1
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Neurath MF, Berg LJ. VAV1 as a putative therapeutic target in autoimmune and chronic inflammatory diseases. Trends Immunol 2024; 45:580-596. [PMID: 39060140 DOI: 10.1016/j.it.2024.06.004] [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: 06/07/2024] [Revised: 06/24/2024] [Accepted: 06/24/2024] [Indexed: 07/28/2024]
Abstract
The guanine nucleotide exchange factor (GEF) VAV1, a previously 'undruggable' protein integral to T/B lymphocyte antigen-receptor signaling, promotes actin polymerization, immunological synapse formation, T cell activation and differentiation, and cytokine production. With the development of novel modalities for targeting proteins, we hypothesize that interventions targeting VAV1 will have therapeutic potential in T and T/B cell-mediated autoimmune and chronic inflammatory diseases. This opinion is supported by recent CRISPR-Cas9 studies showing VAV1 as a key positive regulator of T cell receptor (TCR) activation and cytokine production in primary human CD4+ and CD8+ T cells; data demonstrating that loss/suppression of VAV1 regulates autoimmunity and inflammation; and promising preclinical data from T and T/B cell-mediated disease models of arthritis and colitis showing the effectiveness of selective VAV1 targeting via protein degradation.
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Affiliation(s)
- Markus F Neurath
- Department of Medicine, 1 & Deutsches Zentrum Immuntherapie, University of Erlangen-Nürnberg, Kussmaul Campus for Medical Research, 91054 Erlangen, Germany
| | - Leslie J Berg
- Department of Immunology & Microbiology, University of Colorado Anschutz School of Medicine, Aurora, CO 80045, USA.
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2
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Kashiwakura JI, Matsuda T. [Understanding New Regulatory Mechanism of TCR Signal Transduction]. YAKUGAKU ZASSHI 2024; 144:497-501. [PMID: 38692923 DOI: 10.1248/yakushi.23-00154-4] [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] [Indexed: 05/03/2024]
Abstract
Signal-transducing adaptor protein-2 (STAP-2) is a unique scaffold protein that regulates several immunological signaling pathways, including LIF/LIF receptor and LPS/TLR4 signals. STAP-2 is required for Fas/FasL-dependent T cell apoptosis and SDF-1α-induced T cell migration. Conversely, STAP-2 modulates integrin-mediated T cell adhesion, suggesting that STAP-2 is essential for several negative and positive T cell functions. However, whether STAP-2 is involved in T cell-antigen receptor (TCR)-mediated T cell activation is unknown. STAP-2 deficiency was recently reported to suppress TCR-mediated T cell activation by inhibiting LCK-mediated CD3ζ and ZAP-70 activation. Using STAP-2 deficient mice, it was demonstrated that STAP-2 is required for the pathogenesis of Propionibacterium acnes-induced granuloma formation and experimental autoimmune encephalomyelitis. Here, detailed functions of STAP-2 in TCR-mediated T cell activation, and how STAP-2 affects the pathogenesis of T cell-mediated inflammation and immune diseases, are reviewed.
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MESH Headings
- Animals
- Humans
- Mice
- Adaptor Proteins, Signal Transducing/physiology
- Adaptor Proteins, Signal Transducing/metabolism
- Apoptosis
- CD3 Complex
- Cell Adhesion
- Cell Movement
- Chemokine CXCL12/physiology
- Chemokine CXCL12/metabolism
- Encephalomyelitis, Autoimmune, Experimental/immunology
- Encephalomyelitis, Autoimmune, Experimental/etiology
- Inflammation/immunology
- Lymphocyte Activation
- Lymphocyte Specific Protein Tyrosine Kinase p56(lck)/physiology
- Lymphocyte Specific Protein Tyrosine Kinase p56(lck)/metabolism
- Propionibacterium acnes/physiology
- Propionibacterium acnes/immunology
- Receptors, Antigen, T-Cell/physiology
- Receptors, Antigen, T-Cell/metabolism
- Signal Transduction
- T-Lymphocytes/immunology
- ZAP-70 Protein-Tyrosine Kinase/metabolism
- ZAP-70 Protein-Tyrosine Kinase/physiology
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Affiliation(s)
- Jun-Ichi Kashiwakura
- Department of Life Science, Faculty of Pharmaceutical Sciences, Hokkaido University of Science
| | - Tadashi Matsuda
- Department of Immunology, Graduate School of Pharmaceutical Sciences, Hokkaido University
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3
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Alizadeh Z, Fazlollahi MR, Mazinani M, Badalzadeh M, Heydarlou H, Carapito R, Molitor A, de Oteyza ACG, Proietti M, Bavani MS, Shariat M, Fallahpour M, Movahedi M, Moradi L, Grimbacher B, Bahram S, Pourpak Z. Clinical, immunological and molecular findings of 8 patients with typical and atypical severe combined immunodeficiency: identification of 7 novel mutations by whole exome sequencing. Genes Immun 2023; 24:207-214. [PMID: 37516813 DOI: 10.1038/s41435-023-00215-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Revised: 07/04/2023] [Accepted: 07/11/2023] [Indexed: 07/31/2023]
Abstract
Severe combined immunodeficiency (SCID) is one of the severe inborn errors of the immune system associated with life-threatening infections. Variations in SCID phenotypes, especially atypical SCID, may cause a significant delay in diagnosis. Therefore, SCID patients need to receive an early diagnosis. Here, we describe the clinical manifestations and genetic results of four SCID and atypical SCID patients. All patients (4 males and 4 females) in early infancy presented with SCID phenotypes within 6 months of birth. The mutations include RAG2 (p.I273T,p.G44X), IL7R (p.F361WfsTer17), ADA (c.780+1G>A), JAK3 (p.Q228Ter), LIG4 (p.G428R), and LAT (p.Y207fsTer33), as well as a previously reported missense mutation in RAG1 (p.A444V). The second report of LAT deficiency in SCID patients is presented in this study. Moreover, all variants were confirmed in patients and their parents as a heterozygous state by Sanger sequencing. The results of our study expand the clinical and molecular spectrum associated with SCID and leaky SCID phenotypes and provide valuable information for the clinical management of the patients.
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Affiliation(s)
- Zahra Alizadeh
- Immunology, Asthma & Allergy Research Institute, Tehran University of Medical Sciences, Tehran, Iran
- Pediatrics Center of Excellence, Children's Medical Center, Tehran University of Medical Sciences, Tehran, Iran
| | - Mohammad Reza Fazlollahi
- Immunology, Asthma & Allergy Research Institute, Tehran University of Medical Sciences, Tehran, Iran
- Pediatrics Center of Excellence, Children's Medical Center, Tehran University of Medical Sciences, Tehran, Iran
| | - Marzieh Mazinani
- Department of Medical Biotechnology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
| | - Mohsen Badalzadeh
- Immunology, Asthma & Allergy Research Institute, Tehran University of Medical Sciences, Tehran, Iran
- Pediatrics Center of Excellence, Children's Medical Center, Tehran University of Medical Sciences, Tehran, Iran
| | - Hanieh Heydarlou
- Immunology, Asthma & Allergy Research Institute, Tehran University of Medical Sciences, Tehran, Iran
- Pediatrics Center of Excellence, Children's Medical Center, Tehran University of Medical Sciences, Tehran, Iran
| | - Raphael Carapito
- Laboratoire d'ImmunoRhumatologie Moléculaire, plateforme GENOMAX, INSERM UMR_S 1109, Faculté de Médecine, Fédération Hospitalo-Universitaire OMICARE, Fédération de Médecine Translationnelle de Strasbourg (FMTS), LabEx TRANSPLANTEX, Université de Strasbourg, Strasbourg, France
- Service d'Immunologie Biologique, Plateau Technique de Biologie, Pôle de Biologie, Nouvel Hôpital Civil, 1 place de l'Hôpital, 67091, Strasbourg, France
| | - Anne Molitor
- Laboratoire d'ImmunoRhumatologie Moléculaire, plateforme GENOMAX, INSERM UMR_S 1109, Faculté de Médecine, Fédération Hospitalo-Universitaire OMICARE, Fédération de Médecine Translationnelle de Strasbourg (FMTS), LabEx TRANSPLANTEX, Université de Strasbourg, Strasbourg, France
- Service d'Immunologie Biologique, Plateau Technique de Biologie, Pôle de Biologie, Nouvel Hôpital Civil, 1 place de l'Hôpital, 67091, Strasbourg, France
| | - Andrés Caballero Garcia de Oteyza
- Department of Rheumatology and Clinical Immunology, Hannover Medical School, Hannover, Germany
- RESIST - Cluster of Excellence 2155, Hannover Medical School, Hannover, Germany
| | - Michele Proietti
- Department of Rheumatology and Clinical Immunology, Hannover Medical School, Hannover, Germany
- RESIST - Cluster of Excellence 2155, Hannover Medical School, Hannover, Germany
- DZIF - German Center for Infection Research, Satellite Center Freiburg, Freiburg, Germany
| | - Maryam Soleimani Bavani
- Immunology, Asthma & Allergy Research Institute, Tehran University of Medical Sciences, Tehran, Iran
- Pediatrics Center of Excellence, Children's Medical Center, Tehran University of Medical Sciences, Tehran, Iran
| | - Mansoureh Shariat
- Department of Allergy and Clinical Immunology, Pediatrics Center of Excellence, Children's Medical Center, Tehran University of Medical Sciences, Tehran, Iran
| | - Morteza Fallahpour
- Department of Allergy and Clinical Immunology, Rasool-e-Akram Hospital, Iran University of Medical Sciences, Tehran, Iran
| | - Masoud Movahedi
- Department of Allergy and Clinical Immunology, Pediatrics Center of Excellence, Children's Medical Center, Tehran University of Medical Sciences, Tehran, Iran
| | - Leila Moradi
- Immunology, Asthma & Allergy Research Institute, Tehran University of Medical Sciences, Tehran, Iran
- Pediatrics Center of Excellence, Children's Medical Center, Tehran University of Medical Sciences, Tehran, Iran
| | - Bodo Grimbacher
- Department of Rheumatology and Clinical Immunology, Hannover Medical School, Hannover, Germany
- RESIST - Cluster of Excellence 2155, Hannover Medical School, Hannover, Germany
- DZIF - German Center for Infection Research, Satellite Center Freiburg, Freiburg, Germany
| | - Seiamak Bahram
- Laboratoire d'ImmunoRhumatologie Moléculaire, plateforme GENOMAX, INSERM UMR_S 1109, Faculté de Médecine, Fédération Hospitalo-Universitaire OMICARE, Fédération de Médecine Translationnelle de Strasbourg (FMTS), LabEx TRANSPLANTEX, Université de Strasbourg, Strasbourg, France.
- Service d'Immunologie Biologique, Plateau Technique de Biologie, Pôle de Biologie, Nouvel Hôpital Civil, 1 place de l'Hôpital, 67091, Strasbourg, France.
| | - Zahra Pourpak
- Immunology, Asthma & Allergy Research Institute, Tehran University of Medical Sciences, Tehran, Iran.
- Pediatrics Center of Excellence, Children's Medical Center, Tehran University of Medical Sciences, Tehran, Iran.
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4
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Barr VA, Piao J, Balagopalan L, McIntire KM, Schoenberg FP, Samelson LE. Heterogeneity of Signaling Complex Nanostructure in T Cells Activated Via the T Cell Antigen Receptor. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2023; 29:1503-1522. [PMID: 37488826 PMCID: PMC11230849 DOI: 10.1093/micmic/ozad072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2023] [Revised: 06/08/2023] [Accepted: 06/18/2023] [Indexed: 07/26/2023]
Abstract
Activation of the T cell antigen receptor (TCR) is a key step in initiating the adaptive immune response. Single-molecule localization techniques have been used to investigate the arrangement of proteins within the signaling complexes formed around activated TCRs, but a clear picture of nanoscale organization in stimulated T cells has not emerged. Here, we have improved the examination of T cell nanostructure by visualizing individual molecules of six different proteins in a single sample of activated Jurkat T cells using the multiplexed antibody-size limited direct stochastic optical reconstruction microscopy (madSTORM) technique. We formally define irregularly shaped regions of interest, compare areas where signaling complexes are concentrated with other areas, and improve the statistical analyses of the locations of molecules. We show that nanoscale organization of proteins is mainly confined to the areas with dense concentrations of TCR-based signaling complexes. However, randomly distributed molecules are also found in some areas containing concentrated signaling complexes. These results are consistent with the view that the proteins within signaling complexes are connected by numerous weak interactions, leading to flexible, dynamic, and mutable structures which produce large variations in the nanostructure found in activated T cells.
