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Rathnayake UM, Wada J, Wall VE, Jones J, Jenkins LM, Andreotti AH, Samelson LE. Purification and characterization of full-length monomeric TEC family kinase, ITK. Protein Expr Purif 2025; 229:106682. [PMID: 39894064 PMCID: PMC11875054 DOI: 10.1016/j.pep.2025.106682] [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: 12/16/2024] [Revised: 01/22/2025] [Accepted: 01/31/2025] [Indexed: 02/04/2025]
Abstract
An early step in the activation of T cells via the T cell antigen receptor is the phosphorylation and activation of phospholipase C-γ1 (PLC-γ1) by the TEC family tyrosine kinase, interleukin-2 (IL-2) inducible T cell kinase (ITK). PLC-γ1 activation occurs within a multi-protein complex comprised of the enzymes ITK, PLC-γ1, and VAV, and the adapter molecules, LAT, Gads, SLP-76, and NCK. Studies of ITK activation and the role of this heptameric complex in regulating ITK activation and function have not been possible due to the lack of success in the expression and purification of full-length, monomeric ITK protein. In this study, we have produced soluble full-length wild-type ITK protein by co-expressing an N-terminal solubility-tagged ITK construct with a kinase-specific co-chaperone CDC37 in an insect cell line. Although the majority of the purified ITK protein is oligomerized, there is a 13-fold increase in the yield of monomeric protein production compared to the last reported purification. Previous studies suggest that the ITK oligomerization is mediated by intermolecular interactions. We created several mutants to disrupt these self-associations. Expression of one of these, the C96E/T110I mutant, produced 20 times more monomer than the wild-type construct. The in vitro characterization of these protein constructs showed that the purified protein is stable and functional. This successful purification and in vitro characterization of full-length monomeric ITK protein will aid in understanding the mechanism by which ITK is recruited into the heptameric complex and is enabled to phosphorylate and activate PLC-γ1.
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Affiliation(s)
- Udumbara M Rathnayake
- Laboratory of Cellular and Molecular Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Junya Wada
- Laboratory of Cellular and Molecular Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Vanessa E Wall
- Protein Expression Laboratory and RAS Reagents Core, Frederick National Laboratory for Cancer Research, Frederick, MD, 21702, USA
| | - Jane Jones
- Protein Expression Laboratory and RAS Reagents Core, Frederick National Laboratory for Cancer Research, Frederick, MD, 21702, USA
| | - Lisa M Jenkins
- Laboratory of Cell Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Amy H Andreotti
- Roy J. Carver Department of Biochemistry, Biophysics and Molecular Biology, Iowa State University, Ames, IA, 50014, USA
| | - Lawrence E Samelson
- Laboratory of Cellular and Molecular Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, 20892, USA.
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Kashani B, Zandi Z, Pourbagheri-Sigaroodi A, Yousefi AM, Ghaffari SH, Bashash D. The PI3K signaling pathway; from normal lymphopoiesis to lymphoid malignancies. Expert Rev Anticancer Ther 2024; 24:493-512. [PMID: 38690706 DOI: 10.1080/14737140.2024.2350629] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2023] [Accepted: 04/29/2024] [Indexed: 05/02/2024]
Abstract
INTRODUCTION As a vital mechanism of survival, lymphopoiesis requires the collaboration of different signaling molecules to orchestrate each step of cell development and maturation. The PI3K pathway is considerably involved in the maturation of lymphatic cells and therefore, its dysregulation can immensely affect human well-being and cause some of the most prevalent malignancies. As a result, studies that investigate this pathway could pave the way for a better understanding of the lymphopoiesis mechanisms, the undesired changes that lead to cancer progression, and how to design drugs to solve this issue. AREAS COVERED The present review addresses the aforementioned aspects of the PI3K pathway and helps pave the way for future therapeutic approaches. In order to access the articles, databases such as Medicine Medline/PubMed, Scopus, Google Scholar, and Science Direct were utilized. The search formula was established by identifying main keywords including PI3K/Akt/mTOR pathway, Lymphopoiesis, Lymphoid malignancies, and inhibitors. EXPERT OPINION The PI3K pathway is crucial for lymphocyte development and differentiation, making it a potential target for therapeutic intervention in lymphoid cancers. Studies are focused on developing PI3K inhibitors to impede the progression of hematologic malignancies, highlighting the pathway's significance in lymphoma and lymphoid leukemia.
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Affiliation(s)
- Bahareh Kashani
- Hematology, Oncology and Stem Cell Transplantation Research Center, School of Medicine, Shariati Hospital, Tehran University of Medical Sciences, Tehran, Iran
- Department of Medical Genetics, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Zahra Zandi
- Hematology, Oncology and Stem Cell Transplantation Research Center, School of Medicine, Shariati Hospital, Tehran University of Medical Sciences, Tehran, Iran
- Department of Medical Genetics, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Atieh Pourbagheri-Sigaroodi
- Department of Hematology and Blood Banking, School of Allied Medical Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Amir-Mohammad Yousefi
- Department of Hematology and Blood Banking, School of Allied Medical Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Seyed H Ghaffari
- Hematology, Oncology and Stem Cell Transplantation Research Center, School of Medicine, Shariati Hospital, Tehran University of Medical Sciences, Tehran, Iran
| | - Davood Bashash
- Department of Hematology and Blood Banking, School of Allied Medical Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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Karageorgos S, Platt AS, Bassiri H. Genetics of Primary Hemophagocytic Lymphohistiocytosis. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2024; 1448:75-101. [PMID: 39117809 DOI: 10.1007/978-3-031-59815-9_7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/10/2024]
Abstract
Hemophagocytic lymphohistiocytosis (HLH) constitutes a rare, potentially life-threatening hyperinflammatory immune dysregulation syndrome that can present with a variety of clinical signs and symptoms, including fever, hepatosplenomegaly, and abnormal laboratory and immunological findings such as cytopenias, hyperferritinemia, hypofibrinogenemia, hypertriglyceridemia, elevated blood levels of soluble CD25 (interleukin (IL)-2 receptor α-chain), or diminished natural killer (NK)-cell cytotoxicity (reviewed in detail in Chapter 11 of this book). While HLH can be triggered by an inciting event (e.g., infections), certain monogenic causes have been associated with a significantly elevated risk of development of HLH, or recurrence of HLH in patients who have recovered from their disease episode. These monogenic predisposition syndromes are variably referred to as "familial" (FHL) or "primary" HLH (henceforth referred to as "pHLH") and are the focus of this chapter. Conversely, secondary HLH (sHLH) often occurs in the absence of monogenic etiologies that are commonly associated with pHLH and can be triggered by infections, malignancies, or rheumatological diseases; these triggers and the genetics associated with sHLH are discussed in more detail in other chapters in this book.
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Affiliation(s)
- Spyridon Karageorgos
- First Department of Pediatrics, "Aghia Sophia" Children's Hospital, National and Kapodistrian University of Athens, Athens, Greece
| | - Anna S Platt
- Roberts Individualized Medical Genetics Center and Immune Dysregulation Program, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Hamid Bassiri
- Immune Dysregulation Program and Division of Infectious Diseases, Children's Hospital of Philadelphia, Philadelphia, PA, USA.
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Sacco KA, Notarangelo LD, Delmonte OM. When to suspect inborn errors of immunity in Epstein-Barr virus-related lymphoproliferative disorders. Clin Microbiol Infect 2023; 29:457-462. [PMID: 36209991 PMCID: PMC10066820 DOI: 10.1016/j.cmi.2022.10.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Revised: 09/20/2022] [Accepted: 10/01/2022] [Indexed: 11/03/2022]
Abstract
BACKGROUND More than 95% of humans have been infected with Epstein-Barr virus (EBV) and develop anti-EBV IgG antibodies, conferring immunity. However, among specific populations, EBV may induce a range of B-cell lymphoproliferative disorders (LPDs). EBV may also contribute to T-cell and natural killer (NK)-cell lymphoproliferation. The immune system is essential to prevent infection and development of cancer. Inborn errors of immunity (IEIs) are a heterogenous group of more than 450 genetic disorders predisposing to severe and/or recurrent infection, autoimmunity, autoinflammation, or early-onset/severe neoplasia or lymphoproliferation. Monogenic disorders of T-cell and B-cell signalling are classic IEIs that predispose to EBV-associated LPDs. OBJECTIVES We aimed to outline the various clinical manifestations of EBV-associated LPDs and the underlying IEIs associated with such presentations and discuss the recommended management and therapeutic options pertaining to these disorders. SOURCES We searched PubMed, Embase, and Web of Science Core Collection on 30 September 2021. Clinical studies, systematic reviews, narrative reviews, and case reports were identified through search strategy and cross reference from primary literature. CONTENT Effective T-cell and NK-cell cytotoxicity towards EBV-infected B cells relies on intact MAGT1-dependent NKG2D pathways and signalling lymphocyte activation molecular-associated protein-dependent signalling lymphocyte activation molecular receptors. The interaction between CD27 and CD70 is also critical to drive the expansion of EBV-specific T cells. IEIs due to T-cell and B-cell signalling defects and/or impaired T-cell and NK-cell cytotoxicity predispose to EBV-related lymphoproliferation. This includes classic disorders such as X-linked lymphoproliferative disease 1 (due to SH2D1A mutations), X-linked lymphoproliferative disease 2 (XIAP), and other genetic diseases, such as ITK, MAGT1, CD27, CD70, CTPS1, RASGRP1, and CORO1A deficiencies. EBV-driven lymphoproliferation may manifest to a lesser degree in MST1/STK4, DOCK8, STIM1, CORO1A, IL21R, PIK3CD gain-of-function, and PI3KR1 deficiencies. IMPLICATIONS Early screening for IEIs is indicated in cases of EBV-related lymphoproliferation because different forms of IEIs have specific prognostic and therapeutic implications.
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Affiliation(s)
- Keith A Sacco
- Laboratory of Clinical Immunology and Microbiology, Immune Deficiency Genetics Section, National Institutes of Health, Bethesda, MD, USA
| | - Luigi D Notarangelo
- Laboratory of Clinical Immunology and Microbiology, Immune Deficiency Genetics Section, National Institutes of Health, Bethesda, MD, USA
| | - Ottavia M Delmonte
- Laboratory of Clinical Immunology and Microbiology, Immune Deficiency Genetics Section, National Institutes of Health, Bethesda, MD, USA.
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Liang W, Li K, Zhang Q, Li K, Ai K, Zhang J, Jiao X, Li J, Wei X, Yang J. Interleukin-2 inducible T cell kinase (ITK) may participate in the anti-bacterial immune response of Nile tilapia via regulating T-cell activation. FISH & SHELLFISH IMMUNOLOGY 2022; 127:419-426. [PMID: 35779809 DOI: 10.1016/j.fsi.2022.06.044] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Revised: 05/28/2022] [Accepted: 06/24/2022] [Indexed: 06/15/2023]
Abstract
Interleukin-2 inducible T cell kinase (ITK) plays a predominant role in the T-cell receptor (TCR) signaling cascade to ensure valid T-cell activation and function. Nevertheless, whether it regulates T-cell response of early vertebrates remains unknown. Herein, we investigated the involvement of ITK in the lymphocyte-mediated adaptive immune response, and its regulation to T-cell activation in the Nile tilapia Oreochromis niloticus. Both sequence and structure of O. niloticus ITK (OnITK) were remarkably conserved with its homologues from other vertebrates, implying its potential conserved function. OnITK mRNA was extensively expressed in lymphoid-related tissues, and with the relative highest level in peripheral blood. Once Nile tilapia was infected by Edwardsiella piscicida, OnITK in splenic lymphocytes was significantly up-regulated on 7-day post infection at both transcription and translation levels, suggesting that OnITK might involve in the primary adaptive immune response of teleost. Furthermore, upon splenic lymphocytes were stimulated by T-cell specific mitogen PHA, OnITK mRNA and protein levels were dramatically elevated. More importantly, treatment of splenic lymphocytes with specific inhibitor significantly crippled OnITK expression, which in turn impaired the inducible expression of T-cell activation markers IFN-γ, IL-2 and CD122, indicating the critical roles of ITK in regulating T-cell activation of Nile tilapia. Taken together, our results suggest that ITK takes part in the lymphocyte-mediated adaptive immunity of tilapia, and is indispensable for T-cell activation of teleost. Our findings thus provide novel evidences for understanding the mechanism regulating T-cell immunity of early vertebrates, as well as the evolution of adaptive immune system.
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Affiliation(s)
- Wei Liang
- State Key Laboratory of Estuarine and Coastal Research, School of Life Sciences, East China Normal University, Shanghai, 200241, China
| | - Kunming Li
- State Key Laboratory of Estuarine and Coastal Research, School of Life Sciences, East China Normal University, Shanghai, 200241, China
| | - Qian Zhang
- State Key Laboratory of Estuarine and Coastal Research, School of Life Sciences, East China Normal University, Shanghai, 200241, China
| | - Kang Li
- State Key Laboratory of Estuarine and Coastal Research, School of Life Sciences, East China Normal University, Shanghai, 200241, China
| | - Kete Ai
- State Key Laboratory of Estuarine and Coastal Research, School of Life Sciences, East China Normal University, Shanghai, 200241, China
| | - Jiansong Zhang
- State Key Laboratory of Estuarine and Coastal Research, School of Life Sciences, East China Normal University, Shanghai, 200241, China
| | - Xinying Jiao
- State Key Laboratory of Estuarine and Coastal Research, School of Life Sciences, East China Normal University, Shanghai, 200241, China
| | - Jiaqi Li
- State Key Laboratory of Estuarine and Coastal Research, School of Life Sciences, East China Normal University, Shanghai, 200241, China
| | - Xiumei Wei
- State Key Laboratory of Estuarine and Coastal Research, School of Life Sciences, East China Normal University, Shanghai, 200241, China.
| | - Jialong Yang
- State Key Laboratory of Estuarine and Coastal Research, School of Life Sciences, East China Normal University, Shanghai, 200241, China; Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266237, China
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Chen L, Mei Z, Guo W, Ding S, Huang T, Cai YD. Recognition of Immune Cell Markers of COVID-19 Severity with Machine Learning Methods. BIOMED RESEARCH INTERNATIONAL 2022; 2022:6089242. [PMID: 35528178 PMCID: PMC9073549 DOI: 10.1155/2022/6089242] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/06/2022] [Accepted: 04/11/2022] [Indexed: 01/08/2023]
Abstract
COVID-19 is hypothesized to be linked to the host's excessive inflammatory immunological response to SARS-CoV-2 infection, which is regarded to be a major factor in disease severity and mortality. Numerous immune cells play a key role in immune response regulation, and gene expression analysis in these cells could be a useful method for studying disease states, assessing immunological responses, and detecting biomarkers. Here, we developed a machine learning procedure to find biomarkers that discriminate disease severity in individual immune cells (B cell, CD4+ cell, CD8+ cell, monocyte, and NK cell) using single-cell gene expression profiles of COVID-19. The gene features of each profile were first filtered and ranked using the Boruta feature selection method and mRMR, and the resulting ranked feature lists were then fed into the incremental feature selection method to determine the optimal number of features with decision tree and random forest algorithms. Meanwhile, we extracted the classification rules in each cell type from the optimal decision tree classifiers. The best gene sets discovered in this study were analyzed by GO and KEGG pathway enrichment, and some important biomarkers like TLR2, ITK, CX3CR1, IL1B, and PRDM1 were validated by recent literature. The findings reveal that the optimal gene sets for each cell type can accurately classify COVID-19 disease severity and provide insight into the molecular mechanisms involved in disease progression.
