1
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Ming Q, Antfolk D, Price DA, Manturova A, Medina E, Singh S, Mason C, Tran TH, Smalley KSM, Leung DW, Luca VC. Structural basis for mouse LAG3 interactions with the MHC class II molecule I-A b. Nat Commun 2024; 15:7513. [PMID: 39209860 PMCID: PMC11362559 DOI: 10.1038/s41467-024-51930-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2024] [Accepted: 08/22/2024] [Indexed: 09/04/2024] Open
Abstract
The immune checkpoint protein, Lymphocyte activation gene-3 (LAG3), binds Major Histocompatibility Complex Class II (MHC-II) and suppresses T cell activation. Despite the recent FDA approval of a LAG3 inhibitor for the treatment of melanoma, how LAG3 engages MHC-II on the cell surface remains poorly understood. Here, we determine the 3.84 Å-resolution structure of mouse LAG3 bound to the MHC-II molecule I-Ab, revealing that domain 1 (D1) of LAG3 binds a conserved, membrane-proximal region of MHC-II spanning both the α2 and β2 subdomains. LAG3 dimerization restricts the intermolecular spacing of MHC-II molecules, which may attenuate T cell activation by enforcing suboptimal signaling geometry. The LAG3-MHC-II interface overlaps with the MHC-II-binding site of the T cell coreceptor CD4, implicating disruption of CD4-MHC-II interactions as a mechanism for LAG3 immunosuppressive function. Lastly, antibody epitope analysis indicates that multiple LAG3 inhibitors do not recognize the MHC-II-binding interface of LAG3, suggesting a role for functionally distinct mechanisms of LAG3 antagonism in therapeutic development.
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Affiliation(s)
- Qianqian Ming
- Moffitt Cancer Center and Research Institute, Department of Immunology, Tampa, FL, 33612, USA
| | - Daniel Antfolk
- Moffitt Cancer Center and Research Institute, Department of Immunology, Tampa, FL, 33612, USA
| | - David A Price
- Washington University School of Medicine, Department of Medicine, St. Louis, MO, 63110, USA
| | - Anna Manturova
- Moffitt Cancer Center and Research Institute, Department of Immunology, Tampa, FL, 33612, USA
| | - Elliot Medina
- Moffitt Cancer Center and Research Institute, Department of Immunology, Tampa, FL, 33612, USA
| | - Srishti Singh
- Moffitt Cancer Center and Research Institute, Department of Immunology, Tampa, FL, 33612, USA
| | - Charlotte Mason
- Moffitt Cancer Center and Research Institute, Department of Immunology, Tampa, FL, 33612, USA
| | - Timothy H Tran
- Moffitt Cancer Center and Research Institute, Chemical Biology Core, Tampa, FL, 33612, USA
| | - Keiran S M Smalley
- Moffitt Cancer Center and Research Institute, Department of Tumor Microenvironment and Metastasis, Tampa, FL, 33612, USA
| | - Daisy W Leung
- Washington University School of Medicine, Department of Medicine, St. Louis, MO, 63110, USA
| | - Vincent C Luca
- Moffitt Cancer Center and Research Institute, Department of Immunology, Tampa, FL, 33612, USA.
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2
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Omotoso MO, Lanis MR, Schneck JP. Artificial Antigen-Presenting Cell Fabrication for Murine T Cell Expansion. Curr Protoc 2024; 4:e976. [PMID: 38400601 PMCID: PMC11062398 DOI: 10.1002/cpz1.976] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2024]
Abstract
Antigen-presenting cells (APCs), such as dendritic cells and macrophages, have a unique ability to survey the body and present information to T cells via peptide-loaded major histocompatibility complexes (signal 1). This presentation, along with a co-stimulatory signal (signal 2), leads to activation and subsequent expansion of T cells. This process can be harnessed and utilized for therapeutic applications, but the use of patient-derived APCs can be complex and inefficient. Alternatively, artificial APCs (aAPCs) provide a simplified method to achieve T cell activation by presenting the two necessary stimulatory signals. This protocol describes the utilization of magnetic nanoparticles and stimulatory proteins to create aAPCs that can be employed for activating and expanding antigen-specific T cells for both basic and translational immunology and immunotherapy studies. © 2024 Wiley Periodicals LLC. Basic Protocol 1: Protein and particle modification for aAPC fabrication Basic Protocol 2: aAPC validation by immunolabeling of conjugated protein Support Protocol 1: Quantification of aAPC stock concentration Basic Protocol 3: Determination of aAPC usage for murine CD8+ T cell activation Support Protocol 2: Isolation of murine CD8+ T cells.
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Affiliation(s)
- Mary O. Omotoso
- Department of Biomedical Engineering, Johns Hopkins University School of Medicine, Baltimore, MD
- Departments of Pathology and Medicine, Johns Hopkins University School of Medicine, Baltimore, MD
| | - Mara R. Lanis
- Department of Biomedical Engineering, Johns Hopkins University School of Medicine, Baltimore, MD
- Departments of Pathology and Medicine, Johns Hopkins University School of Medicine, Baltimore, MD
| | - Jonathan P. Schneck
- Departments of Pathology and Medicine, Johns Hopkins University School of Medicine, Baltimore, MD
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3
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Tetraspanin-5-mediated MHC class I clustering is required for optimal CD8 T cell activation. Proc Natl Acad Sci U S A 2022; 119:e2122188119. [PMID: 36215490 PMCID: PMC9586303 DOI: 10.1073/pnas.2122188119] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
MHC molecules are not randomly distributed on the plasma membrane but instead are present in discrete nanoclusters. The mechanisms that control formation of MHC I nanoclusters and the importance of such structures are incompletely understood. Here, we report a molecular association between tetraspanin-5 (Tspan5) and MHC I molecules that started in the endoplasmic reticulum and was maintained on the plasma membrane. This association was observed both in mouse dendritic cells and in human cancer cell lines. Loss of Tspan5 reduced the size of MHC I clusters without affecting MHC I peptide loading, delivery of complexes to the plasma membrane, or overall surface MHC I levels. Functionally, CD8 T cell responses to antigen presented by Tspan5-deficient dendritic cells were impaired but were restored by antibody-induced reclustering of MHC I molecules. In contrast, Tspan5 did not associate with two other plasma membrane proteins, Flotillin1 and CD55, with or the endoplasmic reticulum proteins Tapasin and TAP. Thus, our findings identify a mechanism underlying the clustering of MHC I molecules that is important for optimal T cell responses.
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4
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Sahoo A, Mukherjee D, Mahata D, Mukherjee G. Peptide–MHC complexes: dressing up to manipulate T cells against autoimmunity and cancer. Immunotherapy 2022; 14:337-350. [PMID: 35152723 DOI: 10.2217/imt-2021-0230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Antigen-specificity of T cells provides important clues to the pathogenesis of T cell-mediated autoimmune diseases and immune-evasion strategies of tumors. Identification of T cell clones involved in autoimmunity or cancer is achieved with soluble peptide–MHC (pMHC) complex multimers. Importantly, these complexes can also be used to manipulate disease-relevant T cells to restore homeostasis of T cell-mediated immune response. While auto-antigen-specific T cells can be deleted or anergized by T cell receptor engagement with cognate pMHC complexes in the absence of costimulation, integration of these complexes in artificial antigen-presenting systems can activate tumor antigen-specific T cells. Here the authors discuss the advancements in pMHC-complex-mediated immunotherapeutic strategies in autoimmunity and cancer and identify the lacunae in these strategies that need to be addressed to facilitate clinical implementation.
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Affiliation(s)
- Arpita Sahoo
- School of Medical Science & Technology, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal, 721302, India
- Department of Biotechnology, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal, 721302, India
| | - Debangshu Mukherjee
- School of Medical Science & Technology, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal, 721302, India
| | - Dhrubajyoti Mahata
- School of Medical Science & Technology, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal, 721302, India
- School of Bioscience, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal, 721302, India
| | - Gayatri Mukherjee
- School of Medical Science & Technology, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal, 721302, India
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5
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Zhao X, Wu LZ, Ng EKY, Leow KWS, Wei Q, Gascoigne NRJ, Brzostek J. Non-Stimulatory pMHC Enhance CD8 T Cell Effector Functions by Recruiting Coreceptor-Bound Lck. Front Immunol 2021; 12:721722. [PMID: 34707605 PMCID: PMC8542885 DOI: 10.3389/fimmu.2021.721722] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Accepted: 09/20/2021] [Indexed: 11/17/2022] Open
Abstract
Under physiological conditions, CD8+ T cells need to recognize low numbers of antigenic pMHC class I complexes in the presence of a surplus of non-stimulatory, self pMHC class I on the surface of the APC. Non-stimulatory pMHC have been shown to enhance CD8+ T cell responses to low amounts of antigenic pMHC, in a phenomenon called co-agonism, but the physiological significance and molecular mechanism of this phenomenon are still poorly understood. Our data show that co-agonist pMHC class I complexes recruit CD8-bound Lck to the immune synapse to modulate CD8+ T cell signaling pathways, resulting in enhanced CD8+ T cell effector functions and proliferation, both in vitro and in vivo. Moreover, co-agonism can boost T cell proliferation through an extrinsic mechanism, with co-agonism primed CD8+ T cells enhancing Akt pathway activation and proliferation in neighboring CD8+ T cells primed with low amounts of antigen.