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Affiliation(s)
- Valarie A Barr
- Laboratory of Cellular & Molecular Biology, Building 37 Room 2066, 37 Convent Drive, National Cancer Institute, National Institutes of Health, Bethesda, MD, 20892-4256, USA
| | - Juan Piao
- Department of Statistics, University of California at Los Angeles, 8965 Math Sciences Building, Los Angeles, CA 90095-1554, USA
| | - Lakshmi Balagopalan
- Laboratory of Cellular & Molecular Biology, Building 37 Room 2066, 37 Convent Drive, National Cancer Institute, National Institutes of Health, Bethesda, MD, 20892-4256, USA
| | - Katherine M McIntire
- Laboratory of Cellular & Molecular Biology, Building 37 Room 2066, 37 Convent Drive, National Cancer Institute, National Institutes of Health, Bethesda, MD, 20892-4256, USA
| | - Frederic P Schoenberg
- Department of Statistics, University of California at Los Angeles, 8965 Math Sciences Building, Los Angeles, CA 90095-1554, USA
| | - Lawrence E Samelson
- Laboratory of Cellular & Molecular Biology, Building 37 Room 2066, 37 Convent Drive, National Cancer Institute, National Institutes of Health, Bethesda, MD, 20892-4256, USA
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5
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Kashiwakura JI, Oritani K, Matsuda T. The Functional Properties and Physiological Roles of Signal-Transducing Adaptor Protein-2 in the Pathogenesis of Inflammatory and Immune Disorders. Biomedicines 2022; 10:biomedicines10123079. [PMID: 36551835 PMCID: PMC9776019 DOI: 10.3390/biomedicines10123079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2022] [Revised: 11/24/2022] [Accepted: 11/26/2022] [Indexed: 12/02/2022] Open
Abstract
Adaptor molecules play a crucial role in signal transduction in immune cells. Several adaptor molecules, such as the linker for the activation of T cells (LAT) and SH2 domain-containing leukocyte protein of 76 kDa (SLP-76), are essential for T cell development and activation following T cell receptor (TCR) aggregation, suggesting that adaptor molecules are good therapeutic targets for T cell-mediated immune disorders, such as autoimmune diseases and allergies. Signal-transducing adaptor protein (STAP)-2 is a member of the STAP family of adaptor proteins. STAP-2 functions as a scaffold for various intracellular proteins, including BRK, signal transducer, and activator of transcription (STAT)3, STAT5, and myeloid differentiation primary response protein (MyD88). In T cells, STAP-2 is involved in stromal cell-derived factor (SDF)-1α-induced migration, integrin-dependent cell adhesion, and Fas-mediated apoptosis. We previously reported the critical function of STAP-2 in TCR-mediated T cell activation and T cell-mediated autoimmune diseases. Here, we review how STAP-2 affects the pathogenesis of T cell-mediated inflammation and immune diseases in order to develop novel STAP-2-targeting therapeutic strategies.
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Affiliation(s)
- Jun-ichi Kashiwakura
- Department of Life Science, Faculty of Pharmaceutical Sciences, Hokkaido University of Science, Sapporo 0068585, Hokkaido, Japan
- Correspondence: (J.-i.K.); (T.M.); Tel.: +81-11-676-8738 (J.-i.K.); +81-11-706-3243 (T.M.); Fax: +81-11-676-8666 (J.-i.K.); +81-11-706-4990 (T.M.)
| | - Kenji Oritani
- Department of Hematology, International University of Health and Welfare, Narita 2868686, Chiba, Japan
| | - Tadashi Matsuda
- Department of Immunology, Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo 0600812, Hokkaido, Japan
- Correspondence: (J.-i.K.); (T.M.); Tel.: +81-11-676-8738 (J.-i.K.); +81-11-706-3243 (T.M.); Fax: +81-11-676-8666 (J.-i.K.); +81-11-706-4990 (T.M.)
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6
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González-Mancha N, Rodríguez-Rodríguez C, Alcover A, Merida I. Sorting Nexin 27 Enables MTOC and Secretory Machinery Translocation to the Immune Synapse. Front Immunol 2022; 12:814570. [PMID: 35095913 PMCID: PMC8790036 DOI: 10.3389/fimmu.2021.814570] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2021] [Accepted: 12/20/2021] [Indexed: 11/24/2022] Open
Abstract
Sorting nexin 27 (SNX27) association to the retromer complex mediates intracellular trafficking of cargoes containing PSD95/Dlg1/ZO-1 (PDZ)-binding C-terminal sequences from endosomes to the cell surface, preventing their lysosomal degradation. Antigen recognition by T lymphocyte leads to the formation of a highly organized structure named the immune synapse (IS), which ensures cell-cell communication and sustained T cell activation. At the neuronal synapse, SNX27 recycles PDZ-binding receptors and its defective expression is associated with synaptic dysfunction and cognitive impairment. In T lymphocytes, SNX27 was found localized at recycling endosomal compartments that polarized to the IS, suggesting a function in polarized traffic to this structure. Proteomic analysis of PDZ-SNX27 interactors during IS formation identify proteins with known functions in cytoskeletal reorganization and lipid regulation, such as diacylglycerol (DAG) kinase (DGK) ζ, as well as components of the retromer and WASH complex. In this study, we investigated the consequences of SNX27 deficiency in cytoskeletal reorganization during IS formation. Our analyses demonstrate that SNX27 controls the polarization towards the cell-cell interface of the PDZ-interacting cargoes DGKζ and the retromer subunit vacuolar protein sorting protein 26, among others. SNX27 silencing abolishes the formation of a DAG gradient at the IS and prevents re-localization of the dynactin complex component dynactin-1/p150Glued, two events that correlate with impaired microtubule organizing center translocation (MTOC). SNX27 silenced cells show marked alteration in cytoskeleton organization including a failure in the organization of the microtubule network and defects in actin clearance at the IS. Reduced SNX27 expression was also found to hinder the arrangement of signaling microclusters at the IS, as well as the polarization of the secretory machinery towards the antigen presenting cells. Our results broaden the knowledge of SNX27 function in T lymphocytes by showing a function in modulating IS organization through regulated trafficking of cargoes.
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Affiliation(s)
- Natalia González-Mancha
- Department of Immunology and Oncology, Centro Nacional de Biotecnología-Consejo Superior de Investigaciones Científicas (CNB-CSIC), Madrid, Spain
| | - Cristina Rodríguez-Rodríguez
- Department of Immunology and Oncology, Centro Nacional de Biotecnología-Consejo Superior de Investigaciones Científicas (CNB-CSIC), Madrid, Spain
| | - Andrés Alcover
- Institut Pasteur, Université de Paris, Unité Biologie Cellulaire des Lymphocytes, INSERM U1224, Ligue Nationale Contre le Cancer, Équipe Labellisée Ligue-2018, Paris, France
| | - Isabel Merida
- Department of Immunology and Oncology, Centro Nacional de Biotecnología-Consejo Superior de Investigaciones Científicas (CNB-CSIC), Madrid, Spain
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7
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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: 133] [Impact Index Per Article: 44.3] [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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Zhang Y, Qin Z, Sun W, Chu F, Zhou F. Function of Protein S-Palmitoylation in Immunity and Immune-Related Diseases. Front Immunol 2021; 12:661202. [PMID: 34557182 PMCID: PMC8453015 DOI: 10.3389/fimmu.2021.661202] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2021] [Accepted: 08/23/2021] [Indexed: 02/04/2023] Open
Abstract
Protein S-palmitoylation is a covalent and reversible lipid modification that specifically targets cysteine residues within many eukaryotic proteins. In mammalian cells, the ubiquitous palmitoyltransferases (PATs) and serine hydrolases, including acyl protein thioesterases (APTs), catalyze the addition and removal of palmitate, respectively. The attachment of palmitoyl groups alters the membrane affinity of the substrate protein changing its subcellular localization, stability, and protein-protein interactions. Forty years of research has led to the understanding of the role of protein palmitoylation in significantly regulating protein function in a variety of biological processes. Recent global profiling of immune cells has identified a large body of S-palmitoylated immunity-associated proteins. Localization of many immune molecules to the cellular membrane is required for the proper activation of innate and adaptive immune signaling. Emerging evidence has unveiled the crucial roles that palmitoylation plays to immune function, especially in partitioning immune signaling proteins to the membrane as well as to lipid rafts. More importantly, aberrant PAT activity and fluctuations in palmitoylation levels are strongly correlated with human immunologic diseases, such as sensory incompetence or over-response to pathogens. Therefore, targeting palmitoylation is a novel therapeutic approach for treating human immunologic diseases. In this review, we discuss the role that palmitoylation plays in both immunity and immunologic diseases as well as the significant potential of targeting palmitoylation in disease treatment.
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9
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Salter AI, Rajan A, Kennedy JJ, Ivey RG, Shelby SA, Leung I, Templeton ML, Muhunthan V, Voillet V, Sommermeyer D, Whiteaker JR, Gottardo R, Veatch SL, Paulovich AG, Riddell SR. Comparative analysis of TCR and CAR signaling informs CAR designs with superior antigen sensitivity and in vivo function. Sci Signal 2021; 14:14/697/eabe2606. [PMID: 34429382 DOI: 10.1126/scisignal.abe2606] [Citation(s) in RCA: 64] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Chimeric antigen receptor (CAR)-modified T cell therapy is effective in treating lymphomas, leukemias, and multiple myeloma in which the tumor cells express high amounts of target antigen. However, achieving durable remission for these hematological malignancies and extending CAR T cell therapy to patients with solid tumors will require receptors that can recognize and eliminate tumor cells with a low density of target antigen. Although CARs were designed to mimic T cell receptor (TCR) signaling, TCRs are at least 100-fold more sensitive to antigen. To design a CAR with improved antigen sensitivity, we directly compared TCR and CAR signaling in primary human T cells. Global phosphoproteomic analysis revealed that key T cell signaling proteins-such as CD3δ, CD3ε, and CD3γ, which comprise a portion of the T cell co-receptor, as well as the TCR adaptor protein LAT-were either not phosphorylated or were only weakly phosphorylated by CAR stimulation. Modifying a commonplace 4-1BB/CD3ζ CAR sequence to better engage CD3ε and LAT using embedded CD3ε or GRB2 domains resulted in enhanced T cell activation in vitro in settings of a low density of antigen, and improved efficacy in in vivo models of lymphoma, leukemia, and breast cancer. These CARs represent examples of alterations in receptor design that were guided by in-depth interrogation of T cell signaling.
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Affiliation(s)
- Alexander I Salter
- Program in Immunology, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA. .,Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA
| | - Anusha Rajan
- Program in Immunology, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA.,Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA
| | - Jacob J Kennedy
- Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA
| | - Richard G Ivey
- Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA
| | - Sarah A Shelby
- Department of Biophysics, University of Michigan, Ann Arbor, MI 48109, USA
| | - Isabel Leung
- Program in Immunology, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA.,Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA
| | - Megan L Templeton
- Program in Immunology, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA.,Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA
| | - Vishaka Muhunthan
- Program in Immunology, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA.,Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA
| | - Valentin Voillet
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA.,Cape Town HVTN Immunology Laboratory, Hutchinson Centre Research Institute of South Africa, NPC (HCRISA), Cape Town 8001, South Africa
| | - Daniel Sommermeyer
- Program in Immunology, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA.,Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA
| | - Jeffrey R Whiteaker
- Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA
| | - Raphael Gottardo
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA
| | - Sarah L Veatch
- Department of Biophysics, University of Michigan, Ann Arbor, MI 48109, USA
| | - Amanda G Paulovich
- Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA
| | - Stanley R Riddell
- Program in Immunology, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA. .,Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA.,Department of Medicine, University of Washington School of Medicine, Seattle, WA 98195, USA
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10
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Kent A, Longino NV, Christians A, Davila E. Naturally Occurring Genetic Alterations in Proximal TCR Signaling and Implications for Cancer Immunotherapy. Front Immunol 2021; 12:658611. [PMID: 34012443 PMCID: PMC8126620 DOI: 10.3389/fimmu.2021.658611] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Accepted: 04/06/2021] [Indexed: 11/13/2022] Open
Abstract
T cell-based immunotherapies including genetically engineered T cells, adoptive transfer of tumor-infiltrating lymphocytes, and immune checkpoint blockade highlight the impressive anti-tumor effects of T cells. These successes have provided new hope to many cancer patients with otherwise poor prognoses. However, only a fraction of patients demonstrates durable responses to these forms of therapies and many develop significant immune-mediated toxicity. These heterogeneous clinical responses suggest that underlying nuances in T cell genetics, phenotypes, and activation states likely modulate the therapeutic impact of these approaches. To better characterize known genetic variations that may impact T cell function, we 1) review the function of early T cell receptor-specific signaling mediators, 2) offer a synopsis of known mutations and genetic alterations within the associated molecules, 3) discuss the link between these mutations and human disease and 4) review therapeutic strategies under development or in clinical testing that target each of these molecules for enhancing anti-tumor T cell activity. Finally, we discuss novel engineering approaches that could be designed based on our understanding of the function of these molecules in health and disease.
