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Lam N, Lee Y, Farber DL. A guide to adaptive immune memory. Nat Rev Immunol 2024:10.1038/s41577-024-01040-6. [PMID: 38831162 DOI: 10.1038/s41577-024-01040-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/26/2024] [Indexed: 06/05/2024]
Abstract
Immune memory - comprising T cells, B cells and plasma cells and their secreted antibodies - is crucial for human survival. It enables the rapid and effective clearance of a pathogen after re-exposure, to minimize damage to the host. When antigen-experienced, memory T cells become activated, they proliferate and produce effector molecules at faster rates and in greater magnitudes than antigen-inexperienced, naive cells. Similarly, memory B cells become activated and differentiate into antibody-secreting cells more rapidly than naive B cells, and they undergo processes that increase their affinity for antigen. The ability of T cells and B cells to form memory cells after antigen exposure is the rationale behind vaccination. Understanding immune memory not only is crucial for the design of more-efficacious vaccines but also has important implications for immunotherapies in infectious disease and cancer. This 'guide to' article provides an overview of the current understanding of the phenotype, function, location, and pathways for the generation, maintenance and protective capacity of memory T cells and memory B cells.
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Affiliation(s)
- Nora Lam
- Department of Pathology and Cell Biology, Columbia University Irving Medical Center, New York, NY, USA
| | - YoonSeung Lee
- Department of Microbiology and Immunology, Columbia University Irving Medical Center, New York, NY, USA
| | - Donna L Farber
- Department of Microbiology and Immunology, Columbia University Irving Medical Center, New York, NY, USA.
- Department of Surgery, Columbia University Irving Medical Center, New York, NY, USA.
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2
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Hyun J, Kim SJ, Cho SD, Kim HW. Mechano-modulation of T cells for cancer immunotherapy. Biomaterials 2023; 297:122101. [PMID: 37023528 DOI: 10.1016/j.biomaterials.2023.122101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Revised: 03/12/2023] [Accepted: 03/23/2023] [Indexed: 04/03/2023]
Abstract
Immunotherapy, despite its promise for future anti-cancer approach, faces significant challenges, such as off-tumor side effects, innate or acquired resistance, and limited infiltration of immune cells into stiffened extracellular matrix (ECM). Recent studies have highlighted the importance of mechano-modulation/-activation of immune cells (mainly T cells) for effective caner immunotherapy. Immune cells are highly sensitive to the applied physical forces and matrix mechanics, and reciprocally shape the tumor microenvironment. Engineering T cells with tuned properties of materials (e.g., chemistry, topography, and stiffness) can improve their expansion and activation ex vivo, and their ability to mechano-sensing the tumor specific ECM in vivo where they perform cytotoxic effects. T cells can also be exploited to secrete enzymes that soften ECM, thus increasing tumor infiltration and cellular therapies. Furthermore, T cells, such as chimeric antigen receptor (CAR)-T cells, genomic engineered to be spatiotemporally controllable by physical stimuli (e.g., ultrasound, heat, or light), can mitigate adverse off-tumor effects. In this review, we communicate these recent cutting-edge endeavors devoted to mechano-modulating/-activating T cells for effective cancer immunotherapy, and discuss future prospects and challenges in this field.
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3
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Yuan X, Ma S, Fa B, Wei T, Ma Y, Wang Y, Lv W, Zhang Y, Zheng J, Chen G, Sun J, Yu Z. A high-efficiency differential expression method for cancer heterogeneity using large-scale single-cell RNA-sequencing data. Front Genet 2022; 13:1063130. [DOI: 10.3389/fgene.2022.1063130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Accepted: 11/14/2022] [Indexed: 12/03/2022] Open
Abstract
Colorectal cancer is a highly heterogeneous disease. Tumor heterogeneity limits the efficacy of cancer treatment. Single-cell RNA-sequencing technology (scRNA-seq) is a powerful tool for studying cancer heterogeneity at cellular resolution. The sparsity, heterogeneous diversity, and fast-growing scale of scRNA-seq data pose challenges to the flexibility, accuracy, and computing efficiency of the differential expression (DE) methods. We proposed HEART (high-efficiency and robust test), a statistical combination test that can detect DE genes with various sources of differences beyond mean expression changes. To validate the performance of HEART, we compared HEART and the other six popular DE methods on various simulation datasets with different settings by two simulation data generation mechanisms. HEART had high accuracy (F1 score >0.75) and brilliant computational efficiency (less than 2 min) on multiple simulation datasets in various experimental settings. HEART performed well on DE genes detection for the PBMC68K dataset quantified by UMI counts and the human brain single-cell dataset quantified by read counts (F1 score = 0.79, 0.65). By applying HEART to the single-cell dataset of a colorectal cancer patient, we found several potential blood-based biomarkers (CTTN, S100A4, S100A6, UBA52, FAU, and VIM) associated with colorectal cancer metastasis and validated them on additional spatial transcriptomic data of other colorectal cancer patients.
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4
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Altered expression response upon repeated gene repression in single yeast cells. PLoS Comput Biol 2022; 18:e1010640. [PMID: 36256678 PMCID: PMC9633002 DOI: 10.1371/journal.pcbi.1010640] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2022] [Revised: 11/03/2022] [Accepted: 10/05/2022] [Indexed: 11/06/2022] Open
Abstract
Cells must continuously adjust to changing environments and, thus, have evolved mechanisms allowing them to respond to repeated stimuli. While faster gene induction upon a repeated stimulus is known as reinduction memory, responses to repeated repression have been less studied so far. Here, we studied gene repression across repeated carbon source shifts in over 1,500 single Saccharomyces cerevisiae cells. By monitoring the expression of a carbon source-responsive gene, galactokinase 1 (Gal1), and fitting a mathematical model to the single-cell data, we observed a faster response upon repeated repressions at the population level. Exploiting our single-cell data and quantitative modeling approach, we discovered that the faster response is mediated by a shortened repression response delay, the estimated time between carbon source shift and Gal1 protein production termination. Interestingly, we can exclude two alternative hypotheses, i) stronger dilution because of e.g., increased proliferation, and ii) a larger fraction of repressing cells upon repeated repressions. Collectively, our study provides a quantitative description of repression kinetics in single cells and allows us to pinpoint potential mechanisms underlying a faster response upon repeated repression. The computational results of our study can serve as the starting point for experimental follow-up studies. Cells have to continuously adjust to their environment and cope with changing temperature, stress conditions, or metabolic resources. Yeast cells exposed to repeated carbon source shifts have shown to be “primed” by their first exposure, exhibiting enhanced gene expression of specific genes later on. However, how cells respond to a repeated repressive stimulus, e.g., withdrawal of metabolic resources, has been so far much less studied. For this, we investigated the expression kinetics of a carbon source-responsive gene across repeated repressions. We measured single-cell expression and used mathematical modeling to evaluate potential causes underlying an observed faster repression response upon a repeated stimulus. Specifically, we investigated whether i) an increased dilution due to e.g., proliferation, ii) an increased fraction of repressing cells, or iii) different kinetic parameters in the repeated repression cause the observed faster response in the second repression. Leveraging quantitative mathematical model comparison, we discovered that the faster response is mediated by a shortened estimated time between carbon source shift and protein production termination at the single-cell level. Our study provides a quantitative description of repression kinetics in single cells and allows us to pinpoint potential mechanisms underlying a faster response upon repeated repression.
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Abrams RE, Pierre K, El-Murr N, Seung E, Wu L, Luna E, Mehta R, Li J, Larabi K, Ahmed M, Pelekanou V, Yang ZY, van de Velde H, Stamatelos SK. Quantitative systems pharmacology modeling sheds light into the dose response relationship of a trispecific T cell engager in multiple myeloma. Sci Rep 2022; 12:10976. [PMID: 35768621 PMCID: PMC9243109 DOI: 10.1038/s41598-022-14726-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Accepted: 06/10/2022] [Indexed: 02/08/2023] Open
Abstract
In relapsed and refractory multiple myeloma (RRMM), there are few treatment options once patients progress from the established standard of care. Several bispecific T-cell engagers (TCE) are in clinical development for multiple myeloma (MM), designed to promote T-cell activation and tumor killing by binding a T-cell receptor and a myeloma target. In this study we employ both computational and experimental tools to investigate how a novel trispecific TCE improves activation, proliferation, and cytolytic activity of T-cells against MM cells. In addition to binding CD3 on T-cells and CD38 on tumor cells, the trispecific binds CD28, which serves as both co-stimulation for T-cell activation and an additional tumor target. We have established a robust rule-based quantitative systems pharmacology (QSP) model trained against T-cell activation, cytotoxicity, and cytokine data, and used it to gain insight into the complex dose response of this drug. We predict that CD3-CD28-CD38 killing capacity increases rapidly in low dose levels, and with higher doses, killing plateaus rather than following the bell-shaped curve typical of bispecific TCEs. We further predict that dose–response curves are driven by the ability of tumor cells to form synapses with activated T-cells. When competition between cells limits tumor engagement with active T-cells, response to therapy may be diminished. We finally suggest a metric related to drug efficacy in our analysis—“effective” receptor occupancy, or the proportion of receptors engaged in synapses. Overall, this study predicts that the CD28 arm on the trispecific antibody improves efficacy, and identifies metrics to inform potency of novel TCEs.
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Affiliation(s)
- R E Abrams
- Sanofi, 55 Corporate Dr, Bridgewater, NJ, 08807, USA.,Daichi Sankyo, 211 Mt. Airy Rd., Basking Ridge, NJ, 07920, USA
| | - K Pierre
- Sanofi, 55 Corporate Dr, Bridgewater, NJ, 08807, USA.
| | - N El-Murr
- Sanofi, 13 quai Jules Guesde 94403 Cedex, VITRY-SUR-SEINE, Vitry/Alfortville, France
| | - E Seung
- Sanofi, 270 Albany St., Cambridge, MA, 02139, USA.,Modex Therapeutics, 22 Strathmore Road, Natick, MA, 01760, USA
| | - L Wu
- Sanofi, 270 Albany St., Cambridge, MA, 02139, USA.,Modex Therapeutics, 22 Strathmore Road, Natick, MA, 01760, USA
| | | | | | - J Li
- Sanofi, 55 Corporate Dr, Bridgewater, NJ, 08807, USA
| | - K Larabi
- Sanofi, 13 quai Jules Guesde 94403 Cedex, VITRY-SUR-SEINE, Vitry/Alfortville, France
| | - M Ahmed
- Sanofi, 50 Binney St., Cambridge, MA, 02142, USA
| | - V Pelekanou
- Sanofi, 50 Binney St., Cambridge, MA, 02142, USA.,Bayer Pharmaceuticals, Cambridge, MA, 02142, USA
| | - Z-Y Yang
- Sanofi, 270 Albany St., Cambridge, MA, 02139, USA.,Modex Therapeutics, 22 Strathmore Road, Natick, MA, 01760, USA
| | | | - S K Stamatelos
- Sanofi, 55 Corporate Dr, Bridgewater, NJ, 08807, USA. .,Bayer Pharmaceuticals, PH100 Bayer Boulevard, Whippany, NJ, 07981, USA.
