie, UMR 1064, ITUN, Nantes, France
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Martínez‐Zamudio RI, Dewald HK, Vasilopoulos T, Gittens‐Williams L, Fitzgerald‐Bocarsly P, Herbig U. Senescence-associated β-galactosidase reveals the abundance of senescent CD8+ T cells in aging humans. Aging Cell 2021; 20:e13344. [PMID: 33939265 PMCID: PMC8135084 DOI: 10.1111/acel.13344] [Citation(s) in RCA: 63] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Revised: 02/18/2021] [Accepted: 02/27/2021] [Indexed: 01/10/2023] Open
Abstract
Aging leads to a progressive functional decline of the immune system, rendering the elderly increasingly susceptible to disease and infection. The degree to which immune cell senescence contributes to this decline remains unclear, however, since markers that label immune cells with classical features of cellular senescence accurately and comprehensively have not been identified. Using a second-generation fluorogenic substrate for β-galactosidase and multi-parameter flow cytometry, we demonstrate here that peripheral blood mononuclear cells (PBMCs) isolated from healthy humans increasingly display cells with high senescence-associated β-galactosidase (SA-βGal) activity with advancing donor age. The greatest age-associated increases were observed in CD8+ T-cell populations, in which the fraction of cells with high SA-βGal activity reached average levels of 64% in donors in their 60s. CD8+ T cells with high SA-βGal activity, but not those with low SA-βGal activity, were found to exhibit features of telomere dysfunction-induced senescence and p16-mediated senescence, were impaired in their ability to proliferate, developed in various T-cell differentiation states, and had a gene expression signature consistent with the senescence state previously observed in human fibroblasts. Based on these results, we propose that senescent CD8+ T cells with classical features of cellular senescence accumulate to levels that are significantly higher than previously reported and additionally provide a simple yet robust method for the isolation and characterization of senescent CD8+ T cells with predictive potential for biological age.
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Affiliation(s)
- Ricardo I. Martínez‐Zamudio
- Center for Cell SignalingRutgers‐New Jersey Medical SchoolRutgers Biomedical and Health SciencesRutgers UniversityNewarkNew JerseyUSA
- Department of Microbiology, Biochemistry, and Molecular GeneticsRutgers‐New Jersey Medical SchoolRutgers Biomedical and Health SciencesRutgers UniversityNewarkNew JerseyUSA
| | - Hannah K. Dewald
- Rutgers School of Graduate StudiesRutgers‐New Jersey Medical SchoolRutgers Biomedical and Health SciencesRutgers UniversityNewarkNew JerseyUSA
- Center for Immunity and InflammationRutgers‐New Jersey Medical SchoolRutgers Biomedical and Health SciencesRutgers UniversityNewarkNew JerseyUSA
- Department of Pathology, Immunology, and Laboratory MedicineRutgers‐New Jersey Medical SchoolRutgers Biomedical and Health SciencesRutgers UniversityNewarkNew JerseyUSA
| | - Themistoklis Vasilopoulos
- Center for Cell SignalingRutgers‐New Jersey Medical SchoolRutgers Biomedical and Health SciencesRutgers UniversityNewarkNew JerseyUSA
- Department of Microbiology, Biochemistry, and Molecular GeneticsRutgers‐New Jersey Medical SchoolRutgers Biomedical and Health SciencesRutgers UniversityNewarkNew JerseyUSA
- Rutgers School of Graduate StudiesRutgers‐New Jersey Medical SchoolRutgers Biomedical and Health SciencesRutgers UniversityNewarkNew JerseyUSA
| | - Lisa Gittens‐Williams
- Department of Obstetrics, Gynecology and Women's HealthRutgers‐New Jersey Medical SchoolRutgers Biomedical and Health SciencesRutgers UniversityNewarkNew JerseyUSA
| | - Patricia Fitzgerald‐Bocarsly
- Center for Immunity and InflammationRutgers‐New Jersey Medical SchoolRutgers Biomedical and Health SciencesRutgers UniversityNewarkNew JerseyUSA
- Department of Pathology, Immunology, and Laboratory MedicineRutgers‐New Jersey Medical SchoolRutgers Biomedical and Health SciencesRutgers UniversityNewarkNew JerseyUSA
| | - Utz Herbig
- Center for Cell SignalingRutgers‐New Jersey Medical SchoolRutgers Biomedical and Health SciencesRutgers UniversityNewarkNew JerseyUSA
- Department of Microbiology, Biochemistry, and Molecular GeneticsRutgers‐New Jersey Medical SchoolRutgers Biomedical and Health SciencesRutgers UniversityNewarkNew JerseyUSA
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Zhang Y, Hu H, Liu W, Yan SM, Li Y, Tan L, Chen Y, Liu J, Peng Z, Yuan Y, Huang W, Yu F, He X, Li B, Zhang H. Amino acids and RagD potentiate mTORC1 activation in CD8 + T cells to confer antitumor immunity. J Immunother Cancer 2021; 9:e002137. [PMID: 33883257 PMCID: PMC8061841 DOI: 10.1136/jitc-2020-002137] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/17/2021] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND In the tumor microenvironment, tumor cells are able to suppress antitumor immunity by competing for essential nutrients, including amino acids. However, whether amino acid depletion modulates the activity of CD8+ tumor-infiltrating lymphocytes (TILs) is unclear. METHOD In this study, we evaluated the roles of amino acids and the Rag complex in regulating mammalian target of rapamycin complex 1 (mTORC1) signaling in CD8+ TILs. RESULTS We discovered that the Rag complex, particularly RagD, was crucial for CD8+ T-cell antitumor immunity. RagD expression was positively correlated with the antitumor response of CD8+ TILs in both murine syngeneic tumor xenografts and clinical human colon cancer samples. On RagD deficiency, CD8+ T cells were rendered more dysfunctional, as demonstrated by attenuation of mTORC1 signaling and reductions in proliferation and cytokine secretion. Amino acids maintained RagD-mediated mTORC1 translocation to the lysosome, thereby achieving maximal mTORC1 activity in CD8+ T cells. Moreover, the limited T-cell access to leucine (LEU), overshadowed by tumor cell amino acid consumption, led to impaired RagD-dependent mTORC1 activity. Finally, combined with antiprogrammed cell death protein 1 antibody, LEU supplementation improved T-cell immunity in MC38 tumor-bearing mice in vivo. CONCLUSION Our results revealed that robust signaling of amino acids by RagD and downstream mTORC1 signaling were crucial for T-cell receptor-initiated antitumor immunity. The characterization the role of RagD and LEU in nutrient mTORC1 signaling in TILs might suggest potential therapeutic strategies based on the manipulation of RagD and its upstream pathway.
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Affiliation(s)
- Yiwen Zhang
- Institute of Human Virology, Key Laboratory of Tropical Disease Control of Ministry of Education, Guangdong Engineering Research Center for Antimicrobial Agent and Immunotechnology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Hongrong Hu
- Department of Biochemistry, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, Guangdong, China
- Sun Yat-sen University Cancer Center, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Weiwei Liu
- Institute of Human Virology, Key Laboratory of Tropical Disease Control of Ministry of Education, Guangdong Engineering Research Center for Antimicrobial Agent and Immunotechnology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Shu-Mei Yan
- Sun Yat-sen University Cancer Center, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Yuzhuang Li
- Institute of Human Virology, Key Laboratory of Tropical Disease Control of Ministry of Education, Guangdong Engineering Research Center for Antimicrobial Agent and Immunotechnology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Likai Tan
- Institute of Immunology, Hannover Medical School, Hannover, Niedersachsen, Germany
| | - Yingshi Chen
- Institute of Human Virology, Key Laboratory of Tropical Disease Control of Ministry of Education, Guangdong Engineering Research Center for Antimicrobial Agent and Immunotechnology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Jun Liu
- School of Medicine, Sun Yat-sen University, Shenzhen, China
| | - Zhilin Peng
- Institute of Human Virology, Key Laboratory of Tropical Disease Control of Ministry of Education, Guangdong Engineering Research Center for Antimicrobial Agent and Immunotechnology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Yaochang Yuan
- Institute of Human Virology, Key Laboratory of Tropical Disease Control of Ministry of Education, Guangdong Engineering Research Center for Antimicrobial Agent and Immunotechnology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Wenjing Huang
- Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong, China
| | - Fei Yu
- Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong, China
| | - Xin He
- Institute of Human Virology, Key Laboratory of Tropical Disease Control of Ministry of Education, Guangdong Engineering Research Center for Antimicrobial Agent and Immunotechnology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Bo Li
- Department of Biochemistry, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Hui Zhang
- Institute of Human Virology, Key Laboratory of Tropical Disease Control of Ministry of Education, Guangdong Engineering Research Center for Antimicrobial Agent and Immunotechnology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, Guangdong, China
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7
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Liu Y, He S, Wang XL, Peng W, Chen QY, Chi DM, Chen JR, Han BW, Lin GW, Li YQ, Wang QY, Peng RJ, Wei PP, Guo X, Li B, Xia X, Mai HQ, Hu XD, Zhang Z, Zeng YX, Bei JX. Tumour heterogeneity and intercellular networks of nasopharyngeal carcinoma at single cell resolution. Nat Commun 2021; 12:741. [PMID: 33531485 PMCID: PMC7854640 DOI: 10.1038/s41467-021-21043-4] [Citation(s) in RCA: 88] [Impact Index Per Article: 29.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Accepted: 01/07/2021] [Indexed: 02/07/2023] Open
Abstract
The heterogeneous nature of tumour microenvironment (TME) underlying diverse treatment responses remains unclear in nasopharyngeal carcinoma (NPC). Here, we profile 176,447 cells from 10 NPC tumour-blood pairs, using single-cell transcriptome coupled with T cell receptor sequencing. Our analyses reveal 53 cell subtypes, including tumour-infiltrating CD8+ T, regulatory T (Treg), and dendritic cells (DCs), as well as malignant cells with different Epstein-Barr virus infection status. Trajectory analyses reveal exhausted CD8+ T and immune-suppressive TNFRSF4+ Treg cells in tumours might derive from peripheral CX3CR1+CD8+ T and naïve Treg cells, respectively. Moreover, we identify immune-regulatory and tolerogenic LAMP3+ DCs. Noteworthily, we observe intensive inter-cell interactions among LAMP3+ DCs, Treg, exhausted CD8+ T, and malignant cells, suggesting potential cross-talks to foster an immune-suppressive niche for the TME. Collectively, our study uncovers the heterogeneity and interacting molecules of the TME in NPC at single-cell resolution, which provide insights into the mechanisms underlying NPC progression and the development of precise therapies for NPC.
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Affiliation(s)
- Yang Liu
- Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Guangzhou, 510060, People's Republic of China
| | - Shuai He
- Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Guangzhou, 510060, People's Republic of China
- The Eighth Affiliated Hospital, Sun Yat-sen University, Shenzhen, 518033, People's Republic of China
- Center for Precision Medicine, Sun Yat-sen University, Guangzhou, 510080, People's Republic of China
| | - Xi-Liang Wang
- BIOPIC, Beijing Advanced Innovation Center for Genomics, School of Life Sciences, Peking University, Beijing, 100871, People's Republic of China
| | - Wan Peng
- Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Guangzhou, 510060, People's Republic of China
| | - Qiu-Yan Chen
- Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Guangzhou, 510060, People's Republic of China
| | - Dong-Mei Chi
- Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Guangzhou, 510060, People's Republic of China
- Department of Anesthesiology, Sun Yat-sen University Cancer Center, Guangzhou, 510060, People's Republic of China
| | - Jie-Rong Chen
- Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Guangzhou, 510060, People's Republic of China
- Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, People's Republic of China
| | - Bo-Wei Han
- Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Guangzhou, 510060, People's Republic of China
| | - Guo-Wang Lin
- Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Guangzhou, 510060, People's Republic of China
- Department of Laboratory Medicine, Zhujiang Hospital, Southern Medical University, Guangzhou, Guangdong, 510282, People's Republic of China
| | - Yi-Qi Li
- Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Guangzhou, 510060, People's Republic of China
| | - Qian-Yu Wang
- Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Guangzhou, 510060, People's Republic of China
| | - Rou-Jun Peng
- Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Guangzhou, 510060, People's Republic of China
| | - Pan-Pan Wei
- Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Guangzhou, 510060, People's Republic of China
| | - Xiang Guo
- Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Guangzhou, 510060, People's Republic of China
| | - Bo Li
- Department of Biochemistry and Molecular Biology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, 510080, People's Republic of China
- RNA Biomedical Institute, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, 510120, People's Republic of China
| | - Xiaojun Xia
- Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Guangzhou, 510060, People's Republic of China
| | - Hai-Qiang Mai
- Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Guangzhou, 510060, People's Republic of China
| | - Xue-Da Hu
- BIOPIC, Beijing Advanced Innovation Center for Genomics, School of Life Sciences, Peking University, Beijing, 100871, People's Republic of China
| | - Zemin Zhang
- BIOPIC, Beijing Advanced Innovation Center for Genomics, School of Life Sciences, Peking University, Beijing, 100871, People's Republic of China.
- Peking-Tsinghua Center for Life Sciences, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing, 100871, People's Republic of China.
| | - Yi-Xin Zeng
- Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Guangzhou, 510060, People's Republic of China.
| | - Jin-Xin Bei
- Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Guangzhou, 510060, People's Republic of China.
- The Eighth Affiliated Hospital, Sun Yat-sen University, Shenzhen, 518033, People's Republic of China.
- Center for Precision Medicine, Sun Yat-sen University, Guangzhou, 510080, People's Republic of China.