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Affiliation(s)
- Andrew Kent
- Division of Medical Oncology, Department of Medicine, University of Colorado, Aurora, CO, United States
- Human Immunology and Immunotherapy Initiative, University of Colorado, Aurora, CO, United States
- University of Colorado Comprehensive Cancer Center, Aurora, CO, United States
| | - Natalie V. Longino
- Division of Medical Oncology, Department of Medicine, University of Colorado, Aurora, CO, United States
- Human Immunology and Immunotherapy Initiative, University of Colorado, Aurora, CO, United States
- University of Colorado Comprehensive Cancer Center, Aurora, CO, United States
- Department of Medicine, University of Colorado, Aurora, CO, United States
| | - Allison Christians
- Division of Medical Oncology, Department of Medicine, University of Colorado, Aurora, CO, United States
- Human Immunology and Immunotherapy Initiative, University of Colorado, Aurora, CO, United States
- University of Colorado Comprehensive Cancer Center, Aurora, CO, United States
| | - Eduardo Davila
- Division of Medical Oncology, Department of Medicine, University of Colorado, Aurora, CO, United States
- Human Immunology and Immunotherapy Initiative, University of Colorado, Aurora, CO, United States
- University of Colorado Comprehensive Cancer Center, Aurora, CO, United States
- Department of Medicine, University of Colorado, Aurora, CO, United States
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11
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Yang X, Chatterjee V, Ma Y, Zheng E, Yuan SY. Protein Palmitoylation in Leukocyte Signaling and Function. Front Cell Dev Biol 2020; 8:600368. [PMID: 33195285 PMCID: PMC7655920 DOI: 10.3389/fcell.2020.600368] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2020] [Accepted: 09/30/2020] [Indexed: 12/12/2022] Open
Abstract
Palmitoylation is a post-translational modification (PTM) based on thioester-linkage between palmitic acid and the cysteine residue of a protein. This covalent attachment of palmitate is reversibly and dynamically regulated by two opposing sets of enzymes: palmitoyl acyltransferases containing a zinc finger aspartate-histidine-histidine-cysteine motif (PAT-DHHCs) and thioesterases. The reversible nature of palmitoylation enables fine-tuned regulation of protein conformation, stability, and ability to interact with other proteins. More importantly, the proper function of many surface receptors and signaling proteins requires palmitoylation-meditated partitioning into lipid rafts. A growing number of leukocyte proteins have been reported to undergo palmitoylation, including cytokine/chemokine receptors, adhesion molecules, pattern recognition receptors, scavenger receptors, T cell co-receptors, transmembrane adaptor proteins, and signaling effectors including the Src family of protein kinases. This review provides the latest findings of palmitoylated proteins in leukocytes and focuses on the functional impact of palmitoylation in leukocyte function related to adhesion, transmigration, chemotaxis, phagocytosis, pathogen recognition, signaling activation, cytotoxicity, and cytokine production.
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Affiliation(s)
- Xiaoyuan Yang
- Department of Molecular Pharmacology and Physiology, Morsani College of Medicine, University of South Florida, Tampa, FL, United States
| | - Victor Chatterjee
- Department of Molecular Pharmacology and Physiology, Morsani College of Medicine, University of South Florida, Tampa, FL, United States
| | - Yonggang Ma
- Department of Molecular Pharmacology and Physiology, Morsani College of Medicine, University of South Florida, Tampa, FL, United States
| | - Ethan Zheng
- Department of Molecular Pharmacology and Physiology, Morsani College of Medicine, University of South Florida, Tampa, FL, United States
| | - Sarah Y Yuan
- Department of Molecular Pharmacology and Physiology, Morsani College of Medicine, University of South Florida, Tampa, FL, United States.,Department of Surgery, Morsani College of Medicine, University of South Florida, Tampa, FL, United States
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12
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Luu TT, Wagner AK, Schmied L, Meinke S, Freund JE, Kambayashi T, Ravens I, Achour A, Bernhardt G, Chambers BJ, Höglund P, Kadri N. IL-15 and CD155 expression regulate LAT expression in murine DNAM1 + NK cells, enhancing their effectors functions. Eur J Immunol 2020; 50:494-504. [PMID: 31834938 DOI: 10.1002/eji.201948233] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2019] [Revised: 10/14/2019] [Accepted: 12/11/2019] [Indexed: 01/19/2023]
Abstract
NK cells are innate immune cells characterized by their ability to spontaneously lyse tumor and virally infected cells. We have recently demonstrated that IL-15-sufficient DC regulate NK cell effector functions in mice. Here, we established that among ITAM-proximal signaling molecules, the expression levels of the scaffold molecule Linker for Activation of T cells (LAT) and its transcription factor ELF-1 were reduced 4 days after in vivo depletion of DC. Addition of IL-15, a cytokine presented by DC to NK cells, regulates LAT expression in NK cells with a significant effect on the DNAM1+ subset compared to DNAM1- cells. We also found that LAT expression is regulated via interaction of the DNAM1 receptor with its ligand CD155 in both immature and mature NK cells, independently of NK cell education. Finally, we found that LAT expression within DNAM1+ NK cells might be responsible for enhanced calcium mobilization following the triggering of activating receptors on NK cells. Altogether, we found that LAT expression is tightly regulated in DNAM1+ NK cells, via interaction(s) with DC, which express CD155 and IL-15, resulting in rapid activation of the DNAM1+ subset during activating receptor triggering.
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Affiliation(s)
- Thuy T Luu
- Department of Medicine, Huddinge, Karolinska Institutet, Stockholm, Sweden
| | - Arnika K Wagner
- Department of Medicine, Huddinge, Karolinska Institutet, Stockholm, Sweden
| | - Laurent Schmied
- Department of Medicine, Huddinge, Karolinska Institutet, Stockholm, Sweden
| | - Stephan Meinke
- Department of Medicine, Huddinge, Karolinska Institutet, Stockholm, Sweden
| | - Jacquelyn E Freund
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Taku Kambayashi
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Inga Ravens
- Institute of Immunology, Building 11, Hannover Medical School, Hannover, Germany
| | - Adnane Achour
- Science for Life Laboratory, Department of Medicine Solna, Karolinska Institute, and Division of Infectious Diseases, Karolinska University Hospital, Solna, Stockholm, Sweden
| | - Gunter Bernhardt
- Institute of Immunology, Building 11, Hannover Medical School, Hannover, Germany
| | - Benedict J Chambers
- Center for Infectious Medicine, Department of Medicine, Huddinge, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
| | - Petter Höglund
- Department of Medicine, Huddinge, Karolinska Institutet, Stockholm, Sweden.,Clinic for Clinical Immunology and Transfusion Medicine, Karolinska University Hospital, Stockholm, Sweden
| | - Nadir Kadri
- Science for Life Laboratory, Department of Medicine Solna, Karolinska Institute, and Division of Infectious Diseases, Karolinska University Hospital, Solna, Stockholm, Sweden
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13
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Ghashghaei M, Niazi TM, Aguilar-Mahecha A, Klein KO, Greenwood CMT, Basik M, Muanza TM. Identification of a Radiosensitivity Molecular Signature Induced by Enzalutamide in Hormone-sensitive and Hormone-resistant Prostate Cancer Cells. Sci Rep 2019; 9:8838. [PMID: 31221986 PMCID: PMC6586860 DOI: 10.1038/s41598-019-44991-w] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Accepted: 05/29/2019] [Indexed: 12/15/2022] Open
Abstract
Prostate cancer (PCa) is the most common cancer amongst men. A novel androgen receptor (AR) antagonist, enzalutamide (ENZA) has recently been demonstrated to enhance the effect of radiation (XRT) by impairing the DNA damage repair process. This study aimed to identify a radiosensitive gene signature induced by ENZA in the PCa cells and to elucidate the biological pathways which influence this radiosensitivity. We treated LNCaP (AR-positive, hormone-sensitive PCa cells) and C4-2 (AR-positive, hormone-resistant PCa cells) cells with ENZA alone and in combination with androgen deprivation therapy (ADT) and XRT. Using one-way ANOVA on the gene expression profiling, we observed significantly differentially expressed (DE) genes in inflammation-and metabolism-related genes in hormone-sensitive and hormone-resistant PCa cell lines respectively. Survival analysis in both the TCGA PRAD and GSE25136 datasets suggested an association between the expression of these genes and time to recurrence. These results indicated that ENZA alone or in combination with ADT enhanced the effect of XRT through immune and inflammation-related pathways in LNCaP cells and metabolic-related pathways in C4-2 cells. Kaplan–Meier analysis and Cox proportional hazard models showed that low expression of all the candidate genes except for PTPRN2 were associated with tumor progression and recurrence in a PCa cohort.
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Affiliation(s)
- Maryam Ghashghaei
- Lady Davis Institute for Medical Research, Jewish General Hospital, Montreal, QC, Canada.,Division of Experimental Medicine, McGill University, Montreal, QC, Canada
| | - Tamim M Niazi
- Lady Davis Institute for Medical Research, Jewish General Hospital, Montreal, QC, Canada.,Department of Radiation Oncology, Jewish General Hospital, Montreal, QC, Canada
| | | | - Kathleen Oros Klein
- Lady Davis Institute for Medical Research, Jewish General Hospital, Montreal, QC, Canada
| | - Celia M T Greenwood
- Segal Cancer Center, Lady Davis Institute of Research, Jewish General Hospital, McGill University, Montreal, QC, Canada.,Department of Epidemiology, Biostatistics and Occupational Health, McGill University, Montreal, QC, Canada.,Gerald Bronfman Department of Oncology, McGill University, Montreal, QC, Canada.,Departments of Human Genetics, McGill University, Montreal, QC, Canada
| | - Mark Basik
- Department of Oncology, Jewish General Hospital, Montreal, QC, Canada.,Department of Surgery and Oncology, Jewish General Hospital, Montréal, QC, Canada
| | - Thierry M Muanza
- Lady Davis Institute for Medical Research, Jewish General Hospital, Montreal, QC, Canada. .,Division of Experimental Medicine, McGill University, Montreal, QC, Canada. .,Department of Radiation Oncology, Jewish General Hospital, Montreal, QC, Canada.
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14
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Previte DM, Piganelli JD. Reactive Oxygen Species and Their Implications on CD4 + T Cells in Type 1 Diabetes. Antioxid Redox Signal 2018; 29:1399-1414. [PMID: 28990401 DOI: 10.1089/ars.2017.7357] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Previous work has indicated that type 1 diabetes (T1D) pathology is highly driven by reactive oxygen species (ROS). One way in which ROS shape the autoimmune response demonstrated in T1D is by promoting CD4+ T cell activation and differentiation. As CD4+ T cells are a significant contributor to pancreatic β cell destruction in T1D, understanding how ROS impact their development, activation, and differentiation is critical. Recent Advances: CD4+ T cells themselves generate ROS via nicotinamide adenine dinucleotide phosphate (NADPH) oxidase expression and electron transport chain activity. Moreover, T cells can also be exposed to exogenous ROS generated by other immune cells (e.g., macrophages and dendritic cells) and β cells. Genetically modified animals and ROS inhibitors have demonstrated that ROS blockade during activation results in CD4+ T cell hyporesponsiveness and reduced diabetes incidence. Critical Issues and Future Directions: Although the majority of studies with regard to T1D and CD4+ T cells have been done to examine the influence of redox on CD4+ T cell activation, this is not the only circumstance in which a T cell can be impacted by redox. ROS and redox have also been shown to play roles in CD4+ T cell-related tolerogenic mechanisms, including thymic selection and regulatory T cell-mediated suppression. However, the effect of these mechanisms with respect to T1D pathogenesis remains elusive. Therefore, pursuing these avenues may provide valuable insight into the global role of ROS and redox in autoreactive CD4+ T cell formation and function.
