1
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Sabreen G, Rahman K, Gupta R, Chaturvedi CP, Srivastava J, Chandra D, Singh MK, Yadav S, Sharma A, Sarkar M, Kashyap R. Role of miRNAs in T-cell activation and Th17/Treg-cell imbalance in acquired aplastic anemia. Int J Lab Hematol 2024; 46:515-522. [PMID: 38357712 DOI: 10.1111/ijlh.14243] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Accepted: 01/10/2024] [Indexed: 02/16/2024]
Abstract
BACKGROUND Altered T-cell repertoire with an aberrant T-cell activation and imbalance of the Th17/Treg cells has been reported in acquired aplastic anemia (aAA). miRNAs are well known to orchestrate T-cell activation and differentiation, however, their role in aAA is poorly characterized. The study aimed at identifying the profile of miRNAs likely to be involved in T-cell activation and the Th17/Treg-cell imbalance in aAA, to explore newer therapeutic targets. METHODS Five milliliters peripheral blood samples from 30 patients of aAA and 15 healthy controls were subjected to flow cytometry for evaluating Th17- and Treg-cell subsets. The differential expression of 7 selected miRNAs viz; hsa-miR-126-3p, miR-146b-5p, miR-155-5p, miR-16, miR-17, miR-326, and miR-181c was evaluated in the PB-MNCs. Expression analysis of the miRNAs was performed using qRT-PCR and fold change was calculated by 2-ΔΔCt method. The alterations in the target genes of deregulated miRNAs were assessed by qRT-PCR. The targets studied included various transcription factors, cytokines, and downstream proteins. RESULTS The absolute CD3+ lymphocytes were significantly elevated in the PB of aAA patients when compared with healthy controls (p < 0.0035), however, the CD4:CD8 ratio was unperturbed. Th17: Treg-cell ratio was altered in aAA patients (9.1 vs. 3.7%, p value <0.05), which correlated positively with disease severity and the PNH positive aAA. Across all severities of aAA, altered expression of the 07 miRNAs was noted in comparison to controls; upregulation of miR-155 (FC-2.174, p-value-0.0001), miR-146 (FC-2.006, p-value-0.0001), and miR-17 (FC-3.1, p-value-0.0001), and downregulation of miR-126 (FC-0.329, p-value-0.0001), miR-181c (FC-0.317, p-value-0.0001), miR-16 (FC-0.348, p-value-0.0001), and miR-326 (FC-0.334, p-value-0.0001). Target study for these miRNAs revealed an increased expression of transcription factors responsible for Th1 and Th17 differentiation (T-bet, RORϒt, IL-17, IL-6, and IFN-ϒ), T-cell activation (NFκB, MYC, and PIK3R2), downregulation of FOX-P3, and other regulatory downstream molecules like SHIP-1, ETS-1, IRAK-1, TRAF-6, and PTEN. CONCLUSION The study for the first time highlights the plausible role of different miRNAs in deregulating the Th17/Treg-cell imbalance in aAA, and comprehensively suggest the role of altered NF-kB and mTOR pathways in aAA. The axis may be actively explored for development of newer therapeutic targets in aAA.
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Affiliation(s)
- G Sabreen
- Department of Hematology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, India
| | - Khaliqur Rahman
- Department of Hematology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, India
| | - Ruchi Gupta
- Department of Hematology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, India
| | - Chandra P Chaturvedi
- Department of Hematology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, India
| | - Jyotika Srivastava
- Department of Hematology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, India
| | - Dinesh Chandra
- Department of Hematology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, India
| | - Manish K Singh
- Department of Hematology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, India
| | - S Yadav
- Department of Hematology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, India
| | - Akhilesh Sharma
- Department of Hematology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, India
| | - Manoj Sarkar
- Department of Hematology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, India
| | - Rajesh Kashyap
- Department of Hematology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, India
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2
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Immune Checkpoint Receptors Signaling in T Cells. Int J Mol Sci 2022; 23:ijms23073529. [PMID: 35408889 PMCID: PMC8999077 DOI: 10.3390/ijms23073529] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Revised: 03/16/2022] [Accepted: 03/21/2022] [Indexed: 12/15/2022] Open
Abstract
The characterization of the receptors negatively modulating lymphocyte function is rapidly advancing, driven by success in tumor immunotherapy. As a result, the number of immune checkpoint receptors characterized from a functional perspective and targeted by innovative drugs continues to expand. This review focuses on the less explored area of the signaling mechanisms of these receptors, of those expressed in T cells. Studies conducted mainly on PD-1, CTLA-4, and BTLA have evidenced that the extracellular parts of some of the receptors act as decoy receptors for activating ligands, but in all instances, the tyrosine phosphorylation of their cytoplasmatic tail drives a crucial inhibitory signal. This negative signal is mediated by a few key signal transducers, such as tyrosine phosphatase, inositol phosphatase, and diacylglycerol kinase, which allows them to counteract TCR-mediated activation. The characterization of these signaling pathways is of great interest in the development of therapies for counteracting tumor-infiltrating lymphocyte exhaustion/anergy independently from the receptors involved.
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3
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PHLPP Signaling in Immune Cells. Curr Top Microbiol Immunol 2022; 436:117-143. [DOI: 10.1007/978-3-031-06566-8_5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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4
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So EY, Sun C, Wu KQ, Dubielecka PM, Reginato AM, Liang OD. Inhibition of lipid phosphatase SHIP1 expands myeloid-derived suppressor cells and attenuates rheumatoid arthritis in mice. Am J Physiol Cell Physiol 2021; 321:C569-C584. [PMID: 34288720 DOI: 10.1152/ajpcell.00433.2020] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Rheumatoid arthritis (RA) is a debilitating autoimmune disease of unknown cause, characterized by infiltration and accumulation of activated immune cells in the synovial joints where cartilage and bone destructions occur. Myeloid-derived suppressor cells (MDSCs) are of myeloid origin and are able to suppress T cell responses. Src homology 2 domain containing inositol polyphosphate 5-phosphatase 1 (SHIP1) was shown to be involved in the regulation of MDSC differentiation. The purpose of the present study was to investigate the effect of inhibition of SHIP1 on expansion of MDSCs in RA using a collagen-induced inflammatory arthritis (CIA) mouse model. In DBA/1 mice treatment with a small molecule specific SHIP1 inhibitor 3α-aminocholestane (3AC) induced a marked expansion of MDSCs in vivo. Both pre-treatment with 3AC of DBA/1 mice prior to CIA induction and intervention with 3AC during CIA progression significantly reduced disease incidence and severity. Adoptive transfer of MDSCs isolated from 3AC-treated mice, but not naïve MDSCs from normal mice, into CIA mice significantly reduced disease incidence and severity, indicating that the 3AC-induced MDSCs were the cellular mediators of the observed amelioration of the disease. In conclusion, inhibition of SHIP1 expands MDSCs in vivo and attenuates development of CIA in mice. Small molecule specific inhibition of SHIP1 may therefore offer therapeutic benefit to patients with RA and other autoimmune diseases.
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Affiliation(s)
- Eui-Young So
- Division of Hematology/Oncology, Department of Medicine, Rhode Island Hospital, Warren Alpert Medical School, Brown University, Providence, Rhode Island, United States
| | - Changqi Sun
- Division of Rheumatology, Department of Medicine, Rhode Island Hospital, Warren Alpert Medical School, Brown University, Providence, Rhode Island, United States
| | - Keith Q Wu
- Division of Hematology/Oncology, Department of Medicine, Rhode Island Hospital, Warren Alpert Medical School, Brown University, Providence, Rhode Island, United States
| | - Patrycja M Dubielecka
- Division of Hematology/Oncology, Department of Medicine, Rhode Island Hospital, Warren Alpert Medical School, Brown University, Providence, Rhode Island, United States
| | - Anthony M Reginato
- Division of Rheumatology, Department of Medicine, Rhode Island Hospital, Warren Alpert Medical School, Brown University, Providence, Rhode Island, United States
| | - Olin D Liang
- Division of Hematology/Oncology, Department of Medicine, Rhode Island Hospital, Warren Alpert Medical School, Brown University, Providence, Rhode Island, United States
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5
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Selective deletion of SHIP-1 in hematopoietic cells in mice leads to severe lung inflammation involving ILC2 cells. Sci Rep 2021; 11:9220. [PMID: 33911168 PMCID: PMC8080607 DOI: 10.1038/s41598-021-88677-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Accepted: 04/14/2021] [Indexed: 11/09/2022] Open
Abstract
Src homology 2 domain-containing inositol 5-phosphatase 1 (SHIP-1) regulates the intracellular levels of phosphotidylinositol-3, 4, 5-trisphosphate, a phosphoinositide 3-kinase (PI3K) product. Emerging evidence suggests that the PI3K pathway is involved in allergic inflammation in the lung. Germline or induced whole-body deletion of SHIP-1 in mice led to spontaneous type 2-dominated pulmonary inflammation, demonstrating that SHIP-1 is essential for lung homeostasis. However, the mechanisms by which SHIP-1 regulates lung inflammation and the responsible cell types are still unclear. Deletion of SHIP-1 selectively in B cells, T cells, dendritic cells (DC) or macrophages did not lead to spontaneous allergic inflammation in mice, suggesting that innate immune cells, particularly group 2 innate lymphoid cells (ILC2 cells) may play an important role in this process. We tested this idea using mice with deletion of SHIP-1 in the hematopoietic cell lineage and examined the changes in ILC2 cells. Conditional deletion of SHIP-1 in hematopoietic cells in Tek-Cre/SHIP-1 mice resulted in spontaneous pulmonary inflammation with features of type 2 immune responses and airway remodeling like those seen in mice with global deletion of SHIP-1. Furthermore, when compared to wild-type control mice, Tek-Cre/SHIP-1 mice displayed a significant increase in the number of IL-5/IL-13 producing ILC2 cells in the lung at baseline and after stimulation by allergen Papain. These findings provide some hints that PI3K signaling may play a role in ILC2 cell development at baseline and in response to allergen stimulation. SHIP-1 is required for maintaining lung homeostasis potentially by restraining ILC2 cells and type 2 inflammation.
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6
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Renrick AN, Thounaojam MC, de Aquino MTP, Chaudhuri E, Pandhare J, Dash C, Shanker A. Bortezomib Sustains T Cell Function by Inducing miR-155-Mediated Downregulation of SOCS1 and SHIP1. Front Immunol 2021; 12:607044. [PMID: 33717088 PMCID: PMC7946819 DOI: 10.3389/fimmu.2021.607044] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Accepted: 01/07/2021] [Indexed: 01/18/2023] Open
Abstract
Suppressive mechanisms operating within T cells are linked to immune dysfunction in the tumor microenvironment. We have previously reported using adoptive T cell immunotherapy models that tumor-bearing mice treated with a regimen of proteasome inhibitor, bortezomib - a dipeptidyl boronate, show increased antitumor lymphocyte effector function and survival. Here, we identify a mechanism for the improved antitumor CD8+ T cell function following bortezomib treatment. Intravenous administration of bortezomib at a low dose (1 mg/kg body weight) in wild-type or tumor-bearing mice altered the expression of a number of miRNAs in CD8+ T cells. Specifically, the effect of bortezomib was prominent on miR-155 - a key cellular miRNA involved in T cell function. Importantly, bortezomib-induced upregulation of miR-155 was associated with the downregulation of its targets, the suppressor of cytokine signaling 1 (SOCS1) and inositol polyphosphate-5-phosphatase (SHIP1). Genetic and biochemical analysis confirmed a functional link between miR-155 and these targets. Moreover, activated CD8+ T cells treated with bortezomib exhibited a significant reduction in programmed cell death-1 (PD-1) expressing SHIP1+ phenotype. These data underscore a mechanism of action by which bortezomib induces miR-155-dependent downregulation of SOCS1 and SHIP1 negative regulatory proteins, leading to a suppressed PD-1-mediated T cell exhaustion. Collectively, data provide novel molecular insights into bortezomib-mediated lymphocyte-stimulatory effects that could overcome immunosuppressive actions of tumor on antitumor T cell functions. The findings support the approach that bortezomib combined with other immunotherapies would lead to improved therapeutic outcomes by overcoming T cell exhaustion in the tumor microenvironment.