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6
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Monian B, Tu AA, Ruiter B, Morgan DM, Petrossian PM, Smith NP, Gierahn TM, Ginder JH, Shreffler WG, Love JC. Peanut oral immunotherapy differentially suppresses clonally distinct subsets of T helper cells. J Clin Invest 2021; 132:150634. [PMID: 34813505 PMCID: PMC8759778 DOI: 10.1172/jci150634] [Citation(s) in RCA: 38] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Accepted: 11/18/2021] [Indexed: 11/18/2022] Open
Abstract
Food allergy affects an estimated 8% of children in the United States. Oral immunotherapy (OIT) is a recently approved treatment, with outcomes ranging from sustained tolerance to food allergens to no apparent benefit. The immunological underpinnings that influence clinical outcomes of OIT remain largely unresolved. Using single-cell RNA-Seq and paired T cell receptor α/β (TCRα/β) sequencing, we assessed the transcriptomes of CD154+ and CD137+ peanut-reactive T helper (Th) cells from 12 patients with peanut allergy longitudinally throughout OIT. We observed expanded populations of cells expressing Th1, Th2, and Th17 signatures that further separated into 6 clonally distinct subsets. Four of these subsets demonstrated a convergence of TCR sequences, suggesting antigen-driven T cell fates. Over the course of OIT, we observed suppression of Th2 and Th1 gene signatures in effector clonotypes but not T follicular helper–like (Tfh-like) clonotypes. Positive outcomes were associated with stronger suppression of Th2 signatures in Th2A-like cells, while treatment failure was associated with the expression of baseline inflammatory gene signatures that were present in Th1 and Th17 cell populations and unmodulated by OIT. These results demonstrate that differential clinical responses to OIT are associated with both preexisting characteristics of peanut-reactive CD4+ T cells and suppression of a subset of Th2 cells.
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Affiliation(s)
- Brinda Monian
- Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, United States of America
| | - Ang A Tu
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, United States of America
| | - Bert Ruiter
- Center for Immunology and Inflammatory Diseases, Massachusetts General Hospital, Boston, United States of America
| | - Duncan M Morgan
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, United States of America
| | - Patrick M Petrossian
- Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, United States of America
| | - Neal P Smith
- Center for Immunology and Inflammatory Diseases, Massachusetts General Hospital, Boston, United States of America
| | - Todd M Gierahn
- Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, United States of America
| | - Julia H Ginder
- Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, United States of America
| | - Wayne G Shreffler
- Center for Immunology and Inflammatory Diseases, Massachusetts General Hospital, Boston, United States of America
| | - J Christopher Love
- Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, United States of America
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7
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Park JW, Kim OH, Lee SC, Kim KH, Hong HE, Seo H, Choi HJ, Kim SJ. Serum level of visfatin can reflect the severity of inflammation in patients with acute cholecystitis. Ann Surg Treat Res 2020; 99:26-36. [PMID: 32676479 PMCID: PMC7332317 DOI: 10.4174/astr.2020.99.1.26] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Revised: 03/02/2020] [Accepted: 04/07/2020] [Indexed: 12/29/2022] Open
Abstract
Purpose Visfatin is a key cytokine released from the pe ripheral blood mononuclear cells (PBMCs) as well as adipose tissue, and it is involved in immune response as well as inflammation. In this study, we investigated whether the serum visfatin level could be a prognostic factor for predicting the severity of inflammation in patients with acute cholecystitis. Methods We examined the blood samples and gallbladder specimens from patients who underwent laparoscopic cholecystectomy for either acute (n = 18) or chronic cholecystitis (n = 18). We determined the visfatin levels of these samples using various procedures such as real-time polymerase chain reaction, enzyme-linked immunosorbent assay, western blotting, and immunohistochemistry. Results The patients with acute cholecystitis exhibited higher mRNA expression of visfatin in PBMCs, higher serum levels of visfatin, and increased protein expression of visfatin in the gallbladder specimens than in patients with chronic cholecystitis. In the in vitro model of acute cholecystitis, the mRNA expression of visfatin showed the fastest increase among the other pro-inflammatory mediators studied, including interleukin (IL)-10, tumor necrosis factor-α, IL-6, intracellular adhesion molecule-1, and ascular cell adhesion molecule-1. Inhibition of visfatin using siRNA abrogated the inhibitory effects of lipopolysaccharide (LPS) on the expression of ABCG1 in GBECs, suggesting that visfatin is significantly involved in the LPS-driven suppression of ABCG1. Conclusion Taken together, we concluded that visfatin is a pro-inflammatory mediators that is upregulated during acute cholecystitis and is expected to be increased within a short time after inflammation. Therefore, measuring the serum level of visfatin would be helpful in predicting the inflammatory severity in the patients with acute cholecystitis.
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Affiliation(s)
- Jae Woo Park
- Department of Surgery, Daejeon St. Mary's Hospital, The Catholic University of Korea, Seoul, Korea
| | - Ok-Hee Kim
- Department of Surgery, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.,Catholic Central Laboratory of Surgery, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Sang Chul Lee
- Department of Surgery, Daejeon St. Mary's Hospital, The Catholic University of Korea, Seoul, Korea.,Catholic Central Laboratory of Surgery, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Kee-Hwan Kim
- Catholic Central Laboratory of Surgery, College of Medicine, The Catholic University of Korea, Seoul, Korea.,Department of Surgery, Uijeongbu St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Ha-Eun Hong
- Department of Surgery, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.,Catholic Central Laboratory of Surgery, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Haeyeon Seo
- Department of Surgery, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.,Catholic Central Laboratory of Surgery, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Ho Joong Choi
- Department of Surgery, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Say-June Kim
- Department of Surgery, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.,Catholic Central Laboratory of Surgery, College of Medicine, The Catholic University of Korea, Seoul, Korea
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Tu WJ, Hardy K, Sutton CR, McCuaig R, Li J, Dunn J, Tan A, Brezar V, Morris M, Denyer G, Lee SK, Turner SJ, Seddiki N, Smith C, Khanna R, Rao S. Priming of transcriptional memory responses via the chromatin accessibility landscape in T cells. Sci Rep 2017; 7:44825. [PMID: 28317936 PMCID: PMC5357947 DOI: 10.1038/srep44825] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2016] [Accepted: 02/14/2017] [Indexed: 12/17/2022] Open
Abstract
Memory T cells exhibit transcriptional memory and “remember” their previous pathogenic encounter to increase transcription on re-infection. However, how this transcriptional priming response is regulated is unknown. Here we performed global FAIRE-seq profiling of chromatin accessibility in a human T cell transcriptional memory model. Primary activation induced persistent accessibility changes, and secondary activation induced secondary-specific opening of previously less accessible regions associated with enhanced expression of memory-responsive genes. Increased accessibility occurred largely in distal regulatory regions and was associated with increased histone acetylation and relative H3.3 deposition. The enhanced re-stimulation response was linked to the strength of initial PKC-induced signalling, and PKC-sensitive increases in accessibility upon initial stimulation showed higher accessibility on re-stimulation. While accessibility maintenance was associated with ETS-1, accessibility at re-stimulation-specific regions was linked to NFAT, especially in combination with ETS-1, EGR, GATA, NFκB, and NR4A. Furthermore, NFATC1 was directly regulated by ETS-1 at an enhancer region. In contrast to the factors that increased accessibility, signalling from bHLH and ZEB family members enhanced decreased accessibility upon re-stimulation. Interplay between distal regulatory elements, accessibility, and the combined action of sequence-specific transcription factors allows transcriptional memory-responsive genes to “remember” their initial environmental encounter.
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Affiliation(s)
- Wen Juan Tu
- Faculty of Education, Science, Technology &Mathematics, University of Canberra, Canberra, Australian Capital Territory 2617, Australia
| | - Kristine Hardy
- Faculty of Education, Science, Technology &Mathematics, University of Canberra, Canberra, Australian Capital Territory 2617, Australia
| | - Christopher R Sutton
- Faculty of Education, Science, Technology &Mathematics, University of Canberra, Canberra, Australian Capital Territory 2617, Australia
| | - Robert McCuaig
- Faculty of Education, Science, Technology &Mathematics, University of Canberra, Canberra, Australian Capital Territory 2617, Australia
| | - Jasmine Li
- Department of Microbiology, Biomedical Discovery Institute, Monash University, Clayton, Victoria 3800, Australia.,Department of Microbiology &Immunology, The Doherty Institute for Infection and Immunity, University of Melbourne, Victoria 3010, Australia
| | - Jenny Dunn
- Faculty of Education, Science, Technology &Mathematics, University of Canberra, Canberra, Australian Capital Territory 2617, Australia
| | - Abel Tan
- Faculty of Education, Science, Technology &Mathematics, University of Canberra, Canberra, Australian Capital Territory 2617, Australia
| | - Vedran Brezar
- INSERM U955 Eq16 Faculte de medicine Henri Mondor and Universite Paris-Est, Creteil/Vaccine Research Institute, Creteil 94010, France
| | - Melanie Morris
- Faculty of Education, Science, Technology &Mathematics, University of Canberra, Canberra, Australian Capital Territory 2617, Australia
| | - Gareth Denyer
- School of Molecular Bioscience, The University of Sydney, Sydney, NSW, Australia
| | - Sau Kuen Lee
- QIMR Berghofer Centre for Immunotherapy and Vaccine Development QIMR Berghofer Medical Research Institute, Brisbane, Queensland, Australia.,Tumour Immunology Laboratory, Department of Immunology, QIMR Berghofer Medical Research Institute, Brisbane, Queensland, Australia
| | - Stephen J Turner
- Department of Microbiology, Biomedical Discovery Institute, Monash University, Clayton, Victoria 3800, Australia.,Department of Microbiology &Immunology, The Doherty Institute for Infection and Immunity, University of Melbourne, Victoria 3010, Australia
| | - Nabila Seddiki
- INSERM U955 Eq16 Faculte de medicine Henri Mondor and Universite Paris-Est, Creteil/Vaccine Research Institute, Creteil 94010, France
| | - Corey Smith
- QIMR Berghofer Centre for Immunotherapy and Vaccine Development QIMR Berghofer Medical Research Institute, Brisbane, Queensland, Australia.,Tumour Immunology Laboratory, Department of Immunology, QIMR Berghofer Medical Research Institute, Brisbane, Queensland, Australia
| | - Rajiv Khanna
- QIMR Berghofer Centre for Immunotherapy and Vaccine Development QIMR Berghofer Medical Research Institute, Brisbane, Queensland, Australia.,Tumour Immunology Laboratory, Department of Immunology, QIMR Berghofer Medical Research Institute, Brisbane, Queensland, Australia
| | - Sudha Rao
- Faculty of Education, Science, Technology &Mathematics, University of Canberra, Canberra, Australian Capital Territory 2617, Australia
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Thauland TJ, Hu KH, Bruce MA, Butte MJ. Cytoskeletal adaptivity regulates T cell receptor signaling. Sci Signal 2017; 10:10/469/eaah3737. [PMID: 28270556 DOI: 10.1126/scisignal.aah3737] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
The factors that govern T cell activation control the initiation and progression of adaptive immune responses. T cells recognize their cognate antigen on the surface of antigen-presenting cells (APCs) through the T cell receptor, which results in the formation of a contact region (immune synapse) between the two cells and the activation of the T cells. Activated T cells proliferate and differentiate into effector T cells that secrete cytokines, provide help to B cells, and kill target cells. We asked whether the actin cytoskeleton governs differences in signaling in effector T cells versus naïve (unstimulated) T cells. Using atomic force microscopy and quantitative confocal microscopy, we found that naïve T cells had a mechanically stiffer cortical cytoskeleton than that of effector cells, which resulted in naïve cells forming smaller immune synapses with APCs. This suggests that the cytoskeletal stiffness of the T cell before it undergoes antigen stimulation predicts its subsequent dynamic engagement with APCs and its activation potential. Cytoskeletal rigidity depended on the activity of the actin-severing enzyme cofilin through a pathway requiring the small guanosine triphosphatase RhoA and the kinases ROCK (Rho-activated kinase) and LIMK. These findings suggest that the baseline cytoskeletal state controls T cell responses and that the underlying pathway could be a therapeutic target for modulating adaptive immunity.
