1
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Clark M, Kroger CJ, Ke Q, Tisch RM. The Role of T Cell Receptor Signaling in the Development of Type 1 Diabetes. Front Immunol 2021; 11:615371. [PMID: 33603744 PMCID: PMC7884625 DOI: 10.3389/fimmu.2020.615371] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Accepted: 12/15/2020] [Indexed: 12/15/2022] Open
Abstract
T cell receptor (TCR) signaling influences multiple aspects of CD4+ and CD8+ T cell immunobiology including thymic development, peripheral homeostasis, effector subset differentiation/function, and memory formation. Additional T cell signaling cues triggered by co-stimulatory molecules and cytokines also affect TCR signaling duration, as well as accessory pathways that further shape a T cell response. Type 1 diabetes (T1D) is a T cell-driven autoimmune disease targeting the insulin producing β cells in the pancreas. Evidence indicates that dysregulated TCR signaling events in T1D impact the efficacy of central and peripheral tolerance-inducing mechanisms. In this review, we will discuss how the strength and nature of TCR signaling events influence the development of self-reactive T cells and drive the progression of T1D through effects on T cell gene expression, lineage commitment, and maintenance of pathogenic anti-self T cell effector function.
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Affiliation(s)
- Matthew Clark
- Department of Microbiology and Immunology, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States.,Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States
| | - Charles J Kroger
- Department of Microbiology and Immunology, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States.,Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States
| | - Qi Ke
- Department of Microbiology and Immunology, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States.,Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States
| | - Roland M Tisch
- Department of Microbiology and Immunology, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States.,Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States
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2
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Kolawole EM, Lamb TJ, Evavold BD. Relationship of 2D Affinity to T Cell Functional Outcomes. Int J Mol Sci 2020; 21:E7969. [PMID: 33120989 PMCID: PMC7662510 DOI: 10.3390/ijms21217969] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Revised: 10/14/2020] [Accepted: 10/23/2020] [Indexed: 12/11/2022] Open
Abstract
T cells are critical for a functioning adaptive immune response and a strong correlation exists between T cell responses and T cell receptor (TCR): peptide-loaded MHC (pMHC) binding. Studies that utilize pMHC tetramer, multimers, and assays of three-dimensional (3D) affinity have provided advancements in our understanding of T cell responses across different diseases. However, these technologies focus on higher affinity and avidity T cells while missing the lower affinity responders. Lower affinity TCRs in expanded polyclonal populations almost always constitute a significant proportion of the response with cells mediating different effector functions associated with variation in the proportion of high and low affinity T cells. Since lower affinity T cells expand and are functional, a fully inclusive view of T cell responses is required to accurately interpret the role of affinity for adaptive T cell immunity. For example, low affinity T cells are capable of inducing autoimmune disease and T cells with an intermediate affinity have been shown to exhibit an optimal anti-tumor response. Here, we focus on how affinity of the TCR may relate to T cell phenotype and provide examples where 2D affinity influences functional outcomes.
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Affiliation(s)
| | | | - Brian D. Evavold
- Department of Pathology, University of Utah, 15 N Medical Drive, Salt Lake City, UT 84112, USA; (E.M.K.); (T.J.L.)
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3
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Kolawole EM, Andargachew R, Liu B, Jacobs JR, Evavold BD. 2D Kinetic Analysis of TCR and CD8 Coreceptor for LCMV GP33 Epitopes. Front Immunol 2018; 9:2348. [PMID: 30374353 PMCID: PMC6197077 DOI: 10.3389/fimmu.2018.02348] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2018] [Accepted: 09/21/2018] [Indexed: 11/13/2022] Open
Abstract
The LCMV GP33 CD8 epitope has long been one of the most widely used antigens in viral immunology. Of note, almost all of the in vitro analyses of CD8 T cell responses to this epitope make use of an altered peptide ligand (APL) in which the cysteine from the original 9-mer peptide (KAVYNFATC) is substituted by a methionine at position 41 (KAVYNFATM). In addition, it is possible that the antigen processed during natural LCMV infection is an 11-mer peptide (KAVYNFATCGI) rather than the widely used 9-mer. Although previous affinity measurements using purified proteins for these antigen variants revealed minimal differences, we applied highly sensitive two dimensional (2D) biophysical based techniques to further dissect TCR interaction with these closely related GP33 variants. The kinetic analyses of affinity provided by the 2D micropipette adhesion frequency assay (2D-MP) and bond lifetime under force analyzed using a biomembrane force probe (BFP) revealed significant differences between 41M, 41C and the 11-mer 41CGI antigen. We found a hierarchy in 2D affinity as 41M peptide displayed augmented TCR 2D affinity compared to 41C and 41CGI. These differences were also maintained in the presence of CD8 coreceptor and when analysis of total TCR:pMHC and CD8:pMHC bonds were considered. Moreover, the three ligands displayed dramatic differences in the bond lifetimes generated under force, in particular the 41CGI variant with the lowest 2D affinity demonstrated a 15-fold synergistic contribution of the CD8 coreceptor to overall bond lifetime. Our analyses emphasize the sensitivity of single cell and single bond 2D kinetic measurements in distinguishing between related agonist peptides.