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Affiliation(s)
- Lei Chen
- School of Life Sciences, Shanghai University, Shanghai 200444, China
- College of Information Engineering, Shanghai Maritime University, Shanghai 201306, China
| | - Zi Mei
- Shanghai Institute of Nutrition and Health, Chinese Academy of Sciences, Shanghai 200031, China
| | - Wei Guo
- Key Laboratory of Stem Cell Biology, Shanghai Jiao Tong University School of Medicine (SJTUSM) & Shanghai Institutes for Biological Sciences (SIBS), Chinese Academy of Sciences (CAS), Shanghai 200031, China
| | - ShiJian Ding
- School of Life Sciences, Shanghai University, Shanghai 200444, China
| | - Tao Huang
- Bio-Med Big Data Center, CAS Key Laboratory of Computational Biology, Shanghai Institute of Nutrition and Health, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai 200031, China
- CAS Key Laboratory of Tissue Microenvironment and Tumor, Shanghai Institute of Nutrition and Health, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Yu-Dong Cai
- School of Life Sciences, Shanghai University, Shanghai 200444, China
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Shah K, Al-Haidari A, Sun J, Kazi JU. T cell receptor (TCR) signaling in health and disease. Signal Transduct Target Ther 2021; 6:412. [PMID: 34897277 PMCID: PMC8666445 DOI: 10.1038/s41392-021-00823-w] [Citation(s) in RCA: 253] [Impact Index Per Article: 63.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2021] [Revised: 11/02/2021] [Accepted: 11/02/2021] [Indexed: 12/18/2022] Open
Abstract
Interaction of the T cell receptor (TCR) with an MHC-antigenic peptide complex results in changes at the molecular and cellular levels in T cells. The outside environmental cues are translated into various signal transduction pathways within the cell, which mediate the activation of various genes with the help of specific transcription factors. These signaling networks propagate with the help of various effector enzymes, such as kinases, phosphatases, and phospholipases. Integration of these disparate signal transduction pathways is done with the help of adaptor proteins that are non-enzymatic in function and that serve as a scaffold for various protein-protein interactions. This process aids in connecting the proximal to distal signaling pathways, thereby contributing to the full activation of T cells. This review provides a comprehensive snapshot of the various molecules involved in regulating T cell receptor signaling, covering both enzymes and adaptors, and will discuss their role in human disease.
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Affiliation(s)
- Kinjal Shah
- Division of Translational Cancer Research, Department of Laboratory Medicine, Lund University, Lund, Sweden
- Lund Stem Cell Center, Department of Laboratory Medicine, Lund University, Lund, Sweden
| | - Amr Al-Haidari
- Clinical Genetics and Pathology, Skåne University Hospital, Region Skåne, Lund, Sweden
- Clinical Sciences Department, Surgery Research Unit, Lund University, Malmö, Sweden
| | - Jianmin Sun
- Division of Translational Cancer Research, Department of Laboratory Medicine, Lund University, Lund, Sweden
- Lund Stem Cell Center, Department of Laboratory Medicine, Lund University, Lund, Sweden
- NHC Key Laboratory of Metabolic Cardiovascular Diseases Research, Science and Technology center, School of Basic Medical Sciences, Ningxia Medical University, Yinchuan, China
| | - Julhash U Kazi
- Division of Translational Cancer Research, Department of Laboratory Medicine, Lund University, Lund, Sweden.
- Lund Stem Cell Center, Department of Laboratory Medicine, Lund University, Lund, Sweden.
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8
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Hierarchy of signaling thresholds downstream of the T cell receptor and the Tec kinase ITK. Proc Natl Acad Sci U S A 2021; 118:2025825118. [PMID: 34452995 DOI: 10.1073/pnas.2025825118] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The strength of peptide:MHC interactions with the T cell receptor (TCR) is correlated with the time to first cell division, the relative scale of the effector cell response, and the graded expression of activation-associated proteins like IRF4. To regulate T cell activation programming, the TCR and the TCR proximal interleukin-2-inducible T cell kinase (ITK) simultaneously trigger many biochemically separate signaling cascades. T cells lacking ITK exhibit selective impairments in effector T cell responses after activation, but under the strongest signaling conditions, ITK activity is dispensable. To gain insight into whether TCR signal strength and ITK activity tune observed graded gene expression through the unequal activation of distinct signaling pathways, we examined Erk1/2 phosphorylation or nuclear factor of activated T cells (NFAT) and nuclear factor (NF)-κB translocation in naïve OT-I CD8+ cell nuclei. We observed the consistent digital activation of NFAT1 and Erk1/2, but NF-κB displayed dynamic, graded activation in response to variation in TCR signal strength, tunable by treatment with an ITK inhibitor. Inhibitor-treated cells showed the dampened induction of AP-1 factors Fos and Fosb, NF-κB response gene transcripts, and survival factor Il2 transcripts. ATAC sequencing analysis also revealed that genomic regions most sensitive to ITK inhibition were enriched for NF-κB and AP-1 motifs. Specific inhibition of NF-κB during peptide stimulation tuned the expression of early gene products like c-Fos. Together, these data indicate a key role for ITK in orchestrating the optimal activation of separate TCR downstream pathways, specifically aiding NF-κB activation. More broadly, we revealed a mechanism by which variations in TCR signal strength can produce patterns of graded gene expression in activated T cells.
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Abstract
The focus of this review is to examine the role of ITK signaling in multiple diseases and investigate the clinical potential of ITK inhibition. The diseases and potential interventions reviewed include T cell-derived malignancies as well as other neoplastic diseases, allergic diseases such as asthma and atopic dermatitis, certain infectious diseases, several autoimmune disorders such as rheumatoid arthritis and psoriasis, and finally the use of ITK inhibition in both solid organ and bone marrow transplantation recipients.
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Affiliation(s)
- Samuel Weeks
- Department of Microbiology and Immunology, SUNY Upstate Medical University, 766 Irving Avenue Weiskotten Hall Suite 2281, Syracuse, NY 13210, USA
| | - Rebecca Harris
- Department of Microbiology and Immunology, SUNY Upstate Medical University, 766 Irving Avenue Weiskotten Hall Suite 2281, Syracuse, NY 13210, USA
| | - Mobin Karimi
- Department of Microbiology and Immunology, SUNY Upstate Medical University, 766 Irving Avenue Weiskotten Hall Suite 2281, Syracuse, NY 13210, USA
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10
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Abstract
BACKGROUND Lupus B cells not only produce autoantibodies against nuclear antigens but also provide co-stimulation to T cells. However, there is still a lack of comprehensive understanding of the mechanism underlying lupus B cell hyperactivation. METHODS This study focuses on the detection of B cell activation status, analysis of early BCR signaling response, DNA sequencing, and quantity determination of BCR signaling regulators in murine lupus models. RESULTS Our result showed that there is a B cell hyperactivation with a significant elevation of B cell activation markers, and a BCR signaling hyperactivity with an abnormal increase of phosphorylated BCR signaling molecules and cytoplasmic calcium in the early response to BCR crosslinking in B6.Sle1/2/3 lupus mouse. Whole exome sequencing identified a multiple point mutation in the exon of many BCR signaling regulators in common murine lupus models, MRL/lpr, NZM2410, BXSB, NZB, and NZW strains. cNDA sequencing confirmed FcγR2b, Ly9, Pirb, Siglecg, and CD22 BCR signaling regulator variants in B6.Sle1/2/3 lupus mouse, but surface protein expression of these regulators on B cells showed an abnormal increase. CONCLUSION Our findings support that these BCR signaling regulator variants are potential causative genes of B cell hyperactivation in murine lupus models through their possible functional reduction.
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Affiliation(s)
- J Y Ju
- Department of Immunology, 372527Weifang Medical University, Weifang, China
| | - Z W Xu
- Department of Immunology, 372527Weifang Medical University, Weifang, China
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11
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Hallumi E, Shalah R, Lo WL, Corso J, Oz I, Beach D, Wittman S, Isenberg A, Sela M, Urlaub H, Weiss A, Yablonski D. Itk Promotes the Integration of TCR and CD28 Costimulation through Its Direct Substrates SLP-76 and Gads. THE JOURNAL OF IMMUNOLOGY 2021; 206:2322-2337. [PMID: 33931484 DOI: 10.4049/jimmunol.2001053] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Accepted: 03/15/2021] [Indexed: 11/19/2022]
Abstract
The costimulatory receptor CD28 synergizes with the TCR to promote IL-2 production, cell survival, and proliferation; yet the obligatory interdependence of TCR and CD28 signaling is not well understood. Upon TCR stimulation, Gads, a Grb2-family adaptor, bridges the interaction of two additional adaptors, LAT and SLP-76, to form a TCR-induced effector signaling complex. SLP-76 binds the Tec-family tyrosine kinase, Itk, which phosphorylates SLP-76 Y173 and PLC-γ1 Y783. In this study, we identified TCR-inducible, Itk-mediated phosphorylation of Gads Y45 in a human T cell line and in mouse primary T cells. Y45 is found within the N-terminal SH3 domain of Gads, an evolutionarily conserved domain with no known signaling function. Gads Y45 phosphorylation depended on the interaction of Gads with SLP-76 and on the dimerization-dependent binding of Gads to phospho-LAT. We provide evidence that Itk acts through SLP-76 and Gads to promote the TCR/CD28-induced activation of the RE/AP transcriptional element from the IL-2 promoter. Two Itk-related features of SLP-76, Y173 and a proline-rich Itk SH3 binding motif on SLP-76, were dispensable for activation of NFAT but selectively required for the TCR/CD28-induced increase in cytoplasmic and nuclear c-Rel and consequent RE/AP activation. We provide evidence that unphosphorylated, monomeric Gads mediates an RE/AP-directed inhibitory activity that is mitigated upon Gads dimerization and Y45 phosphorylation. This study illuminates a new, to our knowledge, regulatory module, in which TCR-induced, Itk-mediated phosphorylation sites on SLP-76 and Gads control the transcriptional response to TCR/CD28 costimulation, thus enforcing the obligatory interdependence of the TCR and CD28 signaling pathways.
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Affiliation(s)
- Enas Hallumi
- Department of Immunology, Ruth and Bruce Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa, Israel
| | - Rose Shalah
- Department of Immunology, Ruth and Bruce Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa, Israel
| | - Wan-Lin Lo
- Rosalind Russell and Ephraim P. Engleman Arthritis Research Center, Division of Rheumatology, Department of Medicine, University of California, San Francisco, San Francisco, CA
| | - Jasmin Corso
- Bioanalytical Mass Spectrometry Group, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Ilana Oz
- Department of Immunology, Ruth and Bruce Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa, Israel
| | - Dvora Beach
- Department of Immunology, Ruth and Bruce Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa, Israel
| | - Samuel Wittman
- Department of Immunology, Ruth and Bruce Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa, Israel
| | - Amy Isenberg
- Department of Immunology, Ruth and Bruce Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa, Israel
| | - Meirav Sela
- Department of Immunology, Ruth and Bruce Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa, Israel
| | - Henning Urlaub
- Bioanalytical Mass Spectrometry Group, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany.,Bioanalytics Research Group, Institute for Clinical Chemistry, University Medical Center Göttingen, Göttingen, Germany
| | - Arthur Weiss
- Rosalind Russell and Ephraim P. Engleman Arthritis Research Center, Division of Rheumatology, Department of Medicine, University of California, San Francisco, San Francisco, CA.,Howard Hughes Medical Institute, University of California, San Francisco, San Francisco, CA
| | - Deborah Yablonski
- Department of Immunology, Ruth and Bruce Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa, Israel
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12
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Lechner KS, Neurath MF, Weigmann B. Role of the IL-2 inducible tyrosine kinase ITK and its inhibitors in disease pathogenesis. J Mol Med (Berl) 2020; 98:1385-1395. [PMID: 32808093 PMCID: PMC7524833 DOI: 10.1007/s00109-020-01958-z] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2020] [Revised: 07/10/2020] [Accepted: 08/04/2020] [Indexed: 01/18/2023]
Abstract
ITK (IL-2-inducible tyrosine kinase) belongs to the Tec family kinases and is mainly expressed in T cells. It is involved in TCR signalling events driving processes like T cell development as well as Th2, Th9 and Th17 responses thereby controlling the expression of pro-inflammatory cytokines. Studies have shown that ITK is involved in the pathogenesis of autoimmune diseases as well as in carcinogenesis. The loss of ITK or its activity either by mutation or by the use of inhibitors led to a beneficial outcome in experimental models of asthma, inflammatory bowel disease and multiple sclerosis among others. In humans, biallelic mutations in the ITK gene locus result in a monogenetic disorder leading to T cell dysfunction; in consequence, mainly EBV infections can lead to severe immune dysregulation evident by lymphoproliferation, lymphoma and hemophagocytic lymphohistiocytosis. Furthermore, patients who suffer from angioimmunoblastic T cell lymphoma have been found to express significantly more ITK. These findings put ITK in the strong focus as a target for drug development.