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Affiliation(s)
- Dana M Previte
- Department of Surgery, Children's Hospital of Pittsburgh, University of Pittsburgh Medical Center , Pittsburgh, Pennsylvania
| | - Jon D Piganelli
- Department of Surgery, Children's Hospital of Pittsburgh, University of Pittsburgh Medical Center , Pittsburgh, Pennsylvania
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15
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Barreira M, Rodríguez-Fdez S, Bustelo XR. New insights into the Vav1 activation cycle in lymphocytes. Cell Signal 2018; 45:132-144. [PMID: 29410283 PMCID: PMC7615736 DOI: 10.1016/j.cellsig.2018.01.026] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2017] [Revised: 01/28/2018] [Accepted: 01/30/2018] [Indexed: 10/18/2022]
Abstract
Vav1 is a hematopoietic-specific Rho GDP/GTP exchange factor and signaling adaptor. Although these activities are known to be stimulated by direct Vav1 phosphorylation, little information still exists regarding the regulatory layers that influence the overall Vav1 activation cycle. Using a collection of cell models and activation-mimetic Vav1 mutants, we show here that the dephosphorylated state of Vav1 in nonstimulated T cells requires the presence of a noncatalytic, phospholipase Cγ1-Slp76-mediated inhibitory pathway. Upon T cell stimulation, Vav1 becomes rapidly phosphorylated via the engagement of Lck and, to a much lesser extent, other Src family kinases and Zap70. In this process, Lck, Zap70 and the adaptor protein Lat contribute differently to the dynamics and amplitude of the Vav1 phosphorylated pool. Consistent with a multiphosphosite activation mechanism, the optimal stimulation of Vav1 can only be recapitulated by the combination of several activation-mimetic phosphosite mutants. The analysis of these mutants has also unveiled the presence of different Vav1 signaling competent states that are influenced by phosphosites present in the N- and C-terminal domains of the protein.
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Affiliation(s)
- María Barreira
- Centro de Investigación del Cáncer, Consejo Superior de Investigaciones Científicas (CSIC), University of Salamanca, 37007 Salamanca, Spain; Instituto de Biología Molecular y Celular del Cáncer, Consejo Superior de Investigaciones Científicas (CSIC), University of Salamanca, 37007 Salamanca, Spain
| | - Sonia Rodríguez-Fdez
- Centro de Investigación del Cáncer, Consejo Superior de Investigaciones Científicas (CSIC), University of Salamanca, 37007 Salamanca, Spain; Instituto de Biología Molecular y Celular del Cáncer, Consejo Superior de Investigaciones Científicas (CSIC), University of Salamanca, 37007 Salamanca, Spain
| | - Xosé R Bustelo
- Centro de Investigación del Cáncer, Consejo Superior de Investigaciones Científicas (CSIC), University of Salamanca, 37007 Salamanca, Spain; Instituto de Biología Molecular y Celular del Cáncer, Consejo Superior de Investigaciones Científicas (CSIC), University of Salamanca, 37007 Salamanca, Spain; Centro de Investigación Biomédica en Red de Cáncer (CIBERONC), Consejo Superior de Investigaciones Científicas (CSIC), University of Salamanca, 37007 Salamanca, Spain.
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16
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Arbulo-Echevarria MM, Narbona-Sánchez I, Fernandez-Ponce CM, Vico-Barranco I, Rueda-Ygueravide MD, Dustin ML, Miazek A, Duran-Ruiz MC, García-Cózar F, Aguado E. A Stretch of Negatively Charged Amino Acids of Linker for Activation of T-Cell Adaptor Has a Dual Role in T-Cell Antigen Receptor Intracellular Signaling. Front Immunol 2018; 9:115. [PMID: 29456532 PMCID: PMC5801411 DOI: 10.3389/fimmu.2018.00115] [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: 09/20/2017] [Accepted: 01/15/2018] [Indexed: 11/13/2022] Open
Abstract
The adaptor protein linker for activation of T cells (LAT) has an essential role transducing activatory intracellular signals coming from the TCR/CD3 complex. Previous reports have shown that upon T-cell activation, LAT interacts with the tyrosine kinase Lck, leading to the inhibition of its kinase activity. LAT-Lck interaction seemed to depend on a stretch of negatively charged amino acids in LAT. Here, we have substituted this segment of LAT between amino acids 113 and 126 with a non-charged segment and expressed the mutant LAT (LAT-NIL) in J.CaM2 cells in order to analyze TCR signaling. Substitution of this segment in LAT prevented the activation-induced interaction with Lck. Moreover, cells expressing this mutant form of LAT showed a statistically significant increase of proximal intracellular signals such as phosphorylation of LAT in tyrosine residues 171 and 191, and also enhanced ZAP70 phosphorylation approaching borderline statistical significance (p = 0.051). Nevertheless, downstream signals such as Ca2+ influx or MAPK pathways were partially inhibited. Overall, our data reveal that LAT-Lck interaction constitutes a key element regulating proximal intracellular signals coming from the TCR/CD3 complex.
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Affiliation(s)
- Mikel M Arbulo-Echevarria
- Department of Biomedicine, Biotechnology and Public Health (Immunology), Core Research Facility for Health Sciences, University of Cádiz and Puerto Real University Hospital Research Unit, Cádiz, Spain
| | - Isaac Narbona-Sánchez
- Department of Biomedicine, Biotechnology and Public Health (Immunology), Core Research Facility for Health Sciences, University of Cádiz and Puerto Real University Hospital Research Unit, Cádiz, Spain
| | - Cecilia M Fernandez-Ponce
- Department of Biomedicine, Biotechnology and Public Health (Immunology), Core Research Facility for Health Sciences, University of Cádiz and Puerto Real University Hospital Research Unit, Cádiz, Spain
| | - Inmaculada Vico-Barranco
- Department of Biomedicine, Biotechnology and Public Health (Immunology), Core Research Facility for Health Sciences, University of Cádiz and Puerto Real University Hospital Research Unit, Cádiz, Spain
| | | | - Michael L Dustin
- Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, The Kennedy Institute of Rheumatology, The University of Oxford, Headington, United Kingdom
| | - Arkadiusz Miazek
- Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, Wroclaw, Poland
| | - Mª Carmen Duran-Ruiz
- Department of Biomedicine, Biotechnology and Public Health (Biochemistry), University of Cádiz, Cádiz, Spain.,Institute of Biomedical Research Cadiz (INIBICA), Cádiz, Spain
| | - Francisco García-Cózar
- Department of Biomedicine, Biotechnology and Public Health (Immunology), Core Research Facility for Health Sciences, University of Cádiz and Puerto Real University Hospital Research Unit, Cádiz, Spain.,Institute of Biomedical Research Cadiz (INIBICA), Cádiz, Spain
| | - Enrique Aguado
- Department of Biomedicine, Biotechnology and Public Health (Immunology), Core Research Facility for Health Sciences, University of Cádiz and Puerto Real University Hospital Research Unit, Cádiz, Spain.,Institute of Biomedical Research Cadiz (INIBICA), Cádiz, Spain
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17
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Wakefield DL, Holowka D, Baird B. The FcεRI Signaling Cascade and Integrin Trafficking Converge at Patterned Ligand Surfaces. Mol Biol Cell 2017; 28:mbc.E17-03-0208. [PMID: 28794269 PMCID: PMC5687038 DOI: 10.1091/mbc.e17-03-0208] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2017] [Revised: 07/18/2017] [Accepted: 07/31/2017] [Indexed: 01/10/2023] Open
Abstract
We examined the spatial targeting of early and downstream signaling mediated by the IgE receptor (FcεRI) in RBL mast cells utilizing surface-patterned 2,4 dinitrophenyl (DNP) ligands. Micron-sized features of DNP are presented as densely immobilized conjugates of bovine serum albumin (DNP-BSA) or mobile in a supported lipid bilayer (DNP-SLB). Although soluble anti-DNP IgE binds uniformly across features for both pattern types, IgE bound to FcεRI on cells shows distinctive distributions: uniform for DNP-SLB and edge-concentrated for DNP-BSA. These distributions of IgE-FcεRI propagate to the spatial recruitment of early signaling proteins, including spleen tyrosine kinase (Syk), linker for activation of T cells (LAT), and activated phospholipase C gamma 1 (PLCγ1), which all localize with engaged receptors. We found stimulated polymerization of F-actin is not required for Syk recruitment but is progressively involved in the recruitment of LAT and PLCγ1. We further found β1- and β3-integrins colocalize with IgE-FcεRI at patterned ligand surfaces as cells spread. This recruitment corresponds to directed exocytosis of recycling endosomes (REs) containing these integrins and their fibronectin ligand. Together, our results show targeting of signaling components, including integrins, to regions of clustered IgE-FcεRI in processes that depend on stimulated actin polymerization and outward trafficking of REs.
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Affiliation(s)
- Devin L Wakefield
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853
- Current address: Department of Molecular Medicine, Beckman Research Institute of the City of Hope Comprehensive Cancer Center, Duarte, California, 91010
| | - David Holowka
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853
| | - Barbara Baird
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853
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18
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Barr VA, Sherman E, Yi J, Akpan I, Rouquette-Jazdanian AK, Samelson LE. Development of nanoscale structure in LAT-based signaling complexes. J Cell Sci 2016; 129:4548-4562. [PMID: 27875277 PMCID: PMC5201021 DOI: 10.1242/jcs.194886] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2016] [Accepted: 11/04/2016] [Indexed: 12/30/2022] Open
Abstract
The adapter molecule linker for activation of T cells (LAT) plays a crucial role in forming signaling complexes induced by stimulation of the T cell receptor (TCR). These multi-molecular complexes are dynamic structures that activate highly regulated signaling pathways. Previously, we have demonstrated nanoscale structure in LAT-based complexes where the adapter SLP-76 (also known as LCP2) localizes to the periphery of LAT clusters. In this study, we show that initially LAT and SLP-76 are randomly dispersed throughout the clusters that form upon TCR engagement. The segregation of LAT and SLP-76 develops near the end of the spreading process. The local concentration of LAT also increases at the same time. Both changes require TCR activation and an intact actin cytoskeleton. These results demonstrate that the nanoscale organization of LAT-based signaling complexes is dynamic and indicates that different kinds of LAT-based complexes appear at different times during T cell activation.
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Affiliation(s)
- Valarie A Barr
- Laboratory of Cellular and Molecular Biology, CCR, NCI, NIH, Bethesda, MD 20892, USA
| | - Eilon Sherman
- Racah Institute of Physics, The Hebrew University, Jerusalem 91904, Israel
| | - Jason Yi
- Laboratory of Cellular and Molecular Biology, CCR, NCI, NIH, Bethesda, MD 20892, USA
| | - Itoro Akpan
- Laboratory of Cellular and Molecular Biology, CCR, NCI, NIH, Bethesda, MD 20892, USA
| | | | - Lawrence E Samelson
- Laboratory of Cellular and Molecular Biology, CCR, NCI, NIH, Bethesda, MD 20892, USA
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19
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Bacchelli C, Moretti FA, Carmo M, Adams S, Stanescu HC, Pearce K, Madkaikar M, Gilmour KC, Nicholas AK, Woods CG, Kleta R, Beales PL, Qasim W, Gaspar HB. Mutations in linker for activation of T cells (LAT) lead to a novel form of severe combined immunodeficiency. J Allergy Clin Immunol 2016; 139:634-642.e5. [PMID: 27522155 DOI: 10.1016/j.jaci.2016.05.036] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2016] [Revised: 05/17/2016] [Accepted: 05/25/2016] [Indexed: 10/21/2022]
Abstract
BACKGROUND Signaling through the T-cell receptor (TCR) is critical for T-cell development and function. Linker for activation of T cells (LAT) is a transmembrane adaptor signaling molecule that is part of the TCR complex and essential for T-cell development, as demonstrated by LAT-deficient mice, which show a complete lack of peripheral T cells. OBJECTIVE We describe a pedigree affected by a severe combined immunodeficiency phenotype with absent T cells and normal B-cell and natural killer cell numbers. A novel homozygous frameshift mutation in the gene encoding for LAT was identified in this kindred. METHODS Genetic, molecular, and functional analyses were used to identify and characterize the LAT defect. Clinical and immunologic analysis of patients was also performed and reported. RESULTS Homozygosity mapping was used to identify potential defective genes. Sanger sequencing of the LAT gene showed a mutation that resulted in a premature stop codon and protein truncation leading to complete loss of function and loss of expression of LAT in the affected family members. We also demonstrate loss of LAT expression and lack of TCR signaling restoration in LAT-deficient cell lines reconstituted with a synthetic LAT gene bearing this severe combined immunodeficiency mutation. CONCLUSION For the first time, the results of this study show that inherited LAT deficiency should be considered in patients with combined immunodeficiency with T-cell abnormalities.