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Affiliation(s)
- Ariana N Renrick
- Department of Microbiology, Immunology and Physiology, School of Medicine, Meharry Medical College, Nashville, TN, United States.,School of Graduate Studies and Research, Meharry Medical College, Nashville, TN, United States
| | - Menaka C Thounaojam
- Department of Biochemistry, Cancer Biology, Neuroscience and Pharmacology, School of Medicine, Meharry Medical College, Nashville, TN, United States
| | - Maria Teresa P de Aquino
- Department of Biochemistry, Cancer Biology, Neuroscience and Pharmacology, School of Medicine, Meharry Medical College, Nashville, TN, United States
| | - Evan Chaudhuri
- Department of Microbiology, Immunology and Physiology, School of Medicine, Meharry Medical College, Nashville, TN, United States.,School of Graduate Studies and Research, Meharry Medical College, Nashville, TN, United States
| | - Jui Pandhare
- Department of Microbiology, Immunology and Physiology, School of Medicine, Meharry Medical College, Nashville, TN, United States.,School of Graduate Studies and Research, Meharry Medical College, Nashville, TN, United States.,Center for AIDS Health Disparities Research, Meharry Medical College, Nashville, TN, United States
| | - Chandravanu Dash
- School of Graduate Studies and Research, Meharry Medical College, Nashville, TN, United States.,Department of Biochemistry, Cancer Biology, Neuroscience and Pharmacology, School of Medicine, Meharry Medical College, Nashville, TN, United States.,Center for AIDS Health Disparities Research, Meharry Medical College, Nashville, TN, United States.,Vanderbilt Institute for Infection, Immunology and Inflammation, Vanderbilt University, Nashville, TN, United States
| | - Anil Shanker
- School of Graduate Studies and Research, Meharry Medical College, Nashville, TN, United States.,Department of Biochemistry, Cancer Biology, Neuroscience and Pharmacology, School of Medicine, Meharry Medical College, Nashville, TN, United States.,Vanderbilt Institute for Infection, Immunology and Inflammation, Vanderbilt University, Nashville, TN, United States.,Host-Tumor Interactions Research Program, Vanderbilt-Ingram Cancer Center, Vanderbilt University, Nashville, TN, United States
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7
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Saravia J, Raynor JL, Chapman NM, Lim SA, Chi H. Signaling networks in immunometabolism. Cell Res 2020; 30:328-342. [PMID: 32203134 PMCID: PMC7118125 DOI: 10.1038/s41422-020-0301-1] [Citation(s) in RCA: 105] [Impact Index Per Article: 26.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2019] [Accepted: 02/24/2020] [Indexed: 02/06/2023] Open
Abstract
Adaptive immunity is essential for pathogen and tumor eradication, but may also trigger uncontrolled or pathological inflammation. T cell receptor, co-stimulatory and cytokine signals coordinately dictate specific signaling networks that trigger the activation and functional programming of T cells. In addition, cellular metabolism promotes T cell responses and is dynamically regulated through the interplay of serine/threonine kinases, immunological cues and nutrient signaling networks. In this review, we summarize the upstream regulators and signaling effectors of key serine/threonine kinase-mediated signaling networks, including PI3K–AGC kinases, mTOR and LKB1–AMPK pathways that regulate metabolism, especially in T cells. We also provide our perspectives about the pending questions and clinical applicability of immunometabolic signaling. Understanding the regulators and effectors of immunometabolic signaling networks may uncover therapeutic targets to modulate metabolic programming and T cell responses in human disease.
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Affiliation(s)
- Jordy Saravia
- Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN, 38105, USA
| | - Jana L Raynor
- Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN, 38105, USA
| | - Nicole M Chapman
- Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN, 38105, USA
| | - Seon Ah Lim
- Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN, 38105, USA
| | - Hongbo Chi
- Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN, 38105, USA.
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8
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Beyond the Cell Surface: Targeting Intracellular Negative Regulators to Enhance T cell Anti-Tumor Activity. Int J Mol Sci 2019; 20:ijms20235821. [PMID: 31756921 PMCID: PMC6929154 DOI: 10.3390/ijms20235821] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2019] [Revised: 11/04/2019] [Accepted: 11/07/2019] [Indexed: 02/07/2023] Open
Abstract
It is well established that extracellular proteins that negatively regulate T cell function, such as Cytotoxic T-Lymphocyte-Associated protein 4 (CTLA-4) and Programmed Cell Death protein 1 (PD-1), can be effectively targeted to enhance cancer immunotherapies and Chimeric Antigen Receptor T cells (CAR-T cells). Intracellular proteins that inhibit T cell receptor (TCR) signal transduction, though less well studied, are also potentially useful therapeutic targets to enhance T cell activity against tumor. Four major classes of enzymes that attenuate TCR signaling include E3 ubiquitin kinases such as the Casitas B-lineage lymphoma proteins (Cbl-b and c-Cbl), and Itchy (Itch), inhibitory tyrosine phosphatases, such as Src homology region 2 domain-containing phosphatases (SHP-1 and SHP-2), inhibitory protein kinases, such as C-terminal Src kinase (Csk), and inhibitory lipid kinases such as Src homology 2 (SH2) domain-containing inositol polyphosphate 5-phosphatase (SHIP) and Diacylglycerol kinases (DGKs). This review describes the mechanism of action of eighteen intracellular inhibitory regulatory proteins in T cells within these four classes, and assesses their potential value as clinical targets to enhance the anti-tumor activity of endogenous T cells and CAR-T cells.
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9
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Maul J, Alterauge D, Baumjohann D. Micro
RNA
‐mediated regulation of T follicular helper and T follicular regulatory cell identity. Immunol Rev 2019; 288:97-111. [DOI: 10.1111/imr.12735] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Accepted: 12/21/2018] [Indexed: 12/25/2022]
Affiliation(s)
- Julia Maul
- Institute for ImmunologyBiomedical CenterLudwig‐Maximilians‐Universität München Planegg‐Martinsried Germany
| | - Dominik Alterauge
- Institute for ImmunologyBiomedical CenterLudwig‐Maximilians‐Universität München Planegg‐Martinsried Germany
| | - Dirk Baumjohann
- Institute for ImmunologyBiomedical CenterLudwig‐Maximilians‐Universität München Planegg‐Martinsried Germany
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10
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Hibbs ML, Raftery AL, Tsantikos E. Regulation of hematopoietic cell signaling by SHIP-1 inositol phosphatase: growth factors and beyond. Growth Factors 2018; 36:213-231. [PMID: 30764683 DOI: 10.1080/08977194.2019.1569649] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
SHIP-1 is a hematopoietic-specific inositol phosphatase activated downstream of a multitude of receptors including those for growth factors, cytokines, antigen, immunoglobulin and toll-like receptor agonists where it exerts inhibitory control. While it is constitutively expressed in all immune cells, SHIP-1 expression is negatively regulated by the inflammatory and oncogenic micro-RNA miR-155. Knockout mouse studies have shown the importance of SHIP-1 in various immune cell subsets and have revealed a range of immune-mediated pathologies that are engendered due to loss of SHIP-1's regulatory activity, impelling investigations into the role of SHIP-1 in human disease. In this review, we provide an overview of the literature relating to the role of SHIP-1 in hematopoietic cell signaling and function, we summarize recent reports that highlight the dysregulation of the SHIP-1 pathway in cancers, autoimmune disorders and inflammatory diseases, and lastly we discuss the importance of SHIP-1 in restraining myeloid growth factor signaling.
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Affiliation(s)
- Margaret L Hibbs
- a Department of Immunology and Pathology , Alfred Medical Research and Education Precinct Monash University , Melbourne , Victoria , Australia
| | - April L Raftery
- a Department of Immunology and Pathology , Alfred Medical Research and Education Precinct Monash University , Melbourne , Victoria , Australia
| | - Evelyn Tsantikos
- a Department of Immunology and Pathology , Alfred Medical Research and Education Precinct Monash University , Melbourne , Victoria , Australia
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11
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Inácio DP, Amado T, Silva-Santos B, Gomes AQ. Control of T cell effector functions by miRNAs. Cancer Lett 2018; 427:63-73. [PMID: 29679611 DOI: 10.1016/j.canlet.2018.04.011] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2018] [Revised: 03/23/2018] [Accepted: 04/10/2018] [Indexed: 12/12/2022]
Abstract
The differentiation of effector T cells is a tightly regulated process that relies on the selective expression of lineage-defining master regulators that orchestrate unique transcriptional programs, including the production of distinct sets of effector cytokines. miRNAs are post-transcriptional regulators that are now viewed as critical players in these gene expression networks and help defining cell identity and function. This review summarises the role of individual miRNAs in the regulation of the differentiation of effector T cell subsets, including CD4+ T helper cells, cytotoxic CD8+ T cells and innate-like NKT cells. Moreover, we refer to miRNAs that have been identified to affect simultaneously two or more effector T cell populations, impacting on the balance between effector T cells in vivo, thus constituting potential biomarkers or targets for therapies aiming at boosting immunity or controlling autoimmunity.
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Affiliation(s)
- Daniel P Inácio
- Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, 1649-028, Lisboa, Portugal
| | - Tiago Amado
- Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, 1649-028, Lisboa, Portugal
| | - Bruno Silva-Santos
- Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, 1649-028, Lisboa, Portugal
| | - Anita Q Gomes
- Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, 1649-028, Lisboa, Portugal; Escola Superior de Tecnologia da Saúde de Lisboa, 1990-096, Lisboa, Portugal.
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12
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Hope JL, Stairiker CJ, Spantidea PI, Gracias DT, Carey AJ, Fike AJ, van Meurs M, Brouwers-Haspels I, Rijsbergen LC, Fraietta JA, Mueller YM, Klop RC, Stelekati E, Wherry EJ, Erkeland SJ, Katsikis PD. The Transcription Factor T-Bet Is Regulated by MicroRNA-155 in Murine Anti-Viral CD8 + T Cells via SHIP-1. Front Immunol 2017; 8:1696. [PMID: 29358931 PMCID: PMC5765282 DOI: 10.3389/fimmu.2017.01696] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2017] [Accepted: 11/16/2017] [Indexed: 12/21/2022] Open
Abstract
We report here that the expression of the transcription factor T-bet, which is known to be required for effector cytotoxic CD8+ T lymphocytes (CTL) generation and effector memory cell formation, is regulated in CTL by microRNA-155 (miR-155). Importantly, we show that the proliferative effect of miR-155 on CD8+ T cells is mediated by T-bet. T-bet levels in CTL were controlled in vivo by miR-155 via SH2 (Src homology 2)-containing inositol phosphatase-1 (SHIP-1), a known direct target of miR-155, and SHIP-1 directly downregulated T-bet. Our studies reveal an important and unexpected signaling axis between miR-155, T-bet, and SHIP-1 in in vivo CTL responses and suggest an important signaling module that regulates effector CTL immunity.
