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Lee EHJ, Murad JP, Christian L, Gibson J, Yamaguchi Y, Cullen C, Gumber D, Park AK, Young C, Monroy I, Yang J, Stern LA, Adkins LN, Dhapola G, Gittins B, Chang WC, Martinez C, Woo Y, Cristea M, Rodriguez-Rodriguez L, Ishihara J, Lee JK, Forman SJ, Wang LD, Priceman SJ. Antigen-dependent IL-12 signaling in CAR T cells promotes regional to systemic disease targeting. Nat Commun 2023; 14:4737. [PMID: 37550294 PMCID: PMC10406808 DOI: 10.1038/s41467-023-40115-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Accepted: 07/13/2023] [Indexed: 08/09/2023] Open
Abstract
Chimeric antigen receptor (CAR) T cell therapeutic responses are hampered by limited T cell trafficking, persistence, and durable anti-tumor activity in solid tumors. However, these challenges can be largely overcome by relatively unconstrained synthetic engineering strategies. Here, we describe CAR T cells targeting tumor-associated glycoprotein-72 (TAG72), utilizing the CD28 transmembrane domain upstream of the 4-1BB co-stimulatory domain as a driver of potent anti-tumor activity and IFNγ secretion. CAR T cell-mediated IFNγ production facilitated by IL-12 signaling is required for tumor cell killing, which is recapitulated by engineering an optimized membrane-bound IL-12 (mbIL12) molecule in CAR T cells. These T cells show improved antigen-dependent T cell proliferation and recursive tumor cell killing in vitro, with robust in vivo efficacy in human ovarian cancer xenograft models. Locoregional administration of mbIL12-engineered CAR T cells promotes durable anti-tumor responses against both regional and systemic disease in mice. Safety and efficacy of mbIL12-engineered CAR T cells is demonstrated using an immunocompetent mouse model, with beneficial effects on the immunosuppressive tumor microenvironment. Collectively, our study features a clinically-applicable strategy to improve the efficacy of locoregionally-delivered CAR T cells engineered with antigen-dependent immune-modulating cytokines in targeting regional and systemic disease.
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Affiliation(s)
- Eric Hee Jun Lee
- Department of Hematology and Hematopoietic Cell Transplantation, City of Hope, Duarte, CA, 91010, USA
| | - John P Murad
- Department of Hematology and Hematopoietic Cell Transplantation, City of Hope, Duarte, CA, 91010, USA
| | - Lea Christian
- Department of Hematology and Hematopoietic Cell Transplantation, City of Hope, Duarte, CA, 91010, USA
| | - Jackson Gibson
- Department of Hematology and Hematopoietic Cell Transplantation, City of Hope, Duarte, CA, 91010, USA
| | - Yukiko Yamaguchi
- Department of Hematology and Hematopoietic Cell Transplantation, City of Hope, Duarte, CA, 91010, USA
| | - Cody Cullen
- Department of Hematology and Hematopoietic Cell Transplantation, City of Hope, Duarte, CA, 91010, USA
| | - Diana Gumber
- Irell and Manella Graduate School of Biological Sciences, Beckman Research Institute of City of Hope, Duarte, CA, 91010, USA
| | - Anthony K Park
- Department of Hematology and Hematopoietic Cell Transplantation, City of Hope, Duarte, CA, 91010, USA
| | - Cari Young
- Irell and Manella Graduate School of Biological Sciences, Beckman Research Institute of City of Hope, Duarte, CA, 91010, USA
| | - Isabel Monroy
- Department of Hematology and Hematopoietic Cell Transplantation, City of Hope, Duarte, CA, 91010, USA
| | - Jason Yang
- Department of Hematology and Hematopoietic Cell Transplantation, City of Hope, Duarte, CA, 91010, USA
| | - Lawrence A Stern
- Department of Hematology and Hematopoietic Cell Transplantation, City of Hope, Duarte, CA, 91010, USA
| | - Lauren N Adkins
- Department of Hematology and Hematopoietic Cell Transplantation, City of Hope, Duarte, CA, 91010, USA
| | - Gaurav Dhapola
- Department of Hematology and Hematopoietic Cell Transplantation, City of Hope, Duarte, CA, 91010, USA
| | - Brenna Gittins
- Department of Hematology and Hematopoietic Cell Transplantation, City of Hope, Duarte, CA, 91010, USA
| | - Wen-Chung Chang
- Department of Hematology and Hematopoietic Cell Transplantation, City of Hope, Duarte, CA, 91010, USA
| | - Catalina Martinez
- Department of Clinical and Translational Project Development, City of Hope, Duarte, CA, 91010, USA
| | - Yanghee Woo
- Department of Surgery, City of Hope, Duarte, CA, 91010, USA
| | - Mihaela Cristea
- Department of Medical Oncology and Therapeutics Research, City of Hope, Duarte, CA, 91010, USA
| | | | - Jun Ishihara
- Department of Bioengineering, Imperial College London, 86 Wood Lane, London, W120BZ, UK
| | - John K Lee
- Human Biology Division, Fred Hutchinson Cancer Center, Seattle, WA, 98019, USA
| | - Stephen J Forman
- Department of Hematology and Hematopoietic Cell Transplantation, City of Hope, Duarte, CA, 91010, USA
- Department of Immuno-Oncology, Beckman Research Institute of City of Hope, Duarte, CA, 91010, USA
| | - Leo D Wang
- Department of Immuno-Oncology, Beckman Research Institute of City of Hope, Duarte, CA, 91010, USA
- Department of Pediatrics, City of Hope, Duarte, CA, 91010, USA
| | - Saul J Priceman
- Department of Hematology and Hematopoietic Cell Transplantation, City of Hope, Duarte, CA, 91010, USA.
- Department of Immuno-Oncology, Beckman Research Institute of City of Hope, Duarte, CA, 91010, USA.
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Siemiątkowska A, Bryl M, Kosicka-Noworzyń K, Tvrdoň J, Gołda-Gocka I, Główka FK. Low on-treatment levels of serum soluble CD8 (sCD8) predict better outcomes in advanced non-small cell lung cancer patients treated with atezolizumab. Cancer Immunol Immunother 2023; 72:1853-1863. [PMID: 36688998 PMCID: PMC9870198 DOI: 10.1007/s00262-023-03377-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2022] [Accepted: 01/10/2023] [Indexed: 01/24/2023]
Abstract
BACKGROUND Immunotherapy has changed the paradigm of treating non-small cell lung cancer (NSCLC). But, selecting patients who will achieve long-term benefits from treatment remains unsatisfactory. Here, we investigated the possible use of the soluble form of CD8 antigen (sCD8) in predicting durable disease control after PD-1/PD-L1 blockade. CD8 is a marker of the cytotoxic T lymphocytes. Its soluble form (sCD8) is secreted under activation of the immune system but also has immunosuppressive properties. The data about serum sCD8 in patients dosed with anti-PD-1/PD-L1 drugs are lacking. METHODS AND RESULTS We included 42 NSCLC patients and collected samples at baseline and for the first 3 months of atezolizumab immunotherapy. The serum sCD8 concentrations were measured with the ELISA kit and correlated with treatment outcomes. Patients with durable (≥ 12 months) disease control presented lower serum sCD8 than those without long-term benefits. The sCD8 levels measured at the end of cycle 2 (sCD8.2) were the earliest time point that successfully differentiated patients (3.76 vs. 9.68 ng/mL, respectively, p < 0.001). Individuals with low sCD8.2 (≤ 4.09 ng/mL) presented longer progression-free survival (HR = 0.061, p < 0.001) and overall survival (HR = 0.104, p < 0.05) compared to individuals with high sCD8.2 (median values unreached vs. 4.4 months and 14.4 months for PFS and OS, respectively). CONCLUSIONS Serum sCD8 could be an early biomarker of durable disease control after anti-PD-L1 treatment. Higher sCD8 in patients with worse outcomes could suggest the inhibitory effect of sCD8 on cytotoxic T-cells activation.
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Affiliation(s)
- Anna Siemiątkowska
- Department of Physical Pharmacy and Pharmacokinetics, Poznan University of Medical Sciences, 3 Rokietnicka Street, 60-806, Poznań, Poland
| | - Maciej Bryl
- Department of Clinical Oncology with the Subdepartment of Diurnal Chemotherapy, Wielkopolska Center of Pulmonology and Thoracic Surgery, 62 Szamarzewskiego Street, 60-569 Poznań, Poland
| | - Katarzyna Kosicka-Noworzyń
- Department of Physical Pharmacy and Pharmacokinetics, Poznan University of Medical Sciences, 3 Rokietnicka Street, 60-806, Poznań, Poland
| | - Jakub Tvrdoň
- Department of Physical Pharmacy and Pharmacokinetics, Poznan University of Medical Sciences, 3 Rokietnicka Street, 60-806, Poznań, Poland
| | - Iwona Gołda-Gocka
- Department of Clinical Oncology with the Subdepartment of Diurnal Chemotherapy, Wielkopolska Center of Pulmonology and Thoracic Surgery, 62 Szamarzewskiego Street, 60-569 Poznań, Poland
| | - Franciszek K. Główka
- Department of Physical Pharmacy and Pharmacokinetics, Poznan University of Medical Sciences, 3 Rokietnicka Street, 60-806, Poznań, Poland
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Stephens HM, Kirkpatrick E, Mallis RJ, Reinherz EL, Lang MJ. Characterizing Biophysical Parameters of Single TCR-pMHC Interactions Using Optical Tweezers. Methods Mol Biol 2023; 2654:375-392. [PMID: 37106195 DOI: 10.1007/978-1-0716-3135-5_24] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
Abstract
αβ T cells are mechanosensors that leverage bioforces during immune surveillance for highly sensitive and specific antigen discrimination. Single-molecule studies are used to profile the initial TCRαβ-pMHC binding event, and various biophysical parameters can be identified. Isolating purified TCRαβ and pMHC molecules on a coverslip allows for direct measurements of the kinetics and conformational changes in the system and removes cellular components along the load pathway that may interfere with or mask subtle changes. Optical tweezers provide high resolution position and force information that map the bonding profile, including catch bond, and the ability to measure distinct conformational changes driven by forces. The present method describes the single-molecule optical tweezers assay setup, considerations, and execution. This model can be used for various TCR-pMHC pairs or expanded to measure a wide variety of receptor-ligand interactions operative in multiple biological systems.
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Affiliation(s)
- Hannah M Stephens
- Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, TN, USA
| | - Evan Kirkpatrick
- Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, TN, USA
| | - Robert J Mallis
- Laboratory of Immunobiology and Department of Medical Oncology, Dana-Farber Cancer Institute, and Department of Dermatology, Harvard Medical School, Boston, MA, USA
| | - Ellis L Reinherz
- Laboratory of Immunobiology and Department of Medical Oncology, Dana-Farber Cancer Institute and Department of Medicine, Harvard Medical School, Boston, MA, USA
| | - Matthew J Lang
- Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, TN, USA.
- Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, TN, USA.
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Souter MN, Awad W, Li S, Pediongco TJ, Meehan BS, Meehan LJ, Tian Z, Zhao Z, Wang H, Nelson A, Le Nours J, Khandokar Y, Praveena T, Wubben J, Lin J, Sullivan LC, Lovrecz GO, Mak JY, Liu L, Kostenko L, Kedzierska K, Corbett AJ, Fairlie DP, Brooks AG, Gherardin NA, Uldrich AP, Chen Z, Rossjohn J, Godfrey DI, McCluskey J, Pellicci DG, Eckle SB. CD8 coreceptor engagement of MR1 enhances antigen responsiveness by human MAIT and other MR1-reactive T cells. J Exp Med 2022; 219:213423. [PMID: 36018322 PMCID: PMC9424912 DOI: 10.1084/jem.20210828] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Revised: 06/24/2022] [Accepted: 07/21/2022] [Indexed: 11/04/2022] Open
Abstract
Mucosal-associated invariant T (MAIT) cells detect microbial infection via recognition of riboflavin-based antigens presented by the major histocompatibility complex class I (MHC-I)-related protein 1 (MR1). Most MAIT cells in human peripheral blood express CD8αα or CD8αβ coreceptors, and the binding site for CD8 on MHC-I molecules is relatively conserved in MR1. Yet, there is no direct evidence of CD8 interacting with MR1 or the functional consequences thereof. Similarly, the role of CD8αα in lymphocyte function remains ill-defined. Here, using newly developed MR1 tetramers, mutated at the CD8 binding site, and by determining the crystal structure of MR1-CD8αα, we show that CD8 engaged MR1, analogous to how it engages MHC-I molecules. CD8αα and CD8αβ enhanced MR1 binding and cytokine production by MAIT cells. Moreover, the CD8-MR1 interaction was critical for the recognition of folate-derived antigens by other MR1-reactive T cells. Together, our findings suggest that both CD8αα and CD8αβ act as functional coreceptors for MAIT and other MR1-reactive T cells.