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Affiliation(s)
- Chiara Bacchelli
- Genetics and Genomic Medicine, UCL Institute of Child Health, London, United Kingdom
| | - Federico A Moretti
- Infection, Immunity, Inflammation and Physiological Medicine, UCL Institute of Child Health, London, United Kingdom
| | - Marlene Carmo
- Infection, Immunity, Inflammation and Physiological Medicine, UCL Institute of Child Health, London, United Kingdom
| | - Stuart Adams
- Bone Marrow Transplantation, Great Ormond Street Hospital NHS Trust, London, United Kingdom
| | - Horia C Stanescu
- Centre for Nephrology, University College London Royal Free Hospital, London, United Kingdom
| | - Kerra Pearce
- Genetics and Genomic Medicine, UCL Institute of Child Health, London, United Kingdom
| | - Manisha Madkaikar
- Infection, Immunity, Inflammation and Physiological Medicine, UCL Institute of Child Health, London, United Kingdom; Department of Pediatric Immunology and Leukocyte Biology, National Institute of Immunohematology, ICMR, Mumbai, India
| | - Kimberly C Gilmour
- Infection, Immunity, Inflammation and Physiological Medicine, UCL Institute of Child Health, London, United Kingdom; Department of Clinical Immunology, Great Ormond Street Hospital NHS Trust, London, United Kingdom
| | - Adeline K Nicholas
- Department of Medical Genetics, University of Cambridge, Cambridge, United Kingdom
| | - C Geoffrey Woods
- Department of Medical Genetics, University of Cambridge, Cambridge, United Kingdom
| | - Robert Kleta
- Centre for Nephrology, University College London Royal Free Hospital, London, United Kingdom
| | - Phil L Beales
- Genetics and Genomic Medicine, UCL Institute of Child Health, London, United Kingdom
| | - Waseem Qasim
- Infection, Immunity, Inflammation and Physiological Medicine, UCL Institute of Child Health, London, United Kingdom; Department of Clinical Immunology, Great Ormond Street Hospital NHS Trust, London, United Kingdom
| | - H Bobby Gaspar
- Infection, Immunity, Inflammation and Physiological Medicine, UCL Institute of Child Health, London, United Kingdom; Department of Clinical Immunology, Great Ormond Street Hospital NHS Trust, London, United Kingdom.
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20
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Keller B, Zaidman I, Yousefi OS, Hershkovitz D, Stein J, Unger S, Schachtrup K, Sigvardsson M, Kuperman AA, Shaag A, Schamel WW, Elpeleg O, Warnatz K, Stepensky P. Early onset combined immunodeficiency and autoimmunity in patients with loss-of-function mutation in LAT. J Exp Med 2016; 213:1185-99. [PMID: 27242165 PMCID: PMC4925012 DOI: 10.1084/jem.20151110] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2015] [Accepted: 05/04/2016] [Indexed: 12/13/2022] Open
Abstract
Keller et al. describe for the first time human LAT deficiency, which causes severe immune dysregulation with autoimmunity, lymphoproliferation, and progressive immunodeficiency. The adapter protein linker for activation of T cells (LAT) is a critical signaling hub connecting T cell antigen receptor triggering to downstream T cell responses. In this study, we describe the first kindred with defective LAT signaling caused by a homozygous mutation in exon 5, leading to a premature stop codon deleting most of the cytoplasmic tail of LAT, including the critical tyrosine residues for signal propagation. The three patients presented from early childhood with combined immunodeficiency and severe autoimmune disease. Unlike in the mouse counterpart, reduced numbers of T cells were present in the patients. Despite the reported nonredundant role of LAT in Ca2+ mobilization, residual T cells were able to induce Ca2+ influx and nuclear factor (NF) κB signaling, whereas extracellular signal-regulated kinase (ERK) signaling was completely abolished. This is the first report of a LAT-related disease in humans, manifesting by a progressive combined immune deficiency with severe autoimmune disease.
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Affiliation(s)
- Baerbel Keller
- Center for Chronic Immunodeficiency (CCI), University Medical Center and University of Freiburg, 79106 Freiburg, Germany
| | - Irina Zaidman
- Department of Pediatric Hematology Oncology, Ruth Rappaport Children's Hospital, Rambam Health Care Campus, Haifa 3109601, Israel
| | - O Sascha Yousefi
- Center for Chronic Immunodeficiency (CCI), University Medical Center and University of Freiburg, 79106 Freiburg, Germany Department of Molecular Immunology, Faculty of Biology, BIOSS Centre for Biological Signalling Studies, University of Freiburg, 79104 Freiburg, Germany Spemann Graduate School of Biology and Medicine (SGBM), Albert Ludwigs University Freiburg, 79104 Freiburg, Germany
| | - Dov Hershkovitz
- Department of Pathology, Rambam Health Care Campus, Haifa 3109601, Israel
| | - Jerry Stein
- Department of Pediatric Hematology Oncology and Bone Marrow Transplantation Unit, Schneider Children's Medical Center of Israel, Petah-Tikva 49202, Israel
| | - Susanne Unger
- Center for Chronic Immunodeficiency (CCI), University Medical Center and University of Freiburg, 79106 Freiburg, Germany
| | - Kristina Schachtrup
- Center for Chronic Immunodeficiency (CCI), University Medical Center and University of Freiburg, 79106 Freiburg, Germany
| | - Mikael Sigvardsson
- Department of Clinical and Experimental Medicine, Experimental Hematopoiesis Unit, Faculty of Health Sciences, Linköping University, 581 85 Linköping, Sweden
| | - Amir A Kuperman
- Blood Coagulation Service and Pediatric Hematology Clinic, Galilee Medical Center, Nahariya 22100, Israel Faculty of Medicine in the Galilee, Bar-Ilan University, Safed 5290002, Israel
| | - Avraham Shaag
- Monique and Jacques Roboh Department of Genetic Research, Hadassah Medical Center, Hebrew University, Jerusalem 91120, Israel
| | - Wolfgang W Schamel
- Center for Chronic Immunodeficiency (CCI), University Medical Center and University of Freiburg, 79106 Freiburg, Germany Department of Molecular Immunology, Faculty of Biology, BIOSS Centre for Biological Signalling Studies, University of Freiburg, 79104 Freiburg, Germany
| | - Orly Elpeleg
- Monique and Jacques Roboh Department of Genetic Research, Hadassah Medical Center, Hebrew University, Jerusalem 91120, Israel
| | - Klaus Warnatz
- Center for Chronic Immunodeficiency (CCI), University Medical Center and University of Freiburg, 79106 Freiburg, Germany
| | - Polina Stepensky
- Monique and Jacques Roboh Department of Genetic Research, Hadassah Medical Center, Hebrew University, Jerusalem 91120, Israel Department of Pediatric Hematology-Oncology and Bone Marrow Transplantation, Hadassah Medical Center, Hebrew University, Jerusalem 91120, Israel
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21
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Balagopalan L, Kortum RL, Coussens NP, Barr VA, Samelson LE. The linker for activation of T cells (LAT) signaling hub: from signaling complexes to microclusters. J Biol Chem 2015; 290:26422-9. [PMID: 26354432 DOI: 10.1074/jbc.r115.665869] [Citation(s) in RCA: 84] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Since the cloning of the critical adapter, LAT (linker for activation of T cells), more than 15 years ago, a combination of multiple scientific approaches and techniques continues to provide valuable insights into the formation, composition, regulation, dynamics, and function of LAT-based signaling complexes. In this review, we will summarize current views on the assembly of signaling complexes nucleated by LAT. LAT forms numerous interactions with other signaling molecules, leading to cooperativity in the system. Furthermore, oligomerization of LAT by adapter complexes enhances intracellular signaling and is physiologically relevant. These results will be related to data from super-resolution microscopy studies that have revealed the smallest LAT-based signaling units and nanostructure.
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Affiliation(s)
- Lakshmi Balagopalan
- From the Laboratory of Cellular and Molecular Biology, Center for Cancer Research, NCI, National Institutes of Health, Bethesda, Maryland 20892-4256
| | - Robert L Kortum
- the Department of Pharmacology, Uniformed Services University of the Health Sciences, Bethesda, Maryland 20814, and
| | - Nathan P Coussens
- the Division of Pre-Clinical Innovation, National Center for Advancing Translational Sciences, National Institutes of Health, Rockville, Maryland 20850
| | - Valarie A Barr
- From the Laboratory of Cellular and Molecular Biology, Center for Cancer Research, NCI, National Institutes of Health, Bethesda, Maryland 20892-4256
| | - Lawrence E Samelson
- From the Laboratory of Cellular and Molecular Biology, Center for Cancer Research, NCI, National Institutes of Health, Bethesda, Maryland 20892-4256,
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22
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Abstract
The Vav family is a group of tyrosine phosphorylation-regulated signal transduction molecules hierarchically located downstream of protein tyrosine kinases. The main function of these proteins is to work as guanosine nucleotide exchange factors (GEFs) for members of the Rho GTPase family. In addition, they can exhibit a variety of catalysis-independent roles in specific signaling contexts. Vav proteins play essential signaling roles for both the development and/or effector functions of a large variety of cell lineages, including those belonging to the immune, nervous, and cardiovascular systems. They also contribute to pathological states such as cancer, immune-related dysfunctions, and atherosclerosis. Here, I will provide an integrated view about the evolution, regulation, and effector properties of these signaling molecules. In addition, I will discuss the pros and cons for their potential consideration as therapeutic targets.
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Key Words
- Ac, acidic
- Ahr, aryl hydrocarbon receptor
- CH, calponin homology
- CSH3, most C-terminal SH3 domain of Vav proteins
- DAG, diacylglycerol
- DH, Dbl-homology domain
- Dbl-homology
- GDP/GTP exchange factors
- GEF, guanosine nucleotide exchange factor
- HIV, human immunodeficiency virus
- IP3, inositoltriphosphate
- NFAT, nuclear factor of activated T-cells
- NSH3, most N-terminal SH3 domain of Vav proteins
- PH, plekstrin-homology domain
- PI3K, phosphatidylinositol-3 kinase
- PIP3, phosphatidylinositol (3,4,5)-triphosphate
- PKC, protein kinase C
- PKD, protein kinase D
- PLC-g, phospholipase C-g
- PRR, proline-rich region
- PTK, protein tyrosine kinase
- Phox, phagocyte oxidase
- Rho GTPases
- SH2, Src homology 2
- SH3, Src homology 3
- SNP, single nucleotide polymorphism
- TCR, T-cell receptor
- Vav
- ZF, zinc finger region
- cGMP, cyclic guanosine monophosphate
- cancer
- cardiovascular biology
- disease
- immunology
- nervous system
- signaling
- therapies
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Affiliation(s)
- Xosé R Bustelo
- a Centro de Investigación del Cáncer and Instituto de Biología Molecular y Celular del Cáncer ; Consejo Superior de Investigaciones Científicas (CSIC) and University of Salamanca ; Campus Unamuno; Salamanca , Spain
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23
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O'Brien SA, Zhu M, Zhang W. The Importance of IL-6 in the Development of LAT-Mediated Autoimmunity. THE JOURNAL OF IMMUNOLOGY 2015; 195:695-705. [PMID: 26034173 DOI: 10.4049/jimmunol.1403187] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2014] [Accepted: 05/12/2015] [Indexed: 01/19/2023]
Abstract
Linker for activation of T cells (LAT) is a transmembrane adaptor protein that is highly tyrosine phosphorylated upon engagement of the TCR. Phosphorylated LAT binds Grb2, Gads, and phospholipase C (PLC)γ1 to mediate T cell activation, proliferation, and cytokine production. T cells from mice harboring a mutation at the PLCγ1 binding site of LAT (Y136F) have impaired calcium flux and Erk activation. Interestingly, these T cells are highly activated, resulting in the development of a lymphoproliferative syndrome in these mice. CD4(+) T cells in LATY136F mice are Th2 skewed, producing large amounts of IL-4. In this study, we showed that the LATY136F T cells could also overproduce IL-6 due to activated NF-κB, AKT, and p38 pathways. By crossing LATY136F mice with IL-6-deficient mice, we demonstrated that IL-6 is required for uncontrolled T cell expansion during the early stage of disease development. Reduced CD4(+) T cell expansion was not due to a further block in thymocyte development or an increase in the number of regulatory T cells, but was caused by reduction in cell survival. In aged IL-6(-/-) LATY136F mice, CD4(+) T cells began to hyperproliferate and induced splenomegaly; however, isotype switching and autoantibody production were diminished. Our data indicated that the LAT-PLCγ1 interaction is important for controlling IL-6 production by T cells and demonstrated a critical role of IL-6 in the development of this lymphoproliferative syndrome.