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Affiliation(s)
- Timothy J Thauland
- Stanford Immunology, Stanford University, Stanford, CA 94305, USA.,Division of Immunology, Allergy, and Rheumatology, Department of Pediatrics, Stanford University, Stanford, CA 94305, USA
| | - Kenneth H Hu
- Stanford Biophysics, Stanford University, Stanford, CA 94305, USA
| | - Marc A Bruce
- Stanford Immunology, Stanford University, Stanford, CA 94305, USA
| | - Manish J Butte
- Stanford Immunology, Stanford University, Stanford, CA 94305, USA. .,Division of Immunology, Allergy, and Rheumatology, Department of Pediatrics, Stanford University, Stanford, CA 94305, USA.,Stanford Biophysics, Stanford University, Stanford, CA 94305, USA
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10
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Proietti C, Zakrzewski M, Watkins TS, Berger B, Hasan S, Ratnatunga CN, Brion MJ, Crompton PD, Miles JJ, Doolan DL, Krause L. Mining, visualizing and comparing multidimensional biomolecular data using the Genomics Data Miner (GMine) Web-Server. Sci Rep 2016; 6:38178. [PMID: 27922118 PMCID: PMC5138638 DOI: 10.1038/srep38178] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2016] [Accepted: 11/04/2016] [Indexed: 12/21/2022] Open
Abstract
Genomics Data Miner (GMine) is a user-friendly online software that allows non-experts to mine, cluster and compare multidimensional biomolecular datasets. Various powerful visualization techniques are provided, generating high quality figures that can be directly incorporated into scientific publications. Robust and comprehensive analyses are provided via a broad range of data-mining techniques, including univariate and multivariate statistical analysis, supervised learning, correlation networks, clustering and multivariable regression. The software has a focus on multivariate techniques, which can attribute variance in the measurements to multiple explanatory variables and confounders. Various normalization methods are provided. Extensive help pages and a tutorial are available via a wiki server. Using GMine we reanalyzed proteome microarray data of host antibody response against Plasmodium falciparum. Our results support the hypothesis that immunity to malaria is a higher-order phenomenon related to a pattern of responses and not attributable to any single antigen. We also analyzed gene expression across resting and activated T cells, identifying many immune-related genes with differential expression. This highlights both the plasticity of T cells and the operation of a hardwired activation program. These application examples demonstrate that GMine facilitates an accurate and in-depth analysis of complex molecular datasets, including genomics, transcriptomics and proteomics data.
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Affiliation(s)
- Carla Proietti
- QIMR Berghofer Medical Research Institute, Brisbane, QLD, Australia
| | | | - Thomas S Watkins
- QIMR Berghofer Medical Research Institute, Brisbane, QLD, Australia
| | - Bernard Berger
- Nestlé Research Centre, Vers-chez-les-Blanc, Lausanne, Switzerland
| | - Shihab Hasan
- QIMR Berghofer Medical Research Institute, Brisbane, QLD, Australia.,The University of Queensland Diamantina Institute, The University of Queensland, Translational Research Institute, Brisbane, QLD, Australia
| | | | - Marie-Jo Brion
- The University of Queensland Diamantina Institute, The University of Queensland, Translational Research Institute, Brisbane, QLD, Australia
| | - Peter D Crompton
- Malaria Infection Biology and Immunity Unit, Laboratory of Immunogenetics, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, Maryland 20852, USA
| | - John J Miles
- QIMR Berghofer Medical Research Institute, Brisbane, QLD, Australia.,Centre for Biosecurity and Tropical Infectious Diseases, Australian Institute of Tropical Health &Medicine, James Cook University, Cairns, QLD, Australia
| | - Denise L Doolan
- QIMR Berghofer Medical Research Institute, Brisbane, QLD, Australia.,Centre for Biosecurity and Tropical Infectious Diseases, Australian Institute of Tropical Health &Medicine, James Cook University, Cairns, QLD, Australia
| | - Lutz Krause
- QIMR Berghofer Medical Research Institute, Brisbane, QLD, Australia.,The University of Queensland Diamantina Institute, The University of Queensland, Translational Research Institute, Brisbane, QLD, Australia
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11
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Arsenio J, Metz PJ, Chang JT. Asymmetric Cell Division in T Lymphocyte Fate Diversification. Trends Immunol 2015; 36:670-683. [PMID: 26474675 DOI: 10.1016/j.it.2015.09.004] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2015] [Revised: 09/11/2015] [Accepted: 09/14/2015] [Indexed: 12/21/2022]
Abstract
Immunological protection against microbial pathogens is dependent on robust generation of functionally diverse T lymphocyte subsets. Upon microbial infection, naïve CD4(+) or CD8(+) T lymphocytes can give rise to effector- and memory-fated progeny that together mediate a potent immune response. Recent advances in single-cell immunological and genomic profiling technologies have helped elucidate early and late diversification mechanisms that enable the generation of heterogeneity from single T lymphocytes. We discuss these findings here and argue that one such mechanism, asymmetric cell division, creates an early divergence in T lymphocyte fates by giving rise to daughter cells with a propensity towards the terminally differentiated effector or self-renewing memory lineages, with cell-intrinsic and -extrinsic cues from the microenvironment driving the final maturation steps.
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Affiliation(s)
- Janilyn Arsenio
- Department of Medicine, University of California San Diego, La Jolla, CA 92093, USA
| | - Patrick J Metz
- Department of Medicine, University of California San Diego, La Jolla, CA 92093, USA
| | - John T Chang
- Department of Medicine, University of California San Diego, La Jolla, CA 92093, USA.
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12
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Xiao K, Zou WH, Yang Z, Rehman ZU, Ansari AR, Yuan HR, Zhou Y, Cui L, Peng KM, Song H. The role of visfatin on the regulation of inflammation and apoptosis in the spleen of LPS-treated rats. Cell Tissue Res 2014; 359:605-618. [PMID: 25358398 DOI: 10.1007/s00441-014-1997-3] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2014] [Accepted: 08/21/2014] [Indexed: 01/01/2023]
Abstract
The purpose of the present study is to determine if visfatin is involved in inflammation or apoptosis induced by LPS in rat. Forty Wistar rats were divided into four groups: saline group, LPS group, visfatin group and Visfatin + LPS co-stimulated group. Spleen samples from each group of rats were collected for study. The spleen structure was examined by histological imaging. Apoptosis was evaluated with TUNEL reaction. Caspase-3 was detected with immunohistochemistry and western blot. The apoptosis-related genes were detected by qPCR and inflammatory cytokines were tested by ELISA. Our main findings were as follows. (1) Macrophages were markedly increased in the visfatin group compared with the saline group. This finding was confirmed when spleen samples were examined with western blot using CD68 antibody. (2) Visfatin promoted the expression of CD68 and caspase-3 in rat spleen, whereas visfatin could inhibit the expression of CD68 and activated caspase-3 in spleen of LPS-induced acute inflammation. (3) Visfatin had a pro-apoptotic effect on normal rat spleen, whereas it exerted an anti-apoptotic effect during LPS-induced lymphocytes apoptosis in rat spleen. Moreover, the effect of visfatin on cell apoptosis was mediated by the mitochondrial pathway. (4) Visfatin could modulate both the anti-inflammatory cytokines and pro-inflammatory cytokines in rat spleen, such as IL-10, IL-4, IL-6, TNF-α and IL-1β. Taken together, we demonstrate that visfatin could participate in the inflammatory process in rat spleen by modulating the macrophages and inflammatory cytokines. Also, visfatin plays a dual role in the apoptosis in rat spleen, which is mediated by the mitochondrial pathway.
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Affiliation(s)
- Ke Xiao
- College of Animal Science and Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, China
| | - Wei-Hua Zou
- College of Plant Science & Technology, Huazhong Agricultural University, Wuhan, 430070, China
| | - Zhi Yang
- College of Animal Science and Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, China
| | - Zia Ur Rehman
- College of Animal Science and Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, China
| | - Abdur Rahman Ansari
- College of Veterinary and Animal Sciences, Jhang University of Veterinary and Animal Sciences, Lahore, Pakistan
| | - Huai-Rui Yuan
- College of Animal Science and Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, China
| | - Ying Zhou
- College of Animal Science and Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, China
| | - Lu Cui
- College of Animal Science and Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, China
| | - Ke-Mei Peng
- College of Animal Science and Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, China
| | - Hui Song
- College of Animal Science and Veterinary Medicine, Huazhong Agricultural University, Wuhan, 430070, China.
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Koorella C, Nair JR, Murray ME, Carlson LM, Watkins SK, Lee KP. Novel regulation of CD80/CD86-induced phosphatidylinositol 3-kinase signaling by NOTCH1 protein in interleukin-6 and indoleamine 2,3-dioxygenase production by dendritic cells. J Biol Chem 2014; 289:7747-62. [PMID: 24415757 DOI: 10.1074/jbc.m113.519686] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Dendritic cells (DC) play a critical role in modulating antigen-specific immune responses elicited by T cells via engagement of the prototypic T cell costimulatory receptor CD28 by the cognate ligands CD80/CD86, expressed on DC. Although CD28 signaling in T cell activation has been well characterized, it has only recently been shown that CD80/CD86, which have no demonstrated binding domains for signaling proteins in their cytoplasmic tails, nonetheless also transduce signals to the DC. Functionally, CD80/CD86 engagement results in DC production of the pro-inflammatory cytokine IL-6, which is necessary for full T cell activation. However, ligation of CD80/CD86 by CTLA4 also induces DC production of the immunosuppressive enzyme indoleamine 2,3-dioxygenase (IDO), which depletes local pools of the essential amino acid tryptophan, resulting in blockade of T cell activation. Despite the significant role of CD80/CD86 in immunological processes and the seemingly opposing roles they play by producing IL-6 and IDO upon their activation, how CD80/CD86 signal remains poorly understood. We have now found that cross-linking CD80/CD86 in human DC activates the PI3K/AKT pathway. This results in phosphorylation/inactivation of its downstream target, FOXO3A, and alleviates FOXO3A-mediated suppression of IL-6 expression. A second event downstream of AKT phosphorylation is activation of the canonical NF-κB pathway, which induces IL-6 expression. In addition to these downstream pathways, we unexpectedly found that CD80/CD86-induced PI3K signaling is regulated by previously unrecognized cross-talk with NOTCH1 signaling. This cross-talk is facilitated by NOTCH-mediated up-regulation of the expression of prolyl isomerase PIN1, which in turn increases enzyme activity of casein kinase II. Subsequently, phosphatase and tensin homolog (which suppresses PI3K activity) is inactivated via phosphorylation by casein kinase II. This results in full activation of PI3K signaling upon cross-linking CD80/CD86. Similar to IL-6, we have found that CD80/CD86-induced IDO production by DC at late time points is also dependent upon the PI3K → AKT → NF-κB pathway and requires cross-talk with NOTCH signaling. These data further suggest that the same signaling pathways downstream of DC CD80/CD86 cross-linking induce early IL-6 production to enhance T cell activation, followed by later IDO production to self-limit this activation. In addition to characterizing the pathways downstream of CD80/CD86 in IL-6 and IDO production, identification of a novel cross-talk between NOTCH1 and PI3K signaling may provide new insights in other biological processes where PI3K signaling plays a major role.
