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Shinzawa M, Moseman EA, Gossa S, Mano Y, Bhattacharya A, Guinter T, Alag A, Chen X, Cam M, McGavern DB, Erman B, Singer A. Reversal of the T cell immune system reveals the molecular basis for T cell lineage fate determination in the thymus. Nat Immunol 2022; 23:731-742. [PMID: 35523960 PMCID: PMC9098387 DOI: 10.1038/s41590-022-01187-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Accepted: 03/15/2022] [Indexed: 12/03/2022]
Abstract
T cell specificity and function are linked during development, as MHC-II-specific TCR signals generate CD4 helper T cells and MHC-I-specific TCR signals generate CD8 cytotoxic T cells, but the basis remains uncertain. We now report that switching coreceptor proteins encoded by Cd4 and Cd8 gene loci functionally reverses the T cell immune system, generating CD4 cytotoxic and CD8 helper T cells. Such functional reversal reveals that coreceptor proteins promote the helper-lineage fate when encoded by Cd4, but promote the cytotoxic-lineage fate when encoded in Cd8—regardless of the coreceptor proteins each locus encodes. Thus, T cell lineage fate is determined by cis-regulatory elements in coreceptor gene loci and is not determined by the coreceptor proteins they encode, invalidating coreceptor signal strength as the basis of lineage fate determination. Moreover, we consider that evolution selected the particular coreceptor proteins that Cd4 and Cd8 gene loci encode to avoid generating functionally reversed T cells because they fail to promote protective immunity against environmental pathogens. To determine how T cell lineage fates are determined in the thymus, Singer and colleagues generated ‘FlipFlop’ mice with a functionally reversed T cell immune system that distinguishes TCR signal strength versus TCR signal duration.
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Affiliation(s)
- Miho Shinzawa
- Experimental Immunology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - E Ashley Moseman
- Viral Immunology and Intravital Imaging Section, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, USA.,Department of Immunology, Duke University School of Medicine, Durham, NC, USA
| | - Selamawit Gossa
- Viral Immunology and Intravital Imaging Section, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, USA
| | - Yasuko Mano
- Experimental Immunology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Abhisek Bhattacharya
- Experimental Immunology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Terry Guinter
- Experimental Immunology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Amala Alag
- Experimental Immunology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Xiongfong Chen
- Office of Science and Technology Resources, Office of the Director, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA.,CCR-SF Bioinformatics Group, Advanced Biomedical Computational Science, Biomedical Informatics and Data Science Directorate, Frederick National Laboratory for Cancer Research, Frederick, MD, USA
| | - Maggie Cam
- Office of Science and Technology Resources, Office of the Director, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Dorian B McGavern
- Viral Immunology and Intravital Imaging Section, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, USA
| | - Batu Erman
- Department of Molecular Biology and Genetics, Bogazici University, Istanbul, Turkey
| | - Alfred Singer
- Experimental Immunology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA.
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2
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Chopp LB, Gopalan V, Ciucci T, Ruchinskas A, Rae Z, Lagarde M, Gao Y, Li C, Bosticardo M, Pala F, Livak F, Kelly MC, Hannenhalli S, Bosselut R. An Integrated Epigenomic and Transcriptomic Map of Mouse and Human αβ T Cell Development. Immunity 2020; 53:1182-1201.e8. [PMID: 33242395 PMCID: PMC8641659 DOI: 10.1016/j.immuni.2020.10.024] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Revised: 08/25/2020] [Accepted: 10/29/2020] [Indexed: 12/13/2022]
Abstract
αβ lineage T cells, most of which are CD4+ or CD8+ and recognize MHC I- or MHC II-presented antigens, are essential for immune responses and develop from CD4+CD8+ thymocytes. The absence of in vitro models and the heterogeneity of αβ thymocytes have hampered analyses of their intrathymic differentiation. Here, combining single-cell RNA and ATAC (chromatin accessibility) sequencing, we identified mouse and human αβ thymocyte developmental trajectories. We demonstrated asymmetric emergence of CD4+ and CD8+ lineages, matched differentiation programs of agonist-signaled cells to their MHC specificity, and identified correspondences between mouse and human transcriptomic and epigenomic patterns. Through computational analysis of single-cell data and binding sites for the CD4+-lineage transcription factor Thpok, we inferred transcriptional networks associated with CD4+- or CD8+-lineage differentiation, and with expression of Thpok or of the CD8+-lineage factor Runx3. Our findings provide insight into the mechanisms of CD4+ and CD8+ T cell differentiation and a foundation for mechanistic investigations of αβ T cell development.
