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Modulating T Cell Responses by Targeting CD3. Cancers (Basel) 2023; 15:cancers15041189. [PMID: 36831533 PMCID: PMC9953819 DOI: 10.3390/cancers15041189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Revised: 01/27/2023] [Accepted: 02/11/2023] [Indexed: 02/16/2023] Open
Abstract
Harnessing the immune system to fight cancer has become a reality with the clinical success of immune-checkpoint blockade (ICB) antibodies against PD(L)-1 and CTLA-4. However, not all cancer patients respond to ICB. Thus, there is a need to modulate the immune system through alternative strategies for improving clinical responses to ICB. The CD3-T cell receptor (TCR) is the canonical receptor complex on T cells. It provides the "first signal" that initiates T cell activation and determines the specificity of the immune response. The TCR confers the binding specificity whilst the CD3 subunits facilitate signal transduction necessary for T cell activation. While the mechanisms through which antigen sensing and signal transduction occur in the CD3-TCR complex are still under debate, recent revelations regarding the intricate 3D structure of the CD3-TCR complex might open the possibility of modulating its activity by designing targeted drugs and tools, including aptamers. In this review, we summarize the basis of CD3-TCR complex assembly and survey the clinical and preclinical therapeutic tools available to modulate CD3-TCR function for potentiating cancer immunotherapy.
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2
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Zou Z, Zhang Y, Huang Y, Wang J, Min W, Xiang M, Zhou B, Li T. Integrated genome-wide methylation and expression analyses provide predictors of diagnosis and early response to antidepressant in panic disorder. J Affect Disord 2023; 322:146-155. [PMID: 36356898 DOI: 10.1016/j.jad.2022.10.049] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Revised: 08/29/2022] [Accepted: 10/31/2022] [Indexed: 11/09/2022]
Abstract
BACKGROUND We investigated differentially methylated and expressed genes between panic disorder (PD) and healthy controls (HCs) to determine whether DNA methylation and expression level of candidate genes can be used as biomarkers for diagnosis and early response. METHODS Illumina infiniun Methylation EPIC (850 k) Beadchip for genome-wide methylation screening and mRNA sequencing was conducted in a discovery set (30 patients with PD and 30 matched HCs). The candidate gene loci methylation and expression were verified in an independent validation sample (101 PD patients and 107 HCs). RESULTS In the discovery set, there were 3613 differentially methylated cytosine phosphate guanosine sites and these differential methylation positions were located within 1938 unique genes, including 1758 hypermethylated genes, 150 hypomethylated genes, and the coexistence of hypermethylation and hypomethylation sites were found in 30 genes. There were 1111 differential transcripts in PD compared to normal controls (850 down-regulated and 261 up-regulated). Further, 212 differentially expressed genes were screened (40 up-regulated and 172 down-regulated). In the validation set, compared with HCs, there was no significant difference in DNA methylation level of Casitas B-lineage lymphoma (CBL) gene loci (cg07123846). The expression level of CBL gene in PD patients was lower (vs. HCs). After four weeks' treatment, the baseline expression level of CBL gene in the responders was higher than nonresponders. LIMITATIONS The sample size was limited. We only chose CBL as a candidate gene. Follow-up periods were short. CONCLUSIONS There are differences in genome-wide DNA methylation and mRNA expression between PD patients and HCs. The changes in expression level of CBL gene may be an important molecular marker for PD diagnosis and early response.
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Affiliation(s)
- Zhili Zou
- Provincial Center for Mental Health, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Chengdu 610072, China; Mental Health Center, West China University Hospital, Sichuan University, Chengdu 610041, China; Key Laboratory of psychosomatic medicine, Chinese Academy of Medical Sciences, Chengdu 610072, China.
| | - Yuan Zhang
- Personalized Drug Therapy Key Laboratory of Sichuan Province, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Chengdu 610072, China
| | - Yulan Huang
- Provincial Center for Mental Health, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Chengdu 610072, China
| | - Jinyu Wang
- Provincial Center for Mental Health, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Chengdu 610072, China
| | - Wenjiao Min
- Provincial Center for Mental Health, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Chengdu 610072, China
| | - Miao Xiang
- Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu 611731, China
| | - Bo Zhou
- Provincial Center for Mental Health, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Chengdu 610072, China; Key Laboratory of psychosomatic medicine, Chinese Academy of Medical Sciences, Chengdu 610072, China.
| | - Tao Li
- Mental Health Center, West China University Hospital, Sichuan University, Chengdu 610041, China.
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3
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Tyagi T, Jain K, Yarovinsky TO, Chiorazzi M, Du J, Castro C, Griffin J, Korde A, Martin KA, Takyar SS, Flavell RA, Patel AA, Hwa J. Platelet-derived TLT-1 promotes tumor progression by suppressing CD8+ T cells. J Exp Med 2023; 220:213620. [PMID: 36305874 DOI: 10.1084/jem.20212218] [Citation(s) in RCA: 14] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Revised: 04/25/2022] [Accepted: 10/05/2022] [Indexed: 01/19/2023] Open
Abstract
Current understanding of tumor immunosuppressive mechanisms forms the basis for modern day immunotherapies. Immunoregulatory role of platelets in cancer remains largely elusive. Platelets from non-small cell lung cancer (NSCLC) patients revealed a distinct activation phenotype. TREM-like transcript 1 (TLT-1), a platelet protein, was increased along with enhanced extracellular release from NSCLC platelets. The increased platelet TLT-1 was also evident in humanized mice with patient-derived tumors. In immunocompetent mice with syngeneic tumors, TLT-1 binding to T cells, in vivo, led to suppression of CD8 T cells, promoting tumor growth. We identified direct interaction between TLT-1 and CD3ε on T cells, implicating the NF-κB pathway in CD8 T cell suppression. Anti-TLT-1 antibody rescued patients' T cells from platelet-induced suppression ex vivo and reduced tumors in mice in vivo. Clinically, higher TLT-1 correlated with reduced survival of NSCLC patients. Our findings thus identify TLT-1 as a platelet-derived immunosuppressor that suppresses CD8 T cells and demonstrate its therapeutic and prognostic significance in cancer.
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Affiliation(s)
- Tarun Tyagi
- Yale Cardiovascular Research Center, Department of Internal Medicine, Yale School of Medicine, New Haven, CT
| | - Kanika Jain
- Yale Cardiovascular Research Center, Department of Internal Medicine, Yale School of Medicine, New Haven, CT
| | - Timur O Yarovinsky
- Yale Cardiovascular Research Center, Department of Internal Medicine, Yale School of Medicine, New Haven, CT
| | - Michael Chiorazzi
- Department of Immunobiology, Howard Hughes Medical Institute, Yale School of Medicine, New Haven, CT.,Yale Cancer Center, New Haven, CT
| | - Jing Du
- Yale Cardiovascular Research Center, Department of Internal Medicine, Yale School of Medicine, New Haven, CT
| | - Cecilia Castro
- Department of Biochemistry, Cambridge University, Cambridge, UK
| | - Jules Griffin
- Department of Biochemistry, Cambridge University, Cambridge, UK
| | - Asawari Korde
- Pulmonary Critical Care, Yale Internal Medicine, New Haven, CT
| | - Kathleen A Martin
- Yale Cardiovascular Research Center, Department of Internal Medicine, Yale School of Medicine, New Haven, CT
| | - Shervin S Takyar
- Pulmonary Critical Care, Yale Internal Medicine, New Haven, CT.,Yale Cancer Center, New Haven, CT
| | - Richard A Flavell
- Department of Immunobiology, Howard Hughes Medical Institute, Yale School of Medicine, New Haven, CT.,Yale Cancer Center, New Haven, CT
| | - Abhijit A Patel
- Yale Therapeutic Radiology, Yale Cancer Center, New Haven, CT.,Yale Cancer Center, New Haven, CT
| | - John Hwa
- Yale Cardiovascular Research Center, Department of Internal Medicine, Yale School of Medicine, New Haven, CT.,Yale Cancer Center, New Haven, CT
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4
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Boehme L, Roels J, Taghon T. Development of γδ T cells in the thymus - A human perspective. Semin Immunol 2022; 61-64:101662. [PMID: 36374779 DOI: 10.1016/j.smim.2022.101662] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Accepted: 10/05/2022] [Indexed: 12/14/2022]
Abstract
γδ T cells are increasingly emerging as crucial immune regulators that can take on innate and adaptive roles in the defence against pathogens. Although they arise within the thymus from the same hematopoietic precursors as conventional αβ T cells, the development of γδ T cells is less well understood. In this review, we focus on summarising the current state of knowledge about the cellular and molecular processes involved in the generation of γδ T cells in human.
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Affiliation(s)
- Lena Boehme
- Department of Diagnostic Sciences, Ghent University, Ghent, Belgium
| | - Juliette Roels
- Department of Diagnostic Sciences, Ghent University, Ghent, Belgium
| | - Tom Taghon
- Department of Diagnostic Sciences, Ghent University, Ghent, Belgium; Cancer Research Institute Ghent (CRIG), Ghent, Belgium.
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5
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A set point in the selection of the αβTCR T cell repertoire imposed by pre-TCR signaling strength. Proc Natl Acad Sci U S A 2022; 119:e2201907119. [PMID: 35617435 DOI: 10.1073/pnas.2201907119] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
SignificanceThe ability of the T cell receptor (TCR) to convey signals of different intensity is essential for the generation of a diverse, protecting, and self-tolerant T cell repertoire. We provide evidence that pre-TCR signaling during the first stage of T cell differentiation, thought to only check for in-frame rearrangement of TCRβ gene segments, determines the degree of diversity in a signaling intensity-dependent manner and controls the diversity of the TCR repertoire available for subsequent thymic positive and negative selection. Pre-TCR signaling intensity is regulated by the transmembrane region of its associated CD3ζ chains, possibly by organizing pre-TCRs into nanoclusters. Our data provide insights into immune receptor signaling mechanisms and reveal an additional checkpoint of T cell repertoire diversity.
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6
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Huseby ES, Teixeiro E. The perception and response of T cells to a changing environment are based on the law of initial value. Sci Signal 2022; 15:eabj9842. [PMID: 35639856 PMCID: PMC9290192 DOI: 10.1126/scisignal.abj9842] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
αβ T cells are critical components of the adaptive immune system and are capable of inducing sterilizing immunity after pathogen infection and eliminating transformed tumor cells. The development and function of T cells are controlled through the T cell antigen receptor, which recognizes peptides displayed on major histocompatibility complex (MHC) molecules. Here, we review how T cells generate the ability to recognize self-peptide-bound MHC molecules and use signals derived from these interactions to instruct cellular development, activation thresholds, and functional specialization in the steady state and during immune responses. We argue that the basic tenants of T cell development and function follow Weber-Fetcher's law of just noticeable differences and Wilder's law of initial value. Together, these laws argue that the ability of a system to respond and the quality of that response are scalable to the basal state of that system. Manifestation of these laws in T cells generates clone-specific activation thresholds that are based on perceivable differences between homeostasis and pathogen encounter (self versus nonself discrimination), as well as poised states for subsequent differentiation into specific effector cell lineages.
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Affiliation(s)
- Eric S. Huseby
- Department of Pathology, University of Massachusetts Medical School, Worcester, MA 01655, USA
| | - Emma Teixeiro
- Department of Molecular Microbiology and Immunology, School of Medicine, University of Missouri, Columbia, MO 65212, USA
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7
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Tyagi A, Wu SY, Sharma S, Wu K, Zhao D, Deshpande R, Singh R, Li W, Topaloglu U, Ruiz J, Watabe K. Exosomal miR-4466 from nicotine-activated neutrophils promotes tumor cell stemness and metabolism in lung cancer metastasis. Oncogene 2022; 41:3079-3092. [PMID: 35461327 PMCID: PMC9135627 DOI: 10.1038/s41388-022-02322-w] [Citation(s) in RCA: 27] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Revised: 04/07/2022] [Accepted: 04/11/2022] [Indexed: 01/28/2023]
Abstract
Smoking is associated with lung cancer and has a profound impact on tumor immunity. Nicotine, the addictive and non-carcinogenic smoke component, influences various brain cells and the immune system. However, how long-term use of nicotine affects brain metastases is poorly understood. We, therefore, examined the mechanism by which nicotine promotes lung cancer brain metastasis. In this study, we conducted a retrospective analysis of 810 lung cancer patients with smoking history and assessed brain metastasis. We found that current smoker's lung cancer patients have significantly higher brain metastatic incidence compared to the never smokers. We also found that chronic nicotine exposure recruited STAT3-activated N2-neutrophils within the brain pre-metastatic niche and secreted exosomal miR-4466 which promoted stemness and metabolic switching via SKI/SOX2/CPT1A axis in the tumor cells in the brain thereby enabling metastasis. Importantly, exosomal miR-4466 levels were found to be elevated in serum/urine of cancer-free subjects with a smoking history and promote tumor growth in vivo, suggesting that exosomal miR-4466 may serve as a promising prognostic biomarker for predicting increased risk of metastatic disease among smoker(s). Our findings suggest a novel pro-metastatic role of nicotine-induced N2-neutrophils in the progression of brain metastasis. We also demonstrated that inhibiting nicotine-induced STAT3-mediated neutrophil polarization effectively abrogated brain metastasis in vivo. Our results revealed a novel mechanistic insight on how chronic nicotine exposure contributes to worse clinical outcome of metastatic lung cancer and implicated the risk of using nicotine gateway for smoking cessation in cancer patients.