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Affiliation(s)
- Jennifer L Hope
- Department of Immunology, Erasmus MC University Medical Center, Rotterdam, Netherlands.,Department of Microbiology and Immunology, Drexel University College of Medicine, Philadelphia, PA, United States
| | - Christopher J Stairiker
- Department of Immunology, Erasmus MC University Medical Center, Rotterdam, Netherlands.,Department of Microbiology and Immunology, Drexel University College of Medicine, Philadelphia, PA, United States
| | - Panagiota I Spantidea
- Department of Immunology, Erasmus MC University Medical Center, Rotterdam, Netherlands
| | - Donald T Gracias
- Department of Microbiology and Immunology, Drexel University College of Medicine, Philadelphia, PA, United States
| | - Alison J Carey
- Department of Microbiology and Immunology, Drexel University College of Medicine, Philadelphia, PA, United States.,Department of Pediatrics, Drexel University College of Medicine, Philadelphia, PA, United States
| | - Adam J Fike
- Department of Microbiology and Immunology, Drexel University College of Medicine, Philadelphia, PA, United States
| | - Marjan van Meurs
- Department of Immunology, Erasmus MC University Medical Center, Rotterdam, Netherlands
| | - Inge Brouwers-Haspels
- Department of Immunology, Erasmus MC University Medical Center, Rotterdam, Netherlands
| | - Laurine C Rijsbergen
- Department of Immunology, Erasmus MC University Medical Center, Rotterdam, Netherlands
| | - Joseph A Fraietta
- Center for Cellular Immunotherapies and Abramson Cancer Center, University of Pennsylvania, Philadelphia, PA, United States
| | - Yvonne M Mueller
- Department of Immunology, Erasmus MC University Medical Center, Rotterdam, Netherlands
| | - Rosemarieke C Klop
- Department of Immunology, Erasmus MC University Medical Center, Rotterdam, Netherlands
| | - Erietta Stelekati
- Institute for Immunology, University of Pennsylvania, Philadelphia, PA, United States
| | - E John Wherry
- Institute for Immunology, University of Pennsylvania, Philadelphia, PA, United States
| | - Stefan J Erkeland
- Department of Immunology, Erasmus MC University Medical Center, Rotterdam, Netherlands
| | - Peter D Katsikis
- Department of Immunology, Erasmus MC University Medical Center, Rotterdam, Netherlands
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13
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Davidson D, Zhong MC, Pandolfi PP, Bolland S, Xavier RJ, Seed B, Li X, Gu H, Veillette A. The Csk-Associated Adaptor PAG Inhibits Effector T Cell Activation in Cooperation with Phosphatase PTPN22 and Dok Adaptors. Cell Rep 2017; 17:2776-2788. [PMID: 27926878 DOI: 10.1016/j.celrep.2016.11.035] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2016] [Revised: 10/19/2016] [Accepted: 11/10/2016] [Indexed: 10/20/2022] Open
Abstract
The transmembrane adaptor PAG (Cbp) has been proposed to mediate membrane recruitment of Csk, a cytoplasmic protein tyrosine kinase playing a critical inhibitory role during T cell activation, by inactivating membrane-associated Src kinases. However, this model has not been validated by genetic evidence. Here, we demonstrate that PAG-deficient mice display enhanced T cell activation responses in effector, but not in naive, T cells. PAG-deficient mice also have augmented T cell-dependent autoimmunity and greater resistance to T cell anergy. Interestingly, in the absence of PAG, Csk becomes more associated with alternative partners; i.e., phosphatase PTPN22 and Dok adaptors. Combining PAG deficiency with PTPN22 or Dok adaptor deficiency further enhances effector T cell responses. Unlike PAG, Cbl ubiquitin ligases inhibit the activation of naive, but not of effector, T cells. Thus, Csk-associating PAG is a critical component of the inhibitory machinery controlling effector T cell activation in cooperation with PTPN22 and Dok adaptors.
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Affiliation(s)
- Dominique Davidson
- Laboratory of Molecular Oncology, Institut de recherches cliniques de Montréal, Montréal, QC H2W 1R7, Canada.
| | - Ming-Chao Zhong
- Laboratory of Molecular Oncology, Institut de recherches cliniques de Montréal, Montréal, QC H2W 1R7, Canada
| | - Pier Paolo Pandolfi
- Cancer Research Institute, Beth Israel Deaconess Cancer Center, Boston, MA 02215, USA
| | - Silvia Bolland
- Laboratory of Immunogenetics, National Institute of Allergy and Infectious Diseases, NIH, Rockville, MD 20852, USA
| | - Ramnik J Xavier
- Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA
| | - Brian Seed
- Center for Computational and Integrative Biology, Massachusetts General Hospital, Boston, MA 02114, USA
| | - Xin Li
- Laboratory of Molecular Immunology, Institut de recherches cliniques de Montréal, Montréal, QC H2W 1R7, Canada
| | - Hua Gu
- Laboratory of Molecular Immunology, Institut de recherches cliniques de Montréal, Montréal, QC H2W 1R7, Canada; Department of Medicine, University of Montréal, Montréal, QC H3C 3J7, Canada; Department of Medicine, McGill University, Montréal, QC H3G 1Y6, Canada
| | - André Veillette
- Laboratory of Molecular Oncology, Institut de recherches cliniques de Montréal, Montréal, QC H2W 1R7, Canada; Department of Medicine, University of Montréal, Montréal, QC H3C 3J7, Canada; Department of Medicine, McGill University, Montréal, QC H3G 1Y6, Canada.
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14
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Gumbleton M, Sudan R, Fernandes S, Engelman RW, Russo CM, Chisholm JD, Kerr WG. Dual enhancement of T and NK cell function by pulsatile inhibition of SHIP1 improves antitumor immunity and survival. Sci Signal 2017; 10:10/500/eaam5353. [PMID: 29018171 DOI: 10.1126/scisignal.aam5353] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The success of immunotherapy in some cancer patients has revealed the profound capacity for cytotoxic lymphocytes to eradicate malignancies. Various immunotherapies work by blocking key checkpoint proteins that suppress immune cell activity. The phosphatase SHIP1 (SH2-containing inositol polyphosphate 5-phosphatase) limits signaling from receptors that activate natural killer (NK) cells and T cells. However, unexpectedly, genetic ablation studies have shown that the effector functions of SHIP1-deficient NK and T cells are compromised in vivo. Because chronic activation of immune cells renders them less responsive to activating signals (a host mechanism to avoid autoimmunity), we hypothesized that the failure of SHIP1 inhibition to induce antitumor immunity in those studies was caused by the permanence of genetic ablation. Accordingly, we found that reversible and pulsatile inhibition of SHIP1 with 3-α-aminocholestane (3AC; "SHIPi") increased the antitumor response of NK and CD8+ T cells in vitro and in vivo. Transient SHIP1 inhibition in mouse models of lymphoma and colon cancer improved the median and long-term tumor-free survival rates. Adoptive transfer assays showed evidence of immunological memory to the tumor in hematolymphoid cells from SHIPi-treated, long-term surviving mice. The findings suggest that a pulsatile regimen of SHIP1 inhibition might be an effective immunotherapy in some cancer patients.
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Affiliation(s)
- Matthew Gumbleton
- Department of Microbiology and Immunology, State University of New York (SUNY) Upstate Medical University, Syracuse, NY 13210, USA
| | - Raki Sudan
- Department of Microbiology and Immunology, State University of New York (SUNY) Upstate Medical University, Syracuse, NY 13210, USA
| | - Sandra Fernandes
- Department of Microbiology and Immunology, State University of New York (SUNY) Upstate Medical University, Syracuse, NY 13210, USA
| | - Robert W Engelman
- Department of Pathology and Cell Biology, University of South Florida, Tampa, FL 33612, USA.,Department of Pediatrics, University of South Florida, Tampa, FL 33612, USA.,H. Lee Moffitt Comprehensive Cancer Center and Research Institute, University of South Florida, Tampa, FL 33612, USA
| | | | - John D Chisholm
- Department of Chemistry, Syracuse University, Syracuse, NY 13210, USA
| | - William G Kerr
- Department of Microbiology and Immunology, State University of New York (SUNY) Upstate Medical University, Syracuse, NY 13210, USA. .,Department of Chemistry, Syracuse University, Syracuse, NY 13210, USA.,Department of Pediatrics, SUNY Upstate Medical University, Syracuse, NY 13210, USA.,Centre d'Immunologie de Marseille-Luminy, Marseille, France
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15
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Coelho-Lima J, Spyridopoulos I. Non-coding RNA regulation of T cell biology: Implications for age-associated cardiovascular diseases. Exp Gerontol 2017; 109:38-46. [PMID: 28652179 DOI: 10.1016/j.exger.2017.06.014] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Revised: 06/19/2017] [Accepted: 06/20/2017] [Indexed: 01/26/2023]
Abstract
Prevalence of age-associated cardiovascular diseases (CVD) has dramatically increased as a result of improvements in life expectancy. Chronic inflammation is a shared pathophysiological feature of age-associated CVDs, indicating a role for the immune system in the onset and development of CVDs. Indeed, ageing elicits profound changes in both the cardiovascular and immune system, especially in the T cell compartment. Although such changes have been well described at the cellular level, the molecular mechanisms underlying immune-mediated cardiovascular ageing remain largely unexplored. Non-coding RNAs (ncRNAs) comprise a heterogeneous family of RNA transcripts that regulate gene expression at the epigenetic, transcriptional, post-transcriptional, and post-translational levels. Non-coding RNAs have recently emerged as master modulators of T cell immunity. In this review, the state-of-the-art knowledge on ncRNA regulatory effects over T cell differentiation, function, and ageing in the context of age-associated CVDs, such as atherosclerosis, acute coronary syndromes, and heart failure, is discussed.
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Affiliation(s)
- Jose Coelho-Lima
- Institute of Genetic Medicine, Newcastle University, International Centre for Life, Central Parkway, Newcastle upon Tyne NE1 3BZ, United Kingdom
| | - Ioakim Spyridopoulos
- Institute of Genetic Medicine, Newcastle University, International Centre for Life, Central Parkway, Newcastle upon Tyne NE1 3BZ, United Kingdom; Freeman Hospital, Newcastle upon Tyne NHS Foundation Trust, Freeman Road, High Heaton, Newcastle upon Tyne NE7 7DN, United Kingdom.
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16
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Pauls SD, Marshall AJ. Regulation of immune cell signaling by SHIP1: A phosphatase, scaffold protein, and potential therapeutic target. Eur J Immunol 2017; 47:932-945. [PMID: 28480512 DOI: 10.1002/eji.201646795] [Citation(s) in RCA: 79] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2017] [Revised: 03/06/2017] [Accepted: 05/03/2017] [Indexed: 02/06/2023]
Abstract
The phosphoinositide phosphatase SHIP is a critical regulator of immune cell activation. Despite considerable study, the mechanisms controlling SHIP activity to ensure balanced cell activation remain incompletely understood. SHIP dampens BCR signaling in part through its association with the inhibitory coreceptor Fc gamma receptor IIB, and serves as an effector for other inhibitory receptors in various immune cell types. The established paradigm emphasizes SHIP's inhibitory receptor-dependent function in regulating phosphoinositide 3-kinase signaling by dephosphorylating the phosphoinositide PI(3,4,5)P3 ; however, substantial evidence indicates that SHIP can be activated independently of inhibitory receptors and can function as an intrinsic brake on activation signaling. Here, we integrate historical and recent reports addressing the regulation and function of SHIP in immune cells, which together indicate that SHIP acts as a multifunctional protein controlled by multiple regulatory inputs, and influences downstream signaling via both phosphatase-dependent and -independent means. We further summarize accumulated evidence regarding the functions of SHIP in B cells, T cells, NK cells, dendritic cells, mast cells, and macrophages, and data suggesting defective expression or activity of SHIP in autoimmune and malignant disorders. Lastly, we discuss the biological activities, therapeutic promise, and limitations of small molecule modulators of SHIP enzymatic activity.
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Affiliation(s)
- Samantha D Pauls
- Department of Immunology, University of Manitoba, Winnipeg, Canada
| | - Aaron J Marshall
- Department of Immunology, University of Manitoba, Winnipeg, Canada
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17
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Therapeutic effects of Euphorbia Pekinensis and Glycyrrhiza glabra on Hepatocellular Carcinoma Ascites Partially Via Regulating the Frk-Arhgdib-Inpp5d-Avpr2-Aqp4 Signal Axis. Sci Rep 2017; 7:41925. [PMID: 28165501 PMCID: PMC5292954 DOI: 10.1038/srep41925] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2016] [Accepted: 01/05/2017] [Indexed: 01/18/2023] Open
Abstract
To clarify unknown rationalities of herbaceous compatibility of Euphorbia Pekinensis (DJ) and Glycyrrhiza glabra (GC) acting on hepatocellular carcinoma (HCC) ascites, peritoneum transcriptomics profiling of 15 subjects, including normal control (Con), HCC ascites mouse model (Mod), DJ-alone, DJ/GC-synergy and DJ/GC-antagonism treatment groups were performed on OneArray platform, followed by differentially expressed genes (DEGs) screening. DEGs between Mod and Con groups were considered as HCC ascites-related genes, and those among different drug treatment and Mod groups were identified as DJ/GC-combination-related genes. Then, an interaction network of HCC ascites-related gene-DJ/GC combination-related gene-known therapeutic target gene for ascites was constructed. Based on nodes’ degree, closeness, betweenness and k-coreness, the Frk-Arhgdib-Inpp5d-Avpr2-Aqp4 axis with highly network topological importance was demonstrated to be a candidate target of DJ/GC combination acting on HCC ascites. Importantly, both qPCR and western blot analyses verified this regulatory effects based on HCC ascites mice in vivo and M-1 collecting duct cells in vitro. Collectively, different combination designs of DJ and GC may lead to synergistic or antagonistic effects on HCC ascites partially via regulating the Frk-Arhgdib-Inpp5d-Avpr2-Aqp4 axis, implying that global gene expression profiling combined with network analysis can offer an effective way to understand pharmacological mechanisms of traditional Chinese medicine prescriptions.