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Affiliation(s)
- Chandana Koorella
- From the Department of Immunology, Roswell Park Cancer Institute, Buffalo, New York 14263 and
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14
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Bektas A, Zhang Y, Wood WH, Becker KG, Madara K, Ferrucci L, Sen R. Age-associated alterations in inducible gene transcription in human CD4+ T lymphocytes. Aging (Albany NY) 2013; 5:18-36. [PMID: 23385138 PMCID: PMC3616229 DOI: 10.18632/aging.100522] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Age associated immune dysregulation results in a pro-inflammatory state and increased susceptibility to infections and autoimmune diseases. Studies show that signaling initiated at the T cell antigen receptor (TCR) is impaired in CD4+ T cells from old compared to young mice. Here we examined TCR-inducible gene expression changes in CD4+ T cells during human aging. We reveal a dichotomy in gene expression mediated by the inducible transcription factor NF-κB. Most NF-κB target genes are not induced in a sustained manner in cells derived from older compared to younger individuals. However, a subset of NF-κB target genes including genes associated with chronic pro-inflammatory state in the elderly, such as interleukin 1 and 6, continue to be up-regulated even in the absence of NF-κB induction. In addition, we identify other widespread changes in gene expression between cells derived from older and younger individuals. Surprisingly, many of the most noteworthy age-associated changes in human CD4+ T cells differ from those seen in murine models. Our studies provide the first view of age-associated alteration of TCR-inducible gene expression in human CD4+ T cells.
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Affiliation(s)
- Arsun Bektas
- Laboratory of Molecular Biology and Immunology, National Institutes of Health, Baltimore, MD 21224, USA
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15
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Sun Z, Lei H, Zhang Z. Pre-B cell colony enhancing factor (PBEF), a cytokine with multiple physiological functions. Cytokine Growth Factor Rev 2013; 24:433-42. [PMID: 23787158 DOI: 10.1016/j.cytogfr.2013.05.006] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2012] [Revised: 05/12/2013] [Accepted: 05/21/2013] [Indexed: 02/07/2023]
Abstract
Pre-B cell colony enhancing factor (PBEF) is regarded as a proinflammatory cytokine. Named for its first discovered function as a pre-B cell colony enhancing factor, it has since been found to have many other functions relating to cell metabolism, inflammation, and immune modulation. It has also been found to have intracellular and extracellular forms, with the two overlapping in function. Most of the intracellular functions of PBEF are due to its role as a nicotinamide phosphoribosyltransferase (Nampt). It has been found in human endothelial cells, where it is able to induce angiogenesis through upregulation of VEGF and VEGFR and secretion of MCP-1. In human umbilical endothelial cells, PBEF increases levels of the protease MMP 2/9. PBEF has also been found in a variety of immune cells other than B cells and has been shown to inhibit apoptosis of macrophages. Extracellular PBEF has been shown to increase inflammatory cytokines, such as TNF-α, IL-1β, IL-16, and TGF-β1, and the chemokine receptor CCR3. PBEF also increases the production of IL-6, TNF-α, and IL-1β in CD14(+) monocyctes, macrophages, and dendritic cells, enhances the effectiveness of T cells, and is vital to the development of both B and T lymphocytes. The purpose of this review is to summarize the recent advances in PBEF research.
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Affiliation(s)
- Zhongjie Sun
- Department of Physiology, College of Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA; Department of Cardiology, The First Affiliated Hospital, Chongqing Medical University, Chongqing 400016, China.
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16
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Furman D, Jojic V, Kidd B, Shen-Orr S, Price J, Jarrell J, Tse T, Huang H, Lund P, Maecker HT, Utz PJ, Dekker CL, Koller D, Davis MM. Apoptosis and other immune biomarkers predict influenza vaccine responsiveness. Mol Syst Biol 2013; 9:659. [PMID: 23591775 PMCID: PMC3658270 DOI: 10.1038/msb.2013.15] [Citation(s) in RCA: 145] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2012] [Accepted: 03/07/2013] [Indexed: 12/17/2022] Open
Abstract
Despite the importance of the immune system in many diseases, there are currently no objective benchmarks of immunological health. In an effort to identifying such markers, we used influenza vaccination in 30 young (20-30 years) and 59 older subjects (60 to >89 years) as models for strong and weak immune responses, respectively, and assayed their serological responses to influenza strains as well as a wide variety of other parameters, including gene expression, antibodies to hemagglutinin peptides, serum cytokines, cell subset phenotypes and in vitro cytokine stimulation. Using machine learning, we identified nine variables that predict the antibody response with 84% accuracy. Two of these variables are involved in apoptosis, which positively associated with the response to vaccination and was confirmed to be a contributor to vaccine responsiveness in mice. The identification of these biomarkers provides new insights into what immune features may be most important for immune health.
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Affiliation(s)
- David Furman
- Department of Microbiology and Immunology, School of Medicine, Stanford University, Palo Alto, CA, USA
| | - Vladimir Jojic
- Department of Computer Science, School of Medicine, Stanford University, Palo Alto, CA, USA
| | - Brian Kidd
- Institute for Immunity, Transplantation and Infection, School of Medicine, Stanford University, Palo Alto, CA, USA
| | - Shai Shen-Orr
- Department of Immunology, Faculty of Medicine, Technion, Technion City, Haifa, Israel
| | - Jordan Price
- Department of Microbiology and Immunology, School of Medicine, Stanford University, Palo Alto, CA, USA
| | - Justin Jarrell
- Division of Immunology and Rheumatology, Department of Medicine, School of Medicine, Stanford University, Palo Alto, CA, USA
| | - Tiffany Tse
- Institute for Immunity, Transplantation and Infection, School of Medicine, Stanford University, Palo Alto, CA, USA
| | - Huang Huang
- Department of Microbiology and Immunology, School of Medicine, Stanford University, Palo Alto, CA, USA
| | - Peder Lund
- Department of Microbiology and Immunology, School of Medicine, Stanford University, Palo Alto, CA, USA
| | - Holden T Maecker
- Institute for Immunity, Transplantation and Infection, School of Medicine, Stanford University, Palo Alto, CA, USA
| | - Paul J Utz
- Institute for Immunity, Transplantation and Infection, School of Medicine, Stanford University, Palo Alto, CA, USA
- Division of Immunology and Rheumatology, Department of Medicine, School of Medicine, Stanford University, Palo Alto, CA, USA
| | - Cornelia L Dekker
- Institute for Immunity, Transplantation and Infection, School of Medicine, Stanford University, Palo Alto, CA, USA
- Department of Pediatrics, Division of Infectious Diseases, School of Medicine, Stanford University, Palo Alto, CA, USA
| | - Daphne Koller
- Department of Computer Science, School of Medicine, Stanford University, Palo Alto, CA, USA
| | - Mark M Davis
- Department of Microbiology and Immunology, School of Medicine, Stanford University, Palo Alto, CA, USA
- Institute for Immunity, Transplantation and Infection, School of Medicine, Stanford University, Palo Alto, CA, USA
- The Howard Hughes Medical Institute, Chevy Chase, MD, USA
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17
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D'Acquisto F, Piras G, Rattazzi L. Pro-inflammatory and pathogenic properties of Annexin-A1: the whole is greater than the sum of its parts. Biochem Pharmacol 2013; 85:1213-8. [PMID: 23435354 DOI: 10.1016/j.bcp.2013.02.011] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2012] [Revised: 02/05/2013] [Accepted: 02/05/2013] [Indexed: 01/01/2023]
Abstract
According to Aristotle, "The whole is greater than the sum of its parts" and yet, although a long time has passed still, we seem to struggle to accept this universal concept. Searching in the literature for the biological function of Annexin-A1, one would find a wealth of information on its homeostatic and protective anti-inflammatory effects. However, very little has been said on its emerging role in a wide variety of pathological conditions ranging from cancer to autoimmunity. In this commentary, we will focus our attention on this novel pro-inflammatory and pathogenic "dark side" of Annexin-A1. We will summarize our current understanding of the signaling pathways regulated by this protein and link it to clinical and experimental evidences. Finally we will discuss assets and limitations of Annexin-A1 therapeutic strategies. Most importantly, we hope that this commentary will provide scientific support to "controversial" findings one might encounter while studying this fascinating protein.
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Affiliation(s)
- Fulvio D'Acquisto
- William Harvey Research Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, UK.
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18
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The modulation of PPARγ1 and PPARγ2 mRNA expression by ciglitazone in CD3/CD28-activated naïve and memory CD4+ T cells. Clin Dev Immunol 2012; 2012:849195. [PMID: 22548115 PMCID: PMC3323850 DOI: 10.1155/2012/849195] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2011] [Revised: 01/24/2012] [Accepted: 01/26/2012] [Indexed: 01/10/2023]
Abstract
Given their roles in immune regulation, the expression of the nuclear receptor peroxisome proliferator-activated receptor γ (PPARγ) 1 and 2 isoforms was investigated in human naïve (CD45RA+) and memory (CD45RO+) CD4+ T cells. Stimulation of both types of cells via the CD3/CD28 pathway resulted in high expression of both PPARγ receptors as measured by real-time PCR. Treatment with the PPARγ agonist, ciglitazone, increased PPARγ1 expression but decreased PPARγ2 expression in stimulated naïve and memory cells. Furthermore, when present, the magnitude of both PPARγ receptors expression was lower in naïve cells, perhaps suggesting a lower regulatory control of these cells. Similar profiles of selected proinflammatory cytokines were expressed by the two cell types following stimulation. The induction of PPARγ1 and suppression of PPARγ2 expressions in naïve and memory CD4+ T cells in the presence of ciglitazone suggest that the PPARγ subtypes may have different roles in the regulation of T-cell function.
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19
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Weng NP, Araki Y, Subedi K. The molecular basis of the memory T cell response: differential gene expression and its epigenetic regulation. Nat Rev Immunol 2012; 12:306-15. [PMID: 22421787 DOI: 10.1038/nri3173] [Citation(s) in RCA: 216] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
How the immune system remembers a previous encounter with a pathogen and responds more efficiently to a subsequent encounter has been one of the central enigmas for immunologists for over a century. The identification of pathogen-specific memory lymphocytes that arise after an infection provided a cellular basis for immunological memory. But the molecular mechanisms of immunological memory remain only partially understood. The emerging evidence suggests that epigenetic changes have a key role in controlling the distinct transcriptional profiles of memory lymphocytes and thus in shaping their function. In this Review, we summarize the recent progress that has been made in assessing the differential gene expression and chromatin modifications in memory CD4(+) and CD8(+) T cells, and we present our current understanding of the molecular basis of memory T cell function.
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Affiliation(s)
- Nan-ping Weng
- Laboratory of Molecular Biology and Immunology, National Institute on Aging, National Institutes of Health, Baltimore, Maryland 21224, USA.
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20
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Lyu SY, Park WB. Gene network analysis on the effect of Viscum album var. coloratum in T cells stimulated with anti-CD3/CD28 antibodies. Arch Pharm Res 2011; 34:1735-49. [DOI: 10.1007/s12272-011-1018-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2010] [Revised: 04/27/2011] [Accepted: 06/08/2011] [Indexed: 01/15/2023]
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21
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Fan J, Ishmael FT, Fang X, Myers A, Cheadle C, Huang SK, Atasoy U, Gorospe M, Stellato C. Chemokine transcripts as targets of the RNA-binding protein HuR in human airway epithelium. THE JOURNAL OF IMMUNOLOGY 2011; 186:2482-94. [PMID: 21220697 DOI: 10.4049/jimmunol.0903634] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
HuR is a regulator of mRNA turnover or translation of inflammatory genes through binding to adenylate-uridylate-rich elements and related motifs present in the 3'untranslated region (UTR) of mRNAs. We postulate that HuR critically regulates the epithelial response by associating with multiple ARE-bearing, functionally related inflammatory transcripts. We aimed to identify HuR targets in the human airway epithelial cell line BEAS-2B challenged with TNF-α plus IFN-γ, a strong stimulus for inflammatory epithelial responses. Ribonucleoprotein complexes from resting and cytokine-treated cells were immunoprecipitated using anti-HuR and isotype-control Ab, and eluted mRNAs were reverse-transcribed and hybridized to an inflammatory-focused gene array. The chemokines CCL2, CCL8, CXCL1, and CXCL2 ranked highest among 27 signaling and inflammatory genes significantly enriched in the HuR RNP-IP from stimulated cells over the control immunoprecipitation. Among these, 20 displayed published HuR binding motifs. Association of HuR with the four endogenous chemokine mRNAs was validated by single-gene ribonucleoprotein-immunoprecipitation and shown to be 3'UTR-dependent by biotin pull-down assay. Cytokine treatment increased mRNA stability only for CCL2 and CCL8, and transient silencing and overexpression of HuR affected only CCL2 and CCL8 expression in primary and transformed epithelial cells. Cytokine-induced CCL2 mRNA was predominantly cytoplasmic. Conversely, CXCL1 mRNA remained mostly nuclear and unaffected, as CXCL2, by changes in HuR levels. Increase in cytoplasmic HuR and HuR target expression partially relied on the inhibition of AMP-dependent kinase, a negative regulator of HuR nucleocytoplasmic shuttling. HuR-mediated regulation in airway epithelium appears broader than previously appreciated, coordinating numerous inflammatory genes through multiple posttranscriptional mechanisms.