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Affiliation(s)
- Michael N.T. Souter
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - Wael Awad
- Infection and Immunity Program and Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Melbourne, Australia
| | - Shihan Li
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - Troi J. Pediongco
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - Bronwyn S. Meehan
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - Lucy J. Meehan
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - Zehua Tian
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - Zhe Zhao
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - Huimeng Wang
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia,State Key Laboratory of Respiratory Disease, Guangzhou Institute of Respiratory Disease, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Adam Nelson
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - Jérôme Le Nours
- Infection and Immunity Program and Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Melbourne, Australia
| | - Yogesh Khandokar
- Infection and Immunity Program and Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Melbourne, Australia
| | - T. Praveena
- Infection and Immunity Program and Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Melbourne, Australia
| | - Jacinta Wubben
- Infection and Immunity Program and Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Melbourne, Australia
| | - Jie Lin
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - Lucy C. Sullivan
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - George O. Lovrecz
- Biomedical Manufacturing, Commonwealth Scientific and Industrial Research Organisation, Melbourne, Australia
| | - Jeffrey Y.W. Mak
- Division of Chemistry and Structural Biology, Institute for Molecular Bioscience, The University of Queensland, Brisbane, Australia
| | - Ligong Liu
- Division of Chemistry and Structural Biology, Institute for Molecular Bioscience, The University of Queensland, Brisbane, Australia
| | - Lyudmila Kostenko
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - Katherine Kedzierska
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - Alexandra J. Corbett
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - David P. Fairlie
- Division of Chemistry and Structural Biology, Institute for Molecular Bioscience, The University of Queensland, Brisbane, Australia
| | - Andrew G. Brooks
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - Nicholas A. Gherardin
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - Adam P. Uldrich
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - Zhenjun Chen
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - Jamie Rossjohn
- Infection and Immunity Program and Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Melbourne, Australia,Institute of Infection and Immunity, School of Medicine, Cardiff University, Cardiff, UK
| | - Dale I. Godfrey
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - James McCluskey
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - Daniel G. Pellicci
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia,Murdoch Children’s Research Institute, Parkville, Melbourne, Australia
| | - Sidonia B.G. Eckle
- Department of Microbiology and Immunology, The University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
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Farhadi SA, Restuccia A, Sorrentino A, Cruz-Sánchez A, Hudalla GA. Heterogeneous protein co-assemblies with tunable functional domain stoichiometry. MOLECULAR SYSTEMS DESIGN & ENGINEERING 2022; 7:44-57. [PMID: 35495737 PMCID: PMC9053397 DOI: 10.1039/d1me00083g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
In nature, the precise heterogeneous co-assembly of different protein domains gives rise to supramolecular machines that perform complex functions through the co-integrated activity of the individual protein subunits. A synthetic approach capable of mimicking this process would afford access to supramolecular machines with new or improved functional capabilities. Here we show that the distinct peptide strands of a heterotrimeric α-helical coiled-coil (i.e., peptides "A", "B", and "C") can be used as fusion tags for heterogeneous co-assembly of proteins into supramolecular structures with tunable subunit stoichiometry. In particular, we demonstrate that recombinant fusion of A with NanoLuc luciferase (NL-A), B with superfolder green fluorescent protein (sfGFP-B), and C with mRuby (mRuby-C) enables formation of ternary complexes capable of simultaneously emitting blue, green, and red light via sequential bioluminescence and fluorescence resonance energy transfer (BRET/FRET). Fusion of galectin-3 onto the C-terminus of NL-A, sfGFP-B, and mRuby-C endows the ternary complexes with lactose-binding affinity that can be tuned by varying the number of galectin-3 domains integrated into the complex from one to three, while maintaining BRET/FRET function. The modular nature of the fusion protein design, the precise control of domain stoichiometry, and the multiplicity afforded by the three-stranded coiled-coil scaffold provides access to a greater range of subunit combinations than what is possible with heterodimeric coiled-coils used previously. We envision that access to this expanded range of co-integrated protein domain diversity will be advantageous for future development of designer supramolecular machines for therapeutic, diagnostic, and biotechnology applications.
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Affiliation(s)
- Shaheen A. Farhadi
- J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, FL, 32611, USA
| | - Antonietta Restuccia
- J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, FL, 32611, USA
| | - Anthony Sorrentino
- J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, FL, 32611, USA
| | - Andrés Cruz-Sánchez
- J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, FL, 32611, USA
| | - Gregory A. Hudalla
- J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, FL, 32611, USA
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Pre-conditioning modifies the TME to enhance solid tumor CAR T cell efficacy and endogenous protective immunity. Mol Ther 2021; 29:2335-2349. [PMID: 33647456 PMCID: PMC8261088 DOI: 10.1016/j.ymthe.2021.02.024] [Citation(s) in RCA: 46] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Revised: 01/23/2021] [Accepted: 02/24/2021] [Indexed: 12/22/2022] Open
Abstract
Chimeric antigen receptor (CAR) T cell therapy has led to impressive clinical responses in patients with hematological malignancies; however, its effectiveness in patients with solid tumors has been limited. While CAR T cells for the treatment of advanced prostate and pancreas cancer, including those targeting prostate stem cell antigen (PSCA), are being clinically evaluated and are anticipated to show bioactivity, their safety and the impact of the immunosuppressive tumor microenvironment (TME) have not been faithfully explored preclinically. Using a novel human PSCA knockin (hPSCA-KI) immunocompetent mouse model, we evaluated the safety and therapeutic efficacy of PSCA-CAR T cells. We demonstrated that cyclophosphamide (Cy) pre-conditioning significantly modified the immunosuppressive TME and was required to uncover the efficacy of PSCA-CAR T cells in metastatic prostate and pancreas cancer models, with no observed toxicities in normal tissues with endogenous expression of PSCA. This combination dampened the immunosuppressive TME, generated pro-inflammatory myeloid and T cell signatures in tumors, and enhanced the recruitment of antigen-presenting cells, as well as endogenous and adoptively transferred T cells, resulting in long-term anti-tumor immunity.
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7
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Mørch AM, Bálint Š, Santos AM, Davis SJ, Dustin ML. Coreceptors and TCR Signaling - the Strong and the Weak of It. Front Cell Dev Biol 2020; 8:597627. [PMID: 33178706 PMCID: PMC7596257 DOI: 10.3389/fcell.2020.597627] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Accepted: 09/28/2020] [Indexed: 12/02/2022] Open
Abstract
The T-cell coreceptors CD4 and CD8 have well-characterized and essential roles in thymic development, but how they contribute to immune responses in the periphery is unclear. Coreceptors strengthen T-cell responses by many orders of magnitude - beyond a million-fold according to some estimates - but the mechanisms underlying these effects are still debated. T-cell receptor (TCR) triggering is initiated by the binding of the TCR to peptide-loaded major histocompatibility complex (pMHC) molecules on the surfaces of other cells. CD4 and CD8 are the only T-cell proteins that bind to the same pMHC ligand as the TCR, and can directly associate with the TCR-phosphorylating kinase Lck. At least three mechanisms have been proposed to explain how coreceptors so profoundly amplify TCR signaling: (1) the Lck recruitment model and (2) the pseudodimer model, both invoked to explain receptor triggering per se, and (3) two-step coreceptor recruitment to partially triggered TCRs leading to signal amplification. More recently it has been suggested that, in addition to initiating or augmenting TCR signaling, coreceptors effect antigen discrimination. But how can any of this be reconciled with TCR signaling occurring in the absence of CD4 or CD8, and with their interactions with pMHC being among the weakest specific protein-protein interactions ever described? Here, we review each theory of coreceptor function in light of the latest structural, biochemical, and functional data. We conclude that the oldest ideas are probably still the best, i.e., that their weak binding to MHC proteins and efficient association with Lck allow coreceptors to amplify weak incipient triggering of the TCR, without comprising TCR specificity.
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Affiliation(s)
- Alexander M. Mørch
- The Kennedy Institute of Rheumatology, University of Oxford, Oxford, United Kingdom
- Radcliffe Department of Medicine, John Radcliffe Hospital, University of Oxford, Oxford, United Kingdom
- MRC Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, United Kingdom
| | - Štefan Bálint
- The Kennedy Institute of Rheumatology, University of Oxford, Oxford, United Kingdom
| | - Ana Mafalda Santos
- Radcliffe Department of Medicine, John Radcliffe Hospital, University of Oxford, Oxford, United Kingdom
- MRC Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, United Kingdom
| | - Simon J. Davis
- Radcliffe Department of Medicine, John Radcliffe Hospital, University of Oxford, Oxford, United Kingdom
- MRC Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, United Kingdom
| | - Michael L. Dustin
- The Kennedy Institute of Rheumatology, University of Oxford, Oxford, United Kingdom
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8
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Goodall KJ, Nguyen A, McKenzie C, Eckle SBG, Sullivan LC, Andrews DM. The murine CD94/NKG2 ligand, Qa-1 b, is a high-affinity, functional ligand for the CD8αα homodimer. J Biol Chem 2020; 295:3239-3246. [PMID: 31992596 PMCID: PMC7062157 DOI: 10.1074/jbc.ra119.010509] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2019] [Revised: 01/22/2020] [Indexed: 11/06/2022] Open
Abstract
The immune co-receptor CD8 molecule (CD8) has two subunits, CD8α and CD8β, which can assemble into homo or heterodimers. Nonclassical (class-Ib) major histocompatibility complex (MHC) molecules (MHC-Ibs) have recently been identified as ligands for the CD8αα homodimer. This was demonstrated by the observation that histocompatibility 2, Q region locus 10 (H2-Q10) is a high-affinity ligand for CD8αα which also binds the MHC-Ib molecule H2-TL. This suggests that MHC-Ib proteins may be an extended source of CD8αα ligands. Expression of H2-T3/TL and H2-Q10 is restricted to the small intestine and liver, respectively, yet CD8αα-containing lymphocytes are present more broadly. Therefore, here we sought to determine whether murine CD8αα binds only to tissue-specific MHC-Ib molecules or also to ubiquitously expressed MHC-Ib molecules. Using recombinant proteins and surface plasmon resonance-based binding assays, we show that the MHC-Ib family furnishes multiple binding partners for murine CD8αα, including H2-T22 and the CD94/NKG2-A/B-activating NK receptor (NKG2) ligand Qa-1b We also demonstrate a hierarchy among MHC-Ib proteins with respect to CD8αα binding, in which Qa-1b > H2-Q10 > TL. Finally, we provide evidence that Qa-1b is a functional ligand for CD8αα, distinguishing it from its human homologue MHC class I antigen E (HLA-E). These findings provide additional clues as to how CD8αα-expressing cells are controlled in different tissues. They also highlight an unexpected immunological divergence of Qa-1b/HLA-E function, indicating the need for more robust studies of murine MHC-Ib proteins as models for human disease.