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18
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Juric MK, Shevtsov M, Mozes P, Ogonek J, Crossland RE, Dickinson AM, Greinix HT, Holler E, Weissinger EM, Multhoff G. B-Cell-Based and Soluble Biomarkers in Body Liquids for Predicting Acute/Chronic Graft-versus-Host Disease after Allogeneic Hematopoietic Stem Cell Transplantation. Front Immunol 2017; 7:660. [PMID: 28138325 PMCID: PMC5238459 DOI: 10.3389/fimmu.2016.00660] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2016] [Accepted: 12/16/2016] [Indexed: 02/02/2023] Open
Abstract
Allogeneic hematopoietic stem cell transplantation (allo-HSCT) is the main curative therapy for hematological malignancy such as leukemias, lymphomas, or multiple myelomas and some other hematological disorders. In this therapy, cure of hematological diseases relies on graft-versus-malignancy effects by allogenic immune cells. However, severe posttransplant treatment-associated complications such as acute graft-versus-host disease (aGvHD) and chronic graft-versus-host disease (cGvHD) limit this approach. Most research into GvHD has concentrated on the aGvHD, while the more complex and multifaceted chronic form has been largely poorly investigated. cGvHD is a multi-organ autoimmune disorder and is the major cause of non-relapse morbidity and mortality following allo-HSCT, occurring in about 50% of patients, or 13,000–15,000 patients per year worldwide. Therefore, there is a high medical need for an early prediction of these therapy-associated toxicities. Biomarkers have gained importance over the last decade in diagnosis, in prognosis, and in prediction of pending diseases or side effects. Biomarkers can be cells, factors isolated from target tissues, or soluble factors that can be detected in body fluids. In this review, we aim to summarize some of the recent developments of biomarkers in the field of allo-HSCT. We will focus on cell-based biomarkers (B-cell subsets) for cGvHD and soluble factors including microRNA (miRNA), which are excreted into serum/plasma and urine. We also discuss the potential role of cytosolic and extracellular 70 kDa heat shock proteins (HSP70) as potential biomarkers for aGvHD and their role in preclinical models. Proteomic biomarkers in the blood have been used as predictors of treatment responses in patients with aGvHD for many years. More recently, miRNAs have been found to serve as a biomarker to diagnose aGvHD in the plasma. Another development relates to urine-based biomarkers that are usually detected by capillary electrophoresis and mass spectrometry. These biomarkers have the potential to predict the development of severe aGvHD (grades III–IV), overall mortality, and the pending development of cGvHD in patients posttransplant.
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Affiliation(s)
- Mateja Kralj Juric
- Department of Internal Medicine I, BMT, Medical University of Vienna , Vienna , Austria
| | - Maxim Shevtsov
- Department of Radiation Oncology, Klinikum rechts der Isar, Technische Universität München , Munich , Germany
| | - Petra Mozes
- Department of Radiation Oncology, Klinikum rechts der Isar, Technische Universität München , Munich , Germany
| | - Justyna Ogonek
- Department of Hematology, Hemostasis, Oncology and Stem Cell Transplantation, Transplantation Biology, Hannover Medical School , Hannover , Germany
| | - Rachel E Crossland
- Hematological Sciences, Institute of Cellular Medicine, Newcastle University , Newcastle upon Tyne , UK
| | - Anne M Dickinson
- Hematological Sciences, Institute of Cellular Medicine, Newcastle University , Newcastle upon Tyne , UK
| | | | - Ernst Holler
- Department of Internal Medicine III, University Hospital of Regensburg , Regensburg , Germany
| | - Eva M Weissinger
- Department of Hematology, Hemostasis, Oncology and Stem Cell Transplantation, Transplantation Biology, Hannover Medical School , Hannover , Germany
| | - Gabriele Multhoff
- Department of Radiation Oncology, Klinikum rechts der Isar, Technische Universität München , Munich , Germany
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19
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Bunse CE, Tischer S, Lahrberg J, Oelke M, Figueiredo C, Blasczyk R, Eiz-Vesper B. Granulocyte colony-stimulating factor impairs CD8(+) T cell functionality by interfering with central activation elements. Clin Exp Immunol 2016; 185:107-18. [PMID: 26990855 DOI: 10.1111/cei.12794] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/14/2016] [Indexed: 12/17/2022] Open
Abstract
Besides mobilizing stem cells into the periphery, granulocyte colony-stimulating factor (G-CSF) has been shown to influence various types of innate and adaptive immune cells. For example, it impairs the effector function of cytotoxic T lymphocytes (CTLs). It is assumed that this effect is mediated indirectly by monocytes, regulatory T cells and immunomodulatory cytokines influenced by G-CSF. In this study, isolated G-CSF-treated CD8(+) T cells were stimulated antigen-dependently with peptide-major histocompatibility complex (pMHC)-coupled artificial antigen-presenting cells (aAPCs) or stimulated antigen-independently with anti-CD3/CD28 stimulator beads. By measuring the changes in interferon (IFN)-γ and granzyme B expression at the mRNA and protein level, we showed for the first time that G-CSF has a direct effect on CD8(+) CTLs, which was confirmed based on the reduced production of IFN-γ and granzyme B by the cytotoxic T cell line TALL-104 after G-CSF treatment. By investigating further elements affected by G-CSF in CTLs from stem cell donors and untreated controls, we found a decreased phosphorylation of extracellular-regulated kinase (ERK)1/2, lymphocyte-specific protein tyrosine kinase (Lck) and CD3ζ after G-CSF treatment. Additionally, miRNA-155 and activation marker expression levels were reduced. In summary, our results show that G-CSF directly influences the effector function of cytotoxic CD8(+) T cells and affects various elements of T cell activation.
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Affiliation(s)
- C E Bunse
- Institute for Transfusion Medicine.,Integrated Research and Treatment Centre Transplantation (IFB-Tx), Hannover Medical School, Hannover, Germany
| | - S Tischer
- Institute for Transfusion Medicine.,Integrated Research and Treatment Centre Transplantation (IFB-Tx), Hannover Medical School, Hannover, Germany
| | | | - M Oelke
- Department of Pathology, Johns Hopkins School of Medicine, Baltimore, MD, USA
| | | | - R Blasczyk
- Institute for Transfusion Medicine.,Integrated Research and Treatment Centre Transplantation (IFB-Tx), Hannover Medical School, Hannover, Germany
| | - B Eiz-Vesper
- Institute for Transfusion Medicine.,Integrated Research and Treatment Centre Transplantation (IFB-Tx), Hannover Medical School, Hannover, Germany
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20
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Emerging Roles for MicroRNAs in T Follicular Helper Cell Differentiation. Trends Immunol 2016; 37:297-309. [PMID: 27068008 DOI: 10.1016/j.it.2016.03.003] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2016] [Revised: 03/03/2016] [Accepted: 03/13/2016] [Indexed: 01/07/2023]
Abstract
T follicular helper (Tfh) cells are essential for the formation of germinal centers (GCs) and the development of long-lived humoral immunity. Tfh cell differentiation is a multistep process driven by the balanced expression of key transcription factors that form a regulatory network in which small changes in gene expression determine the Tfh cell fate decision. Here, we review recent findings that have revealed that certain microRNAs act as important mediators within this network, with roles in tuning gene expression. We integrate these findings into the current understanding of the mechanisms governing T helper cell differentiation, and propose a model in which the establishment of Tfh cell identity is dependent on the differential expression and concerted action of distinct microRNAs and transcription factors.
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21
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Regulation of PtdIns(3,4,5)P3/Akt signalling by inositol polyphosphate 5-phosphatases. Biochem Soc Trans 2016; 44:240-52. [DOI: 10.1042/bst20150214] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The phosphoinositide 3-kinase (PI3K) generated lipid signals, PtdIns(3,4,5)P3 and PtdIns(3,4)P2, are both required for the maximal activation of the serine/threonine kinase proto-oncogene Akt. The inositol polyphosphate 5-phosphatases (5-phosphatases) hydrolyse the 5-position phosphate from the inositol head group of PtdIns(3,4,5)P3 to yield PtdIns(3,4)P2. Extensive work has revealed several 5-phosphatases inhibit PI3K-driven Akt signalling, by decreasing PtdIns(3,4,5)P3 despite increasing cellular levels of PtdIns(3,4)P2. The roles that 5-phosphatases play in suppressing cell proliferation and transformation are slow to emerge; however, the 5-phosphatase PIPP [proline-rich inositol polyphosphate 5-phosphatase; inositol polyphosphate 5-phosphatase (INPP5J)] has recently been identified as a putative tumour suppressor in melanoma and breast cancer and SHIP1 [SH2 (Src homology 2)-containing inositol phosphatase 1] inhibits haematopoietic cell proliferation. INPP5E regulates cilia stability and INPP5E mutations have been implicated ciliopathy syndromes. This review will examine 5-phosphatase regulation of PI3K/Akt signalling, focussing on the role PtdIns(3,4,5)P3 5-phosphatases play in developmental diseases and cancer.
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22
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Gold MJ, Antignano F, Hughes MR, Zaph C, McNagny KM. Dendritic-cell expression ofShip1regulates Th2 immunity to helminth infection in mice. Eur J Immunol 2015; 46:122-30. [DOI: 10.1002/eji.201545628] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2015] [Revised: 09/15/2015] [Accepted: 10/15/2015] [Indexed: 11/07/2022]
Affiliation(s)
- Matthew J. Gold
- Biomedical Research Centre; University of British Columbia; Vancouver Canada
| | - Frann Antignano
- Biomedical Research Centre; University of British Columbia; Vancouver Canada
| | - Michael R. Hughes
- Biomedical Research Centre; University of British Columbia; Vancouver Canada
| | - Colby Zaph
- Biomedical Research Centre; University of British Columbia; Vancouver Canada
- Infection and Immunity Program; Monash Biomedicine Discovery Institute
- Department of Biochemistry and Molecular Biology; Monash University; Clayton Australia
| | - Kelly M. McNagny
- Biomedical Research Centre; University of British Columbia; Vancouver Canada
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23
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Xie W, Li P, Wang Z, Chen J, Lin Z, Liang X, Mo Y. Rosuvastatin may reduce the incidence of cardiovascular events in patients with acute coronary syndromes receiving percutaneous coronary intervention by suppressing miR-155/SHIP-1 signaling pathway. Cardiovasc Ther 2015; 32:276-82. [PMID: 25319951 DOI: 10.1111/1755-5922.12098] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
PURPOSE The beneficial effect of rosuvastatin against percutaneous coronary intervention (PCI) related procedural myocardial injury has been determined mostly in patients with acute coronary syndromes (ACS). However, the detailed therapeutic mechanism has not been well studied. METHODS Patients with ACS receiving PCI (n = 159) were randomized to control group (placebo treatment) or to rosuvastatin group (20 mg 12 h before PCI, and a further 20 mg 2 h preprocedure dose). Levels of INF-γ, TNF-α, IL-6, miR-155/SHIP-1, and CD4(+)FoxP3(+)Treg in peripheral blood were detected before PCI and 24 h after PCI. Clinical data of these patients were also collected in this prospective study. RESULTS Compared with placebo, rosuvastatin treatment significantly reduced the incidence of periprocedural myocardial infarction (PMI) and levels of cardiac troponin I (cTnI) associated with decreased relative expression of serum miR-155, levels of inflammatory cytokines (INF-γ, TNF-α, and IL-6), increased SHIP-1 expression and CD4(+)FoxP3(+)Treg percentage values (P < 0.05). In addition, patients with rosuvastatin pretreatment also reduced incidence of 30 days major adverse cardiac events (MACE) compared to the patients with placebo treatment (16 patients vs. 28 patients, P = 0.038). CONCLUSIONS Our study suggests that high loading dose rosuvastatin pretreatment may reduce the incidence of cardiovascular events and levels of inflammatory markers in patients with ACS receiving PCI, which may be explained at least in part, by mechanism involving suppression of miR-155/SHIP-1 signaling pathway.