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Affiliation(s)
- Elizabeth M Kolawole
- Department of Pathology, Microbiology and Immunology, University of Utah, Salt Lake City, UT, United States
| | - Rakieb Andargachew
- Department of Microbiology and Immunology, Emory University, Atlanta, GA, United States
| | - Baoyu Liu
- Department of Pathology, Microbiology and Immunology, University of Utah, Salt Lake City, UT, United States
| | - Jesica R Jacobs
- Department of Pathology, Microbiology and Immunology, University of Utah, Salt Lake City, UT, United States
| | - Brian D Evavold
- Department of Pathology, Microbiology and Immunology, University of Utah, Salt Lake City, UT, United States
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4
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Blanchfield L, Sabatino JJ, Lawrence L, Evavold BD. NFM Cross-Reactivity to MOG Does Not Expand a Critical Threshold Level of High-Affinity T Cells Necessary for Onset of Demyelinating Disease. THE JOURNAL OF IMMUNOLOGY 2017; 199:2680-2691. [PMID: 28887429 DOI: 10.4049/jimmunol.1700792] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Received: 05/31/2017] [Accepted: 08/09/2017] [Indexed: 11/19/2022]
Abstract
Of interest to the etiology of demyelinating autoimmune disease is the potential to aberrantly activate CD4+ T cells due to cross-recognition of multiple self-epitopes such as has been suggested for myelin oligodendrocyte glycoprotein epitope 35-55 (MOG35-55) and neurofilament medium protein epitope 15-35 (NFM15-35). NFM15-35 is immunogenic in C57BL/6 mice but fails to induce demyelinating disease by polyclonal T cells despite having the same TCR contact residues as MOG35-55, a known encephalitogenic Ag. Despite reported cross-reactivity with MOG-specific T cells, the polyclonal response to NFM15-35 did not expand threshold numbers of MOG38-49 tetramer-positive T cells. Furthermore, NFM lacked functional synergy with MOG to promote experimental autoimmune encephalomyelitis because NFM-deficient synonymous with knockout mice developed an identical disease course to wild-type mice after challenge with MOG35-55 Single-cell analysis of encephalitogenic T cells using the peptide:MHC monomer-based two-dimensional micropipette adhesion frequency assay confirmed that NFM was not a critical Ag driving demyelinating disease because NFM18-30-specific T cells in the CNS were predominantly reactive to MOG38-49 The absence of NFM contribution to disease allowed mapping of the amino acids required for encephalitogenicity and expansion of high-affinity, MOG-specific T cells that defined the polyclonal response. Alterations of N-terminal residues outside of the NFM15-35 core nonamer promoted expansion of high-affinity, MOG38-49 tetramer-positive T cells and promoted consistent experimental autoimmune encephalomyelitis induction, unlike mice challenged with NFM15-35 Although NFM15-35 is immunogenic and cross-reactive with MOG at the polyclonal level, it fails to expand a threshold level of encephalitogenic, high-affinity MOG-specific T cells.