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Affiliation(s)
- Katharine Jennifer Goodall
- Department of Immunology and Pathology, Central Clinical School, Monash University, Melbourne, Victoria, 3004, Australia.
| | - Angela Nguyen
- Department of Immunology and Pathology, Central Clinical School, Monash University, Melbourne, Victoria, 3004, Australia
| | - Craig McKenzie
- Department of Immunology and Pathology, Central Clinical School, Monash University, Melbourne, Victoria, 3004, Australia
| | - Sidonia Barbara Guiomar Eckle
- Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria, 3000, Australia
| | - Lucy Catherine Sullivan
- Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria, 3000, Australia
| | - Daniel Mark Andrews
- Department of Immunology and Pathology, Central Clinical School, Monash University, Melbourne, Victoria, 3004, Australia
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9
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Pan Z, Tian Y, Cao C, Niu G. The Emerging Role of YAP/TAZ in Tumor Immunity. Mol Cancer Res 2019; 17:1777-1786. [PMID: 31308148 DOI: 10.1158/1541-7786.mcr-19-0375] [Citation(s) in RCA: 58] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2019] [Revised: 06/03/2019] [Accepted: 07/10/2019] [Indexed: 11/16/2022]
Abstract
Yes-associated protein (YAP)/WW domain-containing transcription regulator 1 (TAZ) is an important transcriptional regulator and effector of the Hippo signaling pathway that has emerged as a critical determinant of malignancy in many human tumors. YAP/TAZ expression regulates the cross-talk between immune cells and tumor cells in the tumor microenvironment through its influence on T cells, myeloid-derived suppressor cells, and macrophages. However, the mechanisms underlying these effects are poorly understood. An improved understanding of the role of YAP/TAZ in tumor immunity is essential for exploring innovative tumor treatments and making further breakthroughs in antitumor immunotherapy. This review primarily focuses on the role of YAP/TAZ in immune cells, their interactions with tumor cells, and how this impacts on tumorigenesis, progression, and therapy resistance.
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Affiliation(s)
- Zhaoji Pan
- Xuzhou Central Hospital, The Affiliated XuZhou Hospital of Medical College of Southeast University, Xuzhou, Jiangsu, P.R. China
| | - Yiqing Tian
- Xinyi People's Hospital, Xinyi, Xuzhou, Jiangsu, P.R. China.
| | - Chengsong Cao
- Xuzhou Central Hospital, The Affiliated XuZhou Hospital of Medical College of Southeast University, Xuzhou, Jiangsu, P.R. China
| | - Guoping Niu
- Xuzhou Central Hospital, The Affiliated XuZhou Hospital of Medical College of Southeast University, Xuzhou, Jiangsu, P.R. China
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10
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Rabiger FV, Bismarck D, Protschka M, Köhler G, Moore PF, Büttner M, von Buttlar H, Alber G, Eschke M. Canine tissue-associated CD4+CD8α+ double-positive T cells are an activated T cell subpopulation with heterogeneous functional potential. PLoS One 2019; 14:e0213597. [PMID: 30865691 PMCID: PMC6415905 DOI: 10.1371/journal.pone.0213597] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2018] [Accepted: 02/25/2019] [Indexed: 12/28/2022] Open
Abstract
Canine CD4+CD8α+ double-positive (dp) T cells of peripheral blood are a unique effector memory T cell subpopulation characterized by an increased expression of activation markers in comparison with conventional CD4+ or CD8α+ single-positive (sp) T cells. In this study, we investigated CD4+CD8α+ dp T cells in secondary lymphatic organs (i.e. mesenteric and tracheobronchial lymph nodes, spleen, Peyer’s patches) and non-lymphatic tissues (i.e. lung and epithelium of the small intestine) within a homogeneous group of healthy Beagle dogs by multi-color flow cytometry. The aim of this systematic analysis was to identify the tissue-specific localization and characteristics of this distinct T cell subpopulation. Our results revealed a mature extrathymic CD1a-CD4+CD8α+ dp T cell population in all analyzed organs, with highest frequencies within Peyer’s patches. Constitutive expression of the activation marker CD25 is a feature of many CD4+CD8α+ dp T cells independent of their localization and points to an effector phenotype. A proportion of lymph node CD4+CD8α+ dp T cells is FoxP3+ indicating regulatory potential. Within the intestinal environment, the cytotoxic marker granzyme B is expressed by CD4+CD8α+ dp intraepithelial lymphocytes. In addition, a fraction of CD4+CD8α+ dp intraepithelial lymphocytes and of mesenteric lymph node CD4+CD8α+ dp T cells is TCRγδ+. However, the main T cell receptor of all tissue-associated CD4+CD8α+ dp T cells could be identified as TCRαβ. Interestingly, the majority of the CD4+CD8α+ dp T cell subpopulation expresses the unconventional CD8αα homodimer, in contrast to CD8α+ sp T cells, and CD4+CD8α+ dp thymocytes which are mainly CD8αβ+. The presented data provide the basis for a functional analysis of tissue-specific CD4+CD8α+ dp T cells to elucidate their role in health and disease of dogs.
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Affiliation(s)
- Friederike V. Rabiger
- Institute of Immunology/Molecular Pathogenesis, Center for Biotechnology and Biomedicine, College of Veterinary Medicine, University of Leipzig, Leipzig, Germany
| | - Doris Bismarck
- Institute of Immunology/Molecular Pathogenesis, Center for Biotechnology and Biomedicine, College of Veterinary Medicine, University of Leipzig, Leipzig, Germany
| | - Martina Protschka
- Institute of Immunology/Molecular Pathogenesis, Center for Biotechnology and Biomedicine, College of Veterinary Medicine, University of Leipzig, Leipzig, Germany
| | | | - Peter F. Moore
- Department of Pathology, Microbiology and Immunology, School of Veterinary Medicine, University of California, Davis, Davis, United States
| | - Mathias Büttner
- Institute of Immunology/Molecular Pathogenesis, Center for Biotechnology and Biomedicine, College of Veterinary Medicine, University of Leipzig, Leipzig, Germany
| | - Heiner von Buttlar
- Institute of Immunology/Molecular Pathogenesis, Center for Biotechnology and Biomedicine, College of Veterinary Medicine, University of Leipzig, Leipzig, Germany
| | - Gottfried Alber
- Institute of Immunology/Molecular Pathogenesis, Center for Biotechnology and Biomedicine, College of Veterinary Medicine, University of Leipzig, Leipzig, Germany
- * E-mail:
| | - Maria Eschke
- Institute of Immunology/Molecular Pathogenesis, Center for Biotechnology and Biomedicine, College of Veterinary Medicine, University of Leipzig, Leipzig, Germany
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11
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Goodall KJ, Nguyen A, Matsumoto A, McMullen JR, Eckle SB, Bertolino P, Sullivan LC, Andrews DM. Multiple receptors converge on H2-Q10 to regulate NK and γδT-cell development. Immunol Cell Biol 2019; 97:326-339. [PMID: 30537346 DOI: 10.1111/imcb.12222] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Revised: 12/03/2018] [Accepted: 12/06/2018] [Indexed: 01/10/2023]
Abstract
Class Ib major histocompatibility complex (MHC) is an extended family of molecules, which demonstrate tissue-specific expression and presentation of monomorphic antigens. These characteristics tend to imbue class Ib MHC with unique functions. H2-Q10 is potentially one such molecule that is overexpressed in the liver but its immunological function is not known. We have previously shown that H2-Q10 is a ligand for the natural killer cell receptor Ly49C and now, using H2-Q10-deficient mice, we demonstrate that H2-Q10 can also stabilize the expression of Qa-1b. In the absence of H2-Q10, the development and maturation of conventional hepatic natural killer cells is disrupted. We also provide evidence that H2-Q10 is a new high affinity ligand for CD8αα and controls the development of liver-resident CD8αα γδT cells. These data demonstrate that H2-Q10 has multiple roles in the development of immune subsets and identify an overlap of recognition within the class Ib MHC that is likely to be relevant to the regulation of immunity.
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Affiliation(s)
- Katharine J Goodall
- Department of Immunology and Pathology, Central Clinical School, Monash University, Melbourne, VIC, Australia
| | - Angela Nguyen
- Department of Immunology and Pathology, Central Clinical School, Monash University, Melbourne, VIC, Australia
| | - Aya Matsumoto
- Baker Heart and Diabetes Institute, Melbourne, VIC, Australia
| | - Julie R McMullen
- Baker Heart and Diabetes Institute, Melbourne, VIC, Australia.,Department of Medicine, Monash University, Clayton, VIC, Australia.,Department of Physiology, Monash University, Clayton, VIC, Australia
| | - Sidonia B Eckle
- Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, VIC, Australia
| | - Patrick Bertolino
- Liver Immunology program Centenary Institute, AW Morrow Gastroenterology and Liver Centre and Royal Prince Alfred Hospital, University of Sydney, Sydney, NSW, Australia
| | - Lucy C Sullivan
- Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, VIC, Australia
| | - Daniel M Andrews
- Department of Immunology and Pathology, Central Clinical School, Monash University, Melbourne, VIC, Australia
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12
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Martins MA, Tully DC, Shin YC, Gonzalez-Nieto L, Weisgrau KL, Bean DJ, Gadgil R, Gutman MJ, Domingues A, Maxwell HS, Magnani DM, Ricciardi M, Pedreño-Lopez N, Bailey V, Cruz MA, Lima NS, Bonaldo MC, Altman JD, Rakasz E, Capuano S, Reimann KA, Piatak M, Lifson JD, Desrosiers RC, Allen TM, Watkins DI. Rare Control of SIVmac239 Infection in a Vaccinated Rhesus Macaque. AIDS Res Hum Retroviruses 2017; 33:843-858. [PMID: 28503929 DOI: 10.1089/aid.2017.0046] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
Effector memory T cell (TEM) responses display potent antiviral properties and have been linked to stringent control of simian immunodeficiency virus (SIV) replication. Since recurrent antigen stimulation drives the differentiation of CD8+ T cells toward the TEM phenotype, in this study we incorporated a persistent herpesviral vector into a heterologous prime/boost/boost vaccine approach to maximize the induction of TEM responses. This new regimen resulted in CD8+ TEM-biased responses in four rhesus macaques, three of which controlled viral replication to <1,000 viral RNA copies/ml of plasma for more than 6 months after infection with SIVmac239. Over the course of this study, we made a series of interesting observations in one of these successful controller animals. Indeed, in vivo elimination of CD8αβ+ T cells using a new CD8β-depleting antibody did not abrogate virologic control in this monkey. Only after its CD8α+ lymphocytes were depleted did SIV rebound, suggesting that CD8αα+ but not CD8αβ+ cells were controlling viral replication. By 2 weeks postinfection (PI), the only SIV sequences that could be detected in this animal harbored a small in-frame deletion in nef affecting six amino acids. Deep sequencing of the SIVmac239 challenge stock revealed no evidence of this polymorphism. However, sequencing of the rebound virus following CD8α depletion at week 38.4 PI again revealed only the six-amino acid deletion in nef. While any role for immunological pressure on the selection of this deleted variant remains uncertain, our data provide anecdotal evidence that control of SIV replication can be maintained without an intact CD8αβ+ T cell compartment.
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Affiliation(s)
| | - Damien C. Tully
- Ragon Institute of MGH, MIT and Harvard, Cambridge, Massachusetts
| | - Young C. Shin
- Department of Pathology, University of Miami, Miami, Florida
| | | | - Kim L. Weisgrau
- Wisconsin National Primate Research Center, University of Wisconsin—Madison, Madison, Wisconsin
| | - David J. Bean
- Ragon Institute of MGH, MIT and Harvard, Cambridge, Massachusetts
| | - Rujuta Gadgil
- Ragon Institute of MGH, MIT and Harvard, Cambridge, Massachusetts
| | | | - Aline Domingues
- Department of Pathology, University of Miami, Miami, Florida
| | | | | | | | | | - Varian Bailey
- Department of Pathology, University of Miami, Miami, Florida
| | - Michael A. Cruz
- Department of Pathology, University of Miami, Miami, Florida
| | - Noemia S. Lima
- Laboratório de Biologia Molecular de Flavivirus, Instituto Oswaldo Cruz–FIOCRUZ, Rio de Janeiro, Brazil
| | - Myrna C. Bonaldo
- Laboratório de Biologia Molecular de Flavivirus, Instituto Oswaldo Cruz–FIOCRUZ, Rio de Janeiro, Brazil
| | - John D. Altman
- Department of Microbiology and Immunology, Emory University, Atlanta, Georgia
| | - Eva Rakasz
- Wisconsin National Primate Research Center, University of Wisconsin—Madison, Madison, Wisconsin
| | - Saverio Capuano
- Wisconsin National Primate Research Center, University of Wisconsin—Madison, Madison, Wisconsin
| | - Keith A. Reimann
- MassBiologics, University of Massachusetts Medical School, Boston, Massachusetts
| | - Michael Piatak
- AIDS and Cancer Virus Program, Leidos Biomedical Research, Inc., Frederick National Laboratory for Cancer Research, Frederick, Maryland
| | - Jeffrey D. Lifson
- AIDS and Cancer Virus Program, Leidos Biomedical Research, Inc., Frederick National Laboratory for Cancer Research, Frederick, Maryland
| | | | - Todd M. Allen
- Ragon Institute of MGH, MIT and Harvard, Cambridge, Massachusetts
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13
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Anderson CK, Brossay L. The role of MHC class Ib-restricted T cells during infection. Immunogenetics 2016; 68:677-91. [PMID: 27368413 DOI: 10.1007/s00251-016-0932-z] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Accepted: 05/22/2016] [Indexed: 01/02/2023]
Abstract
Even though major histocompatibility complex (MHC) class Ia and many Ib molecules have similarities in structure, MHC class Ib molecules tend to have more specialized functions, which include the presentation of non-peptidic antigens to non-classical T cells. Likewise, non-classical T cells also have unique characteristics, including an innate-like phenotype in naïve animals and rapid effector functions. In this review, we discuss the role of MAIT and NKT cells during infection but also the contribution of less studied MHC class Ib-restricted T cells such as Qa-1-, Qa-2-, and M3-restricted T cells. We focus on describing the types of antigens presented to non-classical T cells, their response and cytokine profile following infection, as well as the overall impact of these T cells to the immune system.