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Affiliation(s)
- Jinshui Fan
- Division of Allergy and Clinical Immunology, Johns Hopkins University School of Medicine, Baltimore, MD 21224, USA
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22
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Rutishauser RL, Kaech SM. Generating diversity: transcriptional regulation of effector and memory CD8 T-cell differentiation. Immunol Rev 2010; 235:219-33. [PMID: 20536566 DOI: 10.1111/j.0105-2896.2010.00901.x] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
SUMMARY In response to acute infections or vaccines, naive antigen-specific CD8(+) T cells proliferate and differentiate into effector cytotoxic lymphocytes that acquire the ability to kill infected cells. While the majority of differentiated effector cells die after pathogen clearance, a small number evade terminal differentiation, downregulate active effector functions, and survive as long-lived, self-renewing memory T cells. Our understanding of how effector CD8(+) T cells adopt these different cell fates has grown greatly in recent years. In this review, we discuss the transcriptional regulators that are known to support general effector differentiation, terminal effector differentiation, and memory cell formation. We propose that the diversity of activated CD8(+) T-cell differentiation states is achieved via gradients of activity or expression of transcriptional regulators that are regulated by the level of inflammation and antigenic signaling the T cells experience during infection.
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Affiliation(s)
- Rachel L Rutishauser
- Department of Immunobiology, Yale University School of Medicine, New Haven, CT 06520, USA
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23
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Chong BF, Dantzer P, Germeroth T, Hafner M, Wilson AJ, Xiao G, Wong HK. Induced Sézary syndrome PBMCs poorly express immune response genes up-regulated in stimulated memory T cells. J Dermatol Sci 2010; 60:8-20. [PMID: 20801618 DOI: 10.1016/j.jdermsci.2010.07.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2010] [Revised: 07/13/2010] [Accepted: 07/14/2010] [Indexed: 12/21/2022]
Abstract
BACKGROUND Dysfunctions in memory T cells contribute to various inflammatory autoimmune diseases and neoplasms. We hypothesize that investigating the differences of genetic profiles between resting and activated naïve and memory T cells may provide insight into the characterization of abnormal memory T cells in diseases, such as Sézary syndrome (SS), a neoplasm composed of CD4(+) CD45RO(+) cells. OBJECTIVE We determined genes distinctively expressed between resting and activated naive and memory cells. Levels of up-regulated genes in resting and activated memory cells were measured in SS PBMCs, which were largely comprised of CD4(+) CD45RO(+) cells, to quantitatively assess how different Sézary cells were from memory cells. METHODS We compared gene expression profiles using high-density oligo-microarrays between resting and activated naïve and memory CD4(+) T cells. Differentially expressed genes were confirmed by qRT-PCR and immunoblotting. Levels of genes up-regulated in activated and resting memory T cells were determined in SS PBMCs by qRT-PCR. RESULTS Activated memory cells expressed greater numbers of immune-mediated genes involved in effector function compared to naïve cells in our microarray analysis and qRT-PCR. Nine out of 14 genes with enhanced levels in activated memory cells had reduced levels in SS PBMCs (p<0.05). CONCLUSIONS Activation of memory and naïve CD4(+) T cells revealed a diverging gap in gene expression between these subsets, with memory cells expressing immune-related genes important for effector function. Many of these genes were markedly depressed in SS patients, implying Sézary cells are markedly impaired in mounting immune responses compared to memory cells.
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Affiliation(s)
- Benjamin F Chong
- Department of Dermatology, Henry Ford Hospital, Detroit, MI, USA
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24
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Laird RM, Hayes SM. Profiling of the early transcriptional response of murine gammadelta T cells following TCR stimulation. Mol Immunol 2009; 46:2429-38. [PMID: 19439358 DOI: 10.1016/j.molimm.2009.03.029] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2009] [Accepted: 03/28/2009] [Indexed: 10/20/2022]
Abstract
Gammadelta T cells represent one of the three lineages of lymphocytes, along with alphabeta T cells and B cells, which express antigen receptors. Since their discovery over two decades ago, considerable effort has been made to understand their antigen specificity and their contribution to the immune response. From these studies, we have learned that gammadelta T cells recognize a different set of antigens than alphabeta T cells, acquire effector functions faster than alphabeta T cells, regulate the response of other immune cells during infection, and play distinct roles in immunity. The molecular basis for how gammadelta T cells manifest their unique functions, however, remains unknown. To address this, we profiled the genes upregulated soon after TCR stimulation in order to identify which gene networks associated with T cell effector function are induced in gammadelta T cells. Interestingly, most of the genes in this transcriptional profile were not unique to activated gammadelta T cells, as they were also expressed in activated alphabeta T cells. However, many of the genes within this profile were upregulated with faster kinetics and/or greater magnitude in activated gammadelta T cells than in activated alphabeta T cells. In addition, we found that the genes in the transcriptional profile of activated wild-type gammadelta T cells can be used as a standard to screen activated gammadelta T cells from mice with potential signaling defects for alterations in gammadelta TCR signal transduction. Thus, by defining the early transcriptional response of activated wild-type gammadelta T cells and by comparing their transcriptional profile to that of activated wild-type alphabeta T cells as well as to that of activated gammadelta T cells from signaling defective mice, we are able to gain important insights into the molecular basis for gammadelta T cell function.
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Affiliation(s)
- Renee M Laird
- Department of Microbiology and Immunology, SUNY Upstate Medical University, 750 E Adams Street, 2220 Weiskotten Hall, Syracuse, NY 13210, USA
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25
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Yang Y, An J, Weng NP. Telomerase is involved in IL-7-mediated differential survival of naive and memory CD4+ T cells. THE JOURNAL OF IMMUNOLOGY 2008; 180:3775-81. [PMID: 18322183 DOI: 10.4049/jimmunol.180.6.3775] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
IL-7 plays an essential role in T cell maintenance and survival. The survival effect of IL-7 is thought to be mediated through regulation of Bcl2 family proteins. After a comparative analysis of IL-7-induced growth and cell death of human naive and memory CD4(+) T cells, we observed that more memory CD4(+) T cells underwent cell division and proceeded to apoptosis than naive cells in response to IL-7. However, IL-7-induced expressions of Bcl2 family members (Bcl2, Bcl-x(L), Bax, and Bad) were similar between naive and memory cells. Instead, we found that IL-7 induced higher levels of telomerase activity in naive cells than in memory cells, and the levels of IL-7-induced telomerase activity had a significant inverse correlation with cell death in CD4(+) T cells. Furthermore, we showed that reducing expression of telomerase reverse transcriptase and telomerase activity significantly increased cell death of IL-7-cultured CD4(+) T cells. Together, these findings demonstrate that telomerase is involved in IL-7-mediated differential survival of naive and memory CD4(+) T cells.
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Affiliation(s)
- Yinhua Yang
- Laboratory of Immunology, National Institute on Aging, National Institutes of Health, Baltimore, MD 21224, USA
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26
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McKinstry KK, Golech S, Lee WH, Huston G, Weng NP, Swain SL. Rapid default transition of CD4 T cell effectors to functional memory cells. ACTA ACUST UNITED AC 2007; 204:2199-211. [PMID: 17724126 PMCID: PMC2118696 DOI: 10.1084/jem.20070041] [Citation(s) in RCA: 84] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The majority of highly activated CD4 T cell effectors die after antigen clearance, but a small number revert to a resting state, becoming memory cells with unique functional attributes. It is currently unclear when after antigen clearance effectors return to rest and acquire important memory properties. We follow well-defined cohorts of CD4 T cells through the effector-to-memory transition by analyzing phenotype, important functional properties, and gene expression profiles. We find that the transition from effector to memory is rapid in that effectors rested for only 3 d closely resemble canonical memory cells rested for 60 d or longer in the absence of antigen. This is true for both Th1 and Th2 lineages, and occurs whether CD4 T cell effectors rest in vivo or in vitro, suggesting a default pathway. We find that the effector–memory transition at the level of gene expression occurs in two stages: a rapid loss of expression of a myriad of effector-associated genes, and a more gradual gain of expression of a cohort of genes uniquely associated with memory cells rested for extended periods.
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27
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Nueda A, García-Roger N, Domenech T, Godessart N, Cárdenas A, Santamaría-Babi LF, Beleta J. Phosphodiesterase 7A1 is expressed in human CD4+ naïve T cells at higher levels than in CD4+ memory cells and is not required during their CD3/CD28-dependent activation. Cell Immunol 2006; 242:31-8. [PMID: 17034773 DOI: 10.1016/j.cellimm.2006.09.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2006] [Revised: 08/30/2006] [Accepted: 09/01/2006] [Indexed: 10/24/2022]
Abstract
PDE7A1 is a cAMP-hydrolyzing phosphodiesterase expressed in lymphoid tissue, where its possible role during T cell activation remains unclear. We have characterized the functional relevance of PDE7A1 in the naïve (CD4+CD45RA+) and memory (CD4+CD45RO+) subsets of human peripheral CD4+ T cells during CD3/CD28-dependent stimulation. Our results indicate that PDE7A1 is expressed in resting naïve CD4+ T cells at higher levels than in the corresponding memory cells and that levels of PDE7A1 mRNA are not upregulated upon CD3/CD28 mediated stimulation of these T cell subsets. Treatment with a selective inhibitor of PDE7A1 does not impair CD3/CD28 induced activation of naïve or memory CD4+ T cells, nor does it increase intracellular cAMP in CD4+ T cells. We conclude that PDE7A1 is not required during CD3/CD28-dependent activation of naïve and memory CD4+ T cells, but cannot rule out other regulatory roles of PDE7A1 during maturation of CD4+ T cells.
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Affiliation(s)
- Arsenio Nueda
- Departmento de Biología, Centro Investigación Sant Feliu Ll., Almirall, S.A., Ctra. Laureà Miró, 408-410, 08980 Sant Feliu de Llobregat, Barcelona, Spain.
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28
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Fann M, Godlove JM, Catalfamo M, Wood WH, Chrest FJ, Chun N, Granger L, Wersto R, Madara K, Becker K, Henkart PA, Weng NP. Histone acetylation is associated with differential gene expression in the rapid and robust memory CD8(+) T-cell response. Blood 2006; 108:3363-70. [PMID: 16868257 PMCID: PMC1895425 DOI: 10.1182/blood-2006-02-005520] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
To understand the molecular basis for the rapid and robust memory T-cell responses, we examined gene expression and chromatin modification by histone H3 lysine 9 (H3K9) acetylation in resting and activated human naive and memory CD8(+) T cells. We found that, although overall gene expression patterns were similar, a number of genes are differentially expressed in either memory or naive cells in their resting and activated states. To further elucidate the basis for differential gene expression, we assessed the role of histone H3K9 acetylation in differential gene expression. Strikingly, higher H3K9 acetylation levels were detected in resting memory cells, prior to their activation, for those genes that were differentially expressed following activation, indicating that hyperacetylation of histone H3K9 may play a role in selective and rapid gene expression of memory CD8(+) T cells. Consistent with this model, we showed that inducing high levels of H3K9 acetylation resulted in an increased expression in naive cells of those genes that are normally expressed differentially in memory cells. Together, these findings suggest that differential gene expression mediated at least in part by histone H3K9 hyperacetylation may be responsible for the rapid and robust memory CD8(+) T-cell response.