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Affiliation(s)
- Laura B Chopp
- Laboratory of Immune Cell Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA; Immunology Graduate Group, University of Pennsylvania Medical School, Philadelphia, PA, USA
| | - Vishaka Gopalan
- Cancer Data Science Laboratory, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Thomas Ciucci
- Laboratory of Immune Cell Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Allison Ruchinskas
- Cancer Research Technology Program, Single Cell Analysis Facility, Frederick National Laboratory for Cancer Research, Bethesda, MD, USA
| | - Zachary Rae
- Cancer Research Technology Program, Single Cell Analysis Facility, Frederick National Laboratory for Cancer Research, Bethesda, MD, USA
| | - Manon Lagarde
- Laboratory of Immune Cell Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Yayi Gao
- Laboratory of Immune Cell Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Caiyi Li
- Laboratory of Genomic Integrity, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Marita Bosticardo
- Laboratory of Clinical Immunology and Microbiology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Francesca Pala
- Laboratory of Clinical Immunology and Microbiology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Ferenc Livak
- Laboratory of Genomic Integrity, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Michael C Kelly
- Cancer Research Technology Program, Single Cell Analysis Facility, Frederick National Laboratory for Cancer Research, Bethesda, MD, USA
| | - Sridhar Hannenhalli
- Cancer Data Science Laboratory, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Rémy Bosselut
- Laboratory of Immune Cell Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA.
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3
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Nomura A, Taniuchi I. The Role of CD8 Downregulation during Thymocyte Differentiation. Trends Immunol 2020; 41:972-981. [DOI: 10.1016/j.it.2020.09.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Revised: 09/11/2020] [Accepted: 09/12/2020] [Indexed: 11/26/2022]
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4
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Kojo S, Ohno-Oishi M, Wada H, Nieke S, Seo W, Muroi S, Taniuchi I. Constitutive CD8 expression drives innate CD8 + T-cell differentiation via induction of iNKT2 cells. Life Sci Alliance 2020; 3:3/2/e202000642. [PMID: 31980555 PMCID: PMC6985454 DOI: 10.26508/lsa.202000642] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Revised: 01/16/2020] [Accepted: 01/17/2020] [Indexed: 01/26/2023] Open
Abstract
Temporal down-regulation of the CD8 co-receptor after receiving positive-selection signals has been proposed to serve as an important determinant to segregate helper versus cytotoxic lineages by generating differences in the duration of TCR signaling between MHC-I and MHC-II selected thymocytes. By contrast, little is known about whether CD8 also modulates TCR signaling engaged by the non-classical MHC-I-like molecule, CD1d, during development of invariant natural killer T (iNKT) cells. Here, we show that constitutive transgenic CD8 expression resulted in enhanced differentiation of innate memory-like CD8+ thymocytes in both a cell-intrinsic and cell-extrinsic manner, the latter being accomplished by an increase in the IL-4-producing iNKT2 subset. Skewed iNKT2 differentiation requires cysteine residues in the intracellular domain of CD8α that are essential for transmitting cellular signaling. Collectively, these findings shed a new light on the relevance of CD8 down-regulation in shaping the balance of iNKT-cell subsets by modulating TCR signaling.
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Affiliation(s)
- Satoshi Kojo
- Laboratory for Transcriptional Regulation, RIKEN Center for Integrative Medical Sciences, Yokohama, Japan
| | - Michiko Ohno-Oishi
- Laboratory for Transcriptional Regulation, RIKEN Center for Integrative Medical Sciences, Yokohama, Japan
| | - Hisashi Wada
- Laboratory for Transcriptional Regulation, RIKEN Center for Integrative Medical Sciences, Yokohama, Japan
| | - Sebastian Nieke
- Laboratory for Transcriptional Regulation, RIKEN Center for Integrative Medical Sciences, Yokohama, Japan
| | - Wooseok Seo
- Laboratory for Transcriptional Regulation, RIKEN Center for Integrative Medical Sciences, Yokohama, Japan
| | - Sawako Muroi
- Laboratory for Transcriptional Regulation, RIKEN Center for Integrative Medical Sciences, Yokohama, Japan
| | - Ichiro Taniuchi
- Laboratory for Transcriptional Regulation, RIKEN Center for Integrative Medical Sciences, Yokohama, Japan
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5
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Abstract
A fundamental question in developmental immunology is how bipotential thymocyte precursors generate both CD4+ helper and CD8+ cytotoxic T cell lineages. The MHC specificity of αβ T cell receptors (TCRs) on precursors is closely correlated with cell fate-determining processes, prompting studies to characterize how variations in TCR signaling are linked with genetic programs establishing lineage-specific gene expression signatures, such as exclusive CD4 or CD8 expression. The key transcription factors ThPOK and Runx3 have been identified as mediating development of helper and cytotoxic T cell lineages, respectively. Together with increasing knowledge of epigenetic regulators, these findings have advanced our understanding of the transcription factor network regulating the CD4/CD8 dichotomy. It has also become apparent that CD4+ T cells retain developmental plasticity, allowing them to acquire cytotoxic activity in the periphery. Despite such advances, further studies are necessary to identify the molecular links between TCR signaling and the nuclear machinery regulating expression of ThPOK and Runx3.