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8
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Gu M, Zhou X, Sohn JH, Zhu L, Jie Z, Yang JY, Zheng X, Xie X, Yang J, Shi Y, Brightbill HD, Kim JB, Wang J, Cheng X, Sun SC. NF-κB-inducing kinase maintains T cell metabolic fitness in antitumor immunity. Nat Immunol 2021; 22:193-204. [PMID: 33398181 PMCID: PMC7855506 DOI: 10.1038/s41590-020-00829-6] [Citation(s) in RCA: 49] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Accepted: 10/29/2020] [Indexed: 01/28/2023]
Abstract
Metabolic reprograming toward aerobic glycolysis is a pivotal mechanism shaping immune responses. Here we show that deficiency in NF-κB-inducing kinase (NIK) impairs glycolysis induction, rendering CD8+ effector T cells hypofunctional in the tumor microenvironment. Conversely, ectopic expression of NIK promotes CD8+ T cell metabolism and effector function, thereby profoundly enhancing antitumor immunity and improving the efficacy of T cell adoptive therapy. NIK regulates T cell metabolism via a NF-κB-independent mechanism that involves stabilization of hexokinase 2 (HK2), a rate-limiting enzyme of the glycolytic pathway. NIK prevents autophagic degradation of HK2 through controlling cellular reactive oxygen species levels, which in turn involves modulation of glucose-6-phosphate dehydrogenase (G6PD), an enzyme that mediates production of the antioxidant NADPH. We show that the G6PD-NADPH redox system is important for HK2 stability and metabolism in activated T cells. These findings establish NIK as a pivotal regulator of T cell metabolism and highlight a post-translational mechanism of metabolic regulation.
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MESH Headings
- Animals
- CD8-Positive T-Lymphocytes/enzymology
- CD8-Positive T-Lymphocytes/immunology
- CD8-Positive T-Lymphocytes/transplantation
- Cell Line, Tumor
- Colonic Neoplasms/enzymology
- Colonic Neoplasms/immunology
- Colonic Neoplasms/pathology
- Colonic Neoplasms/therapy
- Cytotoxicity, Immunologic
- Energy Metabolism
- Enzyme Stability
- Female
- Glucosephosphate Dehydrogenase/metabolism
- Glycolysis
- Hexokinase/genetics
- Hexokinase/metabolism
- Immunotherapy, Adoptive
- Lymphocyte Activation
- Lymphocytes, Tumor-Infiltrating/enzymology
- Lymphocytes, Tumor-Infiltrating/immunology
- Lymphocytes, Tumor-Infiltrating/transplantation
- Male
- Melanoma, Experimental/enzymology
- Melanoma, Experimental/immunology
- Melanoma, Experimental/pathology
- Melanoma, Experimental/therapy
- Mice, Inbred C57BL
- Mice, Knockout
- NADP/metabolism
- Phenotype
- Protein Serine-Threonine Kinases/deficiency
- Protein Serine-Threonine Kinases/genetics
- Protein Serine-Threonine Kinases/metabolism
- Reactive Oxygen Species/metabolism
- Signal Transduction
- Tumor Microenvironment
- NF-kappaB-Inducing Kinase
- Mice
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Affiliation(s)
- Meidi Gu
- Department of Immunology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Xiaofei Zhou
- Department of Immunology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Jee Hyung Sohn
- National Creative Research Initiatives Center for Adipose Tissue Remodeling, Department of Biological Sciences, Institute of Molecular Biology and Genetics, Seoul National University, Seoul, Korea
| | - Lele Zhu
- Department of Immunology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Zuliang Jie
- Department of Immunology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Jin-Young Yang
- Department of Immunology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
- Department of Biological Sciences, Pusan National University, Busan, Korea
| | - Xiaofeng Zheng
- Department of Bioinformatics and Computational Biology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Xiaoping Xie
- Department of Immunology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Jie Yang
- Department of Immunology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
- Precision for Medicine, Houston, TX, USA
| | - Yaoyao Shi
- Department of Immunology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Hans D Brightbill
- Department of Immunology, Genentech, Inc., South San Francisco, CA, USA
| | - Jae Bum Kim
- National Creative Research Initiatives Center for Adipose Tissue Remodeling, Department of Biological Sciences, Institute of Molecular Biology and Genetics, Seoul National University, Seoul, Korea
| | - Jing Wang
- Department of Bioinformatics and Computational Biology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Xuhong Cheng
- Department of Immunology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Shao-Cong Sun
- Department of Immunology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.
- MD Anderson Cancer Center UTHealth Graduate School of Biomedical Sciences, Houston, TX, USA.
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9
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Wang X, Zhang D, Higham A, Wolosianka S, Gai X, Zhou L, Petersen H, Pinto-Plata V, Divo M, Silverman EK, Celli B, Singh D, Sun Y, Owen CA. ADAM15 expression is increased in lung CD8 + T cells, macrophages, and bronchial epithelial cells in patients with COPD and is inversely related to airflow obstruction. Respir Res 2020; 21:188. [PMID: 32677970 PMCID: PMC7364636 DOI: 10.1186/s12931-020-01446-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Accepted: 07/07/2020] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND A disintegrin and metalloproteinase domain-15 (ADAM15) is expressed by activated leukocytes, and fibroblasts in vitro. Whether ADAM15 expression is increased in the lungs of COPD patients is not known. METHODS ADAM15 gene expression and/or protein levels were measured in whole lung and bronchoalveolar lavage (BAL) macrophage samples obtained from COPD patients, smokers, and non-smokers. Soluble ADAM15 protein levels were measured in BAL fluid (BALF) and plasma samples from COPD patients and controls. Cells expressing ADAM15 in the lungs were identified using immunostaining. Staining for ADAM15 in different cells in the lungs was related to forced expiratory volume in 1 s (FEV1), ratio of FEV1 to forced vital capacity (FEV1/FVC), and pack-years of smoking history. RESULTS ADAM15 gene expression and/or protein levels were increased in alveolar macrophages and whole lung samples from COPD patients versus smokers and non-smokers. Soluble ADAM15 protein levels were similar in BALF and plasma samples from COPD patients and controls. ADAM15 immunostaining was increased in macrophages, CD8+ T cells, epithelial cells, and airway α-smooth muscle (α-SMA)-positive cells in the lungs of COPD patients. ADAM15 immunostaining in macrophages, CD8+ T cells and bronchial (but not alveolar) epithelial cells was related inversely to FEV1 and FEV1/FVC, but not to pack-years of smoking history. ADAM15 staining levels in airway α-SMA-positive cells was directly related to FEV1/FVC. Over-expressing ADAM15 in THP-1 cells reduced their release of matrix metalloproteinases and CCL2. CONCLUSIONS These results link increased ADAM15 expression especially in lung leukocytes and bronchial epithelial cells to the pathogenesis of COPD.
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Affiliation(s)
- Xiaoyun Wang
- Division of Pulmonary and Critical Care Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, 02115, USA
| | - Duo Zhang
- Program in Clinical and Experimental Therapeutics, Department of Clinical and Administrative Pharmacy, College of Pharmacy, University of Georgia, Augusta, GA, 30901, USA
- Vascular Biology Center, Medical College of Georgia, Augusta University, Augusta, GA, 30912, USA
| | - Andrew Higham
- Medicines Evaluation Unit, University of Manchester, Manchester University NHS Foundation Trust, Manchester, UK
| | - Sophie Wolosianka
- Medicines Evaluation Unit, University of Manchester, Manchester University NHS Foundation Trust, Manchester, UK
| | - Xiaoyan Gai
- Department of Pulmonary and Critical Care Medicine, Peking University Third Hospital, Beijing, China
| | - Lu Zhou
- Department of Pulmonary and Critical Care Medicine, Peking University Third Hospital, Beijing, China
| | - Hans Petersen
- The Lovelace Respiratory Research Institute, Albuquerque, NM, 87108, USA
| | - Victor Pinto-Plata
- Division of Pulmonary and Critical Care Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, 02115, USA
| | - Miguel Divo
- Division of Pulmonary and Critical Care Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, 02115, USA
| | - Edwin K Silverman
- Division of Pulmonary and Critical Care Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, 02115, USA
- Channing Division of Network Medicine, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, 02115, USA
| | - Bartolome Celli
- Division of Pulmonary and Critical Care Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, 02115, USA
| | - Dave Singh
- Medicines Evaluation Unit, University of Manchester, Manchester University NHS Foundation Trust, Manchester, UK
| | - Yongchang Sun
- Department of Pulmonary and Critical Care Medicine, Peking University Third Hospital, Beijing, China
| | - Caroline A Owen
- Division of Pulmonary and Critical Care Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, 02115, USA.
- The Lovelace Respiratory Research Institute, Albuquerque, NM, 87108, USA.
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10
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Kohanbash G, Carrera DA, Shrivastav S, Ahn BJ, Jahan N, Mazor T, Chheda ZS, Downey KM, Watchmaker PB, Beppler C, Warta R, Amankulor NA, Herold-Mende C, Costello JF, Okada H. Isocitrate dehydrogenase mutations suppress STAT1 and CD8+ T cell accumulation in gliomas. J Clin Invest 2017; 127:1425-1437. [PMID: 28319047 DOI: 10.1172/jci90644] [Citation(s) in RCA: 285] [Impact Index Per Article: 40.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2016] [Accepted: 01/19/2017] [Indexed: 01/16/2023] Open
Abstract
Mutations in the isocitrate dehydrogenase genes IDH1 and IDH2 are among the first genetic alterations observed during the development of lower-grade glioma (LGG). LGG-associated IDH mutations confer gain-of-function activity by converting α-ketoglutarate to the oncometabolite R-2-hydroxyglutarate (2HG). Clinical samples and gene expression data from The Cancer Genome Atlas (TCGA) demonstrate reduced expression of cytotoxic T lymphocyte-associated genes and IFN-γ-inducible chemokines, including CXCL10, in IDH-mutated (IDH-MUT) tumors compared with IDH-WT tumors. Given these findings, we have investigated the impact of IDH mutations on the immunological milieu in LGG. In immortalized normal human astrocytes (NHAs) and syngeneic mouse glioma models, the introduction of mutant IDH1 or treatment with 2HG reduced levels of CXCL10, which was associated with decreased production of STAT1, a regulator of CXCL10. Expression of mutant IDH1 also suppressed the accumulation of T cells in tumor sites. Reductions in CXCL10 and T cell accumulation were reversed by IDH-C35, a specific inhibitor of mutant IDH1. Furthermore, IDH-C35 enhanced the efficacy of vaccine immunotherapy in mice bearing IDH-MUT gliomas. Our findings demonstrate a mechanism of immune evasion in IDH-MUT gliomas and suggest that specific inhibitors of mutant IDH may improve the efficacy of immunotherapy in patients with IDH-MUT gliomas.
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11
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Kutty RG, Xin G, Schauder DM, Cossette SM, Bordas M, Cui W, Ramchandran R. Dual Specificity Phosphatase 5 Is Essential for T Cell Survival. PLoS One 2016; 11:e0167246. [PMID: 27936095 PMCID: PMC5147890 DOI: 10.1371/journal.pone.0167246] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2016] [Accepted: 11/10/2016] [Indexed: 12/29/2022] Open
Abstract
The mitogen-activated protein kinase (MAPK) pathway regulates many key cellular processes such as differentiation, apoptosis, and survival. The final proteins in this pathway, ERK1/2, are regulated by dual specificity phosphatase 5 (DUSP5). DUSP5 is a nuclear, inducible phosphatase with high affinity and fidelity for ERK1/2. By regulating the final step in the MAPK signaling cascade, DUSP5 exerts strong regulatory control over a central cellular pathway. Like other DUSPs, DUSP5 plays an important role in immune function. In this study, we have utilized new knockout mouse reagents to explore its function further. We demonstrate that global loss of DUSP5 does not result in any gross phenotypic changes. However, loss of DUSP5 affects memory/effector CD8+ T cell populations in response to acute viral infection. Specifically, Dusp5-/- mice have decreased proportions of short-lived effector cells (SLECs) and increased proportions of memory precursor effector cells (MPECs) in response to infection. Further, we show that this phenotype is T cell intrinsic; a bone marrow chimera model restricting loss of DUSP5 to the CD8+ T cell compartment displays a similar phenotype. Dusp5-/- T cells also display increased proliferation, increased apoptosis, and altered metabolic profiles, suggesting that DUSP5 is a pro-survival protein in T cells.
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Affiliation(s)
- Raman G. Kutty
- Developmental Vascular Biology Program, Division of Neonatology, Department of Pediatrics, Department of Obstetrics and Gynecology, Children’s Research Institute, Medical College of Wisconsin, Milwaukee, Wisconsin, United States of America
- Department of Cell Biology, Neurobiology, and Anatomy, Medical College of Wisconsin, Milwaukee, Wisconsin, United States of America
| | - Gang Xin
- Blood Research Institute, BloodCenter of Wisconsin, 8727 Watertown Plank Road, Milwaukee, Wisconsin, United States of America
| | - David M. Schauder
- Blood Research Institute, BloodCenter of Wisconsin, 8727 Watertown Plank Road, Milwaukee, Wisconsin, United States of America
- Department of Microbiology and Molecular Genetics, Medical College of Wisconsin, Milwaukee, Wisconsin, United States of America
| | - Stephanie M. Cossette
- Developmental Vascular Biology Program, Division of Neonatology, Department of Pediatrics, Department of Obstetrics and Gynecology, Children’s Research Institute, Medical College of Wisconsin, Milwaukee, Wisconsin, United States of America
| | - Michelle Bordas
- Developmental Vascular Biology Program, Division of Neonatology, Department of Pediatrics, Department of Obstetrics and Gynecology, Children’s Research Institute, Medical College of Wisconsin, Milwaukee, Wisconsin, United States of America
| | - Weiguo Cui
- Blood Research Institute, BloodCenter of Wisconsin, 8727 Watertown Plank Road, Milwaukee, Wisconsin, United States of America
- Department of Microbiology and Molecular Genetics, Medical College of Wisconsin, Milwaukee, Wisconsin, United States of America
| | - Ramani Ramchandran
- Developmental Vascular Biology Program, Division of Neonatology, Department of Pediatrics, Department of Obstetrics and Gynecology, Children’s Research Institute, Medical College of Wisconsin, Milwaukee, Wisconsin, United States of America
- * E-mail:
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12
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Wen Z, Shimojima Y, Shirai T, Li Y, Ju J, Yang Z, Tian L, Goronzy JJ, Weyand CM. NADPH oxidase deficiency underlies dysfunction of aged CD8+ Tregs. J Clin Invest 2016; 126:1953-67. [PMID: 27088800 DOI: 10.1172/jci84181] [Citation(s) in RCA: 93] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2015] [Accepted: 02/18/2016] [Indexed: 12/13/2022] Open
Abstract
Immune aging results in progressive loss of both protective immunity and T cell-mediated suppression, thereby conferring susceptibility to a combination of immunodeficiency and chronic inflammatory disease. Here, we determined that older individuals fail to generate immunosuppressive CD8+CCR7+ Tregs, a defect that is even more pronounced in the age-related vasculitic syndrome giant cell arteritis. In young, healthy individuals, CD8+CCR7+ Tregs are localized in T cell zones of secondary lymphoid organs, suppress activation and expansion of CD4 T cells by inhibiting the phosphorylation of membrane-proximal signaling molecules, and effectively inhibit proliferative expansion of CD4 T cells in vitro and in vivo. We identified deficiency of NADPH oxidase 2 (NOX2) as the molecular underpinning of CD8 Treg failure in the older individuals and in patients with giant cell arteritis. CD8 Tregs suppress by releasing exosomes that carry preassembled NOX2 membrane clusters and are taken up by CD4 T cells. Overexpression of NOX2 in aged CD8 Tregs promptly restored suppressive function. Together, our data support NOX2 as a critical component of the suppressive machinery of CD8 Tregs and suggest that repairing NOX2 deficiency in these cells may protect older individuals from tissue-destructive inflammatory disease, such as large-vessel vasculitis.