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Affiliation(s)
- Lori Blanchfield
- Department of Microbiology and Immunology, Emory University, Atlanta, GA 30322
| | - Joseph J Sabatino
- Department of Neurology, University of California, San Francisco, San Francisco, CA 94158; and
| | - Laurel Lawrence
- Department of Microbiology and Immunology, Emory University, Atlanta, GA 30322
| | - Brian D Evavold
- Division of Microbiology and Immunology, Department of Pathology, University of Utah, Salt Lake City, UT 84112
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5
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Heterogeneity assessment of functional T cell avidity. Sci Rep 2017; 7:44320. [PMID: 28287160 PMCID: PMC5347081 DOI: 10.1038/srep44320] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Accepted: 02/06/2017] [Indexed: 12/18/2022] Open
Abstract
The potency of cellular immune responses strongly depends on T cell avidity to antigen. Yet, functional avidity measurements are rarely performed in patients, mainly due to the technical challenges of characterizing heterogeneous T cells. The mean functional T cell avidity can be determined by the IFN-γ Elispot assay, with titrated amounts of peptide. Using this assay, we developed a method revealing the heterogeneity of functional avidity, represented by the steepness/hillslope of the peptide titration curve, documented by proof of principle experiments and mathematical modeling. Our data show that not only natural polyclonal CD8 T cell populations from cancer patients, but also monoclonal T cells differ strongly in their heterogeneity of functional avidity. Interestingly, clones and polyclonal cells displayed comparable ranges of heterogeneity. We conclude that besides the mean functional avidity, it is feasible and useful to determine its heterogeneity (hillslope) for characterizing T cell responses in basic research and patient investigation.
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6
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Adenovirus Serotype 5 Vaccination Results in Suboptimal CD4 T Helper 1 Responses in Mice. J Virol 2017; 91:JVI.01132-16. [PMID: 28003483 DOI: 10.1128/jvi.01132-16] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2016] [Accepted: 12/06/2016] [Indexed: 02/06/2023] Open
Abstract
Adenovirus serotype 5 (Ad5) is one of the most widely used viral vectors and is known to generate potent T cell responses. While many previous studies have characterized Ad5-induced CD8 T cell responses, there is a relative lack of detailed studies that have analyzed CD4 T cells elicited by Ad5 vaccination. Here, we immunized mice with Ad5 vectors encoding lymphocytic choriomeningitis virus (LCMV) glycoprotein (GP) and examined GP-specific CD4 T cell responses elicited by Ad5 vectors and compared them to those induced by an acute LCMV infection. In contrast to LCMV infection, where balanced CD4 T helper 1 (Th1) and T follicular helper (Tfh) responses were induced, Ad5 immunization resulted in a significantly reduced frequency of Th1 cells. CD4 T cells elicited by Ad5 vectors expressed decreased levels of Th1 markers, such as Tim3, SLAM, T-bet, and Ly6C, had smaller amounts of cytotoxic molecules like granzyme B, and produced less interferon gamma than CD4 T cells induced by LCMV infection. This defective CD4 Th1 response appeared to be intrinsic for Ad5 vectors and not a reflection of comparing a nonreplicating vector to a live viral infection, since immunization with a DNA vector expressing LCMV-GP generated efficient CD4 Th1 responses. Analysis at early time points (day 3 or 4) after immunization with Ad5 vectors revealed a defect in the expression of CD25 (interleukin-2 [IL-2] receptor alpha chain) on Ad5-elicited CD4 T cells, and administration of exogenous IL-2 following Ad5 immunization partially restored CD4 Th1 responses. These results suggest that impairment of Th1 commitment after Ad5 immunization could be due to reduced IL-2-mediated signaling.IMPORTANCE During viral infection, generating balanced responses of Th1 and Tfh cells is important to induce effective cell-mediated responses and provide optimal help for antibody responses. In this study, to investigate vaccine-induced CD4 T cell responses, we characterized CD4 T cells after immunization with Ad5 vectors expressing LCMV-GP in mice. Ad5 vectors led to altered effector differentiation of LCMV GP-specific CD4 T cells compared to that during LCMV infection. CD4 T cells following Ad5 immunization exhibited impaired Th1 lineage commitment, generating significantly decreased Th1 responses than those induced by LCMV infection. Our results suggest that suboptimal IL-2 signaling possibly plays a role in reduced Th1 development following Ad5 immunization.