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Affiliation(s)
- Kristina S Lechner
- Department of Medicine 1, Kussmaul Campus for Medical Research, University of Erlangen-Nürnberg, Hartmannstr.14, 91052, Erlangen, Germany
| | - Markus F Neurath
- Department of Medicine 1, Kussmaul Campus for Medical Research, University of Erlangen-Nürnberg, Hartmannstr.14, 91052, Erlangen, Germany
- Deutsches Zentrum Immuntherapie (DZI), Ulmenweg 18, 91054, Erlangen, Germany
- Ludwig Demling Endoscopy Center of Excellence, Ulmenweg 18, 91054, Erlangen, Germany
| | - Benno Weigmann
- Department of Medicine 1, Kussmaul Campus for Medical Research, University of Erlangen-Nürnberg, Hartmannstr.14, 91052, Erlangen, Germany.
- Medical Immunology Campus Erlangen, Medical Clinic 1, Friedrich-Alexander University Erlangen-Nürnberg, 91052, Erlangen, Germany.
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13
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Conley JM, Gallagher MP, Rao A, Berg LJ. Activation of the Tec Kinase ITK Controls Graded IRF4 Expression in Response to Variations in TCR Signal Strength. THE JOURNAL OF IMMUNOLOGY 2020; 205:335-345. [PMID: 32493815 DOI: 10.4049/jimmunol.1900853] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Accepted: 05/05/2020] [Indexed: 12/30/2022]
Abstract
TCR signal strength is critical for CD8+ T cell clonal expansion after Ag stimulation. Levels of the transcription factor IRF4 control the magnitude of this process through the induction of genes involved in proliferation and glycolytic metabolism. The signaling mechanism connecting graded TCR signaling to the generation of varying amounts of IRF4 is not well understood. In this study, we show that Ag potency regulates the kinetics but not the magnitude of NFAT1 activation in single mouse CD8+ T cells. Consequently, T cells that transduce weaker TCR signals exhibit a marked delay in Irf4 mRNA induction, resulting in decreased overall IRF4 expression in individual cells and increased heterogeneity within the clonal population. We further show that the activity of the tyrosine kinase ITK acts as a signaling catalyst that accelerates the rate of the cellular response to TCR stimulation, controlling the time to onset of Irf4 gene transcription. These findings provide insight into the function of ITK in TCR signal transduction that ultimately regulates IRF4 expression levels in response to variations in TCR signal strength.
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Affiliation(s)
- James M Conley
- Department of Immunology and Microbiology, University of Colorado School of Medicine, Aurora, CO 80045
| | - Michael P Gallagher
- Department of Pathology, University of Massachusetts Medical School, Worcester, MA 01605
| | - Anjana Rao
- Division of Signaling and Gene Expression, La Jolla Institute, San Diego, CA 92037; and.,Department of Pharmacology and Moores Cancer Center, University of California San Diego, La Jolla, CA 92037
| | - Leslie J Berg
- Department of Immunology and Microbiology, University of Colorado School of Medicine, Aurora, CO 80045; .,Department of Pathology, University of Massachusetts Medical School, Worcester, MA 01605
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14
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Udhaya Kumar S, Thirumal Kumar D, Siva R, George Priya Doss C, Younes S, Younes N, Sidenna M, Zayed H. Dysregulation of Signaling Pathways Due to Differentially Expressed Genes From the B-Cell Transcriptomes of Systemic Lupus Erythematosus Patients - A Bioinformatics Approach. Front Bioeng Biotechnol 2020; 8:276. [PMID: 32426333 PMCID: PMC7203449 DOI: 10.3389/fbioe.2020.00276] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2020] [Accepted: 03/16/2020] [Indexed: 12/17/2022] Open
Abstract
Systemic lupus erythematosus (SLE) is an autoimmune inflammatory disorder that is clinically complex and has increased production of autoantibodies. Via emerging technologies, researchers have identified genetic variants, expression profiling of genes, animal models, and epigenetic findings that have paved the way for a better understanding of the molecular and genetic mechanisms of SLE. Our current study aimed to illustrate the essential genes and molecular pathways that are potentially involved in the pathogenesis of SLE. This study incorporates the gene expression profiling data of the microarray dataset GSE30153 from the Gene Expression Omnibus (GEO) database, and differentially expressed genes (DEGs) between the B-cell transcriptomes of SLE patients and healthy controls were screened using the GEO2R web tool. The identified DEGs were subjected to STRING analysis and Cytoscape to explore the protein-protein interaction (PPI) networks between them. The MCODE (Molecular Complex Detection) plugin of Cytoscape was used to screen the cluster subnetworks that are highly interlinked between the DEGs. Subsequently, the clustered DEGs were subjected to functional annotation with ClueGO/CluePedia to identify the significant pathways that were enriched. For integrative analysis, we used GeneGo MetacoreTM, a Cortellis Solution software, to exhibit the Gene Ontology (GO) and enriched pathways between the datasets. Our study identified 4 upregulated and 13 downregulated genes. Analysis of GO and functional enrichment using ClueGO revealed the pathways that were statistically significant, including pathways involving T-cell costimulation, lymphocyte costimulation, negative regulation of vascular permeability, and B-cell receptor signaling. The DEGs were mainly enriched in metabolic networks such as the phosphatidylinositol-3,4,5-triphosphate pathway and the carnitine pathway. Additionally, potentially enriched pathways, such as the signaling pathways induced by oxidative stress and reactive oxygen species (ROS), chemotaxis and lysophosphatidic acid signaling induced via G protein-coupled receptors (GPCRs), and the androgen receptor activation pathway, were identified from the DEGs that were mainly associated with the immune system. Four genes (EGR1, CD38, CAV1, and AKT1) were identified to be strongly associated with SLE. Our integrative analysis using a multitude of bioinformatics tools might promote an understanding of the dysregulated pathways that are associated with SLE development and progression. The four DEGs in SLE patients might shed light on the pathogenesis of SLE and might serve as potential biomarkers in early diagnosis and as therapeutic targets for SLE.
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Affiliation(s)
- S. Udhaya Kumar
- School of Biosciences and Technology, Vellore Institute of Technology, Vellore, India
| | - D. Thirumal Kumar
- School of Biosciences and Technology, Vellore Institute of Technology, Vellore, India
| | - R. Siva
- School of Biosciences and Technology, Vellore Institute of Technology, Vellore, India
| | - C. George Priya Doss
- School of Biosciences and Technology, Vellore Institute of Technology, Vellore, India
| | - Salma Younes
- Department of Biomedical Sciences, College of Health and Sciences, QU Health, Qatar University, Doha, Qatar
| | - Nadin Younes
- Department of Biomedical Sciences, College of Health and Sciences, QU Health, Qatar University, Doha, Qatar
| | - Mariem Sidenna
- Department of Biomedical Sciences, College of Health and Sciences, QU Health, Qatar University, Doha, Qatar
| | - Hatem Zayed
- Department of Biomedical Sciences, College of Health and Sciences, QU Health, Qatar University, Doha, Qatar
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15
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Tuning T helper cell differentiation by ITK. Biochem Soc Trans 2020; 48:179-185. [PMID: 32049330 DOI: 10.1042/bst20190486] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Revised: 12/28/2019] [Accepted: 01/13/2020] [Indexed: 12/24/2022]
Abstract
CD4+ effector T cells effectuate T cell immune responses, producing cytokines to orchestrate the nature and type of immune responses. The non-receptor tyrosine kinase IL-2 inducible T cell kinase (ITK), a mediator of T cell Receptor signaling, plays a critical role in tuning the development of these effector cells. In this review we discussed the role that signals downstream of ITK, including the Ras/MAPK pathway, play in differentially controlling the differentiation of TH17, Foxp3+ T regulatory (Treg) cells, and Type 1 regulatory T (Tr1) cells, supporting a model of ITK signals controlling a decision point in the effector T cell differentiation process.
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16
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Latour S, Fischer A. Signaling pathways involved in the T-cell-mediated immunity against Epstein-Barr virus: Lessons from genetic diseases. Immunol Rev 2020; 291:174-189. [PMID: 31402499 DOI: 10.1111/imr.12791] [Citation(s) in RCA: 86] [Impact Index Per Article: 17.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Revised: 06/05/2019] [Accepted: 06/10/2019] [Indexed: 12/13/2022]
Abstract
Primary immunodeficiencies (PIDs) provide researchers with unique models to understand in vivo immune responses in general and immunity to infections in particular. In humans, impaired immune control of Epstein-Barr virus (EBV) infection is associated with the occurrence of several different immunopathologic conditions; these include non-malignant and malignant B-cell lymphoproliferative disorders, hemophagocytic lymphohistiocytosis (HLH), a severe inflammatory condition, and a chronic acute EBV infection of T cells. Studies of PIDs associated with a predisposition to develop severe, chronic EBV infections have led to the identification of key components of immunity to EBV - notably the central role of T-cell expansion and its regulation in the pathophysiology of EBV-associated diseases. On one hand, the defective expansion of EBV-specific CD8 T cells results from mutations in genes involved in T-cell activation (such as RASGRP1, MAGT1, and ITK), DNA metabolism (CTPS1) or co-stimulatory pathways (CD70, CD27, and TNFSFR9 (also known as CD137/4-1BB)) leads to impaired elimination of proliferating EBV-infected B cells and the occurrence of lymphoma. On the other hand, protracted T-cell expansion and activation after the defective killing of EBV-infected B cells is caused by genetic defects in the components of the lytic granule exocytosis pathway or in the small adapter protein SH2D1A (also known as SAP), a key activator of T- and NK cell-cytotoxicity. In this setting, the persistence of EBV-infected cells results in HLH, a condition characterized by unleashed T-cell and macrophage activation. Moreover, genetic defects causing selective vulnerability to EBV infection have highlighted the role of co-receptor molecules (CD27, CD137, and SLAM-R) selectively involved in immune responses against infected B cells via specific T-B cell interactions.
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Affiliation(s)
- Sylvain Latour
- Laboratory of Lymphocyte Activation and Susceptibility to EBV infection, Inserm UMR 1163, Paris, France.,University Paris Descartes Sorbonne Paris Cité, Imagine Institut, Paris, France
| | - Alain Fischer
- University Paris Descartes Sorbonne Paris Cité, Imagine Institut, Paris, France.,Department of Pediatric Immunology, Hematology and Rheumatology, Necker-Enfants Malades Hospital, Assistance Publique-Hôpitaux de Paris (APHP), Paris, France.,Collège de France, Paris, France.,Inserm UMR 1163, Paris, France
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17
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Huang L, Ye K, McGee MC, Nidetz NF, Elmore JP, Limper CB, Southard TL, Russell DG, August A, Huang W. Interleukin-2-Inducible T-Cell Kinase Deficiency Impairs Early Pulmonary Protection Against Mycobacterium tuberculosis Infection. Front Immunol 2020; 10:3103. [PMID: 32038633 PMCID: PMC6993117 DOI: 10.3389/fimmu.2019.03103] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Accepted: 12/19/2019] [Indexed: 11/13/2022] Open
Abstract
Interleukin-2 (IL-2) inducible T-cell kinase (ITK) is a non-receptor tyrosine kinase highly expressed in T-cell lineages and regulates multiple aspects of T-cell development and function, mainly through its function downstream of the T-cell receptor. Itk deficiency can lead to CD4 lymphopenia and Epstein-Bar virus (EBV)-associated lymphoproliferation and recurrent pulmonary infections in humans. However, the role of the ITK signaling pathway in pulmonary responses in active tuberculosis due to Mtb infection is not known. We show here that human lungs with active tuberculosis exhibit altered T-cell receptor/ITK signaling and that Itk deficiency impaired early protection against Mtb in mice, accompanied by defective development of IL-17A-producing γδ T cells in the lungs. These findings have important implications of human genetics associated with susceptibility to Mtb due to altered immune responses and molecular signals modulating host immunity that controls Mtb activity. Enhancing ITK signaling pathways may be an alternative strategy to target Mtb infection, especially in cases with highly virulent strains in which IL-17A plays an essential protective role.
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Affiliation(s)
- Lu Huang
- Department of Microbiology and Immunology, College of Veterinary Medicine, Cornell University, Ithaca, NY, United States
| | - Kaixiong Ye
- Department of Genetics, University of Georgia, Athens, GA, United States.,Institute of Bioinformatics, University of Georgia, Athens, GA, United States
| | - Michael C McGee
- Department of Pathobiological Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA, United States
| | - Natalie F Nidetz
- Department of Pathobiological Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA, United States
| | - Jessica P Elmore
- Department of Microbiology and Immunology, College of Veterinary Medicine, Cornell University, Ithaca, NY, United States
| | - Candice B Limper
- Department of Microbiology and Immunology, College of Veterinary Medicine, Cornell University, Ithaca, NY, United States
| | - Teresa L Southard
- Department of Biomedical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY, United States
| | - David G Russell
- Department of Microbiology and Immunology, College of Veterinary Medicine, Cornell University, Ithaca, NY, United States
| | - Avery August
- Department of Microbiology and Immunology, College of Veterinary Medicine, Cornell University, Ithaca, NY, United States
| | - Weishan Huang
- Department of Microbiology and Immunology, College of Veterinary Medicine, Cornell University, Ithaca, NY, United States.,Department of Pathobiological Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA, United States
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18
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Design, synthesis and structure-activity relationship of indolylindazoles as potent and selective covalent inhibitors of interleukin-2 inducible T-cell kinase (ITK). Eur J Med Chem 2019; 187:111918. [PMID: 31830635 DOI: 10.1016/j.ejmech.2019.111918] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2019] [Revised: 09/29/2019] [Accepted: 11/25/2019] [Indexed: 11/23/2022]
Abstract
Interleukin-2 inducible T-cell kinase (ITK), a member of the Tec family of tyrosine kinases, plays an important role in T cell signaling downstream of the T-cell receptor (TCR). Herein we report the discovery of a series of indolylindazole based covalent ITK inhibitors with nanomolar inhibitory potency against ITK, good kinase selectivity and potent inhibition of the phosphorylation of PLCγ1 and ERK1/2 in living cells. A computational study provided insight into the interactions between inhibitors and Phe437 at the ATP binding pocket of ITK, suggesting that both edge-to-face π-π interaction and the dihedral torsion angle contribute to inhibitors' potency. Compounds 43 and 55 stood out as selective covalent inhibitors with potent cellular activity, which could be used as chemical tools for further study of ITK functions.