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Affiliation(s)
- Ichiro Taniuchi
- Laboratory for Transcriptional Regulation, RIKEN Center for Integrative Medical Sciences, Yokohama, Kanagawa 230-0045, Japan;
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6
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Abstract
During differentiation of CD4+CD8+ double-positive (DP) thymocytes into the CD4-CD8+ single-positive (CD8SP) thymocytes committed to the cytotoxic T cell lineage, Cd8a transcription is temporally terminated after positive selection and is subsequently reinitiated, a process known as coreceptor reversal. Despite the identification of a transcriptional enhancer in the Cd8a gene that directs reporter transgene expression specifically in CD8SP thymocytes, the molecular mechanisms controlling reactivation of the Cd8a gene are not fully understood. Here, we show that, after positive selection, hCD2 reporter expression from the Cd8a locus, which was generated by insertion of hCD2 cDNA into the first exon of the Cd8a gene, requires the incorporation of intron sequences into the hCD2 transcript. The presence of polyadenylation signals after hCD2 cDNA inhibited hCD2 expression in mature CD8+ T cells, whereas hCD2 expression in DP thymocytes recapitulated the Cd8a expression. Incorporation of the endogenous short intron structure and heterologous intron structure of the Cd4 locus restored hCD2 expression in mature CD8+ T cells in a variegated manner. Interestingly, stage-specific DNA demethylation was impaired in Cd8a reporter alleles that failed to express hCD2 in CD8+ T cells, and intron sequences lacking RNA splicing signals still restored hCD2 expression. These observations indicate that "intron-mediated enhancement" is involved in a stage-specific reactivation of the Cd8a locus harboring hCD2 cDNA. However, the Cd8a gene was transcribed in mature CD8+ T cells, albeit at a lower level, from a mutant Cd8a locus lacking intron structures, suggesting that protein-coding sequences in transcripts affect sensitivity to intron-mediated enhancement.
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7
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Identification of lineage-specifying cytokines that signal all CD8 +-cytotoxic-lineage-fate 'decisions' in the thymus. Nat Immunol 2017; 18:1218-1227. [PMID: 28945245 PMCID: PMC5659273 DOI: 10.1038/ni.3847] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2017] [Accepted: 08/29/2017] [Indexed: 12/11/2022]
Abstract
T cell antigen receptor (TCR) signaling in the thymus initiates positive selection but CD8 lineage fate is thought to be induced by cytokines after TCR signaling has ceased, although this remains controversial and unproven. We now identify four non-common gamma chain (γc) receptor-signaling cytokines (IL-6, IFN-γ, TSLP, TGF-β) that, like IL-7 and IL-15, induce expression of the lineage-specifying transcription factor Runx3d and signal the generation of CD8 T cells. Remarkably, elimination of in vivo signaling by all ‘lineage-specifying cytokines’ during positive selection eliminated Runx3d expression and completely abrogated CD8 single-positive thymocyte generation. Thus, this study proves that signaling during positive selection by lineage-specifying cytokines is responsible for all CD8 lineage fate decisions in the thymus.
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8
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Northrup D, Yagi R, Cui K, Proctor WR, Wang C, Placek K, Pohl LR, Wang R, Ge K, Zhu J, Zhao K. Histone demethylases UTX and JMJD3 are required for NKT cell development in mice. Cell Biosci 2017; 7:25. [PMID: 28529687 PMCID: PMC5436453 DOI: 10.1186/s13578-017-0152-8] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Accepted: 05/02/2017] [Indexed: 02/06/2023] Open
Abstract
Background Natural killer (NK)T cells and conventional T cells share phenotypic characteristic however they differ in transcription factor requirements and functional properties. The role of histone modifying enzymes in conventional T cell development has been extensively studied, little is known about the function of enzymes regulating histone methylation in NKT cells. Results We show that conditional deletion of histone demethylases UTX and JMJD3 by CD4-Cre leads to near complete loss of liver NKT cells, while conventional T cells are less affected. Loss of NKT cells is cell intrinsic and not due to an insufficient selection environment. The absence of NKT cells in UTX/JMJD3-deficient mice protects mice from concanavalin A‐induced liver injury, a model of NKT‐mediated hepatitis. GO‐analysis of RNA-seq data indicates that cell cycle genes are downregulated in UTX/JMJD3-deleted NKT progenitors, and suggest that failed expansion may account for some of the cellular deficiency. The phenotype appears to be demethylase‐dependent, because UTY, a homolog of UTX that lacks catalytic function, is not sufficient to restore their development and removal of H3K27me3 by deletion of EZH2 partially rescues the defect. Conclusions NKT cell development and gene expression is sensitive to proper regulation of H3K27 methylation. The H3K27me3 demethylase enzymes, in particular UTX, promote NKT cell development, and are required for effective NKT function. Electronic supplementary material The online version of this article (doi:10.1186/s13578-017-0152-8) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Daniel Northrup