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Affiliation(s)
- Xiang Zhao
- Immunology Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore.,Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Liang-Zhe Wu
- Immunology Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore.,Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Esther K Y Ng
- Immunology Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore.,Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Kerisa W S Leow
- Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Qianru Wei
- Immunology Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore.,Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Nicholas R J Gascoigne
- Immunology Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore.,Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Joanna Brzostek
- Immunology Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore.,Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
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6
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Chang J. MHC multimer: A Molecular Toolbox for Immunologists. Mol Cells 2021; 44:328-334. [PMID: 33972472 PMCID: PMC8175149 DOI: 10.14348/molcells.2021.0052] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Revised: 03/25/2021] [Accepted: 03/25/2021] [Indexed: 12/12/2022] Open
Abstract
The advent of the major histocompatibility complex (MHC) multimer technology has led to a breakthrough in the quantification and analysis of antigen-specific T cells. In particular, this technology has dramatically advanced the measurement and analysis of CD8 T cells and is being applied more widely. In addition, the scope of application of MHC multimer technology is gradually expanding to other T cells such as CD4 T cells, natural killer T cells, and mucosal-associated invariant T cells. MHC multimer technology acts by complementing the T-cell receptor-MHC/peptide complex affinity, which is relatively low compared to antigen-antibody affinity, through a multivalent interaction. The application of MHC multimer technology has expanded to include various functions such as quantification and analysis of antigen-specific T cells, cell sorting, depletion, stimulation to replace antigen-presenting cells, and single-cell classification through DNA barcodes. This review aims to provide the latest knowledge of MHC multimer technology, which is constantly evolving, broaden understanding of this technology, and promote its widespread use.
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Affiliation(s)
- Jun Chang
- Graduate School of Pharmaceutical Sciences, Ewha Womans University, Seoul 03760, Korea
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7
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Li J, Wang L, Tian J, Zhou Z, Li J, Yang H. Nongenetic engineering strategies for regulating receptor oligomerization in living cells. Chem Soc Rev 2020; 49:1545-1568. [DOI: 10.1039/c9cs00473d] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Nongenetic strategies for regulating receptor oligomerization in living cells based on DNA, protein, small molecules and physical stimuli.
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Affiliation(s)
- Jingying Li
- MOE Key Laboratory for Analytical Science of Food Safety and Biology
- Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety
- State Key Laboratory of Photocatalysis on Energy and Environment
- College of Chemistry
- Fuzhou University
| | - Liping Wang
- MOE Key Laboratory for Analytical Science of Food Safety and Biology
- Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety
- State Key Laboratory of Photocatalysis on Energy and Environment
- College of Chemistry
- Fuzhou University
| | - Jinmiao Tian
- Institute of Molecular Medicine
- Renji Hospital
- School of Medicine
- Shanghai Jiao Tong University
- Shanghai
| | - Zhilan Zhou
- Institute of Molecular Medicine
- Renji Hospital
- School of Medicine
- Shanghai Jiao Tong University
- Shanghai
| | - Juan Li
- MOE Key Laboratory for Analytical Science of Food Safety and Biology
- Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety
- State Key Laboratory of Photocatalysis on Energy and Environment
- College of Chemistry
- Fuzhou University
| | - Huanghao Yang
- MOE Key Laboratory for Analytical Science of Food Safety and Biology
- Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety
- State Key Laboratory of Photocatalysis on Energy and Environment
- College of Chemistry
- Fuzhou University
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8
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Magnin M, Guillaume P, Coukos G, Harari A, Schmidt J. High-throughput identification of human antigen-specific CD8 + and CD4 + T cells using soluble pMHC multimers. Methods Enzymol 2019; 631:21-42. [PMID: 31948548 DOI: 10.1016/bs.mie.2019.05.019] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Peptide major histocompatibility complex (pMHC) multimers have been used since decades to identify, isolate and analyze antigen-specific T cells by flow (and more recently mass) cytometry. Yet well established as a standard technology, improvements are still required to face the growing needs of personalized immune monitoring. Here we review the latest developments about (i) the quality of pMHC class I and II monomers, (ii) the importance of the multimeric scaffold, (iii) the staining conditions and (iv) the high-throughput synthesis of pMHC monomers. Finally, innovative multiplexed, combinatorial strategies for parallel detection of antigen-specific T cells in a single sample are discussed.
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Affiliation(s)
- Morgane Magnin
- Ludwig Institute for Cancer Research, University of Lausanne, Lausanne, Switzerland; Department of Oncology, University Hospital of Lausanne, Lausanne, Switzerland
| | - Philippe Guillaume
- Ludwig Institute for Cancer Research, University of Lausanne, Lausanne, Switzerland; Department of Oncology, University Hospital of Lausanne, Lausanne, Switzerland
| | - George Coukos
- Ludwig Institute for Cancer Research, University of Lausanne, Lausanne, Switzerland; Department of Oncology, University Hospital of Lausanne, Lausanne, Switzerland.
| | - Alexandre Harari
- Ludwig Institute for Cancer Research, University of Lausanne, Lausanne, Switzerland; Department of Oncology, University Hospital of Lausanne, Lausanne, Switzerland
| | - Julien Schmidt
- Ludwig Institute for Cancer Research, University of Lausanne, Lausanne, Switzerland; Department of Oncology, University Hospital of Lausanne, Lausanne, Switzerland
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9
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Goyette J, Nieves DJ, Ma Y, Gaus K. How does T cell receptor clustering impact on signal transduction? J Cell Sci 2019; 132:132/4/jcs226423. [DOI: 10.1242/jcs.226423] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
ABSTRACT
The essential function of the T cell receptor (TCR) is to translate the engagement of peptides on the major histocompatibility complex (pMHC) into appropriate intracellular signals through the associated cluster of differentiation 3 (CD3) complex. The spatial organization of the TCR–CD3 complex in the membrane is thought to be a key regulatory element of signal transduction, raising the question of how receptor clustering impacts on TCR triggering. How signal transduction at the TCR–CD3 complex encodes the quality and quantity of pMHC molecules is not fully understood. This question can be approached by reconstituting T cell signaling in model and cell membranes and addressed by single-molecule imaging of endogenous proteins in T cells. We highlight such methods and further discuss how TCR clustering could affect pMHC rebinding rates, the local balance between kinase and phosphatase activity and/or the lipid environment to regulate the signal efficiency of the TCR–CD3 complex. We also examine whether clustering could affect the conformation of cytoplasmic CD3 tails through a biophysical mechanism. Taken together, we highlight how the spatial organization of the TCR–CD3 complex – addressed by reconstitution approaches – has emerged as a key regulatory element in signal transduction of this archetypal immune receptor.
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Affiliation(s)
- Jesse Goyette
- EMBL Australia Node in Single Molecule Science, University of New South Wales, Sydney 2052, Australia
- ARC Centre of Excellence in Advanced Molecular imaging, University of New South Wales, Sydney 2052, Australia
| | - Daniel J. Nieves
- EMBL Australia Node in Single Molecule Science, University of New South Wales, Sydney 2052, Australia
- ARC Centre of Excellence in Advanced Molecular imaging, University of New South Wales, Sydney 2052, Australia
| | - Yuanqing Ma
- EMBL Australia Node in Single Molecule Science, University of New South Wales, Sydney 2052, Australia
- ARC Centre of Excellence in Advanced Molecular imaging, University of New South Wales, Sydney 2052, Australia
| | - Katharina Gaus
- EMBL Australia Node in Single Molecule Science, University of New South Wales, Sydney 2052, Australia
- ARC Centre of Excellence in Advanced Molecular imaging, University of New South Wales, Sydney 2052, Australia
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10
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Zhao X, Sankaran S, Yap J, Too CT, Ho ZZ, Dolton G, Legut M, Ren EC, Sewell AK, Bertoletti A, MacAry PA, Brzostek J, Gascoigne NRJ. Nonstimulatory peptide-MHC enhances human T-cell antigen-specific responses by amplifying proximal TCR signaling. Nat Commun 2018; 9:2716. [PMID: 30006605 PMCID: PMC6045629 DOI: 10.1038/s41467-018-05288-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2017] [Accepted: 05/12/2018] [Indexed: 01/02/2023] Open
Abstract
Foreign antigens are presented by antigen-presenting cells in the presence of abundant endogenous peptides that are nonstimulatory to the T cell. In mouse T cells, endogenous, nonstimulatory peptides have been shown to enhance responses to specific peptide antigens, a phenomenon termed coagonism. However, whether coagonism also occurs in human T cells is unclear, and the molecular mechanism of coagonism is still under debate since CD4 and CD8 coagonism requires different interactions. Here we show that the nonstimulatory, HIV-derived peptide GAG enhances a specific human cytotoxic T lymphocyte response to HBV-derived epitopes presented by HLA-A*02:01. Coagonism in human T cells requires the CD8 coreceptor, but not T-cell receptor (TCR) binding to the nonstimulatory peptide–MHC. Coagonists enhance the phosphorylation and recruitment of several molecules involved in the TCR-proximal signaling pathway, suggesting that coagonists promote T-cell responses to antigenic pMHC by amplifying TCR-proximal signaling. Coagonism, the ability of nonstimulatory antigens to promote T-cell activation, has been reported in mice. Here the authors show that coagonism also occurs in human CD8 T cells, in which a nonstimulatory HIV GAG peptide enhances a specific T-cell response to a hepatitis B virus epitope by amplifying T-cell receptor signals.