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7
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Chandran PA, Heidu S, Zelba H, Schmid-Horch B, Rammensee HG, Pascolo S, Gouttefangeas C. A Simple and Rapid Method for Quality Control of Major Histocompatibility Complex-Peptide Monomers by Flow Cytometry. Front Immunol 2017; 8:96. [PMID: 28228758 PMCID: PMC5296342 DOI: 10.3389/fimmu.2017.00096] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2016] [Accepted: 01/19/2017] [Indexed: 11/29/2022] Open
Abstract
Major histocompatibility complex (MHC) multimers are essential tools in T cell immunomonitoring, which are employed both in basic and clinical research, as well as for assessing clinical samples during therapy. The generation of MHC monomers loaded with synthetic peptides is an elaborate and time-consuming process. It would be beneficial to assess the quality of these monomers prior to downstream applications. In this technical note, we describe a novel flow cytometry-based, cell-free, quick, and robust assay to check the quality of MHC monomers directly after refolding or after long-term storage.
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Affiliation(s)
- P. Anoop Chandran
- Department of Immunology, Interfaculty Institute for Cell Biology, Eberhard Karls University and German Cancer Consortium (DKTK), German Cancer Research Center (DKFZ) Partner Site Tuebingen, Tuebingen, Germany
| | - Sonja Heidu
- Department of Immunology, Interfaculty Institute for Cell Biology, Eberhard Karls University and German Cancer Consortium (DKTK), German Cancer Research Center (DKFZ) Partner Site Tuebingen, Tuebingen, Germany
| | - Henning Zelba
- Department of Immunology, Interfaculty Institute for Cell Biology, Eberhard Karls University and German Cancer Consortium (DKTK), German Cancer Research Center (DKFZ) Partner Site Tuebingen, Tuebingen, Germany
| | - Barbara Schmid-Horch
- Center for Clinical Transfusion Medicine GmbH, University Hospital, Tuebingen, Germany
| | - Hans-Georg Rammensee
- Department of Immunology, Interfaculty Institute for Cell Biology, Eberhard Karls University and German Cancer Consortium (DKTK), German Cancer Research Center (DKFZ) Partner Site Tuebingen, Tuebingen, Germany
| | - Steve Pascolo
- Department of Dermatology, University Hospital, Zürich, Switzerland
| | - Cécile Gouttefangeas
- Department of Immunology, Interfaculty Institute for Cell Biology, Eberhard Karls University and German Cancer Consortium (DKTK), German Cancer Research Center (DKFZ) Partner Site Tuebingen, Tuebingen, Germany
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8
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Ozga AJ, Moalli F, Abe J, Swoger J, Sharpe J, Zehn D, Kreutzfeldt M, Merkler D, Ripoll J, Stein JV. pMHC affinity controls duration of CD8+ T cell-DC interactions and imprints timing of effector differentiation versus expansion. J Exp Med 2016; 213:2811-2829. [PMID: 27799622 PMCID: PMC5110015 DOI: 10.1084/jem.20160206] [Citation(s) in RCA: 73] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2016] [Revised: 07/01/2016] [Accepted: 09/30/2016] [Indexed: 11/29/2022] Open
Abstract
Ozga and colleagues use intravital two-photon microscopy and quantitative whole-organ imaging to reveal the dynamics of early affinity-driven CD8+ T cell activation. During adaptive immune responses, CD8+ T cells with low TCR affinities are released early into the circulation before high-affinity clones become dominant at later time points. How functional avidity maturation is orchestrated in lymphoid tissue and how low-affinity cells contribute to host protection remains unclear. In this study, we used intravital imaging of reactive lymph nodes (LNs) to show that T cells rapidly attached to dendritic cells irrespective of TCR affinity, whereas one day later, the duration of these stable interactions ceased progressively with lowering peptide major histocompatibility complex (pMHC) affinity. This correlated inversely BATF (basic leucine zipper transcription factor, ATF-like) and IRF4 (interferon-regulated factor 4) induction and timing of effector differentiation, as low affinity–primed T cells acquired cytotoxic activity earlier than high affinity–primed ones. After activation, low-affinity effector CD8+ T cells accumulated at efferent lymphatic vessels for egress, whereas high affinity–stimulated CD8+ T cells moved to interfollicular regions in a CXCR3-dependent manner for sustained pMHC stimulation and prolonged expansion. The early release of low-affinity effector T cells led to rapid target cell elimination outside reactive LNs. Our data provide a model for affinity-dependent spatiotemporal orchestration of CD8+ T cell activation inside LNs leading to functional avidity maturation and uncover a role for low-affinity effector T cells during early microbial containment.