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Affiliation(s)
- Wenchao Xie
- Department of Cardiology, Yulin First People's Hospital, Sixth Affiliated Hospital of Guangxi Medical University, Yulin, Guangxi, China
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24
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Anderson CK, Salter AI, Toussaint LE, Reilly EC, Fugère C, Srivastava N, Kerr WG, Brossay L. Role of SHIP1 in Invariant NKT Cell Development and Functions. THE JOURNAL OF IMMUNOLOGY 2015; 195:2149-2156. [PMID: 26232432 DOI: 10.4049/jimmunol.1500567] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2015] [Accepted: 07/07/2015] [Indexed: 11/19/2022]
Abstract
SHIP1 is a 5'-inositol phosphatase known to negatively regulate the signaling product of the PI3K pathway, phosphatidylinositol (3-5)-trisphosphate. SHIP1 is recruited to a large number of inhibitory receptors expressed on invariant NK (iNKT) cells. We hypothesized that SHIP1 deletion would have major effects on iNKT cell development by altering the thresholds for positive and negative selection. Germline SHIP1 deletion has been shown to affect T cells as well as other immune cell populations. However, the role of SHIP1 on T cell function has been controversial, and its participation on iNKT cell development and function has not been examined. We evaluated the consequences of SHIP1 deletion on iNKT cells using germline-deficient mice, chimeric mice, and conditionally deficient mice. We found that T cell and iNKT cell development are impaired in germline-deficient animals. However, this phenotype can be rescued by extrinsic expression of SHIP1. In contrast, SHIP1 is required cell autonomously for optimal iNKT cell cytokine secretion. This suggests that SHIP1 calibrates the threshold of iNKT cell reactivity. These data further our understanding of how iNKT cell activation is regulated and provide insights into the biology of this unique cell lineage.
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Affiliation(s)
- Courtney K Anderson
- Department of Molecular Microbiology & Immunology, Division of Biology and Medicine, Brown University, Providence, RI 02912
| | - Alexander I Salter
- Department of Molecular Microbiology & Immunology, Division of Biology and Medicine, Brown University, Providence, RI 02912
| | - Leon E Toussaint
- Department of Molecular Microbiology & Immunology, Division of Biology and Medicine, Brown University, Providence, RI 02912
| | - Emma C Reilly
- Department of Molecular Microbiology & Immunology, Division of Biology and Medicine, Brown University, Providence, RI 02912
| | - Céline Fugère
- Department of Molecular Microbiology & Immunology, Division of Biology and Medicine, Brown University, Providence, RI 02912
| | - Neetu Srivastava
- Departments of Pediatrics and Microbiology & Immunology, SUNY Upstate Medical University, Syracuse, NY 13210
| | - William G Kerr
- Departments of Pediatrics and Microbiology & Immunology, SUNY Upstate Medical University, Syracuse, NY 13210.,Chemistry Department, Syracuse University, Syracuse, NY 13210
| | - Laurent Brossay
- Department of Molecular Microbiology & Immunology, Division of Biology and Medicine, Brown University, Providence, RI 02912
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25
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Song J, Lee JE. miR-155 is involved in Alzheimer's disease by regulating T lymphocyte function. Front Aging Neurosci 2015; 7:61. [PMID: 25983691 PMCID: PMC4415416 DOI: 10.3389/fnagi.2015.00061] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2014] [Accepted: 04/09/2015] [Indexed: 12/28/2022] Open
Abstract
Alzheimer’s disease (AD) is considered the most common cause of sporadic dementia. In AD, adaptive and innate immune responses play a crucial role in clearance of amyloid beta and maintenance of cognitive functions. In addition to other changes in the immune system, AD alters the T-cell responses that affect activation of glial cells, neuronal cells, macrophages, and secretion of pro-inflammatory cytokines. These changes in the immune system influence AD pathogenesis. Micro-RNA (miRNA)-155 is a multifunctional miRNA with a distinct expression profile. It is involved in diverse physiological and pathological mechanisms, such as immunity and inflammation. Recent studies indicate that miR-155 regulates T-cell functions during inflammation. In this article, we summarize recent studies describing the therapeutic potential of miR-155 via regulation of T cells in AD. Further, we propose that regulation of miR-155 might be a new protective approach against AD pathogenesis.
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Affiliation(s)
- Juhyun Song
- Department of Anatomy, Yonsei University College of Medicine Seoul, South Korea
| | - Jong Eun Lee
- Department of Anatomy, Yonsei University College of Medicine Seoul, South Korea ; Brain Korea 21 Plus Project for Medical Science and Brain Research Institute, Yonsei University College of Medicine Seoul, South Korea
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26
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Bhela S, Mulik S, Gimenez F, Reddy PBJ, Richardson RL, Varanasi SK, Jaggi U, Xu J, Lu PY, Rouse BT. Role of miR-155 in the pathogenesis of herpetic stromal keratitis. THE AMERICAN JOURNAL OF PATHOLOGY 2015; 185:1073-84. [PMID: 25700796 PMCID: PMC4380872 DOI: 10.1016/j.ajpath.2014.12.021] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2014] [Revised: 12/12/2014] [Accepted: 12/18/2014] [Indexed: 12/21/2022]
Abstract
Ocular infection with herpes simplex virus 1 can result in a chronic immunoinflammatory stromal keratitis (SK) lesion that is a significant cause of human blindness. A key to controlling SK lesion severity is to identify cellular and molecular events responsible for tissue damage and to manipulate them therapeutically. Potential targets for therapy are miRNAs, but these are minimally explored especially in responses to infection. Here, we demonstrated that Mir155 expression was up-regulated after ocular herpes simplex virus 1 infection, with the increased Mir155 expression occurring mainly in macrophages and CD4(+) T cells and to a lesser extent in neutrophils. In vivo studies indicated that Mir155 knockout mice were more resistant to herpes SK with marked suppression of T helper cells type 1 and 17 responses both in the ocular lesions and the lymphoid organs. The reduced SK lesion severity was reflected by increased phosphatidylinositol-3,4,5-trisphosphate 5-phosphatase 1 and interferon-γ receptor α-chain levels in activated CD4(+) T cells in the lymph nodes. Finally, in vivo silencing of miR-155 by the provision of antagomir-155 nanoparticles to herpes simplex virus 1-infected mice led to diminished SK lesions and corneal vascularization. In conclusion, our results indicate that miR-155 contributes to the pathogenesis of SK and represents a promising target to control SK severity.
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Affiliation(s)
- Siddheshvar Bhela
- Department of Biomedical and Diagnostic Sciences, College of Veterinary Medicine, University of Tennessee, Knoxville, Tennessee
| | - Sachin Mulik
- Department of Biomedical and Diagnostic Sciences, College of Veterinary Medicine, University of Tennessee, Knoxville, Tennessee; Immune Disease Institute and Program in Cellular and Molecular Medicine, Children's Hospital Boston, Harvard Medical School, Boston, Massachusetts
| | - Fernanda Gimenez
- Department of Biomedical and Diagnostic Sciences, College of Veterinary Medicine, University of Tennessee, Knoxville, Tennessee
| | - Pradeep B J Reddy
- Department of Biomedical and Diagnostic Sciences, College of Veterinary Medicine, University of Tennessee, Knoxville, Tennessee; Department of Microbiology and Immunology, Yerkes National Primate Research Center, Emory University, Atlanta, Georgia
| | - Raphael L Richardson
- Department of Biomedical and Diagnostic Sciences, College of Veterinary Medicine, University of Tennessee, Knoxville, Tennessee
| | - Siva Karthik Varanasi
- Department of Genome Science and Technology, University of Tennessee, Knoxville, Tennessee
| | - Ujjaldeep Jaggi
- Department of Biomedical and Diagnostic Sciences, College of Veterinary Medicine, University of Tennessee, Knoxville, Tennessee
| | - John Xu
- Sirnaomics, Inc., Gaithersburg, Maryland
| | | | - Barry T Rouse
- Department of Biomedical and Diagnostic Sciences, College of Veterinary Medicine, University of Tennessee, Knoxville, Tennessee.
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Gold MJ, Hughes MR, Antignano F, Hirota JA, Zaph C, McNagny KM. Lineage-specific regulation of allergic airway inflammation by the lipid phosphatase Src homology 2 domain-containing inositol 5-phosphatase (SHIP-1). J Allergy Clin Immunol 2015; 136:725-736.e2. [PMID: 25746967 DOI: 10.1016/j.jaci.2015.01.019] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2014] [Revised: 12/17/2014] [Accepted: 01/21/2015] [Indexed: 12/24/2022]
Abstract
BACKGROUND Inpp5d (Src homology 2 domain-containing inositol-5-phosphatase [Ship1])-deficient mice experience spontaneous airway inflammation and have enhanced sensitivity to allergen-induced airway inflammation. OBJECTIVE We hypothesized that lineage-specific deletion of Ship1 expression in cells known to be crucial for adaptive TH2 responses would uncover distinct roles that could either positively or negatively regulate susceptibility to allergic airway inflammation (AAI). METHODS Ship1 expression was deleted in B cells, T cells, or dendritic cells (DCs), and the resulting Ship1(ΔB cell), Ship1(ΔT cell), Ship1(ΔDC), or Ship1(F/F) (wild-type) control mice were evaluated in a model of house dust mite (HDM)-induced AAI. RESULTS Unlike germline panhematopoietic Ship1 deletion, deletion of Ship1 selectively in either the B-cell, T-cell, or DC lineages did not result in spontaneous airway inflammation. Strikingly, although loss of Ship1 in the B-cell lineage did not affect HDM-induced AAI, loss of Ship1 in either of the T-cell or DC lineages protected mice from AAI by skewing the typical TH2 immune response toward a TH1 response. CONCLUSIONS Although panhematopoietic deletion of Ship1 leads to spontaneous lung inflammation, selective deletion of Ship1 in T cells or DCs impairs the formation of an adaptive TH2 response and protects animals from HDM-induced AAI.
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Affiliation(s)
- Matthew J Gold
- The Biomedical Research Centre, University of British Columbia, Vancouver, British Columbia, Canada
| | - Michael R Hughes
- The Biomedical Research Centre, University of British Columbia, Vancouver, British Columbia, Canada
| | - Frann Antignano
- The Biomedical Research Centre, University of British Columbia, Vancouver, British Columbia, Canada
| | - Jeremy A Hirota
- UBC James Hogg Research Centre, St Paul's Hospital, Vancouver, British Columbia, Canada
| | - Colby Zaph
- The Biomedical Research Centre, University of British Columbia, Vancouver, British Columbia, Canada; Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, British Columbia, Canada; Department of Biochemistry and Molecular Biology, Monash University, Clayton, Australia
| | - Kelly M McNagny
- The Biomedical Research Centre, University of British Columbia, Vancouver, British Columbia, Canada.
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Abstract
Induction of specific immune tolerance to grafts remains the sought-after standard following transplantation. Defined by expression of the Foxp3 (forkhead box protein 3) transcription factor, the regulatory T-cell (Treg) lineage has been noted to exert potent immunoregulatory functions that contribute to specific graft tolerance. In this review, we discuss the known signals and pathways which govern Treg development, both in the thymus and in peripheral sites, as well as lineage maintenance and homeostasis. In particular, we highlight the roles of T-cell receptor signaling, CD28 costimulation, and signals through phosphatidyl inositol 3-kinase (PI3K) and related metabolic pathways in multiple aspects of Treg biology.