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Affiliation(s)
- Xiang Zhao
- Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, 5 Science Drive 2, Singapore, 117545, Singapore
| | - Shvetha Sankaran
- Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, 5 Science Drive 2, Singapore, 117545, Singapore.,Immunology Programme, Life Sciences Institute, National University of Singapore, 28 Medical Drive, Centre for Life Sciences, Level 3, Singapore, 117456, Singapore
| | - Jiawei Yap
- Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, 5 Science Drive 2, Singapore, 117545, Singapore
| | - Chien Tei Too
- Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, 5 Science Drive 2, Singapore, 117545, Singapore.,Immunology Programme, Life Sciences Institute, National University of Singapore, 28 Medical Drive, Centre for Life Sciences, Level 3, Singapore, 117456, Singapore
| | - Zi Zong Ho
- Emerging Infectious Diseases Program, Duke-NUS Graduate Medical School, 8 College Road, Singapore, 169857, Singapore
| | - Garry Dolton
- Division of Infection and Immunity, Cardiff University School of Medicine, Henry Wellcome Building, University Hospital Wales, Heath Park, Cardiff, CF14 4XN, United Kingdom
| | - Mateusz Legut
- Division of Infection and Immunity, Cardiff University School of Medicine, Henry Wellcome Building, University Hospital Wales, Heath Park, Cardiff, CF14 4XN, United Kingdom
| | - Ee Chee Ren
- Singapore Immunology Network, A*STAR, 8A Biomedical Grove, Immunos #03-06, Singapore, 138648, Singapore
| | - Andrew K Sewell
- Division of Infection and Immunity, Cardiff University School of Medicine, Henry Wellcome Building, University Hospital Wales, Heath Park, Cardiff, CF14 4XN, United Kingdom.,Systems Immunity Research Institute, Cardiff University, Tenovus Building, Cardiff, CF14 4XN, United Kingdom
| | - Antonio Bertoletti
- Emerging Infectious Diseases Program, Duke-NUS Graduate Medical School, 8 College Road, Singapore, 169857, Singapore
| | - Paul A MacAry
- Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, 5 Science Drive 2, Singapore, 117545, Singapore.,Immunology Programme, Life Sciences Institute, National University of Singapore, 28 Medical Drive, Centre for Life Sciences, Level 3, Singapore, 117456, Singapore.,NUS Graduate School for Integrative Sciences and Engineering (NGS), National University of Singapore, Centre for Life Sciences (CeLS), #05-01, 28 Medical Drive, Singapore, 117456, Singapore
| | - Joanna Brzostek
- Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, 5 Science Drive 2, Singapore, 117545, Singapore.
| | - Nicholas R J Gascoigne
- Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, 5 Science Drive 2, Singapore, 117545, Singapore. .,Immunology Programme, Life Sciences Institute, National University of Singapore, 28 Medical Drive, Centre for Life Sciences, Level 3, Singapore, 117456, Singapore. .,NUS Graduate School for Integrative Sciences and Engineering (NGS), National University of Singapore, Centre for Life Sciences (CeLS), #05-01, 28 Medical Drive, Singapore, 117456, Singapore.
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11
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Balyan R, Gund R, Ebenezer C, Khalsa JK, Verghese DA, Krishnamurthy T, George A, Bal V, Rath S, Chaudhry A. Modulation of Naive CD8 T Cell Response Features by Ligand Density, Affinity, and Continued Signaling via Internalized TCRs. THE JOURNAL OF IMMUNOLOGY 2017; 198:1823-1837. [PMID: 28100678 DOI: 10.4049/jimmunol.1600083] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2016] [Accepted: 12/20/2016] [Indexed: 01/08/2023]
Abstract
T cell response magnitudes increase with increasing antigenic dosage. However, it is unclear whether ligand density only modulates the proportions of responding ligand-specific T cells or also alters responses at the single cell level. Using brief (3 h) exposure of TCR-transgenic mouse CD8 T cells in vitro to varying densities of cognate peptide-MHC ligand followed by ligand-free culture in IL-2, we found that ligand density determined the frequencies of responding cells but not the expression levels of the early activation marker molecule, CD69. Cells with low glucose uptake capacity and low protein synthesis rates were less ligand-sensitive, implicating metabolic competence in the response heterogeneity of CD8 T cell populations. Although most responding cells proliferated, ligand density was associated with time of entry into proliferation and with the extent of cell surface TCR downmodulation. TCR internalization was associated, regardless of the ligand density, with rapidity of c-myc induction, loss of the cell cycle inhibitor p27kip1, metabolic reprogramming, and cell cycle entry. A low affinity peptide ligand behaved, regardless of ligand density, like a low density, high affinity ligand in all these parameters. Inhibition of signaling after ligand exposure selectively delayed proliferation in cells with internalized TCRs. Finally, internalized TCRs continued to signal and genetic modification of TCR internalization and trafficking altered the duration of signaling in a T cell hybridoma. Together, our findings indicate that heterogeneity among responding CD8 T cell populations in their ability to respond to TCR-mediated stimulation and internalize TCRs mediates detection of ligand density or affinity, contributing to graded response magnitudes.
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Affiliation(s)
- Renu Balyan
- National Institute of Immunology, New Delhi 110067, India; and
| | - Rupali Gund
- National Institute of Immunology, New Delhi 110067, India; and
| | - Chitra Ebenezer
- National Institute of Immunology, New Delhi 110067, India; and
| | | | | | | | - Anna George
- National Institute of Immunology, New Delhi 110067, India; and
| | - Vineeta Bal
- National Institute of Immunology, New Delhi 110067, India; and
| | - Satyajit Rath
- National Institute of Immunology, New Delhi 110067, India; and
| | - Ashutosh Chaudhry
- National Institute of Immunology, New Delhi 110067, India; and.,Memorial Sloan Kettering Cancer Center, New York, NY 10065
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12
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Grandclément C, Pick H, Vogel H, Held W. NK Cells Respond to Haptens by the Activation of Calcium Permeable Plasma Membrane Channels. PLoS One 2016; 11:e0151031. [PMID: 26963818 PMCID: PMC4786276 DOI: 10.1371/journal.pone.0151031] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2015] [Accepted: 02/23/2016] [Indexed: 01/07/2023] Open
Abstract
Natural Killer (NK) cells mediate innate immunity to infected and transformed cells. Yet, NK cells can also mount hapten-specific recall responses thereby contributing to contact hypersensitivity (CHS). However, since NK cells lack antigen receptors that are used by the adaptive immune system to recognize haptens, it is not clear if NK cells respond directly to haptens and, if so, what mediates these responses. Here we show that among four haptens the two that are known to induce NK cell-dependent CHS trigger the rapid influx of extracellular Ca2+ into NK cells and lymphocyte cell lines. Thus lymphocytes can respond to haptens independent of antigen presentation and antigen receptors. We identify the Ca2+-permeable cation channel TRPC3 as a component of the lymphocyte response to one of these haptens. These data suggest that the response to the second hapten is based on a distinct mechanism, consistent with the capacity of NK cells to discriminate haptens. These findings raise the possibility that antigen-receptor independent activation of immune cells contributes to CHS.
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Affiliation(s)
- Camille Grandclément
- Ludwig Center for Cancer Research, Department of Oncology, University of Lausanne, Epalinges, Switzerland
| | - Horst Pick
- Laboratory of Physical Chemistry of Polymers and Membranes, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Horst Vogel
- Laboratory of Physical Chemistry of Polymers and Membranes, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Werner Held
- Ludwig Center for Cancer Research, Department of Oncology, University of Lausanne, Epalinges, Switzerland
- * E-mail:
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13
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Hebeisen M, Allard M, Gannon PO, Schmidt J, Speiser DE, Rufer N. Identifying Individual T Cell Receptors of Optimal Avidity for Tumor Antigens. Front Immunol 2015; 6:582. [PMID: 26635796 PMCID: PMC4649060 DOI: 10.3389/fimmu.2015.00582] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2015] [Accepted: 10/30/2015] [Indexed: 02/02/2023] Open
Abstract
Cytotoxic T cells recognize, via their T cell receptors (TCRs), small antigenic peptides presented by the major histocompatibility complex (pMHC) on the surface of professional antigen-presenting cells and infected or malignant cells. The efficiency of T cell triggering critically depends on TCR binding to cognate pMHC, i.e., the TCR–pMHC structural avidity. The binding and kinetic attributes of this interaction are key parameters for protective T cell-mediated immunity, with stronger TCR–pMHC interactions conferring superior T cell activation and responsiveness than weaker ones. However, high-avidity TCRs are not always available, particularly among self/tumor antigen-specific T cells, most of which are eliminated by central and peripheral deletion mechanisms. Consequently, systematic assessment of T cell avidity can greatly help distinguishing protective from non-protective T cells. Here, we review novel strategies to assess TCR–pMHC interaction kinetics, enabling the identification of the functionally most-relevant T cells. We also discuss the significance of these technologies in determining which cells within a naturally occurring polyclonal tumor-specific T cell response would offer the best clinical benefit for use in adoptive therapies, with or without T cell engineering.
