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Burnham RE, Zoine JT, Story JY, Garimalla SN, Gibson G, Rae A, Williams E, Bixby L, Archer D, Doering CB, Spencer HT. Characterization of Donor Variability for γδ T Cell ex vivo Expansion and Development of an Allogeneic γδ T Cell Immunotherapy. Front Med (Lausanne) 2020; 7:588453. [PMID: 33282892 PMCID: PMC7691424 DOI: 10.3389/fmed.2020.588453] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Accepted: 10/12/2020] [Indexed: 12/22/2022] Open
Abstract
Gamma delta (γδ) T cells recently emerged as an attractive candidate for cancer immunotherapy treatments due to their inherent cytotoxicity against both hematological and solid tumors. Moreover, γδ T cells provide a platform for the development of allogeneic cell therapies, as they can recognize antigens independent of MHC recognition and without the requirement for a chimeric antigen receptor. However, γδ T cell adoptive cell therapy depends on ex vivo expansion to manufacture sufficient cell product numbers, which remains challenging and limited by inter-donor variability. In the current study, we characterize the differences in expansion of γδ T cells from various donors that expand (EX) and donors that fail to expand, i.e., non-expanders (NE). Further, we demonstrate that IL-21 can be used to increase the expansion potential of NE. In order to reduce the risk of graft vs. host disease (GVHD) induced by an allogeneic T cell product, αβ T cell depletions must be considered due to the potential for HLA mismatch. Typically, αβ T cell depletions are performed at the end of expansion, prior to infusion. We show that γδ T cell cultures can be successfully αβ depleted on day 6 of expansion, providing a better environment for the γδ T cells to expand, and that the αβ T cell population remains below clinically acceptable standards for T cell-depleted allogeneic stem cell products. Finally, we assess the potential for a mixed donor γδ T cell therapy and characterize the effects of cryopreservation on γδ T cells. Collectively, these studies support the development of an improved allogeneic γδ T cell product and suggest the possibility of using mixed donor γδ T cell immunotherapies.
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Affiliation(s)
- Rebecca E Burnham
- Department of Pediatrics, Aflac Cancer and Blood Disorders Center, Emory University School of Medicine, Atlanta, GA, United States.,Molecular and Systems Pharmacology Program, Graduate Division of Biological and Biomedical Sciences, Emory University School of Medicine, Atlanta, GA, United States
| | - Jaquelyn T Zoine
- Department of Pediatrics, Aflac Cancer and Blood Disorders Center, Emory University School of Medicine, Atlanta, GA, United States.,Cancer Biology Program, Graduate Division of Biological and Biomedical Sciences, Emory University School of Medicine, Atlanta, GA, United States
| | - Jamie Y Story
- Department of Pediatrics, Aflac Cancer and Blood Disorders Center, Emory University School of Medicine, Atlanta, GA, United States.,Molecular and Systems Pharmacology Program, Graduate Division of Biological and Biomedical Sciences, Emory University School of Medicine, Atlanta, GA, United States
| | - Swetha N Garimalla
- School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA, United States
| | - Greg Gibson
- School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA, United States
| | - Aaron Rae
- Department of Pediatrics, Aflac Cancer and Blood Disorders Center, Emory University School of Medicine, Atlanta, GA, United States
| | - Erich Williams
- Department of Pediatrics, Aflac Cancer and Blood Disorders Center, Emory University School of Medicine, Atlanta, GA, United States
| | - Lisa Bixby
- Department of Pediatrics, Aflac Cancer and Blood Disorders Center, Emory University School of Medicine, Atlanta, GA, United States
| | - David Archer
- Department of Pediatrics, Aflac Cancer and Blood Disorders Center, Emory University School of Medicine, Atlanta, GA, United States
| | - Christopher B Doering
- Department of Pediatrics, Aflac Cancer and Blood Disorders Center, Emory University School of Medicine, Atlanta, GA, United States
| | - H Trent Spencer
- Department of Pediatrics, Aflac Cancer and Blood Disorders Center, Emory University School of Medicine, Atlanta, GA, United States
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Comparison of Sheep, Goats, and Calves as Infection Models for Mycobacterium avium subsp. paratuberculosis. Vet Immunol Immunopathol 2020; 225:110060. [PMID: 32413513 DOI: 10.1016/j.vetimm.2020.110060] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2020] [Revised: 04/20/2020] [Accepted: 04/21/2020] [Indexed: 01/03/2023]
Abstract
Animal infection models to study Mycobacterium avium subsp. paratuberculosis (MAP) infection are useful for evaluating the efficacy of vaccines and other therapeutics for the prevention or treatment of infection. The goal of the present study was to compare smaller ruminants, sheep and goats, with calves as infection models. Neonatal sheep, goats, and calves (n = 4) received 109 cfu of a cattle isolate of MAP in milk replacer on days 0, 3 and 6 in a 12-month study and sampled monthly thereafter. Results demonstrated a robust antigen-specific IFN-γ response at 90 days post-inoculation for sheep and goats, with lower responses noted for calves. By 360 days, IFN-γ responses were 50 and 82% higher for calves than for goats and sheep, respectively. Although MAP-specific antibody responses were first observed in sheep at 90 days, calves had higher antibody responses throughout the remainder of the study. Following pass-through shedding on day 7, fecal shedding was fairly negligible across treatments but remained higher for calves throughout the study. Colonization of tissues was variable within treatment group and was higher for calves and sheep for the majority of tissues. Upon antigen stimulation of PBMCs, higher populations of CD4 + T cells cells and lower populations of γδ TCR + and NK cells were observed for goats and calves compared to sheep. Relative gene expression of IL-4, IL-12, and IL-17 in PBMCs was higher in goats, corresponding to lower tissue colonization with MAP. These data suggest that ruminant species are fairly comparable as infection models for MAP, but discrete differences in host responses to MAP infection exist between species.