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Affiliation(s)
- Alexandria Huynh
- Division of Medical Sciences, Harvard Medical School, Boston, MA, USA; Transplantation Biology Research Center, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
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Gumbleton M, Vivier E, Kerr WG. SHIP1 intrinsically regulates NK cell signaling and education, resulting in tolerance of an MHC class I-mismatched bone marrow graft in mice. THE JOURNAL OF IMMUNOLOGY 2015; 194:2847-54. [PMID: 25687756 DOI: 10.4049/jimmunol.1402930] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
NK cells are an important component of host immune defense against malignancy and infection. NK cells are educated by MHC class I ligands to ensure self-tolerance while also promoting lytic competency against altered self and damaged self targets. However, the intracellular molecular events that culminate in tolerance and functional competency of educated NK cells remain undefined. Mice with germline deficiency in SHIP1 were shown to have a defective NK cell compartment. However, SHIP1 is expressed in all hematopoietic lineages, and consequently several hematolymphoid phenotypes have already been identified in certain cell types that are the result of SHIP1 deficiency in cells in separate and distinct lineages, that is, cell-extrinsic phenotypes. Thus, it was previously impossible to determine the NK cell-intrinsic role of SHIP1. In the present study, through the creation of an NK cell-specific deletion mouse model of SHIP1, we show that SHIP1 plays a profound NK lineage-intrinsic role in NK cell homeostasis, development, education, and cytokine production. Moreover, we show SHIP1 expression by NK cells is required for in vivo-mismatched bone marrow allograft rejection as well as for NK memory responses to hapten.
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Affiliation(s)
- Matthew Gumbleton
- Department of Microbiology and Immunology, State University of New York Upstate Medical University, Syracuse, NY 13210
| | - Eric Vivier
- Centre d'Immunologie de Marseille-Luminy, Aix-Marseille University Unité Mixte 2, 13288 Marseille, France; INSERM Unité 1104, 13288 Marseille, France; Centre National de la Recherche Scientifique Unité Mixte de Recherche 7280, 13288 Marseille, France; Service d'Immunologie, Assistance Publique-Hôpitaux de Marseille, Hôpital de la Conception, 13385 Marseille, France
| | - William G Kerr
- Department of Microbiology and Immunology, State University of New York Upstate Medical University, Syracuse, NY 13210; Department of Pediatrics, State University of New York Upstate Medical University, Syracuse, NY 13210; and Department of Chemistry, Syracuse University, Syracuse, NY 13210
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30
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Abstract
During an immune response, CD8(+)T cells can differentiate into multiple types of effector and memory cells that are important components of immune surveillance. However, their dysregulation has been implicated in infection with viruses or intracellular bacteria and tumorigenesis. miRNAs have been identified as crucial regulators of gene expression, and they perform this function by repressing specific target genes at the post-transcriptional level. Most miRNAs expressed in a given cell type serve the function to impede broadly cell-type-inappropriate gene expression and potently deepen a pre-existing differentiation program. It is increasingly recognized that miRNAs directly modulate the concentration of many regulatory proteins that are required for the development of immune cells in the thymus and their responses in the periphery. This review outlines our current understanding of the function of miRNAs in CD8(+)T cell biology as it impacts expression of protein-coding genes in the context of proper development, infection, as well as oncogenesis. In addition, we conclude with a perspective on future challenges and the clinical relevance of miRNA biology.
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Affiliation(s)
- Yan Liang
- Department of Epidemiology and Biostatistics, School of Public Health, Anhui Medical University, Hefei, Anhui, PR China
| | - Hai-Feng Pan
- Department of Epidemiology and Biostatistics, School of Public Health, Anhui Medical University, Hefei, Anhui, PR China
| | - Dong-Qing Ye
- Department of Epidemiology and Biostatistics, School of Public Health, Anhui Medical University, Hefei, Anhui, PR China
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31
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Li X, Rendon JL, Choudhry MA. T cell IFN-γ suppression following alcohol and burn injury is independent of miRNA155. PLoS One 2014; 9:e105314. [PMID: 25126745 PMCID: PMC4134308 DOI: 10.1371/journal.pone.0105314] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2014] [Accepted: 07/21/2014] [Indexed: 12/15/2022] Open
Abstract
miRNA155 has been implicated in normal T cell function and their differentiations into the Th1 subtype. We have shown that acute alcohol (ethanol) intoxication combined with burn injury suppresses T cell IFN-γ release. Herein, we examined whether the decrease in IFN-γ is resulted from altered expression of miRNA155 and transcription factors--NFAT, Tbx21, Jun and Fos--in T cells following ethanol and burn injury. Mice received ethanol (∼3 g/Kg) 4 hours prior to ∼12.5% total body surface area sham or burn injury and were sacrificed one day after injury. Splenic T cells were harvested and cultured with anti-CD3 (2 µg/ml) in the presence or absence of rIL-12 (10 ng/ml) or PMA (10 ng/ml) plus ionomycin (50 ng/ml) for 48 hours. We observed a significant decrease in miRNA155, NFAT, Tbx21, Jun and Fos expression as well as IFN-γ release in T cells cultured with anti-CD3 following ethanol and burn injury compared with shams. The co-treatment of T cells with rIL-12 prevented the decrease in IFN-γ and NFAT, Tbx21, Jun and Fos, but not miRNA155. In contrast, the co-treatment with PMA plus ionomycin normalized the expression of NFAT. It did not prevent the decrease in IFN-γ, Tbx21, Jun, Fos and miRNA155. Finally, results obtained in miRNA155-/- mice did not show any change in T cell release of IFN-γ or expression of nuclear factors compared to wildtype mice. Together, these findings suggest that while ethanol and burn injury decreases the expression of miRNA155, it may not be involved in decreased IFN-γ under those conditions.
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Affiliation(s)
- Xiaoling Li
- Alcohol Research Program, Loyola University Chicago Health Sciences Division, Maywood, Illinois, United States of America
- Burn & Shock Trauma Research Institute, Loyola University Chicago Health Sciences Division, Maywood, Illinois, United States of America
- Department of Surgery, Loyola University Chicago Health Sciences Division, Maywood, Illinois, United States of America
| | - Juan L. Rendon
- Alcohol Research Program, Loyola University Chicago Health Sciences Division, Maywood, Illinois, United States of America
- Burn & Shock Trauma Research Institute, Loyola University Chicago Health Sciences Division, Maywood, Illinois, United States of America
| | - Mashkoor A. Choudhry
- Alcohol Research Program, Loyola University Chicago Health Sciences Division, Maywood, Illinois, United States of America
- Burn & Shock Trauma Research Institute, Loyola University Chicago Health Sciences Division, Maywood, Illinois, United States of America
- Department of Surgery, Loyola University Chicago Health Sciences Division, Maywood, Illinois, United States of America
- Deparmtent of Microbiology and Immunology, Loyola University Chicago Health Sciences Division, Maywood, Illinois, United States of America
- * E-mail:
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32
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Abstract
The activation of T cells is a tightly regulated process that has evolved to maximize protective immune responses to pathogens while minimizing damage to self-tissues. A delicate balance of cell-intrinsic, costimulatory, and transcriptional pathways as well as micro-environmental cues such as local cytokines controls the magnitude and nature of T-cell responses in vivo. The discovery of functional small noncoding RNAs called micro-RNAs (miRNAs) has introduced new mechanisms that contribute to the regulation of protein translation and cellular responses to stimuli. miRNAs are short (approximately 22 bp) RNA species, which bind to mRNAs and suppress translation. Due to their short length and imperfect base pairing requirements, each miRNA has the potential to regulate various pathways through the translational inhibition of multiple mRNAs. The human and mouse genomes each encode hundreds of miRNAs, and studying the function of miRNAs has led to the realization that they play important roles in diverse biological processes from development and cancer to immunity. This review focuses on the function of mir-155 in T cells and the impact of this miRNA on autoimmunity, tumor immunity, and pathogen-induced immunity.
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33
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Maxwell MJ, Srivastava N, Park MY, Tsantikos E, Engelman RW, Kerr WG, Hibbs ML. SHIP-1 deficiency in the myeloid compartment is insufficient to induce myeloid expansion or chronic inflammation. Genes Immun 2014; 15:233-40. [PMID: 24598798 DOI: 10.1038/gene.2014.9] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2013] [Revised: 12/17/2013] [Accepted: 01/13/2014] [Indexed: 01/17/2023]
Abstract
SHIP-1 has an important role in controlling immune cell function through its ability to downmodulate PI3K signaling pathways that regulate cell survival and responses to stimulation. Mice deficient in SHIP-1 display several chronic inflammatory phenotypes including antibody-mediated autoimmune disease, Crohn's disease-like ileitis and a lung disease reminiscent of chronic obstructive pulmonary disease. The ileum and lungs of SHIP-1-deficient mice are infiltrated at an early age with abundant myeloid cells and the mice have a limited lifespan primarily thought to be due to the consolidation of lungs with spontaneously activated macrophages. To determine whether the myeloid compartment is the key initiator of inflammatory disease in SHIP-1-deficient mice, we examined two independent strains of mice harboring myeloid-restricted deletion of SHIP-1. Contrary to expectations, conditional deletion of SHIP-1 in myeloid cells did not result in consolidating pneumonia or segmental ileitis typical of germline SHIP-1 deficiency. In addition, other myeloid cell abnormalities characteristic of germline loss of SHIP-1, including flagrant splenomegaly and enhanced myelopoiesis, were absent in mice lacking SHIP-1 in myeloid cells. This study indicates that the spontaneous inflammatory disease characteristic of germline SHIP-1 deficiency is not initiated solely by LysM-positive myeloid cells but requires the simultaneous loss of SHIP-1 in other hematolymphoid lineages.
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Affiliation(s)
- M J Maxwell
- Department of Immunology, Leukocyte Signalling Laboratory, Monash University, Alfred Medical Research and Education Precinct, Melbourne, Victoria, Australia
| | - N Srivastava
- Department of Microbiology and Immunology, SUNY Upstate Medical University, Syracuse, NY, USA
| | - M-Y Park
- Department of Microbiology and Immunology, SUNY Upstate Medical University, Syracuse, NY, USA
| | - E Tsantikos
- Department of Immunology, Leukocyte Signalling Laboratory, Monash University, Alfred Medical Research and Education Precinct, Melbourne, Victoria, Australia
| | - R W Engelman
- Departments of Pathology and Cell Biology and Pediatrics, H. Lee Moffitt Comprehensive Cancer Center and Research Institute, University of South Florida, Tampa, FL, USA
| | - W G Kerr
- 1] Department of Microbiology and Immunology, SUNY Upstate Medical University, Syracuse, NY, USA [2] Department of Pediatrics, SUNY Upstate Medical University, Syracuse, NY, USA [3] Department of Chemistry, Syracuse University, Syracuse, NY, USA
| | - M L Hibbs
- Department of Immunology, Leukocyte Signalling Laboratory, Monash University, Alfred Medical Research and Education Precinct, Melbourne, Victoria, Australia
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34
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Tu WJ, Liu XY, Dong H, Yu Y, Wang Y, Chen H. Phosphatidylinositol-3,4,5-Trisphosphate 5-Phosphatase 1: A Meaningful and Independent Marker to Predict Stroke in the Chinese Population. J Mol Neurosci 2013; 52:507-14. [PMID: 24352714 DOI: 10.1007/s12031-013-0206-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2013] [Accepted: 12/05/2013] [Indexed: 02/07/2023]
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35
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Le Floc'h A, Tanaka Y, Bantilan NS, Voisinne G, Altan-Bonnet G, Fukui Y, Huse M. Annular PIP3 accumulation controls actin architecture and modulates cytotoxicity at the immunological synapse. ACTA ACUST UNITED AC 2013; 210:2721-37. [PMID: 24190432 PMCID: PMC3832928 DOI: 10.1084/jem.20131324] [Citation(s) in RCA: 99] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Abstract
In T cells, PI3K activation in the periphery of the immune synapse leads to PIP3 accumulation that promotes actin polymerization in a pathway important for cytotoxic function. The immunological synapse formed by a T lymphocyte on the surface of a target cell contains a peripheral ring of filamentous actin (F-actin) that promotes adhesion and facilitates the directional secretion of cytokines and cytolytic factors. We show that growth and maintenance of this F-actin ring is dictated by the annular accumulation of phosphatidylinositol trisphosphate (PIP3) in the synaptic membrane. PIP3 functions in this context by recruiting the exchange factor Dock2 to the periphery of the synapse, where it drives actin polymerization through the Rho-family GTPase Rac. We also show that synaptic PIP3 is generated by class IA phosphoinositide 3-kinases that associate with T cell receptor microclusters and are activated by the GTPase Ras. Perturbations that inhibit or promote PIP3-dependent F-actin remodeling dramatically affect T cell cytotoxicity, demonstrating the functional importance of this pathway. These results reveal how T cells use lipid-based signaling to control synaptic architecture and modulate effector responses.