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Affiliation(s)
- Courtney K Anderson
- Department of Molecular Microbiology and Immunology, Division of Biology and Medicine, Brown University, Box G-B618, Providence, RI, 02912, USA
| | - Laurent Brossay
- Department of Molecular Microbiology and Immunology, Division of Biology and Medicine, Brown University, Box G-B618, Providence, RI, 02912, USA.
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14
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Reinherz EL, Wang JH. Codification of bidentate pMHC interaction with TCR and its co-receptor. Trends Immunol 2015; 36:300-6. [PMID: 25818864 PMCID: PMC4420642 DOI: 10.1016/j.it.2015.03.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2015] [Revised: 03/03/2015] [Accepted: 03/04/2015] [Indexed: 02/03/2023]
Abstract
A 1983 Immunology Today rostrum hypothesized that each T cell has two recognition units: a T cell receptor (TCR) complex, which binds antigen associated with a polymorphic region of a MHC molecule (pMHC), and a CD4 or CD8 molecule that binds to a conserved region of that same MHC gene product (class II or I, respectively). Structural biology has since precisely revealed those bidentate pMHC interactions. TCRαβ ligates the membrane-distal antigen-binding MHC platform, whereas CD8 clamps a membrane-proximal MHCI α3 domain loop and CD4 docks to a hydrophobic crevice between MHCII α2 and β2 domains. Here, we review how MHC class-restricted binding impacts signaling and lineage commitment, discussing TCR force-driven conformational transitions that may optimally expose the co-receptor docking site on MHC.
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Affiliation(s)
- Ellis L Reinherz
- Laboratory of Immunobiology and Department of Medical Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02115, USA; Department of Medicine, Harvard Medical School, Boston, MA 02115, USA.
| | - Jia-huai Wang
- Laboratory of Immunobiology and Department of Medical Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02115, USA; Department of Pediatrics, Harvard Medical School, Boston, MA 02115, USA; Department of Biological Chemistry & Molecular Pharmacology, Harvard Medical School, Boston, MA 02115, USA
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15
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Overgaard NH, Jung JW, Steptoe RJ, Wells JW. CD4+/CD8+ double-positive T cells: more than just a developmental stage? J Leukoc Biol 2014; 97:31-8. [PMID: 25360000 DOI: 10.1189/jlb.1ru0814-382] [Citation(s) in RCA: 192] [Impact Index Per Article: 19.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
CD4(+)/CD8(+) DP thymocytes are a well-described T cell developmental stage within the thymus. However, once differentiated, the CD4(+) lineage or the CD8(+) lineage is generally considered to be fixed. Nevertheless, mature CD4(+)/CD8(+) DP T cells have been described in the blood and peripheral lymphoid tissues of numerous species, as well as in numerous disease settings, including cancer. The expression of CD4 and CD8 is regulated by a very strict transcriptional program involving the transcription factors Runx3 and ThPOK. Initially thought to be mutually exclusive within CD4(+) and CD8(+) T cells, CD4(+)/CD8(+) T cell populations, outside of the thymus, have recently been described to express concurrently ThPOK and Runx3. Considerable heterogeneity exists within the CD4(+)/CD8(+) DP T cell pool, and the function of CD4(+)/CD8(+) T cell populations remains controversial, with conflicting reports describing cytotoxic or suppressive roles for these cells. In this review, we describe how transcriptional regulation, lineage of origin, heterogeneity of CD4 and CD8 expression, age, species, and specific disease settings influence the functionality of this rarely studied T cell population.
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Affiliation(s)
- Nana H Overgaard
- The University of Queensland Diamantina Institute, The University of Queensland, Translational Research Institute, Brisbane, Queensland, Australia; and Center for Cancer Immune Therapy, Department of Hematology, Copenhagen University Hospital, Herlev, Denmark
| | - Ji-Won Jung
- The University of Queensland Diamantina Institute, The University of Queensland, Translational Research Institute, Brisbane, Queensland, Australia; and
| | - Raymond J Steptoe
- The University of Queensland Diamantina Institute, The University of Queensland, Translational Research Institute, Brisbane, Queensland, Australia; and
| | - James W Wells
- The University of Queensland Diamantina Institute, The University of Queensland, Translational Research Institute, Brisbane, Queensland, Australia; and
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16
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Li XL, Teng MK, Reinherz EL, Wang JH. Strict Major Histocompatibility Complex Molecule Class-Specific Binding by Co-Receptors Enforces MHC-Restricted αβ TCR Recognition during T Lineage Subset Commitment. Front Immunol 2013; 4:383. [PMID: 24319443 PMCID: PMC3837227 DOI: 10.3389/fimmu.2013.00383] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2013] [Accepted: 11/04/2013] [Indexed: 01/22/2023] Open
Abstract
Since the discovery of co-receptor dependent αβTCR recognition, considerable effort has been spent on elucidating the basis of CD4 and CD8 lineage commitment in the thymus. The latter is responsible for generating mature CD4 helper and CD8αβ cytotoxic T cell subsets. Although CD4+ and CD8+ T cell recognition of peptide antigens is known to be MHC class II- and MHC class I-restricted, respectively, the mechanism of single positive (SP) thymocyte lineage commitment from bipotential double-positive (DP) progenitors is not fully elucidated. Classical models to explain thymic CD4 vs. CD8 fate determination have included a stochastic selection model or instructional models. The latter are based either on strength of signal or duration of signal impacting fate. More recently, differential co-receptor gene imprinting has been shown to be involved in expression of transcription factors impacting cytotoxic T cell development. Here, we address commitment from a structural perspective, focusing on the nature of co-receptor binding to MHC molecules. By surveying 58 MHC class II and 224 MHC class I crystal structures in the Protein Data Bank, it becomes clear that CD4 cannot bind to MHC I molecules, nor can CD8αβ or CD8αα bind to MHC II molecules. Given that the co-receptor delivers Lck to phosphorylate exposed CD3 ITAMs within a peptide/MHC (pMHC)-ligated TCR complex to initiate cell signaling, this strict co-receptor recognition fosters MHC class-restricted SP thymocyte lineage commitment at the DP stage even though both co-receptors are expressed on a single cell. In short, the binding preference of an αβTCR for a peptide complexed with an MHC molecule dictates which co-receptor subsequently binds, thereby supporting development of that subset lineage. How function within the lineage is linked further to biopotential fate determination is discussed.
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Affiliation(s)
- Xiao-Long Li
- School of Life Sciences, University of Science and Technology of China , Hefei , China ; College of Life Sciences, Peking University , Beijing , China
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17
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Cole DK, Laugel B, Clement M, Price DA, Wooldridge L, Sewell AK. The molecular determinants of CD8 co-receptor function. Immunology 2012; 137:139-48. [PMID: 22804746 DOI: 10.1111/j.1365-2567.2012.03625.x] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
CD8(+) T cells respond to signals mediated through a specific interaction between the T-cell receptor (TCR) and a composite antigen in the form of an epitopic peptide bound between the polymorphic α1 and α2 helices of an MHC class I (MHCI) molecule. The CD8 glycoprotein 'co-receives' antigen by binding to an invariant region of the MHCI molecule and can enhance ligand recognition by up to 1 million-fold. In recent years, a number of structural and biophysical investigations have shed light on the role of the CD8 co-receptor during T-cell antigen recognition. Here, we provide a collated resource for these data, and discuss how the structural and biophysical parameters governing CD8 co-receptor function further our understanding of T-cell cross-reactivity and the productive engagement of low-affinity antigenic ligands.
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Affiliation(s)
- David K Cole
- Institute of Infection and Immunity, Cardiff University School of Medicine, Cardiff, UK.
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18
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Wang JH, Reinherz EL. The structural basis of αβ T-lineage immune recognition: TCR docking topologies, mechanotransduction, and co-receptor function. Immunol Rev 2012; 250:102-19. [PMID: 23046125 PMCID: PMC3694212 DOI: 10.1111/j.1600-065x.2012.01161.x] [Citation(s) in RCA: 83] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Self versus non-self discrimination is at the core of T-lymphocyte recognition. To this end, αβ T-cell receptors (TCRs) ligate 'foreign' peptides bound to major histocompatibility complex (MHC) class I or class II molecules (pMHC) arrayed on the surface of antigen-presenting cells (APCs). Since the discovery of TCRs approximately 30 years ago, considerable structural and functional data have detailed the molecular basis of their extraordinary ligand specificity and sensitivity in mediating adaptive T-cell immunity. This review focuses on the structural biology of the Fab-like TCRαβ clonotypic heterodimer and its unique features in conjunction with those of the associated CD3εγ and CD3εδ heterodimeric molecules, which, along with CD3ζζ homodimer, comprise the TCR complex in a stoichiometry of 1:1:1:1. The basis of optimized TCRαβ docking geometry on the pMHC linked to TCR mechanotransduction and required for T-cell signaling as well as CD4 and CD8 co-receptor function is detailed. A model of the TCR ectodomain complex including its connecting peptides suggests how force generated during T-cell immune surveillance and at the immunological synapse results in dynamic TCR quaternary change involving its heterodimeric components. Potential insights from the structural biology relevant to immunity and immunosuppression are revealed.
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MESH Headings
- Animals
- Antigen-Presenting Cells/cytology
- Antigen-Presenting Cells/immunology
- Antigen-Presenting Cells/metabolism
- Antigens/chemistry
- Antigens/immunology
- Antigens/metabolism
- CD3 Complex/chemistry
- CD3 Complex/immunology
- CD3 Complex/metabolism
- CD4-Positive T-Lymphocytes/cytology
- CD4-Positive T-Lymphocytes/immunology
- CD4-Positive T-Lymphocytes/metabolism
- CD8-Positive T-Lymphocytes/cytology
- CD8-Positive T-Lymphocytes/immunology
- CD8-Positive T-Lymphocytes/metabolism
- Humans
- Major Histocompatibility Complex/immunology
- Mechanotransduction, Cellular
- Mice
- Models, Molecular
- Peptides/chemistry
- Peptides/immunology
- Peptides/metabolism
- Protein Conformation
- Protein Multimerization
- Receptors, Antigen, T-Cell, alpha-beta/chemistry
- Receptors, Antigen, T-Cell, alpha-beta/immunology
- Receptors, Antigen, T-Cell, alpha-beta/metabolism
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Affiliation(s)
- Jia-huai Wang
- Laboratory of Immunobiology and Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA, USA
- Department of Pediatrics, Harvard Medical School, Boston, MA, USA
- Department of Biological Chemistry & Molecular Pharmacology, Harvard Medical School, Boston, MA, USA
| | - Ellis L. Reinherz
- Laboratory of Immunobiology and Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA, USA
- Department of Medicine, Harvard Medical School, Boston, MA, USA
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19
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Laugel B, Cole DK, Clement M, Wooldridge L, Price DA, Sewell AK. The multiple roles of the CD8 coreceptor in T cell biology: opportunities for the selective modulation of self-reactive cytotoxic T cells. J Leukoc Biol 2011; 90:1089-99. [PMID: 21954283 DOI: 10.1189/jlb.0611316] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Short peptide fragments generated by intracellular protein cleavage are presented on the surface of most nucleated cells bound to highly polymorphic MHCI molecules. These pMHCI complexes constitute an interface that allows the immune system to identify and eradicate anomalous cells, such as those that harbor infectious agents, through the activation of CTLs. Molecular recognition of pMHCI complexes is mediated primarily by clonally distributed TCRs expressed on the surface of CTLs. The coreceptor CD8 contributes to this antigen-recognition process by binding to a largely invariant region of the MHCI molecule and by promoting intracellular signaling, the effects of which serve to enhance TCR stimuli triggered by cognate ligands. Recent investigations have shed light on the role of CD8 in the activation of MHCI-restricted, antigen-experienced T cells and in the processes of T cell selection and lineage commitment in the thymus. Here, we review these data and discuss their implications for the development of potential therapeutic strategies that selectively target pathogenic CTL responses erroneously directed against self-derived antigens.