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19
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Andreotti AH, Joseph RE, Conley JM, Iwasa J, Berg LJ. Multidomain Control Over TEC Kinase Activation State Tunes the T Cell Response. Annu Rev Immunol 2019; 36:549-578. [PMID: 29677469 DOI: 10.1146/annurev-immunol-042617-053344] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Signaling through the T cell antigen receptor (TCR) activates a series of tyrosine kinases. Directly associated with the TCR, the SRC family kinase LCK and the SYK family kinase ZAP-70 are essential for all downstream responses to TCR stimulation. In contrast, the TEC family kinase ITK is not an obligate component of the TCR cascade. Instead, ITK functions as a tuning dial, to translate variations in TCR signal strength into differential programs of gene expression. Recent insights into TEC kinase structure have provided a view into the molecular mechanisms that generate different states of kinase activation. In resting lymphocytes, TEC kinases are autoinhibited, and multiple interactions between the regulatory and kinase domains maintain low activity. Following TCR stimulation, newly generated signaling modules compete with the autoinhibited core and shift the conformational ensemble to the fully active kinase. This multidomain control over kinase activation state provides a structural mechanism to account for ITK's ability to tune the TCR signal.
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Affiliation(s)
- Amy H Andreotti
- Roy J. Carver Department of Biochemistry, Biophysics and Molecular Biology, Iowa State University, Ames, Iowa 50011, USA; ,
| | - Raji E Joseph
- Roy J. Carver Department of Biochemistry, Biophysics and Molecular Biology, Iowa State University, Ames, Iowa 50011, USA; ,
| | - James M Conley
- Department of Pathology, University of Massachusetts Medical School, Worcester, Massachusetts 01655, USA; ,
| | - Janet Iwasa
- Department of Biochemistry, University of Utah, Salt Lake City, Utah 84112, USA;
| | - Leslie J Berg
- Department of Pathology, University of Massachusetts Medical School, Worcester, Massachusetts 01655, USA; ,
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20
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Xie J, Han X, Zhao C, Canonigo-Balancio AJ, Yates JR, Li Y, Lillemeier BF, Altman A. Phosphotyrosine-dependent interaction between the kinases PKCθ and Zap70 promotes proximal TCR signaling. Sci Signal 2019; 12:12/577/eaar3349. [PMID: 30992398 DOI: 10.1126/scisignal.aar3349] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Protein kinase C-θ (PKCθ) is an important component of proximal T cell receptor (TCR) signaling. We previously identified the amino-terminal C2 domain of PKCθ as a phosphotyrosine (pTyr)-binding domain. Using a mutant form of PKCθ that cannot bind pTyr (PKCθHR2A), we showed that pTyr binding by PKCθ was required for TCR-induced T cell activation, proliferation, and TH2 cell differentiation but not for T cell development. Using tandem mass spectrometry and coimmunoprecipitation, we identified the kinase ζ-associated protein kinase of 70 kDa (Zap70) as a binding partner of the PKCθ pTyr-binding pocket. Tyr126 of Zap70 directly bound to PKCθ, and the interdomain B residues Tyr315 and Tyr319 were indirectly required for binding to PKCθ, reflecting their role in promoting the open conformation of Zap70. PKCθHR2A-expressing CD4+ T cells displayed defects not only in known PKCθ-dependent signaling events, such as nuclear factor κB (NF-κB) activation and TH2 cell differentiation, but also in full activation of Zap70 itself and in the activating phosphorylation of linker of activation of T cells (LAT) and phospholipase C-γ1 (PLCγ1), signaling proteins that are traditionally considered to be activated independently of PKC. These findings demonstrate that PKCθ plays an important role in a positive feedback regulatory loop that modulates TCR-proximal signaling and, moreover, provide a mechanistic explanation for earlier reports that documented an important role for PKCθ in T cell Ca2+ signaling. This PKCθ-Zap70 interaction could potentially serve as a promising and highly selective immunosuppressive drug target in autoimmunity and organ transplantation.
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Affiliation(s)
- Jiji Xie
- Division of Cell Biology, La Jolla Institute for Immunology, La Jolla, CA 92037, USA
| | - Xuemei Han
- Department of Chemical Physiology, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Chensi Zhao
- State Key Laboratory for Biocontrol, School of Life Science, Sun Yat-sen University, Guangzhou 510006, China
| | | | - John R Yates
- Department of Chemical Physiology, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Yingqiu Li
- State Key Laboratory for Biocontrol, School of Life Science, Sun Yat-sen University, Guangzhou 510006, China
| | - Björn F Lillemeier
- Nomis Center for Immunobiology and Microbial Pathogenesis & Waitt Advanced Biophotonics Center, Salk Institute for Biological Studies, La Jolla, CA 92037, USA
| | - Amnon Altman
- Division of Cell Biology, La Jolla Institute for Immunology, La Jolla, CA 92037, USA.
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21
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Interleukin-2-inducible T-cell kinase inhibitors modify functional polarization of human peripheral T-cell lymphoma cells. Blood Adv 2019; 3:705-710. [PMID: 30814054 DOI: 10.1182/bloodadvances.2018027821] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2018] [Accepted: 01/07/2019] [Indexed: 11/20/2022] Open
Abstract
Key Points
ITK inhibitors perturb functional changes due to polarizing culture conditions in normal human tonsil CD4+ T cells. Primary human PTCL cells alter their functional properties in culture and ITK inhibitors modify these changes.
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22
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Wang QL, Liang JQ, Gong BN, Xie JJ, Yi YT, Lan X, Li Y. T Cell Receptor (TCR)-Induced PLC-γ1 Sumoylation via PIASxβ and PIAS3 SUMO E3 Ligases Regulates the Microcluster Assembly and Physiological Function of PLC-γ1. Front Immunol 2019; 10:314. [PMID: 30873169 PMCID: PMC6403162 DOI: 10.3389/fimmu.2019.00314] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2018] [Accepted: 02/06/2019] [Indexed: 11/16/2022] Open
Abstract
The SUMO modification system plays an important role in T cell activation, yet how sumoylation regulates TCR-proximal signaling remains largely unknown. We show here that Phospholipase C-γ1 (PLC-γ1) is conjugated by SUMO1 at K54 and K987 upon TCR stimulation and that K54 sumoylation is pivotal for PLC-γ1-mediated T cell activation. We further demonstrate that TCR-induced K54 sumoylation of PLC-γ1 significantly promotes the formation of PLC-γ1 microclusters and the association of PLC-γ1 with the adaptor proteins SLP76 and Gads, but only slightly affects the phosphorylation of PLC-γ1 on Y783, which determines the enzyme catalytic activity. Moreover, upon TCR stimulation, the SUMO E3 ligases PIASxβ and PIAS3 both interact with PLC-γ1 and cooperate to sumoylate PLC-γ1, facilitating the assembly of PLC-γ1 microclusters. Together, our findings reveal a critical role of PLC-γ1 K54 sumoylation in PLC-γ1 microcluster assembly that controls PLC-γ1-mediated T cell activation, suggesting that sumoylation may have an important role in the microcluster assembly of TCR-proximal signaling proteins.
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Affiliation(s)
- Qi-Long Wang
- MOE Key Laboratory of Gene Function and Regulation, State Key Laboratory of Biocontrol, Sun Yat-sen University, Guangzhou, China.,School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Jia-Qi Liang
- MOE Key Laboratory of Gene Function and Regulation, State Key Laboratory of Biocontrol, Sun Yat-sen University, Guangzhou, China.,School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Bei-Ni Gong
- MOE Key Laboratory of Gene Function and Regulation, State Key Laboratory of Biocontrol, Sun Yat-sen University, Guangzhou, China.,School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Ji-Ji Xie
- MOE Key Laboratory of Gene Function and Regulation, State Key Laboratory of Biocontrol, Sun Yat-sen University, Guangzhou, China.,School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Yu-Ting Yi
- MOE Key Laboratory of Gene Function and Regulation, State Key Laboratory of Biocontrol, Sun Yat-sen University, Guangzhou, China.,School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Xin Lan
- MOE Key Laboratory of Gene Function and Regulation, State Key Laboratory of Biocontrol, Sun Yat-sen University, Guangzhou, China.,School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Yingqiu Li
- MOE Key Laboratory of Gene Function and Regulation, State Key Laboratory of Biocontrol, Sun Yat-sen University, Guangzhou, China.,School of Life Sciences, Sun Yat-sen University, Guangzhou, China
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23
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Latour S, Winter S. Inherited Immunodeficiencies With High Predisposition to Epstein-Barr Virus-Driven Lymphoproliferative Diseases. Front Immunol 2018; 9:1103. [PMID: 29942301 PMCID: PMC6004768 DOI: 10.3389/fimmu.2018.01103] [Citation(s) in RCA: 74] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2018] [Accepted: 05/02/2018] [Indexed: 01/16/2023] Open
Abstract
Epstein–Barr Virus (EBV) is a gamma-herpes virus that infects 90% of humans without any symptoms in most cases, but has an oncogenic potential, especially in immunocompromised individuals. In the past 30 years, several primary immunodeficiencies (PIDs) associated with a high risk to develop EBV-associated lymphoproliferative disorders (LPDs), essentially consisting of virus-associated hemophagocytic syndrome, non-malignant and malignant B-cell LPDs including non-Hodgkin and Hodgkin’s types of B lymphomas have been characterized. Among them are SH2D1A (SAP), XIAP, ITK, MAGT1, CD27, CD70, CTPS1, RASGRP1, and CORO1A deficiencies. Penetrance of EBV infection ranges from 50 to 100% in those PIDs. Description of large cohorts and case reports has refined the specific phenotypes associated with these PIDs helping to the diagnosis. Specific pathways required for protective immunity to EBV have emerged from studies of these PIDs. SLAM-associated protein-dependent SLAM receptors and MAGT1-dependent NKG2D pathways are important for T and NK-cell cytotoxicity toward EBV-infected B-cells, while CD27–CD70 interactions are critical to drive the expansion of EBV-specific T-cells. CTPS1 and RASGRP1 deficiencies further strengthen that T-lymphocyte expansion is a key step in the immune response to EBV. These pathways appear to be also important for the anti-tumoral immune surveillance of abnormal B cells. Monogenic PIDs should be thus considered in case of any EBV-associated LPDs.
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Affiliation(s)
- Sylvain Latour
- Laboratory of Lymphocyte Activation and Susceptibility to EBV infection, INSERM UMR 1163, Paris, France.,Imagine Institute, Paris Descartes University, Sorbonne Paris Cité, Paris, France.,Equipe de Recherche Labéllisée, Ligue National contre le Cancer, Paris, France
| | - Sarah Winter
- Laboratory of Lymphocyte Activation and Susceptibility to EBV infection, INSERM UMR 1163, Paris, France.,Imagine Institute, Paris Descartes University, Sorbonne Paris Cité, Paris, France.,Equipe de Recherche Labéllisée, Ligue National contre le Cancer, Paris, France
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24
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Kabanova A, Zurli V, Baldari CT. Signals Controlling Lytic Granule Polarization at the Cytotoxic Immune Synapse. Front Immunol 2018. [PMID: 29515593 PMCID: PMC5826174 DOI: 10.3389/fimmu.2018.00307] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
Cytotoxic immunity relies on specialized effector T cells, the cytotoxic T cells, which are endowed with specialized cytolytic machinery that permits them to induce death of their targets. Upon recognition of a target cell, cytotoxic T cells form a lytic immune synapse and by docking the microtubule-organizing center at the synaptic membrane get prepared to deliver a lethal hit of enzymes contained in lytic granules. New insights suggest that the directionality of lytic granule trafficking along the microtubules represents a fine means to tune the functional outcome of the encounter between a T cell and its target. Thus, mechanisms regulating the directionality of granule transport may have a major impact in settings characterized by evasion from the cytotoxic response, such as chronic infection and cancer. Here, we review our current knowledge on the signaling pathways implicated in the polarized trafficking at the immune synapse of cytotoxic T cells, complementing it with information on the regulation of this process in natural killer cells. Furthermore, we highlight some of the parameters which we consider critical in studying the polarized trafficking of lytic granules, including the use of freshly isolated cytotoxic T cells, and discuss some of the major open questions.
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Affiliation(s)
- Anna Kabanova
- Department of Life Sciences, University of Siena, Siena, Italy
| | - Vanessa Zurli
- Department of Life Sciences, University of Siena, Siena, Italy
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25
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von Raußendorf F, de Ruiter A, Leonard TA. A switch in nucleotide affinity governs activation of the Src and Tec family kinases. Sci Rep 2017; 7:17405. [PMID: 29234112 PMCID: PMC5727165 DOI: 10.1038/s41598-017-17703-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2017] [Accepted: 11/29/2017] [Indexed: 11/10/2022] Open
Abstract
The Tec kinases, closely related to Src family kinases, are essential for lymphocyte function in the adaptive immune system. Whilst the Src and Abl kinases are regulated by tail phosphorylation and N-terminal myristoylation respectively, the Tec kinases are notable for the absence of either regulatory element. We have found that the inactive conformations of the Tec kinase Itk and Src preferentially bind ADP over ATP, stabilising both proteins. We demonstrate that Itk adopts the same conformation as Src and that the autoinhibited conformation of Src is independent of its C-terminal tail. Allosteric activation of both Itk and Src depends critically on the disruption of a conserved hydrophobic stack that accompanies regulatory domain displacement. We show that a conformational switch permits the exchange of ADP for ATP, leading to efficient autophosphorylation and full activation. In summary, we propose a universal mechanism for the activation and autoinhibition of the Src and Tec kinases.
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Affiliation(s)
- Freia von Raußendorf
- Department of Structural and Computational Biology, Max F. Perutz Laboratories (MFPL), Campus Vienna Biocenter 5, 1030, Vienna, Austria
| | - Anita de Ruiter
- Institute of Molecular Modeling and Simulation, University of Natural Resources and Life Sciences (BOKU), 1190, Vienna, Austria
| | - Thomas A Leonard
- Department of Structural and Computational Biology, Max F. Perutz Laboratories (MFPL), Campus Vienna Biocenter 5, 1030, Vienna, Austria.