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13
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Zacca ER, Crespo MI, Acland RP, Roselli E, Núñez NG, Maccioni M, Maletto BA, Pistoresi-Palencia MC, Morón G. Aging Impairs the Ability of Conventional Dendritic Cells to Cross-Prime CD8+ T Cells upon Stimulation with a TLR7 Ligand. PLoS One 2015; 10:e0140672. [PMID: 26474053 PMCID: PMC4608578 DOI: 10.1371/journal.pone.0140672] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2015] [Accepted: 09/29/2015] [Indexed: 12/22/2022] Open
Abstract
The aging process is accompanied by altered immune system functioning and an increased risk of infection. Dendritic cells (DCs) are antigen-presenting cells that play a key role in both adaptive and innate immunity, but how aging affects DCs and their influence on immunity has not been thoroughly established. Here we examined the function of conventional DCs (cDCs) in old mice after TLR7 stimulation, focusing on their ability to cross-prime CD8+ T cells. Using polyU, a synthetic ssRNA analog, as TLR7 ligand and OVA as an antigen (Ag) model, we found that cDCs from old mice have a poor ability to stimulate a CD8+ T cell-mediated cytotoxic response. cDCs from old mice exhibit alterations in Ag-processing machinery and TLR7 activation. Remarkably, CD8α+ cDCs from old mice have an impaired ability to activate naïve CD8+ T cells and, moreover, a lower capacity to mature and to process exogenous Ag. Taken together, our results suggest that immunosenescence impacts cDC function, affecting the activation of naïve CD8+ T cells and the generation of effector cytotoxic T cells.
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Affiliation(s)
- Estefanía R. Zacca
- Centro de Investigaciones en Bioquímica Clínica e Inmunología, Consejo Nacional de Investigaciones Científicas y Técnicas, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba, Argentina
| | - María I. Crespo
- Centro de Investigaciones en Bioquímica Clínica e Inmunología, Consejo Nacional de Investigaciones Científicas y Técnicas, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Rachel P. Acland
- Centro de Investigaciones en Bioquímica Clínica e Inmunología, Consejo Nacional de Investigaciones Científicas y Técnicas, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Emiliano Roselli
- Centro de Investigaciones en Bioquímica Clínica e Inmunología, Consejo Nacional de Investigaciones Científicas y Técnicas, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Nicolás G. Núñez
- Centro de Investigaciones en Bioquímica Clínica e Inmunología, Consejo Nacional de Investigaciones Científicas y Técnicas, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Mariana Maccioni
- Centro de Investigaciones en Bioquímica Clínica e Inmunología, Consejo Nacional de Investigaciones Científicas y Técnicas, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Belkys A. Maletto
- Centro de Investigaciones en Bioquímica Clínica e Inmunología, Consejo Nacional de Investigaciones Científicas y Técnicas, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba, Argentina
| | - María C. Pistoresi-Palencia
- Centro de Investigaciones en Bioquímica Clínica e Inmunología, Consejo Nacional de Investigaciones Científicas y Técnicas, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Gabriel Morón
- Centro de Investigaciones en Bioquímica Clínica e Inmunología, Consejo Nacional de Investigaciones Científicas y Técnicas, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba, Argentina
- * E-mail:
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14
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Olesen R, Vigano S, Rasmussen TA, Søgaard OS, Ouyang Z, Buzon M, Bashirova A, Carrington M, Palmer S, Brinkmann CR, Yu XG, Østergaard L, Tolstrup M, Lichterfeld M. Innate Immune Activity Correlates with CD4 T Cell-Associated HIV-1 DNA Decline during Latency-Reversing Treatment with Panobinostat. J Virol 2015; 89:10176-89. [PMID: 26223643 PMCID: PMC4580197 DOI: 10.1128/jvi.01484-15] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2015] [Accepted: 07/21/2015] [Indexed: 01/09/2023] Open
Abstract
UNLABELLED The pharmaceutical reactivation of dormant HIV-1 proviruses by histone deacetylase inhibitors (HDACi) represents a possible strategy to reduce the reservoir of HIV-1-infected cells in individuals treated with suppressive combination antiretroviral therapy (cART). However, the effects of such latency-reversing agents on the viral reservoir size are likely to be influenced by host immune responses. Here, we analyzed the immune factors associated with changes in proviral HIV-1 DNA levels during treatment with the potent HDACi panobinostat in a human clinical trial involving 15 cART-treated HIV-1-infected patients. We observed that the magnitude, breadth, and cytokine secretion profile of HIV-1-specific CD8 T cell responses were unrelated to changes in HIV-1 DNA levels in CD4 T cells during panobinostat treatment. In contrast, the proportions of CD3(-) CD56(+) total NK cells and CD16(+) CD56(dim) NK cells were inversely correlated with HIV-1 DNA levels throughout the study, and changes in HIV-1 DNA levels during panobinostat treatment were negatively associated with the corresponding changes in CD69(+) NK cells. Decreasing levels of HIV-1 DNA during latency-reversing treatment were also related to the proportions of plasmacytoid dendritic cells, to distinct expression patterns of interferon-stimulated genes, and to the expression of the IL28B CC genotype. Together, these data suggest that innate immune activity can critically modulate the effects of latency-reversing agents on the viral reservoir and may represent a target for future immunotherapeutic interventions in HIV-1 eradication studies. IMPORTANCE Currently available antiretroviral drugs are highly effective in suppressing HIV-1 replication, but the virus persists, despite treatment, in a latent form that does not actively express HIV-1 gene products. One approach to eliminate these cells, colloquially termed the "shock-and-kill" strategy, focuses on the use of latency-reversing agents that induce active viral gene expression in latently infected cells, followed by immune-mediated killing. Panobinostat, a histone deacetylase inhibitor, demonstrated potent activities in reversing HIV-1 latency in a recent pilot clinical trial and reduced HIV-1 DNA levels in a subset of patients. Interestingly, we found that innate immune factors, such as natural killer cells, plasmacytoid dendritic cells, and the expression patterns of interferon-stimulated genes, were most closely linked to a decline in the HIV-1 DNA level during treatment with panobinostat. These data suggest that innate immune activity may play an important role in reducing the residual reservoir of HIV-1-infected cells.
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MESH Headings
- Antigens, CD/genetics
- Antigens, CD/immunology
- Antiretroviral Therapy, Highly Active
- CD4-Positive T-Lymphocytes/drug effects
- CD4-Positive T-Lymphocytes/enzymology
- CD4-Positive T-Lymphocytes/immunology
- CD4-Positive T-Lymphocytes/virology
- CD8-Positive T-Lymphocytes/drug effects
- CD8-Positive T-Lymphocytes/enzymology
- CD8-Positive T-Lymphocytes/immunology
- CD8-Positive T-Lymphocytes/virology
- Cell Count
- DNA, Viral/antagonists & inhibitors
- DNA, Viral/genetics
- DNA, Viral/immunology
- Dendritic Cells/drug effects
- Dendritic Cells/enzymology
- Dendritic Cells/immunology
- Dendritic Cells/virology
- Drug Administration Schedule
- Gene Expression
- Genotype
- HIV Infections/drug therapy
- HIV Infections/enzymology
- HIV Infections/immunology
- HIV Infections/virology
- HIV-1/drug effects
- HIV-1/growth & development
- HIV-1/immunology
- Histone Deacetylase Inhibitors/therapeutic use
- Histone Deacetylases/genetics
- Histone Deacetylases/immunology
- Humans
- Hydroxamic Acids/therapeutic use
- Immunity, Innate/drug effects
- Indoles/therapeutic use
- Interferons
- Interleukins/genetics
- Interleukins/immunology
- Killer Cells, Natural/drug effects
- Killer Cells, Natural/enzymology
- Killer Cells, Natural/immunology
- Killer Cells, Natural/virology
- Panobinostat
- Virus Latency/drug effects
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Affiliation(s)
- Rikke Olesen
- Infectious Disease Division, Aarhus University Hospital, Aarhus, Denmark
| | - Selena Vigano
- Ragon Institute of MGH, MIT, and Harvard, Cambridge, Massachusetts, USA Harvard Medical School, Boston, Massachusetts, USA
| | - Thomas A Rasmussen
- Infectious Disease Division, Aarhus University Hospital, Aarhus, Denmark
| | - Ole S Søgaard
- Infectious Disease Division, Aarhus University Hospital, Aarhus, Denmark
| | - Zhengyu Ouyang
- Ragon Institute of MGH, MIT, and Harvard, Cambridge, Massachusetts, USA
| | - Maria Buzon
- Ragon Institute of MGH, MIT, and Harvard, Cambridge, Massachusetts, USA Harvard Medical School, Boston, Massachusetts, USA
| | - Arman Bashirova
- Cancer and Inflammation Program, Laboratory of Experimental Immunology, Leidos Biomedical Research, Inc., Frederick National Laboratory for Cancer Research, Frederick, Maryland, USA
| | - Mary Carrington
- Cancer and Inflammation Program, Laboratory of Experimental Immunology, Leidos Biomedical Research, Inc., Frederick National Laboratory for Cancer Research, Frederick, Maryland, USA
| | - Sarah Palmer
- Westmead Millennium Institute for Medical Research, University of Sydney, Sydney, Australia
| | | | - Xu G Yu
- Ragon Institute of MGH, MIT, and Harvard, Cambridge, Massachusetts, USA Harvard Medical School, Boston, Massachusetts, USA
| | - Lars Østergaard
- Infectious Disease Division, Aarhus University Hospital, Aarhus, Denmark
| | - Martin Tolstrup
- Infectious Disease Division, Aarhus University Hospital, Aarhus, Denmark
| | - Mathias Lichterfeld
- Ragon Institute of MGH, MIT, and Harvard, Cambridge, Massachusetts, USA Harvard Medical School, Boston, Massachusetts, USA Infectious Disease Division, Massachusetts General Hospital, Boston, Massachusetts, USA Infectious Disease Division, Brigham and Women's Hospital, Boston, Massachusetts, USA
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15
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Lee JE, Walsh MC, Hoehn KL, James DE, Wherry EJ, Choi Y. Acetyl CoA Carboxylase 2 Is Dispensable for CD8+ T Cell Responses. PLoS One 2015; 10:e0137776. [PMID: 26367121 PMCID: PMC4569334 DOI: 10.1371/journal.pone.0137776] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2015] [Accepted: 08/21/2015] [Indexed: 01/17/2023] Open
Abstract
Differentiation of T cells is closely associated with dynamic changes in nutrient and energy metabolism. However, the extent to which specific metabolic pathways and molecular components are determinative of CD8+ T cell fate remains unclear. It has been previously established in various tissues that acetyl CoA carboxylase 2 (ACC2) regulates fatty acid oxidation (FAO) by inhibiting carnitine palmitoyltransferase 1 (CPT1), a rate-limiting enzyme of FAO in mitochondria. Here, we explore the cell-intrinsic role of ACC2 in T cell immunity in response to infections. We report here that ACC2 deficiency results in a marginal increase of cellular FAO in CD8+ T cells, but does not appear to influence antigen-specific effector and memory CD8+ T cell responses during infection with listeria or lymphocytic choriomeningitis virus. These results suggest that ACC2 is dispensable for CD8+ T cell responses.
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Affiliation(s)
- Jang Eun Lee
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, 19104, United States of America
- Institute for Immunology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, 19104, United States of America
| | - Matthew C. Walsh
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, 19104, United States of America
- Institute for Immunology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, 19104, United States of America
| | - Kyle L. Hoehn
- Department of Pharmacology, University of Virginia Health System, Charlottesville, Virginia, 22908, United States of America
| | - David E. James
- Charles Perkins Centre Research and Education Hub, University of Sydney, Sydney, New South Wales, Australia
| | - E. John Wherry
- Department of Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, 19104, United States of America
- Institute for Immunology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, 19104, United States of America
| | - Yongwon Choi
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, 19104, United States of America
- Institute for Immunology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, 19104, United States of America
- * E-mail:
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16
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Silva O, Crocetti J, Humphries LA, Burkhardt JK, Miceli MC. Discs Large Homolog 1 Splice Variants Regulate p38-Dependent and -Independent Effector Functions in CD8+ T Cells. PLoS One 2015; 10:e0133353. [PMID: 26186728 PMCID: PMC4505885 DOI: 10.1371/journal.pone.0133353] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2015] [Accepted: 06/02/2015] [Indexed: 11/22/2022] Open
Abstract
Functionally diverse CD8+ T cells develop in response to antigenic stimulation with differing capacities to couple TCR engagement to downstream signals and functions. However, mechanisms of diversifying TCR signaling are largely uncharacterized. Here we identified two alternative splice variants of scaffold protein Dlg1, Dlg1AB and Dlg1B, that diversify signaling to regulate p38 –dependent and –independent effector functions in CD8+ T cells. Dlg1AB, but not Dlg1B associated with Lck, coupling TCR stimulation to p38 activation and proinflammatory cytokine production. Conversely, both Dlg1AB and Dlg1B mediated p38-independent degranulation. Degranulation depended on a Dlg1 fragment containing an intact Dlg1SH3-domain and required the SH3-ligand WASp. Further, Dlg1 controlled WASp activation by promoting TCR-triggered conformational opening of WASp. Collectively, our data support a model where Dlg1 regulates p38-dependent proinflammatory cytokine production and p38-independent cytotoxic granule release through the utilization of alternative splice variants, providing a mechanism whereby TCR engagement couples downstream signals to unique effector functions in CD8+ T cells.