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Affiliation(s)
- Michael Hebeisen
- Department of Oncology, Lausanne University Hospital Center (CHUV), University of Lausanne , Epalinges , Switzerland
| | - Mathilde Allard
- Department of Oncology, Lausanne University Hospital Center (CHUV), University of Lausanne , Epalinges , Switzerland
| | - Philippe O Gannon
- Department of Oncology, Lausanne University Hospital Center (CHUV), University of Lausanne , Epalinges , Switzerland
| | - Julien Schmidt
- Ludwig Center for Cancer Research, University of Lausanne , Epalinges , Switzerland ; TCMetrix Sàrl , Epalinges , Switzerland
| | - Daniel E Speiser
- Department of Oncology, Lausanne University Hospital Center (CHUV), University of Lausanne , Epalinges , Switzerland ; Ludwig Center for Cancer Research, University of Lausanne , Epalinges , Switzerland
| | - Nathalie Rufer
- Department of Oncology, Lausanne University Hospital Center (CHUV), University of Lausanne , Epalinges , Switzerland ; Ludwig Center for Cancer Research, University of Lausanne , Epalinges , Switzerland
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14
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Perica K, Kosmides AK, Schneck JP. Linking form to function: Biophysical aspects of artificial antigen presenting cell design. BIOCHIMICA ET BIOPHYSICA ACTA 2015; 1853:781-90. [PMID: 25200637 PMCID: PMC4344884 DOI: 10.1016/j.bbamcr.2014.09.001] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2014] [Revised: 08/15/2014] [Accepted: 09/01/2014] [Indexed: 12/22/2022]
Abstract
Artificial antigen presenting cells (aAPCs) are engineered platforms for T cell activation and expansion, synthesized by coupling T cell activating proteins to the surface of cell lines or biocompatible particles. They can serve both as model systems to study the basic aspects of T cell signaling and translationally as novel approaches for either active or adoptive immunotherapy. Historically, these reductionist systems have not been designed to mimic the temporally and spatially complex interactions observed during endogenous T cell-APC contact, which include receptor organization at both micro- and nanoscales and dynamic changes in cell and membrane morphologies. Here, we review how particle size and shape, as well as heterogenous distribution of T cell activating proteins on the particle surface, are critical aspects of aAPC design. In doing so, we demonstrate how insights derived from endogenous T cell activation can be applied to optimize aAPC, and in turn how aAPC platforms can be used to better understand endogenous T cell stimulation. This article is part of a Special Issue entitled: Nanoscale membrane organisation and signalling.
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Affiliation(s)
- Karlo Perica
- Department of Biomedical Engineering, Johns Hopkins School of Medicine, Baltimore, MD, USA; Institute of Cell Engineering, Johns Hopkins School of Medicine, Baltimore, MD, USA
| | - Alyssa K Kosmides
- Department of Biomedical Engineering, Johns Hopkins School of Medicine, Baltimore, MD, USA; Institute of Cell Engineering, Johns Hopkins School of Medicine, Baltimore, MD, USA
| | - Jonathan P Schneck
- Institute of Cell Engineering, Johns Hopkins School of Medicine, Baltimore, MD, USA; Department of Pathology, Johns Hopkins School of Medicine, Baltimore, MD, USA; Department of Oncology, Johns Hopkins School of Medicine, Baltimore, MD, USA; Department of Medicine, Johns Hopkins School of Medicine, Baltimore, MD, USA.
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15
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Progress in crystallization of major histocompatibility complex class I in vertebrates. CHINESE SCIENCE BULLETIN-CHINESE 2014. [DOI: 10.1007/s11434-014-0211-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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16
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Archer LD, Langford-Smith KJ, Bigger BW, Fildes JE. Mucopolysaccharide diseases: a complex interplay between neuroinflammation, microglial activation and adaptive immunity. J Inherit Metab Dis 2014; 37:1-12. [PMID: 23653226 DOI: 10.1007/s10545-013-9613-3] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/29/2012] [Accepted: 04/16/2013] [Indexed: 12/23/2022]
Abstract
Mucopolysaccharide (MPS) diseases are lysosomal storage disorders (LSDs) caused by deficiencies in enzymes required for glycosaminoglycan (GAG) catabolism. Mucopolysaccharidosis I (MPS I), MPS IIIA, MPS IIIB and MPS VII are deficient in the enzymes α-L-Iduronidase, Heparan-N-Sulphatase, N-Acetylglucosaminidase and Beta-Glucuronidase, respectively. Enzyme deficiency leads to the progressive multi-systemic build-up of heparan sulphate (HS) and dermatan sulphate (DS) within cellular lysosomes, followed by cell, tissue and organ damage and in particular neurodegeneration. Clinical manifestations of MPS are well established; however as lysosomes represent vital components of immune cells, it follows that lysosomal accumulation of GAGs could affect diverse immune functions and therefore influence disease pathogenesis. Theoretically, MPS neurodegeneration and GAGs could be substantiating a threat of danger and damage to alert the immune system for cellular clearance, which due to the progressive nature of MPS storage would propagate disease pathogenesis. Innate immunity appears to have a key role in MPS; however the extent of adaptive immune involvement remains to be elucidated. The current literature suggests a complex interplay between neuroinflammation, microglial activation and adaptive immunity in MPS disease.
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Affiliation(s)
- Louise D Archer
- The Transplant Centre, UHSM, University of Manchester, Manchester, England, UK
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17
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Schmidt J, Dojcinovic D, Guillaume P, Luescher I. Analysis, Isolation, and Activation of Antigen-Specific CD4(+) and CD8(+) T Cells by Soluble MHC-Peptide Complexes. Front Immunol 2013; 4:218. [PMID: 23908656 PMCID: PMC3726995 DOI: 10.3389/fimmu.2013.00218] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2013] [Accepted: 07/15/2013] [Indexed: 11/24/2022] Open
Abstract
T cells constitute the core of adaptive cellular immunity and protect higher organisms against pathogen infections and cancer. Monitoring of disease progression as well as prophylactic or therapeutic vaccines and immunotherapies call for conclusive detection, analysis, and sorting of antigen-specific T cells. This is possible by means of soluble recombinant ligands for T cells, i.e., MHC class I-peptide (pMHC I) complexes for CD8(+) T cells and MHC class II-peptide (pMHC II) complexes for CD4(+) T cells and flow cytometry. Here we review major developments in the development of pMHC staining reagents and their diverse applications and discuss perspectives of their use for basic and clinical investigations.
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Affiliation(s)
- Julien Schmidt
- Ludwig Center, University of Lausanne, Epalinges, Switzerland
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18
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Abstract
Using an elaborately evolved language of cytokines and chemokines as well as cell-cell interactions, the different components of the immune system communicate with each other and orchestrate a response (or wind one down). Immunological synapses are a key feature of the system in the ways in which they can facilitate and direct these responses. Studies analyzing the structure of an immune synapse as it forms between two cells have provided insight into how the stability and kinetics of this interaction ultimately affect the sensitivity, potency, and magnitude of a given response. Furthermore, we have gained an appreciation of how the immunological synapse provides directionality and contextual cues for downstream signaling and cellular decision-making. In this review, we discuss how using a variety of techniques, developed over the last decade, have allowed us to visualize and quantify key aspects of the dynamic synaptic interface and have furthered our understanding of their function. We describe some of the many characteristics of the immunological synapse that make it a vital part of intercellular communication and some of the questions that remain to be answered.
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Affiliation(s)
- Jianming Xie
- Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, CA, USA
| | - Cristina M. Tato
- Institute for Immunity, Transplantation and Infection, Stanford University School of Medicine, Stanford, CA, USA
| | - Mark M. Davis
- Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, CA, USA
- Institute for Immunity, Transplantation and Infection, Stanford University School of Medicine, Stanford, CA, USA
- The Howard Hughes Medical Institute, Stanford University School of Medicine, Stanford, CA, USA
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19
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Garbi N, Kreutzberg T. Dendritic cells enhance the antigen sensitivity of T cells. Front Immunol 2012; 3:389. [PMID: 23272004 PMCID: PMC3530030 DOI: 10.3389/fimmu.2012.00389] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2012] [Accepted: 12/04/2012] [Indexed: 11/13/2022] Open
Abstract
Naive T cells continuously migrate between the circulatory system and lymphoid organs, where they make dynamic contacts with rare dendritic cells (DCs) that strategically form an extensive dendrite network. In such a scenario, T cells spend most of their time quickly scanning the antigenic content of multiple DCs. These interactions provide the basis for efficient adaptive responses by increasing the probability of encounters between rare antigen-specific T cells and those DCs presenting the respective cognate antigens. In the absence of foreign antigen, however, T cells show different degrees of functional sensitivity toward TCR stimulation. Scanning of MHC/self-peptide complexes by naive T cells in the absence of infection is not without consequences but it increases their subsequent response toward antigenic challenge. This indicates that TCR sensitivity in naive T cells is tuned depending on the MHC/self-peptide signals they integrate from the environment even before T cells encounter cognate antigen. DCs have emerged as key components in providing MHC/self-peptide complexes and increasing the sensitivity of T cells toward subsequent TCR triggering. In the absence of cognate antigen, DCs maintain a tonic TCR signaling and license T cells for immune synapse (IS) maturation resulting in enhanced T cell responses toward a subsequent antigen stimulation. This review discusses recent findings on this subject and highlights the importance of the DC pool size for optimal T cell awareness to foreign antigen.