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Affiliation(s)
- Abhishek Tyagi
- Department of Cancer Biology, Wake Forest University School of Medicine, Winston-Salem, NC, 27157, United States
| | - Shih-Ying Wu
- Department of Cancer Biology, Wake Forest University School of Medicine, Winston-Salem, NC, 27157, United States
| | - Sambad Sharma
- Department of Cancer Biology, Wake Forest University School of Medicine, Winston-Salem, NC, 27157, United States
| | - Kerui Wu
- Department of Cancer Biology, Wake Forest University School of Medicine, Winston-Salem, NC, 27157, United States
| | - Dan Zhao
- Department of Cancer Biology, Wake Forest University School of Medicine, Winston-Salem, NC, 27157, United States
| | - Ravindra Deshpande
- Department of Cancer Biology, Wake Forest University School of Medicine, Winston-Salem, NC, 27157, United States
| | - Ravi Singh
- Department of Cancer Biology, Wake Forest University School of Medicine, Winston-Salem, NC, 27157, United States
| | - Wencheng Li
- Department of Cancer Biology, Wake Forest University School of Medicine, Winston-Salem, NC, 27157, United States
| | - Umit Topaloglu
- Department of Cancer Biology, Wake Forest University School of Medicine, Winston-Salem, NC, 27157, United States
| | - Jimmy Ruiz
- Department of Cancer Biology, Wake Forest University School of Medicine, Winston-Salem, NC, 27157, United States
| | - Kounosuke Watabe
- Department of Cancer Biology, Wake Forest University School of Medicine, Winston-Salem, NC, 27157, United States.
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8
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Selective multi-kinase inhibition sensitizes mesenchymal pancreatic cancer to immune checkpoint blockade by remodeling the tumor microenvironment. NATURE CANCER 2022; 3:318-336. [PMID: 35122074 PMCID: PMC7612546 DOI: 10.1038/s43018-021-00326-1] [Citation(s) in RCA: 35] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/05/2020] [Accepted: 12/13/2021] [Indexed: 12/14/2022]
Abstract
KRAS-mutant pancreatic ductal adenocarcinoma (PDAC) is highly immunosuppressive and resistant to targeted and immunotherapies. Among the different PDAC subtypes, basal-like mesenchymal PDAC, which is driven by allelic imbalance, increased gene dosage and subsequent high expression levels of oncogenic KRAS, shows the most aggressive phenotype and strongest therapy resistance. In the present study, we performed a systematic high-throughput combination drug screen and identified a synergistic interaction between the MEK inhibitor trametinib and the multi-kinase inhibitor nintedanib, which targets KRAS-directed oncogenic signaling in mesenchymal PDAC. This combination treatment induces cell-cycle arrest and cell death, and initiates a context-dependent remodeling of the immunosuppressive cancer cell secretome. Using a combination of single-cell RNA-sequencing, CRISPR screens and immunophenotyping, we show that this combination therapy promotes intratumor infiltration of cytotoxic and effector T cells, which sensitizes mesenchymal PDAC to PD-L1 immune checkpoint inhibition. Overall, our results open new avenues to target this aggressive and therapy-refractory mesenchymal PDAC subtype.
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9
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Boccasavia VL, Bovolenta ER, Villanueva A, Borroto A, Oeste CL, van Santen HM, Prieto C, Alonso-López D, Diaz-Muñoz MD, Batista FD, Alarcón B. Antigen presentation between T cells drives Th17 polarization under conditions of limiting antigen. Cell Rep 2021; 34:108861. [PMID: 33730591 PMCID: PMC7972993 DOI: 10.1016/j.celrep.2021.108861] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Revised: 12/29/2020] [Accepted: 02/19/2021] [Indexed: 02/06/2023] Open
Abstract
T cells form immunological synapses with professional antigen-presenting cells (APCs) resulting in T cell activation and the acquisition of peptide antigen-MHC (pMHC) complexes from the plasma membrane of the APC. They thus become APCs themselves. We investigate the functional outcome of T-T cell antigen presentation by CD4 T cells and find that the antigen-presenting T cells (Tpres) predominantly differentiate into regulatory T cells (Treg), whereas T cells that have been stimulated by Tpres cells predominantly differentiate into Th17 pro-inflammatory cells. Using mice deficient in pMHC uptake by T cells, we show that T-T antigen presentation is important for the development of experimental autoimmune encephalitis and Th17 cell differentiation in vivo. By varying the professional APC:T cell ratio, we can modulate Treg versus Th17 differentiation in vitro and in vivo, suggesting that T-T antigen presentation underlies proinflammatory responses in conditions of antigen scarcity.
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Affiliation(s)
- Viola L Boccasavia
- Interactions with the Environment Program, Centro Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Científicas, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Elena R Bovolenta
- Interactions with the Environment Program, Centro Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Científicas, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Ana Villanueva
- Interactions with the Environment Program, Centro Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Científicas, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Aldo Borroto
- Interactions with the Environment Program, Centro Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Científicas, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Clara L Oeste
- Interactions with the Environment Program, Centro Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Científicas, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Hisse M van Santen
- Interactions with the Environment Program, Centro Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Científicas, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Cristina Prieto
- Interactions with the Environment Program, Centro Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Científicas, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Diego Alonso-López
- Centro de Investigación del Cáncer, Instituto de Biología Molecular y Celular del Cancer, and Centro de Investigación Biomédica en Red de Cáncer (CIBERONC), CSIC-University of Salamanca, Campus Unamuno s/n, 37007 Salamanca, Spain
| | - Manuel D Diaz-Muñoz
- Center for Physiopathology Toulouse-Purpan, INSERM UMR1043/CNRS UMR5282, CHU Purpan, BP3028, 31024 Toulouse, France
| | | | - Balbino Alarcón
- Interactions with the Environment Program, Centro Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Científicas, Universidad Autónoma de Madrid, 28049 Madrid, Spain.
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10
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Kim JY, Choi JK, Jung H. Genome-wide methylation patterns predict clinical benefit of immunotherapy in lung cancer. Clin Epigenetics 2020; 12:119. [PMID: 32762727 PMCID: PMC7410160 DOI: 10.1186/s13148-020-00907-4] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Accepted: 07/20/2020] [Indexed: 02/06/2023] Open
Abstract
Background It is crucial to unravel molecular determinants of responses to immune checkpoint blockade (ICB) therapy because only a small subset of advanced non-small cell lung cancer (NSCLC) patients responds to ICB therapy. Previous studies were concentrated on genomic and transcriptomic markers (e.g., mutation burden and immune gene expression). However, these markers are not sufficient to accurately predict a response to ICB therapy. Results Here, we analyzed DNA methylomes of 141 advanced NSCLC samples subjected to ICB therapy (i.e., anti-programmed death-1) from two independent cohorts (60 and 81 patients from our and IDIBELL cohorts). Integrative analysis of patients with matched transcriptome data in our cohort (n = 28) at pathway level revealed significant overlaps between promoter hypermethylation and transcriptional repression in nonresponders relative to responders. Fifteen immune-related pathways, including interferon signaling, were identified to be enriched for both hypermethylation and repression. We built a reliable prognostic risk model based on eight genes using LASSO model and successfully validated the model in independent cohorts. Furthermore, we found 30 survival-associated molecular interaction networks, in which two or three hypermethylated genes showed significant mutual exclusion across nonresponders. Conclusions Our study demonstrates that methylation patterns can provide insight into molecular determinants underlying the clinical benefit of ICB therapy.
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Affiliation(s)
- Jeong Yeon Kim
- Department of Bio and Brain Engineering, KAIST, Daejeon, 34141, Republic of Korea
| | - Jung Kyoon Choi
- Department of Bio and Brain Engineering, KAIST, Daejeon, 34141, Republic of Korea. .,Penta Medix Co., Ltd., Seongnam-si, Gyeongi-do, 13449, Republic of Korea.
| | - Hyunchul Jung
- Department of Bio and Brain Engineering, KAIST, Daejeon, 34141, Republic of Korea. .,Cancer Ageing and Somatic Mutation Programme, Wellcome Sanger Institute, Cambridge, UK.
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11
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Noncanonical binding of Lck to CD3ε promotes TCR signaling and CAR function. Nat Immunol 2020; 21:902-913. [PMID: 32690949 DOI: 10.1038/s41590-020-0732-3] [Citation(s) in RCA: 60] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2019] [Accepted: 06/08/2020] [Indexed: 11/09/2022]
Abstract
Initiation of T cell antigen receptor (TCR) signaling involves phosphorylation of CD3 cytoplasmic tails by the tyrosine kinase Lck. How Lck is recruited to the TCR to initiate signaling is not well known. We report a previously unknown binding motif in the CD3ε cytoplasmic tail that interacts in a noncanonical mode with the Lck SH3 domain: the receptor kinase (RK) motif. The RK motif is accessible only upon TCR ligation, demonstrating how ligand binding leads to Lck recruitment. Binding of the Lck SH3 domain to the exposed RK motif resulted in local augmentation of Lck activity, CD3 phosphorylation, T cell activation and thymocyte development. Introducing the RK motif into a well-characterized 41BB-based chimeric antigen receptor enhanced its antitumor function in vitro and in vivo. Our findings underscore how a better understanding of the functioning of the TCR might promote rational improvement of chimeric antigen receptor design for the treatment of cancer.
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12
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Martín-Leal A, Blanco R, Casas J, Sáez ME, Rodríguez-Bovolenta E, de Rojas I, Drechsler C, Real LM, Fabrias G, Ruíz A, Castro M, Schamel WW, Alarcón B, van Santen HM, Mañes S. CCR5 deficiency impairs CD4 + T-cell memory responses and antigenic sensitivity through increased ceramide synthesis. EMBO J 2020; 39:e104749. [PMID: 32525588 PMCID: PMC7396835 DOI: 10.15252/embj.2020104749] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2020] [Revised: 05/12/2020] [Accepted: 05/14/2020] [Indexed: 12/24/2022] Open
Abstract
CCR5 is not only a coreceptor for HIV‐1 infection in CD4+ T cells, but also contributes to their functional fitness. Here, we show that by limiting transcription of specific ceramide synthases, CCR5 signaling reduces ceramide levels and thereby increases T‐cell antigen receptor (TCR) nanoclustering in antigen‐experienced mouse and human CD4+ T cells. This activity is CCR5‐specific and independent of CCR5 co‐stimulatory activity. CCR5‐deficient mice showed reduced production of high‐affinity class‐switched antibodies, but only after antigen rechallenge, which implies an impaired memory CD4+ T‐cell response. This study identifies a CCR5 function in the generation of CD4+ T‐cell memory responses and establishes an antigen‐independent mechanism that regulates TCR nanoclustering by altering specific lipid species.
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Affiliation(s)
- Ana Martín-Leal
- Department of Immunology and Oncology, Centro Nacional de Biotecnología (CNB/CSIC), Madrid, Spain
| | - Raquel Blanco
- Department of Immunology and Oncology, Centro Nacional de Biotecnología (CNB/CSIC), Madrid, Spain
| | - Josefina Casas
- Department of Biological Chemistry, Institute of Advanced Chemistry of Catalonia (IQAC-CSIC), Barcelona, Spain.,CIBER Liver and Digestive Diseases (CIBER-EDH), Instituto de Salud Carlos III, Madrid, Spain
| | - María E Sáez
- Centro Andaluz de Estudios Bioinformáticos (CAEBi), Seville, Spain
| | - Elena Rodríguez-Bovolenta
- Department of Cell Biology and Immunology, Centro de Biología Molecular Severo Ochoa (CBMSO/CSIC), Madrid, Spain
| | - Itziar de Rojas
- Alzheimer Research Center, Memory Clinic of the Fundació ACE, Institut Català de Neurociències Aplicades, Barcelona, Spain
| | - Carina Drechsler
- Signaling Research Centers BIOSS and CIBSS, University of Freiburg, Freiburg, Germany.,Department of Immunology, Faculty of Biology, University of Freiburg, Freiburg, Germany.,Institute for Pharmaceutical Sciences, University of Freiburg, Freiburg, Germany
| | - Luis Miguel Real
- Unit of Infectious Diseases and Microbiology, Hospital Universitario de Valme, Seville, Spain.,Department of Biochemistry, Molecular Biology and Immunology, School of Medicine, Universidad de Málaga, Málaga, Spain
| | - Gemma Fabrias
- Department of Biological Chemistry, Institute of Advanced Chemistry of Catalonia (IQAC-CSIC), Barcelona, Spain.,CIBER Liver and Digestive Diseases (CIBER-EDH), Instituto de Salud Carlos III, Madrid, Spain
| | - Agustín Ruíz
- Alzheimer Research Center, Memory Clinic of the Fundació ACE, Institut Català de Neurociències Aplicades, Barcelona, Spain.,CIBER Enfermedades Neurodegenerativas (CIBERNED), Instituto de Salud Carlos III, Madrid, Spain
| | - Mario Castro
- Interdisciplinary Group of Complex Systems, Escuela Técnica Superior de Ingeniería, Universidad Pontificia Comillas, Madrid, Spain
| | - Wolfgang Wa Schamel
- Signaling Research Centers BIOSS and CIBSS, University of Freiburg, Freiburg, Germany.,Department of Immunology, Faculty of Biology, University of Freiburg, Freiburg, Germany.,Centre for Chronic Immunodeficiency (CCI), University of Freiburg, Freiburg, Germany
| | - Balbino Alarcón
- Department of Cell Biology and Immunology, Centro de Biología Molecular Severo Ochoa (CBMSO/CSIC), Madrid, Spain
| | - Hisse M van Santen
- Department of Cell Biology and Immunology, Centro de Biología Molecular Severo Ochoa (CBMSO/CSIC), Madrid, Spain
| | - Santos Mañes
- Department of Immunology and Oncology, Centro Nacional de Biotecnología (CNB/CSIC), Madrid, Spain
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13
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Martínez-Riaño A, Bovolenta ER, Boccasavia VL, Ponomarenko J, Abia D, Oeste CL, Fresno M, van Santen HM, Alarcon B. RRAS2 shapes the TCR repertoire by setting the threshold for negative selection. J Exp Med 2019; 216:2427-2447. [PMID: 31324740 PMCID: PMC6781009 DOI: 10.1084/jem.20181959] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Revised: 03/29/2019] [Accepted: 06/19/2019] [Indexed: 12/26/2022] Open
Abstract
RRAS2 is involved in setting the threshold for negative selection of T cells in the thymus. In its absence, most autoreactive T cells are eliminated, and, consequently, mice become resistant to development of autoimmune diseases in experimental models. Signal strength controls the outcome of αβ T cell selection in the thymus, resulting in death if the affinity of the rearranged TCR is below the threshold for positive selection, or if the affinity of the TCR is above the threshold for negative selection. Here we show that deletion of the GTPase RRAS2 results in exacerbated negative selection and above-normal expression of positive selection markers. Furthermore, Rras2−/− mice are resistant to autoimmunity both in a model of inflammatory bowel disease (IBD) and in a model of myelin oligodendrocyte glycoprotein (MOG)–induced experimental autoimmune encephalomyelitis (EAE). We show that MOG-specific T cells in Rras2−/− mice have reduced affinity for MOG/I-Ab tetramers, suggesting that enhanced negative selection leads to selection of TCRs with lower affinity for the self-MOG peptide. An analysis of the TCR repertoire shows alterations that mostly affect the TCRα variable (TRAV) locus with specific VJ combinations and CDR3α sequences that are absent in Rras2−/− mice, suggesting their involvement in autoimmunity.