- Systems Biology Center, National Heart, Lung and Blood Institute, National Institutes of Health (NIH), Bethesda, MD 20892 USA
| | - Ryoji Yagi
- Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, NIH, Bethesda, MD 20892 USA
| | - Kairong Cui
- Systems Biology Center, National Heart, Lung and Blood Institute, National Institutes of Health (NIH), Bethesda, MD 20892 USA
| | - William R Proctor
- Center of Immunology, National Heart, Lung and Blood Institute, NIH, Bethesda, MD 20892 USA
| | - Chaochen Wang
- Laboratory of Endocrinology and Receptor Biology, National Institute of Diabetes and Digestive and Kidney Diseases, NIH, Bethesda, MD 20892 USA
| | - Katarzyna Placek
- Systems Biology Center, National Heart, Lung and Blood Institute, National Institutes of Health (NIH), Bethesda, MD 20892 USA
| | - Lance R Pohl
- Center of Immunology, National Heart, Lung and Blood Institute, NIH, Bethesda, MD 20892 USA
| | - Rongfu Wang
- Departments of Pathology and Immunology, Center for Cell and Gene Therapy, Dan L. Duncan Cancer Center, Baylor College of Medicine, Houston, TX 77030 USA
| | - Kai Ge
- Laboratory of Endocrinology and Receptor Biology, National Institute of Diabetes and Digestive and Kidney Diseases, NIH, Bethesda, MD 20892 USA
| | - Jinfang Zhu
- Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, NIH, Bethesda, MD 20892 USA
| | - Keji Zhao
- Systems Biology Center, National Heart, Lung and Blood Institute, National Institutes of Health (NIH), Bethesda, MD 20892 USA
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9
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Mitchell JL, Seng A, Yankee TM. Expression patterns of Ikaros family members during positive selection and lineage commitment of human thymocytes. Immunology 2016; 149:400-412. [PMID: 27502439 DOI: 10.1111/imm.12657] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2016] [Revised: 07/19/2016] [Accepted: 08/03/2016] [Indexed: 12/12/2022] Open
Abstract
The Ikaros family of transcription factors is essential for normal T-cell development, but their expression pattern in human thymocytes remains poorly defined. Our goal is to determine how protein levels of Ikaros, Helios and Aiolos change as human thymocytes progress through the positive selection and lineage commitment stages. To accomplish this goal, we used multi-parameter flow cytometry to define the populations in which positive selection and lineage commitment are most likely to occur. After human thymocytes express CD3 and receive positive selection signals, the cells down-regulate expression of CD4 to become transitional single-positive (TSP) CD8+ thymocytes. At this stage, there was a transient increase in the Ikaros, Helios and Aiolos protein levels. After the TSP CD8+ developmental stage, some thymocytes re-express CD4 and become CD3hi double-positive thymocytes before down-regulating CD8 to become mature single-positive CD4+ thymocytes. Except for regulatory T cells, Helios protein levels declined and Aiolos protein levels transiently increased during CD4+ T-cell maturation. For thymocytes progressing toward the CD8+ T-cell lineage, TSP CD8+ thymocytes increase their expression of CD3 and maintain high levels of Aiolos protein as the cells complete their maturation. In summary, we defined the TSP CD8+ developmental stage in human T-cell development and propose that this stage is where CD4/CD8 lineage commitment occurs. Ikaros, Helios and Aiolos each undergo a transient increase in protein levels at the TSP stage before diverging in their expression patterns at later stages.
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Affiliation(s)
- Julie L Mitchell
- Department of Microbiology, Molecular Genetics, and Immunology, University of Kansas Medical Center, Kansas City, KS, USA
| | - Amara Seng
- Department of Microbiology, Molecular Genetics, and Immunology, University of Kansas Medical Center, Kansas City, KS, USA
| | - Thomas M Yankee
- Department of Microbiology, Molecular Genetics, and Immunology, University of Kansas Medical Center, Kansas City, KS, USA.
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10
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Kincaid EZ, Murata S, Tanaka K, Rock KL. Specialized proteasome subunits have an essential role in the thymic selection of CD8(+) T cells. Nat Immunol 2016; 17:938-45. [PMID: 27294792 PMCID: PMC4955723 DOI: 10.1038/ni.3480] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2015] [Accepted: 05/02/2016] [Indexed: 12/11/2022]
Abstract
The cells that stimulate positive selection express specialized proteasome β-subunits different from those expressed by all other cells, including those involved in negative selection. Mice that lack all four specialized proteasome β-subunits, and therefore express only constitutive proteasomes in all cells, had a profound defect in the generation of CD8(+) T cells. While a defect in positive selection would reflect an inability to generate the appropriate positively selecting peptides, a block at negative selection would point to the potential need to switch peptides between positive selection and negative selection to avoid the two processes' often cancelling each other out. We found that the block in T cell development occurred around the checkpoints of positive selection and, unexpectedly, negative selection as well.