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Affiliation(s)
- Natalio Garbi
- Department of Molecular Immunology, Institutes of Molecular Medicine and Experimental Immunology, University of Bonn Bonn, Germany
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20
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Anikeeva N, Gakamsky D, Schøller J, Sykulev Y. Evidence that the density of self peptide-MHC ligands regulates T-cell receptor signaling. PLoS One 2012; 7:e41466. [PMID: 22870225 PMCID: PMC3411518 DOI: 10.1371/journal.pone.0041466] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2012] [Accepted: 06/21/2012] [Indexed: 11/24/2022] Open
Abstract
Noncognate or self peptide-MHC (pMHC) ligands productively interact with T-cell receptor (TCR) and are always in a large access over the cognate pMHC on the surface of antigen presenting cells. We assembled soluble cognate and noncognate pMHC class I (pMHC-I) ligands at designated ratios on various scaffolds into oligomers that mimic pMHC clustering and examined how multivalency and density of the pMHCs in model clusters influences the binding to live CD8 T cells and the kinetics of TCR signaling. Our data demonstrate that the density of self pMHC-I proteins promotes their interaction with CD8 co-receptor, which plays a critical role in recognition of a small number of cognate pMHC-I ligands. This suggests that MHC clustering on live target cells could be utilized as a sensitive mechanism to regulate T cell responsiveness.
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Affiliation(s)
- Nadia Anikeeva
- Department of Microbiology and Immunology and Kimmel Cancer Institute, Thomas Jefferson University, Philadelphia, Pennsylvania, United States of America
| | | | | | - Yuri Sykulev
- Department of Microbiology and Immunology and Kimmel Cancer Institute, Thomas Jefferson University, Philadelphia, Pennsylvania, United States of America
- * E-mail:
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21
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Xie J, Huppa JB, Newell EW, Huang J, Ebert PJR, Li QJ, Davis MM. Photocrosslinkable pMHC monomers stain T cells specifically and cause ligand-bound TCRs to be 'preferentially' transported to the cSMAC. Nat Immunol 2012; 13:674-80. [PMID: 22660579 PMCID: PMC3645478 DOI: 10.1038/ni.2344] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2012] [Accepted: 05/15/2012] [Indexed: 12/15/2022]
Abstract
The binding of T cell antigen receptors (TCRs) to specific complexes of peptide and major histocompatibility complex (pMHC) is typically of very low affinity, which necessitates the use of multimeric pMHC complexes to label T lymphocytes stably. We report here the development of pMHC complexes able to be crosslinked by ultraviolet irradiation; even as monomers, these efficiently and specifically stained cognate T cells. We also used this reagent to probe T cell activation and found that a covalently bound pMHC was more stimulatory than an agonist pMHC on lipid bilayers. This finding suggested that serial engagement of TCRs is dispensable for activation when a substantial fraction of TCRs are stably engaged. Finally, pMHC-bound TCRs were 'preferentially' transported into the central supramolecular activation cluster after activation, which suggested that ligand engagement enabled linkage of the TCR and its associated CD3 signaling molecules to the cytoskeleton.
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Affiliation(s)
- Jianming Xie
- Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, California, USA
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22
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Anikeeva N, Sykulev Y. Mechanisms controlling granule-mediated cytolytic activity of cytotoxic T lymphocytes. Immunol Res 2012; 51:183-94. [PMID: 22058021 DOI: 10.1007/s12026-011-8252-8] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Cytotoxic T lymphocytes (CTL) play a critical role in immunity against viruses and cancer. The antigen receptor or T-cell receptor (TCR) on CTL determines the specificity toward target cells. The CD8 co-receptor functions in concert with the TCR to enhance TCR-mediated signaling, accounting for the remarkable sensitivity and swift signaling kinetics of the CTL response. The latter ensures efficient delivery and release of lytic granules, resulting in sensitive and rapid destruction of target cells.
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Affiliation(s)
- Nadia Anikeeva
- Department of Microbiology and Immunology, Kimmel Cancer Center and Jefferson Vaccine Center, Thomas Jefferson University, Philadelphia, PA 19107, USA.
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23
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Towards multivalent CD1d ligands: synthesis and biological activity of homodimeric α-galactosyl ceramide analogues. Carbohydr Res 2012; 356:152-62. [PMID: 22445102 PMCID: PMC3413882 DOI: 10.1016/j.carres.2012.02.034] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2012] [Accepted: 02/28/2012] [Indexed: 11/21/2022]
Abstract
A library of dimeric CD1d ligands, containing two α-galactosyl ceramide (α-GalCer) units linked by spacers of varying lengths has been synthesised. The key dimerisation reactions were carried out via copper-catalysed click reactions between a 6"-azido-6"-deoxy-α-galactosyl ceramide derivative and various diynes. Each α-GalCer dimer was tested for its ability to stimulate iNKT cells.
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24
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Makhadiyeva D, Lam L, Moatari M, Vallance J, Zheng Y, Campbell EC, Powis SJ. MHC class I dimer formation by alteration of the cellular redox environment and induction of apoptosis. Immunology 2012; 135:133-9. [PMID: 22044191 PMCID: PMC3277715 DOI: 10.1111/j.1365-2567.2011.03518.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2011] [Revised: 09/30/2011] [Accepted: 10/04/2011] [Indexed: 12/24/2022] Open
Abstract
Many MHC class I molecules contain unpaired cysteine residues in their cytoplasmic tail domains, the function of which remains relatively uncharacterized. Recently, it has been shown that in the small secretory vesicles known as exosomes, fully folded MHC class I dimers can form through a disulphide bond between the cytoplasmic tail domain cysteines, induced by the low levels of glutathione in these extracellular vesicles. Here we address whether similar MHC class I dimers form in whole cells by alteration of the redox environment. Treatment of the HLA-B27-expressing Epstein-Barr virus-transformed B-cell line Jesthom, and the leukaemic T-cell line CEM transfected with HLA-B27 with the strong oxidant diamide, and the apoptosis-inducing and glutathione-depleting agents hydrogen peroxide and thimerosal, induced MHC class I dimers. Furthermore, induction of apoptosis by cross-linking FasR/CD95 on CEM cells with monoclonal antibody CH-11 also induced MHC class I dimers. As with exosomal MHC class I dimers, the formation of these structures on cells is controlled by the cysteine at position 325 in the cytoplasmic tail domain of HLA-B27. Therefore, the redox environment of cells intimately controls induction of MHC class I dimers, the formation of which may provide novel structures for recognition by the immune system.
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25
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Gascoigne NRJ, Casas J, Brzostek J, Rybakin V. Initiation of TCR phosphorylation and signal transduction. Front Immunol 2011; 2:72. [PMID: 22566861 PMCID: PMC3342367 DOI: 10.3389/fimmu.2011.00072] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2011] [Accepted: 11/21/2011] [Indexed: 01/14/2023] Open
Abstract
Recent data with CD8+ T cells show that the initial phase of T cell receptor (TCR) binding to MHC–peptide (MHCp) is quickly followed by a second, stronger, binding phase representing the binding of CD8 to the MHCp. This second phase requires signaling by a Src-family kinase such as Lck. These data point out two aspects of the initial stage of TCR signaling that have not yet been clearly resolved. Firstly, how and by which Src-family kinase, is the initial phosphorylation of CD3ζ accomplished, given that the Lck associated with the co-receptors (CD4 or CD8) is not yet available. Secondly, what is the mechanism by which the co-receptor is brought close to the bound TCR before the co-receptor binds to MHCp?
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Affiliation(s)
- Nicholas R J Gascoigne
- Department of Immunology and Microbial Science, The Scripps Research Institute La Jolla, CA, USA.