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Affiliation(s)
- Aleksandra J Ozga
- Theodor Kocher Institute, University of Bern, 3012 Bern, Switzerland
| | - Federica Moalli
- Theodor Kocher Institute, University of Bern, 3012 Bern, Switzerland
| | - Jun Abe
- Theodor Kocher Institute, University of Bern, 3012 Bern, Switzerland
| | - Jim Swoger
- Systems Biology Research Unit, European Molecular Biology Laboratory/Centre for Genomic Regulation, Barcelona Institute of Science and Technology, 08003 Barcelona, Spain.,Universitat Pompeu Fabra, 08002 Barcelona, Spain
| | - James Sharpe
- Systems Biology Research Unit, European Molecular Biology Laboratory/Centre for Genomic Regulation, Barcelona Institute of Science and Technology, 08003 Barcelona, Spain.,Universitat Pompeu Fabra, 08002 Barcelona, Spain.,Institució Catalana de Recerca i Estudis Avançats, 08010 Barcelona, Spain
| | - Dietmar Zehn
- Swiss Vaccine Research Institute, Centre des laboratoires d'Epalinges, 1066 Epalinges, Switzerland.,Division of Immunology and Allergy, Department of Medicine, Lausanne University Hospital, 1011 Lausanne, Switzerland
| | - Mario Kreutzfeldt
- Department of Pathology and Immunology, University of Geneva, 1211 Geneva, Switzerland
| | - Doron Merkler
- Department of Pathology and Immunology, University of Geneva, 1211 Geneva, Switzerland
| | - Jorge Ripoll
- Department of Bioengineering and Aerospace Engineering, Universidad Carlos III of Madrid, 28911 Madrid, Spain.,Experimental Medicine and Surgery Unit, Instituto de Investigación Sanitaria del Hospital Gregorio Marañón, 28007 Madrid, Spain
| | - Jens V Stein
- Theodor Kocher Institute, University of Bern, 3012 Bern, Switzerland
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9
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Lythe G, Callard RE, Hoare RL, Molina-París C. How many TCR clonotypes does a body maintain? J Theor Biol 2015; 389:214-24. [PMID: 26546971 PMCID: PMC4678146 DOI: 10.1016/j.jtbi.2015.10.016] [Citation(s) in RCA: 94] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2015] [Revised: 09/13/2015] [Accepted: 10/07/2015] [Indexed: 01/08/2023]
Abstract
We consider the lifetime of a T cell clonotype, the set of T cells with the same T cell receptor, from its thymic origin to its extinction in a multiclonal repertoire. Using published estimates of total cell numbers and thymic production rates, we calculate the mean number of cells per TCR clonotype, and the total number of clonotypes, in mice and humans. When there is little peripheral division, as in a mouse, the number of cells per clonotype is small and governed by the number of cells with identical TCR that exit the thymus. In humans, peripheral division is important and a clonotype may survive for decades, during which it expands to comprise many cells. We therefore devise and analyse a computational model of homeostasis of a multiclonal population. Each T cell in the model competes for self pMHC stimuli, cells of any one clonotype only recognising a small fraction of the many subsets of stimuli. A constant mean total number of cells is maintained by a balance between cell division and death, and a stable number of clonotypes by a balance between thymic production of new clonotypes and extinction of existing ones. The number of distinct clonotypes in a human body may be smaller than the total number of naive T cells by only one order of magnitude. The number of T cells of one clonotype is an integer. The history of a clonotype starts with release from the thymus, and ends with extinction. Competition and cross-reactivity are included in a natural way. The average number of cells per clonotype, in a human body, is only of order 10.