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Affiliation(s)
- Sarah A O'Brien
- Department of Immunology, Duke University Medical Center, Durham, NC 27710
| | - Minghua Zhu
- Department of Immunology, Duke University Medical Center, Durham, NC 27710
| | - Weiguo Zhang
- Department of Immunology, Duke University Medical Center, Durham, NC 27710
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24
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Bilal MY, Zhang EY, Dinkel B, Hardy D, Yankee TM, Houtman JCD. GADS is required for TCR-mediated calcium influx and cytokine release, but not cellular adhesion, in human T cells. Cell Signal 2015; 27:841-50. [PMID: 25636200 DOI: 10.1016/j.cellsig.2015.01.012] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2014] [Revised: 01/07/2015] [Accepted: 01/21/2015] [Indexed: 11/16/2022]
Abstract
GRB2 related adaptor protein downstream of Shc (GADS) is a member of the GRB2 family of adaptors and is critical for TCR-induced signaling. The current model is that GADS recruits SLP-76 to the LAT complex, which facilitates the phosphorylation of SLP-76, the activation of PLC-γ1, T cell adhesion and cytokine production. However, this model is largely based on studies of disruption of the GADS/SLP-76 interaction and murine T cell differentiation in GADS deficient mice. The role of GADS in mediating TCR-induced signals in human CD4+ T cells has not been thoroughly investigated. In this study, we have suppressed the expression of GADS in human CD4+ HuT78 T cells. GADS deficient HuT78 T cells displayed similar levels of TCR-induced SLP-76 and PLC-γ1 phosphorylation but exhibited substantial decrease in TCR-induced IL-2 and IFN-γ release. The defect in cytokine production occurred because of impaired calcium mobilization due to reduced recruitment of SLP-76 and PLC-γ1 to the LAT complex. Surprisingly, both GADS deficient HuT78 and GADS deficient primary murine CD8+ T cells had similar TCR-induced adhesion when compared to control T cells. Overall, our results show that GADS is required for calcium influx and cytokine production, but not cellular adhesion, in human CD4+ T cells, suggesting that the current model for T cell regulation by GADS is incomplete.
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Affiliation(s)
- Mahmood Y Bilal
- Interdisciplinary Graduate Program in Immunology, University of Iowa, Iowa City, IA 52242, United States
| | - Elizabeth Y Zhang
- Department of Microbiology, Molecular Genetics and Immunology, University of Kansas Medical Center, Kansas City, KS 66160, United States
| | - Brittney Dinkel
- Department of Microbiology, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, United States
| | - Daimon Hardy
- Department of Microbiology, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, United States
| | - Thomas M Yankee
- Department of Microbiology, Molecular Genetics and Immunology, University of Kansas Medical Center, Kansas City, KS 66160, United States
| | - Jon C D Houtman
- Interdisciplinary Graduate Program in Immunology, University of Iowa, Iowa City, IA 52242, United States; Department of Microbiology, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, United States
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25
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Multivalent presentation of the cell-penetrating peptide nona-arginine on a linear scaffold strongly increases its membrane-perturbing capacity. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2014; 1838:3097-106. [DOI: 10.1016/j.bbamem.2014.08.001] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2014] [Revised: 07/23/2014] [Accepted: 08/01/2014] [Indexed: 01/12/2023]
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26
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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: 5.1] [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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27
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Fried S, Reicher B, Pauker MH, Eliyahu S, Matalon O, Noy E, Chill J, Barda-Saad M. Triple-color FRET analysis reveals conformational changes in the WIP-WASp actin-regulating complex. Sci Signal 2014; 7:ra60. [PMID: 24962707 DOI: 10.1126/scisignal.2005198] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Wiskott-Aldrich syndrome protein (WASp) is a key regulator of the actin cytoskeletal machinery. Binding of WASp-interacting protein (WIP) to WASp modulates WASp activity and protects it from degradation. Formation of the WIP-WASp complex is crucial for the adaptive immune response. We found that WIP and WASp interacted in cells through two distinct molecular interfaces. One interaction occurred between the WASp-homology-1 (WH1) domain of WASp and the carboxyl-terminal domain of WIP that depended on the phosphorylation status of WIP, which is phosphorylated by protein kinase C θ (PKCθ) in response to T cell receptor activation. The other interaction occurred between the verprolin homology, central hydrophobic region, and acidic region (VCA) domain of WASp and the amino-terminal domain of WIP. This latter interaction required actin, because it was inhibited by latrunculin A, which sequesters actin monomers. With triple-color fluorescence resonance energy transfer (3FRET) technology, we demonstrated that the WASp activation mechanism involved dissociation of the first interaction, while leaving the second interaction intact. This conformation exposed the ubiquitylation site on WASp, leading to degradation of WASp. Together, these data suggest that the activation and degradation of WASp are delicately balanced and depend on the phosphorylation state of WIP. Our molecular analysis of the WIP-WASp interaction provides insight into the regulation of actin-dependent processes.
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Affiliation(s)
- Sophia Fried
- 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
| | - Maor H Pauker
- The Mina and Everard Goodman Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan 5290002, Israel
| | - Shani Eliyahu
- The Mina and Everard Goodman Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan 5290002, Israel
| | - Omri Matalon
- The Mina and Everard Goodman Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan 5290002, Israel
| | - Elad Noy
- The Mina and Everard Goodman Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan 5290002, Israel
| | - Jordan Chill
- Department of Chemistry, Faculty of Exact 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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28
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Abstract
Caspase recruitment domain-containing membrane-associated guanylate kinase protein-1 (CARMA1), a member of the membrane associated guanylate kinase (MAGUK) family of kinases, is essential for T lymphocyte activation and proliferation via T-cell receptor (TCR) mediated NF-κB activation. Recent studies suggest a broader role for CARMA1 regulating other T-cell functions as well as a role in non-TCR-mediated signaling pathways important for lymphocyte development and functions. In addition, CARMA1 has been shown to be an important component in the pathogenesis of several human diseases. Thus, comprehensively defining its mechanisms of action and regulation could reveal novel therapeutic targets for T-cell-mediated diseases and lymphoproliferative disorders.
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Affiliation(s)
- Marly I Roche
- Pulmonary and Critical Care Unit and the Center for Immunology and Inflammatory Diseases, Massachusetts General Hospital and Harvard Medical School, Boston, MA 02114, USA
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29
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Palmitoylated transmembrane adaptor proteins in leukocyte signaling. Cell Signal 2014; 26:895-902. [PMID: 24440308 DOI: 10.1016/j.cellsig.2014.01.007] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2013] [Revised: 01/07/2014] [Accepted: 01/09/2014] [Indexed: 12/14/2022]
Abstract
Transmembrane adaptor proteins (TRAPs) are structurally related proteins that have no enzymatic function, but enable inducible recruitment of effector molecules to the plasma membrane, usually in a phosphorylation dependent manner. Numerous surface receptors employ TRAPs for either propagation or negative regulation of the signal transduction. Several TRAPs (LAT, NTAL, PAG, LIME, PRR7, SCIMP, LST1/A, and putatively GAPT) are known to be palmitoylated that could facilitate their localization in lipid rafts or tetraspanin enriched microdomains. This review summarizes expression patterns, binding partners, signaling pathways, and biological functions of particular palmitoylated TRAPs with an emphasis on the three most recently discovered members, PRR7, SCIMP, and LST1/A. Moreover, we discuss in silico methodology used for discovery of new family members, nature of their binding partners, and microdomain localization.
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30
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Tomar N, De RK. A model of an integrated immune system pathway in Homo sapiens and its interaction with superantigen producing expression regulatory pathway in Staphylococcus aureus: comparing behavior of pathogen perturbed and unperturbed pathway. PLoS One 2013; 8:e80918. [PMID: 24324645 PMCID: PMC3855681 DOI: 10.1371/journal.pone.0080918] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2013] [Accepted: 10/17/2013] [Indexed: 11/19/2022] Open
Abstract
Response of an immune system to a pathogen attack depends on the balance between the host immune defense and the virulence of the pathogen. Investigation of molecular interactions between the proteins of a host and a pathogen helps in identifying the pathogenic proteins. It is necessary to understand the dynamics of a normally behaved host system to evaluate the capacity of its immune system upon pathogen attack. In this study, we have compared the behavior of an unperturbed and pathogen perturbed host system. Moreover, we have developed a formalism under Flux Balance Analysis (FBA) for the optimization of conflicting objective functions. We have constructed an integrated pathway system, which includes Staphylococcal Superantigen (SAg) expression regulatory pathway and TCR signaling pathway of Homo sapiens. We have implemented the method on this pathway system and observed the behavior of host signaling molecules upon pathogen attack. The entire study has been divided into six different cases, based on the perturbed/unperturbed conditions. In other words, we have investigated unperturbed and pathogen perturbed human TCR signaling pathway, with different combinations of optimization of concentrations of regulatory and signaling molecules. One of these cases has aimed at finding out whether minimization of the toxin production in a pathogen leads to the change in the concentration levels of the proteins coded by TCR signaling pathway genes in the infected host. Based on the computed results, we have hypothesized that the balance between TCR signaling inhibitory and stimulatory molecules can keep TCR signaling system into resting/stimulating state, depending upon the perturbation. The proposed integrated host-pathogen interaction pathway model has accurately reflected the experimental evidences, which we have used for validation purpose. The significance of this kind of investigation lies in revealing the susceptible interaction points that can take back the Staphylococcal Enterotoxin (SE)-challenged system within the range of normal behavior.
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Affiliation(s)
- Namrata Tomar
- Machine Intelligence Unit, Indian Statistical Institute, Kolkata, India
| | - Rajat K. De
- Machine Intelligence Unit, Indian Statistical Institute, Kolkata, India
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31
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Salek M, McGowan S, Trudgian DC, Dushek O, de Wet B, Efstathiou G, Acuto O. Quantitative phosphoproteome analysis unveils LAT as a modulator of CD3ζ and ZAP-70 tyrosine phosphorylation. PLoS One 2013; 8:e77423. [PMID: 24204825 PMCID: PMC3813684 DOI: 10.1371/journal.pone.0077423] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2013] [Accepted: 09/10/2013] [Indexed: 11/25/2022] Open
Abstract
Signaling through the T cell receptor (TCR) initiates adaptive immunity and its perturbation may results in autoimmunity. The plasma membrane scaffolding protein LAT acts as a central organizer of the TCR signaling machinery to activate many functional pathways. LAT-deficient mice develop an autoimmune syndrome but the mechanism of this pathology is unknown. In this work we have compared global dynamics of TCR signaling by MS-based quantitative phosphoproteomics in LAT-sufficient and LAT-defective Jurkat T cells. Surprisingly, we found that many TCR-induced phosphorylation events persist in the absence of LAT, despite ERK and PLCγ1 phosphorylation being repressed. Most importantly, the absence of LAT resulted in augmented and persistent tyrosine phosphorylation of CD3ζ and ZAP70. This indicates that LAT signaling hub is also implicated in negative feedback signals to modulate upstream phosphorylation events. Phosphorylation kinetics data resulting from this investigation is documented in a database (phosphoTCR) accessible online. The MS data have been deposited to the ProteomeXchange with identifier PXD000341.
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Affiliation(s)
- Mogjiborahman Salek
- T cell Signaling Laboratory, Sir William Dunn School of Pathology, University of Oxford, Oxford, United Kingdom
- * E-mail: (OA); (MS)
| | - Simon McGowan
- Computational Biology Research Group, Nuffield Department of Medicine, University of Oxford, Headington, Oxford, United Kingdom
| | - David C. Trudgian
- Central Proteomics Facility, Sir William Dunn School of Pathology, University of Oxford, Oxford, United Kingdom
| | - Omer Dushek
- Molecular Immunology Group, Sir William Dunn School of Pathology, University of Oxford, Oxford, United Kingdom
| | - Ben de Wet
- T cell Signaling Laboratory, Sir William Dunn School of Pathology, University of Oxford, Oxford, United Kingdom
- Central Proteomics Facility, Sir William Dunn School of Pathology, University of Oxford, Oxford, United Kingdom
| | - Georgios Efstathiou
- T cell Signaling Laboratory, Sir William Dunn School of Pathology, University of Oxford, Oxford, United Kingdom
| | - Oreste Acuto
- T cell Signaling Laboratory, Sir William Dunn School of Pathology, University of Oxford, Oxford, United Kingdom
- * E-mail: (OA); (MS)
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32
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Abstract
The covalent attachment of palmitate to proteins can alter protein-lipid and protein-protein interactions thereby influencing protein function. Palmitoylation is a reversible post-translational modification. Thus, like protein phosphorylation, protein palmitoylation can function in activation-dependent signaling pathways. This review will provide an overview of the mechanisms and regulation of protein palmitoylation and focus on the role of palmitoylation in signal transduction pathways of lymphocytes and platelets.
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Affiliation(s)
- Robert Flaumenhaft
- Beth Israel Deaconess Medical Center, Harvard Medical School, Division of Hemostasis and Thrombosis, Department of Medicine, Boston, MA, 02215, USA.