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Affiliation(s)
- Eleanor Z. Kincaid
- Department of Pathology, University of Massachusetts Medical School, Worcester, MA, U.S.A
| | - Shigeo Murata
- Laboratory of Protein Metabolism, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | - Keiji Tanaka
- Laboratory of Protein Metabolism, Tokyo Metropolitan Institute of Medical Science, Tokyo, Japan
| | - Kenneth L. Rock
- Department of Pathology, University of Massachusetts Medical School, Worcester, MA, U.S.A
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11
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Legut M, Cole DK, Sewell AK. The promise of γδ T cells and the γδ T cell receptor for cancer immunotherapy. Cell Mol Immunol 2015; 12:656-68. [PMID: 25864915 PMCID: PMC4716630 DOI: 10.1038/cmi.2015.28] [Citation(s) in RCA: 88] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2015] [Accepted: 03/01/2015] [Indexed: 12/13/2022] Open
Abstract
γδ T cells form an important part of adaptive immune responses against infections and malignant transformation. The molecular targets of human γδ T cell receptors (TCRs) remain largely unknown, but recent studies have confirmed the recognition of phosphorylated prenyl metabolites, lipids in complex with CD1 molecules and markers of cellular stress. All of these molecules are upregulated on various cancer types, highlighting the potential importance of the γδ T cell compartment in cancer immunosurveillance and paving the way for the use of γδ TCRs in cancer therapy. Ligand recognition by the γδ TCR often requires accessory/co-stimulatory stress molecules on both T cells and target cells; this cellular stress context therefore provides a failsafe against harmful self-reactivity. Unlike αβ T cells, γδ T cells recognise their targets irrespective of HLA haplotype and therefore offer exciting possibilities for off-the-shelf, pan-population cancer immunotherapies. Here, we present a review of known ligands of human γδ T cells and discuss the promise of harnessing these cells for cancer treatment.
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MESH Headings
- Antigen Presentation
- Antigens, CD1/genetics
- Antigens, CD1/immunology
- Antigens, Neoplasm/genetics
- Antigens, Neoplasm/immunology
- Clinical Trials as Topic
- Gene Expression Regulation, Neoplastic/immunology
- Hemiterpenes/immunology
- Humans
- Immunotherapy/methods
- Ligands
- Models, Molecular
- Monitoring, Immunologic
- Neoplasms/genetics
- Neoplasms/immunology
- Neoplasms/pathology
- Neoplasms/therapy
- Organophosphorus Compounds/immunology
- Phosphorylation
- Protein Structure, Tertiary
- Receptors, Antigen, T-Cell, gamma-delta/genetics
- Receptors, Antigen, T-Cell, gamma-delta/immunology
- Signal Transduction
- T-Lymphocytes/immunology
- T-Lymphocytes/pathology
- T-Lymphocytes/transplantation
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Affiliation(s)
- Mateusz Legut
- Division of Infection and Immunity and Systems Immunity University Research Institute, Cardiff University School of Medicine, Cardiff, UK
| | - David K Cole
- Division of Infection and Immunity and Systems Immunity University Research Institute, Cardiff University School of Medicine, Cardiff, UK
| | - Andrew K Sewell
- Division of Infection and Immunity and Systems Immunity University Research Institute, Cardiff University School of Medicine, Cardiff, UK
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12
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Jurberg AD, Vasconcelos-Fontes L, Cotta-de-Almeida V. A Tale from TGF-β Superfamily for Thymus Ontogeny and Function. Front Immunol 2015; 6:442. [PMID: 26441956 PMCID: PMC4564722 DOI: 10.3389/fimmu.2015.00442] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2015] [Accepted: 08/14/2015] [Indexed: 12/16/2022] Open
Abstract
Multiple signaling pathways control every aspect of cell behavior, organ formation, and tissue homeostasis throughout the lifespan of any individual. This review takes an ontogenetic view focused on the large superfamily of TGF-β/bone morphogenetic protein ligands to address thymus morphogenesis and function in T cell differentiation. Recent findings on a role of GDF11 for reversing aging-related phenotypes are also discussed.
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Affiliation(s)
- Arnon Dias Jurberg
- Laboratory on Thymus Research, Oswaldo Cruz Institute, Oswaldo Cruz Foundation (Fiocruz) , Rio de Janeiro , Brazil ; Graduate Program in Cell and Developmental Biology, Institute of Biomedical Sciences, Federal University of Rio de Janeiro , Rio de Janeiro , Brazil
| | - Larissa Vasconcelos-Fontes
- Laboratory on Thymus Research, Oswaldo Cruz Institute, Oswaldo Cruz Foundation (Fiocruz) , Rio de Janeiro , Brazil
| | - Vinícius Cotta-de-Almeida
- Laboratory on Thymus Research, Oswaldo Cruz Institute, Oswaldo Cruz Foundation (Fiocruz) , Rio de Janeiro , Brazil
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13
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Abstract
During blood cell development, hematopoietic stem cells generate diverse mature populations via several rounds of binary fate decisions. At each bifurcation, precursors adopt one fate and inactivate the alternative fate either stochastically or in response to extrinsic stimuli and stably maintain the selected fates. Studying of these processes would contribute to better understanding of etiology of immunodeficiency and leukemia, which are caused by abnormal gene regulation during the development of hematopoietic cells. The CD4(+) helper versus CD8(+) cytotoxic T-cell fate decision serves as an excellent model to study binary fate decision processes. These two cell types are derived from common precursors in the thymus. Positive selection of their TCRs by self-peptide presented on either MHC class I or class II triggers their fate decisions along with mutually exclusive retention and silencing of two coreceptors, CD4 and CD8. In the past few decades, extensive effort has been made to understand the T-cell fate decision processes by studying regulation of genes encoding the coreceptors and selection processes. These studies have identified several key transcription factors and gene regulatory networks. In this chapter, I will discuss recent advances in our understanding of the binary cell fate decision processes of T cells.