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Siegers GM, Dutta I, Lai R, Postovit LM. Functional Plasticity of Gamma Delta T Cells and Breast Tumor Targets in Hypoxia. Front Immunol 2018; 9:1367. [PMID: 29963058 PMCID: PMC6013583 DOI: 10.3389/fimmu.2018.01367] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2018] [Accepted: 06/01/2018] [Indexed: 12/20/2022] Open
Abstract
Interactions between immune and tumor cells in the tumor microenvironment (TME) often impact patient outcome, yet remain poorly understood. In addition, the effects of biophysical features such as hypoxia [low oxygen (O2)] on cells within the TME may lead to tumor evasion. Gamma delta T cells (γδTcs) naturally kill transformed cells and are therefore under development as immunotherapy for various cancers. Clinical trials have proven the safety of γδTc immunotherapy and increased circulating γδTc levels correlate with improved patient outcome. Yet, the function of γδTc tumor infiltrating lymphocytes in human breast cancer remains controversial. Breast tumors can be highly hypoxic, thus therapy must be effective under low O2 conditions. We have found increased infiltration of γδTc in areas of hypoxia in a small cohort of breast tumors; considering their inherent plasticity, it is important to understand how hypoxia influences γδTc function. In vitro, the cell density of expanded primary healthy donor blood-derived human γδTc decreased in response to hypoxia (2% O2) compared to normoxia (20% O2). However, the secretion of macrophage inflammatory protein 1α (MIP1α)/MIP1β, regulated on activation, normal T cell expressed and secreted (RANTES), and CD40L by γδTc were increased after 40 h in hypoxia compared to normoxia concomitant with the stabilization of hypoxia inducible factor 1-alpha protein. Mechanistically, we determined that natural killer group 2, member D (NKG2D) on γδTc and the NKG2D ligand MHC class I polypeptide-related sequence A (MICA)/B on MCF-7 and T47D breast cancer cell lines are important for γδTc cytotoxicity, but that MIP1α, RANTES, and CD40L do not play a direct role in cytotoxicity. Hypoxia appeared to enhance the cytotoxicity of γδTc such that exposure for 48 h increased cytotoxicity of γδTc against breast cancer cells that were maintained in normoxia; conversely, breast cancer lines incubated in hypoxia for 48 h prior to the assay were largely resistant to γδTc cytotoxicity. MICA/B surface expression on both MCF-7 and T47D remained unchanged upon exposure to hypoxia; however, ELISAs revealed increased MICA shedding by MCF-7 under hypoxia, potentially explaining resistance to γδTc cytotoxicity. Despite enhanced γδTc cytotoxicity upon pre-incubation in hypoxia, these cells were unable to overcome hypoxia-induced resistance of MCF-7. Thus, such resistance mechanisms employed by breast cancer targets must be overcome to develop more effective γδTc immunotherapies.
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Affiliation(s)
- Gabrielle M Siegers
- Department of Oncology, University of Alberta, Edmonton, AB, Canada.,Department of Anatomy and Cell Biology, Robarts Research Institute, Western University, London, ON, Canada
| | - Indrani Dutta
- Department of Oncology, University of Alberta, Edmonton, AB, Canada
| | - Raymond Lai
- Department of Oncology, University of Alberta, Edmonton, AB, Canada
| | - Lynne-Marie Postovit
- Department of Oncology, University of Alberta, Edmonton, AB, Canada.,Department of Anatomy and Cell Biology, Robarts Research Institute, Western University, London, ON, Canada
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4
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Pauza CD, Poonia B, Li H, Cairo C, Chaudhry S. γδ T Cells in HIV Disease: Past, Present, and Future. Front Immunol 2015; 5:687. [PMID: 25688241 PMCID: PMC4311680 DOI: 10.3389/fimmu.2014.00687] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2014] [Accepted: 12/22/2014] [Indexed: 12/01/2022] Open
Abstract
Human immunodeficiency virus (HIV) type 1 dysregulates γδ T cells as part of an immune evasion mechanism. Nearly three decades of research defined the effects of HIV on γδ T cells and how this impacts disease. With highly effective antiretroviral therapy providing virus suppression and longer survival, we expected a return to normal for γδ T cells. This is not the case. Even in patients with CD4 T cell reconstitution, normal γδ T cell levels and function are not recovered. The durable damage to Vδ2 T cells is paralleled by defects in NK, CD8 T cells, and dendritic cells. Whether these consequences of HIV stem from similar or distinct mechanisms are not known and effective means for recovering the full range of cellular immunity have not been discovered. These unanswered questions receive too little attention in the overall program of efforts to cure HIV this disease. Approved drugs capable of increasing Vδ2 T cell function are being tested in clinical trials for cancer and hold promise for restoring normal function in patients with HIV disease. The impetus for conducting clinical trials will come from understanding the significance of γδ T cells in HIV disease and what might be gained from targeted immunotherapy. This review traces the history and current progress of AIDS-related research on γδ T cells. We emphasize the damage to γδ T cells that persists despite effective virus suppression. These chronic immune deficits may be linked to the comorbidities of AIDS (cancer, cardiovascular disease, metabolic disease, and others) and will hinder efforts to eradicate HIV by cytotoxic T or NK cell killing. Here, we focus on one subset of T cells that may be critical in the pathogenesis of HIV and an attractive target for new immune-based therapies.