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Affiliation(s)
- Ana Martínez-Riaño
- Departamento de Biología Celular e Inmunología, Centro Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Científicas, Universidad Autónoma de Madrid, Madrid, Spain
| | - Elena R Bovolenta
- Departamento de Biología Celular e Inmunología, Centro Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Científicas, Universidad Autónoma de Madrid, Madrid, Spain
| | - Viola L Boccasavia
- Departamento de Biología Celular e Inmunología, Centro Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Científicas, Universidad Autónoma de Madrid, Madrid, Spain
| | - Julia Ponomarenko
- Centre for Genomic Regulation, The Barcelona Institute of Science and Technology, Barcelona, Spain.,Universitat Pompeu Fabra, Barcelona, Spain
| | - David Abia
- Servicio de Bioinformática, Centro Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Científicas, Universidad Autónoma de Madrid, Madrid, Spain
| | - Clara L Oeste
- Departamento de Biología Celular e Inmunología, Centro Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Científicas, Universidad Autónoma de Madrid, Madrid, Spain
| | - Manuel Fresno
- Departamento de Biología Celular e Inmunología, Centro Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Científicas, Universidad Autónoma de Madrid, Madrid, Spain
| | - Hisse M van Santen
- Departamento de Biología Celular e Inmunología, Centro Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Científicas, Universidad Autónoma de Madrid, Madrid, Spain
| | - Balbino Alarcon
- Departamento de Biología Celular e Inmunología, Centro Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Científicas, Universidad Autónoma de Madrid, Madrid, Spain
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14
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Graf R, Seagal J, Otipoby KL, Lam KP, Ayoub S, Zhang B, Sander S, Chu VT, Rajewsky K. BCR-dependent lineage plasticity in mature B cells. Science 2019; 363:748-753. [PMID: 30765568 DOI: 10.1126/science.aau8475] [Citation(s) in RCA: 55] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2018] [Accepted: 01/17/2019] [Indexed: 12/17/2022]
Abstract
B2 cells engage in classical antibody responses, whereas B1 cells are considered carriers of innate immunity, biased toward recognizing epitopes present on the surfaces of common pathogens and self antigens. To explore the role of B cell antigen receptor (BCR) specificity in driving B1 cell differentiation, we developed a transgenic system allowing us to change BCR specificity in B cells in an inducible and programmed manner. Mature B2 cells differentiated into bona fide B1 cells upon acquisition of a B1 cell-typical self-reactive BCR through a phase of proliferative expansion. Thus, B2 cells have B1 cell differentiation potential in addition to their classical capacity to differentiate into memory and plasma cells, and B1 differentiation can be instructed by BCR-mediated self-reactivity, in the absence of B1-lineage precommitment.
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Affiliation(s)
- Robin Graf
- Immune Regulation and Cancer, Max Delbrück Center for Molecular Medicine in the Helmholtz Association, 13125 Berlin, Germany.
| | - Jane Seagal
- Program in Cellular and Molecular Medicine, Children's Hospital, and Immune Disease Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Kevin L Otipoby
- Program in Cellular and Molecular Medicine, Children's Hospital, and Immune Disease Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Kong-Peng Lam
- Institute for Genetics, University of Cologne, 50674 Cologne, Germany
| | - Salah Ayoub
- Systems Biology of Gene Regulatory Elements, Max Delbrück Center for Molecular Medicine in the Helmholtz Association Berlin, 13125 Berlin, Germany
| | - Baochun Zhang
- Program in Cellular and Molecular Medicine, Children's Hospital, and Immune Disease Institute, Harvard Medical School, Boston, MA 02115, USA.,Department of Medical Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02215, USA
| | - Sandrine Sander
- Immune Regulation and Cancer, Max Delbrück Center for Molecular Medicine in the Helmholtz Association, 13125 Berlin, Germany.,Adaptive Immunity and Lymphoma, German Cancer Research Center / National Center for Tumor Diseases Heidelberg, 69120 Heidelberg, Germany
| | - Van Trung Chu
- Immune Regulation and Cancer, Max Delbrück Center for Molecular Medicine in the Helmholtz Association, 13125 Berlin, Germany.,Berlin Institute of Health, 10117 Berlin, Germany
| | - Klaus Rajewsky
- Immune Regulation and Cancer, Max Delbrück Center for Molecular Medicine in the Helmholtz Association, 13125 Berlin, Germany. .,Program in Cellular and Molecular Medicine, Children's Hospital, and Immune Disease Institute, Harvard Medical School, Boston, MA 02115, USA.,Institute for Genetics, University of Cologne, 50674 Cologne, Germany
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15
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Kato A, Takaori-Kondo A, Minato N, Hamazaki Y. CXCR3 high CD8 + T cells with naïve phenotype and high capacity for IFN-γ production are generated during homeostatic T-cell proliferation. Eur J Immunol 2018; 48:1663-1678. [PMID: 30058200 DOI: 10.1002/eji.201747431] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2017] [Revised: 07/17/2018] [Accepted: 07/26/2018] [Indexed: 12/17/2022]
Abstract
Naïve phenotype (NP) T cells spontaneously initiate homeostatic proliferation (HP) as T-cell output is reduced because of physiologic thymic involution with age. However, the effects of sustained HP on overall immune function are poorly understood. We demonstrated that the NP CD8+ T cell population in adult thymectomized mice showing accelerated HP has an increased capacity for TCR-mediated interferon-γ and tumor necrosis factor α production, which is attributed to an increase in CXCR3+ cells in the NP CD8+ T cell population. The CXCR3+ NP CD8+ T cells developed during persistent HP with a slow cell division rate, but rarely during robust antigen-driven proliferation with a fast cell division rate. In ontogeny, the proportions of CXCR3+ cells in the NP CD8+ T cell population showed a biphasic profile, which was high at the newborn and aged stages. Upon transfer, CXCR3+ NP CD8+ T cells, but not CXCR3- NP CD8+ T cells, potently enhanced Th17-mediated inflammatory tissue reactions in vivo. Furthermore, CXCR3high NP CD8+ T cells with similar features were also detected at variable levels in healthy human blood. These results suggest that CXCR3+ NP CD8+ T cells generated during physiological HP significantly impact overall immunity at the immunologically vulnerable neonatal and aged stages.
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Affiliation(s)
- Aiko Kato
- Department of Immunology and Cell Biology, Graduate School of Medicine, Kyoto University, Sakyo-ku, Kyoto, Japan.,Department of Hematology and Oncology, Graduate School of Medicine, Kyoto University, Sakyo-ku, Kyoto, Japan.,Center for iPS Cell Research and Application (CiRA), Laboratory of Immunobiology, Graduate School of Medicine, Kyoto University, Sakyo-ku, Kyoto, Japan
| | - Akifumi Takaori-Kondo
- Department of Hematology and Oncology, Graduate School of Medicine, Kyoto University, Sakyo-ku, Kyoto, Japan
| | - Nagahiro Minato
- Department of Immunology and Cell Biology, Graduate School of Medicine, Kyoto University, Sakyo-ku, Kyoto, Japan
| | - Yoko Hamazaki
- Department of Immunology and Cell Biology, Graduate School of Medicine, Kyoto University, Sakyo-ku, Kyoto, Japan.,Center for iPS Cell Research and Application (CiRA), Laboratory of Immunobiology, Graduate School of Medicine, Kyoto University, Sakyo-ku, Kyoto, Japan
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16
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Dunne PJ, Maher CO, Freeley M, Dunne K, Petrasca A, Orikiiriza J, Dunne MR, Reidy D, O'Dea S, Loy A, Woo J, Long A, Rogers TR, Mulcahy F, Doherty DG. CD3ε Expression Defines Functionally Distinct Subsets of Vδ1 T Cells in Patients With Human Immunodeficiency Virus Infection. Front Immunol 2018; 9:940. [PMID: 29770136 PMCID: PMC5940748 DOI: 10.3389/fimmu.2018.00940] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Accepted: 04/16/2018] [Indexed: 12/28/2022] Open
Abstract
Human γδ T cells expressing the Vδ1 T cell receptor (TCR) recognize self and microbial antigens and stress-inducible molecules in a major histocompatibility complex-unrestricted manner and are an important source of innate interleukin (IL)-17. Vδ1 T cells are expanded in the circulation and intestines of patients with human immunodeficiency virus (HIV) infection. In this study, we show that patients with HIV have elevated frequencies, but not absolute numbers, of circulating Vδ1 T cells compared to control subjects. This increase was most striking in the patients with Candida albicans co-infection. Using flow cytometry and confocal microscopy, we identify two populations of Vδ1 T cells, based on low and high expression of the ε chain of the CD3 protein complex responsible for transducing TCR-mediated signals (denoted CD3εlo and CD3εhi Vδ1 T cells). Both Vδ1 T cell populations expressed the CD3 ζ-chain, also used for TCR signaling. Using lines of Vδ1 T cells generated from healthy donors, we show that CD3ε can be transiently downregulated by activation but that its expression is restored over time in culture in the presence of exogenous IL-2. Compared to CD3εhi Vδ1 T cells, CD3εlo Vδ1 T cells more frequently expressed terminally differentiated phenotypes and the negative regulator of T cell activation, programmed death-1 (PD-1), but not lymphocyte-activation gene 3, and upon stimulation in vitro, only the CD3εhi subset of Vδ1 T cells, produced IL-17. Thus, while HIV can infect and kill IL-17-producing CD4+ T cells, Vδ1 T cells are another source of IL-17, but many of them exist in a state of exhaustion, mediated either by the induction of PD-1 or by downregulation of CD3ε expression.
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Affiliation(s)
- Pádraic J Dunne
- Discipline of Immunology, School of Medicine, Trinity Translational Medicine Institute, Trinity College Dublin, Dublin, Ireland
| | - Christina O Maher
- Discipline of Immunology, School of Medicine, Trinity Translational Medicine Institute, Trinity College Dublin, Dublin, Ireland
| | - Michael Freeley
- Discipline of Clinical Medicine, School of Medicine, Trinity Translational Medicine Institute, Trinity College Dublin, Dublin, Ireland
| | - Katie Dunne
- Discipline of Clinical Microbiology, School of Medicine, Trinity Translational Medicine Institute, Trinity College Dublin, Dublin, Ireland
| | - Andreea Petrasca
- Discipline of Immunology, School of Medicine, Trinity Translational Medicine Institute, Trinity College Dublin, Dublin, Ireland
| | - Judy Orikiiriza
- Discipline of Immunology, School of Medicine, Trinity Translational Medicine Institute, Trinity College Dublin, Dublin, Ireland
| | - Margaret R Dunne
- Discipline of Immunology, School of Medicine, Trinity Translational Medicine Institute, Trinity College Dublin, Dublin, Ireland
| | - Derval Reidy
- Genitourinary Infectious Diseases Department, St. James's Hospital, Dublin, Ireland
| | - Siobhan O'Dea
- Genitourinary Infectious Diseases Department, St. James's Hospital, Dublin, Ireland
| | - Aisling Loy
- Genitourinary Infectious Diseases Department, St. James's Hospital, Dublin, Ireland
| | - Jim Woo
- Genitourinary Infectious Diseases Department, St. James's Hospital, Dublin, Ireland
| | - Aideen Long
- Discipline of Clinical Medicine, School of Medicine, Trinity Translational Medicine Institute, Trinity College Dublin, Dublin, Ireland
| | - Thomas R Rogers
- Discipline of Clinical Microbiology, School of Medicine, Trinity Translational Medicine Institute, Trinity College Dublin, Dublin, Ireland
| | - Fiona Mulcahy
- Genitourinary Infectious Diseases Department, St. James's Hospital, Dublin, Ireland
| | - Derek G Doherty
- Discipline of Immunology, School of Medicine, Trinity Translational Medicine Institute, Trinity College Dublin, Dublin, Ireland
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17
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Ueda O, Wada NA, Kinoshita Y, Hino H, Kakefuda M, Ito T, Fujii E, Noguchi M, Sato K, Morita M, Tateishi H, Matsumoto K, Goto C, Kawase Y, Kato A, Hattori K, Nezu J, Ishiguro T, Jishage KI. Entire CD3ε, δ, and γ humanized mouse to evaluate human CD3-mediated therapeutics. Sci Rep 2017; 7:45839. [PMID: 28368009 PMCID: PMC5377452 DOI: 10.1038/srep45839] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2016] [Accepted: 03/06/2017] [Indexed: 01/22/2023] Open
Abstract
T cell–mediated immunotherapy is an attractive strategy for treatment in various disease areas. In this therapeutic approach, the CD3 complex is one of the key molecules to modulate T cell functions; however, in many cases, we cannot evaluate the drug candidates in animal experiments because the therapeutics, usually monoclonal antibodies specific to human CD3, cannot react to mouse endogenous Cd3. Although immunodeficient mice transfused with human hematopoietic stem or precursor cells, known as humanized mice, are available for these studies, mice humanized in this manner are not completely immune competent. In this study we have succeeded in establishing a novel mouse strain in which all the three components of the Cd3 complex — Cd3ε, Cd3δ, and Cd3γ — are replaced by their human counterparts, CD3E, CD3D, and CD3G. Basic immunological assessments have confirmed that this strain of human CD3 EDG–replaced mice are entirely immune competent, and we have also demonstrated that a bispecific antibody that simultaneously binds to human CD3 and a tumor-associated antigen (e.g. ERBB2 or GPC3) can be evaluated in human CD3 EDG–replaced mice engrafted with tumors. Our mouse model provides a novel means to evaluate the in vivo efficacy of human CD3–mediated therapy.