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Affiliation(s)
- Bruno Laugel
- School of Medicine, Cardiff University, Heath Park, Cardiff, CF14 4XN Wales, UK.
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20
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CD8αα and -αβ isotypes are equally recruited to the immunological synapse through their ability to bind to MHC class I. EMBO Rep 2011; 12:1251-6. [PMID: 22081144 DOI: 10.1038/embor.2011.209] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2011] [Revised: 09/22/2011] [Accepted: 09/23/2011] [Indexed: 11/08/2022] Open
Abstract
Bimolecular fluorescence complementation was used to engineer CD8 molecules so that CD8αα and CD8αβ dimers can be independently visualized on the surface of a T cell during antigen recognition. Using this approach, we show that CD8αα is recruited to the immunological synapse almost as well as CD8αβ, but because the kinase Lck associates preferentially with CD8αβ in lipid rafts, CD8αα is the weaker co-receptor. During recognition of the strong CD8αα ligand H2-TL, CD8αα is preferentially recruited. Thus, recruitment of the two CD8 species correlates with their relative binding to the available ligands, rather than with the co-receptor functions of the CD8 species.
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21
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Wong RL, Liu B, Zhu X, You L, Kong L, Han KP, Lee HI, Chavaillaz PA, Jin M, Wang Y, Rhode PR, Wong HC. Interleukin-15:Interleukin-15 receptor α scaffold for creation of multivalent targeted immune molecules. Protein Eng Des Sel 2011; 24:373-83. [PMID: 21177283 PMCID: PMC3049345 DOI: 10.1093/protein/gzq116] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2010] [Revised: 10/27/2010] [Accepted: 11/23/2010] [Indexed: 12/22/2022] Open
Abstract
Human interleukin-15 (hIL-15) and its receptor α (hIL-15Rα) are co-expressed in antigen presenting cells allowing trans-presentation of the cytokine to immune effector cells. We exploited the high-affinity interactions between hIL-15 and the extracellular hIL-15Rα sushi domain (hIL-15RαSu) to create a functional scaffold for the design of multispecific fusion protein complexes. Using single-chain T cell receptors (scTCRs) as recognition domains linked to the IL-15:IL-15Rα scaffold, we generated both bivalent and bispecific complexes. In these fusions, the scTCR domains retain the antigen-binding activity and the hIL-15 domain exhibits receptor binding and biological activity. As expected, bivalent scTCR fusions exhibited improved antigen binding due to increased avidity, whereas fusions comprising two different scTCR domains were capable of binding two cognate peptide/MHC complexes. Bispecific molecules containing scTCR and scCD8αβ domains also exhibit enhanced binding to peptide/MHC complexes, demonstrating that the IL-15:IL-15Rα scaffold displays flexibility necessary to support multi-domain interactions with a given target. Surprisingly, functional heterodimeric molecules could be formed by co-expressing the TCR α and β chains separately as fusions to the hIL-15 and hIL-15RαSu domains. Together, these properties indicate that the hIL-15 and hIL-15RαSu domains can be used as versatile, functional scaffold for generating novel targeted immune molecules.
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Affiliation(s)
- Richard L. Wong
- Department of Biomedical Engineering, Cornell University, Ithaca, NY 14850, USA
| | - Bai Liu
- Altor BioScience Corporation, Miramar, FL 33025, USA
| | - Xiaoyun Zhu
- Altor BioScience Corporation, Miramar, FL 33025, USA
| | - Lijing You
- Altor BioScience Corporation, Miramar, FL 33025, USA
| | - Lin Kong
- Altor BioScience Corporation, Miramar, FL 33025, USA
| | - Kai-Ping Han
- Altor BioScience Corporation, Miramar, FL 33025, USA
| | - Hyung-il Lee
- Altor BioScience Corporation, Miramar, FL 33025, USA
| | | | - Moonsoo Jin
- Department of Biomedical Engineering, Cornell University, Ithaca, NY 14850, USA
| | - Yi Wang
- Department of Biomedical Engineering, Cornell University, Ithaca, NY 14850, USA
| | | | - Hing C. Wong
- Altor BioScience Corporation, Miramar, FL 33025, USA
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22
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Shen ZT, Brehm MA, Daniels KA, Sigalov AB, Selin LK, Welsh RM, Stern LJ. Bi-specific MHC heterodimers for characterization of cross-reactive T cells. J Biol Chem 2010; 285:33144-33153. [PMID: 20729210 PMCID: PMC2963422 DOI: 10.1074/jbc.m110.141051] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2010] [Revised: 07/25/2010] [Indexed: 11/06/2022] Open
Abstract
T cell cross-reactivity describes the phenomenon whereby a single T cell can recognize two or more different peptide antigens presented in complex with MHC proteins. Cross-reactive T cells have previously been characterized at the population level by cytokine secretion and MHC tetramer staining assays, but single-cell analysis is difficult or impossible using these methods. In this study, we describe development of a novel peptide-MHC heterodimer specific for cross-reactive T cells. MHC-peptide monomers were independently conjugated to hydrazide or aldehyde-containing cross-linkers using thiol-maleimide coupling at cysteine residues introduced into recombinant MHC heavy chain proteins. Hydrazone formation provided bi-specific MHC heterodimers carrying two different peptides. Using this approach we prepared heterodimers of the murine class I MHC protein H-2K(b) carrying peptides from lymphocytic choriomeningitis virus and vaccinia virus, and used these to identify cross-reactive CD8+ T cells recognizing both lymphocytic choriomeningitis virus and vaccinia virus antigens. A similar strategy could be used to develop reagents to analyze cross-reactive T cell responses in humans.
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Affiliation(s)
- Zu T Shen
- From the Department of Pathology, Worcester, Massachusetts 01655
| | | | - Keith A Daniels
- From the Department of Pathology, Worcester, Massachusetts 01655
| | | | - Liisa K Selin
- From the Department of Pathology, Worcester, Massachusetts 01655
| | - Raymond M Welsh
- From the Department of Pathology, Worcester, Massachusetts 01655
| | - Lawrence J Stern
- From the Department of Pathology, Worcester, Massachusetts 01655; Department of Biochemistry & Molecular Pharmacology, University of Massachusetts Medical School, Worcester, Massachusetts 01655.
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23
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TL and CD8αα: Enigmatic partners in mucosal immunity. Immunol Lett 2010; 134:1-6. [PMID: 20850477 DOI: 10.1016/j.imlet.2010.09.004] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2010] [Accepted: 09/09/2010] [Indexed: 11/23/2022]
Abstract
The intestinal mucosa represents a large surface area that is in contact with an immense antigenic load. The immune system associated with the intestinal mucosa needs to distinguish between innocuous food antigens, commensal microorganisms, and pathogenic microorganisms, without triggering an exaggerated immune response that may lead to excessive inflammation and/or development of inflammatory bowel disease. The thymus leukemia (TL) antigen and CD8αα are interacting surface molecules that are expressed at the frontline of the mucosal immune system: TL is expressed in intestinal epithelial cells (IEC) whereas CD8αα is expressed in lymphocytes, known as intraepithelial lymphocytes, that reside in between the IEC. In this review we discuss the significance of the interaction between TL and CD8αα in mucosal immunity during health and disease.
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24
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Zong L, Chen Y, Yan J, Zhang J. Expression, purification, crystallization and preliminary X-ray diffraction analysis of rhesus macaque CD8alphaalpha homodimer. Acta Crystallogr Sect F Struct Biol Cryst Commun 2010; 66:435-8. [PMID: 20383016 DOI: 10.1107/s1744309110005178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2009] [Accepted: 02/09/2010] [Indexed: 11/10/2022]
Abstract
As a T-cell co-receptor, CD8 binds to MHC class I molecules and plays a pivotal role in the activation of cytotoxic T lymphocytes. To date, structures of CD8 have been solved for two different mammals: human and mouse. The infection of rhesus macaques (Macaca mulatta) by simian immunodeficiency virus (SIV) is the best animal model for studying HIV. In this study, the rhesus macaque CD8 (rCD8) alphaalpha homodimer was obtained and rCD8alpha exodomain protein crystals were successfully obtained for further structural analysis. Diffraction data were collected to a resolution of 2.4 A. The crystal belonged to space group P2(1)2(1)2(1), with unit-cell parameters a = 46.52, b = 56.28, c = 82.40 A. These data will facilitate further studies on the structural differences between these CD8 structures and the cellular immune responses of rhesus macaque.
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Affiliation(s)
- Lili Zong
- Department of Obstetrics and Gynaecology, Integrated Traditional Chinese Medicine and Western Medicine Hospital, Nanfang Medical University, Guangzhou 510310, People's Republic of China.
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25
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Wang R, Natarajan K, Margulies DH. Structural basis of the CD8 alpha beta/MHC class I interaction: focused recognition orients CD8 beta to a T cell proximal position. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2009; 183:2554-64. [PMID: 19625641 PMCID: PMC2782705 DOI: 10.4049/jimmunol.0901276] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
In the immune system, B cells, dendritic cells, NK cells, and T lymphocytes all respond to signals received via ligand binding to receptors and coreceptors. Although the specificity of T cell recognition is determined by the interaction of T cell receptors with MHC/peptide complexes, the development of T cells in the thymus and their sensitivity to Ag are also dependent on coreceptor molecules CD8 (for MHC class I (MHCI)) and CD4 (for MHCII). The CD8alphabeta heterodimer is a potent coreceptor for T cell activation, but efforts to understand its function fully have been hampered by ignorance of the structural details of its interactions with MHCI. In this study we describe the structure of CD8alphabeta in complex with the murine MHCI molecule H-2D(d) at 2.6 A resolution. The focus of the CD8alphabeta interaction is the acidic loop (residues 222-228) of the alpha3 domain of H-2D(d). The beta subunit occupies a T cell membrane proximal position, defining the relative positions of the CD8alpha and CD8beta subunits. Unlike the CD8alphaalpha homodimer, CD8alphabeta does not contact the MHCI alpha(2)- or beta(2)-microglobulin domains. Movements of the CD8alpha CDR2 and CD8beta CDR1 and CDR2 loops as well as the flexibility of the H-2D(d) CD loop facilitate the monovalent interaction. The structure resolves inconclusive data on the topology of the CD8alphabeta/MHCI interaction, indicates that CD8beta is crucial in orienting the CD8alphabeta heterodimer, provides a framework for understanding the mechanistic role of CD8alphabeta in lymphoid cell signaling, and offers a tangible context for design of structurally altered coreceptors for tumor and viral immunotherapy.