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Affiliation(s)
- C David Pauza
- Institute of Human Virology and Department of Medicine, University of Maryland School of Medicine , Baltimore, MD , USA
| | - Bhawna Poonia
- Institute of Human Virology and Department of Medicine, University of Maryland School of Medicine , Baltimore, MD , USA
| | - Haishan Li
- Institute of Human Virology and Department of Medicine, University of Maryland School of Medicine , Baltimore, MD , USA
| | - Cristiana Cairo
- Institute of Human Virology and Department of Medicine, University of Maryland School of Medicine , Baltimore, MD , USA
| | - Suchita Chaudhry
- Institute of Human Virology and Department of Medicine, University of Maryland School of Medicine , Baltimore, MD , USA
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Cairo C, Surendran N, Harris KM, Mazan-Mamczarz K, Sakoda Y, Diaz-Mendez F, Tamada K, Gartenhaus RB, Mann DL, Pauza CD. Vγ2Vδ2 T cell Costimulation Increases NK cell Killing of Monocyte-derived Dendritic Cells. Immunology 2014; 144:422-430. [PMID: 25227493 PMCID: PMC4557679 DOI: 10.1111/imm.12386] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2014] [Revised: 09/09/2014] [Accepted: 09/12/2014] [Indexed: 12/24/2022] Open
Abstract
Interactions between NK and dendritic cells (DC) affect maturation and function of both cell populations, including NK killing of DC (editing) that is important for controlling the quality of immune responses. We also know that antigen-stimulated Vγ2Vδ2 T cells costimulate NK cells via 4-1BB to enhance killing of tumor cell lines but we do not know what regulates 4-1BB expression or whether other NK effector functions including DC killing, might also be influenced by NK:γδ T cell cross talk. Here we show that antigen-stimulated γδ T cells costimulate NK through ICOS:ICOSL and this signal increases NK killing of autologous DC. Effects of NK:γδ T cell co-culture, which could be reproduced with soluble ICOS-Fc fusion protein, included increased CD69 and 4-1BB expression, IFN-γ, TNF-α, MIP-1β, I-309, RANTES and sFasL production, as well as elevated mRNA levels for costimulatory receptors OX40 (TNFRSF4) and GITR (TNFRSF18). Thus, ICOS/ICOSL costimulation of NK by Vγ2Vδ2 T cells had broad effects on NK phenotype and effector functions. The NK γδ T cell cross talk links innate and antigen-specific lymphocyte responses in the control of cytotoxic effector function and dendritic cell killing. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Cristiana Cairo
- Institute of Human Virology, University of Maryland School of MedicineBaltimore, MD, USA
| | - Naveen Surendran
- Institute of Human Virology, University of Maryland School of MedicineBaltimore, MD, USA
| | - Kristina M Harris
- Department of Pathology, University of Maryland School of MedicineBaltimore, MD, USA
| | - Krystyna Mazan-Mamczarz
- School of Medicine Oncology Program, University of Maryland Marlene and Stewart Greenebaum Cancer Center, University of Maryland School of MedicineBaltimore, MD, USA
| | - Yukimi Sakoda
- Department of Otorhinolaryngology- Head and Neck Surgery, University of Maryland School of MedicineBaltimore, MD, USA
| | - Felisa Diaz-Mendez
- Institute of Human Virology, University of Maryland School of MedicineBaltimore, MD, USA
| | - Koji Tamada
- Department of Otorhinolaryngology- Head and Neck Surgery, University of Maryland School of MedicineBaltimore, MD, USA
| | - Ronald B Gartenhaus
- School of Medicine Oncology Program, University of Maryland Marlene and Stewart Greenebaum Cancer Center, University of Maryland School of MedicineBaltimore, MD, USA
| | - Dean L Mann
- Department of Pathology, University of Maryland School of MedicineBaltimore, MD, USA
| | - C David Pauza
- Institute of Human Virology, University of Maryland School of MedicineBaltimore, MD, USA
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Wu YL, Ding YP, Tanaka Y, Shen LW, Wei CH, Minato N, Zhang W. γδ T cells and their potential for immunotherapy. Int J Biol Sci 2014; 10:119-35. [PMID: 24520210 PMCID: PMC3920167 DOI: 10.7150/ijbs.7823] [Citation(s) in RCA: 105] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2013] [Accepted: 12/17/2013] [Indexed: 12/19/2022] Open
Abstract
Vγ9Vδ2 (also termed Vγ2Vδ2) T cells, a major human peripheral blood γδ T cell subset, recognize microbial (E)-4-hydroxy-3-methylbut-2-enyl diphosphate and endogenous isopentenyl diphosphate in a TCR-dependent manner. The recognition does not require specific accessory cells, antigen uptake, antigen processing, or MHC class I, class II, or class Ib expression. This subset of T cells plays important roles in mediating innate immunity against a wide variety of infections and displays potent and broad cytotoxic activity against human tumor cells. Because γδT cells express both natural killer receptors such as NKG2D and γδ T cell receptors, they are considered to represent a link between innate and adaptive immunity. In addition, activated γδ T cells express a high level of antigen-presenting cell-related molecules and can present peptide antigens derived from destructed cells to αβ T cells. Utilizing these antimicrobial and anti-tumor properties of γδ T cells, preclinical and clinical trials have been conducted to develop novel immunotherapies for infections and malignancies. Here, we review the immunological properties of γδ T cells including the underlying recognition mechanism of nonpeptitde antigens and summarize the results of γδ T cell-based therapies so far performed. Based on the results of the reported trials, γδ T cells appear to be a promising tool for novel immunotherapies against certain types of diseases.