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Affiliation(s)
- Otoya Ueda
- Chugai Pharmaceutical Co., Ltd., Research Division, Fuji Gotemba Research Labs., 1-135, Komakado, Gotemba, Shizuoka, Japan
| | - Naoko A Wada
- Chugai Pharmaceutical Co., Ltd., Research Division, Fuji Gotemba Research Labs., 1-135, Komakado, Gotemba, Shizuoka, Japan
| | - Yasuko Kinoshita
- Chugai Pharmaceutical Co., Ltd., Research Division, Kamakura Research Labs., 200, Kajiwara, Kamakura, Kanagawa, Japan
| | - Hiroshi Hino
- Chugai Pharmaceutical Co., Ltd., Research Division, Fuji Gotemba Research Labs., 1-135, Komakado, Gotemba, Shizuoka, Japan
| | - Mami Kakefuda
- Chugai Research Institute for Medical Science, Inc. 1-135, Komakado, Gotemba, Shizuoka, Japan
| | - Tsuneo Ito
- Chugai Pharmaceutical Co., Ltd., Research Division, Fuji Gotemba Research Labs., 1-135, Komakado, Gotemba, Shizuoka, Japan
| | - Etsuko Fujii
- Chugai Pharmaceutical Co., Ltd., Research Division, Fuji Gotemba Research Labs., 1-135, Komakado, Gotemba, Shizuoka, Japan
| | - Mizuho Noguchi
- Chugai Pharmaceutical Co., Ltd., Research Division, Kamakura Research Labs., 200, Kajiwara, Kamakura, Kanagawa, Japan
| | - Kiyoharu Sato
- Chugai Research Institute for Medical Science, Inc. 1-135, Komakado, Gotemba, Shizuoka, Japan
| | - Masahiro Morita
- Chugai Research Institute for Medical Science, Inc. 1-135, Komakado, Gotemba, Shizuoka, Japan
| | - Hiromi Tateishi
- Chugai Research Institute for Medical Science, Inc. 1-135, Komakado, Gotemba, Shizuoka, Japan
| | - Kaoru Matsumoto
- Chugai Research Institute for Medical Science, Inc. 1-135, Komakado, Gotemba, Shizuoka, Japan
| | - Chisato Goto
- Chugai Research Institute for Medical Science, Inc. 1-135, Komakado, Gotemba, Shizuoka, Japan
| | - Yosuke Kawase
- Chugai Research Institute for Medical Science, Inc. 1-135, Komakado, Gotemba, Shizuoka, Japan
| | - Atsuhiko Kato
- Chugai Pharmaceutical Co., Ltd., Research Division, Fuji Gotemba Research Labs., 1-135, Komakado, Gotemba, Shizuoka, Japan
| | - Kunihiro Hattori
- Chugai Pharmaceutical Co., Ltd., Research Division, Kamakura Research Labs., 200, Kajiwara, Kamakura, Kanagawa, Japan
| | - Junichi Nezu
- Chugai Pharmabody Research Pte. Ltd., 3 Biopolis Drive, #07 - 11 to 16, Synapse, 138623, Singapore
| | - Takahiro Ishiguro
- Chugai Pharmaceutical Co., Ltd., Translational Clinical Research Division, 1-1 Nihonbashi-Muromachi 2-Chome, Chuo-ku, Tokyo, Japan
| | - Kou-Ichi Jishage
- Chugai Pharmaceutical Co., Ltd., Research Division, Fuji Gotemba Research Labs., 1-135, Komakado, Gotemba, Shizuoka, Japan
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18
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Abstract
Based on the histological features and outcome, the current WHO classification separates thymomas into A, AB, B1, B2 and B3 subtypes. It is hypothesized that the type A thymomas are derived from the thymic medulla while the type B thymomas are derived from the cortex. Due to occasional histological overlap between the tumor subtypes creating difficulties in their separation, the aim of this study was to provide their proteomic characterization and identify potential immunohistochemical markers aiding in tissue diagnosis. Pair-wise comparison of neoplastic and normal thymus by liquid chromatography tandem mass spectrometry (LC-MS/MS) of formalin fixed paraffin embedded tissue revealed 61 proteins differentially expressed in thymomas compared to normal tissue. Hierarchical clustering showed distinct segregation of subtypes AB, B1 and B2 from that of A and B3. Most notably, desmoyokin, a protein that is encoded by the AHNAK gene, was associated with type A thymomas and medulla of normal thymus, by LC-MS/MS and immunohistochemistry. In this global proteomic characterization of the thymoma, several proteins unique to different thymic compartments and thymoma subtypes were identified. Among differentially expressed proteins, desmoyokin is a marker specific for thymic medulla and is potentially promising immunohistochemical marker in separation of type A and B3 thymomas.
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19
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O'Hagan KL, Zhao J, Pryshchep O, Wang CR, Phee H. Pak2 Controls Acquisition of NKT Cell Fate by Regulating Expression of the Transcription Factors PLZF and Egr2. THE JOURNAL OF IMMUNOLOGY 2015; 195:5272-84. [PMID: 26519537 DOI: 10.4049/jimmunol.1501367] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Accepted: 10/02/2015] [Indexed: 01/24/2023]
Abstract
NKT cells constitute a small population of T cells developed in the thymus that produce large amounts of cytokines and chemokines in response to lipid Ags. Signaling through the Vα14-Jα18 TCR instructs commitment to the NKT cell lineage, but the precise signaling mechanisms that instruct their lineage choice are unclear. In this article, we report that the cytoskeletal remodeling protein, p21-activated kinase 2 (Pak2), was essential for NKT cell development. Loss of Pak2 in T cells reduced stage III NKT cells in the thymus and periphery. Among different NKT cell subsets, Pak2 was necessary for the generation and function of NKT1 and NKT2 cells, but not NKT17 cells. Mechanistically, expression of Egr2 and promyelocytic leukemia zinc finger (PLZF), two key transcription factors for acquiring the NKT cell fate, were markedly diminished in the absence of Pak2. Diminished expression of Egr2 and PLZF were not caused by aberrant TCR signaling, as determined using a Nur77-GFP reporter, but were likely due to impaired induction and maintenance of signaling lymphocyte activation molecule 6 expression, a TCR costimulatory receptor required for NKT cell development. These data suggest that Pak2 controls thymic NKT cell development by providing a signal that links Egr2 to induce PLZF, in part by regulating signaling lymphocyte activation molecule 6 expression.
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Affiliation(s)
- Kyle L O'Hagan
- Department of Microbiology-Immunology, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611
| | - Jie Zhao
- Department of Microbiology-Immunology, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611
| | - Olga Pryshchep
- Department of Microbiology-Immunology, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611
| | - Chyung-Ru Wang
- Department of Microbiology-Immunology, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611
| | - Hyewon Phee
- Department of Microbiology-Immunology, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611
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20
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Human congenital T-cell receptor disorders. LYMPHOSIGN JOURNAL-THE JOURNAL OF INHERITED IMMUNE DISORDERS 2015. [DOI: 10.14785/lpsn-2014-0012] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Immunodeficiencies of most T-cell receptor (TCR) components (TCRID) have been reported in almost 40 patients worldwide who have also, at times, shown signs of autoimmunity. We updated their clinical, immunological, and molecular features with an emphasis on practical diagnosis, as the range of the disorder grows in complexity with new partial defects. Cellular and animal models are also reviewed and in some cases reveal their limitations for predicting TCRID immunopathology.
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21
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Blanco R, Borroto A, Schamel W, Pereira P, Alarcon B. Conformational changes in the T cell receptor differentially determine T cell subset development in mice. Sci Signal 2014; 7:ra115. [DOI: 10.1126/scisignal.2005650] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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22
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Borroto A, Abia D, Alarcón B. Crammed signaling motifs in the T-cell receptor. Immunol Lett 2014; 161:113-7. [PMID: 24877875 DOI: 10.1016/j.imlet.2014.05.007] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2014] [Revised: 05/07/2014] [Accepted: 05/15/2014] [Indexed: 11/30/2022]
Abstract
Although the T cell antigen receptor (TCR) is long known to contain multiple signaling subunits (CD3γ, CD3δ, CD3ɛ and CD3ζ), their role in signal transduction is still not well understood. The presence of at least one immunoreceptor tyrosine-based activation motif (ITAM) in each CD3 subunit has led to the idea that the multiplication of such elements essentially serves to amplify signals. However, the evolutionary conservation of non-ITAM sequences suggests that each CD3 subunit is likely to have specific non-redundant roles at some stage of development or in mature T cell function. The CD3ɛ subunit is paradigmatic because in a relatively short cytoplasmic sequence (∼55 amino acids) it contains several docking sites for proteins involved in intracellular trafficking and signaling, proteins whose relevance in T cell activation is slowly starting to be revealed. In this review we will summarize our current knowledge on the signaling effectors that bind directly to the TCR and we will propose a hierarchy in their response to TCR triggering.
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Affiliation(s)
- Aldo Borroto
- TCR Signal Transduction Laboratory, Centro de Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Científicas, 28049 Madrid, Spain
| | - David Abia
- Bioinformatics Unit, Centro de Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Científicas, 28049 Madrid, Spain
| | - Balbino Alarcón
- TCR Signal Transduction Laboratory, Centro de Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Científicas, 28049 Madrid, Spain.
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23
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Welinder C, Jönsson G, Ingvar C, Lundgren L, Baldetorp B, Olsson H, Breslin T, Rezeli M, Jansson B, Laurell T, Fehniger TE, Wieslander E, Pawlowski K, Marko-Varga G. Feasibility study on measuring selected proteins in malignant melanoma tissue by SRM quantification. J Proteome Res 2014; 13:1315-26. [PMID: 24490776 DOI: 10.1021/pr400876p] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Currently there are no clinically recognized molecular biomarkers for malignant melanoma (MM) for either diagnosing disease stage or measuring response to therapy. The aim of this feasibility study was to develop targeted selected reaction monitoring (SRM) assays for identifying candidate protein biomarkers in metastatic melanoma tissue lysate. In a pilot study applying the SRM assay, the tissue expression of nine selected proteins [complement 3 (C3), T-cell surface glycoprotein CD3 epsilon chain E (CD3E), dermatopontin, minichromosome maintenance complex component (MCM4), premelanosome protein (PMEL), S100 calcium binding protein A8 (S100A8), S100 calcium binding protein A13 (S100A13), transgelin-2 and S100B] was quantified in a small cohort of metastatic malignant melanoma patients. The SRM assay was developed using a TSQ Vantage triple quadrupole mass spectrometer that generated highly accurate peptide quantification. Repeated injection of internal standards spiked into matrix showed relative standard deviation (RSD) from 6% to 15%. All nine target proteins were identified in tumor lysate digests spiked with heavy peptide standards. The multiplex SRM peptide assay panel was then measured and quantified on a set of frozen MM tissue samples obtained from the Malignant Melanoma Biobank collected in Lund, Sweden. All nine proteins could be accurately quantified using the new SRM assay format. This study provides preliminary data on the heterogeneity of biomarker expression within MM patients. The S100B protein, which is clinically used as the pathology identifier of MM, was identified in 9 out of 10 MM tissue lysates. The use of the targeted SRM assay provides potential advancements in the diagnosis of MM that can aid in future assessments of disease in melanoma patients.
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Affiliation(s)
- Charlotte Welinder
- Departments of †Oncology, ∥Surgery, and ⊥Cancer Epidemiology, Clinical Sciences, and ‡Centre of Excellence in Biological and Medical Mass Spectrometry, Lund University , 221 85 Lund, Sweden
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24
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Fernández-Arenas E, Calleja E, Martínez-Martín N, Gharbi SI, Navajas R, García-Medel N, Penela P, Alcamí A, Mayor F, Albar JP, Alarcón B. β-Arrestin-1 mediates the TCR-triggered re-routing of distal receptors to the immunological synapse by a PKC-mediated mechanism. EMBO J 2014; 33:559-77. [PMID: 24502978 DOI: 10.1002/embj.201386022] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
T-cell receptors (TCR) recognize their antigen ligand at the interface between T cells and antigen-presenting cells, known as the immunological synapse (IS). The IS provides a means of sustaining the TCR signal which requires the continual supply of new TCRs. These are endocytosed and redirected from distal membrane locations to the IS. In our search for novel cytoplasmic effectors, we have identified β-arrestin-1 as a ligand of non-phosphorylated resting TCRs. Using dominant-negative and knockdown approaches we demonstrate that β-arrestin-1 is required for the internalization and downregulation of non-engaged bystander TCRs. Furthermore, TCR triggering provokes the β-arrestin-1-mediated downregulation of the G-protein coupled chemokine receptor CXCR4, but not of other control receptors. We demonstrate that β-arrestin-1 recruitment to the TCR, and bystander TCR and CXCR4 downregulation, are mechanistically mediated by the TCR-triggered PKC-mediated phosphorylation of β-arrestin-1 at Ser163. This mechanism allows the first triggered TCRs to deliver a stop migration signal, and to promote the internalization of distal TCRs and CXCR4 and their translocation to the IS. This receptor crosstalk mechanism is critical to sustain the TCR signal.