- Department of Medical Biochemistry, Medical University of Vienna, 1090, Vienna, Austria.
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26
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Molecular mechanisms underlying the evolution of the slp76 signalosome. Sci Rep 2017; 7:1509. [PMID: 28473706 PMCID: PMC5431462 DOI: 10.1038/s41598-017-01660-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Accepted: 03/29/2017] [Indexed: 02/07/2023] Open
Abstract
The well-defined mammalian slp76-signalosome is crucial for T-cell immune response, yet whether slp76-signalosome exists in invertebrates and how it evolved remain unknown. Here we investigated slp76-signalosome from an evolutionary perspective in amphioxus Branchiostoma belcheri (bb). We proved slp76-signalosome components bbslp76, bbGADS and bbItk are present in amphioxus and bbslp76 interacts with bbGADS and bbItk, but differences exist between the interaction manners within slp76-signalosome components of amphioxus and human (h). Specifically, bbslp76 has a unique WW-domain that blocked its association with hItk and decreased TCR-induced tyrosine-phosphorylation and NFAT-activation. Deletion of WW-domain shifted the constitutive association between bbslp76 and hPLCγ1 to a TCR-enhanced association. Among slp76-signalosome, the interaction between slp76 and PLCγ1 is the most conserved and the binding between Itk and slp76 evolved from constitutive to stimulation-regulated. Sequence alignment and 3D structural analysis of slp76-signalosome molecules from keystone species indicated slp76 evolved into a more unfolded and flexible adaptor due to lack of WW-domain and several low-complexity-regions (LCRs) while GADS turned into a larger protein by a LCR gain, thus preparing more space for nucleating the coevolving slp76-signalosome. Altogether, through deletion of WW-domain and manipulation of LCRs, slp76-signalosome evolves from a rigid and stimulation-insensitive to a more flexible and stimulation-responding complex.
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27
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Kapnick SM, Stinchcombe JC, Griffiths GM, Schwartzberg PL. Inducible T Cell Kinase Regulates the Acquisition of Cytolytic Capacity and Degranulation in CD8 + CTLs. THE JOURNAL OF IMMUNOLOGY 2017; 198:2699-2711. [PMID: 28213500 DOI: 10.4049/jimmunol.1601202] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2016] [Accepted: 01/19/2017] [Indexed: 12/22/2022]
Abstract
Patients with mutations in inducible T cell kinase (ITK) are susceptible to viral infections, particularly EBV, suggesting that these patients have defective function of CD8+ CTLs. In this study, we evaluated the effects of ITK deficiency on cytolysis in murine CTLs deficient in ITK, and both human and murine cells treated with an ITK inhibitor. We find that ITK deficiency leads to a global defect in the cytolysis of multiple targets. The absence of ITK both affected CTL expansion and delayed the expression of cytolytic effectors during activation. Furthermore, absence of ITK led to a previously unappreciated intrinsic defect in degranulation. Nonetheless, these defects could be overcome by early or prolonged exposure to IL-2, or by addition of IL-12 to cultures, revealing that cytokine signaling could restore the acquisition of effector function in ITK-deficient CD8+ T cells. Our results provide new insight into the effect of ITK and suboptimal TCR signaling on CD8+ T cell function, and how these may contribute to phenotypes associated with ITK deficiency.
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Affiliation(s)
- Senta M Kapnick
- National Human Genome Research Institute, Bethesda, MD 20892; and
| | - Jane C Stinchcombe
- Cambridge Institute for Medical Research, University of Cambridge, Cambridge CB2 0XY, United Kingdom
| | - Gillian M Griffiths
- Cambridge Institute for Medical Research, University of Cambridge, Cambridge CB2 0XY, United Kingdom
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28
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Izawa K, Martin E, Soudais C, Bruneau J, Boutboul D, Rodriguez R, Lenoir C, Hislop AD, Besson C, Touzot F, Picard C, Callebaut I, de Villartay JP, Moshous D, Fischer A, Latour S. Inherited CD70 deficiency in humans reveals a critical role for the CD70-CD27 pathway in immunity to Epstein-Barr virus infection. J Exp Med 2016; 214:73-89. [PMID: 28011863 PMCID: PMC5206497 DOI: 10.1084/jem.20160784] [Citation(s) in RCA: 115] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2016] [Revised: 08/13/2016] [Accepted: 10/25/2016] [Indexed: 12/13/2022] Open
Abstract
Izawa et al. identify the first patient with CD70 deficiency suffering from recurrent EBV-induced B cell proliferations including Hodgkin’s lymphoma. Expression of CD70 on B cells is necessary to induce proliferation of EBV-specific T cells. Epstein-Barr virus (EBV) infection in humans is a major trigger of malignant and nonmalignant B cell proliferations. CD27 is a co-stimulatory molecule of T cells, and inherited CD27 deficiency is characterized by high susceptibility to EBV infection, though the underlying pathological mechanisms have not yet been identified. In this study, we report a patient suffering from recurrent EBV-induced B cell proliferations including Hodgkin’s lymphoma because of a deficiency in CD70, the ligand of CD27. We show that EBV-specific T lymphocytes did not expand properly when stimulated with CD70-deficient EBV-infected B cells, whereas expression of CD70 in B cells restored expansion, indicating that CD70 on B cells but not on T cells is required for efficient proliferation of T cells. CD70 was found to be up-regulated on B cells when activated and during EBV infection. The proliferation of T cells triggered by CD70-expressing B cells was dependent on CD27 and CD3 on T cells. Importantly, CD27-deficient T cells failed to proliferate when stimulated with CD70-expressing B cells. Thus, the CD70–CD27 pathway appears to be a crucial component of EBV-specific T cell immunity and more generally for the immune surveillance of B cells and may be a target for immunotherapy of B cell malignancies.
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Affiliation(s)
- Kazushi Izawa
- Laboratory of Lymphocyte Activation and Susceptibility to EBV infection, Institut National de la Santé et de la Recherche Médicale UMR 1163, 75015 Paris, France
| | - Emmanuel Martin
- Laboratory of Lymphocyte Activation and Susceptibility to EBV infection, Institut National de la Santé et de la Recherche Médicale UMR 1163, 75015 Paris, France
| | - Claire Soudais
- Laboratory of Lymphocyte Activation and Susceptibility to EBV infection, Institut National de la Santé et de la Recherche Médicale UMR 1163, 75015 Paris, France.,University Paris Descartes Sorbonne Paris Cité, Imagine Institut, 75015 Paris, France
| | - Julie Bruneau
- University Paris Descartes Sorbonne Paris Cité, Imagine Institut, 75015 Paris, France.,Department of Pathology, Necker-Enfants Malades Hospital, Assistance Publique-Hôpitaux de Paris, 75015 Paris, France
| | - David Boutboul
- Laboratory of Lymphocyte Activation and Susceptibility to EBV infection, Institut National de la Santé et de la Recherche Médicale UMR 1163, 75015 Paris, France
| | - Rémy Rodriguez
- Laboratory of Lymphocyte Activation and Susceptibility to EBV infection, Institut National de la Santé et de la Recherche Médicale UMR 1163, 75015 Paris, France.,University Paris Descartes Sorbonne Paris Cité, Imagine Institut, 75015 Paris, France
| | - Christelle Lenoir
- Laboratory of Lymphocyte Activation and Susceptibility to EBV infection, Institut National de la Santé et de la Recherche Médicale UMR 1163, 75015 Paris, France
| | - Andrew D Hislop
- School of Cancer Sciences, University of Birmingham, Birmingham B15 2TT, England, UK
| | - Caroline Besson
- Department of Biological Hematology and Immunology, Bicêtre Hospital, Assistance Publique-Hôpitaux de Paris, 94270 Le Kremlin-Bicêtre, France
| | - Fabien Touzot
- University Paris Descartes Sorbonne Paris Cité, Imagine Institut, 75015 Paris, France.,Department of Biotherapy, Necker-Enfants Malades Hospital, Assistance Publique-Hôpitaux de Paris, 75015 Paris, France
| | - Capucine Picard
- Laboratory of Human Genetics of Infectious Diseases, Institut National de la Santé et de la Recherche Médicale UMR 1163, 75015 Paris, France.,University Paris Descartes Sorbonne Paris Cité, Imagine Institut, 75015 Paris, France.,Centre d'Etude des Déficits Immunitaires, Necker-Enfants Malades Hospital, Assistance Publique-Hôpitaux de Paris, 75015 Paris, France.,Department of Pediatric Immunology, Hematology, and Rheumatology, Necker-Enfants Malades Hospital, Assistance Publique-Hôpitaux de Paris, 75015 Paris, France
| | - Isabelle Callebaut
- Centre National de la Recherche Scientifique UMR 7590, Sorbonne Universities, University Pierre et Marie Curie-Paris 6-MNHN-IRD-IUC, 75005 Paris, France
| | - Jean-Pierre de Villartay
- Laboratory of Dynamic of Genome and Immune System, Institut National de la Santé et de la Recherche Médicale UMR 1163, 75015 Paris, France.,University Paris Descartes Sorbonne Paris Cité, Imagine Institut, 75015 Paris, France
| | - Despina Moshous
- Laboratory of Dynamic of Genome and Immune System, Institut National de la Santé et de la Recherche Médicale UMR 1163, 75015 Paris, France.,University Paris Descartes Sorbonne Paris Cité, Imagine Institut, 75015 Paris, France.,Department of Pediatric Immunology, Hematology, and Rheumatology, Necker-Enfants Malades Hospital, Assistance Publique-Hôpitaux de Paris, 75015 Paris, France
| | - Alain Fischer
- University Paris Descartes Sorbonne Paris Cité, Imagine Institut, 75015 Paris, France.,Department of Pediatric Immunology, Hematology, and Rheumatology, Necker-Enfants Malades Hospital, Assistance Publique-Hôpitaux de Paris, 75015 Paris, France.,Collège de France, 75005 Paris, France.,Institut National de la Santé et de la Recherche Médicale UMR 1163, 75015 Paris, France
| | - Sylvain Latour
- Laboratory of Lymphocyte Activation and Susceptibility to EBV infection, Institut National de la Santé et de la Recherche Médicale UMR 1163, 75015 Paris, France .,University Paris Descartes Sorbonne Paris Cité, Imagine Institut, 75015 Paris, France
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Fu G, Yu M, Chen Y, Zheng Y, Zhu W, Newman DK, Wang D, Wen R. Phospholipase Cγ1 is required for pre-TCR signal transduction and pre-T cell development. Eur J Immunol 2016; 47:74-83. [PMID: 27759161 DOI: 10.1002/eji.201646522] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2016] [Revised: 09/14/2016] [Accepted: 10/17/2016] [Indexed: 12/23/2022]
Abstract
Pre-T cell receptor (TCR) signaling is required for pre-T cell survival, proliferation, and differentiation from the CD4 and CD8 double negative (DN) to the double positive (DP) stage. However, the pre-TCR signal transduction pathway is not fully understood and the signaling molecules involved have not been completely identified. Phospholipase Cγ (PLCγ) 1 is an important signaling molecule that generates two second messengers, diacylglycerol and inositol 1,4,5-trisphosphate, that are important to mediate PKC activation and intracellular Ca2+ flux in many signaling pathways. Previously, we have shown that PLCγ1 is important for TCR-mediated signaling, development and T-cell activation, but the role of PLCγ1 in pre-TCR signal transduction and pre-T cell development is not known. In this study, we demonstrated that PLCγ1 expression level in pre-T cells was comparable to that in mature T cells. Deletion of PLCγ1 prior to the pre-TCR signaling stage partially blocked the DN3 to DN4 transition and reduced thymic cellularity. We also demonstrated that deletion of PLCγ1 impaired pre-T cell proliferation without affecting cell survival. Further study showed that deficiency of PLCγ1 impaired pre-TCR mediated Ca2+ flux and Erk activation. Thus our studies demonstrate that PLCγ1 is important for pre-TCR mediated signal transduction and pre-T cell development.
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Affiliation(s)
- Guoping Fu
- The Blood Research Institute, BloodCenter of Wisconsin, Milwaukee, WI, USA
| | - Mei Yu
- The Blood Research Institute, BloodCenter of Wisconsin, Milwaukee, WI, USA
| | - Yuhong Chen
- The Blood Research Institute, BloodCenter of Wisconsin, Milwaukee, WI, USA
| | - Yongwei Zheng
- The Blood Research Institute, BloodCenter of Wisconsin, Milwaukee, WI, USA
| | - Wen Zhu
- The Blood Research Institute, BloodCenter of Wisconsin, Milwaukee, WI, USA.,Interdisciplinary Program in Biomedical Science, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Debra K Newman
- The Blood Research Institute, BloodCenter of Wisconsin, Milwaukee, WI, USA.,Department of Pharmacology and Toxicology, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Demin Wang
- The Blood Research Institute, BloodCenter of Wisconsin, Milwaukee, WI, USA.,Department of Microbiology and Molecular Genetics, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Renren Wen
- The Blood Research Institute, BloodCenter of Wisconsin, Milwaukee, WI, USA
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30
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Xu WD, Su LC, Xie QB, Zhao Y, Liu Y. Interleukin-2-inducible T-cell kinase expression and relation to disease severity in systemic lupus erythematosus. Clin Chim Acta 2016; 463:11-17. [PMID: 27729219 DOI: 10.1016/j.cca.2016.10.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2016] [Revised: 09/24/2016] [Accepted: 10/07/2016] [Indexed: 02/05/2023]
Abstract
BACKGROUND Interleukin-2 inducible T-cell kinase (ITK) is expressed in T cells, and plays an important role in autoimmune inflammatory diseases through regulating the balance of Th17/Treg. However, its role in human systemic lupus erythematosus (SLE) remains unclear. The present study aims to measure the activation status of ITK in T cells from SLE patients and healthy controls, and identify its possible correlation to disease severity. We also discuss the serum levels of Th17, Treg related cytokines including IL-17, IL-21, IL-22, IL-10, analyzing correlation between ITK and Th17/Treg related cytokines. METHODS Peripheral blood samples were drawn from 42 patients with SLE and 43 healthy blood donors, and the phosphorylation of ITK protein was studied in T cells using flow cytometry. In addition, serum levels of Th17/Treg related cytokines were studied with enzyme-linked immunosorbent assay (ELISA). RESULTS Percentages of CD4+pITK+ T cells, CD8+pITK+ T cells were higher in SLE patients compared with controls, and were positively related to disease activity, some clinical and laboratory parameters. Percentages of CD4+pITK+ T cells, CD8+pITK+ T cells were more prominent in active SLE patients compared with less active patients. Serum levels of Th17 and Treg related cytokines were higher in patients compared with controls. CD4+pITK+ T cells were related to levels of IL-17, IL-21. CONCLUSION These data indicate that increased ITK expression could act as a disease activity marker and as a risk factor for involvement in SLE, but it still needs further study to confirm.