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Affiliation(s)
- Rui Wang
- Molecular Biology Section, Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892-1892
| | - Kannan Natarajan
- Molecular Biology Section, Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892-1892,Address correspondence and reprint requests to Dr. Kannan Natarajan, or Dr. David H. Margulies, Molecular Biology Section, Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bldg. 10, Room 11N311; 10 Center Drive, Bethesda, MD 20892-1892. and
| | - David H. Margulies
- Molecular Biology Section, Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892-1892,Address correspondence and reprint requests to Dr. Kannan Natarajan, or Dr. David H. Margulies, Molecular Biology Section, Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bldg. 10, Room 11N311; 10 Center Drive, Bethesda, MD 20892-1892. and
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26
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Gibbings D, Befus AD. CD4 and CD8: an inside-out coreceptor model for innate immune cells. J Leukoc Biol 2009; 86:251-9. [PMID: 19401396 DOI: 10.1189/jlb.0109040] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
CD8 and CD4 are expressed by several cell types that do not express TCR. These include DCs, macrophages, monocytes, and NK cells. CD8(+) monocytes and macrophages are abundant at the site of pathology in many rat disease models, particularly those involving immune complex-mediated pathology. Indeed, in some disease models, CD8(+) macrophages correlate with severity of pathology or directly cause pathology or tumor cell killing. Evidence suggests CD8 or CD4 can enhance FcgammaR-dependent responses of human monocytes. Building on data that key components of TCR and FcgammaR signaling can substitute one another efficiently, we postulate that CD4 and CD8 operate with FcgammaR and potentially other receptors to enhance responses of T cells and various innate immune cells. Our model suggests CD8 on myeloid cells may contribute directly to tumor killing and tissue pathology by enhancing FcgammaR responses. Moreover, the model suggests a role for CD8 in cross-presentation of antibody-associated antigen by DCs and a new mechanism to regulate TCR sensitivity.
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Affiliation(s)
- Derrick Gibbings
- Department of Medicine, University of Alberta, Edmonton, Alberta, Canada.
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27
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Stone JD, Chervin AS, Kranz DM. T-cell receptor binding affinities and kinetics: impact on T-cell activity and specificity. Immunology 2009; 126:165-76. [PMID: 19125887 DOI: 10.1111/j.1365-2567.2008.03015.x] [Citation(s) in RCA: 266] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
The interaction between the T-cell receptor (TCR) and its peptide-major histocompatibility complex (pepMHC) ligand plays a critical role in determining the activity and specificity of the T cell. The binding properties associated with these interactions have now been studied in many systems, providing a framework for a mechanistic understanding of the initial events that govern T-cell function. There have been various other reviews that have described the structural and biochemical features of TCR : pepMHC interactions. Here we provide an overview of four areas that directly impact our understanding of T-cell function, as viewed from the perspective of the TCR : pepMHC interaction: (1) relationships between T-cell activity and TCR : pepMHC binding parameters, (2) TCR affinity, avidity and clustering, (3) influence of coreceptors on pepMHC binding by TCRs and T-cell activity, and (4) impact of TCR binding affinity on antigenic peptide specificity.
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Affiliation(s)
- Jennifer D Stone
- Department of Biochemistry, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
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28
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Rettig L, McNeill L, Sarner N, Guillaume P, Luescher I, Tolaini M, Kioussis D, Zamoyska R. An essential role for the stalk region of CD8 beta in the coreceptor function of CD8. THE JOURNAL OF IMMUNOLOGY 2009; 182:121-9. [PMID: 19109142 DOI: 10.4049/jimmunol.182.1.121] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The CD8alphabeta heterodimer is integral to the selection of the class I-restricted lineage in the thymus; however, the contribution of the CD8beta chain to coreceptor function is poorly understood. To understand whether the CD8beta membrane proximal stalk region played a role in coreceptor function, we substituted it with the corresponding sequence from the CD8alpha polypeptide and expressed the hybrid molecule in transgenic mice in place of endogenous CD8beta. Although the stalk-swapped CD8beta was expressed on the cell surface as a disulfide-bonded heterodimer at equivalent levels of expression to an endogenous CD8beta molecule, it failed to restore selection of CD8(+) class I MHC-restricted T cells and it altered the response of peripheral T cells. Thus, the stalk region of the CD8beta polypeptide has an essential role in ensuring functionality of the CD8alphabeta heterodimer and its replacement compromises the interaction of CD8 with peptide-MHC complexes.
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Affiliation(s)
- Lorna Rettig
- Molecular Immunology, Medical Research Council National Institute for Medical Research, London, United Kingdom
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29
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Shore DA, Issafras H, Landais E, Teyton L, Wilson IA. The crystal structure of CD8 in complex with YTS156.7.7 Fab and interaction with other CD8 antibodies define the binding mode of CD8 alphabeta to MHC class I. J Mol Biol 2008; 384:1190-202. [PMID: 18929574 DOI: 10.1016/j.jmb.2008.09.069] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2008] [Revised: 09/19/2008] [Accepted: 09/24/2008] [Indexed: 11/18/2022]
Abstract
The CD8alphabeta heterodimer interacts with class I pMHC on antigen-presenting cells as a co-receptor for TCR-mediated activation of cytotoxic T cells. To characterize this immunologically important interaction, we used monoclonal antibodies (mAbs) specific to either CD8alpha or CD8beta to probe the mechanism of CD8alphabeta binding to pMHCI. The YTS156.7 mAb inhibits this interaction and blocks T cell activation. To elucidate the molecular basis for this inhibition, the crystal structure of the CD8alphabeta immunoglobulin-like ectodomains were determined in complex with mAb YTS156.7 Fab at 2.7 A resolution. The YTS156.7 epitope on CD8beta was identified and implies that residues in the CDR1 and CDR2-equivalent loops of CD8beta are occluded upon binding to class I pMHC. To further characterize the pMHCI/CD8alphabeta interaction, binding of class I tetramers to CD8alphabeta on the surface of T cells was assessed in the presence of anti-CD8 mAbs. In contrast to YTS156.7, mAb YTS105.18, which is specific for CD8alpha, does not inhibit binding of CD8alphabeta to class I tetramers, indicating the YTS105.18 epitope is not occluded in the pMHCI/CD8alphabeta complex. Together, these data indicate a model for the pMHCI/CD8alphabeta interaction similar to that observed for CD8alphaalpha in the CD8alphaalpha/pMHCI complex, but in which CD8alpha occupies the lower orientation (membrane proximal to the antigen presenting cell), and CD8beta occupies the upper position (membrane distal). The implication of this molecular assembly for the function of CD8alphabeta in T cell activation is discussed.
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Affiliation(s)
- D A Shore
- Department of Molecular Biology, The Scripps Research Institute, La Jolla, CA 92037, USA
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30
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Cook L, Miyahara N, Jin N, Wands JM, Taube C, Roark CL, Potter TA, Gelfand EW, O'Brien RL, Born WK. Evidence that CD8+ dendritic cells enable the development of gammadelta T cells that modulate airway hyperresponsiveness. THE JOURNAL OF IMMUNOLOGY 2008; 181:309-19. [PMID: 18566396 DOI: 10.4049/jimmunol.181.1.309] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Airway hyperresponsiveness (AHR), a hallmark of asthma and several other diseases, can be modulated by gammadelta T cells. In mice sensitized and challenged with OVA, AHR depends on allergen-specific alphabeta T cells; but Vgamma1+ gammadelta T cells spontaneously enhance AHR, whereas Vgamma4+ gammadelta T cells, after being induced by airway challenge, suppress AHR. The activity of these gammadelta T cell modulators is allergen nonspecific, and how they develop is unclear. We now show that CD8 is essential for the development of both the AHR suppressor and enhancer gammadelta T cells, although neither type needs to express CD8 itself. Both cell types encounter CD8-expressing non-T cells in the spleen, and their functional development in an otherwise CD8-negative environment can be restored with transferred spleen cell preparations containing CD8+ dendritic cells (DCs), but not CD8+ T cells or CD8- DCs. Our findings suggest that CD8+ DCs in the lymphoid tissues enable an early step in the development of gammadelta T cells through direct cell contact. DC-expressed CD8 might take part in this interaction.
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Affiliation(s)
- Laura Cook
- Department of Immunology, National Jewish Medical and Research Center, Denver, CO 80206, USA
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31
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Abstract
"The beginning of wisdom is found in doubting; by doubting we come to question, and by seeking we may come upon the truth." -Pierre Abélard. CD8 is a glycoprotein expressed on hematopoietic cells. Two isoforms of CD8, CD8alphabeta and CD8alphaalpha, have been identified that are distinct in their expression and function. Whereas CD8alphabeta serves as a T cell receptor (TCR) coreceptor to enhance the functional avidity and is constitutively expressed on MHC class I-restricted T cells, CD8alphaalpha marks T cells that are distinct from the conventional thymus-selected and MHC-restricted CD4(+) or CD8alphabeta(+) T cells. Inconsistent with a coreceptor function, CD8alphaalpha decreases antigen sensitivity of the TCR, and it can be transiently or permanently expressed on T cells, regardless of the MHC restriction of the TCR or the presence of conventional coreceptors. Together, these observations indicate that CD8alphaalpha on T cells marks a differentiation stage and that it likely functions as a TCR corepressor to negatively regulate T cell activation.
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32
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Vollers SS, Stern LJ. Class II major histocompatibility complex tetramer staining: progress, problems, and prospects. Immunology 2008; 123:305-13. [PMID: 18251991 DOI: 10.1111/j.1365-2567.2007.02801.x] [Citation(s) in RCA: 85] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
The use of major histocompatibility complex (MHC) tetramers in the detection and analysis of antigen-specific T cells has become more widespread since its introduction 11 years ago. Early challenges in the application of tetramer staining to CD4+ T cells centred around difficulties in the expression of various class II MHC allelic variants and the detection of low-frequency T cells in mixed populations. As many of the technical obstacles to class II MHC tetramer staining have been overcome, the focus has returned to uncertainties concerning how oligomer valency and T-cell receptor/MHC affinity affect tetramer binding. Such issues have become more important with an increase in the number of studies relying on direct ex vivo analysis of antigen-specific CD4+ T cells. In this review we discuss which problems in class II MHC tetramer staining have been solved to date, and which matters remain to be considered.
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Affiliation(s)
- Sabrina S Vollers
- Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, MA, USA
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33
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Cole DK, Dunn SM, Sami M, Boulter JM, Jakobsen BK, Sewell AK. T cell receptor engagement of peptide-major histocompatibility complex class I does not modify CD8 binding. Mol Immunol 2008; 45:2700-9. [PMID: 18243322 DOI: 10.1016/j.molimm.2007.12.009] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2007] [Accepted: 12/14/2007] [Indexed: 11/30/2022]
Abstract
Activation of cytotoxic T cells is initiated by engagement of the T-cell receptor (TCR) with peptide-major histocompatibility class I complexes (pMHCI). The CD8 co-receptor also binds to pMHCI, but at a distinct site, and allows the potential for tripartite TCR/pMHCI/CD8 interactions, which can increase T cell antigen sensitivity. There has been a substantial interest in the effect of the pMHCI/CD8 interaction upon TCR/pMHCI engagement, and several conflicting studies have examined this event, using the soluble extracellular domains of CD8 and the TCR, by surface plasmon resonance. However, the evidence to date suggests that the TCR engages cognate pMHCI before CD8 recruitment, so the question of whether TCR engagement alters CD8 binding is likely to be more relevant to the biological order of T cell antigen encounter. Here, we have examined the binding of CD8 to several variants of the HLA A2-restricted telomerase(540-548) antigen (ILAKFLHWL) and the HLA A2-restricted NY-ESO-1(157-165) antigen (SLLMWITQC) that bind to their cognate TCRs with distinct affinities and kinetics. These interactions represent a range of agonists that exhibit different CD8 dependency for activation of their respective T cells. By using engineered affinity enhanced TCRs to these ligands, which have extended off-rates of approximately 1h compared to seconds for the wildtype TCRs, we have examined pMHCI/CD8 binding before and during TCR-engagement. Here we show that the binding of the extracellular domain of the TCR to pMHCI does not transmit structural changes to the pMHCI-CD8 binding site that would alter the subsequent pMHCI/CD8 interaction.
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Affiliation(s)
- David K Cole
- Department of Medical Biochemistry & Immunology, Cardiff University, School of Medicine, Heath Park, Cardiff, CF14 4XN, UK.