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Affiliation(s)
- Elena Fernández-Arenas
- Centro de Biología Molecular "Severo Ochoa", Consejo Superior de Investigaciones Científicas and Universidad Autónoma de Madrid, Madrid, Spain
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25
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Li Y, Chen S, Yang L, Chen S, Lin C, Wang L, Lu Y, Geng S, Du X, Schmidt CA. Change in expression pattern of TCR–CD3 complex in patients with multiple myeloma. Hematology 2013; 16:143-50. [PMID: 21669053 DOI: 10.1179/102453311x12953015767491] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Affiliation(s)
- Yangqiu Li
- Institute of HematologyMedical College, Medical College, Jinan University, Guangzhou, China
- Key Laboratory for Regenerative Medicine of Ministry of EducationMedical College, Jinan University, Guangzhou, China
| | - Shaohua Chen
- Institute of HematologyMedical College, Medical College, Jinan University, Guangzhou, China
| | - Lijian Yang
- Institute of HematologyMedical College, Medical College, Jinan University, Guangzhou, China
| | - Si Chen
- Institute of HematologyMedical College, Medical College, Jinan University, Guangzhou, China
| | - Chunlan Lin
- Department of BiochemistryMedical College, Jinan University, Guangzhou, China
| | - Liang Wang
- Institute of HematologyMedical College, Medical College, Jinan University, Guangzhou, China
| | - Yuhong Lu
- Institute of HematologyMedical College, Medical College, Jinan University, Guangzhou, China
| | - Suxia Geng
- Department of HematologyGuangdong Province People’s Hospital, Guangzhou, China
| | - Xin Du
- Department of HematologyGuangdong Province People’s Hospital, Guangzhou, China
| | - Christian A Schmidt
- Department of Hematology and OncologyErnst-Moritz-Arndt University Greifswald, Greifswald, Germany
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26
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Boehm T. Self-renewal of thymocytes in the absence of competitive precursor replenishment. ACTA ACUST UNITED AC 2013; 209:1397-400. [PMID: 22851642 PMCID: PMC3420333 DOI: 10.1084/jem.20121412] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Soon after transplantation of wild-type thymi into immunodeficient mice lacking functional T cell receptors, productive T cell development in the donor thymus ceases. This observation underlies one of the central dogmas of T cell biology: because thymocytes are seemingly short-lived, intrathymic T cell development depends on continuous import of lymphoid progenitors from the bone marrow. New work reinterprets the outcome of this classical experiment as being the result of competition for intrathymic niches specifically supporting the DN3 stage of early T cell development. Surprisingly, when this niche space is uncontested by immigrating host progenitors, development of T cells in the thymus grafts continues. These new findings suggest that early thymocytes do indeed have substantial self-renewing potential.
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Affiliation(s)
- Thomas Boehm
- Department of Developmental Immunology, Max Planck Institute of Immunobiology and Epigenetics, D-79108 Freiburg, Germany.
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27
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El Aidy S, van Baarlen P, Derrien M, Lindenbergh-Kortleve DJ, Hooiveld G, Levenez F, Doré J, Dekker J, Samsom JN, Nieuwenhuis EES, Kleerebezem M. Temporal and spatial interplay of microbiota and intestinal mucosa drive establishment of immune homeostasis in conventionalized mice. Mucosal Immunol 2012; 5:567-79. [PMID: 22617837 DOI: 10.1038/mi.2012.32] [Citation(s) in RCA: 165] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
During colonization of germfree mice with the total fecal microbial community of their conventionally born and raised siblings (conventionalization), the intestinal mucosal immune system initiates and maintains a balanced immune response. However, the genetic regulation of these balanced, appropriate responses to the microbiota is obscure. Here, combined analysis of germfree and conventionalized mice revealed that the major molecular responses could be detected initiating at day 4 post conventionalization, with a strong induction of innate immune functions followed by stimulation of adaptive immune responses and development and expansion of adaptive immune cells at later stages of conventionalization. This study provides a comprehensive overview of mouse developmental and immune-related cellular pathways and processes that were co-mediated by the commensal microbiota and suggests which mechanisms were involved in this reprogramming. The dynamic, region-dependent mucosal responses to the colonizing microbiota revealed potential transcriptional signatures for the control of intestinal homeostasis in healthy mice, which may help to decipher the genetic basis of pathway dysregulation in human intestinal inflammatory diseases.
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Affiliation(s)
- Sahar El Aidy
- Top Institute Food and Nutrition, Wageningen, The Netherlands
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28
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Belkaya S, Silge RL, Hoover AR, Medeiros JJ, Eitson JL, Becker AM, de la Morena MT, Bassel-Duby RS, van Oers NSC. Dynamic modulation of thymic microRNAs in response to stress. PLoS One 2011; 6:e27580. [PMID: 22110677 PMCID: PMC3217971 DOI: 10.1371/journal.pone.0027580] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2011] [Accepted: 10/19/2011] [Indexed: 12/02/2022] Open
Abstract
BACKGROUND Physiological stress evokes rapid changes in both the innate and adaptive immune response. Immature αβ T cells developing in the thymus are particularly sensitive to stress, with infections and/or exposure to lipopolysaccharide or glucocorticoids eliciting a rapid apoptotic program. MicroRNAs are a class of small, non-coding RNAs that regulate global gene expression by targeting diverse mRNAs for degradation. We hypothesized that a subset of thymically encoded microRNAs would be stress responsive and modulate thymopoiesis. We performed microRNA profiling of thymic microRNAs isolated from control or stressed thymic tissue obtained from mice. We identified 18 microRNAs that are dysregulated >1.5-fold in response to lipopolysaccharide or the synthetic corticosteroid dexamethasone. These included the miR-17-90 cluster, which have anti-apoptotic functions, and the miR-181 family, which contribute to T cell tolerance. The stress-induced changes in the thymic microRNAs are dynamically and distinctly regulated in the CD4(-)CD8(-), CD4(+)CD8(+), CD4(+)CD8(-), and CD4(-)CD8(+) thymocyte subsets. Several of the differentially regulated murine thymic miRs are also stress responsive in the heart, kidney, liver, brain, and/or spleen. The most dramatic thymic microRNA down modulated is miR-181d, exhibiting a 15-fold reduction following stress. This miR has both similar and distinct gene targets as miR-181a, another member of miR-181 family. Many of the differentially regulated microRNAs have known functions in thymopoiesis, indicating that their dysregulation will alter T cell repertoire selection and the formation of naïve T cells. This data has implications for clinical treatments involving anti-inflammatory steroids, ablation therapies, and provides mechanistic insights into the consequences of infections.
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Affiliation(s)
- Serkan Belkaya
- The Department of Immunology, The University of Texas Southwestern Medical Center, Dallas, Texas, United States of America
| | - Robert L. Silge
- The Department of Immunology, The University of Texas Southwestern Medical Center, Dallas, Texas, United States of America
| | - Ashley R. Hoover
- The Department of Immunology, The University of Texas Southwestern Medical Center, Dallas, Texas, United States of America
| | - Jennifer J. Medeiros
- The Department of Immunology, The University of Texas Southwestern Medical Center, Dallas, Texas, United States of America
| | - Jennifer L. Eitson
- The Department of Immunology, The University of Texas Southwestern Medical Center, Dallas, Texas, United States of America
| | - Amy M. Becker
- The Department of Immunology, The University of Texas Southwestern Medical Center, Dallas, Texas, United States of America
| | - M. Teresa de la Morena
- The Department of Pediatrics, The University of Texas Southwestern Medical Center, Dallas, Texas, United States of America
| | - Rhonda S. Bassel-Duby
- The Department of Molecular Biology, The University of Texas Southwestern Medical Center, Dallas, Texas, United States of America
| | - Nicolai S. C. van Oers
- The Department of Immunology, The University of Texas Southwestern Medical Center, Dallas, Texas, United States of America
- The Department of Pediatrics, The University of Texas Southwestern Medical Center, Dallas, Texas, United States of America
- The Department of Microbiology, The University of Texas Southwestern Medical Center, Dallas, Texas, United States of America
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29
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Luo H, Charpentier T, Wang X, Qi S, Han B, Wu T, Terra R, Lamarre A, Wu J. Efnb1 and Efnb2 proteins regulate thymocyte development, peripheral T cell differentiation, and antiviral immune responses and are essential for interleukin-6 (IL-6) signaling. J Biol Chem 2011; 286:41135-41152. [PMID: 21976681 DOI: 10.1074/jbc.m111.302596] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Erythropoietin-producing hepatocellular kinases (Eph kinases) constitute the largest family of cell membrane receptor tyrosine kinases, and their ligand ephrins are also cell surface molecules. Because of promiscuous interaction between Ephs and ephrins, there is considerable redundancy in this system, reflecting the essential roles of these molecules in the biological system through evolution. In this study, both Efnb1 and Efnb2 were null-mutated in the T cell compartment of mice through loxP-mediated gene deletion. Mice with this double conditional mutation (double KO mice) showed reduced thymus and spleen size and cellularity. There was a significant decrease in the DN4, double positive, and single positive thymocyte subpopulations and mature CD4 and CD8 cells in the periphery. dKO thymocytes and peripheral T cells failed to compete with their WT counterparts in irradiated recipients, and the T cells showed compromised ability of homeostatic expansion. dKO naive T cells were inferior in differentiating into Th1 and Th17 effectors in vitro. The dKO mice showed diminished immune response against LCMV infection. Mechanistic studies revealed that IL-6 signaling in dKO T cells was compromised, in terms of abated induction of STAT3 phosphorylation upon IL-6 stimulation. This defect likely contributed to the observed in vitro and in vivo phenotype in dKO mice. This study revealed novel roles of Efnb1 and Efnb2 in T cell development and function.
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Affiliation(s)
- Hongyu Luo
- Laboratoire Immunologie, Notre-Dame Hospital, Montreal, Quebec H2L 4M1, Canada
| | - Tania Charpentier
- Institut National de la Recherche Scientifique, INRS-Institut Armand-Frappier, Laval, Québec H7V 1B7, Canada
| | - Xuehai Wang
- Laboratoire Immunologie, Notre-Dame Hospital, Montreal, Quebec H2L 4M1, Canada
| | - Shijie Qi
- Laboratoire Immunologie, Notre-Dame Hospital, Montreal, Quebec H2L 4M1, Canada
| | - Bing Han
- Laboratoire Immunologie, Notre-Dame Hospital, Montreal, Quebec H2L 4M1, Canada
| | - Tao Wu
- Laboratoire Immunologie, Notre-Dame Hospital, Montreal, Quebec H2L 4M1, Canada; Institute of Cardiology, First Affiliated Hospital, Medical College, Zhejiang University, 310003 Hangzhou, China
| | - Rafik Terra
- Laboratoire Immunologie, Notre-Dame Hospital, Montreal, Quebec H2L 4M1, Canada
| | - Alain Lamarre
- Institut National de la Recherche Scientifique, INRS-Institut Armand-Frappier, Laval, Québec H7V 1B7, Canada
| | - Jiangping Wu
- Laboratoire Immunologie, Notre-Dame Hospital, Montreal, Quebec H2L 4M1, Canada; Service Nephrologie, Centre de Recherche du Centre Hospitalier de l'Université de Montréal, Notre-Dame Hospital, Montreal, Quebec H2L 4M1, Canada.
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30
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Kumar R, Ferez M, Swamy M, Arechaga I, Rejas MT, Valpuesta JM, Schamel WWA, Alarcon B, van Santen HM. Increased sensitivity of antigen-experienced T cells through the enrichment of oligomeric T cell receptor complexes. Immunity 2011; 35:375-87. [PMID: 21903423 DOI: 10.1016/j.immuni.2011.08.010] [Citation(s) in RCA: 135] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2010] [Revised: 05/11/2011] [Accepted: 08/23/2011] [Indexed: 12/25/2022]
Abstract
Although memory T cells respond more vigorously to stimulation and they are more sensitive to low doses of antigen than naive T cells, the molecular basis of this increased sensitivity remains unclear. We have previously shown that the T cell receptor (TCR) exists as different-sized oligomers on the surface of resting T cells and that large oligomers are preferentially activated in response to low antigen doses. Through biochemistry and electron microscopy, we now showed that previously stimulated and memory T cells have more and larger TCR oligomers at the cell surface than their naive counterparts. Reconstitution of cells and mice with a point mutant of the CD3ζ subunit, which impairs TCR oligomer formation, demonstrated that the increased size of TCR oligomers was directly responsible for the increased sensitivity of antigen-experienced T cells. Thus, we propose that an "avidity maturation" mechanism underlies T cell antigenic memory.
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Affiliation(s)
- Rashmi Kumar
- Departamento de Biología Celular e Inmunología, Centro Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Científicas, Universidad Autónoma de Madrid, 28049 Madrid, Spain
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31
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Chen S, Zha X, Yang L, Li B, Liye Z, Li Y. Deficiency of CD3gamma, delta, epsilon, and zeta expression in T cells from AML patients. ACTA ACUST UNITED AC 2011; 16:31-6. [PMID: 21269565 DOI: 10.1179/102453311x12902908411832] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
In order to elucidate the feature of T-cell receptor (TCR) signal transduction in T-cells from acute myeloid leukemia (AML), the expression levels of CD3gamma, delta, epsilon and zeta chain genes in CD3+ T cells were analyzed using real-time PCR. CD3+ T cells sorted from peripheral blood of 10 AML patients and 10 healthy donors were used in the study. Significantly lower expression levels of all four CD3gamma, delta, epsilon, and zeta chain genes were found in the AML samples. The expression pattern of the four CD3 chains was epsilon>gamma>delta>zeta in CD3+ T cells from AML samples, which was different from the healthy control group. In conclusion, the results provide a global gene expression profile of CD3gamma, delta, epsilon, and zeta chains in AML patients. Deficiency of all four CD3 gene expression levels might represent the feature related to T-cell immunodeficiency.