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Affiliation(s)
- Wang-Dong Xu
- Department of Rheumatology and Immunology, West China Hospital, Sichuan University, 37 Guoxue Xiang, Chengdu, Sichuan 610041, PR China
| | - Lin-Chong Su
- Department of Rheumatology and Immunology, West China Hospital, Sichuan University, 37 Guoxue Xiang, Chengdu, Sichuan 610041, PR China
| | - Qi-Bing Xie
- Department of Rheumatology and Immunology, West China Hospital, Sichuan University, 37 Guoxue Xiang, Chengdu, Sichuan 610041, PR China
| | - Yi Zhao
- Department of Rheumatology and Immunology, West China Hospital, Sichuan University, 37 Guoxue Xiang, Chengdu, Sichuan 610041, PR China
| | - Yi Liu
- Department of Rheumatology and Immunology, West China Hospital, Sichuan University, 37 Guoxue Xiang, Chengdu, Sichuan 610041, PR China.
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31
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Itk is required for Th9 differentiation via TCR-mediated induction of IL-2 and IRF4. Nat Commun 2016; 7:10857. [PMID: 26936133 PMCID: PMC4782063 DOI: 10.1038/ncomms10857] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2015] [Accepted: 01/26/2016] [Indexed: 12/15/2022] Open
Abstract
Th9 cells produce interleukin (IL)-9, a cytokine implicated in allergic asthma and autoimmunity. Here we show that Itk, a mediator of T cell receptor signalling required for Th2 immune responses and the development of asthma, is a positive regulator of Th9 differentiation. In a model of allergic lung disease, Itk-deficient mice show reduced pulmonary inflammation and IL-9 production by T cells and innate lymphoid type 2 cells (ILC2), despite normal early induction of ILC2s. In vitro, Itk(-/-) CD4(+) T cells do not produce IL-9 and have reduced levels of IRF4 (Interferon Regulator Factor 4), a critical transcription factor for effector T cell function. Both IL-9 and IRF4 expression are rescued by either IL-2 or constitutively active STAT5, but not NFATc1. STAT5 binds the Irf4 promoter, demonstrating one mechanism by which IL-2 rescues weakly activated T cells. Itk inhibition also reduces IL-9 expression by human T cells, implicating ITK as a key regulator of Th9 induction.
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32
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Conley JM, Gallagher MP, Berg LJ. T Cells and Gene Regulation: The Switching On and Turning Up of Genes after T Cell Receptor Stimulation in CD8 T Cells. Front Immunol 2016; 7:76. [PMID: 26973653 PMCID: PMC4770016 DOI: 10.3389/fimmu.2016.00076] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2015] [Accepted: 02/15/2016] [Indexed: 11/25/2022] Open
Abstract
Signaling downstream of the T cell receptor (TCR) is directly regulated by the dose and affinity of peptide antigen. The strength of TCR signaling drives a multitude of T cell functions from development to differentiation. CD8 T cells differentiate into a diverse pool of effector and memory cells after activation, a process that is critical for pathogen clearance and is highly regulated by TCR signal strength. T cells rapidly alter their gene expression upon activation. Multiple signaling pathways downstream of the TCR activate transcription factors, which are critical for this process. The dynamics between proximal TCR signaling, transcription factor activation and CD8 T cell function are discussed here. We propose that inducible T cell kinase (ITK) acts as a rheostat for gene expression. This unique regulation of TCR signaling by ITK provides a possible signaling mechanism for the promotion of a diverse T cell repertoire in response to pathogen.
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Affiliation(s)
- James M Conley
- Department of Pathology, University of Massachusetts Medical School , Worcester, MA , USA
| | - Michael P Gallagher
- Department of Pathology, University of Massachusetts Medical School , Worcester, MA , USA
| | - Leslie J Berg
- Department of Pathology, University of Massachusetts Medical School , Worcester, MA , USA
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33
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Sun Y, Peng I, Webster JD, Suto E, Lesch J, Wu X, Senger K, Francis G, Barrett K, Collier JL, Burch JD, Zhou M, Chen Y, Chan C, Eastham-Anderson J, Ngu H, Li O, Staton T, Havnar C, Jaochico A, Jackman J, Jeet S, Riol-Blanco L, Wu LC, Choy DF, Arron JR, McKenzie BS, Ghilardi N, Ismaili MHA, Pei Z, DeVoss J, Austin CD, Lee WP, Zarrin AA. Inhibition of the kinase ITK in a mouse model of asthma reduces cell death and fails to inhibit the inflammatory response. Sci Signal 2015; 8:ra122. [PMID: 26628680 DOI: 10.1126/scisignal.aab0949] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Interleukin-2 (IL-2)-inducible T cell kinase (ITK) mediates T cell receptor (TCR) signaling primarily to stimulate the production of cytokines, such as IL-4, IL-5, and IL-13, from T helper 2 (TH2) cells. Compared to wild-type mice, ITK knockout mice are resistant to asthma and exhibit reduced lung inflammation and decreased amounts of TH2-type cytokines in the bronchoalveolar lavage fluid. We found that a small-molecule selective inhibitor of ITK blocked TCR-mediated signaling in cultured TH2 cells, including the tyrosine phosphorylation of phospholipase C-γ1 (PLC-γ1) and the secretion of IL-2 and TH2-type cytokines. Unexpectedly, inhibition of the kinase activity of ITK during or after antigen rechallenge in an ovalbumin-induced mouse model of asthma failed to reduce airway hyperresponsiveness and inflammation. Rather, in mice, pharmacological inhibition of ITK resulted in T cell hyperplasia and the increased production of TH2-type cytokines. Thus, our studies predict that inhibition of the kinase activity of ITK may not be therapeutic in patients with asthma.
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Affiliation(s)
- Yonglian Sun
- Department of Immunology, Genentech Inc., South San Francisco, CA 94080, USA
| | - Ivan Peng
- Department of Immunology, Genentech Inc., South San Francisco, CA 94080, USA
| | - Joshua D Webster
- Department of Pathology, Genentech Inc., South San Francisco, CA 94080, USA
| | - Eric Suto
- Department of Immunology, Genentech Inc., South San Francisco, CA 94080, USA
| | - Justin Lesch
- Department of Immunology, Genentech Inc., South San Francisco, CA 94080, USA
| | - Xiumin Wu
- Department of Immunology, Genentech Inc., South San Francisco, CA 94080, USA
| | - Kate Senger
- Department of Immunology, Genentech Inc., South San Francisco, CA 94080, USA
| | - George Francis
- Department of Biochemical and Cellular Pharmacology, Genentech Inc., South San Francisco, CA 94080, USA
| | - Kathy Barrett
- Department of Biochemical and Cellular Pharmacology, Genentech Inc., South San Francisco, CA 94080, USA
| | - Jenna L Collier
- Department of Immunology, Genentech Inc., South San Francisco, CA 94080, USA
| | - Jason D Burch
- Department of Discovery Chemistry, Genentech Inc., South San Francisco, CA 94080, USA
| | - Meijuan Zhou
- Department of Immunology, Genentech Inc., South San Francisco, CA 94080, USA
| | - Yuan Chen
- Department of Drug Metabolism and Pharmacokinetics, Genentech Inc., South San Francisco, CA 94080, USA
| | - Connie Chan
- Department of Drug Metabolism and Pharmacokinetics, Genentech Inc., South San Francisco, CA 94080, USA
| | | | - Hai Ngu
- Department of Pathology, Genentech Inc., South San Francisco, CA 94080, USA
| | - Olga Li
- Department of Biomarker Development, Genentech Inc., South San Francisco, CA 94080, USA
| | - Tracy Staton
- Department of Biomarker Development, Genentech Inc., South San Francisco, CA 94080, USA
| | - Charles Havnar
- Department of Pathology, Genentech Inc., South San Francisco, CA 94080, USA
| | - Allan Jaochico
- Department of Drug Metabolism and Pharmacokinetics, Genentech Inc., South San Francisco, CA 94080, USA
| | - Janet Jackman
- Department of Immunology, Genentech Inc., South San Francisco, CA 94080, USA
| | - Surinder Jeet
- Department of Immunology, Genentech Inc., South San Francisco, CA 94080, USA
| | - Lorena Riol-Blanco
- Department of Immunology, Genentech Inc., South San Francisco, CA 94080, USA
| | - Lawren C Wu
- Department of Immunology, Genentech Inc., South San Francisco, CA 94080, USA
| | - David F Choy
- Department of Immunology, Tissue Growth, and Repair Diagnostics Discovery, Genentech Inc., South San Francisco, CA 94080, USA
| | - Joseph R Arron
- Department of Immunology, Genentech Inc., South San Francisco, CA 94080, USA
| | - Brent S McKenzie
- Department of Immunology, Genentech Inc., South San Francisco, CA 94080, USA
| | - Nico Ghilardi
- Department of Immunology, Genentech Inc., South San Francisco, CA 94080, USA
| | | | - Zhonghua Pei
- Department of Discovery Chemistry, Genentech Inc., South San Francisco, CA 94080, USA
| | - Jason DeVoss
- Department of Immunology, Genentech Inc., South San Francisco, CA 94080, USA
| | - Cary D Austin
- Department of Pathology, Genentech Inc., South San Francisco, CA 94080, USA
| | - Wyne P Lee
- Department of Immunology, Genentech Inc., South San Francisco, CA 94080, USA
| | - Ali A Zarrin
- Department of Immunology, Genentech Inc., South San Francisco, CA 94080, USA.
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Roybal KT, Mace EM, Clark DJ, Leard AD, Herman A, Verkade P, Orange JS, Wülfing C. Modest Interference with Actin Dynamics in Primary T Cell Activation by Antigen Presenting Cells Preferentially Affects Lamellal Signaling. PLoS One 2015; 10:e0133231. [PMID: 26237588 PMCID: PMC4523178 DOI: 10.1371/journal.pone.0133231] [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: 03/04/2015] [Accepted: 06/25/2015] [Indexed: 11/22/2022] Open
Abstract
Dynamic subcellular distributions of signaling system components are critical regulators of cellular signal transduction through their control of molecular interactions. Understanding how signaling activity depends on such distributions and the cellular structures driving them is required for comprehensive insight into signal transduction. In the activation of primary murine T cells by antigen presenting cells (APC) signaling intermediates associate with various subcellular structures, prominently a transient, wide, and actin-associated lamellum extending from an interdigitated T cell:APC interface several micrometers into the T cell. While actin dynamics are well established as general regulators of cellular organization, their role in controlling signaling organization in primary T cell:APC couples and the specific cellular structures driving it is unresolved. Using modest interference with actin dynamics with a low concentration of Jasplakinolide as corroborated by costimulation blockade we show that T cell actin preferentially controls lamellal signaling localization and activity leading downstream to calcium signaling. Lamellal localization repeatedly related to efficient T cell function. This suggests that the transient lamellal actin matrix regulates T cell signaling associations that facilitate T cell activation.
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Affiliation(s)
- Kole T. Roybal
- Department of Immunology, UT Southwestern Medical Center, Dallas, Texas, United States of America
| | - Emily M. Mace
- Children's Hospital of Philadelphia Abramson Research Center, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Danielle J. Clark
- School of Cellular and Molecular Medicine, University of Bristol, Bristol, United Kingdom
| | - Alan D. Leard
- School of Biochemistry, University of Bristol, Bristol, United Kingdom
| | - Andrew Herman
- School of Cellular and Molecular Medicine, University of Bristol, Bristol, United Kingdom
| | - Paul Verkade
- School of Biochemistry, University of Bristol, Bristol, United Kingdom
| | - Jordan S. Orange
- Children's Hospital of Philadelphia Abramson Research Center, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Christoph Wülfing
- Department of Immunology, UT Southwestern Medical Center, Dallas, Texas, United States of America
- School of Cellular and Molecular Medicine, University of Bristol, Bristol, United Kingdom
- Department of Cell Biology, UT Southwestern Medical Center, Dallas, Texas, United States of America
- * E-mail:
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35
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Burch JD, Barrett K, Chen Y, DeVoss J, Eigenbrot C, Goldsmith R, Ismaili MHA, Lau K, Lin Z, Ortwine DF, Zarrin AA, McEwan PA, Barker JJ, Ellebrandt C, Kordt D, Stein DB, Wang X, Chen Y, Hu B, Xu X, Yuen PW, Zhang Y, Pei Z. Tetrahydroindazoles as Interleukin-2 Inducible T-Cell Kinase Inhibitors. Part II. Second-Generation Analogues with Enhanced Potency, Selectivity, and Pharmacodynamic Modulation in Vivo. J Med Chem 2015; 58:3806-16. [PMID: 25844760 DOI: 10.1021/jm501998m] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
The medicinal chemistry community has directed considerable efforts toward the discovery of selective inhibitors of interleukin-2 inducible T-cell kinase (ITK), given its role in T-cell signaling downstream of the T-cell receptor (TCR) and the implications of this target for inflammatory disorders such as asthma. We have previously disclosed a structure- and property-guided lead optimization effort which resulted in the discovery of a new series of tetrahydroindazole-containing selective ITK inhibitors. Herein we disclose further optimization of this series that resulted in further potency improvements, reduced off-target receptor binding liabilities, and reduced cytotoxicity. Specifically, we have identified a correlation between the basicity of solubilizing elements in the ITK inhibitors and off-target antiproliferative effects, which was exploited to reduce cytotoxicity while maintaining kinase selectivity. Optimized analogues were shown to reduce IL-2 and IL-13 production in vivo following oral or intraperitoneal dosing in mice.