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Affiliation(s)
- Yan-Ling Wu
- 1. Lab of Molecular Immunology, Zhejiang Provincial Center for Disease Control and Prevention, 630 Xincheng Road, Hangzhou, 310051, China
| | - Yan-Ping Ding
- 1. Lab of Molecular Immunology, Zhejiang Provincial Center for Disease Control and Prevention, 630 Xincheng Road, Hangzhou, 310051, China
- 2. Lab of Chemical Biology and Molecular Drug Design, College of Pharmaceutical Science, Zhejiang University of Technology, 18 Chaowang Road, Hangzhou, 310014, China
| | - Yoshimasa Tanaka
- 3. Center for Innovation in Immunoregulative Technology and Therapeutics, Graduate School of Medicine, Kyoto University, Kyoto, 606-8501, Japan
| | - Li-Wen Shen
- 2. Lab of Chemical Biology and Molecular Drug Design, College of Pharmaceutical Science, Zhejiang University of Technology, 18 Chaowang Road, Hangzhou, 310014, China
| | - Chuan-He Wei
- 2. Lab of Chemical Biology and Molecular Drug Design, College of Pharmaceutical Science, Zhejiang University of Technology, 18 Chaowang Road, Hangzhou, 310014, China
| | - Nagahiro Minato
- 4. Department of Immunology and Cell Biology, Graduate School of Medicine, Kyoto University, Kyoto, 606-8501, Japan
| | - Wen Zhang
- 2. Lab of Chemical Biology and Molecular Drug Design, College of Pharmaceutical Science, Zhejiang University of Technology, 18 Chaowang Road, Hangzhou, 310014, China
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CCL5 Expression in Panniculitic T-Cell Dyscrasias and Its Potential Role in Adipocyte Tropism. Am J Dermatopathol 2013. [DOI: 10.1097/dad.0b013e31826b4b1a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Depletion and dysfunction of Vγ2Vδ2 T cells in HIV disease: mechanisms, impacts and therapeutic implications. Cell Mol Immunol 2012; 10:42-9. [PMID: 23241900 DOI: 10.1038/cmi.2012.50] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Infection with human immunodeficiency virus (HIV) disrupts the balance among γδ T cell subsets, with increasing Vδ1+ cells and substantial depletion of circulating Vδ2+ cells. Depletion is an indirect effect of HIV in CD4-negative Vδ2 cells, but is specific for phosphoantigen-responsive subpopulations identified by the Vγ2-Jγ1.2 (also called Vγ9-JγP) T cell receptor rearrangement. The extent of cell loss and recovery is related closely to clinical status, with highest levels of functional Vδ2 cells present in virus controllers (undetectable viremia in the absence of antiretroviral therapy). We review the mechanisms and clinical consequences for Vδ2 cell depletion in HIV disease. We address the question of whether HIV-mediated Vδ2 cell depletion, despite being an indirect effect of infection, is an important part of the immune evasion strategy for this virus. The important roles for Vδ2 cells, as effectors and immune regulators, identify key mechanisms affected by HIV and show the strong relationships between Vδ2 cell loss and immunodeficiency disease. This field is moving toward immune therapies based on targeting Vδ2 cells and we now have clear goals and expectations to guide interventional clinical trials.
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A rare case of intravascular large T-cell lymphoma with an unusual T helper phenotype. Am J Dermatopathol 2012; 33:e99-102. [PMID: 22024573 DOI: 10.1097/dad.0b013e318221bc25] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Although most cases of intravascular large cell lymphoma exhibit a B-cell phenotype, less than 50 cases in the literature describe a T-cell or natural killer cell phenotype and, of these, the majority are CD3+, CD4-, CD5-, CD30-, CD56+, TIA-1+, and EBER+. We present a case of a rare intravascular large T-cell lymphoma in a 59-year-old man with an unusual CD3+, CD4+, CD5-, CD30+, CD56-, TIA-1-negative and EBER-negative phenotype. This T helper or CD30 phenotype is particularly uncommon. To our knowledge, it has only been described once before and never in the absence of the cytotoxic marker TIA-1. This case exemplifies the particular diagnostic challenges raised by intravascular large cell lymphomas generally and should encourage the use of endothelial immunohistochemical staining in questionable cases. While evaluating skin punch biopsies, it is critical to keep this rare entity on the differential diagnosis along with the relatively more common intravascular large B-cell lymphoma and epithelial malignancies. Additionally, our understanding of intravascular large natural killer/T-cell lymphoma as a heterogeneous phenotypic entity continues to evolve. This case demonstrates that the degree of this phenotypic heterogeneity may be even greater than previously thought.
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Boudová S, Li H, Sajadi MM, Redfield RR, Pauza CD. Impact of persistent HIV replication on CD4 negative Vγ2Vδ2 T cells. J Infect Dis 2012; 205:1448-55. [PMID: 22454465 DOI: 10.1093/infdis/jis217] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND CD4- Vγ2Vδ2 T cells are depleted during human immunodeficiency virus (HIV) infection but can recover to near normal levels in patients who spontaneously control viremia in the absence of therapy. By contrasting Vγ2Vδ2 T-cell numbers, phenotype, and T-cell receptor (TCR) repertoire, we investigate the dynamic tension between active immunity and progressive T-cell destruction during persistent viremia. METHODS Peripheral blood Vγ2Vδ2 T-cell levels and phenotypes were characterized by flow cytometry. Lymphoproliferation assays measured functional responses. Spectratyping characterized damage to the TCR repertoire. RESULTS Levels, responses to antigen and the proportion of T effector memory Vγ2Vδ2 T cells in patients with persistent viremia, were intermediate between patients with natural virus suppression (NVS) and patients receiving antiretroviral therapy. Damage to the TCR γ-2 chain repertoire and depletion of CD56+ Vγ2Vδ2 T cells were more pronounced in viremic patients, compared with antiretroviral therapy recipients and patients with natural virus suppression. CONCLUSIONS Characteristics of Vγ2Vδ2 T cells in viremic patients reflect both active responses (increasing cell numbers, better antigen responses, and higher proportion of effector memory cells) and ongoing damage (repertoire changes and loss of CD56+ cells). Unlike patients who control viremia to undetectable levels, Vγ2Vδ2 T cells are diminished during persistent viremia and may eventually be lost because of progressive destruction of the TCR repertoire.