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Affiliation(s)
- Shaohua Chen
- Institute of Hematology, Medical College, Jinan University, Guangzhou, China
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32
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Neklesa TK, Tae HS, Schneekloth AR, Stulberg MJ, Corson TW, Sundberg TB, Raina K, Holley SA, Crews CM. Small-molecule hydrophobic tagging-induced degradation of HaloTag fusion proteins. Nat Chem Biol 2011; 7:538-43. [PMID: 21725302 PMCID: PMC3139752 DOI: 10.1038/nchembio.597] [Citation(s) in RCA: 271] [Impact Index Per Article: 20.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2010] [Accepted: 04/13/2011] [Indexed: 01/29/2023]
Abstract
The ability to regulate any protein of interest in living systems with small molecules remains a challenge. We hypothesized that appending a hydrophobic moiety to the surface of a protein would mimic the partially denatured state of the protein, thus engaging the cellular quality control machinery to induce its proteasomal degradation. We designed and synthesized bifunctional small molecules that bind a bacterial dehalogenase (HaloTag protein) and present a hydrophobic group on its surface. Remarkably, hydrophobic tagging of the HaloTag protein with an adamantyl moiety induced the degradation of cytosolic, isoprenylated, and transmembrane fusion proteins in cell culture. We demonstrated the in vivo utility of hydrophobic tagging by degrading proteins expressed in zebrafish embryos and by inhibiting RasG12V-driven tumor progression in mice. Therefore, hydrophobic tagging of HaloTag fusion proteins affords small molecule control over any protein of interest, making it an ideal system for validating potential drug targets in disease models.
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Affiliation(s)
- Taavi K Neklesa
- Department of Molecular, Cellular and Developmental Biology, Yale University, New Haven, Connecticut, USA
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33
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Hathcock KS, Farrington L, Ivanova I, Livak F, Selimyan R, Sen R, Williams J, Tai X, Hodes RJ. The requirement for pre-TCR during thymic differentiation enforces a developmental pause that is essential for V-DJβ rearrangement. PLoS One 2011; 6:e20639. [PMID: 21673984 PMCID: PMC3108609 DOI: 10.1371/journal.pone.0020639] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2011] [Accepted: 05/06/2011] [Indexed: 01/26/2023] Open
Abstract
T cell development occurs in the thymus and is critically dependent on productive TCRβ rearrangement and pre-TCR expression in DN3 cells. The requirement for pre-TCR expression results in the arrest of thymocytes at the DN3 stage (β checkpoint), which is uniquely permissive for V-DJβ recombination; only cells expressing pre-TCR survive and develop beyond the DN3 stage. In addition, the requirement for TCRβ rearrangement and pre-TCR expression enforces suppression of TCRβ rearrangement on a second allele, allelic exclusion, thus ensuring that each T cell expresses only a single TCRβ product. However, it is not known whether pre-TCR expression is essential for allelic exclusion or alternatively if allelic exclusion is enforced by developmental changes that can occur in the absence of pre-TCR. We asked if thymocytes that were differentiated without pre-TCR expression, and therefore without pause at the β checkpoint, would suppress all V-DJβ rearrangement. We previously reported that premature CD28 signaling in murine CD4(-)CD8(-) (DN) thymocytes supports differentiation of CD4(+)CD8(+) (DP) cells in the absence of pre-TCR expression. The present study uses this model to define requirements for TCRβ rearrangement and allelic exclusion. We demonstrate that if cells exit the DN3 developmental stage before TCRβ rearrangement occurs, V-DJβ rearrangement never occurs, even in DP cells that are permissive for D-Jβ and TCRα rearrangement. These results demonstrate that pre-TCR expression is not essential for thymic differentiation to DP cells or for V-DJβ suppression. However, the requirement for pre-TCR signals and the exclusion of alternative stimuli such as CD28 enforce a developmental "pause" in early DN3 cells that is essential for productive TCRβ rearrangement to occur.
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MESH Headings
- Animals
- B7-2 Antigen/genetics
- B7-2 Antigen/metabolism
- CD28 Antigens/genetics
- CD28 Antigens/metabolism
- Cell Differentiation
- DNA-Binding Proteins/metabolism
- Gene Expression Regulation/immunology
- Gene Rearrangement, alpha-Chain T-Cell Antigen Receptor
- Gene Rearrangement, beta-Chain T-Cell Antigen Receptor
- Histones/chemistry
- Histones/metabolism
- Lysine
- Membrane Glycoproteins/genetics
- Membrane Glycoproteins/metabolism
- Methylation
- Mice
- Mice, Transgenic
- Receptors, Antigen, T-Cell, alpha-beta/genetics
- Receptors, Antigen, T-Cell, alpha-beta/metabolism
- T-Lymphocytes/cytology
- T-Lymphocytes/immunology
- T-Lymphocytes/metabolism
- Thymus Gland/cytology
- Thymus Gland/metabolism
- Transcription, Genetic/immunology
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Affiliation(s)
- Karen S Hathcock
- Experimental Immunology Branch, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, United States of America.
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34
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de la Cruz J, Kruger T, Parks CA, Silge RL, van Oers NSC, Luescher IF, Schrum AG, Gil D. Basal and antigen-induced exposure of the proline-rich sequence in CD3ε. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2011; 186:2282-90. [PMID: 21228347 PMCID: PMC3810001 DOI: 10.4049/jimmunol.1003225] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The CD3ε cytoplasmic tail contains a conserved proline-rich sequence (PRS) that influences TCR-CD3 expression and signaling. Although the PRS can bind the SH3.1 domain of the cytosolic adapter Nck, whether the PRS is constitutively available for Nck binding or instead represents a cryptic motif that is exposed via conformational change upon TCR-CD3 engagement (CD3Δc) is currently unresolved. Furthermore, the extent to which a cis-acting CD3ε basic amino acid-rich stretch (BRS), with its unique phosphoinositide-binding capability, might impact PRS accessibility is not clear. In this study, we found that freshly harvested primary thymocytes expressed low to moderate basal levels of Nck-accessible PRS ("open-CD3"), although most TCR-CD3 complexes were inaccessible to Nck ("closed-CD3"). Ag presentation in vivo induced open-CD3, accounting for half of the basal level found in thymocytes from MHC(+) mice. Additional stimulation with either anti-CD3 Abs or peptide-MHC ligands further elevated open-CD3 above basal levels, consistent with a model wherein antigenic engagement induces maximum PRS exposure. We also found that the open-CD3 conformation induced by APCs outlasted the time of ligand occupancy, marking receptors that had been engaged. Finally, CD3ε BRS-phosphoinositide interactions played no role in either adoption of the initial closed-CD3 conformation or induction of open-CD3 by Ab stimulation. Thus, a basal level of open-CD3 is succeeded by a higher, induced level upon TCR-CD3 engagement, involving CD3Δc and prolonged accessibility of the CD3ε PRS to Nck.
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MESH Headings
- Amino Acid Motifs/immunology
- Animals
- Antigen-Presenting Cells/immunology
- Antigen-Presenting Cells/metabolism
- CD3 Complex/genetics
- CD3 Complex/immunology
- CD3 Complex/metabolism
- Cell Line, Tumor
- Epitopes, T-Lymphocyte/physiology
- Hybridomas
- Mice
- Mice, Inbred C57BL
- Mice, Knockout
- Mice, Transgenic
- Peptide Fragments/genetics
- Peptide Fragments/immunology
- Peptide Fragments/metabolism
- Proline/immunology
- Proline/metabolism
- Receptor-CD3 Complex, Antigen, T-Cell/genetics
- Receptor-CD3 Complex, Antigen, T-Cell/immunology
- Receptor-CD3 Complex, Antigen, T-Cell/metabolism
- T-Lymphocytes/immunology
- T-Lymphocytes/metabolism
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Affiliation(s)
- Javier de la Cruz
- Department of Immunology, College of Medicine, Mayo Clinic, Rochester, MN 55905
- Initiative to Maximize Student Diversity and Post Baccalaureate Research Education Program, College of Medicine, Mayo Clinic, Rochester, MN 55905
| | - Travis Kruger
- Department of Immunology, College of Medicine, Mayo Clinic, Rochester, MN 55905
- Summer Undergraduate Research Fellowship Program, College of Medicine, Mayo Clinic, Rochester, MN 55905
| | - Christopher A. Parks
- Department of Immunology, College of Medicine, Mayo Clinic, Rochester, MN 55905
- Summer Undergraduate Research Fellowship Program, College of Medicine, Mayo Clinic, Rochester, MN 55905
| | - Robert L. Silge
- Department of Immunology, University of Texas Southwestern Medical Center, Dallas, TX 75390
| | - Nicolai S. C. van Oers
- Department of Immunology, University of Texas Southwestern Medical Center, Dallas, TX 75390
| | - Immanuel F. Luescher
- Ludwig Institute for Cancer Research, Lausanne Branch, University of Lausanne, 1066 Epalinges, Switzerland
| | - Adam G. Schrum
- Department of Immunology, College of Medicine, Mayo Clinic, Rochester, MN 55905
| | - Diana Gil
- Department of Immunology, College of Medicine, Mayo Clinic, Rochester, MN 55905
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35
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Kim ST, Touma M, Takeuchi K, Sun ZYJ, Dave VP, Kappes DJ, Wagner G, Reinherz EL. Distinctive CD3 heterodimeric ectodomain topologies maximize antigen-triggered activation of alpha beta T cell receptors. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2010; 185:2951-9. [PMID: 20660709 PMCID: PMC2936104 DOI: 10.4049/jimmunol.1000732] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The alphabeta TCR has recently been suggested to function as an anisotropic mechanosensor during immune surveillance, converting mechanical energy into a biochemical signal upon specific peptide/MHC ligation of the alphabeta clonotype. The heterodimeric CD3epsilongamma and CD3epsilondelta subunits, each composed of two Ig-like ectodomains, form unique side-to-side hydrophobic interfaces involving their paired G-strands, rigid connectors to their respective transmembrane segments. Those dimers are laterally disposed relative to the alphabeta heterodimer within the TCR complex. In this paper, using structure-guided mutational analysis, we investigate the functional consequences of a striking asymmetry in CD3gamma and CD3delta G-strand geometries impacting ectodomain shape. The uniquely kinked conformation of the CD3gamma G-strand is crucial for maximizing Ag-triggered TCR activation and surface TCR assembly/expression, offering a geometry to accommodate juxtaposition of CD3gamma and TCR beta ectodomains and foster quaternary change that cannot be replaced by the isologous CD3delta subunit's extracellular region. TCRbeta and CD3 subunit protein sequence analyses among Gnathostomata species show that the Cbeta FG loop and CD3gamma subunit coevolved, consistent with this notion. Furthermore, restoration of T cell activation and development in CD3gamma(-/-) mouse T lineage cells by interspecies replacement can be rationalized from structural insights on the topology of chimeric mouse/human CD3epsilondelta dimers. Most importantly, our findings imply that CD3gamma and CD3delta evolved from a common precursor gene to optimize peptide/MHC-triggered alphabeta TCR activation.
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MESH Headings
- Amino Acid Sequence
- Animals
- CD3 Complex/chemistry
- CD3 Complex/genetics
- CD3 Complex/physiology
- Evolution, Molecular
- Mice
- Mice, Inbred C57BL
- Mice, Knockout
- Mice, Transgenic
- Molecular Sequence Data
- Organ Culture Techniques
- Protein Multimerization
- Protein Structure, Quaternary
- Protein Structure, Tertiary
- Receptors, Antigen, T-Cell, alpha-beta/metabolism
- Receptors, Antigen, T-Cell, alpha-beta/physiology
- Sheep
- Signal Transduction/genetics
- Signal Transduction/immunology
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Affiliation(s)
- Sun Taek Kim
- Laboratory of Immunobiology and Department of Medical Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02115
- Department of Medicine, Harvard Medical School, Boston, MA 02115
| | - Maki Touma
- Laboratory of Immunobiology and Department of Medical Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02115
- Department of Medicine, Harvard Medical School, Boston, MA 02115
| | - Koh Takeuchi
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA 02115
| | - Zhen-Yu J. Sun
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA 02115
| | - Vibhuti P. Dave
- Lymphocyte Development Laboratory, Clinical Research Institute of Montreal, Montreal, Quebec, Canada
| | - Dietmar J. Kappes
- Blood Cell Development and Cancer Program, Fox Chase Cancer Center, Philadelphia, PA 19111
| | - Gerhard Wagner
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA 02115
| | - Ellis L. Reinherz
- Laboratory of Immunobiology and Department of Medical Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02115
- Department of Medicine, Harvard Medical School, Boston, MA 02115
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36
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Abstract
Signal transduction by the T-cell antigen receptor (TCR) is initiated by phosphorylation of conserved motifs (ITAMs) contained within the cytoplasmic domains of the invariant subunits. TCR complexes contain a total of 10 ITAMs and this unusual configuration has prompted studies of the role of specific ITAMs, or of ITAM multiplicity, in regulating TCR-directed developmental and effector responses. Here, we summarize data generated during the past two decades and discuss how these findings have in some cases resolved, and in others complicated, outstanding questions relating to the function of TCR ITAMs.
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Affiliation(s)
- Paul E Love
- Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892, USA.