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Affiliation(s)
- Oscar Silva
- Department of Microbiology, Immunology and Molecular Genetics, University of California Los Angeles, Los Angeles, California, United States of America
| | - Jillian Crocetti
- Molecular Biology Interdepartmental Program, University of California Los Angeles, Los Angeles, California, United States of America
| | - Lisa A. Humphries
- Department of Microbiology, Immunology and Molecular Genetics, University of California Los Angeles, Los Angeles, California, United States of America
| | - Janis K. Burkhardt
- Department of Laboratory Medicine, Children’s Hospital of Philadelphia and University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - M. Carrie Miceli
- Department of Microbiology, Immunology and Molecular Genetics, University of California Los Angeles, Los Angeles, California, United States of America
- * E-mail:
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17
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Kaushal H, Bras-Gonçalves R, Negi NS, Lemesre JL, Papierok G, Salotra P. Role of CD8(+) T cells in protection against Leishmania donovani infection in healed Visceral Leishmaniasis individuals. BMC Infect Dis 2014; 14:653. [PMID: 25471494 PMCID: PMC4258298 DOI: 10.1186/s12879-014-0653-6] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2014] [Accepted: 10/29/2014] [Indexed: 12/23/2022] Open
Abstract
BACKGROUND Majority of individuals with history of visceral leishmaniasis (VL) exhibit strong immunity to re-infection, however, the mechanism of resistance is poorly understood. It is unclear whether CD8(+) T cells contribute to protection against Leishmania donovani infection through cytotoxic activity. The present study aims to evaluate immunological mechanism associated with resistance to the disease in healed VL (HVL) individuals and further, the contribution of CD8(+) T cells in the protective immunity. METHODS Peripheral blood mononuclear cells (PBMCs) from VL, HVL and naive groups were exposed in vitro to total soluble Leishmania antigen (TSLA) from L. donovani. The proliferation index was determined by ELISA based lymphoproliferative assay. Cytokines and granzyme B levels were measured by CBA. Activated T-cell populations were estimated using flow cytometry. RESULTS We observed significantly higher lymphoproliferation, cytokines and granzyme B levels in HVL group compared to naive or VL group. More strikingly, we found a strong association (rs = 0.895, P < 0.0001) between proliferation index (PI) and granzyme B level, with a significant proportion of activated CD8(+) T cells in HVL group. CONCLUSIONS Leishmania immune group (HVL) exhibited durable and strong cellular immune response to TSLA in terms of lymphoproliferation as well as production of Th1 cytokines and granzyme B. Additionally, the elevated level of activated CD8(+) T cells and stimulation of cytotoxic activity through granzyme B production, indicated a possible role of CD8(+) T cells in resistance to L. donovani infection in the HVL group.
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Affiliation(s)
- Himanshu Kaushal
- />National Institute of Pathology (ICMR), Safdarjung Hospital Campus, New Delhi, 110029 India
| | - Rachel Bras-Gonçalves
- />Institut de Recherche pour le Développement, UMR177 IRD/CIRAD “INTERTRYP”, Montpellier, France
| | | | - Jean-Loup Lemesre
- />Institut de Recherche pour le Développement, UMR177 IRD/CIRAD “INTERTRYP”, Montpellier, France
| | | | - Poonam Salotra
- />National Institute of Pathology (ICMR), Safdarjung Hospital Campus, New Delhi, 110029 India
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18
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Zangeneh Z, Golmoghaddam H, Emad M, Erfani N, Doroudchi M. Elevated PD-1 expression and decreased telomerase activity in memory T cells of patients with symptomatic Herpes Zoster infection. Cell Mol Biol (Noisy-le-grand) 2014; 60:13-21. [PMID: 25399082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2014] [Accepted: 11/10/2014] [Indexed: 06/04/2023]
Abstract
We investigated PD-1 levels on VZV-specific CD8+ T-cells of patients with zoster and the effect of PD-1 on the telomerase activity. CD3, CD8, CD137 and PD-1 expressions were analyzed on PBMCs from 9 symptomatic and 5 asymptomatic individuals. The effect of PD-1 blockade at the time of stimulation on the telomerase activity of non-senescent CD57-CD45RO+CD8+CD3+ memory T-cells was evaluated. PD-1 was elevated on CD8+ T-cells in patients. The frequency of PD-1+ and CD137- cells in total CD3+CD8+ T cells of patients was elevated compared to controls. Telomerase activity of non-senescent memory T-cells was lower than that of controls. Blockade of PD-1 at the time of stimulation increased telomerase activity of non-senescent memory T-cells, accompanied by increased CD137 expression. Low telomerase activity of the patients with reactivated zoster could be partially overcome by blocking PD-1 pathway.
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Affiliation(s)
- Z Zangeneh
- Shiraz University of Medical Sciences Student Research Committee, School of Medicine Shiraz Iran
| | - H Golmoghaddam
- Shiraz University of Medical Sciences Memory T cell Laboratory, Department of Immunology, School of Medicine Shiraz Iran
| | - M Emad
- Shiraz University of Medical Sciences Department of Dermatology, School of Medicine Shiraz Iran
| | - N Erfani
- Shiraz University of Medical Sciences Shiraz Institute for Cancer Research, School of Medicine Shiraz Iran
| | - M Doroudchi
- Shiraz University of Medical Sciences Memory T cell Laboratory, Department of Immunology, School of Medicine Shiraz Iran mdoroud@sums.ac.ir
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19
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Berezhnoy A, Castro I, Levay A, Malek TR, Gilboa E. Aptamer-targeted inhibition of mTOR in T cells enhances antitumor immunity. J Clin Invest 2014; 124:188-97. [PMID: 24292708 DOI: 10.1172/jci69856] [Citation(s) in RCA: 101] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2013] [Accepted: 09/19/2013] [Indexed: 01/18/2023] Open
Abstract
Recent studies have underscored the importance of memory T cells in mediating protective immunity against pathogens and cancer. Pharmacological inhibition of regulators that mediate T cell differentiation promotes the differentiation of activated CD8(+) T cells into memory cells. Nonetheless, pharmacological agents have broad targets and can induce undesirable immunosuppressive effects. Here, we tested the hypothesis that aptamer-targeted siRNA inhibition of mTOR complex 1 (mTORC1) function in CD8(+) T cells can enhance their differentiation into memory T cells and potentiate antitumor immunity more effectively than the pharmacologic inhibitor rapamycin. To specifically target activated cells, we conjugated an siRNA targeting the mTORC1 component raptor to an aptamer that binds 4-1BB, a costimulatory molecule that is expressed on CD8(+) T cells following TCR stimulation. We found that systemic administration of the 4-1BB aptamer-raptor siRNA to mice downregulated mTORC1 activity in the majority of CD8(+) T cells, leading to the generation of a potent memory response that exhibited cytotoxic effector functions and enhanced vaccine-induced protective immunity in tumor-bearing mice. In contrast, while treatment with the general mTORC1 inhibitor rapamycin also enhanced antigen-activated CD8(+) T cell persistence, the cytotoxic effector functions of the reactivated memory cells were reduced and the alloreactivity of DCs was diminished. Consistent with the immunological findings, mice treated with rapamycin, but not with 4-1BB aptamer-raptor siRNA, failed to reject a subsequent tumor challenge.
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MESH Headings
- Adaptor Proteins, Signal Transducing/genetics
- Adaptor Proteins, Signal Transducing/metabolism
- Animals
- Aptamers, Nucleotide/genetics
- CD8-Positive T-Lymphocytes/enzymology
- CD8-Positive T-Lymphocytes/immunology
- Cancer Vaccines/immunology
- Cell Proliferation
- Cells, Cultured
- Cytotoxicity, Immunologic
- Female
- Gene Knockdown Techniques
- Immunologic Memory
- Immunotherapy, Adoptive
- Mechanistic Target of Rapamycin Complex 1
- Melanoma, Experimental/immunology
- Melanoma, Experimental/therapy
- Mice
- Mice, Inbred BALB C
- Mice, Inbred C57BL
- Mice, Transgenic
- Multiprotein Complexes/genetics
- Multiprotein Complexes/metabolism
- Neoplasm Transplantation
- RNA, Small Interfering/genetics
- Regulatory-Associated Protein of mTOR
- TOR Serine-Threonine Kinases/genetics
- TOR Serine-Threonine Kinases/metabolism
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20
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Piscianz E, Valencic E, Cuzzoni E, De Iudicibus S, De Lorenzo E, Decorti G, Tommasini A. Fate of lymphocytes after withdrawal of tofacitinib treatment. PLoS One 2014; 9:e85463. [PMID: 24416411 PMCID: PMC3887061 DOI: 10.1371/journal.pone.0085463] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2013] [Accepted: 11/28/2013] [Indexed: 11/20/2022] Open
Abstract
Tofacitinib (Tofa) is an inhibitor of Janus Kinase 3, developed for the treatment of autoimmune diseases and for the prevention of transplant rejection. Due to its selective action on proliferating cells, Tofa can offer a way to block T cell activation, without toxic effects on resting cells. However, few studies have investigated the effects of Tofa on lymphocyte activation in vitro. Our aim was to study the action of Tofa on different lymphocyte subsets after in vitro stimulation and to track the behaviour of treated cells after interruption of the treatment. Peripheral blood lymphocytes were stimulated in vitro with mitogen and treated with two concentrations of Tofa. After a first period in culture, cells were washed and further incubated for an additional time. Lymphocyte subsets, activation phenotype and proliferation were assessed at the different time frames. As expected, Tofa was able to reduce the activation and proliferation of lymphocytes in the first four days of treatment. In addition the drug led to a relative decrease of Natural Killer, B cells and CD8 T cells compared to CD4 T cells. However, treated cells were still viable after the first period in culture and begun to proliferate, strikingly, in a dose dependent manner when the drug was removed from the environment by replacing the culture medium. This novel data does not necessarily predict a similar behaviour in vivo, but can warn about the clinical use of this drug when a discontinuation of treatment with Tofa is considered for any reason.
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Affiliation(s)
- Elisa Piscianz
- Department of Diagnostic Medicine, Institute for Maternal and Child Health – IRCCS “Burlo Garofolo”, Trieste, Italy
- * E-mail:
| | - Erica Valencic
- Department of Diagnostic Medicine, Institute for Maternal and Child Health – IRCCS “Burlo Garofolo”, Trieste, Italy
| | - Eva Cuzzoni
- Department of Medical, Surgical and Health Sciences, University of Trieste, Trieste, Italy
| | - Sara De Iudicibus
- Department of Paediatrics, Institute for Maternal and Child Health – IRCCS “Burlo Garofolo”, Trieste, Italy
| | - Elisa De Lorenzo
- Department of Translational Research, National Cancer Institute CRO-IRCCS, Aviano, Italy
| | - Giuliana Decorti
- Department of Life Sciences, University of Trieste, Trieste, Italy
| | - Alberto Tommasini
- Department of Paediatrics, Institute for Maternal and Child Health – IRCCS “Burlo Garofolo”, Trieste, Italy
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21
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Ooi JH, McDaniel KL, Weaver V, Cantorna MT. Murine CD8+ T cells but not macrophages express the vitamin D 1α-hydroxylase. J Nutr Biochem 2013; 25:58-65. [PMID: 24314866 DOI: 10.1016/j.jnutbio.2013.09.003] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2013] [Revised: 08/22/2013] [Accepted: 09/05/2013] [Indexed: 12/31/2022]
Abstract
The active form of vitamin D, 1,25-dihydroxyvitamin D3 [1,25(OH)2D3] is synthesized by the 1α-hydroxylase, which is encoded by the Cyp27B1 gene. Using transgenic mice that have replaced the Cyp27B1 gene with the bacterial lacZ reporter gene (β-galactosidase), the inflammatory conditions that induce Cyp27B1 in the immune system were probed. A variety of stimuli including lipopolysaccharide, anti-CD3 or PMA/ionomycin were used to stimulate splenocytes and bone marrow derived macrophage in vitro. Only anti-CD3 stimulation resulted in a low induction of β-galactosidase activity in the spleen, indicating that T cells might be a source of Cyp27B1. In vivo, challenge with lipopolysaccharide, α-galactosylceramide, and Listeria monocytogenes failed to induce β-galactosidase activity outside of the kidneys. During more prolonged and severe inflammation there was staining in both the lungs and the gastrointestinal tract for β-galactosidase. Furthermore, wild-type reconstitution of the hematopoietic cell population in Cyp27B1 KO mice protected the mice from experimental colitis. T cell production of Cyp27B1 activity was shown to be from the CD8+ but not the CD4+ T cell population. CD8+ T cells expressed the reporter gene only after 48 h of stimulation. The data is consistent with a model where CD8+ T cells are activated to produce Cyp27B1 and 1,25(OH)2D3 that serves to turn off the local immune response.
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Affiliation(s)
- Jot Hui Ooi
- Center for Molecular Immunology and Infectious Disease, Department of Veterinary and Biomedical Science, The Pennsylvania State University, University Park, PA16802
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22
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Smolders J, Remmerswaal EBM, Schuurman KG, Melief J, van Eden CG, van Lier RAW, Huitinga I, Hamann J. Characteristics of differentiated CD8(+) and CD4 (+) T cells present in the human brain. Acta Neuropathol 2013; 126:525-35. [PMID: 23880787 DOI: 10.1007/s00401-013-1155-0] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2013] [Revised: 06/23/2013] [Accepted: 07/09/2013] [Indexed: 11/24/2022]
Abstract
Immune surveillance of the central nervous system (CNS) by T cells is important to keep CNS-trophic viruses in a latent state, yet our knowledge of the characteristics of CNS-populating T cells is incomplete. We performed a comprehensive, multi-color flow-cytometric analysis of isolated T cells from paired corpus callosum (CC) and peripheral blood (PB) samples of 20 brain donors. Compared to PB, CC T cells, which were mostly located in the perivascular space and sporadically in the parenchyma, were enriched for cells expressing CD8. Both CD4(+) and CD8(+) T cells in the CC had a late-differentiated phenotype, as indicated by lack of expression of CD27 and CD28. The CC contained high numbers of T cells expressing chemokine receptor CX3CR1 and CXCR3 that allow for homing to inflamed endothelium and tissue, but hardly cells expressing the lymph node-homing receptor CCR7. Despite the late-differentiated phenotype, CC T cells had high expression of the IL-7 receptor α-chain CD127 and did not contain the neurotoxic cytolytic enzymes perforin, granzyme A, and granzyme B. We postulate that CNS T cells make up a population of tissue-adapted differentiated cells, which use CX3CR1 and CXCR3 to home into the perivascular space, use IL-7 for maintenance, and lack immediate cytolytic activity, thereby preventing immunopathology in response to low or non-specific stimuli. The presence of these cells in this tightly regulated environment likely enables a fast response to local threats. Our results will enable future detailed exploration of T-cell subsets in the brain involved in neurological diseases.