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34
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Huang J, Edwards LJ, Evavold BD, Zhu C. Kinetics of MHC-CD8 interaction at the T cell membrane. THE JOURNAL OF IMMUNOLOGY 2008; 179:7653-62. [PMID: 18025211 DOI: 10.4049/jimmunol.179.11.7653] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
CD8 plays an important role in facilitating TCR-MHC interaction, promoting Ag recognition, and initiating T cell activation. MHC-CD8 binding kinetics have been measured in three dimensions by surface plasmon resonance technique using purified molecules. However, CD8 is a membrane-anchored, signaling kinase-linked, and TCR-associated molecule whose function depends on the cell membrane environment. Purified molecules lack their linkage to the membrane, which precludes interactions with other structures of the cell as well as signaling. Furthermore, three-dimensional binding in the fluid phase is biologically and physically distinct from two-dimensional binding across apposing cell membranes. As a first step toward characterizing the molecular interactions between T cells and APCs, we used a micropipette adhesion frequency assay to measure the adhesion kinetics of single mouse T cells interacting with single human RBCs coated with MHC. Using anti-TCR mAb we isolated and characterized the specific two-dimensional MHC-CD8 binding from the trimolecular TCR-MHC-CD8 interaction. The TCR-independent MHC-CD8 interaction has a very low affinity that depends on the MHC alleles, but not on the peptide complexed to the MHC and whether CD8 is an alphaalpha homodimer or an alphabeta heterodimer. Surprisingly, MHC-CD8 binding affinity varies with T cells from different TCR transgenic mice and these affinity differences were abolished by treatment with cholesterol oxidase to disrupt membrane rafts. These data highlight the relevance and importance of two-dimensional analysis of T cells and APCs and indicate that membrane rafts play an important role in modulating the affinity of cell-cell interactions.
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Affiliation(s)
- Jun Huang
- Coulter Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
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35
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Patel TR, Harding SE, Ebringerova A, Deszczynski M, Hromadkova Z, Togola A, Paulsen BS, Morris GA, Rowe AJ. Weak self-association in a carbohydrate system. Biophys J 2007; 93:741-9. [PMID: 17483161 PMCID: PMC1913144 DOI: 10.1529/biophysj.106.100891] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2006] [Accepted: 03/14/2007] [Indexed: 11/18/2022] Open
Abstract
The physiological importance of weak interactions between biological macromolecules (molar dissociation constants >10 microM) is now well recognized, particularly with regard to cell adhesion and immunological phenomena, and many weak interactions have been measured for proteins. The concomitant importance of carbohydrate-carbohydrate interactions has also been identified, although no weak interaction between pure carbohydrate systems has ever been measured. We now demonstrate for the first time to our knowledge using a powerful probe for weak interactions--sedimentation velocity in the analytical ultracentrifuge--that at least some carbohydrates (from the class of polysaccharides known as heteroxylans and demonstrated here to be biologically active) can show well-defined weak self-interactions of the "monomer-dimer" type frequently found in protein systems. The weak interaction between the heteroxylans is shown from a temperature dependence study to be likely to be hydrophobic in nature.
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Affiliation(s)
- Trushar R Patel
- National Centre for Macromolecular Hydrodynamics, School of Biosciences, University of Nottingham, Sutton Bonington Campus, Sutton Bonington, LE12 5RD, United Kingdom
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36
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Cole DK, Pumphrey NJ, Boulter JM, Sami M, Bell JI, Gostick E, Price DA, Gao GF, Sewell AK, Jakobsen BK. Human TCR-binding affinity is governed by MHC class restriction. THE JOURNAL OF IMMUNOLOGY 2007; 178:5727-34. [PMID: 17442956 DOI: 10.4049/jimmunol.178.9.5727] [Citation(s) in RCA: 161] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
T cell recognition is initiated by the binding of TCRs to peptide-MHCs (pMHCs), the interaction being characterized by weak affinity and fast kinetics. Previously, only 16 natural TCR/pMHC interactions have been measured by surface plasmon resonance (SPR). Of these, 5 are murine class I, 5 are murine class II, and 6 are human class I-restricted responses. Therefore, a significant gap exists in our understanding of human TCR/pMHC binding due to the limited SPR data currently available for human class I responses and the absence of SPR data for human class II-restricted responses. We have produced a panel of soluble TCR molecules originating from human T cells that respond to naturally occurring disease epitopes and their cognate pMHCs. In this study, we compare the binding affinity and kinetics of eight class-I-specific TCRs (TCR-Is) to pMHC-I with six class-II-specific TCRs (TCR-IIs) to pMHC-II using SPR. Overall, there is a substantial difference in the TCR-binding equilibrium constants for pMHC-I and pMHC-II, which arises from significantly faster on-rates for TCRs binding to pMHC-I. In contrast, the off-rates for all human TCR/pMHC interactions fall within a narrow window regardless of class restriction, thereby providing experimental support for the notion that binding half-life is the principal kinetic feature controlling T cell activation.
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Affiliation(s)
- David K Cole
- Nuffield Department of Clinical Medicine, John Radcliffe Hospital, University of Oxford, Oxford, United Kingdom
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37
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Krogsgaard M, Juang J, Davis MM. A role for "self" in T-cell activation. Semin Immunol 2007; 19:236-44. [PMID: 17548210 PMCID: PMC2731063 DOI: 10.1016/j.smim.2007.04.003] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/27/2007] [Revised: 04/16/2007] [Accepted: 04/17/2007] [Indexed: 11/24/2022]
Abstract
The mechanisms by which alphabeta T-cells are selected in the thymus and then recognize peptide MHC (pMHC) complexes in the periphery remain an enigma. Recent work particularly with respect to quantification of T-cell sensitivity and the role of self-ligands in T-cell activation has provided some important clues to the details of how TCR signaling might be initiated. Here, we highlight recent experimental data that provides insights into the initiation of T-cell activation and also discuss the main controversies and uncertainties in this area.
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Affiliation(s)
- Michelle Krogsgaard
- Department of Pathology and NYU Cancer Institute, NYU School of Medicine, New York, NY 10016, USA.
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38
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Cole DK, Rizkallah PJ, Boulter JM, Sami M, Vuidepot AL, Glick M, Gao F, Bell JI, Jakobsen BK, Gao GF. Computational design and crystal structure of an enhanced affinity mutant human CD8 αα coreceptor. Proteins 2007; 67:65-74. [PMID: 17243170 DOI: 10.1002/prot.21176] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Human CD8 is a T cell coreceptor, which binds to pHLA I and plays a pivotal role in the activation of cytotoxic T lymphocytes. Soluble recombinant CD8 alphaalpha has been shown to antagonize T cell activation, both in vitro and in vivo. However, because of a very low affinity for pHLA I, high concentrations of soluble CD8 alphaalpha are required for efficient inhibition. Based upon our knowledge of the wild-type CD8/pHLA I structure, we have designed and produced a mutated form of soluble CD8 alphaalpha that binds to pHLA I with approximately fourfold higher affinity. We have characterized the binding of the high affinity CD8 mutant using surface plasmon resonance and determined its structure at 2.1 A resolution using X-ray crystallography. The analysis of this structure suggests that the higher affinity is achieved by providing a larger side chain that allows for an optimal contact to be made between the HLA alpha3 loop and the mutated CDR-like loops of CD8.
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Affiliation(s)
- David K Cole
- Nuffield Department of Clinical Medicine, John Radcliffe Hospital, Oxford University, Oxford, United Kingdom
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39
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Lyons GE, Moore T, Brasic N, Li M, Roszkowski JJ, Nishimura MI. Influence of human CD8 on antigen recognition by T-cell receptor-transduced cells. Cancer Res 2007; 66:11455-61. [PMID: 17145893 DOI: 10.1158/0008-5472.can-06-2379] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The CD8 coreceptor on T cells has two functions. Namely, CD8 acts to stabilize the binding of the T-cell receptor (TCR) to the peptide-MHC complex while localizing p56(lck) (lck) to the TCR/CD3 complex to facilitate early signaling events. Although both functions may be critical for efficient activation of a CTL, little is known about how the structural versus signaling roles of CD8, together with the relative strength of the TCR, influences T-cell function. We have addressed these issues by introducing full-length and truncated versions of the CD8alpha and CD8beta chains into CD8(-) Jurkat cell clones expressing cloned TCRs with known antigen specificity and relative affinities. Using a combination of antigen recognition and tetramer-binding assays, we find that the intracellular lck-binding domain of CD8 is critical for enhanced T-cell activation regardless of the relative strength of the TCR. In contrast, the extracellular domain of CD8 seems to be critical for TCRs with lower affinity but not those with higher affinity. Based on our results, we conclude that there are different requirements for CD8 to enhance T-cell function depending on the strength of its TCR.
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Affiliation(s)
- Gretchen E Lyons
- Department of Surgery, The University of Chicago, Chicago, Illinois, USA
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40
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Kao C, Sandau MM, Daniels MA, Jameson SC. The sialyltransferase ST3Gal-I is not required for regulation of CD8-class I MHC binding during T cell development. THE JOURNAL OF IMMUNOLOGY 2006; 176:7421-30. [PMID: 16751387 DOI: 10.4049/jimmunol.176.12.7421] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The CD8 coreceptor plays a crucial role in thymocyte and T cell sensitivity by binding to class I MHC and recruiting downstream signaling molecules to the TCR. Previous studies reported considerable changes in TCR-independent CD8/class I MHC binding (i.e., CD8 noncognate interactions) during T cell development, changes that correlated with altered glycosylation of surface molecules. In particular, expression of the sialyltransferase ST3Gal-I has been proposed as a critical factor regulating the attenuation of CD8 avidity during the double-positive to CD8 single-positive progression. This hypothesis is strengthened by the fact that ST3Gal-I(-/-) animals show a profound disregulation of CD8 T cell homeostasis. In contrast to this model, however, we report in this study that ST3Gal-I deficiency had no detectable impact on CD8 noncognate binding to multimeric peptide/MHC class I ligands at any stage of thymocyte development. We also found that the susceptibility to CD8-induced cell death is not markedly influenced by ST3Gal-I deficiency. Thus, the profound effects of ST3Gal-I on CD8 T cell survival evidently do not involve a role for this enzyme in controlling CD8-class I binding.
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Affiliation(s)
- Charlly Kao
- University of Minnesota, Center for Immunology, Department of Laboratory Medicine and Pathology, Minneapolis, 55455, USA
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41
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Shore DA, Teyton L, Dwek RA, Rudd PM, Wilson IA. Crystal structure of the TCR co-receptor CD8alphaalpha in complex with monoclonal antibody YTS 105.18 Fab fragment at 2.88 A resolution. J Mol Biol 2006; 358:347-54. [PMID: 16530222 DOI: 10.1016/j.jmb.2006.02.016] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2005] [Revised: 02/02/2006] [Accepted: 02/08/2006] [Indexed: 10/25/2022]
Abstract
The CD8 glycoprotein functions as an essential element in the control of T-cell selection, maturation and the TCR-mediated response to peptide antigen. CD8 is expressed as both heterodimeric CD8alphabeta and homodimeric CD8alphaalpha isoforms, which have distinct physiological roles and exhibit tissue-specific expression patterns. CD8alphaalpha has previously been crystallized in complex with class I pMHC and, more recently, with the mouse class Ib thymic leukemia antigen (TL). Here, we present the crystal structure of a soluble form of mouse CD8alphaalpha in complex with rat monoclonal antibody YTS 105.18 Fab fragment at 2.88 A resolution. YTS 105.18, which is commonly used in the blockade of CD8+ T-cell activation in response to peptide antigen, is specific for mouse CD8alpha. The YTS 105.18 Fab is one of only five rat IgG Fab structures to have been reported to date. Analysis of the YTS 105.18 Fab epitope on CD8alpha reveals that this antibody blocks CD8 activity by hydrogen bonding to residues that are critical for interaction with both class I pMHC and TL. Structural comparison of the liganded and unliganded forms of soluble CD8alphaalpha indicates that the mouse CD8alphaalpha immunoglobulin-domain dimer does not undergo significant structural alteration upon interaction either with class I pMHC or TL.