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37
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Montaudouin C, Boucontet L, Mailhé-Lembezat MP, Mariotti-Ferrandiz ME, Louise A, Six A, Freitas AA, Garcia S. Endogenous TCR recombination in TCR Tg single RAG-deficient mice uncovered by robust in vivo T cell activation and selection. PLoS One 2010; 5:e10238. [PMID: 20454452 PMCID: PMC2861594 DOI: 10.1371/journal.pone.0010238] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2009] [Accepted: 03/23/2010] [Indexed: 12/16/2022] Open
Abstract
Recombination activating gene (RAG)-deficient TCR (T Cell Receptor) Tg (transgenic) mice are routinely used as sources of monoclonal T cells. We found that after the transfer of T cells from a RAG-2-deficient 5CC7 TCR Tg mice into allogeneic hosts we recovered a population of T cells expressing diverse alphabeta-TCRs. In fact, in the thymus and spleen of the 5CC7 RAG-2-deficient donor mice, we detected rare T cells expressing non-Tg TCR chains. Similar observations were obtained using T cells from two other TCR transgenic strains, namely RAG-2-deficient aHY and RAG-1-deficient OT-1 mice. The sequences of the endogenous TCR transcripts suggested that gene recombination could occur, albeit quite inefficiently, in the RAG-deficient mice we used. In agreement, we evidenced rare TCR Valpha and Vbeta-chain transcripts in non-Tg RAG-2-deficient mice. Since in these non-Tg RAG-deficient mice no mature T cells could ever be found, our findings suggested a role for the TCR Tg in rescuing rare recombined endogenous chains. Robust T-cell activation by the allogeneic environment favored the selection and expansion of the rare cells expressing endogenous TCRs. Potential mechanisms involved in the recombination of the endogenous TCR chains in the different strains of RAG-deficient mice used, and in particular the possibility of RAG-1 hypomorphism due to an incomplete knocking out procedure, are discussed. Our findings have important experimental implications for studies using TCR-Tg RAG-deficient cells as monoclonal T cell populations.
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Affiliation(s)
- Caroline Montaudouin
- Unité de Biologie des Populations Lymphocytaires, Département d'Immunologie, Institut Pasteur, Centre National de Recherche Scientifique-Unité de Recherche Associée 1961, Paris, France
| | - Laurent Boucontet
- Unité du Développement des Lymphocytes, Département d'Immunologie, Institut Pasteur, Institut National de la Santé et de la Recherche Médicale U668, Paris, France
| | - Marie-Pierre Mailhé-Lembezat
- Unité de Biologie des Populations Lymphocytaires, Département d'Immunologie, Institut Pasteur, Centre National de Recherche Scientifique-Unité de Recherche Associée 1961, Paris, France
| | - Maria-Encarnita Mariotti-Ferrandiz
- Unité de Physiopathologie des Infections, Département d'Immunologie, Institut Pasteur, Centre National de Recherche Scientifique-Unité de Recherche Associée 1961, Paris, France
| | - Anne Louise
- Plate-forme de Cytométrie, Département d'Immunologie, Institut Pasteur, Paris, France
| | - Adrien Six
- Unité de Physiopathologie des Infections, Département d'Immunologie, Institut Pasteur, Centre National de Recherche Scientifique-Unité de Recherche Associée 1961, Paris, France
| | - Antonio A. Freitas
- Unité de Biologie des Populations Lymphocytaires, Département d'Immunologie, Institut Pasteur, Centre National de Recherche Scientifique-Unité de Recherche Associée 1961, Paris, France
- * E-mail: (AAF); (SG)
| | - Sylvie Garcia
- Unité de Biologie des Populations Lymphocytaires, Département d'Immunologie, Institut Pasteur, Centre National de Recherche Scientifique-Unité de Recherche Associée 1961, Paris, France
- * E-mail: (AAF); (SG)
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Positive selection on apoptosis related genes. FEBS Lett 2009; 584:469-76. [PMID: 20026333 DOI: 10.1016/j.febslet.2009.12.022] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2009] [Revised: 12/15/2009] [Accepted: 12/15/2009] [Indexed: 12/23/2022]
Abstract
Apoptosis is a form of programmed cell death crucial for development, homeostasis, immunity, spermatogenesis, and prevention of cancer. Positive selection acting on mammalian apoptosis related genes targets protein interfaces that interact with pathogens and also elements of signaling complexes. Selection appears primarily to be driven by the immune/defense related function of these genes. Moreover, competitive interactions could be driving positive selection among sperm cells, as well as the need for protection against female anti-sperm immune responses. Trade-offs in fitness are expected out of these selective pressures, which could explain the involvement of these genes in various diseases, including cancer.
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Wang Y, Becker D, Vass T, White J, Marrack P, Kappler JW. A conserved CXXC motif in CD3epsilon is critical for T cell development and TCR signaling. PLoS Biol 2009; 7:e1000253. [PMID: 19956738 PMCID: PMC2776832 DOI: 10.1371/journal.pbio.1000253] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2009] [Accepted: 10/21/2009] [Indexed: 12/21/2022] Open
Abstract
Structural integrity of the extracellular membrane-proximal stalk region of CD3ε is required for efficient signaling by the T cell antigen receptor complex. The results in this article suggest that receptor aggregation may not be sufficient for a complete T cell receptor signal and that some type of direct allosteric signal may be involved. Virtually all T cell development and functions depend on its antigen receptor. The T cell receptor (TCR) is a multi-protein complex, comprised of a ligand binding module and a signal transmission module. The signal transmission module includes proteins from CD3 family (CD3ε, CD3δ, CD3γ) as well as the ζ chain protein. The CD3 proteins have a short extracellular stalk connecting their Ig-like domains to their transmembrane regions. These stalks contain a highly evolutionarily conserved CXXC motif, whose function is unknown. To understand the function of these two conserved cysteines, we generated mice that lacked endogenous CD3ε but expressed a transgenic CD3ε molecule in which these cysteines were mutated to serines. Our results show that the mutated CD3ε could incorporate into the TCR complex and rescue surface TCR expression in CD3ε null mice. In the CD3ε mutant mice, all stages of T cell development and activation that are TCR-dependent were impaired, but not eliminated, including activation of mature naïve T cells with the MHCII presented superantigen, staphylococcal enterotoxin B, or with a strong TCR cross-linking antibody specific for either TCR-Cβ or CD3ε. These results argue against a simple aggregation model for TCR signaling and suggest that the stalks of the CD3 proteins may be critical in transmitting part of the activation signal directly through the membrane. The T cells of the immune system have surface receptors that detect unique features (called antigens) of foreign invaders such as viruses, bacteria and toxins. An encounter between an antigen and the T cell receptor sets off a chain of events that activates the T cell to proliferate and thus call to action the various arms of the immune response that ultimately eliminate the invader. A set of proteins, called CD3, associates with the T cell receptor, spanning the cell membrane. Their function is to deliver a signal to the inside of T cell that its receptor has encountered antigen on the outside of the cell. Two general ideas have been proposed to explain how the CD3 proteins accomplish this: That the engagement of the T cell receptor outside the cell directly causes a change in conformation in the intracellular portion of the associated CD3 proteins that is recognized by the intracellular signaling machinery; and that engagement of the T cell receptor causes clustering of multiple receptor and CD3 proteins such that interactions among the cytoplasmic portions of the many CD3 proteins now attract other proteins to start the chain of intercellular signaling. These two ideas are not mutually exclusive. We show here that mutations in a highly conserved extracellular portion of one of the CD3 proteins can impair the transmission of the activation signal without preventing receptor clustering. These results suggest that direct transmission of a conformational change across the membrane may constitute part of the CD3-mediated activation signal.
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Affiliation(s)
- Yibing Wang
- Integrated Department of Immunology, National Jewish Health, Denver, Colorado, United States of America
- Howard Hughes Medical Institute, National Jewish Health, Denver, Colorado, United States of America
| | - Dean Becker
- Integrated Department of Immunology, National Jewish Health, Denver, Colorado, United States of America
- Howard Hughes Medical Institute, National Jewish Health, Denver, Colorado, United States of America
| | - Tibor Vass
- Integrated Department of Immunology, National Jewish Health, Denver, Colorado, United States of America
- Howard Hughes Medical Institute, National Jewish Health, Denver, Colorado, United States of America
| | - Janice White
- Integrated Department of Immunology, National Jewish Health, Denver, Colorado, United States of America
- Howard Hughes Medical Institute, National Jewish Health, Denver, Colorado, United States of America
| | - Philippa Marrack
- Integrated Department of Immunology, National Jewish Health, Denver, Colorado, United States of America
- Howard Hughes Medical Institute, National Jewish Health, Denver, Colorado, United States of America
- Department of Biochemistry and Molecular Genetics, University of Colorado at Denver and Health Sciences Center, Aurora, Colorado, United States of America
| | - John W. Kappler
- Integrated Department of Immunology, National Jewish Health, Denver, Colorado, United States of America
- Howard Hughes Medical Institute, National Jewish Health, Denver, Colorado, United States of America
- Program in Biomolecular Structure, University of Colorado at Denver and Health Sciences Center, Aurora, Colorado, United States of America
- * E-mail:
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40
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Laird RM, Hayes SM. Dynamics of CD3γɛ and CD3δɛ dimer expression during murine T cell development. Mol Immunol 2009; 47:582-9. [DOI: 10.1016/j.molimm.2009.09.015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2009] [Accepted: 09/03/2009] [Indexed: 11/15/2022]
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41
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42
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Martínez-Martín N, Risueño RM, Morreale A, Zaldívar I, Fernández-Arenas E, Herranz F, Ortiz AR, Alarcón B. Cooperativity between T cell receptor complexes revealed by conformational mutants of CD3epsilon. Sci Signal 2009; 2:ra43. [PMID: 19671929 DOI: 10.1126/scisignal.2000402] [Citation(s) in RCA: 86] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The CD3epsilon subunit of the T cell receptor (TCR) complex undergoes a conformational change upon ligand binding that is thought to be important for the activation of T cells. To study this process, we built a molecular dynamics model of the transmission of the conformational change within the ectodomains of CD3. The model showed that the CD3 dimers underwent a stiffening effect that was funneled to the base of the CD3epsilon subunit. Mutation of two relevant amino acid residues blocked transmission of the conformational change and the differentiation and activation of T cells. Furthermore, this inhibition occurred even in the presence of excess endogenous CD3epsilon subunits. These results emphasize the importance of the conformational change in CD3epsilon for the activation of T cells and suggest the existence of unforeseen cooperativity between TCR complexes.
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Affiliation(s)
- Nuria Martínez-Martín
- Centro de Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Científicas, Universidad Autónoma de Madrid, Cantoblanco, Madrid 28049, Spain
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43
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DeFord-Watts LM, Tassin TC, Becker AM, Medeiros JJ, Albanesi JP, Love PE, Wülfing C, van Oers NSC. The cytoplasmic tail of the T cell receptor CD3 epsilon subunit contains a phospholipid-binding motif that regulates T cell functions. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2009; 183:1055-64. [PMID: 19542373 PMCID: PMC2954055 DOI: 10.4049/jimmunol.0900404] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The CD3 epsilon subunit of the TCR complex contains two defined signaling domains, a proline-rich sequence and an ITAM. We identified a third signaling sequence in CD3 epsilon, termed the basic-rich stretch (BRS). Herein, we show that the positively charged residues of the BRS enable this region of CD3 epsilon to complex a subset of acidic phospholipids, including PI(3)P, PI(4)P, PI(5)P, PI(3,4,5)P(3), and PI(4,5)P(2). Transgenic mice containing mutations of the BRS exhibited varying developmental defects, ranging from reduced thymic cellularity to a complete block in T cell development. Peripheral T cells from BRS-modified mice also exhibited several defects, including decreased TCR surface expression, reduced TCR-mediated signaling responses to agonist peptide-loaded APCs, and delayed CD3 epsilon localization to the immunological synapse. Overall, these findings demonstrate a functional role for the CD3 epsilon lipid-binding domain in T cell biology.
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Affiliation(s)
- Laura M. DeFord-Watts
- Department of Immunology, University of Texas Southwestern Medical Center, Dallas, Texas 75390
| | - Tara C. Tassin
- Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas, Texas 75390
| | - Amy M. Becker
- Department of Immunology, University of Texas Southwestern Medical Center, Dallas, Texas 75390
| | - Jennifer J. Medeiros
- Department of Immunology, University of Texas Southwestern Medical Center, Dallas, Texas 75390
| | - Joseph P. Albanesi
- Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas, Texas 75390
| | - Paul E. Love
- Laboratory of Mammalian Genes and Development, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland 20892
| | - Christoph Wülfing
- Department of Immunology, University of Texas Southwestern Medical Center, Dallas, Texas 75390
- Department of Cell Biology, University of Texas Southwestern Medical Center, Dallas, Texas 75390
| | - Nicolai S. C. van Oers
- Department of Immunology, University of Texas Southwestern Medical Center, Dallas, Texas 75390
- Department of Microbiology, University of Texas Southwestern Medical Center, Dallas, Texas 75390
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44
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Brodeur JF, Li S, Martins MDS, Larose L, Dave VP. Critical and Multiple Roles for the CD3ε Intracytoplasmic Tail in Double Negative to Double Positive Thymocyte Differentiation. THE JOURNAL OF IMMUNOLOGY 2009; 182:4844-53. [DOI: 10.4049/jimmunol.0803679] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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45
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Hubert FX, Kinkel SA, Crewther PE, Cannon PZF, Webster KE, Link M, Uibo R, O'Bryan MK, Meager A, Forehan SP, Smyth GK, Mittaz L, Antonarakis SE, Peterson P, Heath WR, Scott HS. Aire-deficient C57BL/6 mice mimicking the common human 13-base pair deletion mutation present with only a mild autoimmune phenotype. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2009; 182:3902-18. [PMID: 19265170 DOI: 10.4049/jimmunol.0802124] [Citation(s) in RCA: 96] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Autoimmune regulator (AIRE) is an important transcription regulator that mediates a role in central tolerance via promoting the "promiscuous" expression of tissue-specific Ags in the thymus. Although several mouse models of Aire deficiency have been described, none has analyzed the phenotype induced by a mutation that emulates the common 13-bp deletion in human APECED (autoimmune polyendocrinopathy-candidiasis-ectodermal dystrophy) by disrupting the first plant homeodomain in exon 8. Aire-deficient mice with a corresponding mutation showed some disturbance of the medullary epithelial compartment, but at the phenotypic level their T cell compartment appeared relatively normal in the thymus and periphery. An increase in the number of activated T cells was evident, and autoantibodies against several organs were detected. At the histological level, lymphocytic infiltration of several organs indicated the development of autoimmunity, although symptoms were mild and the quality of life for Aire-deficient mice appeared equivalent to wild-type littermates, with the exception of male infertility. Vbeta and CDR3 length analysis suggested that each Aire-deficient mouse developed its own polyclonal autoimmune repertoire. Finally, given the prevalence of candidiasis in APECED patients, we examined the control of infection with Candida albicans in Aire-deficient mice. No increase in disease susceptibility was found for either oral or systemic infection. These observations support the view that additional genetic and/or environmental factors contribute substantially to the overt nature of autoimmunity associated with Aire mutations, even for mutations identical to those found in humans with APECED.