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26
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Cuendet MA, Zoete V, Michielin O. How T cell receptors interact with peptide-MHCs: A multiple steered molecular dynamics study. Proteins 2011; 79:3007-24. [DOI: 10.1002/prot.23104] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2010] [Revised: 05/18/2011] [Accepted: 05/20/2011] [Indexed: 12/11/2022]
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27
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Schrum AG, Gil D, Turka LA, Palmer E. Physical and functional bivalency observed among TCR/CD3 complexes isolated from primary T cells. THE JOURNAL OF IMMUNOLOGY 2011; 187:870-8. [PMID: 21666056 DOI: 10.4049/jimmunol.1100538] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Unlike BCR and secreted Ig, TCR expression is not thought to occur in a bivalent form. The conventional monovalent model of TCR/CD3 is supported by published studies of complexes solubilized in the detergent digitonin, in which bivalency was not observed. We revisited the issue of TCR valency by examining complexes isolated from primary αβ T cells after solubilization in digitonin. Using immunoprecipitation followed by flow cytometry, we unexpectedly observed TCR/CD3 complexes that contained two TCRs per complex. Standard anti-TCR Abs, being bivalent themselves, tended to bind with double occupancy to bivalent TCRs; this property masked the presence of the second TCR per complex in certain Ab binding assays, which may partially explain why previous data did not reveal these bivalent complexes. We also found that the prevalence of bivalency among fully assembled, mature TCR/CD3 complexes was sufficient to impact the functional performance of immunoprecipitated TCRs in binding antigenic peptide/MHC-Ig fusion proteins. Both TCR positions per bivalent complex required an Ag-specific TCR to effect optimal binding to these soluble ligands. Therefore, we conclude that in primary T cells, TCR/CD3 complexes can be found that are physically and functionally bivalent. The expression of bivalent TCR/CD3 complexes has implications regarding potential mechanisms by which Ag may trigger signaling. It also suggests the possibility that the potential for bivalent expression could represent a general feature of Ag receptors.
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Affiliation(s)
- Adam G Schrum
- Department of Immunology, Mayo Clinic College of Medicine, Rochester, MN 55905, USA.
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28
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Guillaume P, Baumgaertner P, Neff L, Rufer N, Wettstein P, Speiser DE, Luescher IF. Novel soluble HLA-A2/MELAN-A complexes selectively stain a differentiation defective subpopulation of CD8+ T cells in patients with melanoma. Int J Cancer 2010; 127:910-23. [PMID: 19998338 DOI: 10.1002/ijc.25099] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Multimeric MHC I-peptide complexes containing phycoerythrin-streptavidin are widely used to detect and investigate antigen-specific CD8+ (and CD4+) T cells. Because such reagents are heterogeneous, we compared their binding characteristics with those of monodisperse dimeric, tetrameric and octameric complexes containing linkers of variable length and flexibility on Melan-A-specific CD8+ T cell clones and peripheral blood mononuclear cells (PBMC) from HLA-A*0201(+) melanoma patients. Striking binding differences were observed for different defined A2/Melan-A(26-35) complexes on T cells depending on their differentiation stage. In particular, short dimeric but not octameric A2/Melan-A(26-35) complexes selectively and avidly stained incompletely differentiated effector-memory T cells clones and populations expressing CD27 and CD28 and low levels of cytolytic mediators (granzymes and perforin). This subpopulation was found in PBMC from all six melanoma patients analyzed and proliferated on peptide stimulation with only modest phenotypic changes. By contrast influenza matrix(58-66) -specific CD8+ PBMC from nine HLA-A*0201(+) healthy donors were efficiently stained by A2/Flu matrix(58-61) multimers, but not dimer and upon peptide stimulation proliferated and differentiated from memory into effector T cells. Thus PBMC from melanoma patients contain a differentiation defective sub-population of Melan-A-specific CD8+ T cells that can be selectively and efficiently stained by short dimeric A2/Melan- A(26-35) complexes, which makes them directly accessible for longitudinal monitoring and further investigation.
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Affiliation(s)
- Philippe Guillaume
- Ludwig Institute for Cancer Research, Lausanne Branch, University of Lausanne, Epalinges, Switzerland
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29
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Owen DM, Gaus K, Magee AI, Cebecauer M. Dynamic organization of lymphocyte plasma membrane: lessons from advanced imaging methods. Immunology 2010; 131:1-8. [PMID: 20646076 DOI: 10.1111/j.1365-2567.2010.03319.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Lipids and lipid domains are suggested to play an essential role in the heterogeneous organization of the plasma membrane in eukaryotic cells, including cells of the immune system. We summarize the results of advanced imaging and physical studies of membrane organization with special focus on the plasma membrane of lymphocytes. We provide a comprehensive up-to-date view on the existence of membrane lipid and protein clusters such as lipid rafts and suggest research directions to better understand these highly dynamic entities on the surface of immune cells.
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Affiliation(s)
- Dylan M Owen
- Centre for Vascular Research, University of New South Wales, Sydney, NSW, Australia
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30
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Sykulev Y. Changing separating distances between immune receptors as a sensitive mechanism regulating T-cell activation. SELF/NONSELF 2010; 1:67-68. [PMID: 21318086 PMCID: PMC3036166 DOI: 10.4161/self.1.1.10380] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2009] [Accepted: 10/21/2009] [Indexed: 11/19/2022]
Affiliation(s)
- Yuri Sykulev
- Department of Microbiology and Immunology and Kimmel Cancer Center; Thomas Jefferson University; Philadelphia, PA USA
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31
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Lipid order and molecular assemblies in the plasma membrane of eukaryotic cells. Biochem Soc Trans 2009; 37:1056-60. [PMID: 19754451 DOI: 10.1042/bst0371056] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Multimolecular assemblies on the plasma membrane exhibit dynamic nature and are often generated during the activation of eukaryotic cells. The role of lipids and their physical properties in helping to control the existence of these structures is discussed. Technological improvements for live cell imaging of membrane components are also reviewed.
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32
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Takada K, Jameson SC. Self-class I MHC molecules support survival of naive CD8 T cells, but depress their functional sensitivity through regulation of CD8 expression levels. ACTA ACUST UNITED AC 2009; 206:2253-69. [PMID: 19752186 PMCID: PMC2757867 DOI: 10.1084/jem.20082553] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Previous studies have suggested that naive CD8 T cells require self-peptide–major histocompatability complex (MHC) complexes for maintenance. However, interpretation of such studies is complicated because of the involvement of lymphopenic animals, as lymphopenia drastically alters naive T cell homeostasis and function. In this study, we explored naive CD8 T cell survival and function in nonlymphopenic conditions by using bone marrow chimeric donors and hosts in which class I MHC expression is absent or limited to radiosensitive versus radioresistant cells. We found that long-term survival of naive CD8 T cells (but not CD4 T cells) was impaired in the absence of class I MHC. However, distinct from this effect, class I MHC deprivation also enhanced naive CD8 T cell responsiveness to low-affinity (but not high-affinity) peptide–MHC ligands. We found that this improved sensitivity was a consequence of up-regulated CD8 levels, which was mediated through a transcriptional mechanism. Hence, our data suggest that, in a nonlymphopenic setting, self-class I MHC molecules support CD8 T cell survival, but that these interactions also attenuate naive T cell sensitivity by dynamic tuning of CD8 levels.
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Affiliation(s)
- Kensuke Takada
- Center for Immunology, Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, MN 55455, USA
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Bouquié R, Bonnin A, Bernardeau K, Khammari A, Dréno B, Jotereau F, Labarrière N, Lang F. A fast and efficient HLA multimer-based sorting procedure that induces little apoptosis to isolate clinical grade human tumor specific T lymphocytes. Cancer Immunol Immunother 2009; 58:553-66. [PMID: 18751701 PMCID: PMC11029847 DOI: 10.1007/s00262-008-0578-2] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2008] [Accepted: 08/12/2008] [Indexed: 12/01/2022]
Abstract
HLA multimers are now widely used to stain and sort CD8 T lymphocytes specific for epitopes from viral or tumoral antigens presented in an HLA class I context. However, the transfer of this technology to a clinical setting to obtain clinical grade CD8 T lymphocytes that may be used in adoptive cell transfer (ACT) is hindered by two main obstacles: the first obstacle is the use of streptavidin or derived products that are not available in clinical grade to multimerize HLA/peptide monomers and the second is the reported high degree of apoptosis that eventually occurs when T cell receptors are crosslinked by HLA multimers. In the present report, we describe new HLA multimers composed of immunomagnetic beads covalently coupled to a mAb specific for the AviTag peptide and coated with HLA/peptide monomers bearing the non biotinylated AviTag at the COOH terminus of the HLA heavy chain. Thus, all the components of this new reagent can be obtained in clinical grade. We compared these new multimers with the previously described multimers made with streptavidin beads coated with biotinylated HLA/peptide monomers, in terms of sorting efficiency, recovery of functional T cells, apoptosis and activation. We provide evidence that the new multimers could very efficiently sort pure populations of T lymphocytes specific for three different melanoma antigens (Melan-A, gp100 and NA17-A) after a single peptide stimulation of melanoma patients' PBMC. The recovered specific T cells were cytotoxic against the relevant melanoma cell-lines and, in most cases, produced cytokines. In addition, in marked contrast with streptavidin-based multimers, our new multimers induced very little apoptosis or activation after binding specific T lymphocytes. Altogether, these new multimers fulfill all the necessary requirements to select clinical grade T lymphocytes and should facilitate the development of ACT protocols in cancer patients.