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Affiliation(s)
- Joost Smolders
- Neuroimmunology Research Group, Netherlands Institute for Neuroscience, Meibergdreef 47, 1105 BA, Amsterdam, The Netherlands
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23
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Sukumar M, Liu J, Ji Y, Subramanian M, Crompton JG, Yu Z, Roychoudhuri R, Palmer DC, Muranski P, Karoly ED, Mohney RP, Klebanoff CA, Lal A, Finkel T, Restifo NP, Gattinoni L. Inhibiting glycolytic metabolism enhances CD8+ T cell memory and antitumor function. J Clin Invest 2013; 123:4479-88. [PMID: 24091329 DOI: 10.1172/jci69589] [Citation(s) in RCA: 652] [Impact Index Per Article: 59.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2013] [Accepted: 07/24/2013] [Indexed: 01/02/2023] Open
Abstract
Naive CD8+ T cells rely upon oxidation of fatty acids as a primary source of energy. After antigen encounter, T cells shift to a glycolytic metabolism to sustain effector function. It is unclear, however, whether changes in glucose metabolism ultimately influence the ability of activated T cells to become long-lived memory cells. We used a fluorescent glucose analog, 2-NBDG, to quantify glucose uptake in activated CD8+ T cells. We found that cells exhibiting limited glucose incorporation had a molecular profile characteristic of memory precursor cells and an increased capacity to enter the memory pool compared with cells taking up high amounts of glucose. Accordingly, enforcing glycolytic metabolism by overexpressing the glycolytic enzyme phosphoglycerate mutase-1 severely impaired the ability of CD8+ T cells to form long-term memory. Conversely, activation of CD8+ T cells in the presence of an inhibitor of glycolysis, 2-deoxyglucose, enhanced the generation of memory cells and antitumor functionality. Our data indicate that augmenting glycolytic flux drives CD8+ T cells toward a terminally differentiated state, while its inhibition preserves the formation of long-lived memory CD8+ T cells. These results have important implications for improving the efficacy of T cell-based therapies against chronic infectious diseases and cancer.
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24
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Carter CRD, Aravind G, Smalle NL, Cole JY, Savic S, Wood PMD. CVID patients with autoimmunity have elevated T cell expression of granzyme B and HLA-DR and reduced levels of Treg cells. J Clin Pathol 2012; 66:146-50. [PMID: 23172556 DOI: 10.1136/jclinpath-2012-201046] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
AIMS Common variable immunodeficiency (CVID) is a primary antibody immunodeficiency with approximately 20% of patients reporting additional autoimmune symptoms. The primary aim of this study was to compare the levels of activated and regulatory T cells (Treg cells) in CVID patients in an attempt to clarify their possible interactions leading to the generation of autoimmunity. METHODS Immunophenotyping of T cells was performed by flow cytometry using a whole blood approach. Surface expression of human leukocyte antigen HLA class II DR and intracellular levels of granzyme B in T cell subsets were assessed; Treg levels were measured using CD4 CD25, FOXp3 and CTLA-4. RESULTS CVID patients had higher levels of granzyme B and HLA-DR on CD8(+) T cells compared with control values (mean of 59% vs 30% and 45% vs 21%, respectively). Patients also had reduced levels of Treg cells compared with control values (con mean=3.24% vs pat=2.54%). Patients with autoimmunity (5/23) had a similar level of T cell activation markers to the rest of the patients but with lower Treg cells (mean of 1.1%) and reduced CD25 and CTLA-4 expression. Patients with autoimmunity had a higher ratio of activated to Treg cells compared with patients with no autoimmune symptoms. CONCLUSIONS These results highlight that reduced levels of Treg cells were associated with elevated levels of activated T cells, suggesting that reduced Treg cells in these patients may have functional consequences in allowing exaggerated T cell responses.
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Affiliation(s)
- Clive R D Carter
- Cellular Immunology Laboratory, Department of Immunology and Transplant Immunology, St James's University Hospital, Leeds, UK.
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25
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Garrod KR, Moreau HD, Garcia Z, Lemaître F, Bouvier I, Albert ML, Bousso P. Dissecting T cell contraction in vivo using a genetically encoded reporter of apoptosis. Cell Rep 2012; 2:1438-47. [PMID: 23159042 DOI: 10.1016/j.celrep.2012.10.015] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2012] [Revised: 10/01/2012] [Accepted: 10/22/2012] [Indexed: 12/11/2022] Open
Abstract
Contraction is a critical phase of immunity whereby the vast majority of effector T cells die by apoptosis, sparing a population of long-lived memory cells. Where, when, and why contraction occurs has been difficult to address directly due in large part to the rapid clearance of apoptotic T cells in vivo. To circumvent this issue, we introduced a genetically encoded reporter for caspase-3 activity into naive T cells to identify cells entering the contraction phase. Using two-photon imaging, we found that caspase-3 activity in T cells was maximal at the peak of the response and was associated with loss of motility followed minutes later by cell death. We demonstrated that contraction is a widespread process occurring uniformly in all organs tested and targeting phenotypically diverse T cells. Importantly, we identified a critical window of time during which antigen encounters act to antagonize T cell apoptosis, supporting a causal link between antigen clearance and T cell contraction. Our results offer insight into a poorly explored phase of immunity and provide a versatile methodology to study apoptosis during the development or function of a variety of immune cells in vivo.
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Affiliation(s)
- Kym R Garrod
- Institut Pasteur, Dynamics of Immune Responses Unit, 75015 Paris, France; INSERM U668, 75015 Paris, France
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Byrne SM, Aucher A, Alyahya S, Elder M, Olson ST, Davis DM, Ashton-Rickardt PG. Cathepsin B controls the persistence of memory CD8+ T lymphocytes. J Immunol 2012; 189:1133-43. [PMID: 22745374 PMCID: PMC3401340 DOI: 10.4049/jimmunol.1003406] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The persistence of memory T lymphocytes confers lifelong protection from pathogens. Memory T cells survive and undergo homeostatic proliferation (HSP) in the absence of Ag, although the cell-intrinsic mechanisms by which cytokines drive the HSP of memory T cells are not well understood. In this study we report that lysosome stability limits the long-term maintenance of memory CD8(+) T cell populations. Serine protease inhibitor (Spi) 2A, an anti-apoptotic cytosolic cathepsin inhibitor, is induced by both IL-15 and IL-7. Mice deficient in Spi2A developed fewer memory phenotype CD44(hi)CD8(+) T cells with age, which underwent reduced HSP in the bone marrow. Spi2A was also required for the maintenance of central memory CD8(+) T cell populations after acute infection with lymphocytic choriomeningitis virus. Spi2A-deficient Ag-specific CD8(+) T cell populations declined more than wild-type competitors after viral infection, and they were eroded further after successive infections. Spi2A protected memory cells from lysosomal breakdown by inhibiting cathepsin B. The impaired maintenance of Spi2A-deficient memory CD8(+) T cells was rescued by concomitant cathepsin B deficiency, demonstrating that cathepsin B was a physiological target of Spi2A in memory CD8(+) T cell survival. Our findings support a model in which protection from lysosomal rupture through cytokine-induced expression of Spi2A determines the long-term persistence of memory CD8(+) T cells.
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Affiliation(s)
- Susan M. Byrne
- Section of Immunobiology, Division of Immunology and Inflammation, Department of Medicine, Faculty of Medicine, Imperial College London, London W12 0NN, UK
- Committee on Immunology, University of Chicago, Chicago, IL 60637, USA
| | - Anne Aucher
- Section of Immunology and Infection, Division of Cell and Molecular Biology, Imperial College London, London SW7 2AZ
| | - Syarifah Alyahya
- Section of Immunobiology, Division of Immunology and Inflammation, Department of Medicine, Faculty of Medicine, Imperial College London, London W12 0NN, UK
| | - Matthew Elder
- Section of Immunobiology, Division of Immunology and Inflammation, Department of Medicine, Faculty of Medicine, Imperial College London, London W12 0NN, UK
| | - Steven T. Olson
- Center for Molecular Biology of Oral Diseases, University of Illinois at Chicago, Chicago, IL 60612, USA
| | - Daniel M. Davis
- Section of Immunology and Infection, Division of Cell and Molecular Biology, Imperial College London, London SW7 2AZ
| | - Philip G. Ashton-Rickardt
- Section of Immunobiology, Division of Immunology and Inflammation, Department of Medicine, Faculty of Medicine, Imperial College London, London W12 0NN, UK
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Checker R, Sandur SK, Sharma D, Patwardhan RS, Jayakumar S, Kohli V, Sethi G, Aggarwal BB, Sainis KB. Potent anti-inflammatory activity of ursolic acid, a triterpenoid antioxidant, is mediated through suppression of NF-κB, AP-1 and NF-AT. PLoS One 2012; 7:e31318. [PMID: 22363615 PMCID: PMC3282718 DOI: 10.1371/journal.pone.0031318] [Citation(s) in RCA: 170] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2011] [Accepted: 01/05/2012] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Ursolic acid (UA), a pentacyclic triterpenoid carboxylic acid, is the major component of many plants including apples, basil, cranberries, peppermint, rosemary, oregano and prunes and has been reported to possess antioxidant and anti-tumor properties. These properties of UA have been attributed to its ability to suppress NF-κB (nuclear factor kappa B) activation. Since NF-κB, in co-ordination with NF-AT (nuclear factor of activated T cells) and AP-1(activator protein-1), is known to regulate inflammatory genes, we hypothesized that UA might exhibit potent anti-inflammatory effects. METHODOLOGY/PRINCIPAL FINDINGS The anti-inflammatory effects of UA were assessed in activated T cells, B cells and macrophages. Effects of UA on ERK, JNK, NF-κB, AP-1 and NF-AT were studied to elucidate its mechanism of action. In vivo efficacy of UA was studied using mouse model of graft-versus-host disease. UA inhibited activation, proliferation and cytokine secretion in T cells, B cells and macrophages. UA inhibited mitogen-induced up-regulation of activation markers and co-stimulatory molecules in T and B cells. It inhibited mitogen-induced phosphorylation of ERK and JNK and suppressed the activation of immunoregulatory transcription factors NF-κB, NF-AT and AP-1 in lymphocytes. Treatment of cells with UA prior to allogenic transplantation significantly delayed induction of acute graft-versus-host disease in mice and also significantly reduced the serum levels of pro-inflammatory cytokines IL-6 and IFN-γ. UA treatment inhibited T cell activation even when added post-mitogenic stimulation demonstrating its therapeutic utility as an anti-inflammatory agent. CONCLUSIONS/SIGNIFICANCE The present study describes the detailed mechanism of anti-inflammatory activity of UA. Further, UA may find application in the treatment of inflammatory disorders.
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Affiliation(s)
- Rahul Checker
- Radiation Biology and Health Sciences Division, Bio-Medical Group, Bhabha Atomic Research Centre, Mumbai, India
| | - Santosh K. Sandur
- Radiation Biology and Health Sciences Division, Bio-Medical Group, Bhabha Atomic Research Centre, Mumbai, India
| | - Deepak Sharma
- Radiation Biology and Health Sciences Division, Bio-Medical Group, Bhabha Atomic Research Centre, Mumbai, India
| | - Raghavendra S. Patwardhan
- Radiation Biology and Health Sciences Division, Bio-Medical Group, Bhabha Atomic Research Centre, Mumbai, India
| | - S. Jayakumar
- Radiation Biology and Health Sciences Division, Bio-Medical Group, Bhabha Atomic Research Centre, Mumbai, India
| | - Vineet Kohli
- Medical Division, Bio-Medical Group, Bhabha Atomic Research Centre, Mumbai, India
| | - Gautam Sethi
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Bharat B. Aggarwal
- Cytokine Research Laboratory, Department of Experimental Therapeutics, The University of Texas M.D. Anderson Cancer Center, Houston, Texas, United States of America
| | - Krishna B. Sainis
- Radiation Biology and Health Sciences Division, Bio-Medical Group, Bhabha Atomic Research Centre, Mumbai, India
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28
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Abstract
The serine protease granzyme B (GrB) is a key effector molecule in cell-mediated immunity, released by cytotoxic lymphocytes (CLs) to induce cell death in neoplastic or virus-infected cells. The ability to detect and measure GrB activity is important for understanding CLs. Unfortunately, such analyses are complicated by significant differences in the substrate specificities of human and mouse GrB, which is reflected by their different activities on commonly used peptide substrates. Here, we present methods for the detection of active human and mouse GrB in extracts from primary cells, and evaluate the sensitivity of the various substrates and inhibitors. Mouse splenocytes produce approximately 120-fold more GrB than similarly activated human cells, which allows the use of the hGrB substrate IETD-AFC to follow mouse GrB activity despite its unfavourable kinetic properties.