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Affiliation(s)
- Sarah Boudová
- Institute of Human Virology, University of Maryland School of Medicine, Baltimore, MD 21201, USA
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11
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Dieudé M, Striegl H, Tyznik AJ, Wang J, Behar SM, Piccirillo CA, Levine JS, Zajonc DM, Rauch J. Cardiolipin binds to CD1d and stimulates CD1d-restricted γδ T cells in the normal murine repertoire. THE JOURNAL OF IMMUNOLOGY 2011; 186:4771-81. [PMID: 21389252 DOI: 10.4049/jimmunol.1000921] [Citation(s) in RCA: 95] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Cardiolipin (CL), a major phospholipid in bacterial cell walls, is sequestered from the immune system in mammalian mitochondria and is, therefore, a potential danger signal. Based on growing evidence that phospholipids constitute natural ligands for CD1 and that CD1d-restricted T cells recognize phospholipids, we hypothesized that CD1d binds and presents CL and that T cells in the normal immune repertoire respond to CL in a CD1d-restricted manner. We determined the murine CD1d-CL crystal structure at 2.3 Å resolution and established through additional lipid loading experiments that CL, a tetra-acylated phospholipid, binds to murine CD1d with two alkyl chains buried inside the CD1d binding groove and the remaining two exposed into the solvent. We furthermore demonstrate the functional stimulatory activity of CL, showing that splenic and hepatic γδ T cells from healthy mice proliferate in vitro in response to mammalian or bacterial CL in a dose-dependent and CD1d-restricted manner, rapidly secreting the cytokines IFN-γ and RANTES. Finally, we show that hepatic γδ T cells are activated in vivo by CD1d-bearing dendritic cells that have been pulsed with CL, but not phosphatidylcholine. Together, these findings demonstrate that CD1d is able to bind and present CL to a subset of CL-responsive γδ T cells that exist in the spleen and liver of healthy mice and suggest that these cells could play a role in host responses to bacterial lipids and, potentially, self-CL. We propose that CL-responsive γδ T cells play a role in immune surveillance during infection and tissue injury.
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Affiliation(s)
- Mélanie Dieudé
- Division of Rheumatology, Research Institute of the McGill University Health Centre, McGill University, Montreal, Quebec H3G 1A4, Canada
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12
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Pauza CD, Riedel DJ, Gilliam BL, Redfield RR. Targeting γδ T cells for immunotherapy of HIV disease. Future Virol 2011; 6:73-84. [PMID: 21339853 DOI: 10.2217/fvl.10.78] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Disruption of circulating γδ T-cell populations is an early and common outcome of HIV infection. T-cell receptor (TCR)-γ2δ2 cells (expressing the Vγ2 and Vδ2 chains of the γδ TCR) are depleted, even though they are minimally susceptible to direct HIV infection, and exemplify indirect cell depletion mechanisms that are important in the progression to AIDS. Among individuals with common or normally progressing HIV disease, the loss of TCR-γ2δ2 cells has a broad impact on viral immunity, control of opportunistic pathogens and resistance to malignant disease. Advanced HIV disease can result in complete loss of TCR-γ2δ2 cells that are not recovered even during antiretroviral therapy with complete virus suppression. However, normal levels of TCR-γ2δ2 were observed among natural virus suppressors (low or undetectable virus without antiretroviral therapy) irrespective of their MHC haplotype, consistent with their disease-free status. The pattern of loss and recovery of TCR-γ2δ2 cells revealed their unique features and functional capacities, and encourage the development of immune-based therapies to activate and expand this T-cell subset. New research has identified drugs that might reconstitute the TCR-γ2δ2 population, recover their functional contributions, and improve control of HIV replication and disease. Here, we review research on HIV and TCR-γδ T cells to highlight the consequences of depleting this subset and the unique features of TCR-γδ biology that argue in favor of clinical strategies to reconstitute this T-cell subset in individuals with HIV/AIDS.
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Affiliation(s)
- C David Pauza
- Institute of Human Virology, University of Maryland School of Medicine, Baltimore, MD, USA
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13
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Li H, Pauza CD. Rapamycin increases the yield and effector function of human γδ T cells stimulated in vitro. Cancer Immunol Immunother 2010; 60:361-70. [PMID: 21107834 DOI: 10.1007/s00262-010-0945-7] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2010] [Accepted: 11/05/2010] [Indexed: 11/28/2022]
Abstract
Clinical strategies to exploit Vγ2Vδ2 T cell responses for immunotherapy are confronted with short-term increases in cell levels or activity and the development of anergy that reduces the response to therapy with succeeding treatments. We are exploring strategies to increase the yield and durability of elicited Vγ2Vδ2 T cell responses. One approach focuses on the mammalian target of rapamycin (mTOR), which is important for regulating T cell metabolism and function. In Vγ2Vδ2 T cells, mTOR phosphorylates the S6K1 and eIF4EBP1 signaling intermediates after antigen stimulation. Rapamycin inhibited these phosphorylation events without impacting Akt or Erk activation, even though specific inhibition of Akt or Erk in turn reduced the activation of mTOR. The effects of rapamycin on the T cell receptor signaling pathway lead to increased proliferation of treated and antigen-exposed Vγ2Vδ2 cells. Rapamycin altered the phenotype of antigen-specific Vγ2Vδ2 cells by inducing a population shift from CD62L + CD69- to CD62L-CD69+, higher expression of CD25 or Bcl-2, lower levels of CCR5 and increased resistance to Fas-mediated cellular apoptosis. These changes were consistent with rapamycin promoting cell activation while decreasing the susceptibility to cell death that might occur by CCR5 or Fas signaling. Rapamycin treatment during antigen-stimulation of Vγ2Vδ2 T cells may be a strategy for overcoming current obstacles in tumor immunotherapy.