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Affiliation(s)
- Jason D Burch
- †Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Kathy Barrett
- †Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Yuan Chen
- †Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Jason DeVoss
- †Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Charles Eigenbrot
- †Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Richard Goldsmith
- †Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - M Hicham A Ismaili
- †Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Kevin Lau
- †Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Zhonghua Lin
- †Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Daniel F Ortwine
- †Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Ali A Zarrin
- †Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Paul A McEwan
- ‡Evotec (U.K.) Ltd., 114 Milton Park, Abingdon, Oxfordshire OX14 4RZ, United Kingdom
| | - John J Barker
- ‡Evotec (U.K.) Ltd., 114 Milton Park, Abingdon, Oxfordshire OX14 4RZ, United Kingdom
| | - Claire Ellebrandt
- §Evotec AG, Manfred Eigen Campus, Essener Bogen 7, D-22419 Hamburg, Germany
| | - Daniel Kordt
- §Evotec AG, Manfred Eigen Campus, Essener Bogen 7, D-22419 Hamburg, Germany
| | - Daniel B Stein
- §Evotec AG, Manfred Eigen Campus, Essener Bogen 7, D-22419 Hamburg, Germany
| | - Xiaolu Wang
- §Evotec AG, Manfred Eigen Campus, Essener Bogen 7, D-22419 Hamburg, Germany
| | - Yong Chen
- ∥Pharmaron Beijing Ltd. Co., No. 6 TaiHe Road BDA, 100176 Beijing, P. R. China
| | - Baihua Hu
- ∥Pharmaron Beijing Ltd. Co., No. 6 TaiHe Road BDA, 100176 Beijing, P. R. China
| | - Xiaofeng Xu
- ∥Pharmaron Beijing Ltd. Co., No. 6 TaiHe Road BDA, 100176 Beijing, P. R. China
| | - Po-Wai Yuen
- ∥Pharmaron Beijing Ltd. Co., No. 6 TaiHe Road BDA, 100176 Beijing, P. R. China
| | - Yamin Zhang
- ∥Pharmaron Beijing Ltd. Co., No. 6 TaiHe Road BDA, 100176 Beijing, P. R. China
| | - Zhonghua Pei
- †Genentech Inc., 1 DNA Way, South San Francisco, California 94080, United States
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36
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Huang W, August A. The signaling symphony: T cell receptor tunes cytokine-mediated T cell differentiation. J Leukoc Biol 2015; 97:477-85. [PMID: 25525115 PMCID: PMC4338847 DOI: 10.1189/jlb.1ri0614-293r] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2014] [Revised: 11/03/2014] [Accepted: 11/13/2014] [Indexed: 01/07/2023] Open
Abstract
T cell development, differentiation, and maintenance are orchestrated by 2 key signaling axes: the antigen-specific TCR and cytokine-mediated signals. The TCR signals the recognition of self- and foreign antigens to control T cell homeostasis for immune tolerance and immunity, which is regulated by a variety of cytokines to determine T cell subset homeostasis and differentiation. TCR signaling can synergize with or antagonize cytokine-mediated signaling to fine tune T cell fate; however, the latter is less investigated. Murine models with attenuated TCR signaling strength have revealed that TCR signaling can function as regulatory feedback machinery for T cell homeostasis and differentiation in differential cytokine milieus, such as IL-2-mediated Treg development; IL-7-mediated, naïve CD8(+) T cell homeostasis; and IL-4-induced innate memory CD8(+) T cell development. In this review, we discuss the symphonic cross-talk between TCR and cytokine-mediated responses that differentially control T cell behavior, with a focus on the negative tuning by TCR activation on the cytokine effects.
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Affiliation(s)
- Weishan Huang
- Department of Microbiology and Immunology, Cornell University, Ithaca, New York, USA
| | - Avery August
- Department of Microbiology and Immunology, Cornell University, Ithaca, New York, USA
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37
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Zhong Y, Dong S, Strattan E, Ren L, Butchar JP, Thornton K, Mishra A, Porcu P, Bradshaw JM, Bisconte A, Owens TD, Verner E, Brameld KA, Funk JO, Hill RJ, Johnson AJ, Dubovsky JA. Targeting interleukin-2-inducible T-cell kinase (ITK) and resting lymphocyte kinase (RLK) using a novel covalent inhibitor PRN694. J Biol Chem 2015; 290:5960-78. [PMID: 25593320 DOI: 10.1074/jbc.m114.614891] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Interleukin-2-inducible T-cell kinase (ITK) and resting lymphocyte kinase (RLK or TXK) are essential mediators of intracellular signaling in both normal and neoplastic T-cells and natural killer (NK) cells. Thus, ITK and RLK inhibitors have therapeutic potential in a number of human autoimmune, inflammatory, and malignant diseases. Here we describe a novel ITK/RLK inhibitor, PRN694, which covalently binds to cysteine residues 442 of ITK and 350 of RLK and blocks kinase activity. Molecular modeling was utilized to design molecules that interact with cysteine while binding to the ATP binding site in the kinase domain. PRN694 exhibits extended target residence time on ITK and RLK and is highly selective for a subset of the TEC kinase family. In vitro cellular assays confirm that PRN694 prevents T-cell receptor- and Fc receptor-induced cellular and molecular activation, inhibits T-cell receptor-induced T-cell proliferation, and blocks proinflammatory cytokine release as well as activation of Th17 cells. Ex vivo assays demonstrate inhibitory activity against T-cell prolymphocytic leukemia cells, and in vivo assays demonstrate durable pharmacodynamic effects on ITK, which reduces an oxazolone-induced delayed type hypersensitivity reaction. These data indicate that PRN694 is a highly selective and potent covalent inhibitor of ITK and RLK, and its extended target residence time enables durable attenuation of effector cells in vitro and in vivo. The results from this study highlight potential applications of this dual inhibitor for the treatment of T-cell- or NK cell-mediated inflammatory, autoimmune, and malignant diseases.
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Affiliation(s)
- Yiming Zhong
- From the Division of Hematology, College of Medicine, Ohio State University, Columbus, Ohio 43210
| | - Shuai Dong
- the Division of Pharmaceutics and Pharmaceutical Chemistry, College of Pharmacy, Ohio State University, Columbus, Ohio 43210, and
| | - Ethan Strattan
- From the Division of Hematology, College of Medicine, Ohio State University, Columbus, Ohio 43210
| | - Li Ren
- From the Division of Hematology, College of Medicine, Ohio State University, Columbus, Ohio 43210
| | - Jonathan P Butchar
- From the Division of Hematology, College of Medicine, Ohio State University, Columbus, Ohio 43210
| | - Kelsey Thornton
- From the Division of Hematology, College of Medicine, Ohio State University, Columbus, Ohio 43210
| | - Anjali Mishra
- From the Division of Hematology, College of Medicine, Ohio State University, Columbus, Ohio 43210
| | - Pierluigi Porcu
- From the Division of Hematology, College of Medicine, Ohio State University, Columbus, Ohio 43210
| | | | | | | | - Erik Verner
- Principia Biopharma, South San Francisco, California 94080
| | - Ken A Brameld
- Principia Biopharma, South San Francisco, California 94080
| | | | - Ronald J Hill
- Principia Biopharma, South San Francisco, California 94080
| | - Amy J Johnson
- From the Division of Hematology, College of Medicine, Ohio State University, Columbus, Ohio 43210
| | - Jason A Dubovsky
- From the Division of Hematology, College of Medicine, Ohio State University, Columbus, Ohio 43210,
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38
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Dubovsky JA, Flynn R, Du J, Harrington BK, Zhong Y, Kaffenberger B, Yang C, Towns WH, Lehman A, Johnson AJ, Muthusamy N, Devine SM, Jaglowski S, Serody JS, Murphy WJ, Munn DH, Luznik L, Hill GR, Wong HK, MacDonald KKP, Maillard I, Koreth J, Elias L, Cutler C, Soiffer RJ, Antin JH, Ritz J, Panoskaltsis-Mortari A, Byrd JC, Blazar BR. Ibrutinib treatment ameliorates murine chronic graft-versus-host disease. J Clin Invest 2014; 124:4867-76. [PMID: 25271622 DOI: 10.1172/jci75328] [Citation(s) in RCA: 160] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2014] [Accepted: 08/21/2014] [Indexed: 11/17/2022] Open
Abstract
Chronic graft-versus-host disease (cGVHD) is a life-threatening impediment to allogeneic hematopoietic stem cell transplantation, and current therapies do not completely prevent and/or treat cGVHD. CD4+ T cells and B cells mediate cGVHD; therefore, targeting these populations may inhibit cGVHD pathogenesis. Ibrutinib is an FDA-approved irreversible inhibitor of Bruton's tyrosine kinase (BTK) and IL-2 inducible T cell kinase (ITK) that targets Th2 cells and B cells and produces durable remissions in B cell malignancies with minimal toxicity. Here, we evaluated whether ibrutinib could reverse established cGVHD in 2 complementary murine models, a model interrogating T cell-driven sclerodermatous cGVHD and an alloantibody-driven multiorgan system cGVHD model that induces bronchiolar obliterans (BO). In the T cell-mediated sclerodermatous cGVHD model, ibrutinib treatment delayed progression, improved survival, and ameliorated clinical and pathological manifestations. In the alloantibody-driven cGVHD model, ibrutinib treatment restored pulmonary function and reduced germinal center reactions and tissue immunoglobulin deposition. Animals lacking BTK and ITK did not develop cGVHD, indicating that these molecules are critical to cGVHD development. Furthermore, ibrutinib treatment reduced activation of T and B cells from patients with active cGVHD. Our data demonstrate that B cells and T cells drive cGVHD and suggest that ibrutinib has potential as a therapeutic agent, warranting consideration for cGVHD clinical trials.
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39
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Chylek LA, Akimov V, Dengjel J, Rigbolt KTG, Hu B, Hlavacek WS, Blagoev B. Phosphorylation site dynamics of early T-cell receptor signaling. PLoS One 2014; 9:e104240. [PMID: 25147952 PMCID: PMC4141737 DOI: 10.1371/journal.pone.0104240] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2014] [Accepted: 07/07/2014] [Indexed: 11/18/2022] Open
Abstract
In adaptive immune responses, T-cell receptor (TCR) signaling impacts multiple cellular processes and results in T-cell differentiation, proliferation, and cytokine production. Although individual protein-protein interactions and phosphorylation events have been studied extensively, we lack a systems-level understanding of how these components cooperate to control signaling dynamics, especially during the crucial first seconds of stimulation. Here, we used quantitative proteomics to characterize reshaping of the T-cell phosphoproteome in response to TCR/CD28 co-stimulation, and found that diverse dynamic patterns emerge within seconds. We detected phosphorylation dynamics as early as 5 s and observed widespread regulation of key TCR signaling proteins by 30 s. Development of a computational model pointed to the presence of novel regulatory mechanisms controlling phosphorylation of sites with central roles in TCR signaling. The model was used to generate predictions suggesting unexpected roles for the phosphatase PTPN6 (SHP-1) and shortcut recruitment of the actin regulator WAS. Predictions were validated experimentally. This integration of proteomics and modeling illustrates a novel, generalizable framework for solidifying quantitative understanding of a signaling network and for elucidating missing links.
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Affiliation(s)
- Lily A. Chylek
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico, United States of America
- Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico, United States of America
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York, United States of America
| | - Vyacheslav Akimov
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, Odense M, Denmark
| | - Jörn Dengjel
- Department of Dermatology, Medical Center; Freiburg Institute for Advanced Studies (FRIAS); BIOSS Centre for Biological Signalling Studies; ZBSA Center for Biological Systems Analysis, University of Freiburg, Freiburg, Germany
| | - Kristoffer T. G. Rigbolt
- Department of Dermatology, Medical Center; Freiburg Institute for Advanced Studies (FRIAS); BIOSS Centre for Biological Signalling Studies; ZBSA Center for Biological Systems Analysis, University of Freiburg, Freiburg, Germany
| | - Bin Hu
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico, United States of America
- Department of Biology, University of New Mexico, Albuquerque, New Mexico, United States of America
| | - William S. Hlavacek
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico, United States of America
- Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico, United States of America
- Department of Biology, University of New Mexico, Albuquerque, New Mexico, United States of America
| | - Blagoy Blagoev
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, Odense M, Denmark
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40
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Wang X, Boyken SE, Hu J, Xu X, Rimer RP, Shea MA, Shaw AS, Andreotti AH, Huang YH. Calmodulin and PI(3,4,5)P₃ cooperatively bind to the Itk pleckstrin homology domain to promote efficient calcium signaling and IL-17A production. Sci Signal 2014; 7:ra74. [PMID: 25097034 DOI: 10.1126/scisignal.2005147] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Precise regulation of the kinetics and magnitude of Ca(2+) signaling enables this signal to mediate diverse responses, such as cell migration, differentiation, vesicular trafficking, and cell death. We showed that the Ca(2+)-binding protein calmodulin (CaM) acted in a positive feedback loop to potentiate Ca(2+) signaling downstream of the Tec kinase family member Itk. Using NMR (nuclear magnetic resonance), we mapped CaM binding to two loops adjacent to the lipid-binding pocket within the Itk pleckstrin homology (PH) domain. The Itk PH domain bound synergistically to Ca(2+)/CaM and the lipid phosphatidylinositol 3,4,5-trisphosphate [PI(3,4,5)P3], such that binding to Ca(2+)/CaM enhanced the binding to PI(3,4,5)P3 and vice versa. Disruption of CaM binding attenuated Itk recruitment to the membrane and diminished release of Ca(2+) from the endoplasmic reticulum. Moreover, disruption of this feedback loop abrogated Itk-dependent production of the proinflammatory cytokine IL-17A (interleukin-17A) by CD4(+) T cells. Additionally, we found that CaM associated with PH domains from other proteins, indicating that CaM may regulate other PH domain-containing proteins.