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Affiliation(s)
- Sarah Elizabeth Stewart
- Department of Biochemistry and Molecular Biology, School of Biomedical Sciences, Monash University, Clayton, VIC, Australia
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29
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Mumm JB, Emmerich J, Zhang X, Chan I, Wu L, Mauze S, Blaisdell S, Basham B, Dai J, Grein J, Sheppard C, Hong K, Cutler C, Turner S, LaFace D, Kleinschek M, Judo M, Ayanoglu G, Langowski J, Gu D, Paporello B, Murphy E, Sriram V, Naravula S, Desai B, Medicherla S, Seghezzi W, McClanahan T, Cannon-Carlson S, Beebe AM, Oft M. IL-10 elicits IFNγ-dependent tumor immune surveillance. Cancer Cell 2011; 20:781-96. [PMID: 22172723 DOI: 10.1016/j.ccr.2011.11.003] [Citation(s) in RCA: 296] [Impact Index Per Article: 22.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/01/2011] [Revised: 07/18/2011] [Accepted: 11/02/2011] [Indexed: 12/19/2022]
Abstract
Tumor immune surveillance and cancer immunotherapies are thought to depend on the intratumoral infiltration of activated CD8(+) T cells. Intratumoral CD8(+) T cells are rare and lack activity. IL-10 is thought to contribute to the underlying immune suppressive microenvironment. Defying those expectations we demonstrate that IL-10 induces several essential mechanisms for effective antitumor immune surveillance: infiltration and activation of intratumoral tumor-specific cytotoxic CD8(+) T cells, expression of the Th1 cytokine interferon-γ (IFNγ) and granzymes in CD8(+) T cells, and intratumoral antigen presentation molecules. Consequently, tumor immune surveillance is weakened in mice deficient for IL-10 whereas transgenic overexpression of IL-10 protects mice from carcinogenesis. Treatment with pegylated IL-10 restores tumor-specific intratumoral CD8(+) T cell function and controls tumor growth.
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MESH Headings
- Animals
- Antineoplastic Agents/pharmacology
- Antineoplastic Agents/therapeutic use
- Breast Neoplasms/metabolism
- CD8-Positive T-Lymphocytes/enzymology
- CD8-Positive T-Lymphocytes/metabolism
- Cell Line, Tumor
- Cytotoxicity, Immunologic
- Female
- Granzymes/metabolism
- Humans
- Interferon-gamma/genetics
- Interferon-gamma/metabolism
- Interleukin-10/genetics
- Interleukin-10/immunology
- Interleukin-10/metabolism
- Interleukin-10 Receptor alpha Subunit/genetics
- Interleukin-10 Receptor alpha Subunit/metabolism
- Mammary Neoplasms, Experimental/blood supply
- Mammary Neoplasms, Experimental/drug therapy
- Mammary Neoplasms, Experimental/pathology
- Mice
- Mice, Inbred BALB C
- Mice, Inbred C57BL
- Mice, Transgenic
- Neoplasm Transplantation
- Neoplasms, Experimental/drug therapy
- Neoplasms, Experimental/immunology
- Neoplasms, Experimental/pathology
- Perforin/metabolism
- Skin Neoplasms/chemically induced
- Skin Neoplasms/immunology
- Skin Neoplasms/pathology
- Spleen/metabolism
- Transplantation, Heterologous
- Tumor Burden
- Tumor Escape
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Affiliation(s)
- John B Mumm
- Merck Research Labs, Palo Alto, CA 94301, USA
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30
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Fu G, Hu J, Niederberger-Magnenat N, Rybakin V, Casas J, Yachi PP, Feldstein S, Ma B, Hoerter JAH, Ampudia J, Rigaud S, Lambolez F, Gavin AL, Sauer K, Cheroutre H, Gascoigne NRJ. Protein kinase C η is required for T cell activation and homeostatic proliferation. Sci Signal 2011; 4:ra84. [PMID: 22155788 PMCID: PMC3242502 DOI: 10.1126/scisignal.2002058] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Protein kinase C η (PKCη) is abundant in T cells and is recruited to the immunological synapse that is formed between a T cell and an antigen-presenting cell; however, its function in T cells is unknown. We showed that PKCη was required for the activation of mature CD8+ T cells through the T cell receptor. Compared with wild-type T cells, PKCη-/- T cells showed poor proliferation in response to antigen stimulation, a trait shared with T cells deficient in PKCθ, which is the most abundant PKC isoform in T cells and was thought to be the only PKC isoform with a specific role in T cell activation. In contrast, only PKCη-deficient T cells showed defective homeostatic proliferation, which requires self-antigen recognition. PKCη was dispensable for thymocyte development; however, thymocytes from mice doubly deficient in PKCη and PKCθ exhibited poor development, indicating some redundancy between the PKC isoforms. Deficiency in PKCη or PKCθ had opposing effects on the relative numbers of CD4+ and CD8+ T cells. PKCη-/- mice had a higher ratio of CD4+ to CD8+ T cells compared to that of wild-type mice, whereas PKCθ-/- mice had a lower ratio. Mice deficient in both isoforms exhibited normal cell ratios. Together, these data suggest that PKCη shares some redundant roles with PKCθ in T cell biology and also performs nonredundant functions that are required for T cell homeostasis and activation.
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Affiliation(s)
- Guo Fu
- Department of Immunology and Microbial Science, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Jianfang Hu
- Department of Immunology and Microbial Science, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Nathalie Niederberger-Magnenat
- Department of Immunology and Microbial Science, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
- Department of Developmental Immunology, La Jolla Institute for Allergy and Immunology, 9420 Athena Circle, La Jolla, CA 92037, USA
| | - Vasily Rybakin
- Department of Immunology and Microbial Science, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Javier Casas
- Department of Immunology and Microbial Science, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Pia P. Yachi
- Department of Immunology and Microbial Science, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Stephanie Feldstein
- Department of Immunology and Microbial Science, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Bo Ma
- Department of Molecular and Experimental Medicine, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - John A. H. Hoerter
- Department of Immunology and Microbial Science, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Jeanette Ampudia
- Department of Immunology and Microbial Science, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Stephanie Rigaud
- Department of Immunology and Microbial Science, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Florence Lambolez
- Department of Developmental Immunology, La Jolla Institute for Allergy and Immunology, 9420 Athena Circle, La Jolla, CA 92037, USA
| | - Amanda L. Gavin
- Department of Immunology and Microbial Science, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Karsten Sauer
- Department of Immunology and Microbial Science, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Hilde Cheroutre
- Department of Developmental Immunology, La Jolla Institute for Allergy and Immunology, 9420 Athena Circle, La Jolla, CA 92037, USA
| | - Nicholas R. J. Gascoigne
- Department of Immunology and Microbial Science, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
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31
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Zambon AC, Wilderman A, Ho A, Insel PA. Increased expression of the pro-apoptotic protein BIM, a mechanism for cAMP/protein kinase A (PKA)-induced apoptosis of immature T cells. J Biol Chem 2011; 286:33260-7. [PMID: 21808067 PMCID: PMC3190928 DOI: 10.1074/jbc.m111.268979] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2011] [Revised: 07/15/2011] [Indexed: 01/09/2023] Open
Abstract
The second messenger cAMP is proapoptotic for numerous cell types, but the mechanism for this proapoptotic action is not defined. Here, we use murine CD4(+)/CD8(+) S49 lymphoma cells and isolated thymocytes to assess this mechanism. In WT S49 cells, cAMP acts via protein kinase A (PKA) to induce G(1) phase cell cycle arrest and apoptosis. Treatment of WT and cAMP-Deathless (D-) S49 cells, which lack cAMP-promoted apoptosis, with the PKA agonist 8-(4-chlorophenylthio)-cAMP (CPT-cAMP) differentially regulates transcripts for numerous proapoptotic and antiapoptotic proteins. In contrast, kin-S49 cells (which lack PKA) show no cAMP-promoted changes in transcript expression. In this study, we use knockdown and overexpression approaches to define the role in cAMP/PKA-promoted apoptosis of the proapoptotic factor BIM (Bcl-2 interacting mediator of cell death), whose expression prominently increases in response to CPT-cAMP treatment of WT but not D- or kin- S49 cells. Conditional expression of BimL, one of the three major forms of Bim, increases apoptosis of WT, D-, and kin-S49 cells, whereas inhibition of cAMP-mediated induction of Bim isoforms by shRNAi attenuates CPT-cAMP-mediated apoptosis of WT S49 cells. Bim protein levels increase in subpopulations of CPT-cAMP-treated cells that undergo apoptosis. Thymic CD4(+)/CD8(+) cells isolated from Bim(-/-) mice corroborated the requirement of Bim expression for cAMP-promoted apoptosis. Thus, up-regulation of Bim appears to be an important determinant of cAMP/PKA-mediated apoptosis in immature T cells and may be a mechanism for such apoptosis in other cell types as well.
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Affiliation(s)
- Alexander C Zambon
- Department of Pharmacology, University of California San Diego, La Jolla, California 92093, USA.
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32
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Veillette A, Bookman MA, Horak EM, Bolen JB. Pillars article: the CD4 and CD8 T cell surface antigens are associated with the internal membrane tyrosine-protein kinase p56lck. 1994. J Immunol 2010; 185:2650-2657. [PMID: 20724731] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
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33
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López-Campos JL, Rodríguez-Rodríguez D, Rodríguez-Becerra E, Alfageme-Michavila I, Fernández-Guerra J, García-Hernández FJ, Casanova A, Fernández de Córdoba J, Romero-Ortiz A, Arellano-Orden E, Montes-Worboys A. [Cyclooxygenase-2 polymorphisms and bronchoalveolar lavage cellularity of sarcoidosis]. Rev Invest Clin 2010; 62:440-446. [PMID: 21416732] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
OBJECTIVES Recent studies have found cyclooxygenase-2 (COX-2) and its polymorphisms to be associated with sarcoidosis, being it significantly decreased in alveolar macrophages, with no information on the relationship between these polymorphisms and the rest of cells in bronchoalveolar layage (BAL). The present study aimed to investigate the potential association between COX-2 gene polymorphisms and the BAL cell profile including the CD4/CD8 ratio. MATERIAL AND METHODS This observational cross-sectional study involved six hospitals in Spain. Patients diagnosed with sarcoidosis with a BAL performed were included. The following variables were recorded: age, gender, initial diagnostic methods, serum angiotensin-converting enzyme levels, pulmonary function tests, radiological stage, and the cellularity and CD4/CD8 ratio from BAL. Genotyping of four COX-2 polymorphisms (COX2.5909T>G, COX2.8473T>C, COX2.926G>C, and COX2.3050G>C) was undertaken on DNA extracted from peripheral blood lymphocytes using fluorescent hybridization probes. The relationship between the polymorphisms and the cellularity was done by means of a multiple linear regression, adjusting for gender. RESULTS A total of 51 sarcoid patients (23 males, mean age: 45 +/- 15 years) were studied. CD4/CD8 ratio was significantly higher among homozygote allele C carriers of the polymorphism COX2.8473T>C (CC 11.2 +/- 5.5 vs. CT+TT 4.4 +/- 3.5; p = 0.022; beta = 7.43; 95% CI 1.38 - 13.48). Although several differences were observed in other cell groups, they did not reach the statistical significance level. CONCLUSIONS In patients diagnosed with sarcoidosis, there seems to be a relationship between COX2.8473 polymorphism and CD4/CD8 ratio from BAL.
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Affiliation(s)
- José Luis López-Campos
- Unidad Médico-Quirúirgica de Enfermedades Respiratorias, Hospital Universitario Virgen del Rocío, Sevilla, España.
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34
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Migueles SA, Osborne CM, Royce C, Compton AA, Joshi RP, Weeks KA, Rood JE, Berkley AM, Sacha JB, Cogliano-Shutta NA, Lloyd M, Roby G, Kwan R, McLaughlin M, Stallings S, Rehm C, O'Shea MA, Mican J, Packard BZ, Komoriya A, Palmer S, Wiegand AP, Maldarelli F, Coffin JM, Mellors JW, Hallahan CW, Follman DA, Connors M. Lytic granule loading of CD8+ T cells is required for HIV-infected cell elimination associated with immune control. Immunity 2008; 29:1009-21. [PMID: 19062316 DOI: 10.1016/j.immuni.2008.10.010] [Citation(s) in RCA: 433] [Impact Index Per Article: 27.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2008] [Revised: 09/19/2008] [Accepted: 10/10/2008] [Indexed: 01/19/2023]
Abstract
Virus-specific CD8+ T cells probably mediate control over HIV replication in rare individuals, termed long-term nonprogressors (LTNPs) or elite controllers. Despite extensive investigation, the mechanisms responsible for this control remain incompletely understood. We observed that HIV-specific CD8+ T cells of LTNPs persisted at higher frequencies than those of treated progressors with equally low amounts of HIV. Measured on a per-cell basis, HIV-specific CD8+ T cells of LTNPs efficiently eliminated primary autologous HIV-infected CD4+ T cells. This function required lytic granule loading of effectors and delivery of granzyme B to target cells. Defective cytotoxicity of progressor effectors could be restored after treatment with phorbol ester and calcium ionophore. These results establish an effector function and mechanism that clearly segregate with immunologic control of HIV. They also demonstrate that lytic granule contents of memory cells are a critical determinant of cytotoxicity that must be induced for maximal per-cell killing capacity.
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Affiliation(s)
- Stephen A Migueles
- National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA
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35
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Kedzierska K, Thomas PG, Venturi V, Davenport MP, Doherty PC, Turner SJ, La Gruta NL. Terminal deoxynucleotidyltransferase is required for the establishment of private virus-specific CD8+ TCR repertoires and facilitates optimal CTL responses. J Immunol 2008; 181:2556-62. [PMID: 18684946 PMCID: PMC2596983 DOI: 10.4049/jimmunol.181.4.2556] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Virus-immune CD8(+) TCR repertoires specific for particular peptide-MHC class I complexes may be substantially shared between (public), or unique to, individuals (private). Because public TCRs can show reduced TdT-mediated N-region additions, we analyzed how TdT shapes the heavily public (to D(b)NP(366)) and essentially private (to D(b)PA(224)) CTL repertoires generated following influenza A virus infection of C57BL/6 (B6, H2(b)) mice. The D(b)NP(366)-specific CTL response was virtually clonal in TdT(-/-) B6 animals, with one of the three public clonotypes prominent in the wild-type (wt) response consistently dominating the TdT(-/-) set. Furthermore, this massive narrowing of TCR selection for D(b)NP(366) reduced the magnitude of D(b)NP(366)-specific CTL response in the virus-infected lung. Conversely, the D(b)PA(224)-specific responses remained comparable in both magnitude and TCR diversity within individual TdT(-/-) and wt mice. However, the extent of TCR diversity across the total population was significantly reduced, with the consequence that the normally private wt D(b)PA(224)-specific repertoire was now substantially public across the TdT(-/-) mouse population. The key finding is thus that the role of TdT in ensuring enhanced diversity and the selection of private TCR repertoires promotes optimal CD8(+) T cell immunity, both within individuals and across the species as a whole.