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Affiliation(s)
- Audrey Le Floc'h
- Immunology Program, 2 Computational Biology Program, Memorial Sloan-Kettering Cancer Center, New York, NY 10065
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36
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Srivastava N, Sudan R, Kerr WG. Role of inositol poly-phosphatases and their targets in T cell biology. Front Immunol 2013; 4:288. [PMID: 24069021 PMCID: PMC3779868 DOI: 10.3389/fimmu.2013.00288] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2013] [Accepted: 09/03/2013] [Indexed: 11/13/2022] Open
Abstract
T lymphocytes play a critical role in host defense in all anatomical sites including mucosal surfaces. This not only includes the effector arm of the immune system, but also regulation of immune responses in order to prevent autoimmunity. Genetic targeting of PI3K isoforms suggests that generation of PI(3,4,5)P3 by PI3K plays a critical role in promoting effector T cell responses. Consequently, the 5'- and 3'-inositol poly-phosphatases SHIP1, SHIP2, and phosphatase and tensin homolog capable of targeting PI(3,4,5)P3 are potential genetic determinants of T cell effector functions in vivo. In addition, the 5'-inositol poly-phosphatases SHIP1 and 2 can shunt PI(3,4,5)P3 to the rare but potent signaling phosphoinositide species PI(3,4)P2 and thus these SHIP1/2, and the INPP4A/B enzymes that deplete PI(3,4)P2 may have precise roles in T cell biology to amplify or inhibit effectors of PI3K signaling that are selectively recruited to and activated by PI(3,4)P2. Here we summarize recent genetic and chemical evidence that indicates the inositol poly-phosphatases have important roles in both the effector and regulatory functions of the T cell compartment. In addition, we will discuss future genetic studies that might be undertaken to further elaborate the role of these enzymes in T cell biology as well as potential pharmaceutical manipulation of these enzymes for therapeutic purposes in disease settings where T cell function is a key in vivo target.
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Affiliation(s)
- Neetu Srivastava
- Department of Microbiology and Immunology, SUNY Upstate Medical University , Syracuse, NY , USA
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37
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Azzi J, Skartsis N, Mounayar M, Magee CN, Batal I, Ting C, Moore R, Riella LV, Ohori S, Abdoli R, Smith B, Fiorina P, Heathcote D, Bakhos T, Ashton-Rickardt PG, Abdi R. Serine protease inhibitor 6 plays a critical role in protecting murine granzyme B-producing regulatory T cells. THE JOURNAL OF IMMUNOLOGY 2013; 191:2319-27. [PMID: 23913965 DOI: 10.4049/jimmunol.1300851] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Regulatory T cells (Tregs) play a pivotal role in the maintenance of immune tolerance and hold great promise as cell therapy for a variety of immune-mediated diseases. However, the cellular mechanisms that regulate Treg maintenance and homeostasis have yet to be fully explored. Although Tregs express granzyme-B (GrB) to suppress effector T cells via direct killing, the mechanisms by which they protect themselves from GrB-mediated self-inflicted damage are unknown. To our knowledge, we show for the first time that both induced Tregs and natural Tregs (nTregs) increase their intracellular expression of GrB and its endogenous inhibitor, serine protease inhibitor 6 (Spi6) upon activation. Subcellular fractionation and measurement of GrB activity in the cytoplasm of Tregs show that activated Spi6(-/-) Tregs had significantly higher cytoplasmic GrB activity. We observed an increase in GrB-mediated apoptosis in Spi6(-/-) nTregs and impaired suppression of alloreactive T cells in vitro. Spi6(-/-) Tregs were rescued from apoptosis by the addition of a GrB inhibitor (Z-AAD-CMK) in vitro. Furthermore, adoptive transfer experiments showed that Spi6(-/-) nTregs were less effective than wild type nTregs in suppressing graft-versus-host disease because of their impaired survival, as shown in our in vivo bioluminescence imaging. Finally, Spi6-deficient recipients rejected MHC class II-mismatch heart allografts at a much faster rate and showed a higher rate of apoptosis among Tregs, as compared with wild type recipients. To our knowledge, our data demonstrate, for the first time, a novel role for Spi6 in Treg homeostasis by protecting activated Tregs from GrB-mediated injury. These data could have significant clinical implications for Treg-based therapy in immune-mediated diseases.
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Affiliation(s)
- Jamil Azzi
- Transplantation Research Center, Renal Division, Brigham and Women's Hospital and Children's Hospital, Harvard Medical School, Boston, MA 02115, USA
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38
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Wu R, Li Y, Guo Z, Gong J, Zhu W, Li N, Li J. Triptolide ameliorates ileocolonic anastomosis inflammation in IL-10 deficient mice by mechanism involving suppression of miR-155/SHIP-1 signaling pathway. Mol Immunol 2013; 56:340-6. [PMID: 23911388 DOI: 10.1016/j.molimm.2013.05.006] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2013] [Revised: 05/13/2013] [Accepted: 05/14/2013] [Indexed: 02/08/2023]
Abstract
The model of ileocaecal resection (ICR) in IL-10(-/-) mice provides us a new way to investigate the postsurgical inflammation of intestinal anastomosis. As an extracts isolated from Tripterygium wilfordii Hook F (TWHF), triptolide has been used to treat Crohn's disease for years. Several mechanisms have been interpreted in previous studies. MiR-155, which can be inhibited by triptolide, has a powerful ability in regulating immune cells. As a target of miR-155, SHIP-1 is a potent inhibitor of many inflammatory pathways. MiR-155/SHIP-1 pathway plays an important role in the inflammatory conditions. We hypothesized that triptolide would ameliorate the postsurgical intestine inflammation especially the anastomosis inflammation by inhibition of miR-155/SHIP-1 pathway. Histological examination, as well as examination of calprotectin and MPO, demonstrated triptolide significantly reduced the severity of postsurgical intestine inflammation. Our data also suggested triptolide could suppress miR-155/SHIP-1 signaling pathway and attenuated expression of inflammatory cytokines in IL-10(-/-) mice performed ICR.
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Affiliation(s)
- Rong Wu
- Department of General Surgery, Jinling Hospital, Medical School of Nanjing University, Nanjing, PR China
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39
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Bounab Y, Getahun A, Cambier JC, Daëron M. Phosphatase regulation of immunoreceptor signaling in T cells, B cells and mast cells. Curr Opin Immunol 2013; 25:313-20. [PMID: 23684445 DOI: 10.1016/j.coi.2013.04.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2013] [Revised: 04/12/2013] [Accepted: 04/15/2013] [Indexed: 12/30/2022]
Abstract
Recent progress has begun to reveal the often complex and changing roles of phosphotyrosine and phosphoinositide phosphatases in regulation of immunoreceptor signaling. The resultant confusion has been further increased by discoveries of new players. Here we provide a review of recent progress in defining the roles of these enzymes in immunoreceptor-dependent mast cell, T cell and B cell activation.
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Affiliation(s)
- Yacine Bounab
- Institut Pasteur, Département d'Immunologie, Centre d'Immunologie Humaine, Paris, France
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40
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Abstract
Phosphoinositide signalling molecules interact with a plethora of effector proteins to regulate cell proliferation and survival, vesicular trafficking, metabolism, actin dynamics and many other cellular functions. The generation of specific phosphoinositide species is achieved by the activity of phosphoinositide kinases and phosphatases, which phosphorylate and dephosphorylate, respectively, the inositol headgroup of phosphoinositide molecules. The phosphoinositide phosphatases can be classified as 3-, 4- and 5-phosphatases based on their specificity for dephosphorylating phosphates from specific positions on the inositol head group. The SAC phosphatases show less specificity for the position of the phosphate on the inositol ring. The phosphoinositide phosphatases regulate PI3K/Akt signalling, insulin signalling, endocytosis, vesicle trafficking, cell migration, proliferation and apoptosis. Mouse knockout models of several of the phosphoinositide phosphatases have revealed significant physiological roles for these enzymes, including the regulation of embryonic development, fertility, neurological function, the immune system and insulin sensitivity. Importantly, several phosphoinositide phosphatases have been directly associated with a range of human diseases. Genetic mutations in the 5-phosphatase INPP5E are causative of the ciliopathy syndromes Joubert and MORM, and mutations in the 5-phosphatase OCRL result in Lowe's syndrome and Dent 2 disease. Additionally, polymorphisms in the 5-phosphatase SHIP2 confer diabetes susceptibility in specific populations, whereas reduced protein expression of SHIP1 is reported in several human leukaemias. The 4-phosphatase, INPP4B, has recently been identified as a tumour suppressor in human breast and prostate cancer. Mutations in one SAC phosphatase, SAC3/FIG4, results in the degenerative neuropathy, Charcot-Marie-Tooth disease. Indeed, an understanding of the precise functions of phosphoinositide phosphatases is not only important in the context of normal human physiology, but to reveal the mechanisms by which these enzyme families are implicated in an increasing repertoire of human diseases.
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41
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Foster JG, Blunt MD, Carter E, Ward SG. Inhibition of PI3K signaling spurs new therapeutic opportunities in inflammatory/autoimmune diseases and hematological malignancies. Pharmacol Rev 2013; 64:1027-54. [PMID: 23023033 DOI: 10.1124/pr.110.004051] [Citation(s) in RCA: 88] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
The phosphoinositide 3-kinase/mammalian target of rapamycin/protein kinase B (PI3K/mTOR/Akt) signaling pathway is central to a plethora of cellular mechanisms in a wide variety of cells including leukocytes. Perturbation of this signaling cascade is implicated in inflammatory and autoimmune disorders as well as hematological malignancies. Proteins within the PI3K/mTOR/Akt pathway therefore represent attractive targets for therapeutic intervention. There has been a remarkable evolution of PI3K inhibitors in the past 20 years from the early chemical tool compounds to drugs that are showing promise as anticancer agents in clinical trials. The use of animal models and pharmacological tools has expanded our knowledge about the contribution of individual class I PI3K isoforms to immune cell function. In addition, class II and III PI3K isoforms are emerging as nonredundant regulators of immune cell signaling revealing potentially novel targets for disease treatment. Further complexity is added to the PI3K/mTOR/Akt pathway by a number of novel signaling inputs and feedback mechanisms. These can present either caveats or opportunities for novel drug targets. Here, we consider recent advances in 1) our understanding of the contribution of individual PI3K isoforms to immune cell function and their relevance to inflammatory/autoimmune diseases as well as lymphoma and 2) development of small molecules with which to inhibit the PI3K pathway. We also consider whether manipulating other proximal elements of the PI3K signaling cascade (such as class II and III PI3Ks or lipid phosphatases) are likely to be successful in fighting off different immune diseases.
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Affiliation(s)
- John G Foster
- Inflammatory Cell Biology Laboratory, Department of Pharmacy and Pharmacology, University of Bath, Claverton Down, Bath, UK.
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42
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Kar SP, Seldin MF, Chen W, Lu E, Hirschfield GM, Invernizzi P, Heathcote J, Cusi D, Gershwin ME, Siminovitch KA, Amos CI. Pathway-based analysis of primary biliary cirrhosis genome-wide association studies. Genes Immun 2013; 14:179-86. [PMID: 23392275 DOI: 10.1038/gene.2013.1] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Genome-wide association studies (GWAS) have successfully identified several loci associated with primary biliary cirrhosis (PBC) risk. Pathway analysis complements conventional GWAS analysis. We applied the recently developed linear combination test for pathways to datasets drawn from independent PBC GWAS in Italian and Canadian subjects. Of the Kyoto Encyclopedia of Genes and Genomes and BioCarta pathways tested, 25 pathways in the Italian dataset (449 cases, 940 controls) and 26 pathways in the Canadian dataset (530 cases, 398 controls) were associated with PBC susceptibility (P<0.05). After correcting for multiple comparisons, only the eight most significant pathways in the Italian dataset had FDR <0.25 with tumor necrosis factor/stress-related signaling emerging as the top pathway (P=7.38 × 10⁻⁴, FDR=0.18). Two pathways, phosphatidylinositol signaling and hedgehog signaling, were replicated in both datasets (P<0.05), and subjected to two additional complementary pathway tests. Both pathway signals remained significant in the Italian dataset on modified gene set enrichment analysis (P<0.05). In both GWAS, variants nominally associated with PBC were significantly overrepresented in the phosphatidylinositol pathway (Fisher exact P<0.05). These results point to established and novel pathway-level associations with inherited predisposition to PBC that, on further independent replication and functional validation, may provide fresh insights into PBC etiology.