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Affiliation(s)
- Monchou Fann
- Laboratory of Immunology, National Institute on Aging, National Institutes of Health, Baltimore, MD 21224, USA
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29
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Bosco A, McKenna KL, Devitt CJ, Firth MJ, Sly PD, Holt PG. Identification of Novel Th2-Associated Genes in T Memory Responses to Allergens. THE JOURNAL OF IMMUNOLOGY 2006; 176:4766-77. [PMID: 16585570 DOI: 10.4049/jimmunol.176.8.4766] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Atopic diseases are associated with hyperexpression of Th2 cytokines by allergen-specific T memory cells. However, clinical trials with recently developed Th2 inhibitors in atopics have proven disappointing, suggesting underlying complexities in atopy pathogenesis which are not satisfactorily explained via the classical Th1/Th2 paradigm. One likely possibility is that additional Th2-associated genes which are central to disease pathogenesis remain unidentified. The aim of the present study was to identify such novel Th2-associated genes in recall responses to the inhalant allergen house dust mite. In contrast to earlier human microarray studies in atopy which focused on mitogen-activated T cell lines and clones, we concentrated on PBMC-derived primary T cells stimulated under more physiological conditions of low dose allergen exposure. We screened initially for allergen-induced gene activation by microarray, and validated novel genes in independent panels of subjects by quantitative RT-PCR. Kinetic analysis of allergen responses in PBMC revealed an early wave of novel atopy-associated genes involved in signaling which were coexpressed with IL-4 and IL-4R, followed by a later wave of genes encoding the classical Th2 effector cytokines. We further demonstrate that these novel activation-associated Th2 genes up-regulate in response to another atopy-associated physiological stimulus bacterial superantigen, but remain quiescent in nonphysiological responses in primary T cells or cell lines driven by potent mitogens, which may account for their failure to be detected in earlier microarray studies.
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Affiliation(s)
- Anthony Bosco
- Telethon Institute for Child Health Research, and Centre for Child Health Research, Faculty of Medicine and Dentistry, University of Western Australia, Perth, Western Australia
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30
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Abstract
A combination of various post-translational modifications regulates the formation of signaling networks in both the nucleus and the cytosol. Of these, lysine methylation provides a relatively stable marker on histones and contributes to the formation of a distinct pattern of histone-dependent gene regulation ('transcriptional memory'). Thus far, lysine methylation was considered to be nucleus specific; however, recent findings indicate that lysine methylation contributes to receptor-mediated signal transduction in the cytosol.
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Affiliation(s)
- I-hsin Su
- Laboratory of Lymphocyte Signaling, The Rockefeller University, 1230 York Avenue, New York, NY 10021, USA.
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31
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Goda C, Kanaji T, Kanaji S, Tanaka G, Arima K, Ohno S, Izuhara K. Involvement of IL-32 in activation-induced cell death in T cells. Int Immunol 2006; 18:233-40. [PMID: 16410314 DOI: 10.1093/intimm/dxh339] [Citation(s) in RCA: 150] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
NK cell transcript 4 (NK4), now denoted as IL-32, was originally identified as a transcript whose expression was increased in activated NK cells. It has been very recently demonstrated that NK4 is secreted from several cells upon the stimulation of some inflammatory cytokines such as IL-18, IL-1beta, IFN-gamma and IL-12. Furthermore, NK4 induces production of tumor necrosis factor, macrophage inflammatory protein (MIP)-2 and IL-8 in monocytic cell lines, indicating that this factor would be involved in the inflammatory responses. Based on these findings, NK4 was renamed IL-32. However, the biological activities of IL-32 on other cell types remained undetermined. Furthermore, it was still argued whether IL-32 acts on cells from outside or inside the cells. In this article, we first report that expression of IL-32 was up-regulated in activated T cells and NK cells, and that IL-32beta was the predominantly expressed isoform in activated T cells. IL-32 was specifically expressed in T cells undergoing apoptosis and enforced expression of IL-32-induced apoptosis, whereas its down-regulation rescued the cells from apoptosis in HeLa cells. IL-32 existing in the supernatant would be derived from the cytoplasm of apoptotic cells. These results strongly indicated that IL-32 would be involved in activation-induced cell death in T cells, probably via its intracellular actions. Our present findings expand our understanding of the biological function of IL-32 and argue that IL-32 may act on cells, not only from the outside but also from the inside.
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Affiliation(s)
- Chiho Goda
- Division of Medical Biochemistry, Department of Biomolecular Sciences, Saga Medical School, 5-1-1, Nabeshima, Saga, 849-8501, Japan
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32
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Liu F, Lu DP. Purification of placenta-eluted gamma globulins and their strong effect against graft-versus-host reactions in vitro and in vivo. Int J Hematol 2005; 82:162-8. [PMID: 16146851 DOI: 10.1532/ijh97.a10506] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
In the 1980s, attempts were made to use placenta-eluted gamma globulins (PEGG) in patients with graft-versus-host disease (GVHD) after bone marrow transplantation (BMT). Because production of PEGG had been discontinued for many years, we aimed to reestablish a method of production and further explore the mechanisms of the effect of these globulins on GVHD. PEGG were prepared by elution at acid pH from extensively washed human placenta followed by precipitation with saturated ammonium sulfate and absorption on a protein A Sepharose column. In vitro study showed PEGG significantly inhibited both the proliferative response of T-cells to phytohemagglutinin (PHA) and the mixed lymphocyte reaction (MLR). Results of flow cytometric analysis indicated that PEGG down-regulated the expression of CD25 and CD69 on T-cells stimulated by PHA. Cytokine quantification in MLR supernatant showed that PEGG decreased secretion of interferon 3 (IFN-3) but increased production of interleukin 4. In a murine GVHD model, we investigated the preventive effect of PEGG on lethal GVHD in irradiated recipients of allogeneic bone marrow cells and spleen cell transplants by in vivo administration. Compared with controls, recipients treated with PEGG had a markedly increased survival rate with less histopathological evidence of GVHD. These results suggest that PEGG may be a potent therapeutic agent for GVHD.
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Affiliation(s)
- Fang Liu
- Peking University Institute of Hematology, Peking University People's Hospital, Beijing, People's Republic of China
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33
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Mello-Coelho VD, Hess KL. A conceptual and practical overview of cDNA microarray technology: implications for basic and clinical sciences. Braz J Med Biol Res 2005; 38:1543-52. [PMID: 16172747 DOI: 10.1590/s0100-879x2005001000011] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
cDNA microarray is an innovative technology that facilitates the analysis of the expression of thousands of genes simultaneously. The utilization of this methodology, which is rapidly evolving, requires a combination of expertise from the biological, mathematical and statistical sciences. In this review, we attempt to provide an overview of the principles of cDNA microarray technology, the practical concerns of the analytical processing of the data obtained, the correlation of this methodology with other data analysis methods such as immunohistochemistry in tissue microarrays, and the cDNA microarray application in distinct areas of the basic and clinical sciences.
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Affiliation(s)
- V de Mello-Coelho
- Departamento de Histologia e Embriologia, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
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34
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Friedl P, den Boer AT, Gunzer M. Tuning immune responses: diversity and adaptation of the immunological synapse. Nat Rev Immunol 2005; 5:532-45. [PMID: 15999094 DOI: 10.1038/nri1647] [Citation(s) in RCA: 198] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The onset and regulation of a specific immune response results from communication between T cells and antigen-presenting cells (APCs), which form molecular interactions at the site of cell-cell contact--and this is known as the immunological synapse. Initially, the immunological synapse was viewed as a stereotypical adhesion and signalling device with a defined molecular structure and signalling processes. However, as we discuss here, T-cell-APC interactions comprise a diverse range of contact modes and distinct molecular arrangements. These diverse interaction modes might define a molecular code, in which the differences in timing, spacing and molecular composition of the signalling platform determine the outcome of T-cell-APC interactions.
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Affiliation(s)
- Peter Friedl
- Rudolf Virchow Center for Experimental Biomedicine and Department of Dermatology, University of Würzburg, Würzburg 97080, Germany.
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35
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Huang Y, Wernyj RP, Norton DD, Precht P, Seminario MC, Wange RL. Modulation of specific protein expression levels by PTEN: identification of AKAP121, DHFR, G3BP, Rap1, and RCC1 as potential targets of PTEN. Oncogene 2005; 24:3819-29. [PMID: 15782128 DOI: 10.1038/sj.onc.1208527] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The tumor suppressor PTEN is mutated in a high percentage of human cancers, and is implicated in pathways regulating cell growth, proliferation, survival, and migration. Despite significant advances, our understanding of its mechanisms of action remains incomplete. We have used a high-throughput proteomic immunoblotting approach to identify proteins whose expression levels are modulated by PTEN. Out of over 800 proteins screened, 22 proteins showed significant changes in expression. Five proteins that exhibited two-fold or greater changes in expression level were further characterized. AKAP121 and G3BP expression was reduced, while dihydrofolate reductase (DHFR), Rap1 and RCC1 expression was elevated in response to PTEN expression in a PTEN-null T-cell leukemia line. The phosphatase activity of PTEN was required for these effects. However, direct inhibition of PI-3 Kinase could mimic PTEN in modulating expression of DHFR, G3BP, Rap1 and RCC1, but not AKAP121. Real-time PCR showed that the effects of PTEN were primarily post-transcriptional, and would not have been revealed by mRNA-based screens. We conclude from these data that PTEN can modulate the expression level of a number of different proteins. The identified proteins have the potential to serve as previously unrecognized effectors of PTEN, and suggest the existence of additional complexity in the modes by which PTEN can regulate cellular biology.
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Affiliation(s)
- Yanping Huang
- Laboratory of Cellular and Molecular Biology, National Institute on Aging, IRP/NIH/DHHS, 5600 Nathan Shock Drive, MSC-12, Baltimore, MD 21224, USA
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36
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Abstract
Memory T cells exhibit low activation thresholds and mediate rapid effector responses when recalled by antigen; contrasting the higher activation threshold, slower responses and predominant IL-2 production by naive T cells. While the sequence of intracellular events coupling the T cell-receptor (TCR) to naive T cell activation is well characterized, biochemical control of memory T cell differentiation and function remains undefined. In this review, we will discuss recent developments in T cell-receptor signal transduction as they pertain to memory T cells, and will discuss how signal dampening may drive memory generation, and more efficient spatial organization of signaling molecules may promote rapid recall responses.