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Affiliation(s)
- Takeshi Egawa
- Department of Pathology and Immunology, School of Medicine, Washington University in St. Louis, St. Louis, Missouri, USA.
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14
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The transcription factor ThPOK suppresses Runx3 and imposes CD4(+) lineage fate by inducing the SOCS suppressors of cytokine signaling. Nat Immunol 2014; 15:638-45. [PMID: 24880459 DOI: 10.1038/ni.2917] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2014] [Accepted: 05/07/2014] [Indexed: 11/08/2022]
Abstract
Lineage fate in the thymus is determined by mutually exclusive expression of the transcription factors ThPOK and Runx3, with ThPOK imposing the CD4(+) lineage fate and Runx3 promoting the CD8(+) lineage fate. While it is known that cytokine signals induce thymocytes to express Runx3, it is not known how ThPOK prevents thymocytes from expressing Runx3 and adopting the CD8(+) lineage fate, nor is it understood why ThPOK itself imposes the CD4(+) lineage fate on thymocytes. We now report that genes encoding members of the SOCS (suppressor of cytokine signaling) family are critical targets of ThPOK and that their induction by ThPOK represses Runx3 expression and promotes the CD4(+) lineage fate. Thus, induction of SOCS-encoding genes is the main mechanism by which ThPOK imposes the CD4(+) lineage fate in the thymus.
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15
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Henson DM, Chou C, Sakurai N, Egawa T. A silencer-proximal intronic region is required for sustained CD4 expression in postselection thymocytes. THE JOURNAL OF IMMUNOLOGY 2014; 192:4620-7. [PMID: 24729613 DOI: 10.4049/jimmunol.1302374] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
It has been proposed that differential kinetics of CD4/CD8 coreceptors regulate fate choice of selected thymocytes. Sustained signals by interaction between MHC class II and TCR/CD4 is required for commitment to the CD4 helper lineage. Although prematurely terminated MHC-TCR/CD4 interaction in transgenic mouse models results in lineage redirection, it is unclear whether CD4 expression is actively maintained by endogenous cis-elements to facilitate prolonged signaling under physiological conditions. In this article, we show that sustained CD4 expression in postselection thymocytes requires an intronic sequence containing an uncharacterized DNase I hypersensitivity (DHS) site located 3' to the silencer. Despite normal CD4 expression before selection, thymocytes lacking a 1.5-kb sequence in intron 1 including the 0.4-kb silencer and the DHS, but not the 0.4-kb silencer alone, failed to maintain CD4 expression upon positive selection and are redirected to the CD8 lineage after MHC class II-restricted selection. Furthermore, CpG dinucleotides adjacent to the DHS are hypermethylated in CD8(+) T cells. These results indicate that the 1.5-kb cis-element is required in postselection thymocytes for helper lineage commitment, presumably mediating the maintenance of CD4 expression, and suggest that inactivation of the cis-element by DNA methylation may contribute to epigenetic Cd4 silencing.
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Affiliation(s)
- David M Henson
- Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, MO 63110
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Transcriptional control of CD4 and CD8 coreceptor expression during T cell development. Cell Mol Life Sci 2013; 70:4537-53. [PMID: 23793512 PMCID: PMC3827898 DOI: 10.1007/s00018-013-1393-2] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2013] [Revised: 05/27/2013] [Accepted: 05/29/2013] [Indexed: 11/24/2022]
Abstract
The differentiation and function of peripheral helper and cytotoxic T cell lineages is coupled with the expression of CD4 and CD8 coreceptor molecules, respectively. This indicates that the control of coreceptor gene expression is closely linked with the regulation of CD4/CD8 lineage decision of DP thymocytes. Research performed during the last two decades revealed comprehensive mechanistic insight into the developmental stage- and subset/lineage-specific regulation of Cd4, Cd8a and Cd8b1 (Cd8) gene expression. These studies provided important insight into transcriptional control mechanisms during T cell development and into the regulation of cis-regulatory networks in general. Moreover, the identification of transcription factors involved in the regulation of CD4 and CD8 significantly advanced the knowledge of the transcription factor network regulating CD4/CD8 cell-fate choice of DP thymocytes. In this review, we provide an overview of the identification and characterization of CD4/CD8 cis-regulatory elements and present recent progress in our understanding of how these cis-regulatory elements control CD4/CD8 expression during T cell development and in peripheral T cells. In addition, we describe the transcription factors implicated in the regulation of coreceptor gene expression and discuss how these factors are integrated into the transcription factor network that regulates CD4/CD8 cell-fate choice of DP thymocytes.