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Affiliation(s)
- Haishan Li
- Institute of Human Virology, University of Maryland School of Medicine, 725 W. Lombard St. Rm. N546, Baltimore, MD 21201, USA
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Wang H, Fang Z, Morita CT. Vgamma2Vdelta2 T Cell Receptor recognition of prenyl pyrophosphates is dependent on all CDRs. THE JOURNAL OF IMMUNOLOGY 2010; 184:6209-22. [PMID: 20483784 DOI: 10.4049/jimmunol.1000231] [Citation(s) in RCA: 97] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
gammadelta T cells differ from alphabeta T cells in the Ags they recognize and their functions in immunity. Although most alphabeta TCRs recognize peptides presented by MHC class I or II, human gammadelta T cells expressing Vgamma2Vdelta2 TCRs recognize nonpeptide prenyl pyrophosphates. To define the molecular basis for this recognition, the effect of mutations in the TCR CDR was assessed. Mutations in all CDR loops altered recognition and cover a large footprint. Unlike murine gammadelta TCR recognition of the MHC class Ib T22 protein, there was no CDR3delta motif required for recognition because only one residue is required. Instead, the length and sequence of CDR3gamma was key. Although a prenyl pyrophosphate-binding site was defined by Lys109 in Jgamma1.2 and Arg51 in CDR2delta, the area outlined by critical mutations is much larger. These results show that prenyl pyrophosphate recognition is primarily by germline-encoded regions of the gammadelta TCR, allowing a high proportion of Vgamma2Vdelta2 TCRs to respond. This underscores its parallels to innate immune receptors. Our results also provide strong evidence for the existence of an Ag-presenting molecule for prenyl pyrophosphates.
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Affiliation(s)
- Hong Wang
- Division of Rheumatology, Department of Internal Medicine, Interdisciplinary Graduate Program in Immunology, University of Iowa College of Medicine, Iowa City, IA 52242, USA
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15
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Anane LH, Edwards KM, Burns VE, Zanten JJCSVV, Drayson MT, Bosch JA. Phenotypic characterization of gammadelta T cells mobilized in response to acute psychological stress. Brain Behav Immun 2010; 24:608-14. [PMID: 20060888 DOI: 10.1016/j.bbi.2010.01.002] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/03/2009] [Revised: 12/22/2009] [Accepted: 01/05/2010] [Indexed: 10/20/2022] Open
Abstract
Gamma-delta (gammadelta) T lymphocytes are versatile cells that play key roles in bacterial clearance, wound repair, and delayed-type hypersensitivity reactions. Recently we showed that these cells are mobilized into the blood during acute psychological stress. gammadelta T lymphocytes are a heterogeneous population of cells, and the current study aimed to characterize the effects of stress on distinct gammadelta T cell populations. Twenty-nine healthy participants completed a 12min speech task. Blood samples were taken after a resting baseline, during the last two minutes of the task, and after a 15min recovery period. Flow cytometry was used to investigate the response of memory phenotypes (i.e. Naïve, Central memory, Effector Memory, and CD45RA(+) Effector Memory (EMRA)) within the delta1 and delta2 gammadelta T cell populations. Cells were further analysed on expression of adhesion molecules (CD11a, CD62L) and the NK-receptor CD94. Both the delta1 and delta2 subsets were mobilized during stress, and for both subsets, EMRA cells were mobilized to a much greater extent than the other memory phenotypes. Analysis of migration markers revealed that mobilized cells had a predominantly tissue migrating phenotype (CD11a(hi)CD62L(lo/neg)) and expressed high levels of the NK-receptor CD94. The current findings indicate that stress primarily mobilizes gammadelta memory cells that have high cytotoxic capability, tissue homing potential, and the capacity for rapid, innate-like target recognition. This selective mobilization possibly provides protection in contexts when tissue damage and antigen exposure are more likely to occur.
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Affiliation(s)
- Leila H Anane
- School of Sport and Exercise Sciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
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Effects of 15-deoxy-delta12,14-prostaglandin J2 (15d-PGJ2) and rosiglitazone on human gammadelta2 T cells. PLoS One 2009; 4:e7726. [PMID: 19888466 PMCID: PMC2766831 DOI: 10.1371/journal.pone.0007726] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2009] [Accepted: 10/09/2009] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND Thiazolidinediones (TZD) class of drugs, and 15-deoxy-D12,14-prostaglandin J2 (15d-PGJ2) are immune regulators predicted to modulate human autoimmune disease. Their effects on gammadelta T cells, which are involved in animal model and human and animal autoimmune diseases, are unknown. METHODOLOGY/PRINCIPAL FINDINGS We characterized the activity of rosiglitazone (from the TZD class of drugs) and 15d-PGJ2 in human Vdelta2 T cells. We found that 15d-PGJ2 and rosiglitazone had different effects on Vdelta2 T cell functions. Both 15d-PGJ2 and rosiglitazone suppressed Vdelta2 T cell proliferation in response to IPP and IL2. However, only 15d-PGJ2 suppressed functional responses including cytokine production, degranulation and cytotoxicity against tumor cells. The mechanism for 15d-PGJ2 effects on Vdelta2 T cells acts through inhibiting Erk activation. In contrast, rosiglitazone did not affect Erk activation but the IL2 signaling pathway, which accounts for rosiglitazone suppression of IL2-dependent, Vdelta2 T cell proliferation without affecting TCR-dependent functions. Rosiglitazone and 15d-PGJ2 are designed to be peroxisome proliferator-activated receptor gamma (PPARgamma) ligands and PPARgamma was expressed in Vdelta2 T cell. Surprisingly, when PPARgamma levels were lowered by specific siRNA, 15d-PGJ2 and rosiglitazone were still active, suggesting their target of action induces cellular proteins other than PPARgamma. CONCLUSIONS/SIGNIFICANCE The current findings expand our understanding of how the immune system is regulated by rosiglitazone and 15d-PGJ2 and will be important to evaluate these compounds as therapeutic agents in human autoimmune disease.