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MESH Headings
- Animals
- CD8-Positive T-Lymphocytes/enzymology
- CD8-Positive T-Lymphocytes/immunology
- CD8-Positive T-Lymphocytes/virology
- Clone Cells
- Cytotoxicity, Immunologic/genetics
- DNA Nucleotidylexotransferase/deficiency
- DNA Nucleotidylexotransferase/genetics
- DNA Nucleotidylexotransferase/physiology
- Epitopes, T-Lymphocyte/biosynthesis
- Epitopes, T-Lymphocyte/immunology
- Female
- Gene Rearrangement, beta-Chain T-Cell Antigen Receptor
- Influenza A Virus, H3N2 Subtype/immunology
- Mice
- Mice, Inbred C57BL
- Mice, Knockout
- Orthomyxoviridae Infections/enzymology
- Orthomyxoviridae Infections/immunology
- Orthomyxoviridae Infections/metabolism
- Receptors, Antigen, T-Cell, alpha-beta/biosynthesis
- Receptors, Antigen, T-Cell, alpha-beta/genetics
- T-Lymphocytes, Cytotoxic/enzymology
- T-Lymphocytes, Cytotoxic/immunology
- T-Lymphocytes, Cytotoxic/virology
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Affiliation(s)
- Katherine Kedzierska
- Department of Microbiology and Immunology, University of Melbourne, Parkville, VIC 3010, Australia
| | - Paul G. Thomas
- Department of Immunology, St Jude Children’s Research Hospital, Memphis, TN 38105, USA
| | - Vanessa Venturi
- Complex Systems in Biology Group, Centre for Vascular Research, University of New South Wales, Kensington 2052, Australia
| | - Miles P. Davenport
- Complex Systems in Biology Group, Centre for Vascular Research, University of New South Wales, Kensington 2052, Australia
| | - Peter C. Doherty
- Department of Microbiology and Immunology, University of Melbourne, Parkville, VIC 3010, Australia
- Department of Immunology, St Jude Children’s Research Hospital, Memphis, TN 38105, USA
| | - Stephen J. Turner
- Department of Microbiology and Immunology, University of Melbourne, Parkville, VIC 3010, Australia
| | - Nicole L. La Gruta
- Department of Microbiology and Immunology, University of Melbourne, Parkville, VIC 3010, Australia
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36
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Petrovas C, Mueller YM, Yang G, Altork SR, Jacobson JM, Pitsakis PG, Mounzer KC, Altman JD, Katsikis PD. Actin integrity is indispensable for CD95/Fas-induced apoptosis of HIV-specific CD8+ T cells. Apoptosis 2008; 12:2175-86. [PMID: 17891455 DOI: 10.1007/s10495-007-0128-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
We have recently provided data suggesting a potential role for mitochondria and Bcl-2-family molecules in apoptosis sensitivity of HIV-specific CD8+ T cells. Here, we report on the role of filamentous (F) actin in this process. Disruption of actin by cytochalasin D (cytD) or lantrunculin A remarkably reduced CD95/Fas-induced apoptosis of HIV-specific CD8+ T cells while their spontaneous apoptosis was unaffected. This inhibition cannot be attributed to changes of CD95/Fas distribution or levels in these cells. Furthermore, cytD treatment reduced CD95/Fas-induced apoptosis of CD8+ T cells from HIV+ patients independently of their differentiation status. CD95/Fas-induced apoptosis of both CD38+ and CD38- HIV-specific CD8+ T cells was inhibited by cytD treatment indicating that actin mediates this apoptotic process independently of the activation level of these cells. CytD was found to reduce the activation of caspase-8 induced by short treatment of purified CD8+ T cells from HIV+ patients with anti-CD95/Fas. Our data reveal actin as a critical mediator of HIV-specific CD8+ T cell apoptosis; further analysis of the molecular mechanisms governing this process may potentially contribute to design new therapies targeting the enhancement of the immune system in HIV infection.
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Affiliation(s)
- Constantinos Petrovas
- Department of Microbiology and Immunology, Institute for Molecular Medicine and Infectious Disease, Drexel University College of Medicine, Drexel University, 2900 Queen Lane, Philadelphia, PA 19129, USA
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37
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Abstract
T cells with a memory-like phenotype and possessing innate immune function have been previously identified as CD8(+)CD44(hi) cells. These cells rapidly secrete IFN-gamma upon stimulation with IL-12/IL-18 and are involved in innate responses to infection with Listeria monocytogenes. The signals regulating these cells are unclear. The Tec kinase Itk regulates T cell activation and we report here that a majority of the CD8(+) T cells in Itk null mice have a phenotype of CD44(hi) similar to memory-like innate T cells. These cells are observed in mice carrying an Itk mutant lacking the kinase domain, indicating that active Tec kinase signaling suppresses their presence. These cells carry preformed message for and are able to rapidly produce IFN-gamma upon stimulation in vitro with IL-12/IL-18, and endow Itk null mice the ability to effectively respond to infection with L. monocytogenes or exposure to lipopolysaccharides by secretion of IFN-gamma. Transfer of these cells rescues the ability of IFN-gamma null mice to reduce bacterial burden following L. monocytogenes infection, indicating that these cells are functional CD8(+)CD44(hi) T cells previously detected in vivo. These results indicate that active signals from Tec kinases regulate the development of memory-like CD8(+) T cells with innate function.
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Affiliation(s)
- Jianfang Hu
- Center for Molecular Immunology & Infectious Disease and Department of Veterinary & Biomedical Sciences, The Pennsylvania State University, University Park, PA 16802
- Immunology & Infectious Disease Graduate Program, The Pennsylvania State University, University Park, PA 16802
| | - Nisebita Sahu
- Center for Molecular Immunology & Infectious Disease and Department of Veterinary & Biomedical Sciences, The Pennsylvania State University, University Park, PA 16802
- Department of Biochemistry & Molecular Biology, The Pennsylvania State University, University Park, PA 16802
| | - Elizabeth Walsh
- Center for Molecular Immunology & Infectious Disease and Department of Veterinary & Biomedical Sciences, The Pennsylvania State University, University Park, PA 16802
- Pathobiology Graduate Program, The Pennsylvania State University, University Park, PA 16802
| | - Avery August
- Center for Molecular Immunology & Infectious Disease and Department of Veterinary & Biomedical Sciences, The Pennsylvania State University, University Park, PA 16802
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38
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Abstract
Phosphorylation of MAP kinases is important for proper translation of T cell antigen receptor (TCR) signals into thymocyte cell fates, but the role of MAP kinase phosphatase (MKP) activity in thymocyte development has not been characterized. To explore the role of MKP in thymocytes, we constructed a double mutant MKP-3 (DM-MKP3) that acts as a dominant-negative inhibitor of ERK- and JNK-specific MKP. Thymocytes developing in the presence of DM-MKP3 have enhanced frequencies of both CD4 and CD8 mature, single-positive cells and no increase in apoptosis. Expression of DM-MKP3 also results in an increased proportion of thymocytes with high levels of both CD69 and TCRbeta, suggesting that the increased proportion of mature thymocytes is the result of an increased probability that CD4(+)CD8(+) cells will be positively selected. Thus, MKP activity controls thymocyte cell fate by regulating the threshold of TCR signaling that is able to induce positive selection.
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Affiliation(s)
- Matthew L. Bettini
- Department of Pathology and Laboratory Medicine, 101 Woodruff Circle, Emory University School of Medicine, Atlanta, GA 30322
| | - Gilbert J. Kersh
- Department of Pathology and Laboratory Medicine, 101 Woodruff Circle, Emory University School of Medicine, Atlanta, GA 30322
- *To whom correspondence should be addressed. E-mail:
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39
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Wolchok JD, Yuan J, Houghton AN, Gallardo HF, Rasalan TS, Wang J, Zhang Y, Ranganathan R, Chapman PB, Krown SE, Livingston PO, Heywood M, Riviere I, Panageas KS, Terzulli SL, Perales MA. Safety and immunogenicity of tyrosinase DNA vaccines in patients with melanoma. Mol Ther 2007; 15:2044-50. [PMID: 17726460 DOI: 10.1038/sj.mt.6300290] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
Immunity to self antigens on cancer is constrained by tolerance/ignorance. DNA vaccines encoding xenogeneic differentiation antigens, such as tyrosinase (TYR), mediate tumor protection and regression in implantable mouse models, and dogs with spontaneous melanoma. We conducted a trial of mouse and human TYR DNA vaccines in stage III/IV melanoma patients. Eighteen human leukocyte antigen (HLA)-A*0201(+) melanoma patients were randomized as follows: one group received three mouse TYR DNA injections followed by three human TYR DNA injections; the other group received the same vaccines in opposite sequence. The study was conducted at three dose levels: 100, 500, and 1,500 microg DNA/injection, administered intramuscularly (IM) every 3 weeks. Most toxicities were grade 1 injection site reactions. Seven patients developed CD8(+) T-cell responses, defined by a >3 SD increase in baseline reactivity to TYR peptide in tetramer or intracellular cytokine staining (ICS) assays. There was found to be no relationship between dose, assigned schedule, and T-cell response. At a median of 42 months follow-up, median survival has not been reached. Mouse and human TYR DNA vaccines were found safe and induced CD8(+) T-cell responses in 7 of 18 patients. T cells recognizing a native TYR peptide had a phenotype consistent with that of effector memory cells.
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Affiliation(s)
- Jedd D Wolchok
- Department of Medicine, Memorial Sloan-Kettering Cancer Center, New York, New York 10021, USA.
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40
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Marzo AL, Yagita H, Lefrançois L. Cutting edge: migration to nonlymphoid tissues results in functional conversion of central to effector memory CD8 T cells. J Immunol 2007; 179:36-40. [PMID: 17579018 PMCID: PMC2861291 DOI: 10.4049/jimmunol.179.1.36] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Memory CD8 T cells, essential for defense against intracellular pathogens, are heterogeneous with respect to phenotype and function. Constitutively lytic effector memory cells primarily reside in nonlymphoid tissues, whereas secondary lymphoid tissues contain functionally quiescent central memory cells. However, the mechanism by which functionally distinct memory populations are maintained is unknown. In this study, we show that resting CD8 memory cells modified their functional abilities upon entry into nonlymphoid tissues, as exemplified by the induction of granzyme B and lytic activity. Contemporaneously, the costimulator CD27 was down-regulated. These findings hold important implications for memory cell lineage development and tissue-specific immunity.
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Affiliation(s)
- Amanda L. Marzo
- Department of Immunology, University of Connecticut Health Center, Farmington, CT 06030
| | - Hideo Yagita
- Department of Immunology, Juntendo University School of Medicine, Tokyo, Japan
| | - Leo Lefrançois
- Department of Immunology, University of Connecticut Health Center, Farmington, CT 06030
- Address correspondence and reprint requests to: Dr. Leo Lefrançois, Department of Immunology, University of Connecticut Health Center, 263 Farmington Avenue, Farmington, CT 06030-1319.
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41
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Plunkett FJ, Franzese O, Finney HM, Fletcher JM, Belaramani LL, Salmon M, Dokal I, Webster D, Lawson ADG, Akbar AN. The loss of telomerase activity in highly differentiated CD8+CD28-CD27- T cells is associated with decreased Akt (Ser473) phosphorylation. J Immunol 2007; 178:7710-9. [PMID: 17548608 DOI: 10.4049/jimmunol.178.12.7710] [Citation(s) in RCA: 152] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The enzyme telomerase is essential for maintaining the replicative capacity of memory T cells. Although CD28 costimulatory signals can up-regulate telomerase activity, human CD8(+) T cells lose CD28 expression after repeated activation. Nevertheless, telomerase is still inducible in CD8(+)CD28(-) T cells. To identify alternative costimulatory pathways that may be involved, we introduced chimeric receptors containing the signaling domains of CD28, CD27, CD137, CD134, and ICOS in series with the CD3 zeta (zeta) chain into primary human CD8(+) T cells. Although CD3 zeta-chain signals alone were ineffective, triggering of all the other constructs induced proliferation and telomerase activity. However, not all CD8(+)CD28(-) T cells could up-regulate this enzyme. The further fractionation of CD8(+)CD28(-) T cells into CD8(+)CD28(-) CD27(+) and CD8(+)CD28(-)CD27(-) subsets showed that the latter had significantly shorter telomeres and extremely poor telomerase activity. The restoration of CD28 signaling in CD8(+)CD28(-)CD27(-) T cells could not reverse the low telomerase activity that was not due to decreased expression of human telomerase reverse transcriptase, the enzyme catalytic subunit. Instead, the defect was associated with decreased phosphorylation of the kinase Akt, that phosphorylates human telomerase reverse transcriptase to induce telomerase activity. Furthermore, the defective Akt phosphorylation in these cells was specific for the Ser(473) but not the Thr(308) phosphorylation site of this molecule. Telomerase down-regulation in highly differentiated CD8(+)CD28(-)CD27(-) T cells marks their inexorable progress toward a replicative end stage after activation. This limits the ability of memory CD8(+) T cells to be maintained by continuous proliferation in vivo.
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Affiliation(s)
- Fiona J Plunkett
- Department of Immunology and Molecular Pathology, University College London, 46 Cleveland Street, London, United Kingdom
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42
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Siebenhaar F, Sharov AA, Peters EMJ, Sharova TY, Syska W, Mardaryev AN, Freyschmidt-Paul P, Sundberg JP, Maurer M, Botchkarev VA. Substance P as an Immunomodulatory Neuropeptide in a Mouse Model for Autoimmune Hair Loss (Alopecia Areata). J Invest Dermatol 2007; 127:1489-97. [PMID: 17273166 DOI: 10.1038/sj.jid.5700704] [Citation(s) in RCA: 81] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Alopecia areata (AA) is an autoimmune disorder of the hair follicle characterized by inflammatory cell infiltrates around actively growing (anagen) hair follicles. Substance P (SP) plays a critical role in the cutaneous neuroimmune network and influences immune cell functions through the neurokinin-1 receptor (NK-1R). To better understand the role of SP as an immunomodulatory neuropeptide in AA, we studied its expression and effects on immune cells in a C3H/HeJ mouse model for AA. During early stages of AA development, the number of SP-immunoreactive nerve fibers in skin is increased, compared to non-affected mice. However, during advanced stages of AA, the number of SP-immunoreactive nerves and SP protein levels in skin are decreased, whereas the expression of the SP-degrading enzyme neutral endopeptidase (NEP) is increased, compared to control skin. In AA, NK-1R is expressed on CD8+ lymphocytes and macrophages accumulating around affected hair follicles. Additional SP supply to the skin of AA-affected mice leads to a significant increase of mast cell degranulation and to accelerated hair follicle regression (catagen), accompanied by an increase of CD8+ cells-expressing granzyme B. These data suggest that SP, NEP, and NK-1R serve as important regulators in the molecular signaling network modulating inflammatory response in autoimmune hair loss.