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Affiliation(s)
- Meena R Chandok
- Division of Transplantation, Department of Surgery, University of Maryland School of Medicine, MSTF Building, Room 400, 685 W. Baltimore St., Baltimore, MD 21201, USA
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37
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Li Y, Zhi W, Wareski P, Weng NP. IL-15 Activates Telomerase and Minimizes Telomere Loss and May Preserve the Replicative Life Span of Memory CD8+T Cells In Vitro. THE JOURNAL OF IMMUNOLOGY 2005; 174:4019-24. [PMID: 15778359 DOI: 10.4049/jimmunol.174.7.4019] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The preservation of the replicative life span of memory CD8(+) T cells is vital for long-term immune protection. Although IL-15 plays a key role in the homeostasis of memory CD8(+) T cells, it is unknown whether IL-15 regulates the replicative life span of memory CD8(+) T cells. In this study, we report an analysis of telomerase expression and telomere length in human memory phenotype CD8(+) T cells maintained by IL-15 in vitro. We demonstrate that IL-15 is capable of activating telomerase in memory CD8(+) T cells via Jak3 and PI3K signaling pathways. Furthermore, IL-15 induces a sustained level of telomerase activity over long periods of time, and in turn minimizes telomere loss in memory CD8(+) T cells after substantial cell divisions. These findings suggest that IL-15 activates stable telomerase expression and compensates telomere loss in memory phenotype CD8(+) T cells, and that telomerase may play an important role in memory CD8(+) T cell homeostasis.
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Affiliation(s)
- Yu Li
- Laboratory of Immunology, National Institute on Aging, National Institutes of Health, Baltimore, MD 21224, USA
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38
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Hess K, Yang Y, Golech S, Sharov A, Becker KG, Weng NP. Kinetic assessment of general gene expression changes during human naive CD4+ T cell activation. Int Immunol 2004; 16:1711-21. [PMID: 15492022 DOI: 10.1093/intimm/dxh172] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The consequence of naive CD4+ T cell activation is the differentiation and generation of effector cells. How the engagement of T cell receptors and co-stimulatory receptors leads to profound differential changes is not fully understood. To assess the transcription changes during T cell activation, we developed human T cell specific cDNA microarray gene filters and examined the gene expression profiles in human naive CD4+ T cells for 10 continuous time points during the first 24 h after anti-CD3 plus anti-CD28 (anti-CD3/CD28) stimulation. We report here a global and kinetic analysis of gene expression changes during naive CD4+ T cell activation and identify 196 genes having expression levels that significantly changed after activation. Based on the temporal change, there are 15 genes that changed between 0-1 h (early), 25 genes between 2-8 h (middle) and 156 genes between 16-24 h (late) after stimulation. Further analyses of the functions of those genes indicate their roles in maintenance of resting status, activation, adhesion/migration, cell cycle progression and cytokine production. However, a significant majority of these genes are novel to T cells and their functions in T cell activation require further study. Together, these results present a kinetic view of the gene expression changes of naive CD4+ T cells in response to T cell receptor-mediated activation for the first time, and provide a basis in understanding how the complex network of gene expression regulation is programmed during CD4+ T cell activation.
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Affiliation(s)
- Krista Hess
- Laboratory of Immunology, National Institutes on Aging, National Institute of Health, Baltimore, MD 21224, USA
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39
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Witkowski JM, Bryl E. Paradoxical age-related cell cycle quickening of human CD4+ lymphocytes: a role for cyclin D1 and calpain. Exp Gerontol 2004; 39:577-85. [PMID: 15050293 DOI: 10.1016/j.exger.2003.10.028] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2003] [Revised: 08/22/2003] [Accepted: 10/07/2003] [Indexed: 10/26/2022]
Abstract
Precise determination of cell cycle length and G(0)-->G(1) transition time of CD4(+) lymphocytes in relation to age was never done before. We show that the cell cycle of healthy elderly donors' CD4(+) cells is significantly shorter, while time to the first division (G(0)-->G(1)) extended compared to cells of young people. The G(0)-->G(1) time inversely correlates with cycle length and the number of CD28 molecules. Quickening of elderly CD4(+) cell divisions depends on overexpression of cyclin D1, possibly related to lowered proteolytic degradation by calpain. Apoptosis eliminates most of responding cells after only one or two divisions, especially in older donors.
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Affiliation(s)
- Jacek M Witkowski
- Department of Pathophysiology, Medical University of Gdansk, Debinki 7, 80-211 Gdansk, Poland.
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40
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Schrum AG, Turka LA, Palmer E. Surface T-cell antigen receptor expression and availability for long-term antigenic signaling. Immunol Rev 2003; 196:7-24. [PMID: 14617194 DOI: 10.1046/j.1600-065x.2003.00083.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
It is important to understand how T-cell antigen receptor (TCR) engagement and signaling are regulated throughout an immune response. This review examines the dynamics of surface TCR expression and signaling capacity during thymic and effector T-cell development. Although the TCR can undergo vast changes in surface expression, T cells remain capable of sustaining TCR engagement for long periods of time. This may be achieved by a combination of mechanisms that involve (a) controlling the quantity of surface TCR available for ligand interaction and (b) controlling the quality of surface TCR expression during T-cell activation. TCR signaling itself appears to be one of the main quantitative modulators of surface TCR expression, and it can cause both downregulation and upregulation at different times of T-cell activation. Recent studies indicate that the degree of upregulation is tunable by the strength of antigenic stimulation. There is evidence that qualitatively distinct forms of the TCR exist, and their potential role in sustained antigenic signaling is also discussed. A goal of future studies will be to better characterize these modulations in surface TCR expression and to clarify their impact on the regulation of immune responses.
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Affiliation(s)
- Adam G Schrum
- Laboratory of Transplantation Immunology and Nephrology, Department of Research, University Hospital-Basel, Hebelstrasse 20, CH-4031 Basel, Switzerland.
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41
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Abstract
Memory immune responses against foreign antigens protect the host from pathogens previously encountered via illness or vaccination, yet can also contribute to the pathology of autoimmune disease when generated against self-antigens. Memory immune responses are classically attributed to the reactivation of long-lived, antigen-specific T lymphocytes that arise directly from differentiated effector T cells and persist in a uniformly quiescent state. Recent findings in both humans and mice, using new biochemical, molecular and cellular approaches, have identified novel features of memory T cells providing new insight into models for memory cell development and differentiation. Biochemical and molecular studies on memory T cells have identified novel markers for memory T cells that may play integral roles in their generation and maintenance. Recent cellular immunological studies have uncovered remarkable heterogeneity amongst antigen-specific memory T cells. Memory cell heterogeneity in the expression of homing and chemokine receptor delineates functional subsets of memory T cells that differ in their proliferative capacity, differentiation potential, homing properties and protective abilities. These findings suggest that memory T cells with diverse properties residing in both lymphoid and nonlymphoid tissues may be necessary to elicit a rapid and effective protective recall immune response involving both cellular and humoral immunity.
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Affiliation(s)
- D L Farber
- Department of Surgery, Division of Transplantation, University of Maryland School of Medicine, MSTF Building, Room 400, 685 W. Baltimore Street, Baltimore, MD 21201, USA.
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42
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Liu K, Abrams SI. Alterations in Fas expression are characteristic of, but not solely responsible for, enhanced metastatic competence. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2003; 170:5973-80. [PMID: 12794124 DOI: 10.4049/jimmunol.170.12.5973] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Dysregulation of the Fas pathway has been implicated in tumor progression; however, how alterations in Fas expression influence metastatic behavior remains unresolved. In this study, we investigated the link between Fas expression and metastatic capacity in two mouse tumor models: one was a sarcoma, which was used to analyze the consequences of loss of Fas function in experimental pulmonary metastases, and the other was a mammary carcinoma, where Fas expression was examined in matched pairs of primary and metastatic cell lines as well as by immunohistochemistry of tissues taken from primary and metastatic sites of spontaneous tumor development. In the sarcoma model, a Fas-resistant/refractory subline was produced in vitro from the parental line by biologic selection against Fas-responsive cells, and it was then compared with the poorly metastatic parental line and to an in vivo-derived subline that was highly metastatic for growth in the lungs. In both tumor models, an inverse correlation was demonstrated between Fas expression and metastatic phenotype. Subsequent studies in the sarcoma model revealed that although the Fas-resistant/refractory subline displayed significant metastatic ability, the parental line from which it was derived exhibited little to no additional metastatic activity if experimentally rendered Fas-resistant by molecular-based strategies or transplanted into a Fas ligand-deficient host. Therefore, these findings suggested that down-regulation of Fas was associated with the metastatic phenotype, but alterations in Fas expression alone were insufficient for acquisition of full metastatic potential. Rather, the ability of such Fas-resistant neoplastic subpopulations to achieve metastatic competence apparently required co-possession of additional malignant characteristics.
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MESH Headings
- Adjuvants, Immunologic/biosynthesis
- Adjuvants, Immunologic/genetics
- Adjuvants, Immunologic/metabolism
- Adjuvants, Immunologic/physiology
- Animals
- Apoptosis/genetics
- Apoptosis/immunology
- Carcinoma/genetics
- Carcinoma/immunology
- Carcinoma/pathology
- Carcinoma/secondary
- Disease Progression
- Fas Ligand Protein
- Female
- Gene Expression Regulation, Neoplastic/immunology
- Ligands
- Lung Neoplasms/genetics
- Lung Neoplasms/immunology
- Lung Neoplasms/pathology
- Lung Neoplasms/secondary
- Mammary Neoplasms, Experimental/genetics
- Mammary Neoplasms, Experimental/immunology
- Mammary Neoplasms, Experimental/pathology
- Membrane Glycoproteins/genetics
- Membrane Glycoproteins/physiology
- Mice
- Mice, Inbred BALB C
- Mice, Inbred C57BL
- Mice, Transgenic
- Neoplasm Transplantation/immunology
- Phenotype
- Sarcoma, Experimental/genetics
- Sarcoma, Experimental/immunology
- Sarcoma, Experimental/pathology
- Sarcoma, Experimental/secondary
- Tumor Cells, Cultured
- fas Receptor/biosynthesis
- fas Receptor/genetics
- fas Receptor/metabolism
- fas Receptor/physiology
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Affiliation(s)
- Kebin Liu
- Laboratory of Tumor Immunology and Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
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43
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Liu K, Abrams SI. Coordinate regulation of IFN consensus sequence-binding protein and caspase-1 in the sensitization of human colon carcinoma cells to Fas-mediated apoptosis by IFN-gamma. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2003; 170:6329-37. [PMID: 12794166 DOI: 10.4049/jimmunol.170.12.6329] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Interferon-gamma is thought to be essential for the regulation of antitumor reactions. However, the degree of responsiveness of malignant cells to IFN-gamma may have a profound influence on the overall efficacy of an antitumor response. In this study, we examined the molecular basis by which IFN-gamma differentially sensitized human primary and metastatic colon carcinoma cells to Fas-mediated apoptosis. To that end, we analyzed IFN-gamma-induced gene expression at the genome scale, followed by an analysis of the expression and function of specific genes associated with IFN-gamma- and Fas-mediated signaling. We found that although both cell populations exhibited a similar gene expression profile at the genome scale in response to IFN-gamma, the expression intensities of the IFN-gamma-regulated genes were much greater in the primary tumor. Noteworthily, two genes, one involved in IFN-gamma-mediated signaling, IFN consensus sequence-binding protein (ICSBP), and one involved in Fas-mediated signaling, caspase-1, were clearly shown to be differentially induced between the two cell lines. In the primary tumor cells, the expression of ICSBP and caspase-1 was strongly induced in response to IFN-gamma, whereas they were weakly to nondetectable in the metastatic tumor cells. Functional studies demonstrated that both caspase-1 and ICSBP were involved in Fas-mediated apoptosis following IFN-gamma sensitization, but proceeded via two distinct pathways. This study also reports for the first time the expression of ICSBP in a nonhemopoietic tumor exhibiting proapoptotic properties. Overall, in a human colon carcinoma cell model, we identified important functional contributions of two IFN-gamma-regulated genes, ICSBP and caspase-1, in the mechanism of Fas-mediated death.