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Anane LH, Edwards KM, Burns VE, Drayson MT, Riddell NE, van Zanten JJCSV, Wallace GR, Mills PJ, Bosch JA. Mobilization of gammadelta T lymphocytes in response to psychological stress, exercise, and beta-agonist infusion. Brain Behav Immun 2009; 23:823-9. [PMID: 19318122 DOI: 10.1016/j.bbi.2009.03.003] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/15/2008] [Revised: 02/28/2009] [Accepted: 03/14/2009] [Indexed: 12/27/2022] Open
Abstract
The mobilization of cytotoxic lymphocytes, such Natural Killer (NK) cells and CD8(+) T cells, during stress and exercise is well documented in humans. However, humans have another cytotoxic lymphocyte subset that has not been studied in this context: the Gamma Delta (gammadelta) T lymphocyte. These cells play key roles in immune processes including the elimination of bacterial infection, wound repair and delayed-type hypersensitivity reactions. The current study investigated the effects of stress, exercise, and beta-agonist infusion on the mobilization of gammadelta T lymphocytes. Three separate studies compared lymphocytosis in response to an acute speech stress task (n=29), high (85%W(max)) and low (35%W(max)) intensity concentric exercise (n=11), and isoproterenol infusion at 20 and 40 ng/kg/min (n=12). Flow cytometric analysis was used to examine lymphocyte subsets. gammadelta T lymphocytes were mobilized in response to all three tasks in a dose-dependent manner; the extent of mobilization during the speech task correlated with concomitant cardiac activation, and was greater during higher intensity exercise and increased dose of beta-agonist infusion. The mobilization of gammadelta T lymphocytes was greater (in terms of % change from baseline) than that of CD8(+) T lymphocytes and less than NK cells. This study is the first to demonstrate that gammadelta T cells are stress-responsive lymphocytes which are mobilized during psychological stress, exercise, and beta-agonist infusion. The mobilization of these versatile cytotoxic cells may provide protection in the context of situations in which antigen exposure is more likely to occur.
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Affiliation(s)
- Leila H Anane
- School of Sport and Exercise Sciences, University of Birmingham, Edgbaston, Birmingham, UK
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Ferrarini M, Delfanti F, Gianolini M, Rizzi C, Alfano M, Lazzarin A, Biswas P. NF-kappa B modulates sensitivity to apoptosis, proinflammatory and migratory potential in short- versus long-term cultured human gamma delta lymphocytes. THE JOURNAL OF IMMUNOLOGY 2009; 181:5857-64. [PMID: 18941174 DOI: 10.4049/jimmunol.181.9.5857] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Vgamma9 Vdelta2 T lymphocytes are involved in the immune response against hematological malignancies and certain pathogens through the recognition of nonpeptidic Ags expressed by tumors and infected cells. Being equipped with proinflammatory chemokine receptors, they participate to the early phases of inflammation acting as both effector and connector cells between innate and adaptive immunity. We show in this study that after initial TCR triggering short- and long-term cultured gammadelta lymphocytes differ in their susceptibility to activation-induced apoptosis and proinflammatory phenotype. Activation-induced apoptosis was triggered by anti-CD95 mAbs or by the gammadeltaTCR stimuli isopentenyl pyrophosphate and pamidronate, the latter in the presence of monocytes. In particular, short-term cultured cells are resistant to apoptosis and characterized by expression of anti-apoptotic cellular FLIP molecules and partial spontaneous caspase-8 activation. Linked to this behavior, short-term gammadelta cells display constitutive activation of the transcription factor NF-kappaB, which is functionally related to their apoptosis-resistant phenotype. Finally, they spontaneously secreted elevated amounts of the NF-kappaB-regulated chemokines CCL3, CCL4, and CCL5, which likely contributed to down-modulation of the inflammatory CCR5 receptor. Conversely, long-term cultured apoptosis-sensitive gammadelta cells displayed uncleaved caspase-8 and no constitutive NF-kappaB activation; moreover, they secreted CC chemokines only upon TCR triggering coupled to the re-expression of CCR5. The expression of members of the TNF receptor family, including CD30 and TNFRII, also varied according to the time in culture. Altogether our data support a link between resistance to apoptosis and a proinflammatory phenotype in gammadelta T lymphocytes, unraveling the crucial role of NF-kappaB in regulating the switch from resistance to apoptosis susceptibility.
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Affiliation(s)
- Marina Ferrarini
- Laboratory of Tumor Immunology, Department of Oncology, Università Vita-Salute San Raffaele, San Raffaele Scientific Institute, Milan, Italy
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Li H, Luo K, Pauza CD. TNF-alpha is a positive regulatory factor for human Vgamma2 Vdelta2 T cells. THE JOURNAL OF IMMUNOLOGY 2008; 181:7131-7. [PMID: 18981134 DOI: 10.4049/jimmunol.181.10.7131] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Vgamma2 Vdelta2 T cells in human peripheral blood recognize phosphoantigen and play important roles in host defense and immunoregulation. The TCR is required for Vgamma2 Vdelta2 T cell responses to phosphoantigen, but less is known about soluble or cell-associated costimulatory molecules. In this study, we show that human Vgamma2 Vdelta2 T cell responses to phosphoantigen, including activation, proliferation, cytokine production, and tumor cell cytotoxicity, require TNF-alpha binding to its receptor, with a preference for TNFR2. Because stimulated Vgamma2 Vdelta2 cells also produce TNF-alpha, this may be a positive control mechanism to sustain the response. Impaired proliferation in the presence of TNF-alpha or TNFR blocking agents was partially rescued by a TLR2 agonist, Pam(3)Cys. Our studies demonstrate that TNF-alpha plays a critical role in regulating human Vgamma2 Vdelta2 T cell immune responses.