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Affiliation(s)
- Frank Siebenhaar
- Department of Dermatology, Boston University School of Medicine, Boston, Massachusetts 02118, USA
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43
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Kraft ARM, Krux F, Schimmer S, Ohlen C, Greenberg PD, Dittmer U. CpG oligodeoxynucleotides allow for effective adoptive T-cell therapy in chronic retroviral infection. Blood 2007; 109:2982-4. [PMID: 17148590 DOI: 10.1182/blood-2006-06-022178] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Adoptive T-cell therapy in cancer or chronic viral infections is often impeded by the development of functional impairment of the transferred cells. To overcome this therapeutic limitation we combined adoptive transfer of naive, virus-specific CD8+ T cells with immunostimulative CpG oligodeoxynucleotides (ODNs) in mice chronically infected with the Friend retrovirus. The CpG-ODN co-injection prevented the T cells from developing functional defects in IFNgamma and granzyme production and degranulation of cytotoxic molecules. Thus, the transferred T cells were able to reduce chronic viral loads when combined with CpG-ODNs. This strategy provides a new approach for developing successful adoptive T-cell therapy against chronic infections.
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Affiliation(s)
- Anke R M Kraft
- Institute for Virology, University of Duisburg-Essen, Essen, Germany
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44
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Marsland BJ, Nembrini C, Grün K, Reissmann R, Kurrer M, Leipner C, Kopf M. TLR ligands act directly upon T cells to restore proliferation in the absence of protein kinase C-theta signaling and promote autoimmune myocarditis. J Immunol 2007; 178:3466-73. [PMID: 17339441 DOI: 10.4049/jimmunol.178.6.3466] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The serine/threonine kinase, protein kinase C-theta (PKC-theta), plays a central role in the activation and differentiation of Th2 cells while being redundant in CD4+ and CD8+ antiviral responses. Recent evidence indicates that PKC-theta may however be required for some T cell-driven autoimmune responses. We have investigated the role of PKC-theta in the induction of autoimmune myocarditis induced by either Coxsackie B3 virus infection or immunization with alpha-myosin/CFA (experimental autoimmune myocarditis (EAM)). PKC-theta-deficient mice did not develop EAM as shown by impaired inflammatory cell infiltration into the heart, reduced CD4+ T cell IL-17 production, and the absence of a myosin-specific Ab response. Comparatively, PKC-theta was not essential for both early and late-phase Coxsackie virus-induced myocarditis. We sought to find alternate pathways of immune stimulation that might reconcile the differential requirements for PKC-theta in these two disease models. We found systemic administration of the TLR ligand CpG restored EAM in PKC-theta-deficient mice. CpG could act directly upon TLR9-expressing T cells to restore proliferation and up-regulation of Bcl-x(L), but exogenous IL-6 and TGF-beta was required for Th17 cell differentiation. Taken together, these results indicate that TLR-mediated activation of T cells can directly overcome the requirement for PKC-theta signaling and, combined with the dendritic cell-derived cytokine milieu, can promote the development of autoimmunity.
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Affiliation(s)
- Benjamin J Marsland
- Molecular Biomedicine, Swiss Federal Institute of Technology, Wagistrasse 27, CH 8952 Zurich-Schlieren, Switzerland.
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45
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Towne CF, York IA, Watkin LB, Lazo JS, Rock KL. Analysis of the Role of Bleomycin Hydrolase in Antigen Presentation and the Generation of CD8 T Cell Responses. J Immunol 2007; 178:6923-30. [PMID: 17513741 DOI: 10.4049/jimmunol.178.11.6923] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Long oligopeptides (>10 residues) are generated during the catabolism of cellular proteins in the cytosol. To be presented to T cells, such peptides must be trimmed by aminopeptidases to the proper size (typically 8-10 residues) to stably bind to MHC class I molecules. Aminopeptidases also destroy epitopes by trimming them to even shorter lengths. Bleomycin hydrolase (BH) is a cytosolic aminopeptidase that has been suggested to play a key role in generating MHC class I-presented peptides. We show that BH-deficient cells from mice are unimpaired in their ability to present epitopes from N-extended precursors or whole Ags and express normal levels of MHC class I molecules. Similarly, BH-deficient mice develop normal CD8(+) T cell responses to eight epitopes from three different viruses in vivo. Therefore, BH by itself is not essential for the generation or destruction of MHC class I peptides. In contrast, when BH(-/-) mice are crossed to mice lacking another cytosolic aminopeptidase, leucine aminopeptidase, the resulting BH(-/-)leucine aminopeptidase(-/-) progeny show a selective increase in CD8(+) T cell responses to the gp276 epitope from lymphocytic choriomeningitis virus, whereas the ability to present and respond to several other epitopes is unchanged. Therefore, BH does influence presentation of some Ags, although its role is largely redundant with other aminopeptidases.
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Affiliation(s)
- Charles F Towne
- Department of Pathology, University of Massachusetts Medical School, Worcester, MA 01655, USA
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46
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Trudeau JD, Chandler T, Soukhatcheva G, Verchere CB, Tan R. Prospective prediction of spontaneous but not recurrent autoimmune diabetes in the non-obese diabetic mouse. Diabetologia 2007; 50:1015-23. [PMID: 17334749 DOI: 10.1007/s00125-007-0600-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/04/2006] [Accepted: 12/12/2006] [Indexed: 10/23/2022]
Abstract
AIMS/HYPOTHESIS Type 1 diabetes is a T cell-mediated autoimmune disease with a clinically silent prodrome, during which prediction and treatment of disease are theoretically possible. Using retrospective analysis, spontaneous disease in the non-obese diabetic (NOD) mouse has been correlated with islet-specific glucose-6-phosphatase catalytic subunit-related protein (IGRP)-reactive CD8+ T cells in the peripheral blood. In this study, we determined prospectively whether IGRP-reactive T cells in peripheral blood could predict disease occurrence. Since recurrent autoimmunity is an important contributor to transplant failure, we also determined whether failure of islet grafts (syngeneic and allogeneic) could be predicted by the presence of circulating autoreactive T cells. MATERIALS AND METHODS Peripheral blood samples were taken weekly from female NOD mice between the ages of 8 and 30 weeks and from NOD mice transplanted with NODscid islets. Peripheral blood cells and islet grafts were analysed for the presence of IGRP-reactive CD8+ T cells by flow cytometry. RESULTS Prospective analysis of peripheral blood IGRP-reactive T cells in the prediabetic period predicted disease development with a sensitivity of 100% and a specificity of 60%, resulting in positive and negative predictive values of 85 and 100%, respectively. Significant proportions of IGRP-reactive T cells were found in the grafts, but not in peripheral blood of NOD mice undergoing syngeneic and allogeneic rejection. CONCLUSIONS/INTERPRETATION The occurrence of spontaneous diabetes can be predicted prospectively by measuring peripheral blood autoreactive T cells. Rejection of syngeneic or allogeneic islets is associated with large populations of autoreactive CD8+ T cells within islets, suggesting that immunodominant autoreactive T cells during the prediabetic period are also responsible for autoimmune graft rejection.
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Affiliation(s)
- J D Trudeau
- Child and Family Research Institute, BC Children's Hospital, Vancouver, BC, Canada
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47
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Moore ML, Chi MH, Zhou W, Goleniewska K, O'Neal JF, Higginbotham JN, Peebles RS. Cutting Edge: Oseltamivir decreases T cell GM1 expression and inhibits clearance of respiratory syncytial virus: potential role of endogenous sialidase in antiviral immunity. J Immunol 2007; 178:2651-4. [PMID: 17312105 DOI: 10.4049/jimmunol.178.5.2651] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The sialoglycosphingolipid GM1 is important for lipid rafts and immune cell signaling. T cell activation in vitro increases GM1 expression and increases endogenous sialidase activity. GM1 expression has been hypothesized to be regulated by endogenous sialidase. We tested this hypothesis in vivo using a mouse model of respiratory syncytial virus (RSV) infection. RSV infection increased endogenous sialidase activity in lung mononuclear cells. RSV infection increased lung CD8+ T cell surface GM1 expression. Activated CD8+ T cells in the lungs of RSV-infected mice were GM1(high). Treatment of RSV-infected mice with the sialidase/neuraminidase inhibitor oseltamivir decreased T cell surface GM1 levels. Oseltamivir treatment decreased RSV-induced weight loss and inhibited RSV clearance. Our data indicate a novel role for an endogenous sialidase in regulating T cell GM1 expression and antiviral immunity. Also, oseltamivir, an important anti-influenza drug, inhibits the clearance of a respiratory virus that lacks a neuraminidase gene, RSV.
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Affiliation(s)
- Martin L Moore
- Department of Medicine, Vanderbilt University School of Medicine, Nashville, TN 37232, USA
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48
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Saibil SD, Jones RG, Deenick EK, Liadis N, Elford AR, Vainberg MG, Baerg H, Woodgett JR, Gerondakis S, Ohashi PS. CD4+ and CD8+ T cell survival is regulated differentially by protein kinase Ctheta, c-Rel, and protein kinase B. J Immunol 2007; 178:2932-9. [PMID: 17312138 DOI: 10.4049/jimmunol.178.5.2932] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
An effective immune response requires the expansion and survival of a large number of activated T cells. This study compared the role of protein kinase C (PKC)theta and associated signaling molecules in the survival of activated primary CD4+ vs CD8+ murine T cells. We demonstrate that the absence of PKCtheta resulted in a moderate survival defect in CD4+ T cells and a striking survival defect of CD8+ T lymphocytes. CD8+ T cells lacking the c-Rel, but not the NF-kappaB1/p50, member of the NF-kappaB family of transcription factors displayed a similar impairment in cell survival as PKCtheta(-/-) CD8(+) T lymphocytes. This implicates c-Rel as a key target of PKCtheta-mediated survival signals in CD8+ T cells. In addition, both c-Rel(-/-) and PKCtheta(-/-) T cells also displayed impaired expression of the antiapoptotic Bcl-x(L) protein upon activation. Changes in Bcl-x(L) expression, however, did not correlate with the survival of CD4+ or CD8+ lymphocytes. The addition of protein kinase B-mediated survival signals could restore partially CD4+ T cell viability, but did not dramatically influence CD8+ survival. Active protein kinase B was also unable to restore proliferative responses in CD8+ PKCtheta(-/-) T cells. The survival of CD4+ and CD8+ T cells deficient in either PKCtheta or c-Rel, however, was promoted by the addition of IL-2. Collectively, these data demonstrate that CD4+ and CD8+ T cell survival signals are differentially programmed.
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Affiliation(s)
- Samuel D Saibil
- Department of Medical Biophysics, University of Toronto, 610 University Avenue, Toronto, Ontario, Canada
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49
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Nie Z, Bren GD, Vlahakis SR, Schimnich AA, Brenchley JM, Trushin SA, Warren S, Schnepple DJ, Kovacs CM, Loutfy MR, Douek DC, Badley AD. Human immunodeficiency virus type 1 protease cleaves procaspase 8 in vivo. J Virol 2007; 81:6947-56. [PMID: 17442709 PMCID: PMC1933285 DOI: 10.1128/jvi.02798-06] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Human immunodeficiency virus type 1 (HIV-1) infection causes apoptosis of infected CD4 T cells as well as uninfected (bystander) CD4 and CD8 T cells. It remains unknown what signals cause infected cells to die. We demonstrate that HIV-1 protease specifically cleaves procaspase 8 to create a novel fragment termed casp8p41, which independently induces apoptosis. casp8p41 is specific to HIV-1 protease-induced death but not other caspase 8-dependent death stimuli. In HIV-1-infected patients, casp8p41 is detected only in CD4(+) T cells, predominantly in the CD27(+) memory subset, its presence increases with increasing viral load, and it colocalizes with both infected and apoptotic cells. These data indicate that casp8p41 independently induces apoptosis and is a specific product of HIV-1 protease which may contribute to death of HIV-1-infected cells.
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Affiliation(s)
- Zilin Nie
- Division of Infectious Diseases, Mayo Clinic College of Medicine, 200 First Street SW, Rochester, MN 55905, USA
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50
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Tao J, Gao Y, Li MO, He W, Chen L, Harvev B, Davis RJ, Flavell RA, Yin Z. JNK2 negatively regulates CD8+ T cell effector function and anti-tumor immune response. Eur J Immunol 2007; 37:818-29. [PMID: 17301952 DOI: 10.1002/eji.200636726] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
JNK1 and JNK2 have distinct effects on activation, differentiation and function of CD8+ T cells. Our early studies demonstrated that JNK1 is required for CD8+ T cell-mediated tumor immune surveillance. However, the role of JNK2 in CD8+ T cell response and effector functions, especially in anti-tumor immune response, is unknown. To define the role of JNK2 in antigen-specific immune response, we have investigated CD8+ T cells from OT-1 CD8+ transgenic mice in response to either high- or low-affinity peptides. JNK2-/- CD8+ T cells proliferated better in response to both peptides, with more cell division and less cell death. In addition, JNK2-/- CD8+ T cells produced higher levels of IFN-gamma, which is associated with increased expression of T-bet and Eomesodermin (Eomes). Moreover, JNK2-/- CD8+ T cells expresses high levels of granzyme B and show increased CTL activity. Finally, the enhanced expansion and effector function of JNK2-/- CD8+ T cells was further evidenced by their capacity to delay tumor growth in vivo. In summary, our results demonstrate that JNK2 negatively regulates antigen-specific CD8+ T cell expansion and effector function, and thus selectively blocking JNK2 in CD8+ T cells may potentially enhance anti-tumor immune response.
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Affiliation(s)
- Jian Tao
- Section of Rheumatology, Department of Medicine, Yale School of Medicine, New Haven, CT 06520-8031, USA
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