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Affiliation(s)
- D A Shore
- Department of Molecular Biology, The Scripps Research Institute, La Jolla, CA 92037, USA
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42
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Shore DA, Wilson IA, Dwek RA, Rudd PM. Glycosylation and the function of the T cell co-receptor CD8. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2006; 564:71-84. [PMID: 16400808 DOI: 10.1007/0-387-25515-x_12] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
Affiliation(s)
- David A Shore
- The Glycobiology Institute, Department of Biochemistry, University of Oxford, Oxford OX1 3QU, UK
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Chang HC, Tan K, Ouyang J, Parisini E, Liu JH, Le Y, Wang X, Reinherz EL, Wang JH. Structural and Mutational Analyses of a CD8αβ Heterodimer and Comparison with the CD8αα Homodimer. Immunity 2005; 23:661-71. [PMID: 16356863 DOI: 10.1016/j.immuni.2005.11.002] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2005] [Revised: 10/20/2005] [Accepted: 11/16/2005] [Indexed: 12/31/2022]
Abstract
The crystal structure of a recombinant mouse single chain CD8alphabeta ectodomains at 2.4 A resolution reveals paired immunoglobulin variable region-like domains with a striking resemblance to CD8alphaalpha in size, shape, and surface electrostatic potential of complementarity-determining regions (CDR), despite <20% sequence identity between the CD8alpha and CD8beta subunits. Unlike the CD8alpha subunit(s) in the heterodimer or homodimer, the CDR1 loop of CD8beta tilts away from its corresponding CDR2 and CDR3 loops. Consistent with this observation, independent mutational studies reveal that alanine substitutions of residues in the CDR1 loop of CD8beta have no effect on CD8alphabeta coreceptor function, whereas mutations in CD8beta CDR2 and CDR3 loops abolish CD8alphabeta coreceptor activity. The implications of these findings and additional CD8alpha mutational studies for CD8alphabeta- versus CD8alphaalpha-MHCI binding are discussed.
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Affiliation(s)
- Hsiu-Ching Chang
- Laboratory of Immunobiology, Department of Medical Oncology, Dana-Farber Cancer Institute, Department of Medicine, Harvard Medical School, Boston, Massachusetts 02115, USA.
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44
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Attinger A, Devine L, Wang-Zhu Y, Martin D, Wang JH, Reinherz EL, Kronenberg M, Cheroutre H, Kavathas P. Molecular basis for the high affinity interaction between the thymic leukemia antigen and the CD8alphaalpha molecule. THE JOURNAL OF IMMUNOLOGY 2005; 174:3501-7. [PMID: 15749886 DOI: 10.4049/jimmunol.174.6.3501] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The mouse thymic leukemia (TL) Ag is a nonclassical MHC class I molecule that binds with higher affinity to CD8alphaalpha than CD8alphabeta. The interaction of CD8alphaalpha with TL is important for lymphocyte regulation in the intestine. Therefore, we studied the molecular basis for TL Ag binding to CD8alphaalpha. The stronger affinity of the TL Ag for CD8alphaalpha is largely mediated by three amino acids on exposed loops of the conserved alpha3 domain. Mutant classical class I molecules substituted with TL Ag amino acids at these positions mimic the ability to interact with CD8alphaalpha and modulate lymphocyte function. These data indicate that small changes in the alpha3 domain of class I molecules potentially can have profound physiologic consequences.
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Affiliation(s)
- Antoine Attinger
- La Jolla Institute for Allergy and Immunology, San Diego, CA 92121, USA
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45
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Giroux M, Denis F. Influence of calcium ions in the flow cytometric analysis of human CD8-positive cells. Cytometry A 2005; 62:61-4. [PMID: 15472901 DOI: 10.1002/cyto.a.20084] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
BACKGROUND The CD8 co-receptor is an important marker used to identify various lymphocyte subsets. A significant decrease in CD8alpha staining intensity was observed in the presence of divalent cation chelators. METHODS Peripheral blood mononuclear cells (PBMC) obtained from healthy volunteers were treated with calcium chelators, stained with different anti-human CD8 mAbs, and analyzed by flow cytometry. RESULTS Calcium chelators caused a dose-dependent decrease in fluorescence intensity, using specific anti-human CD8alpha mAbs. This phenomenon was not due to CD8 internalization and could be reversed by the addition of calcium ions. In contrast, calcium depletion increased staining intensity with one anti-CD8beta mAb. CONCLUSIONS Divalent cation chelators are used as cell anti-clumping agents in MACS or FACS applications. Researchers should be aware that such treatment could lead to the almost complete loss of fluorescence with selected anti-human CD8alpha mAbs. Since CD8 staining is used in conjunction with tetramer staining to identify antigen-specific cytotoxic human T cells, the effect of calcium depletion should be taken into account in experimental design.
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Affiliation(s)
- Martin Giroux
- INRS, Institut Armand-Frappier, 531 Boulevard des Prairies, Laval, Québec H7V 1B7, Canada
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46
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Swanson KA, Zheng Y, Heidler KM, Zhang ZD, Webb TJ, Wilkes DS. Flt3-ligand, IL-4, GM-CSF, and adherence-mediated isolation of murine lung dendritic cells: assessment of isolation technique on phenotype and function. THE JOURNAL OF IMMUNOLOGY 2004; 173:4875-81. [PMID: 15470028 DOI: 10.4049/jimmunol.173.8.4875] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Lung dendritic cells (DCs) are difficult to study due to their limited quantities and the complexities required for isolation. Although many procedures have been used to overcome this challenge, the effects of isolation techniques on lung DCs have not been reported. The current study shows that freshly isolated DCs (CD11c+) have limited ability to induce proliferation in allogeneic T cells, and are immature as indicated by low cell surface expression of costimulatory molecules compared with liver or splenic DCs. DCs isolated after overnight culture or from mice treated with Flt3L are phenotypically mature and potent stimulators of allogeneic T cells. DCs could not be propagated from lung mononuclear cells in response to IL-4 and GM-CSF. Contrary to data reported for nonpulmonary DCs, expression of CCR6 was decreased on mature lung DCs, and only a subset of mature DCs expressed higher levels of CCR7. Absence of CD8alpha expression indicates that freshly isolated DCs are myeloid-type, whereas mature DCs induced by overnight culture are both "lymphoid" (CD8alpha+) and "myeloid" (CD8alpha-). DCs from mice genetically deficient in CD8alpha expression were strong simulators of allogeneic T cells which was consistent with data showing that CD8alpha- DCs from CD8alpha-sufficient mice are better APCs compared with CD8alpha+ DCs from the same mice. These data show that freshly isolated lung DCs are phenotypically and functionally distinct, and that the isolation technique alters the biology of these cells. Therefore, lung DC phenotype and function must be interpreted relative to the technique used for isolation.
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Affiliation(s)
- Kena A Swanson
- Department of Microbiology and Immunology, Indiana University School of Medicine, Indianapolis 46202, USA
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47
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Engel J. Role of oligomerization domains in thrombospondins and other extracellular matrix proteins. Int J Biochem Cell Biol 2004; 36:997-1004. [PMID: 15094115 DOI: 10.1016/j.biocel.2003.12.009] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2003] [Revised: 12/23/2003] [Accepted: 12/29/2003] [Indexed: 10/26/2022]
Abstract
Coiled coils, collagen triple helices and globular oligomerization domains mediate the subunit assembly of many proteins in vertebrates and invertebrates. Oligomerization offers functional advantages including multivalency, increased binding strength and the combined function of different domains. These features are seen in natural proteins and may be introduced by protein engineering. The special focus of this review is on oligomerization domain of extracellular matrix proteins. For thrombospondins, initial interesting results on the functional role of oligomerization have been published. Other features remain to be explored. For example, it is not clear why thrombospondin-1 and thrombospondin-2 are trimers whereas thrombospondins-3 to -5 are pentamers. To stimulate this type of research, this review makes a survey of oligomerization domains and their functional role in extracellular matrix proteins.
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Affiliation(s)
- Jürgen Engel
- Department for Biophysical Chemistry, Biozentrum, University of Basel, Basel CH 4056, Switzerland.
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Buslepp J, Wang H, Biddison WE, Appella E, Collins EJ. A Correlation between TCR Vα Docking on MHC and CD8 Dependence. Immunity 2003; 19:595-606. [PMID: 14563323 DOI: 10.1016/s1074-7613(03)00269-3] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
T cell receptors (TCR) adopt a similar orientation when binding with major histocompatibility complex (MHC) molecules, yet the biological mechanism that generates this similar TCR orientation remains obscure. We show here the cocrystallographic structure of a mouse TCR bound to a human MHC molecule not seen by the TCR during thymic development. The orientation of this xenoreactive murine TCR atop human MHC deviates from the typical orientation more than any previously determined TCR/MHC structure. This unique orientation is solely due to the placement of the TCR Valpha domain on the MHC. In light of new information provided by this structure, we have reanalyzed the existing TCR/MHC cocrystal structures and discovered unique features of TCR Valpha domain position on class I MHC that correlate with CD8 dependence. Finally, we propose that the orientation seen in TCR recognition of MHC is a consequence of selection during T cell development.
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Affiliation(s)
- Jennifer Buslepp
- Department of Biochemistry and Biophysics, University of North Carolina, Chapel Hill, NC 27599, USA
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49
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Abstract
Over the past decade, key protein interactions contributing to T cell antigen recognition have been characterized in molecular detail. These have included interactions involving the T cell antigen receptor (TCR) itself, its coreceptors CD4 and CD8, the accessory molecule CD2, and the costimulatory receptors CD28 and CTLA-4. A clear view is emerging of how these molecules interact with their ligands at the cell-cell interface. Structural and binding studies have confirmed that the proteins span small but comparable distances and that, overall, they interact very weakly. However, there have been important surprises as well: that TCR interactions with peptide-MHC are topologically constrained and characterized by considerable conformational flexibility at the binding interface; that coreceptors engage peptide-MHC with extraordinarily fast kinetics and at angles apparently precluding direct interactions with the TCR bound to the same peptide-MHC; that the structural mechanisms allowing recognition by costimulatory and accessory molecules to be weak and yet specific are very heterogeneous; and that because of differences in both binding affinity and stoichiometry, there is enormous variation in the stability of the various costimulatory receptor/ligand complexes. These studies provide the necessary framework for exploring how these molecular interactions initiate T cell activation.
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50
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Merry AH, Gilbert RJC, Shore DA, Royle L, Miroshnychenko O, Vuong M, Wormald MR, Harvey DJ, Dwek RA, Classon BJ, Rudd PM, Davis SJ. O-glycan sialylation and the structure of the stalk-like region of the T cell co-receptor CD8. J Biol Chem 2003; 278:27119-28. [PMID: 12676960 DOI: 10.1074/jbc.m213056200] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Studies of mucins suggest that the structural effects of O-glycans are restricted to steric interactions between peptide-linked GalNAc residues and adjacent polypeptide residues. It has been proposed, however, that differential O-glycan sialylation alters the structure of the stalk-like region of the T cell co-receptor, CD8, and that this, in turn, modulates ligand binding (Daniels, M. A., Devine, L., Miller, J. D., Moser, J. M., Lukacher, A. E., Altman, J. D., Kavathas, P., Hogquist, K. A., and Jameson, S. C. (2001) Immunity 15, 1051-1061; Moody, A. M., Chui, D., Reche, P. A., Priatel, J. J., Marth, J. D., and Reinherz, E. L. (2001) Cell 107, 501-512). We characterize the glycosylation of soluble, chimeric forms of the alphaalpha- and alphabeta-isoforms of murine CD8 containing the O-glycosylated stalk of rat CD8alphaalpha, and we show that the stalk O-glycans are differentially sialylated in CHO K1 versus Lec3.2.8.1 cells (82 versus approximately 6%, respectively). Sedimentation analysis indicates that the Perrin functions, Pexp, which reflect overall molecular shape, are very similar (1.61 versus 1.54), whereas the sedimentation coefficients (s) of the CHO K1- and Lec3.2.8.1-derived proteins differ considerably (3.73 versus 3.13 S). The hydrodynamic properties of molecular models also strongly imply that the sialylated and non-sialylated forms of the chimera have parallel, equally highly extended stalks ( approximately 2.6 A/residue). Our analysis indicates that, as in the case of mucins, the overall structure of O-glycosylated stalk-like peptides is sialylation-independent and that the functional effects of differential CD8 O-glycan sialylation need careful interpretation.
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Affiliation(s)
- Anthony H Merry
- Oxford Glycobiology Institute, Department of Biochemistry, the University of Oxford, South Parks Road, Oxford OX1 3QU, United Kingdom
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