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Affiliation(s)
- Xinxin Wang
- Department of Pathology & Immunology, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Scott E Boyken
- Department of Biochemistry, Biophysics & Molecular Biology, Iowa State University, Ames, IA 50011, USA
| | - Jiancheng Hu
- Department of Pathology & Immunology, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Xiaolu Xu
- Department of Pathology & Immunology, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Ryan P Rimer
- Department of Pathology & Immunology, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Madeline A Shea
- Department of Biochemistry, University of Iowa, Iowa City, IA 52242, USA
| | - Andrey S Shaw
- Department of Pathology & Immunology, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Amy H Andreotti
- Department of Biochemistry, Biophysics & Molecular Biology, Iowa State University, Ames, IA 50011, USA
| | - Yina H Huang
- Department of Pathology & Immunology, Washington University School of Medicine, St. Louis, MO 63110, USA. Department of Pathology, Geisel School of Medicine at Dartmouth, Lebanon, NH 03756, USA. Department of Microbiology and Immunology, Geisel School of Medicine at Dartmouth, Lebanon, NH 03756, USA.
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41
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Huang W, Jeong AR, Kannan AK, Huang L, August A. IL-2-inducible T cell kinase tunes T regulatory cell development and is required for suppressive function. THE JOURNAL OF IMMUNOLOGY 2014; 193:2267-72. [PMID: 25063868 DOI: 10.4049/jimmunol.1400968] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
IL-2-inducible T cell kinase (ITK) is a key signaling mediator downstream of TCR, mediating T cell positive selection, as well as innate T cell and CD4(+) Th2/Th17 differentiation. In this article, we show that ITK also negatively tunes IL-2-induced expansion of conventional Foxp3-expressing regulatory T cells (Tregs). In vivo, Treg abundance is inversely correlated with ITK expression, and inducible Treg development is inversely dependent on ITK kinase activity. While Treg development normally requires both hematopoietic and thymic MHC class 2 (MHC2) expression, the absence of ITK allows Treg development with MHC2 expression in either compartment, with preference for selection by thymic MHC2, suggesting a gatekeeper role for ITK in ensuring that only Tregs selected by both thymic and hematopoietic MHC2 survive selection. Although ITK suppresses Treg development and is not required for maintenance of neuropilin-1-positive natural Tregs in the periphery, it is indispensable for Treg functional suppression of naive CD4(+) T cell-induced colitis in Rag(-/-) recipients. ITK thus regulates the development and function of Tregs.
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Affiliation(s)
- Weishan Huang
- Department of Microbiology and Immunology, Cornell University, Ithaca, NY 14853
| | - Ah-Reum Jeong
- Department of Microbiology and Immunology, Cornell University, Ithaca, NY 14853; Keck School of Medicine, University of Southern California, Los Angeles, CA 90089; and
| | - Arun K Kannan
- Department of Microbiology and Immunology, Cornell University, Ithaca, NY 14853
| | - Lu Huang
- Department of Microbiology and Immunology, Cornell University, Ithaca, NY 14853; Baker Institute for Animal Health, Cornell University, Ithaca, NY 14853
| | - Avery August
- Department of Microbiology and Immunology, Cornell University, Ithaca, NY 14853;
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42
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Burch JD, Lau K, Barker JJ, Brookfield F, Chen Y, Chen Y, Eigenbrot C, Ellebrandt C, Ismaili MHA, Johnson A, Kordt D, MacKinnon CH, McEwan PA, Ortwine DF, Stein DB, Wang X, Winkler D, Yuen PW, Zhang Y, Zarrin AA, Pei Z. Property- and structure-guided discovery of a tetrahydroindazole series of interleukin-2 inducible T-cell kinase inhibitors. J Med Chem 2014; 57:5714-27. [PMID: 24918870 DOI: 10.1021/jm500550e] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Interleukin-2 inducible T-cell kinase (ITK), a member of the Tec family of tyrosine kinases, plays a major role in T-cell signaling downstream of the T-cell receptor (TCR), and considerable efforts have been directed toward discovery of ITK-selective inhibitors as potential treatments of inflammatory disorders such as asthma. Using a previously disclosed indazole series of inhibitors as a starting point, and using X-ray crystallography and solubility forecast index (SFI) as guides, we evolved a series of tetrahydroindazole inhibitors with improved potency, selectivity, and pharmaceutical properties. Highlights include identification of a selectivity pocket above the ligand plane, and identification of appropriate lipophilic substituents to occupy this space. This effort culminated in identification of a potent and selective ITK inhibitor (GNE-9822) with good ADME properties in preclinical species.
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Affiliation(s)
- Jason D Burch
- Genentech Inc. , 1 DNA Way, South San Francisco, California 94080, United States
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43
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Zhong Y, Johnson AJ, Byrd JC, Dubovsky JA. Targeting Interleukin-2-Inducible T-cell Kinase (ITK) in T-Cell Related Diseases. ACTA ACUST UNITED AC 2014; 2:1-11. [PMID: 27917390 DOI: 10.14304/surya.jpr.v2n6.1] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
IL2-inducible T-cell kinase (ITK), a member of the Tec family tyrosine kinases, is the predominant Tec kinase in T cells and natural killer (NK) cells mediating T cell receptor (TCR) and Fc receptor (Fc R) initiated signal transduction. ITK deficiency results in impaired T and NK cell functions, leading to various disorders including malignancies, inflammation, and autoimmune diseases. In this mini-review, the role of ITK in T cell signaling and the development of small molecule inhibitors of ITK for the treatment of T-cell related disorders is examined.
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Affiliation(s)
- Yiming Zhong
- Division of Hematology, Department of Internal Medicine, The Ohio State University, 320 W. 10th Avenue, Columbus, OH 43210, USA
| | - Amy J Johnson
- Division of Hematology, Department of Internal Medicine, The Ohio State University, 320 W. 10th Avenue, Columbus, OH 43210, USA
| | - John C Byrd
- Division of Hematology, Department of Internal Medicine, The Ohio State University, 320 W. 10th Avenue, Columbus, OH 43210, USA
| | - Jason A Dubovsky
- Division of Hematology, Department of Internal Medicine, The Ohio State University, 320 W. 10th Avenue, Columbus, OH 43210, USA
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44
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Abstract
Immunodeficiencies with nonfunctional T cells comprise a heterogeneous group of conditions characterized by altered function of T lymphocytes in spite of largely preserved T cell development. Some of these forms are due to hypomorphic mutations in genes causing severe combined immunodeficiency. More recently, advances in human genome sequencing have facilitated the identification of novel genetic defects that do not affect T cell development, but alter T cell function and homeostasis. Along with increased susceptibility to infections, these conditions are characterized by autoimmunity and higher risk of malignancies. The study of these diseases, and of corresponding animal models, has provided fundamental insights on the mechanisms that govern immune homeostasis.
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45
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Joseph RE, Kleino I, Wales TE, Xie Q, Fulton DB, Engen JR, Berg LJ, Andreotti AH. Activation loop dynamics determine the different catalytic efficiencies of B cell- and T cell-specific tec kinases. Sci Signal 2013; 6:ra76. [PMID: 23982207 DOI: 10.1126/scisignal.2004298] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Itk (interleukin-2-inducible T cell kinase) and Btk (Bruton's tyrosine kinase) are nonreceptor tyrosine kinases of the Tec family that signal downstream of the T cell receptor (TCR) and B cell receptor (BCR), respectively. Despite their high sequence similarity and related signaling roles, Btk is a substantially more active kinase than Itk. We showed that substitution of 6 of the 619 amino acid residues of Itk with the corresponding residues of Btk (and vice versa) was sufficient to completely switch the activities of Itk and Btk. The substitutions responsible for the swap in activity are all localized to the activation segment of the kinase domain. Nuclear magnetic resonance and hydrogen-deuterium exchange mass spectrometry analyses revealed that Itk and Btk had distinct protein dynamics in this region, which could explain the differences in catalytic efficiency between these kinases. Introducing Itk with enhanced activity into T cells led to enhanced and prolonged TCR signaling compared to that in cells with wild-type Itk. These findings imply that evolutionary pressures have led to Tec kinases having distinct enzymatic properties, depending on the cellular context. We suggest that the weaker catalytic activities of T cell-specific kinases serve to regulate cellular activation and prevent aberrant immune responses.
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Affiliation(s)
- Raji E Joseph
- Roy J Carver Department of Biochemistry, Biophysics and Molecular Biology, Iowa State University, Ames, IA 50011, USA
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46
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Ibrutinib is an irreversible molecular inhibitor of ITK driving a Th1-selective pressure in T lymphocytes. Blood 2013; 122:2539-49. [PMID: 23886836 DOI: 10.1182/blood-2013-06-507947] [Citation(s) in RCA: 651] [Impact Index Per Article: 54.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Given its critical role in T-cell signaling, interleukin-2-inducible kinase (ITK) is an appealing therapeutic target that can contribute to the pathogenesis of certain infectious, autoimmune, and neoplastic diseases. Ablation of ITK subverts Th2 immunity, thereby potentiating Th1-based immune responses. While small-molecule ITK inhibitors have been identified, none have demonstrated clinical utility. Ibrutinib is a confirmed irreversible inhibitor of Bruton tyrosine kinase (BTK) with outstanding clinical activity and tolerability in B-cell malignancies. Significant homology between BTK and ITK alongside in silico docking studies support ibrutinib as an immunomodulatory inhibitor of both ITK and BTK. Our comprehensive molecular and phenotypic analysis confirms ITK as an irreversible T-cell target of ibrutinib. Using ibrutinib clinical trial samples along with well-characterized neoplastic (chronic lymphocytic leukemia), parasitic infection (Leishmania major), and infectious disease (Listeria monocytogenes) models, we establish ibrutinib as a clinically relevant and physiologically potent ITK inhibitor with broad therapeutic utility. This trial was registered at www.clinicaltrials.gov as #NCT01105247 and #NCT01217749.
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47
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Joseph N, Reicher B, Barda-Saad M. The calcium feedback loop and T cell activation: how cytoskeleton networks control intracellular calcium flux. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2013; 1838:557-68. [PMID: 23860253 DOI: 10.1016/j.bbamem.2013.07.009] [Citation(s) in RCA: 103] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2013] [Revised: 06/30/2013] [Accepted: 07/08/2013] [Indexed: 12/31/2022]
Abstract
During T cell activation, the engagement of a T cell with an antigen-presenting cell (APC) results in rapid cytoskeletal rearrangements and a dramatic increase of intracellular calcium (Ca(2+)) concentration, downstream to T cell antigen receptor (TCR) ligation. These events facilitate the organization of an immunological synapse (IS), which supports the redistribution of receptors, signaling molecules and organelles towards the T cell-APC interface to induce downstream signaling events, ultimately supporting T cell effector functions. Thus, Ca(2+) signaling and cytoskeleton rearrangements are essential for T cell activation and T cell-dependent immune response. Rapid release of Ca(2+) from intracellular stores, e.g. the endoplasmic reticulum (ER), triggers the opening of Ca(2+) release-activated Ca(2+) (CRAC) channels, residing in the plasma membrane. These channels facilitate a sustained influx of extracellular Ca(2+) across the plasma membrane in a process termed store-operated Ca(2+) entry (SOCE). Because CRAC channels are themselves inhibited by Ca(2+) ions, additional factors are suggested to enable the sustained Ca(2+) influx required for T cell function. Among these factors, we focus here on the contribution of the actin and microtubule cytoskeleton. The TCR-mediated increase in intracellular Ca(2+) evokes a rapid cytoskeleton-dependent polarization, which involves actin cytoskeleton rearrangements and microtubule-organizing center (MTOC) reorientation. Here, we review the molecular mechanisms of Ca(2+) flux and cytoskeletal rearrangements, and further describe the way by which the cytoskeletal networks feedback to Ca(2+) signaling by controlling the spatial and temporal distribution of Ca(2+) sources and sinks, modulating TCR-dependent Ca(2+) signals, which are required for an appropriate T cell response. This article is part of a Special Issue entitled: Reciprocal influences between cell cytoskeleton and membrane channels, receptors and transporters. Guest Editor: Jean Claude Hervé.
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Affiliation(s)
- Noah Joseph
- The Mina and Everard Goodman Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan 5290002, Israel
| | - Barak Reicher
- The Mina and Everard Goodman Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan 5290002, Israel
| | - Mira Barda-Saad
- The Mina and Everard Goodman Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan 5290002, Israel.
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The zinc-binding region of IL-2 inducible T cell kinase (Itk) is required for interaction with Gα13 and activation of serum response factor. Int J Biochem Cell Biol 2013; 45:1074-82. [PMID: 23454662 DOI: 10.1016/j.biocel.2013.02.011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2012] [Revised: 02/04/2013] [Accepted: 02/18/2013] [Indexed: 11/20/2022]
Abstract
Tec family kinases play critical roles in the activation of immune cells. In particular, Itk is important for the activation of T cells via the T cell Receptor (TcR), however, molecules that cooperate with Itk to activate downstream targets remain little explored. Here we show that Itk interacts with the heterotrimeric G-protein α subunit Gα13 during TcR triggering. This interaction requires membrane localization of both partners, and is partially dependent on GDP- and GTP-bound states of Gα13. Furthermore, we find that Itk interacts with Gα13 via the zinc binding regions within its Tec homology domain. The interaction between Itk and Gα13 also results in tyrosine phosphorylation of Gα13, however this is not required for the interaction. Itk enhances Gα13 mediated activation of serum response factor (SRF) transcriptional activity dependent on its ability to interact with Gα13, but its kinase activity is not required to enhance SRF activity. These data reveal a new pathway regulated by Itk in cells, and suggest cross talk between Itk and G-protein signaling downstream of the TcR.
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49
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Berg LJ. Signaling pathways that regulate T cell development and differentiation. THE JOURNAL OF IMMUNOLOGY 2013; 189:5487-8. [PMID: 23225893 DOI: 10.4049/jimmunol.1290076] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Leslie J Berg
- Department of Pathology, University of Massachusetts Medical School, Worcester, MA 01655, USA.
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Affiliation(s)
- Jean-Damien Charrier
- Chemistry Department at Vertex Pharmaceuticals (Europe) Ltd, 86-88 Jubilee Avenue, Milton Park, Abingdon, Oxfordshire OX14 4RW, UK
| | - Ronald MA Knegtel
- Chemistry Department at Vertex Pharmaceuticals (Europe) Ltd, 86-88 Jubilee Avenue, Milton Park, Abingdon, Oxfordshire OX14 4RW, UK
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