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Affiliation(s)
- Haishan Li
- Institute of Human Virology, University of Maryland School of Medicine, Baltimore, MD 21201, USA
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Li H, Peng H, Ma P, Ruan Y, Su B, Ding X, Xu C, Pauza CD, Shao Y. Association between Vgamma2Vdelta2 T cells and disease progression after infection with closely related strains of HIV in China. Clin Infect Dis 2008; 46:1466-72. [PMID: 18419457 DOI: 10.1086/587107] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
BACKGROUND Human immunodeficiency virus (HIV) infection and disease are accompanied by decreases in the absolute number and function of Vgamma2Vdelta2 T cells, suggesting that this subset of cells may play an important role in controlling disease. We performed a cross-sectional study involving HIV-infected former blood donors and assessed the association between Vgamma2Vdelta2 T cells and markers of disease progression. METHODS Changes in Vgamma2Vdelta2 T cell count and function were compared between HIV-infected individuals and healthy blood donors using the Mann-Whitney U test. The relationships between Vgamma2Vdelta2 T cell count, plasma viral load, and CD4 T cell count were analyzed using the Spearman correlation. RESULTS We found significant positive correlations between CD4 T cell count and both total Vgamma2Vdelta2 T cell count (P<.001) and functional (isopentenyl pyrophosphate-responsive) Vgamma2Vdelta2 T cell count (P<.001). We found significant reverse correlations between viral load and both total Vgamma2Vdelta2 T cell count (P<.05) and functional Vgamma2Vdelta2 T cell count (P<.05). CONCLUSIONS The association of Vgamma2Vdelta2 T cells with disease progression in 146 HIV-infected participants supports the view that intact Vgamma2Vdelta2 T cell populations are important for controlling HIV disease.
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Affiliation(s)
- Haishan Li
- State Key Laboratory for Infectious Disease Control and Prevention, National Center for AIDS/STD Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China
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Hebbeler AM, Cairo C, Cummings JS, Pauza CD. Individual Vgamma2-Jgamma1.2+ T cells respond to both isopentenyl pyrophosphate and Daudi cell stimulation: generating tumor effectors with low molecular weight phosphoantigens. Cancer Immunol Immunother 2006; 56:819-29. [PMID: 17131122 PMCID: PMC2948954 DOI: 10.1007/s00262-006-0235-6] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2006] [Accepted: 10/12/2006] [Indexed: 11/26/2022]
Abstract
Human Vgamma2Vdelta2 T cells exhibit T cell receptor-dependent, MHC-unrestricted recognition of antigen and play important roles in tumor and pathogen immunity. To characterize antigen recognition by the Vgamma2Vdelta2 TCR, we used the combined approach of spectratyping and CDR3 sequence analysis that measures changes in the TCR repertoire before and after stimulation with a phosphoantigen (isopentenyl pyrophosphate) or an irradiated tumor cell line (Daudi B lymphoma). Here we describe common Vgamma2 chains that are substantially involved in the response to both phosphoantigens and tumor cells. The recognition properties of common Vgamma2 chains explains the observation that Vgamma2Vdelta2 T cells expanded by phosphoantigen stimulation specifically recognize and kill some but not all tumor cell lines. Our studies further justify efforts to stimulate tumor immunity by administering low molecular weight phosphoantigens and boosting the frequency and tumor effector functions of circulating Vgamma2Vdelta2 T cells.
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Affiliation(s)
- Andrew M. Hebbeler
- Department of Molecular Microbiology and Immunology, University of Maryland Baltimore, Baltimore Maryland 21201
- Division of Basic Science, Institute of Human Virology, Baltimore, Maryland, 21201
| | - Cristiana Cairo
- Division of Basic Science, Institute of Human Virology, Baltimore, Maryland, 21201
| | - Jean-Saville Cummings
- Department of Molecular Medicine, University of Maryland Baltimore, Baltimore, Maryland 21201
| | - C. David Pauza
- Department of Molecular Microbiology and Immunology, University of Maryland Baltimore, Baltimore Maryland 21201
- Division of Basic Science, Institute of Human Virology, Baltimore, Maryland, 21201
- Department of Molecular Medicine, University of Maryland Baltimore, Baltimore, Maryland 21201
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Deetz CO, Hebbeler AM, Propp NA, Cairo C, Tikhonov I, Pauza CD. Gamma interferon secretion by human Vgamma2Vdelta2 T cells after stimulation with antibody against the T-cell receptor plus the Toll-Like receptor 2 agonist Pam3Cys. Infect Immun 2006; 74:4505-11. [PMID: 16861636 PMCID: PMC1539635 DOI: 10.1128/iai.00088-06] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Circulating Vgamma2Vdelta2 T-cell populations in healthy human beings are poised for rapid responses to bacterial or viral pathogens. We asked whether Vgamma2Vdelta2 T cells use the Toll-like receptor (TLR) family to recognize pathogen-associated molecular pattern molecules and to regulate cell functions. Analysis of expanded Vgamma2Vdelta2 T-cell lines showed the abundant presence of TLR2 mRNA, implying that these receptors are important for cell differentiation or function. However, multiple efforts to detect TLR2 protein on the cell surface or in cytoplasmic compartments gave inconsistent results. Functional assays confirmed that human Vgamma2Vdelta2 T cells could respond to the TLR2 agonist (S)-(2,3-bis(palmitoyloxy)-(2RS)-propyl)-N-palmitoyl-(R)-Cys-(S)-Ser(S)-Lys4-OH trihydrochloride (Pam3Cys), but the response required coincident stimulation through the gammadelta T-cell receptor (TCR). Dually stimulated cells produced higher levels of cytoplasmic or cell-free gamma interferon and showed increased expression of the lysosome-associated membrane protein CD107a on the cell surface. A functional TLR2 that requires coincident TCR stimulation may increase the initial potency of Vgamma2Vdelta2 T-cell responses at the site of infection and promote the rapid development of subsequent acquired antipathogen immunity.
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Affiliation(s)
- Carl O Deetz
- Institute of Human Virology, University of Maryland Biotechnology Institute, 725 West Lombard Street, Baltimore, Maryland 21201, USA
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