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Affiliation(s)
- François-Xavier Hubert
- Division of Immunology, Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria, Australia
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46
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Polymorphisms in inflammation-related genes are associated with susceptibility to major depression and antidepressant response. Mol Psychiatry 2008; 13:800-12. [PMID: 18504423 PMCID: PMC2650233 DOI: 10.1038/mp.2008.59] [Citation(s) in RCA: 228] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
There are clinical parallels between the nature and course of depressive symptoms in major depressive disorder (MDD) and those of inflammatory disorders. However, the characterization of a possible immune system dysregulation in MDD has been challenging. Emerging data support the role of T-cell dysfunction. Here we report the association of MDD and antidepressant response to genes important in the modulation of the hypothalamic-pituitary-adrenal axis and immune functions in Mexican Americans with major depression. Specifically, single nucleotide polymorphisms (SNPs) in two genes critical for T-cell function are associated with susceptibility to MDD: PSMB4 (proteasome beta4 subunit), important for antigen processing, and TBX21 (T bet), critical for differentiation. Our analyses revealed a significant combined allele dose-effect: individuals who had one, two and three risk alleles were 2.3, 3.2 and 9.8 times more likely to have the diagnosis of MDD, respectively. We found associations of several SNPs and antidepressant response; those genes support the role of T cell (CD3E, PRKCH, PSMD9 and STAT3) and hypothalamic-pituitary-adrenal axis (UCN3) functions in treatment response. We also describe in MDD increased levels of CXCL10/IP-10, which decreased in response to antidepressants. This further suggests predominance of type 1 T-cell activity in MDD. T-cell function variations that we describe here may account for 47.8% of the attributable risk in Mexican Americans with moderate MDD. Immune function genes are highly variable; therefore, different genes might be implicated in distinct population groups.
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47
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Michie AM, Chan AC, Ciofani M, Carleton M, Lefebvre JM, He Y, Allman DM, Wiest DL, Zúñiga-Pflücker JC, Izon DJ. Constitutive Notch signalling promotes CD4 CD8 thymocyte differentiation in the absence of the pre-TCR complex, by mimicking pre-TCR signals. Int Immunol 2007; 19:1421-30. [PMID: 17981791 DOI: 10.1093/intimm/dxm113] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Notch1 signalling is essential for the commitment of multipotent lymphocyte precursors towards the alphabeta T-cell lineage and plays an important role in regulating beta-selection in CD4(-)CD8(-) double-negative (DN) thymocytes. However, the role played by Notch in promoting the development of CD4(+)CD8(+) double-positive (DP) thymocytes is poorly characterized. Here, we demonstrate that the introduction of a constitutively active Notch1 (ICN1) construct into RAG(-/-) lymphocyte precursors resulted in the generation of DP thymocytes in in vitro T-cell culture systems. Notably, developmental rescue was dependent not only on the presence of an intact Notch1 RAM domain but also on Delta-like signals, as ICN1-induced DP development in RAG(-/-) thymocytes occurred within an intact thymus or in OP9-DL1 co-cultures, but not in OP9-control co-cultures. Interestingly, ICN1 expression in SLP-76(-/-) precursors resulted in only a minimal developmental rescue to the immature CD8(+) single-positive stage, suggesting that Notch is utilizing the same signalling pathway as the pre-TCR complex. In support of this, ICN1 introduction resulted in the activation of the ERK-MAPK-signalling cascade in RAG(-/-) thymocytes. Taken together, these studies demonstrate that constitutive Notch signalling can bypass beta-selection during early T-cell development by inducing pre-TCR-like signals within a T-cell-promoting environment.
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Affiliation(s)
- Alison M Michie
- Division of Cancer Sciences and Molecular Pathology, Section of Experimental Haematology, Royal Infirmary, University of Glasgow, Glasgow, UK
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48
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Siegers GM, Swamy M, Fernández-Malavé E, Minguet S, Rathmann S, Guardo AC, Pérez-Flores V, Regueiro JR, Alarcón B, Fisch P, Schamel WWA. Different composition of the human and the mouse gammadelta T cell receptor explains different phenotypes of CD3gamma and CD3delta immunodeficiencies. ACTA ACUST UNITED AC 2007; 204:2537-44. [PMID: 17923503 PMCID: PMC2118495 DOI: 10.1084/jem.20070782] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The γδ T cell receptor for antigen (TCR) comprises the clonotypic TCRγδ, the CD3 (CD3γε and/or CD3δε), and the ζζ dimers. γδ T cells do not develop in CD3γ-deficient mice, whereas human patients lacking CD3γ have abundant peripheral blood γδ T cells expressing high γδ TCR levels. In an attempt to identify the molecular basis for these discordant phenotypes, we determined the stoichiometries of mouse and human γδ TCRs using blue native polyacrylamide gel electrophoresis and anti-TCR–specific antibodies. The γδ TCR isolated in digitonin from primary and cultured human γδ T cells includes CD3δ, with a TCRγδCD3ε2δγζ2 stoichiometry. In CD3γ-deficient patients, this may allow substitution of CD3γ by the CD3δ chain and thereby support γδ T cell development. In contrast, the mouse γδ TCR does not incorporate CD3δ and has a TCRγδCD3ε2γ2ζ2 stoichiometry. CD3γ-deficient mice exhibit a block in γδ T cell development. A human, but not a mouse, CD3δ transgene rescues γδ T cell development in mice lacking both mouse CD3δ and CD3γ chains. This suggests important structural and/or functional differences between human and mouse CD3δ chains during γδ T cell development. Collectively, our results indicate that the different γδ T cell phenotypes between CD3γ-deficient humans and mice can be explained by differences in their γδ TCR composition.
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Affiliation(s)
- Gabrielle M Siegers
- Max-Planck-Institute of Immunobiology and University of Freiburg, 79108 Freiburg, Germany
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49
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Stewart CA, Walzer T, Robbins SH, Malissen B, Vivier E, Prinz I. Germ-line and rearranged Tcrd transcription distinguish bona fide NK cells and NK-like gammadelta T cells. Eur J Immunol 2007; 37:1442-52. [PMID: 17492716 DOI: 10.1002/eji.200737354] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
NK cells and gammadelta T cells are distinct subsets of lymphocytes that contextually share multiple phenotypic and functional characteristics. However, the acquisition and the extent of these similarities remain poorly understood. Here, using T cell receptor delta locus-histone 2B-enhanced GFP (Tcrd-H2BEGFP) reporter mice, we show that germ-line transcription of Tcrd occurs in all maturing NK cells. We also describe a population of mouse NK-like cells that are indistinguishable from "bona fide" NK cells using standard protocols. Requirements for V(D)J recombination and a functional thymus, along with very low-level expression of surface TCRgammadelta but high intracellular CD3, define these cells as gammadelta T cells. "NK-like gammadelta T cells" are CD127+, have a memory-activated phenotype, express multiple NK cell receptors and readily produce interferon-gamma in response to IL-12/IL-18 stimulation. The close phenotypic resemblance between NK cells and NK-like gammadelta T cells is a source of experimental ambiguity in studies bridging NK and T cell biology, such as those on thymic NK cell development. Instead, it ascribes chronic TCRgammadelta engagement as a means of acquiring NK-like function.
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MESH Headings
- Adaptor Proteins, Signal Transducing/genetics
- Animals
- Antigens, Surface/metabolism
- Bone Marrow Cells/cytology
- Bone Marrow Cells/immunology
- Bone Marrow Cells/metabolism
- CD3 Complex/genetics
- CD3 Complex/metabolism
- Cell Lineage/immunology
- Cytokines/pharmacology
- Forkhead Transcription Factors/genetics
- Gene Expression
- Gene Rearrangement, delta-Chain T-Cell Antigen Receptor
- Histones/genetics
- Homeodomain Proteins/genetics
- Immunophenotyping
- Integrin alpha2/metabolism
- Interferon-gamma/metabolism
- Interleukin-2 Receptor beta Subunit/analysis
- Killer Cells, Natural/cytology
- Killer Cells, Natural/drug effects
- Killer Cells, Natural/metabolism
- Lectins, C-Type/metabolism
- Lysosomal-Associated Membrane Protein 1/metabolism
- Membrane Proteins/genetics
- Mice
- Mice, Inbred C57BL
- Mice, Knockout
- Mice, Nude
- Mice, Transgenic
- NK Cell Lectin-Like Receptor Subfamily B
- Phosphoproteins/genetics
- Receptors, Antigen, T-Cell, gamma-delta/genetics
- Receptors, Antigen, T-Cell, gamma-delta/metabolism
- T-Lymphocytes/cytology
- T-Lymphocytes/drug effects
- T-Lymphocytes/metabolism
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Affiliation(s)
- Charles A Stewart
- Centre d'Immunologie de Marseille-Luminy, Université de la Méditerranée, and Service d'Immunologie, Hôpital de Conception, Assistance Publique-Hôpitaux de Marseille, France.
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50
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Akl H, Badran B, Dobirta G, Manfouo-Foutsop G, Moschitta M, Merimi M, Burny A, Martiat P, Willard-Gallo KE. Progressive loss of CD3 expression after HTLV-I infection results from chromatin remodeling affecting all the CD3 genes and persists despite early viral genes silencing. Virol J 2007; 4:85. [PMID: 17822534 PMCID: PMC2042505 DOI: 10.1186/1743-422x-4-85] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2007] [Accepted: 09/06/2007] [Indexed: 11/25/2022] Open
Abstract
Background HTLV-I infected CD4+ T-cells lines usually progress towards a CD3- or CD3low phenotype. In this paper, we studied expression, kinetics, chromatin remodeling of the CD3 gene at different time-points post HTLV-I infection. Results The onset of this phenomenon coincided with a decrease of CD3γ followed by the subsequent progressive reduction in CD3δ, then CD3ε and CD3ζ mRNA. Transient transfection experiments showed that the CD3γ promoter was still active in CD3- HTLV-I infected cells demonstrating that adequate amounts of the required transcription factors were available. We next looked at whether epigenetic mechanisms could be responsible for this progressive decrease in CD3 expression using DNase I hypersensitivity (DHS) experiments examining the CD3γ and CD3δ promoters and the CD3δ enhancer. In uninfected and cells immediately post-infection all three DHS sites were open, then the CD3γ promoter became non accessible, and this was followed by a sequential closure of all the DHS sites corresponding to all three transcriptional control regions. Furthermore, a continuous decrease of in vivo bound transcription initiation factors to the CD3γ promoter was observed after silencing of the viral genome. Coincidently, cells with a lower expression of CD3 grew more rapidly. Conclusion We conclude that HTLV-I infection initiates a process leading to a complete loss of CD3 membrane expression by an epigenetic mechanism which continues along time, despite an early silencing of the viral genome. Whether CD3 progressive loss is an epiphenomenon or a causal event in the process of eventual malignant transformation remains to be investigated.
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Affiliation(s)
- Haidar Akl
- Laboratory of Experimental Hematology, Institut Jules Bordet, Université Libre de Bruxelles (ULB), 121, Boulevard de waterloo, 1000, Brussels, Belgium
| | - Bassam Badran
- Laboratory of Experimental Hematology, Institut Jules Bordet, Université Libre de Bruxelles (ULB), 121, Boulevard de waterloo, 1000, Brussels, Belgium
| | - Gratiela Dobirta
- Laboratory of Experimental Hematology, Institut Jules Bordet, Université Libre de Bruxelles (ULB), 121, Boulevard de waterloo, 1000, Brussels, Belgium
| | - Germain Manfouo-Foutsop
- Molecular Immunology Unit, Institut Jules Bordet, Université Libre de Bruxelles (ULB), 127, Boulevard de waterloo, 1000, Brussels, Belgium
| | - Maria Moschitta
- Laboratory of Experimental Hematology, Institut Jules Bordet, Université Libre de Bruxelles (ULB), 121, Boulevard de waterloo, 1000, Brussels, Belgium
| | - Makram Merimi
- Laboratory of Experimental Hematology, Institut Jules Bordet, Université Libre de Bruxelles (ULB), 121, Boulevard de waterloo, 1000, Brussels, Belgium
| | - Arsène Burny
- Laboratory of Experimental Hematology, Institut Jules Bordet, Université Libre de Bruxelles (ULB), 121, Boulevard de waterloo, 1000, Brussels, Belgium
| | - Philippe Martiat
- Laboratory of Experimental Hematology, Institut Jules Bordet, Université Libre de Bruxelles (ULB), 121, Boulevard de waterloo, 1000, Brussels, Belgium
| | - Karen E Willard-Gallo
- Molecular Immunology Unit, Institut Jules Bordet, Université Libre de Bruxelles (ULB), 127, Boulevard de waterloo, 1000, Brussels, Belgium
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