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Affiliation(s)
- Grant Lythe
- Department of Applied Mathematics, School of Mathematics, University of Leeds, Leeds LS2 9JT, UK.
| | - Robin E Callard
- Institute for Child Health, University College London, 30 Guilford Street, London WC1N 1EH, UK; Centre for Mathematics and Physics in the Life Sciences and Experimental Biology, University College London, Gower Street, London WC1N 1EH, UK
| | - Rollo L Hoare
- Institute for Child Health, University College London, 30 Guilford Street, London WC1N 1EH, UK; Centre for Mathematics and Physics in the Life Sciences and Experimental Biology, University College London, Gower Street, London WC1N 1EH, UK
| | - Carmen Molina-París
- Department of Applied Mathematics, School of Mathematics, University of Leeds, Leeds LS2 9JT, UK
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10
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Frost EL, Kersh AE, Evavold BD, Lukacher AE. Cutting Edge: Resident Memory CD8 T Cells Express High-Affinity TCRs. THE JOURNAL OF IMMUNOLOGY 2015; 195:3520-4. [PMID: 26371252 DOI: 10.4049/jimmunol.1501521] [Citation(s) in RCA: 64] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2015] [Accepted: 08/10/2015] [Indexed: 11/19/2022]
Abstract
Tissue-resident memory T (TRM) cells serve as vanguards of antimicrobial host defense in nonlymphoid tissues, particularly at barrier epithelia and in organs with nonrenewable cell types (e.g., brain). In this study, we asked whether an augmented ability to sense Ag complemented their role as early alarms of pathogen invasion. Using mouse polyomavirus, we show that brain-resident mouse polyomavirus-specific CD8 T cells, unlike memory cells in the spleen, progressively increase binding to MHC class I tetramers and CD8 coreceptor expression. Using the two-dimensional micropipette adhesion-frequency assay, we show that TRM cells in brain, as well as in kidney, express TCRs with up to 20-fold higher affinity than do splenic memory T cells, whereas effector cells express TCRs of similar high affinity in all organs. Together, these data demonstrate that TRM cells retain high TCR affinity, which endows them with the high Ag sensitivity needed for front-line defense against infectious agents.
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Affiliation(s)
- Elizabeth L Frost
- Immunology and Molecular Pathogenesis Graduate Program, Emory University, Atlanta, GA 30322
| | - Anna E Kersh
- Immunology and Molecular Pathogenesis Graduate Program, Emory University, Atlanta, GA 30322; Department of Microbiology and Immunology, Emory University, Atlanta, GA 30322; and
| | - Brian D Evavold
- Department of Microbiology and Immunology, Emory University, Atlanta, GA 30322; and
| | - Aron E Lukacher
- Department of Microbiology and Immunology, The Pennsylvania State University College of Medicine, Hershey, PA 17033
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11
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Martinez RJ, Evavold BD. Lower Affinity T Cells are Critical Components and Active Participants of the Immune Response. Front Immunol 2015; 6:468. [PMID: 26441973 PMCID: PMC4564719 DOI: 10.3389/fimmu.2015.00468] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2015] [Accepted: 08/28/2015] [Indexed: 11/13/2022] Open
Abstract
Kinetic and biophysical parameters of T cell receptor (TCR) and peptide:MHC (pMHC) interaction define intrinsic factors required for T cell activation and differentiation. Although receptor ligand kinetics are somewhat cumbersome to assess experimentally, TCR:pMHC affinity has been shown to predict peripheral T cell functionality and potential for forming memory. Multimeric forms of pMHC monomers have often been used to provide an indirect readout of higher affinity T cells due to their availability and ease of use while allowing simultaneous definition of other functional and phenotypic characteristics. However, multimeric pMHC reagents have introduced a bias that underestimates the lower affinity components contained in the highly diverse TCR repertoires of all polyclonal T cell responses. Advances in the identification of lower affinity cells have led to the examination of these cells and their contribution to the immune response. In this review, we discuss the identification of high- vs. low-affinity T cells as well as their attributed signaling and functional differences. Lastly, mechanisms are discussed that maintain a diverse range of low- and high-affinity T cells.
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Affiliation(s)
- Ryan J. Martinez
- Department of Microbiology and Immunology, Emory University, Atlanta, GA, USA
| | - Brian D. Evavold
- Department of Microbiology and Immunology, Emory University, Atlanta, GA, USA
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12
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Myers LK, Cullins DL, Park JE, Yi AK, Brand DD, Rosloniec EF, Stuart JM, Kang AH. Peptide ligand structure and I-Aq binding avidity influence T cell signaling pathway utilization. Clin Immunol 2015; 160:188-97. [PMID: 25982319 DOI: 10.1016/j.clim.2015.05.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2015] [Revised: 05/05/2015] [Accepted: 05/07/2015] [Indexed: 11/29/2022]
Abstract
Factors that drive T cells to signal through differing pathways remain unclear. We have shown that an altered peptide ligand (A9) activates T cells to utilize an alternate signaling pathway which is dependent upon FcRγ and Syk. However, it remains unknown whether the affinity of peptide binding to MHC drives this selection. To answer this question we developed a panel of peptides designed so that amino acids interacting with the p6 and p9 predicted MHC binding pockets were altered. Analogs were tested for binding to I-A(q) using a competitive binding assay and selected analogs were administered to arthritic mice. Using the collagen-induced arthritis (CIA) model, arthritis severity was correlated with T cell cytokine production and molecular T cell signaling responses. We establish that reduced affinity of interaction with the MHC correlates with T cell signaling through the alternative pathway, leading ultimately to secretion of suppressive cytokines and attenuation of arthritis.