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Affiliation(s)
- Kebin Liu
- Laboratory of Tumor Immunology and Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
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44
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Dixit VD, Sridaran R, Edmonsond MA, Taub D, Thompson WE. Gonadotropin-releasing hormone attenuates pregnancy-associated thymic involution and modulates the expression of antiproliferative gene product prohibitin. Endocrinology 2003; 144:1496-505. [PMID: 12639934 DOI: 10.1210/en.2002-220955] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Thymic involution during pregnancy is believed to be a critical adaptive mechanism for regulation and control of the maternal immune system. These regulatory feedback mechanisms are important for the survival of the semiallogeneic fetus. In the present study, we examined the effects of GnRH on pregnancy-induced thymic involution by characterizing the expression patterns of prohibitin (PHB), an antiproliferative gene product, GnRH, and GnRH receptor (GnRH-R) proteins in the rat thymus and in mature splenic lymphocytes. GnRH agonist infusions in pregnant rats markedly attenuated pregnancy-induced thymic involution resulting in significant increases in thymic weight and thymocyte numbers. In addition, histological examination of the thymus revealed increase in cortical cellularity. Western blot analyses revealed a significant increase of total PHB protein content in thymi during pregnancy. Furthermore, distinct changes in PHB isoform expression were observed in the pregnant involuting thymi with greater expression of the basic PHB isoform. Basic isoform expression decreased in pregnant rats and was comparable with nonpregnant rat thymi upon GnRH agonist treatment. PHB is mainly expressed in mature cells of the thymic medulla, where it strongly colocalized with GnRH. We have observed GnRH-R immunoreactivity mainly in thymic medulla. Furthermore, as assessed by immunofluorescence double labeling with proliferating cell nuclear antigen, PHB was preferentially expressed in nonproliferating thymocytes. In this study, we demonstrated that GnRH, GnRH-R, and PHB show characteristic polarized expression in thymocytes. In addition, GnRH and PHB were coexpressed in mature splenic T cells. Our results suggest that PHB and GnRH are involved in thymic growth and may be important for maturation of T lymphocytes.
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Affiliation(s)
- Vishwa Deep Dixit
- Department of Physiology, National Institute on Aging, National Institutes of Health, Baltimore, Maryland 21224, USA
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45
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Manel N, Kinet S, Battini JL, Kim FJ, Taylor N, Sitbon M. The HTLV receptor is an early T-cell activation marker whose expression requires de novo protein synthesis. Blood 2003; 101:1913-8. [PMID: 12393496 DOI: 10.1182/blood-2002-09-2681] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The human T-cell leukemia virus type 1 (HTLV) is the first isolated human retrovirus, but its receptor has yet to be identified, in part due to its ubiquitous expression. Here we report that quiescent CD4 and CD8 T lymphocytes do not express this receptor, as monitored with a soluble receptor-binding domain derived from the HTLV envelope. However, HTLV receptor is an early activation marker in neonatal and adult T lymphocytes, detected as early as 4 hours following T-cell-receptor (TCR) stimulation. This induced surface expression of the HTLV receptor requires de novo protein synthesis and results in a wide distribution on the surface of activated lymphocytes. Moreover, the distribution of the HTLV receptor is independent of TCR/CD3-capped membrane structures, as observed by confocal immunofluorescence microscopy. To determine whether HTLV receptor up-regulation specifically requires TCR-mediated signals or, alternatively, is dependent on more generalized cell cycle entry/proliferation signals, its expression was monitored in interleukin 7 (IL-7)-stimulated neonatal and adult T cells. Neonatal, but not adult, lymphocytes proliferate in response to IL-7 and HTLV receptor expression is restricted to the former population. Thus, HTLV receptor expression appears to be an early marker of cell cycle entry. Up-regulation of the HTLV receptor, via signals transmitted through the IL-7 cytokine receptor as well as the TCR, is likely to contribute to the mother-to-infant transmission and spreading of HTLV-1.
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MESH Headings
- Adult
- Biomarkers
- Cell Cycle
- Female
- Gene Expression Regulation/drug effects
- Gene Products, env/metabolism
- Genes, env
- HTLV-I Infections/transmission
- Humans
- Infant, Newborn
- Infectious Disease Transmission, Vertical
- Interleukin-7/pharmacology
- Leukemia Virus, Murine/genetics
- Lymphocyte Activation/drug effects
- Maternal-Fetal Exchange
- Microscopy, Confocal
- Microscopy, Fluorescence
- Pregnancy
- Receptor-CD3 Complex, Antigen, T-Cell/immunology
- Receptors, Antigen, T-Cell/immunology
- Receptors, Interleukin-7/physiology
- Receptors, Virus/biosynthesis
- Receptors, Virus/genetics
- Recombinant Fusion Proteins/metabolism
- Signal Transduction
- T-Lymphocyte Subsets/drug effects
- T-Lymphocyte Subsets/immunology
- T-Lymphocyte Subsets/metabolism
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Affiliation(s)
- Nicolas Manel
- Institut de Génétique Moléculaire de Montpellier, CNRS UMR 5535/IFR 24, F-34293 Montpellier Cedex 5, France
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46
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Abstract
How and when memory T cells form during an immune response are long-standing questions. To better understand memory CD8 T cell development, a time course of gene expression and functional changes in antigen-specific T cells during viral infection was evaluated. The expression of many genes continued to change after viral clearance in accordance with changes in CD8 T cell functional properties. Even though memory cell precursors were present at the peak of the immune response, these cells did not display hallmark functional traits of memory T cells. However, these cells gradually acquired the memory cell qualities of self-renewal and rapid recall to antigen suggesting the model that antigen-specific CD8 T cells progressively differentiate into memory cells following viral infection.
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Affiliation(s)
- Susan M Kaech
- Emory Vaccine Center and Department of Microbiology and Immunology, Emory University School of Medicine, 1510 Clifton Road, Atlanta, GA 30322, USA
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47
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Aujame L, Burdin N, Vicari M. How microarrays can improve our understanding of immune responses and vaccine development. Ann N Y Acad Sci 2002; 975:1-23. [PMID: 12538150 DOI: 10.1111/j.1749-6632.2002.tb05937.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Luc Aujame
- Campus Mérieux, 69280 Marcy l'Etoile, France.
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48
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Weng NP, Liu K, Catalfamo M, Li Y, Henkart PA. IL-15 is a growth factor and an activator of CD8 memory T cells. Ann N Y Acad Sci 2002; 975:46-56. [PMID: 12538153 DOI: 10.1111/j.1749-6632.2002.tb05940.x] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Memory lymphocytes, arising from naïve lymphocytes after antigenic stimulation and being long-lived, are the cellular basis for immunological memory. Recent studies of CD8 T cells suggest that generation of CD8 memory T cells requires the engagement of T cell antigen receptors (TCR) with antigen, yet the maintenance of CD8 memory T cells appears to be dependent on cytokines, such as IL-15, independent of TCR. Although considerable progress has been made in understanding the molecular and cellular events of TCR-induced differentiation and proliferation in the past decade, less is known about the mechanisms of IL-15 action. From a kinetic and comparative analysis of the responses of memory phenotype CD8 T cells to IL-15 and TCR stimulation in vitro, we found that IL-15 and anti-CD3 induce highly similar responses in memory phenotype CD8 T cells as measured by general gene expression profiles, synthesis of effector molecules (IFNgamma, TNFbeta, granzyme B and perforin), induction of cytotoxicity, and cellular proliferation. These findings indicate that IL-15 is not only a growth factor but also an antigen-independent activator for CD8 memory T cells.
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Affiliation(s)
- Nan-Ping Weng
- Laboratory of Immunology, National Institute on Aging, National Institutes of Health, Baltimore, Maryland 21224, USA.
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49
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Verdeil G, Puthier D, Nguyen C, Schmitt-Verhulst AM, Auphan-Anezin N. Gene profiling approach to establish the molecular bases for partial versus full activation of naïve CD8 T lymphocytes. Ann N Y Acad Sci 2002; 975:68-76. [PMID: 12538155 DOI: 10.1111/j.1749-6632.2002.tb05942.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
When initial antigen encounter involves optimal antigenic and costimulatory stimuli, naïve CD8 T cells undergo a developmental program that leads to their activation, expansion and acquisition of effector functions (including production of IL-2, IFNgamma and expression of cytolytic effector molecules). A subset of the activated CD8 T cells thrives as long-lived memory cells. Encounter of tissue-associated, and in particular tumor-associated antigen, may often be suboptimal in terms of antigenicity and costimulation, however. We previously developed a model of naïve CD8 T cells from transgenic mice expressing an alloreactive TCR for which a mutant alloantigen behaved as a partial agonist, inducing only some of the effector functions induced by the native alloantigen. To ascertain the molecular bases for the establishment of divergent fates within the same naïve CD8 T cells, we have used cDNA microarrays to monitor sequential gene expression patterns in conditions of full or partial response of these naïve CD8 T cells. Of the 5000 different genes monitored on the array, 18% showed changes in expression in activated versus naïve CD8 T cells, independent of whether stimulation was with full or partial agonist. These included antigen-induced upregulated as well as downregulated genes. Clusters of genes that were differentially expressed were also identified, being either (i) weakly versus strongly, or (ii) transiently versus stably expressed in response to partial and full agonist, respectively. They included (i) genes encoding costimulatory molecules and (ii) genes controlling cytolytic function, cytokine production, and chemokines. Therefore, the cDNA microarray approach was a sensitive tool to provide an exhaustive picture of T cell activation as it could discriminate quantitative, qualitative and dynamic differences in mRNA expression profiles between fully or partially activated T cells.
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Affiliation(s)
- Gréory Verdeil
- Centre d'Immunologie de Marseille-Luminy, CNRS-INSERM-Univ. de la Méditerranée, Marseille-Luminy, France
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50
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Zhang X, Chen Z, Huang H, Gordon JR, Xiang J. DNA microarray analysis of the gene expression profiles of naïve versus activated tumor-specific T cells. Life Sci 2002; 71:3005-17. [PMID: 12384184 DOI: 10.1016/s0024-3205(02)02164-1] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
T cells are a key element in effective cancer immunity, recognizing MHC-antigen peptide complexes on the surface of antigen presenting cells and translating these signals into cytotoxic effector T cell responses. In this study, we systematically investigated by DNA array analysis the expression profiles of 514 immunologically relevant genes in naïve and SP2/0 tumor-specific activated mouse T cell populations. Our data shows that naïve T cells expressed 37 (i.e., 7.6% of the 514) transcripts with expression level (EL) values of > or =2.0, while the activated T cells expressed 101 such transcripts. The expression levels of 9 (1.75% of 514) of the shared transcripts were equivalent in the two populations of T cells. Ninety-six genes were differently expressed upon T cell activation, with 71 (13.81%) being up-regulated and 25 (4.86%) down-regulated. The list of significantly affected genes includes numerous cytokines and their receptors (e.g., IL-2Ralpha, IL-6Ralpha, IL-7Ralpha, IL-16, IL-17R, TGF-beta), chemokines and chemokine receptors (e.g., RANTES, CCR7, CXCR4), alternate surface proteins (e.g., 4-1BB, GITR, integrins-alphaL and -beta7, L-selectin, CD6, CD45 and EMMPRIN), cytoplasmic signaling intermediates (e,g., GATA-3, 14-3-3-eta, CIS1, SMAD4 and JAK1) and an array of other molecules (e.g., NFkappa-B inducing kinase, LTBP3 and persephin), several of which are associated with Th1 responses, and T cell self-regulation or migration. Taken together, our data contribute to our understanding of the generalized processes that accompany T cell activation and, more specifically, to our understanding of the processes associated with T cell activation during antitumor responses.
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Affiliation(s)
- Xueshu Zhang
- Department of Oncology, Research Unit, Saskatchewan Cancer Agency, University of Saskatchewan, Saskatoon Cancer Center, 20 Campus Drive CM200, Saskatoon, Saskatchewan, Canada S7N 0W0
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