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Martínez-Sosa P, Mendoza L. The regulatory network that controls the differentiation of T lymphocytes. Biosystems 2013; 113:96-103. [PMID: 23743337 DOI: 10.1016/j.biosystems.2013.05.007] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2012] [Revised: 02/13/2013] [Accepted: 05/21/2013] [Indexed: 12/22/2022]
Abstract
There is a vast amount of molecular information regarding the differentiation of T lymphocytes, in particular regarding in vitro experimental treatments that modify their differentiation process. This publicly available information was used to infer the regulatory network that controls the differentiation of T lymphocytes into CD4(+) and CD8(+) cells. Hereby we present a network that consists of 50 nodes and 97 regulatory interactions, representing the main signaling circuits established among molecules and molecular complexes regulating the differentiation of T cells. The network was converted into a continuous dynamical system in the form of a set of coupled ordinary differential equations, and its dynamical behavior was studied. With the aid of numerical methods, nine fixed point attractors were found for the dynamical system. These attractors correspond to the activation patterns observed experimentally for the following cell types: CD4(-)CD8(-), CD4(+)CD8(+), CD4(+) naive, Th1, Th2, Th17, Treg, CD8(+) naive, and CTL. Furthermore, the model is able to describe the differentiation process from the precursor CD4(-)CD8(-) to any of the effector types due to a specific series of extracellular signals.
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Affiliation(s)
- Pablo Martínez-Sosa
- Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Apartado Postal 70228, Ciudad Universitaria, CP04510 México, D.F., Mexico
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Shen X, Niu C, König R. Increased numbers and suppressive activity of regulatory CD25(+)CD4(+) T lymphocytes in the absence of CD4 engagement by MHC class II molecules. Cell Immunol 2013; 282:117-28. [PMID: 23770721 DOI: 10.1016/j.cellimm.2013.05.002] [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: 10/16/2012] [Revised: 04/26/2013] [Accepted: 05/06/2013] [Indexed: 11/28/2022]
Abstract
Mechanisms of central and peripheral tolerance prevent autoimmunity. Regulatory T cells inhibit the activation of potentially auto-reactive T cells in peripheral lymphoid organs. In transgenic mice in which all MHC class II molecules are incapable of binding to CD4, class II MHC-restricted T cells preferentially differentiated into immunosuppressive, regulatory T cells. In these mutant MHC class II transgenic mice, a subset of CD4(+) T cells constitutively expressed moderately elevated levels of CD25 and potently inhibited interleukin-2 secretion by T cells from normal mice in a cell-to-cell, contact-dependent manner. Immunosuppressive activity depended on activation of the regulatory T cells. Thus, CD25(+)CD4(+) T cells from mutant MHC class II transgenic mice resembled phenotypically and functionally a major subset of natural regulatory T cells in normal mice, but were two to three-times more abundant. These results further clarify the mechanisms that govern the differentiation and maintenance of CD25(+)CD4(+) regulatory T cells, and present avenues for immunomodulation.
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Affiliation(s)
- Xiaoli Shen
- Department of Microbiology and Immunology, The University of Texas Medical Branch, Galveston, TX 77555-1019, USA
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Tanaka H, Naito T, Muroi S, Seo W, Chihara R, Miyamoto C, Kominami R, Taniuchi I. Epigenetic Thpok silencing limits the time window to choose CD4(+) helper-lineage fate in the thymus. EMBO J 2013; 32:1183-94. [PMID: 23481257 DOI: 10.1038/emboj.2013.47] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2012] [Accepted: 02/06/2013] [Indexed: 12/17/2022] Open
Abstract
CD4(+) helper and CD8(+) cytotoxic T cells differentiate from common precursors in the thymus after T-cell receptor (TCR)-mediated selection. Commitment to the helper lineage depends on persistent TCR signals and expression of the ThPOK transcription factor, whereas a ThPOK cis-regulatory element, ThPOK silencer, represses Thpok gene expression during commitment to the cytotoxic lineage. Here, we show that silencer-mediated alterations of chromatin structures in cytotoxic-lineage thymocytes establish a repressive state that is epigenetically inherited in peripheral CD8(+) T cells even after removal of the silencer. When silencer activity is enhanced in helper-lineage cells, by increasing its copy number, a similar heritable Thpok silencing occurs. Epigenetic locking of the Thpok locus may therefore be an independent event from commitment to the cytotoxic lineage. These findings imply that long-lasting TCR signals are needed to establish stable Thpok expression activity to commit to helper T-cell fate and that full commitment to the helper lineage requires persistent reversal of silencer activity during a particular time window.