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Affiliation(s)
- Linda K Myers
- Department of Pediatrics, University of Tennessee Health Science Center, Memphis, TN 38163, United States.
| | - David L Cullins
- Department of Medicine, University of Tennessee Health Science Center, Memphis, TN 38163, United States
| | - Jeoung-Eun Park
- Department of Pediatrics, University of Tennessee Health Science Center, Memphis, TN 38163, United States
| | - Ae-Kyung Yi
- Department of Pediatrics, University of Tennessee Health Science Center, Memphis, TN 38163, United States
| | - David D Brand
- Department of Medicine, University of Tennessee Health Science Center, Memphis, TN 38163, United States; Research Service, Veterans Affairs Medical Center, Memphis, TN 38104, United States
| | - Edward F Rosloniec
- Department of Medicine, University of Tennessee Health Science Center, Memphis, TN 38163, United States; Research Service, Veterans Affairs Medical Center, Memphis, TN 38104, United States
| | - John M Stuart
- Department of Medicine, University of Tennessee Health Science Center, Memphis, TN 38163, United States; Research Service, Veterans Affairs Medical Center, Memphis, TN 38104, United States
| | - Andrew H Kang
- Department of Medicine, University of Tennessee Health Science Center, Memphis, TN 38163, United States; Research Service, Veterans Affairs Medical Center, Memphis, TN 38104, United States
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13
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Kersh AE, Edwards LJ, Evavold BD. Progression of relapsing-remitting demyelinating disease does not require increased TCR affinity or epitope spread. THE JOURNAL OF IMMUNOLOGY 2014; 193:4429-38. [PMID: 25267971 DOI: 10.4049/jimmunol.1401456] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
In this study, we investigate the basis of T cell recognition of myelin that governs the progression from acute symptoms into disease remission, relapse, and chronic progression in a secondary progressive model of demyelinating disease. Until now, the frequency and affinity of myelin-reactive CD4 T cells that elicit relapsing-remitting disease have not been quantified. The micropipette adhesion frequency assay was used to obtain a sensitive and physiologically relevant two-dimensional measurement of frequency and TCR affinity for myelin, as the inherent low affinity does not allow the use of specific peptide:MHC-II tetramers for this purpose. We found the highest affinity and frequency of polyclonal myelin oligodendrocyte glycoprotein-reactive cells infiltrate the CNS during acute disease, whereas affinities during remission, relapse, and chronic disease are not significantly different from each other. Frequency analysis revealed that the vast majority of CNS-infiltrating CD4 T cells are myelin oligodendrocyte glycoprotein reactive at all time points, demonstrating epitope spread is not a predominant factor for disease progression. Furthermore, time points at which mice were symptomatic were characterized by an infiltration of Th17 cells in the CNS, whereas symptom remission showed an enrichment of cells producing IFN-γ. Also, the ratio of regulatory T cells to Foxp3(-) CD4 T cells was significantly higher in the CNS at remission than during acute disease. The results of this study indicate that a high frequency of T cells specific for a single myelin Ag, rather than increased TCR affinity or epitope spread, governs the transition from acute symptoms through remission, relapse, and chronic disease states.