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33
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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: 97] [Impact Index Per Article: 8.8] [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 membrane adaptor LAT is proteolytically cleaved following Fas engagement in a tyrosine phosphorylation-dependent fashion. Biochem J 2013; 450:511-21. [PMID: 23240581 DOI: 10.1042/bj20121135] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Engagement of the TCR (T-cell receptor) induces tyrosine phosphorylation of the LAT (linker for the activation of T-cells) adaptor, and thereby it recruits several cytosolic mediators for downstream signalling pathways. The Fas protein is essential for T-lymphocyte apoptosis, and following Fas engagement, many proteins are proteolytically cleaved, including several molecules that are important for the transduction of TCR intracellular signals. In the present study, we demonstrate that the adaptor LAT is also subject to a proteolytic cleavage in mature T-lymphocytes and thymocytes in response to Fas engagement, and also on TCR stimulation, and we identify three aspartic acid residues at which LAT is cleaved. Interestingly, these aspartic acid residues are located in proximity to several functionally important tyrosine residues of LAT, raising the possibility that their phosphorylation could modulate LAT cleavage. Consistent with that hypothesis, we show that induction of phosphorylation by pervanadate or H2O2 in Jurkat cells and thymocytes inhibits Fas-mediated cleavage of LAT. Moreover, we show that LAT proteolysis is also enhanced during anergy induction of primary human T-cells, suggesting that LAT cleavage may act as a regulator of TCR-mediated activation of T-cells and not only as a transducer of cell death promoting stimuli.
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35
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Rossy J, Williamson DJ, Benzing C, Gaus K. The integration of signaling and the spatial organization of the T cell synapse. Front Immunol 2012. [PMID: 23189081 PMCID: PMC3504718 DOI: 10.3389/fimmu.2012.00352] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Engagement of the T cell antigen receptor (TCR) triggers signaling pathways that lead to T cell selection, differentiation and clonal expansion. Superimposed onto the biochemical network is a spatial organization that describes individual receptor molecules, dimers, oligomers and higher order structures. Here we discuss recent findings and new concepts that may regulate TCR organization in naïve and memory T cells. A key question that has emerged is how antigen-TCR interactions encode spatial information to direct T cell activation and differentiation. Single molecule super-resolution microscopy may become an important tool in decoding receptor organization at the molecular level.
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Affiliation(s)
- Jérémie Rossy
- Centre for Vascular Research and Australian Centre for Nanomedicine, University of New South Wales Sydney, NSW, Australia
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36
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Fu G, Chen Y, Schuman J, Wang D, Wen R. Phospholipase Cγ2 plays a role in TCR signal transduction and T cell selection. THE JOURNAL OF IMMUNOLOGY 2012; 189:2326-32. [PMID: 22837484 DOI: 10.4049/jimmunol.1103458] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
One of the important signaling events following TCR engagement is activation of phospholipase Cγ (PLCγ). PLCγ has two isoforms, PLCγ1 and PLCγ2. It is known that PLCγ1 is important for TCR signaling and TCR-mediated T cell selection and functions, whereas PLCγ2 is critical for BCR signal transduction and BCR-mediated B cell maturation and functions. In this study, we report that PLCγ2 was expressed in primary T cells, and became associated with linker for activated T cells and Src homology 2-domain containing leukocyte protein of 76 kDa and activated upon TCR stimulation. PLCγ1/PLCγ2 double-deficient T cells displayed further block from CD4 and CD8 double-positive to single-positive transition compared with PLCγ1 single-deficient T cells. TCR-mediated proliferation was further impaired in PLCγ1/PLCγ2 double-deficient T cells compared with PLCγ1 single-deficient T cells. TCR-mediated signal transduction, including Ca²⁺ mobilization and Erk activation, was further impaired in PLCγ1/PLCγ2 double-deficient relative to PLCγ1 single-deficient T cells. In addition, in HY TCR transgenic mouse model, thymic positive and negative selections were reduced in PLCγ1 heterozygous- and PLCγ2 homozygous-deficient (PLCγ1⁺/⁻PLCγ2⁻/⁻) relative to wild-type, PLCγ2 single-deficient (PLCγ2⁻/⁻), or PLCγ1 heterozygous-deficient (PLCγ1⁺/⁻) mice. Taken together, these data demonstrate that PLCγ2 participates in TCR signal transduction and plays a role in T cell selection.
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Affiliation(s)
- Guoping Fu
- Blood Research Institute, BloodCenter of Wisconsin, Milwaukee, WI 53226, USA
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37
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Abstract
Linker for activation of T cells (LAT) is a transmembrane adaptor protein that is essential to bridge T cell receptor (TCR) engagement to downstream signaling events. The indispensable role of LAT in thymocyte development and T cell activation has been well characterized; however, the function of LAT in cytotoxic-T-lymphocyte (CTL) cytotoxicity remains unknown. We show here that LAT-deficient CTLs failed to upregulate FasL and produce gamma interferon after engagement with target cells and had impaired granule-mediated killing. We further dissected the effect of the LAT deletion on each step of granule exocytosis. LAT deficiency led to altered synapse formation, subsequently causing unstable T cell-antigen-presenting cell (APC) conjugates. Microtubule organizing center polarization and granule reorientation were also impaired by LAT deficiency, leading to reduced granule delivery. Despite these defects, granule release was still observed in LAT-deficient CTLs due to residual calcium flux and phospholipase C (PLC) activity. Our data demonstrated that LAT-mediated signaling intricately regulates CTL cytotoxicity at multiple steps.
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38
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Linker for activation of T cells is displaced from lipid rafts and decreases in lupus T cells after activation via the TCR/CD3 pathway. Clin Immunol 2011; 142:243-51. [PMID: 22285373 DOI: 10.1016/j.clim.2011.12.010] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2011] [Revised: 12/19/2011] [Accepted: 12/20/2011] [Indexed: 11/23/2022]
Abstract
Systemic lupus erythematosus (SLE) is characterized by abnormal signal transduction mechanisms in T lymphocytes. Linker for activation of T cells (LAT) couples TCR/CD3 activation with downstream signaling pathways. We reported diminished ERK 1/2 kinase activity in TCR/CD3 stimulated lupus T cells. In this study we evaluated the expression, phosphorylation, lipid raft and immunological synapse (IS) localization and colocalization of LAT with key signalosome molecules. We observed a diminished expression and an abnormal localization of LAT in lipid rafts and at the IS in activated lupus T cells. LAT phosphorylation, capture by GST-Grb2 fusion protein, and coupling to Grb2 and PLCγ1, was similar in healthy control and lupus T cells. Our results suggest that an abnormal localization of LAT within lipid rafts and its accelerated degradation after TCR/CD3 activation may compromise the assembly of the LAT signalosome and downstream signaling pathways required for full MAPK activation in lupus T cells.
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39
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Fuller DM, Zhu M, Ou-Yang CW, Sullivan SA, Zhang W. A tale of two TRAPs: LAT and LAB in the regulation of lymphocyte development, activation, and autoimmunity. Immunol Res 2011; 49:97-108. [PMID: 21136199 DOI: 10.1007/s12026-010-8197-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Transmembrane adaptor proteins (TRAPs) link antigen receptor engagement to downstream cellular processes. Although these proteins typically lack intrinsic enzymatic activity, they are phosphorylated on multiple tyrosine residues following lymphocyte activation, allowing them to function as scaffolds for the assembly of multi-molecular signaling complexes. Among the many TRAPs that have been discovered in recent years, the LAT (linker for activation of T cells) family of adaptor proteins plays an important role in the positive and negative regulation of lymphocyte maturation, activation, and differentiation. Of the two members in this family, LAT is an indispensable component controlling T cell and mast cell activation and function; LAB (linker for activation of B cells), also called NTAL, is necessary to fine-tune lymphocyte activation and may be a key regulator of innate immune responses. Here, we review recent advances on the function of LAT and LAB in the regulation of development and activation of immune cells.
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Affiliation(s)
- Deirdre M Fuller
- Department of Immunology, Duke University Medical Center, Durham, NC 27710, USA
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40
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Kremer KN, Clift IC, Miamen AG, Bamidele AO, Qian NX, Humphreys TD, Hedin KE. Stromal cell-derived factor-1 signaling via the CXCR4-TCR heterodimer requires phospholipase C-β3 and phospholipase C-γ1 for distinct cellular responses. THE JOURNAL OF IMMUNOLOGY 2011; 187:1440-7. [PMID: 21705626 DOI: 10.4049/jimmunol.1100820] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The CXCR4 chemokine receptor is a G protein-coupled receptor that signals in T lymphocytes by forming a heterodimer with the TCR. CXCR4 and TCR functions are consequently highly cross regulated, affecting T cell immune activation, cytokine secretion, and T cell migration. The CXCR4-TCR heterodimer stimulates T cell migration and activation of the ERK MAPK and downstream AP-1-dependent cytokine transcription in response to stromal cell-derived factor-1 (SDF-1), the sole chemokine ligand of CXCR4. These responses require Gi-type G proteins as well as TCR ITAM domains and the ZAP70 tyrosine kinase, thus indicating that the CXCR4-TCR heterodimer signals to integrate G protein-coupled receptor-associated and TCR-associated signaling molecules in response to SDF-1. Yet, the phospholipase C (PLC) isozymes responsible for coupling the CXCR4-TCR heterodimer to distinct downstream cellular responses are incompletely characterized. In this study, we demonstrate that PLC activity is required for SDF-1 to induce ERK activation, migration, and CXCR4 endocytosis in human T cells. SDF-1 signaling via the CXCR4-TCR heterodimer uses PLC-β3 to activate the Ras-ERK pathway and increase intracellular calcium ion concentrations, whereas PLC-γ1 is dispensable for these outcomes. In contrast, PLC-γ1, but not PLC-β3, is required for SDF-1-mediated migration via a mechanism independent of LAT. These results increase understanding of the signaling mechanisms employed by the CXCR4-TCR heterodimer, characterize new roles for PLC-β3 and PLC-γ1 in T cells, and suggest that multiple PLCs may also be activated downstream of other chemokine receptors to distinctly regulate migration versus other signaling functions.
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Affiliation(s)
- Kimberly N Kremer
- Department of Immunology, Mayo Clinic College of Medicine, Mayo Clinic, Rochester, MN 55905, USA
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41
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Pre-existing clusters of the adaptor Lat do not participate in early T cell signaling events. Nat Immunol 2011; 12:655-62. [PMID: 21642986 DOI: 10.1038/ni.2049] [Citation(s) in RCA: 248] [Impact Index Per Article: 19.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2011] [Accepted: 05/05/2011] [Indexed: 01/21/2023]
Abstract
Engaged T cell antigen receptors (TCRs) initiate signaling through the adaptor protein Lat. In quiescent T cells, Lat is segregated into clusters on the cell surface, which raises the question of how TCR triggering initiates signaling. Using super-resolution fluorescence microscopy, we found that pre-existing Lat domains were neither phosphorylated nor laterally transported to TCR activation sites, which suggested that these clusters do not participate in TCR signaling. Instead, TCR activation resulted in the recruitment and phosphorylation of Lat from subsynaptic vesicles. Studies of Lat mutants confirmed that recruitment preceded and was essential for phosphorylation and that both processes were independent of surface clustering of Lat. Our data suggest that TCR ligation preconditions the membrane for vesicle recruitment and bulk activation of the Lat signaling network.
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42
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Hayashi K, Kamikawa Y. HSP90 is crucial for regulation of LAT expression in activated T cells. Mol Immunol 2011; 48:941-6. [PMID: 21251717 DOI: 10.1016/j.molimm.2010.12.014] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2010] [Revised: 12/20/2010] [Accepted: 12/30/2010] [Indexed: 11/18/2022]
Abstract
T cell response initiated by engagement of T cell receptor (TCR) is dependent on signal transduction events composed of protein kinases and adaptor proteins. However, the molecular mechanism for gene expression of these proteins is not entirely understood. Here we identified Heat Shock Protein 90 (HSP90) as an essential regulator for gene expression of Linker for activation of T cells (LAT) in primarily activated human T cells. Primarily activated T cells continuously synthesized LAT protein and treatment of cells with 17-AAG, a pharmacological inhibitor of HSP90, decreased LAT protein level following reduction of LAT mRNA. Furthermore, promoter activity of LAT gene was dramatically inhibited by 17-AAG. These results reveal a novel role of HSP90 as a positive regulator for expression of LAT gene in activated T cells.
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Affiliation(s)
- Keitaro Hayashi
- Department of Pharmacology, Dokkyo Medical University School of Medicine, 880 Kitakobayashi, Mibu, Tochigi 321-0293, Japan.