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Affiliation(s)
- Régis Bouquié
- INSERM U892, 9 quai Moncousu, 44093 Nantes Cedex 1, France
| | | | | | - Amir Khammari
- CHU of Nantes, Unit of Skin Cancer, 44093 Nantes, France
| | - Brigitte Dréno
- INSERM U892, 9 quai Moncousu, 44093 Nantes Cedex 1, France
- CHU of Nantes, Unit of Skin Cancer, 44093 Nantes, France
| | - Francine Jotereau
- INSERM U892, 9 quai Moncousu, 44093 Nantes Cedex 1, France
- Faculté des Sciences, Université de Nantes, 44322 Nantes, France
| | | | - François Lang
- INSERM U892, 9 quai Moncousu, 44093 Nantes Cedex 1, France
- UFR des Sciences Pharmaceutiques, Université de Nantes, 44322 Nantes, France
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35
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Protein-protein interaction investigated by steered molecular dynamics: the TCR-pMHC complex. Biophys J 2008; 95:3575-90. [PMID: 18621828 DOI: 10.1529/biophysj.108.131383] [Citation(s) in RCA: 89] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
We present a novel steered molecular dynamics scheme to induce the dissociation of large protein-protein complexes. We apply this scheme to study the interaction of a T cell receptor (TCR) with a major histocompatibility complex (MHC) presenting a peptide (p). Two TCR-pMHC complexes are considered, which only differ by the mutation of a single amino acid on the peptide; one is a strong agonist that produces T cell activation in vivo, while the other is an antagonist. We investigate the interaction mechanism from a large number of unbinding trajectories by analyzing van der Waals and electrostatic interactions and by computing energy changes in proteins and solvent. In addition, dissociation potentials of mean force are calculated with the Jarzynski identity, using an averaging method developed for our steering scheme. We analyze the convergence of the Jarzynski exponential average, which is hampered by the large amount of dissipative work involved and the complexity of the system. The resulting dissociation free energies largely underestimate experimental values, but the simulations are able to clearly differentiate between wild-type and mutated TCR-pMHC and give insights into the dissociation mechanism.
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36
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Segura JM, Guillaume P, Mark S, Dojcinovic D, Johannsen A, Bosshard G, Angelov G, Legler DF, Vogel H, Luescher IF. Increased mobility of major histocompatibility complex I-peptide complexes decreases the sensitivity of antigen recognition. J Biol Chem 2008; 283:24254-63. [PMID: 18579518 DOI: 10.1074/jbc.m803549200] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
CD8(+) cytotoxic T lymphocytes (CTL) can recognize and kill target cells expressing only a few cognate major histocompatibility complex (MHC) I-peptide complexes. This high sensitivity requires efficient scanning of a vast number of highly diverse MHC I-peptide complexes by the T cell receptor in the contact site of transient conjugates formed mainly by nonspecific interactions of ICAM-1 and LFA-1. Tracking of single H-2K(d) molecules loaded with fluorescent peptides on target cells and nascent conjugates with CTL showed dynamic transitions between states of free diffusion and immobility. The immobilizations were explained by association of MHC I-peptide complexes with ICAM-1 and strongly increased their local concentration in cell adhesion sites and hence their scanning by T cell receptor. In nascent immunological synapses cognate complexes became immobile, whereas noncognate ones diffused out again. Interfering with this mobility modulation-based concentration and sorting of MHC I-peptide complexes strongly impaired the sensitivity of antigen recognition by CTL, demonstrating that it constitutes a new basic aspect of antigen presentation by MHC I molecules.
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Affiliation(s)
- Jean-Manuel Segura
- Ludwig Institute for Cancer Research, Lausanne Branch, University of Lausanne, CH-1066 Epalinges, Switzerland
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37
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A permissive geometry model for TCR–CD3 activation. Trends Biochem Sci 2008; 33:51-7. [DOI: 10.1016/j.tibs.2007.10.008] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2007] [Revised: 10/09/2007] [Accepted: 10/19/2007] [Indexed: 01/23/2023]
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38
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Deng L, Mariuzza RA. Recognition of self-peptide-MHC complexes by autoimmune T-cell receptors. Trends Biochem Sci 2007; 32:500-8. [PMID: 17950605 DOI: 10.1016/j.tibs.2007.08.007] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2007] [Revised: 08/08/2007] [Accepted: 08/13/2007] [Indexed: 10/22/2022]
Abstract
T cell receptors (TCR) recognize antigenic peptides displayed by MHC molecules. Whereas T-cell recognition of foreign peptides is essential for immune defense against microbial pathogens, recognition of self-peptides can cause autoimmune disease. Structural studies of anti-foreign TCR showed remarkable similarities in the topology of TCR binding to peptide-MHC, which maximize interactions with the ligand. However, recent structures involving autoimmune and tumor-specific TCR have revealed that they engage self-peptide-MHC with different topologies, which are suboptimal for TCR binding. These differences might reflect the distinct selection pressures exerted on anti-microbial versus autoreactive T cells. The structures also provide new insights into TCR cross-reactivity, which can contribute to autoimmunity by increasing the likelihood of self-peptide-MHC recognition.
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Affiliation(s)
- Lu Deng
- Center for Advanced Research in Biotechnology, W.M. Keck Laboratory for Structural Biology, University of Maryland Biotechnology Institute, Rockville, MD 20850, USA
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39
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Naeher D, Daniels MA, Hausmann B, Guillaume P, Luescher I, Palmer E. A constant affinity threshold for T cell tolerance. ACTA ACUST UNITED AC 2007; 204:2553-9. [PMID: 17938233 PMCID: PMC2118488 DOI: 10.1084/jem.20070254] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
T cell tolerance depends on the T cell receptor's affinity for peptide/major histocompatibility complex (MHC) ligand; this critical parameter determines whether a thymocyte will be included (positive selection) or excluded (negative selection) from the T cell repertoire. A quantitative analysis of ligand binding was performed using an experimental system permitting receptor–coreceptor interactions on live cells under physiological conditions. Using three transgenic mouse strains expressing distinct class I MHC–restricted T cell receptors, we determined the affinity that defines the threshold for negative selection. The affinity threshold for self-tolerance appears to be a constant for cytotoxic T lymphocytes.
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Affiliation(s)
- Dieter Naeher
- Laboratory of Transplantation Immunology, Department of Research, University Hospital, 4031 Basel, Switzerland
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40
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Abstract
In light of recent data showing that both helper and cytotoxic T cells can detect even a single molecule of an agonist peptide-MHC, alphabeta T cells are clearly a type of sensory cell, comparable to any in the nervous system. In addition, endogenous (self) peptides bound to MHCs are not just important for thymic selection, but also play an integral role in T cell activation in the response to foreign antigens. With the multitude of specificities available to most T cells, they can thus be considered as a sensory organ, trained on self-peptide-MHCs and primed to detect nonself.
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Affiliation(s)
- Mark M Davis
- Howard Hughes Medical Institute, Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, California 94305, USA.
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41
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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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42
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Deng L, Langley RJ, Brown PH, Xu G, Teng L, Wang Q, Gonzales MI, Callender GG, Nishimura MI, Topalian SL, Mariuzza RA. Structural basis for the recognition of mutant self by a tumor-specific, MHC class II-restricted T cell receptor. Nat Immunol 2007; 8:398-408. [PMID: 17334368 DOI: 10.1038/ni1447] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2006] [Accepted: 02/05/2007] [Indexed: 12/23/2022]
Abstract
Structural studies of complexes of T cell receptor (TCR) and peptide-major histocompatibility complex (MHC) have focused on TCRs specific for foreign antigens or native self. An unexplored category of TCRs includes those specific for self determinants bearing alterations resulting from disease, notably cancer. We determined here the structure of a human melanoma-specific TCR (E8) bound to the MHC molecule HLA-DR1 and an epitope from mutant triosephosphate isomerase. The structure had features intermediate between 'anti-foreign' and autoimmune TCR-peptide-MHC class II complexes that may reflect the hybrid nature of altered self. E8 manifested very low affinity for mutant triosephosphate isomerase-HLA-DR1 despite the highly tumor-reactive properties of E8 cells. A second TCR (G4) had even lower affinity but underwent peptide-specific formation of dimers, suggesting this as a mechanism for enhancing low-affinity TCR-peptide-MHC interactions for T cell activation.