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Affiliation(s)
- Anna E Kersh
- Department of Microbiology and Immunology, Emory University, Atlanta, GA 30322; and
| | - Lindsay J Edwards
- Division of Rheumatology, Beth Israel Deaconess Medical Center, Boston, MA 02215
| | - Brian D Evavold
- Department of Microbiology and Immunology, Emory University, Atlanta, GA 30322; and
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14
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Bettini M, Blanchfield L, Castellaw A, Zhang Q, Nakayama M, Smeltzer MP, Zhang H, Hogquist KA, Evavold BD, Vignali DAA. TCR affinity and tolerance mechanisms converge to shape T cell diabetogenic potential. THE JOURNAL OF IMMUNOLOGY 2014; 193:571-9. [PMID: 24943217 DOI: 10.4049/jimmunol.1400043] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Autoreactive T cells infiltrating the target organ can possess a broad TCR affinity range. However, the extent to which such biophysical parameters contribute to T cell pathogenic potential remains unclear. In this study, we selected eight InsB9-23-specific TCRs cloned from CD4(+) islet-infiltrating T cells that possessed a relatively broad range of TCR affinity to generate NOD TCR retrogenic mice. These TCRs exhibited a range of two-dimensional affinities (∼ 10(-4)-10(-3) μm(4)) that correlated with functional readouts and responsiveness to activation in vivo. Surprisingly, both higher and lower affinity TCRs could mediate potent insulitis and autoimmune diabetes, suggesting that TCR affinity does not exclusively dictate or correlate with diabetogenic potential. Both central and peripheral tolerance mechanisms selectively impinge on the diabetogenic potential of high-affinity TCRs, mitigating their pathogenicity. Thus, TCR affinity and multiple tolerance mechanisms converge to shape and broaden the diabetogenic T cell repertoire, potentially complicating efforts to induce broad, long-term tolerance.
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Affiliation(s)
- Maria Bettini
- Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN 38105
| | - Lori Blanchfield
- Department of Microbiology and Immunology, Emory University, Atlanta, GA 30322
| | - Ashley Castellaw
- Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN 38105
| | - Qianxia Zhang
- Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN 38105
| | - Maki Nakayama
- Barbara Davis Center for Childhood Diabetes, University of Colorado Denver, Aurora, CO 80045
| | - Matthew P Smeltzer
- Department of Biostatistics, St. Jude Children's Research Hospital, Memphis, TN 38105; and
| | - Hui Zhang
- Department of Biostatistics, St. Jude Children's Research Hospital, Memphis, TN 38105; and
| | - Kristin A Hogquist
- Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, MN 55414
| | - Brian D Evavold
- Department of Microbiology and Immunology, Emory University, Atlanta, GA 30322
| | - Dario A A Vignali
- Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN 38105;
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15
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Laugel B. Bench, bedside, toolbox: T-cells deliver on every level. Front Immunol 2014; 5:31. [PMID: 24550915 PMCID: PMC3909921 DOI: 10.3389/fimmu.2014.00031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2013] [Accepted: 01/19/2014] [Indexed: 11/13/2022] Open
Affiliation(s)
- Bruno Laugel
- Institute of Infection and Immunity, Cardiff University School of Medicine , Cardiff , UK
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16
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Destabilization of peptide:MHC interaction induces IL-2 resistant anergy in diabetogenic T cells. J Autoimmun 2013; 44:82-90. [PMID: 23895744 DOI: 10.1016/j.jaut.2013.07.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2013] [Revised: 06/17/2013] [Accepted: 07/02/2013] [Indexed: 01/09/2023]
Abstract
Autoreactive T cells are responsible for inducing several autoimmune diseases, including type 1 diabetes. We have developed a strategy to induce unresponsiveness in these cells by destabilizing the peptide:MHC ligand recognized by the T cell receptor. By introducing amino acid substitutions into the immunogenic peptide at residues that bind to the MHC, the half life of the peptide:MHC complex is severely reduced, thereby resulting in abortive T cell activation and anergy. By treating a monoclonal diabetogenic T cell population with an MHC variant peptide, the cells are rendered unresponsive to the wild type ligand, as measured by both proliferation and IL-2 production. Stimulation of T cells with MHC variant peptides results in minimal Erk1/2 phosphorylation or cell division. Variant peptide stimulation effectively initiates a signaling program dominated by sustained tyrosine phosphatase activity, including elevated SHP-1 activity. These negative signaling events result in an anergic phenotype in which the T cells are not competent to signal through the IL-2 receptor, as evidenced by a lack of phospho-Stat5 upregulation and proliferation, despite high expression of the IL-2 receptor. This unique negative signaling profile provides a novel means to shut down the anti-self response.
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