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43
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Ladygina N, Martin BR, Altman A. Dynamic palmitoylation and the role of DHHC proteins in T cell activation and anergy. Adv Immunol 2011; 109:1-44. [PMID: 21569911 DOI: 10.1016/b978-0-12-387664-5.00001-7] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Although protein S-palmitoylation was first characterized >30 years ago, and is implicated in the function, trafficking, and localization of many proteins, little is known about the regulation and physiological implications of this posttranslational modification. Palmitoylation of various signaling proteins required for TCR-induced T cell activation is also necessary for their proper function. Linker for activation of T cells (LAT) is an essential scaffolding protein involved in T cell development and activation, and we found that its palmitoylation is selectively impaired in anergic T cells. The recent discovery of the DHHC family of palmitoyl acyl transferases and the establishment of sensitive and quantitative proteomics-based methods for global analysis of the palmitoyl proteome led to significant progress in studying the biology and underlying mechanisms of cellular protein palmitoylation. We are using these approaches to explore the palmitoyl proteome in T lymphocytes and, specifically, the mechanistic basis for the impaired palmitoylation of LAT in anergic T cells. This chapter reviews the history of protein palmitoylation and its role in T cell activation, the DHHC family and new methodologies for global analysis of the palmitoyl proteome, and summarizes our recent work in this area. The new methodologies will accelerate the pace of research and provide a greatly improved mechanistic and molecular understanding of the complex process of protein palmitoylation and its regulation, and the substrate specificity of the novel DHHC family. Reversible protein palmitoylation will likely prove to be an important posttranslational mechanism that regulates cellular responses, similar to protein phosphorylation and ubiquitination.
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Affiliation(s)
- Nadejda Ladygina
- Division of Cell Biology, La Jolla Institute for Allergy and Immunology, California, USA
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44
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Cyclic AMP-mediated immune regulation--overview of mechanisms of action in T cells. Cell Signal 2010; 23:1009-16. [PMID: 21130867 DOI: 10.1016/j.cellsig.2010.11.018] [Citation(s) in RCA: 154] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2010] [Revised: 11/23/2010] [Accepted: 11/25/2010] [Indexed: 01/21/2023]
Abstract
The canonical second messenger cAMP is well established as a potent negative regulator of T cell immune function. Through protein kinase A (PKA) it regulates T cell function at the level of transcription factors, members of the mitogen-activated protein kinase pathway, phospholipases (PLs), Ras homolog (Rho)A and proteins involved in the control of cell cycle progression. Type I PKA is the predominant PKA isoform in T cells. Furthermore, whereas type II PKA is located at the centrosome, type I PKA is anchored close to the T cell receptor (TCR) in lipid rafts by the Ezrin-ERM-binding phosphoprotein of 50 kDa (EBP50)-phosphoprotein associated with glycosphingolipid-enriched microdomains (PAG) scaffold complex. The most TCR-proximal target for type I PKA is C-terminal Src kinase (Csk), which upon activation by raft recruitment and phosphorylation inhibits the Src family tyrosine kinases Lck and Fyn and thus functions to maintain T cell homeostasis. Recently, induction of cAMP levels in responder T cells has emerged as one of the mechanisms by which regulatory T (T(R)) cells execute their suppressive action. Thus, the cAMP-type I PKA-Csk pathway emerges as a putative target for therapeutic intervention in autoimmune disorders as well as in cancer, where T(R) cell-mediated suppression contributes to suboptimal local immune responses.
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45
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Shen S, Chuck MI, Zhu M, Fuller DM, Yang CWO, Zhang W. The importance of LAT in the activation, homeostasis, and regulatory function of T cells. J Biol Chem 2010; 285:35393-405. [PMID: 20837489 PMCID: PMC2975163 DOI: 10.1074/jbc.m110.145052] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2010] [Revised: 08/17/2010] [Indexed: 12/13/2022] Open
Abstract
LAT (linker for activation of T cells) is a transmembrane adaptor protein that plays an essential role in TCR-mediated signaling and thymocyte development. Because LAT-deficient mice have an early block in thymocyte development, we utilized an inducible system to delete LAT in primary T cells to study LAT function in T cell activation, homeostasis, and survival. Deletion of LAT caused primary T cells to become unresponsive to stimulation from the TCR and impaired T cell homeostatic proliferation and long term survival. Furthermore, deletion of LAT led to reduced expression of Foxp3, CTLA-4, and CD25 in T(reg) cells and impaired their function. Consequently, mice with LAT deleted developed a lymphoproliferative syndrome similar to that in LATY136F mice, although less severe. Our data implicate that LAT has positive and negative roles in the regulation of mature T cells.
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MESH Headings
- Adaptor Proteins, Signal Transducing/genetics
- Adaptor Proteins, Signal Transducing/immunology
- Adaptor Proteins, Signal Transducing/metabolism
- Animals
- Autoimmune Lymphoproliferative Syndrome/genetics
- Autoimmune Lymphoproliferative Syndrome/immunology
- Autoimmune Lymphoproliferative Syndrome/metabolism
- Blotting, Western
- Cell Proliferation/drug effects
- Cell Survival/drug effects
- Cell Survival/immunology
- Female
- Flow Cytometry
- Forkhead Transcription Factors/immunology
- Forkhead Transcription Factors/metabolism
- Homeostasis/drug effects
- Homeostasis/immunology
- Lymphocyte Activation/drug effects
- Lymphocyte Activation/immunology
- Male
- Membrane Proteins/genetics
- Membrane Proteins/immunology
- Membrane Proteins/metabolism
- Mice
- Mice, Knockout
- Phosphoproteins/genetics
- Phosphoproteins/immunology
- Phosphoproteins/metabolism
- Receptors, Antigen, T-Cell/immunology
- Receptors, Antigen, T-Cell/metabolism
- Signal Transduction/immunology
- Spleen/cytology
- Spleen/immunology
- Spleen/metabolism
- T-Lymphocytes/cytology
- T-Lymphocytes/immunology
- T-Lymphocytes/metabolism
- T-Lymphocytes, Regulatory/immunology
- T-Lymphocytes, Regulatory/metabolism
- Tamoxifen/pharmacology
- Thymus Gland/cytology
- Thymus Gland/immunology
- Thymus Gland/metabolism
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Affiliation(s)
- Shudan Shen
- From the Department of Immunology, Duke University Medical Center, Durham, North Carolina 27710
| | - Mariana I. Chuck
- From the Department of Immunology, Duke University Medical Center, Durham, North Carolina 27710
| | - Minghua Zhu
- From the Department of Immunology, Duke University Medical Center, Durham, North Carolina 27710
| | - Deirdre M. Fuller
- From the Department of Immunology, Duke University Medical Center, Durham, North Carolina 27710
| | - Chih-wen Ou Yang
- From the Department of Immunology, Duke University Medical Center, Durham, North Carolina 27710
| | - Weiguo Zhang
- From the Department of Immunology, Duke University Medical Center, Durham, North Carolina 27710
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46
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Martínez-Florensa M, García-Blesa A, Yélamos J, Muñoz-Suano A, Domínguez-Villar M, Valdor R, Alonso A, García-Cózar F, Aparicio P, Malissen B, Aguado E. Serine residues in the LAT adaptor are essential for TCR-dependent signal transduction. J Leukoc Biol 2010; 89:63-73. [PMID: 20940326 DOI: 10.1189/jlb.0509342] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
The adaptor protein LAT has a prominent role in the transduction of intracellular signals elicited by the TCR/CD3 complex. Upon TCR engagement, LAT becomes tyrosine-phosphorylated and thereby, recruits to the membrane several proteins implicated in the activation of downstream signaling pathways. However, little is known about the role of other conserved motifs present in the LAT sequence. Here, we report that the adaptor LAT contains several conserved serine-based motifs, which are essential for proper signal transduction through the TCR. Mutation of these serine motifs in the human T cell line Jurkat prevents proper calcium influx, MAPK activation, and IL-2 production in response to TCR/CD3 stimulation. Moreover, this mutant form of LAT has a reduced ability to bind to PLC-γ1 and SLP-76, although phosphorylation of tyrosine residues 132, 171, and 191 is not decreased, raising a possible role for the serine-based motifs of LAT for the binding of important partners. The functional role of LAT serine-based motifs in signal transduction could be mediated by an effect on tyrosine phosphorylation, as their mutation significantly diminishes the phosphorylation of tyrosine residue 226. In addition, these serine motifs seem to have a regulatory role, given that upon their mutation, ZAP-70 shows enhanced phosphorylation. Therefore, the LAT serine-based motifs likely regulate signaling pathways that are essential for T cell physiology.
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Affiliation(s)
- Mario Martínez-Florensa
- Departamento de Bioquimíca, Biología Molecular B e Inmunología, Facultad de Medicina, Universidad de Murcia, Murcia, Spain
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47
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Hořejší V, Otáhal P, Brdička T. LAT - an important raft-associated transmembrane adaptor protein. Delivered on 6 July 2009 at the 34th FEBS Congress in Prague, Czech Republic. FEBS J 2010; 277:4383-97. [DOI: 10.1111/j.1742-4658.2010.07831.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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48
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Balagopalan L, Coussens NP, Sherman E, Samelson LE, Sommers CL. The LAT story: a tale of cooperativity, coordination, and choreography. Cold Spring Harb Perspect Biol 2010; 2:a005512. [PMID: 20610546 DOI: 10.1101/cshperspect.a005512] [Citation(s) in RCA: 133] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The adapter molecule LAT is a nucleating site for multiprotein signaling complexes that are vital for the function and differentiation of T cells. Extensive investigation of LAT in multiple experimental systems has led to an integrated understanding of the formation, composition, regulation, dynamic movement, and function of LAT-nucleated signaling complexes. This review discusses interactions of signaling molecules that bind directly or indirectly to LAT and the role of cooperativity in stabilizing LAT-nucleated signaling complexes. In addition, it focuses on how imaging studies visualize signaling assemblies as signaling clusters and demonstrate their dynamic nature and cellular fate. Finally, this review explores the function of LAT based on the interpretation of mouse models using various LAT mutants.
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49
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Fuller DM, Zhang W. Regulation of lymphocyte development and activation by the LAT family of adapter proteins. Immunol Rev 2010; 232:72-83. [PMID: 19909357 DOI: 10.1111/j.1600-065x.2009.00828.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Transmembrane adapter proteins (TRAPs) are critical components of signaling pathways in lymphocytes, linking antigen receptor engagement to downstream cellular processes. While these proteins lack intrinsic enzymatic activity, their phosphorylation following receptor ligation allows them to function as scaffolds for the assembly of multi-molecular signaling complexes. Many TRAPs have recently been discovered, and numerous studies demonstrate their roles in the positive and negative regulation of lymphocyte maturation, activation, and differentiation. One such example is the linker for activation of T cells (LAT) family of adapter proteins. While LAT has been shown to play an indispensable role in T-cell and mast cell function, the other family members, linker for activation of B cells (LAB) and linker for activation of X cells (LAX), are necessary to fine-tune immune responses. In addition to its well-established role in the positive regulation of lymphocyte activation, LAT exerts an inhibitory effect on T-cell receptor-mediated signaling. Furthermore, LAT, along with LAB and LAX, plays a crucial role in establishing and maintaining tolerance. Here, we review recent data concerning the regulation of lymphocyte development and activation by the LAT family of proteins.
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Affiliation(s)
- Deirdre M Fuller
- Department of Immunology, Duke University Medical Center, Durham, NC 27710, USA
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50
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Roncagalli R, Mingueneau M, Grégoire C, Malissen M, Malissen B. LAT signaling pathology: an "autoimmune" condition without T cell self-reactivity. Trends Immunol 2010; 31:253-9. [PMID: 20542732 DOI: 10.1016/j.it.2010.05.001] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2010] [Revised: 04/27/2010] [Accepted: 05/03/2010] [Indexed: 01/18/2023]
Abstract
Partial loss-of-function mutations in several molecules involved in T-cell receptor (TCR) signaling result in inflammation and autoimmunity. How can mutations that reduce TCR signaling output, paradoxically lead to immune pathology? This review summarizes experiments demonstrating that mutations in the linker for activation of T cells (LAT) predispose toward aberrant T cell responses to antigen in the presence of normal thymic selection. In the absence of LAT, antigen-specific T cells give rise to self-perpetuating pro-inflammatory responses and induce the production of autoantibodies independently of TCR engagement. Therefore, some pathological conditions called "autoimmune" might not result from the presence of self-reactive T cells, but from defective mechanisms that normally keep T cell activation in check.
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Affiliation(s)
- Romain Roncagalli
- Centre d'Immunologie de Marseille-Luminy, Université de la Méditerranée, Case 906, 13288 Marseille Cedex 9, France
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