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Affiliation(s)
- Lu Deng
- Center for Advanced Research in Biotechnology, WM Keck Laboratory for Structural Biology, University of Maryland Biotechnology Institute, Rockville, Maryland 20850, USA
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43
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Rowbotham NJ, Hager-Theodorides AL, Cebecauer M, Shah DK, Drakopoulou E, Dyson J, Outram SV, Crompton T. Activation of the Hedgehog signaling pathway in T-lineage cells inhibits TCR repertoire selection in the thymus and peripheral T-cell activation. Blood 2007; 109:3757-66. [PMID: 17227833 PMCID: PMC1874579 DOI: 10.1182/blood-2006-07-037655] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
TCR signal strength is involved in many cell fate decisions in the T-cell lineage. Here, we show that transcriptional events induced by Hedgehog (Hh) signaling reduced TCR signal strength in mice. Activation of Hh signaling in thymocytes in vivo by expression of a transgenic transcriptional-activator form of Gli2 (Gli2DeltaN(2)) changed the outcome of TCR ligation at many stages of thymocyte development, allowing self-reactive cells to escape clonal deletion; reducing transgenic TCR-mediated positive selection; reducing the ratio of CD4/CD8 single-positive (SP) cells; and reducing cell surface CD5 expression. In contrast, in the Shh(-/-) thymus the ratio of CD4/CD8 cells and both positive and negative selection of a transgenic TCR were increased, demonstrating that Shh does indeed influence TCR repertoire selection and the transition from double-positive (DP) to SP cell in a physiological situation. In peripheral T cells, Gli2DeltaN(2) expression attenuated T-cell activation and proliferation, by a mechanism upstream of ERK phosphorylation.
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Affiliation(s)
- Nicola J Rowbotham
- Division of Cell and Molecular Biology, Imperial College London, South Kensington Campus, London, UK
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44
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Minguet S, Swamy M, Alarcón B, Luescher IF, Schamel WWA. Full Activation of the T Cell Receptor Requires Both Clustering and Conformational Changes at CD3. Immunity 2007; 26:43-54. [PMID: 17188005 DOI: 10.1016/j.immuni.2006.10.019] [Citation(s) in RCA: 192] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2006] [Revised: 10/10/2006] [Accepted: 10/27/2006] [Indexed: 11/26/2022]
Abstract
T cell receptor (TCR-CD3) triggering involves both receptor clustering and conformational changes at the cytoplasmic tails of the CD3 subunits. The mechanism by which TCRalphabeta ligand binding confers conformational changes to CD3 is unknown. By using well-defined ligands, we showed that induction of the conformational change requires both multivalent engagement and the mobility restriction of the TCR-CD3 imposed by the plasma membrane. The conformational change is elicited by cooperative rearrangements of two TCR-CD3 complexes and does not require accompanying changes in the structure of the TCRalphabeta ectodomains. This conformational change at CD3 reverts upon ligand dissociation and is required for T cell activation. Thus, our permissive geometry model provides a molecular mechanism that rationalizes how the information of ligand binding to TCRalphabeta is transmitted to the CD3 subunits and to the intracellular signaling machinery.
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Affiliation(s)
- Susana Minguet
- Max Planck-Institut für Immunbiologie and Faculty of Biology, University of Freiburg, Stübeweg 51, 79108 Freiburg, Germany
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45
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Anikeeva N, Lebedeva T, Clapp AR, Goldman ER, Dustin ML, Mattoussi H, Sykulev Y. Quantum dot/peptide-MHC biosensors reveal strong CD8-dependent cooperation between self and viral antigens that augment the T cell response. Proc Natl Acad Sci U S A 2006; 103:16846-51. [PMID: 17077145 PMCID: PMC1636542 DOI: 10.1073/pnas.0607771103] [Citation(s) in RCA: 88] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Cytotoxic T lymphocytes (CTL) can respond to a few viral peptide-MHC-I (pMHC-I) complexes among a myriad of virus-unrelated endogenous self pMHC-I complexes displayed on virus-infected cells. To elucidate the molecular recognition events on live CTL, we have utilized a self-assembled biosensor composed of semiconductor nanocrystals, quantum dots, carrying a controlled number of virus-derived (cognate) and other (noncognate) pMHC-I complexes and examined their recognition by antigen-specific T cell receptor (TCR) on anti-virus CD8(+) T cells. The unique architecture of nanoscale quantum dot/pMHC-I conjugates revealed that unexpectedly strong multivalent CD8-MHC-I interactions underlie the cooperative contribution of noncognate pMHC-I to the recognition of cognate pMHC-I by TCR to augment T cell responses. The cooperative, CD8-dependent spread of signal from a few productively engaged TCR to many other TCR can explain the remarkable ability of CTL to respond to virus-infected cells that present few cognate pMHC-I complexes.
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Affiliation(s)
- Nadia Anikeeva
- *Department of Microbiology and Immunology and Kimmel Cancer Institute, Thomas Jefferson University, Philadelphia, PA 19107
| | - Tatiana Lebedeva
- *Department of Microbiology and Immunology and Kimmel Cancer Institute, Thomas Jefferson University, Philadelphia, PA 19107
| | - Aaron R. Clapp
- U.S. Naval Research Laboratory, Optical Sciences Division, and Center for Bio/Molecular Science and Engineering, Washington, DC 20375; and
| | - Ellen R. Goldman
- U.S. Naval Research Laboratory, Optical Sciences Division, and Center for Bio/Molecular Science and Engineering, Washington, DC 20375; and
| | - Michael L. Dustin
- Skirball Institute of Biomolecular Medicine, New York University School of Medicine, New York, NY 10016
| | - Hedi Mattoussi
- U.S. Naval Research Laboratory, Optical Sciences Division, and Center for Bio/Molecular Science and Engineering, Washington, DC 20375; and
- To whom correspondence may be addressed. E-mail:
or
| | - Yuri Sykulev
- *Department of Microbiology and Immunology and Kimmel Cancer Institute, Thomas Jefferson University, Philadelphia, PA 19107
- To whom correspondence may be addressed. E-mail:
or
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46
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Guillaume P, Baumgaertner P, Angelov GS, Speiser D, Luescher IF. Fluorescence-activated cell sorting and cloning of bona fide CD8+ CTL with reversible MHC-peptide and antibody Fab' conjugates. THE JOURNAL OF IMMUNOLOGY 2006; 177:3903-12. [PMID: 16951353 DOI: 10.4049/jimmunol.177.6.3903] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The isolation of subsets of Ag-specific T cells for in vitro and in vivo studies by FACS is compromised by the fact that the soluble MHC-peptide complexes and Abs used for staining, especially when combined, induce unwanted T cell activation and eventually apoptosis. This is especially a problem for CD8+ CTL, which are susceptible to activation-dependent cell death. In this study, we show that reversible MHC-peptide complexes (tetramers) can be prepared by conjugating MHC-peptide monomers with desthiobiotin (DTB; also called dethiobiotin) and multimerization by reaction with fluorescent streptavidin. While in the cold these reagents are stable and allow good staining, they rapidly dissociate in monomers at elevated temperatures, especially in the presence of free biotin. FACS cloning of Melan-A (MART-1)-specific CTL from a melanoma-infiltrated lymph node with reversible HLA-A2 Melan-A26-35 multimers yielded over two times more clones than when using the conventional biotin-containing multimers. CTL clones obtained by means of reversible multimers killed Melan-A-positive tumor cells more efficiently as compared with clones obtained with the stable multimers. Among the CTL obtained with the reversible multimers, but much less among those obtained with the stable multimers, a high proportion of clones exhibited high functional and physical avidity and died upon incubation with soluble MHC-peptide complexes. Finally, we show that Fab' of an anti-CD8 Ab can be converted in reversible DTB streptavidin conjugates the same way. These DTB reagents efficiently and reversibly stained murine and human CTL without affecting their viability.
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Affiliation(s)
- Philippe Guillaume
- Ludwig Institute for Cancer Research, Lausanne Branch, University of Lausanne, Epalinges, Switzerland
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47
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Angelov GS, Guillaume P, Cebecauer M, Bosshard G, Dojcinovic D, Baumgaertner P, Luescher IF. Soluble MHC-peptide complexes containing long rigid linkers abolish CTL-mediated cytotoxicity. THE JOURNAL OF IMMUNOLOGY 2006; 176:3356-65. [PMID: 16517703 DOI: 10.4049/jimmunol.176.6.3356] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Soluble MHC-peptide (pMHC) complexes induce intracellular calcium mobilization, diverse phosphorylation events, and death of CD8+ CTL, given that they are at least dimeric and co-engage CD8. By testing dimeric, tetrameric, and octameric pMHC complexes containing spacers of different lengths, we show that their ability to activate CTL decreases as the distance between their subunit MHC complexes increases. Remarkably, pMHC complexes containing long rigid polyproline spacers (> or =80 A) inhibit target cell killing by cloned S14 CTL in a dose- and valence-dependent manner. Long octameric pMHC complexes abolished target cell lysis, even very strong lysis, at nanomolar concentrations. By contrast, an altered peptide ligand antagonist was only weakly inhibitory and only at high concentrations. Long D(b)-gp33 complexes strongly and specifically inhibited the D(b)-restricted lymphocytic choriomeningitis virus CTL response in vitro and in vivo. We show that complications related to transfer of peptide from soluble to cell-associated MHC molecules can be circumvented by using covalent pMHC complexes. Long pMHC complexes efficiently inhibited CTL target cell conjugate formation by interfering with TCR-mediated activation of LFA-1. Such reagents provide a new and powerful means to inhibit Ag-specific CTL responses and hence should be useful to blunt autoimmune disorders such as diabetes type I.
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Affiliation(s)
- Georgi S Angelov
- Ludwig Institute for Cancer Research, Lausanne Branch, University of Lausanne, 1066 Epalinges, Switzerland
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