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Affiliation(s)
- S P Kar
- Department of Genetics, University of Texas MD Anderson Cancer Center, Houston, TX, USA
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43
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Huffaker TB, Hu R, Runtsch MC, Bake E, Chen X, Zhao J, Round JL, Baltimore D, O'Connell RM. Epistasis between microRNAs 155 and 146a during T cell-mediated antitumor immunity. Cell Rep 2012. [PMID: 23200854 DOI: 10.1016/j.celrep.2012.10.025] [Citation(s) in RCA: 124] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
Abstract
An increased understanding of antitumor immunity is necessary for improving cell-based immunotherapies against human cancers. Here, we investigated the roles of two immune system-expressed microRNAs (miRNAs), miR-155 and miR-146a, in the regulation of antitumor immune responses. Our results indicate that miR-155 promotes and miR-146a inhibits interferon γ (IFNγ) responses by T cells and reduces solid tumor growth in vivo. Using a double-knockout (DKO) mouse strain deficient in both miR-155 and miR-146a, we have also identified an epistatic relationship between these two miRNAs. DKO mice had defective T cell responses and tumor growth phenotypes similar to miR-155(-/-) mice. Further analysis of the T cell compartment revealed that miR-155 modulates IFNγ expression through a mechanism involving repression of Ship1. Our work reveals critical roles for miRNAs in the reciprocal regulation of CD4(+) and CD8(+) T cell-mediated antitumor immunity and demonstrates the dominant nature of miR-155 during its promotion of immune responses.
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Affiliation(s)
- Thomas B Huffaker
- Division of Microbiology and Immunology, Department of Pathology, University of Utah, Salt Lake City, UT 84112, USA
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Corey SJ, Mehta HM, Stein PL. Two SHIPs passing in the middle of the immune system. Eur J Immunol 2012; 42:1681-4. [PMID: 22696261 DOI: 10.1002/eji.201242706] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Immunity requires a complex, multiscale system of molecules, cells, and cytokines. In this issue of the European Journal of Immunology, Collazo et al. [Eur. J. Immunol. 2012. 42: 1785-1796] provide evidence that links the lipid phosphatase SHIP1 with the coordination of interactions between regulatory T (Treg) cells and myeloid-derived suppressor cells (MDSCs). Using conditional knockouts of SHIP1 in either the myeloid or T-cell-lineage of mice, the authors show that the regulated development of Treg cells is controlled directly by cell-intrinsic SHIP1, and indirectly by extrinsic SHIP1 control of an unknown myeloid cell. Regulation of MDSCs is also determined by SHIP1 in an extrinsic manner, again via an as-yet-unknown myeloid cell. Furthermore, this extrinsic control of Treg cells and MDSCs is mediated in part by increased production of G-CSF, a growth factor critical for the production of neutrophils, in SHIP1-deficient mice. Thus, a physiologically important implication of this report is the collaboration between the innate and adaptive immune systems in fine tuning of Treg cells as discussed in this commentary.
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Affiliation(s)
- Seth J Corey
- Department of Pediatrics and Cell & Molecular Biology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA.
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45
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Collazo MM, Paraiso KHT, Park MY, Hazen AL, Kerr WG. Lineage extrinsic and intrinsic control of immunoregulatory cell numbers by SHIP. Eur J Immunol 2012; 42:1785-95. [PMID: 22535653 DOI: 10.1002/eji.201142092] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
We previously showed that germline or induced SHIP deficiency expands immuno-regulatory cell numbers in T lymphoid and myeloid lineages. We postulated these increases could be interrelated. Here, we show that myeloid-specific ablation of SHIP leads to the expansion of both myeloid-derived suppressor cell (MDSC) and regulatory T (Treg) cell numbers, indicating SHIP-dependent control of Treg-cell numbers by a myeloid cell type. Conversely, T-lineage specific ablation of SHIP leads to expansion of Treg-cell numbers, but not expansion of the MDSC compartment, indicating SHIP also has a lineage intrinsic role in limiting Treg-cell numbers. However, the SHIP-deficient myeloid cell that promotes MDSC and Treg-cell expansion is not an MDSC as they lack SHIP protein expression. Thus, regulation of MDSC numbers in vivo must be controlled in a cell-extrinsic fashion by another myeloid cell type. We had previously shown that G-CSF levels are profoundly increased in SHIP(-/-) mice, suggesting this myelopoietic growth factor could promote MDSC expansion in a cell-extrinsic fashion. Consistent with this hypothesis, we find that G-CSF is required for expansion of the MDSC splenic compartment in mice rendered SHIP-deficient as adults. Thus, SHIP controls MDSC numbers, in part, by limiting production of the myelopoietic growth factor G-CSF.
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Affiliation(s)
- Michelle M Collazo
- Department of Cell Biology, Microbiology and Molecular Biology, University of South Florida, Tampa, FL, USA
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46
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Mouse natural killer cell development and maturation are differentially regulated by SHIP-1. Blood 2012; 120:4583-90. [PMID: 23034281 DOI: 10.1182/blood-2012-04-425009] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
The SH2-containing inositol phosphatase-1 (SHIP-1) is a 5' inositol phosphatase known to negatively regulate the product of phosphoinositide-3 kinase (PI3K), phosphatidylinositol-3.4,5-trisphosphate. SHIP-1 can be recruited to a large number of inhibitory receptors expressed on natural killer (NK) cells. However, its role in NK cell development, maturation, and functions is not well defined. In this study, we found that the absence of SHIP-1 results in a loss of peripheral NK cells. However, using chimeric mice we demonstrated that SHIP-1 expression is not required intrinsically for NK cell lineage development. In contrast, SHIP-1 is required cell autonomously for NK cell terminal differentiation. These findings reveal both a direct and indirect role for SHIP-1 at different NK cell development checkpoints. Notably, SHIP-1-deficient NK cells display an impaired ability to secrete IFN-γ during cytokine receptor-mediated responses, whereas immunoreceptor tyrosine-based activation motif containing receptor-mediated responses is not affected. Taken together, our results provide novel insights on how SHIP-1 participates in the development, maturation, and effector functions of NK cells.
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Han JM, Patterson SJ, Levings MK. The Role of the PI3K Signaling Pathway in CD4(+) T Cell Differentiation and Function. Front Immunol 2012; 3:245. [PMID: 22905034 PMCID: PMC3417165 DOI: 10.3389/fimmu.2012.00245] [Citation(s) in RCA: 83] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2012] [Accepted: 07/23/2012] [Indexed: 12/15/2022] Open
Abstract
The relative activity of regulatory versus conventional CD4(+) T cells ultimately maintains the delicate balance between immune tolerance and inflammation. At the molecular level, the activity of phosphatidylinositol 3-kinase (PI3K) and its downstream positive and negative regulators has a major role in controlling the balance between immune regulation and activation of different subsets of effector CD4(+) T cells. In contrast to effector T cells which require activation of the PI3K to differentiate and mediate their effector function, regulatory T cells rely on minimal activation of this pathway to develop and maintain their characteristic phenotype, function, and metabolic state. In this review, we discuss the role of the PI3K signaling pathway in CD4(+) T cell differentiation and function, and focus on how modulation of this pathway in T cells can alter the outcome of an immune response, ultimately tipping the balance between tolerance and inflammation.
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Affiliation(s)
- Jonathan M Han
- Department of Surgery, Child and Family Research Institute, The University of British Columbia Vancouver, BC, Canada
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48
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Blunt MD, Ward SG. Pharmacological targeting of phosphoinositide lipid kinases and phosphatases in the immune system: success, disappointment, and new opportunities. Front Immunol 2012; 3:226. [PMID: 22876243 PMCID: PMC3410520 DOI: 10.3389/fimmu.2012.00226] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2012] [Accepted: 07/12/2012] [Indexed: 12/24/2022] Open
Abstract
The predominant expression of the γ and δ isoforms of PI3K in cells of hematopoietic lineage prompted speculation that inhibitors of these isoforms could offer opportunities for selective targeting of PI3K in the immune system in a range of immune-related pathologies. While there has been some success in developing PI3Kδ inhibitors, progress in developing selective inhibitors of PI3Kγ has been rather disappointing. This has prompted the search for alternative targets with which to modulate PI3K signaling specifically in the immune system. One such target is the SH2 domain-containing inositol-5-phosphatase-1 (SHIP-1) which de-phosphorylates PI(3,4,5)P3 at the D5 position of the inositol ring to create PI(3,4)P2. In this article, we first describe the current state of PI3K isoform-selective inhibitor development. We then focus on the structure of SHIP-1 and its function in the immune system. Finally, we consider the current state of development of small molecule compounds that potently and selectively modulate SHIP activity and which offer novel opportunities to manipulate PI3K mediated signaling in the immune system.
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Affiliation(s)
- Matthew D Blunt
- Inflammatory Cell Biology Laboratory, Department of Pharmacy and Pharmacology, University of Bath Bath, UK
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Abstract
Activation of PI3K (phosphoinositide 3-kinase) is a shared response to engagement of diverse types of transmembrane receptors. Depending on the cell type and stimulus, PI3K activation can promote different fates including proliferation, survival, migration and differentiation. The diverse roles of PI3K signalling are well illustrated by studies of lymphocytes, the cells that mediate adaptive immunity. Genetic and pharmacological experiments have shown that PI3K activation regulates many steps in the development, activation and differentiation of both B- and T-cells. These findings have prompted the development of PI3K inhibitors for the treatment of autoimmunity and inflammatory diseases. PI3K activation, however, has both positive and negative roles in immune system activation. Consequently, although PI3K suppression can attenuate immune responses it can also enhance inflammation, disrupt peripheral tolerance and promote autoimmunity. An exciting discovery is that a selective inhibitor of the p110δ catalytic isoform of PI3K, CAL-101, achieves impressive clinical efficacy in certain B-cell malignancies. A model is emerging in which p110δ inhibition disrupts signals from the lymphoid microenvironment, leading to release of leukaemia and lymphoma cells from their protective niche. These encouraging findings have given further momentum to PI3K drug development efforts in both cancer and immune diseases.
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Loss-of-function of inositol polyphosphate-4-phosphatase reversibly increases the severity of allergic airway inflammation. Nat Commun 2012; 3:877. [PMID: 22673904 DOI: 10.1038/ncomms1880] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2011] [Accepted: 05/02/2012] [Indexed: 01/09/2023] Open
Abstract
Inositol polyphosphate phosphatases regulate the magnitude of phosphoinositide-3 kinase signalling output. Although inositol polyphosphate-4-phosphatase is known to regulate phosphoinositide-3 kinase signalling, little is known regarding its role in asthma pathogenesis. Here we show that modulation of inositol polyphosphate-4-phosphatase alters the severity of asthma. Allergic airway inflammation in mice led to calpain-mediated degradation of inositol polyphosphate-4-phosphatase. In allergic airway inflammation models, preventing inositol polyphosphate-4-phosphatase degradation by inhibiting calpain activity, or overexpression of inositol polyphosphate-4-phosphatase in mouse lungs, led to attenuation of the asthma phenotype. Conversely, knockdown of inositol polyphosphate-4-phosphatase severely aggravated the allergic airway inflammation and the asthma phenotype. Interestingly, inositol polyphosphate-4-phosphatase knockdown in lungs of naive mice led to spontaneous airway hyper-responsiveness, suggesting that inositol polyphosphate-4-phosphatase could be vital in maintaining the lung homeostasis. We suggest that inositol polyphosphate-4-phosphatase has an important role in modulating inflammatory response in asthma, and thus, uncover a new understanding of the complex interplay between inositol signalling and asthma, which could provide alternative strategies in asthma management.
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