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Affiliation(s)
- Hirokazu Tanaka
- Laboratory for Transcriptional Regulation, RIKEN Research Center for Allergy and Immunology, Yokohama, Kanagawa 230-0045, Japan
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Xiong Y, Castro E, Yagi R, Zhu J, Lesourne R, Love PE, Feigenbaum L, Bosselut R. Thpok-independent repression of Runx3 by Gata3 during CD4+ T-cell differentiation in the thymus. Eur J Immunol 2013; 43:918-28. [PMID: 23310955 DOI: 10.1002/eji.201242944] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2012] [Revised: 11/27/2012] [Accepted: 01/07/2013] [Indexed: 11/06/2022]
Abstract
CD4(+) helper T cells are essential for immune responses and differentiate in the thymus from CD4(+) CD8(+) "double-positive" (DP) thymocytes. The transcription factor Runx3 inhibits CD4(+) T-cell differentiation by repressing Cd4 gene expression; accordingly, Runx3 is not expressed in DP thymocytes or developing CD4(+) T cells. The transcription factor Thpok is upregulated in CD4-differentiating thymocytes and required to repress Runx3. However, how Runx3 is controlled at early stages of CD4(+) T-cell differentiation, before the onset of Thpok expression, remains unknown. Here we show that Gata3, a transcription factor preferentially and transiently upregulated by CD4(+) T-cell precursors, represses Runx3 and binds the Runx3 locus in vivo. Accordingly, we show that high-level Gata3 expression and expression of Runx3 are mutually exclusive. Furthermore, whereas Runx3 represses Cd4, we show that Gata3 promotes Cd4 expression in Thpok-deficient thymocytes. Thus, in addition to its previously documented role in promoting CD4-lineage gene-expression, Gata3 represses CD8-lineage gene expression. These findings identify Gata3 as a critical pivot of CD4-CD8 lineage differentiation.
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Affiliation(s)
- Yumei Xiong
- Laboratory of Immune Cell Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda 20892-4259, MD, USA
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21
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McCaughtry TM, Etzensperger R, Alag A, Tai X, Kurtulus S, Park JH, Grinberg A, Love P, Feigenbaum L, Erman B, Singer A. Conditional deletion of cytokine receptor chains reveals that IL-7 and IL-15 specify CD8 cytotoxic lineage fate in the thymus. ACTA ACUST UNITED AC 2012; 209:2263-76. [PMID: 23109710 PMCID: PMC3501363 DOI: 10.1084/jem.20121505] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The thymus generates T cells with diverse specificities and functions. To assess the contribution of cytokine receptors to the differentiation of T cell subsets in the thymus, we constructed conditional knockout mice in which IL-7Rα or common cytokine receptor γ chain (γ(c)) genes were deleted in thymocytes just before positive selection. We found that γ(c) expression was required to signal the differentiation of MHC class I (MHC-I)-specific thymocytes into CD8(+) cytotoxic lineage T cells and into invariant natural killer T cells but did not signal the differentiation of MHC class II (MHC-II)-specific thymocytes into CD4(+) T cells, even into regulatory Foxp3(+)CD4(+) T cells which require γ(c) signals for survival. Importantly, IL-7 and IL-15 were identified as the cytokines responsible for CD8(+) cytotoxic T cell lineage specification in vivo. Additionally, we found that small numbers of aberrant CD8(+) T cells expressing Runx3d could arise without γ(c) signaling, but these cells were developmentally arrested before expressing cytotoxic lineage genes. Thus, γ(c)-transduced cytokine signals are required for cytotoxic lineage specification in the thymus and for inducing the differentiation of MHC-I-selected thymocytes into functionally mature T cells.
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Affiliation(s)
- Tom M McCaughtry
- Experimental Immunology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
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Xiong Y, Bosselut R. CD4-CD8 differentiation in the thymus: connecting circuits and building memories. Curr Opin Immunol 2012; 24:139-45. [PMID: 22387323 PMCID: PMC3773541 DOI: 10.1016/j.coi.2012.02.002] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2011] [Revised: 01/22/2012] [Accepted: 02/06/2012] [Indexed: 10/28/2022]
Abstract
The proper choice of the CD4-helper or CD8-cytotoxic lineages by developing T cells is crucial for the generation of an antigen-responsive and functionally fit T cell repertoire. Here we present a brief overview of the transcriptional control of this process, with emphasis on two issues. The study of Cd4 expression, that had previously generated important paradigms for transcriptional regulation in eukaryotic cells, now brings new twists to the concept of 'epigenetic memory'. And connections are emerging between transcriptional regulators critical for commitment to either lineage. The present review attempts to integrate these findings and discusses the still elusive mechanisms that match CD4-CD8 lineage differentiation to MHC specificity.
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Affiliation(s)
- Yumei Xiong
- Laboratory of Immune Cell Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
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Adoro S, Park JH, Singer A. Coreceptor gene "imprinting:" a genetic solution to a developmental dilemma in T cells. Cell Cycle 2012; 11:833-4. [PMID: 22333594 DOI: 10.4161/cc.11.5.19596] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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