scholarly journals Critical role for Slam/SAP signaling in the thymic developmental programming of IL-17- and IFN-γ-producing γδ T cells

2019 ◽  
Author(s):  
Oliver Dienz ◽  
Victoria L. DeVault ◽  
Shawn C. Musial ◽  
Somen K. Mistri ◽  
Linda Mei ◽  
...  
Keyword(s):  
T Cells ◽  
T Cell ◽  
Signaling Pathway ◽  
Functional Programming ◽  
Γδ T Cells ◽  
T Cell Subsets ◽  
Γδ T Cell ◽  
Thymic Development ◽  
Slam Family ◽  
Ifn Γ

AbstractDuring thymic development, γδ T cells commit to either an IFN-γ- or an IL-17-producing phenotype through mechanisms that remain unclear. Here, we investigated whether the SLAM/SAP signaling pathway played a role in the functional programming of thymic γδ T cells. Characterization of SLAM family receptor expression revealed that thymic γδ T cell subsets were each marked by distinct co-expression profiles of SLAMF1, SLAMF4, and SLAMF6. In the thymus, immature CD24hiVγ1 and Vγ4 γδ T cells were largely contained within a SLAMF1+SLAMF6+double positive (DP) population, while mature CD24lowsubsets were either SLAMF1+or SLAMF6+single positive (SP) cells. In the periphery, SLAMF1 and SLAMF6 expression on Vγ1, Vγ4, and Vγ6 T cells distinguished IL-17- and IFN-γ-producing subsets, respectively. Disruption of SLAM family receptor signaling through deletion of SAP resulted in impaired thymic γδ T cell maturation at the CD24hiSLAMF1+SLAMF6+DP stage that was associated with a decreased frequency of CD44+RORγt+γδ T cells. These defects were in turn associated with impaired γδ T cell IL-17 and IFN-γ production in both the thymus as well as in peripheral tissues. The role for SAP was subset-specific, as Vγ1, Vγ4, Vγ5, but not Vγ6 subsets were SAP-dependent. Together, these data suggest that the SLAM/SAP signaling pathway regulates a critical checkpoint in the functional programming of IL-17 and IFN-γ-producing γδ T cell subsets during thymic development.

scholarly journals β2 Integrins differentially regulate γδ T cell subset thymic development and peripheral maintenance

2020 ◽  
Vol 117 (36) ◽  
pp. 22367-22377
Author(s):  
Claire L. McIntyre ◽  
Leticia Monin ◽  
Jesse C. Rop ◽  
Thomas D. Otto ◽  
Carl S. Goodyear ◽  
...  
Keyword(s):  
T Cells ◽  
T Cell ◽  
Ex Vivo ◽  
Cell Subset ◽  
Γδ T Cells ◽  
T Cell Subsets ◽  
Γδ T Cell ◽  
Thymic Development ◽  
T Cell Subset

The γδ T cells reside predominantly at barrier sites and play essential roles in immune protection against infection and cancer. Despite recent advances in the development of γδ T cell immunotherapy, our understanding of the basic biology of these cells, including how their numbers are regulated in vivo, remains poor. This is particularly true for tissue-resident γδ T cells. We have identified the β2family of integrins as regulators of γδ T cells. β2-integrin–deficient mice displayed a striking increase in numbers of IL-17–producing Vγ6Vδ1+γδ T cells in the lungs, uterus, and circulation. Thymic development of this population was normal. However, single-cell RNA sequencing revealed the enrichment of genes associated with T cell survival and proliferation specifically in β2-integrin–deficient IL-17+cells compared to their wild-type counterparts. Indeed, β2-integrin–deficient Vγ6+cells from the lungs showed reduced apoptosis ex vivo, suggesting that increased survival contributes to the accumulation of these cells in β2-integrin–deficient tissues. Furthermore, our data revealed an unexpected role for β2integrins in promoting the thymic development of the IFNγ-producing CD27+Vγ4+γδ T cell subset. Together, our data reveal that β2integrins are important regulators of γδ T cell homeostasis, inhibiting the survival of IL-17–producing Vγ6Vδ1+cells and promoting the thymic development of the IFNγ-producing Vγ4+subset. Our study introduces unprecedented mechanisms of control for γδ T cell subsets.

scholarly journals CD122-directed interleukin-2 treatment mechanisms in bladder cancer differ from αPD-L1 and include tissue-selective γδ T cell activation

2021 ◽  
Vol 9 (4) ◽  
pp. e002051
Author(s):  
Ryan Michael Reyes ◽  
Yilun Deng ◽  
Deyi Zhang ◽  
Niannian Ji ◽  
Neelam Mukherjee ◽  
...  
Keyword(s):  
Bladder Cancer ◽  
T Cells ◽  
T Cell ◽  
T Cell Activation ◽  
Combination Treatment ◽  
Treatment Efficacy ◽  
Interleukin 2 ◽  
Γδ T Cells ◽  
T Cell Subsets ◽  
Γδ T Cell

BackgroundAnti-programmed death-ligand 1 (αPD-L1) immunotherapy is approved to treat bladder cancer (BC) but is effective in <30% of patients. Interleukin (IL)-2/αIL-2 complexes (IL-2c) that preferentially target IL-2 receptor β (CD122) augment CD8+ antitumor T cells known to improve αPD-L1 efficacy. We hypothesized that the tumor microenvironment, including local immune cells in primary versus metastatic BC, differentially affects immunotherapy responses and that IL-2c effects could differ from, and thus complement αPD-L1.MethodsWe studied mechanisms of IL-2c and αPD-L1 efficacy using PD-L1+ mouse BC cell lines MB49 and MBT-2 in orthotopic (bladder) and metastatic (lung) sites.ResultsIL-2c reduced orthotopic tumor burden and extended survival in MB49 and MBT-2 BC models, similar to αPD-L1. Using antibody-mediated cell depletions and genetically T cell-deficient mice, we unexpectedly found that CD8+ T cells were not necessary for IL-2c efficacy against tumors in bladder, whereas γδ T cells, not reported to contribute to αPD-L1 efficacy, were indispensable for IL-2c efficacy there. αPD-L1 responsiveness in bladder required conventional T cells as expected, but not γδ T cells, altogether defining distinct mechanisms for IL-2c and αPD-L1 efficacy. γδ T cells did not improve IL-2c treatment of subcutaneously challenged BC or orthotopic (peritoneal) ovarian cancer, consistent with tissue-specific and/or tumor-specific γδ T cell contributions to IL-2c efficacy. IL-2c significantly altered bladder intratumoral γδ T cell content, activation status, and specific γδ T cell subsets with antitumor or protumor effector functions. Neither IL-2c nor αPD-L1 alone treated lung metastatic MB49 or MBT-2 BC, but their combination improved survival in both models. Combination treatment efficacy in lungs required CD8+ T cells but not γδ T cells.ConclusionsMechanistic insights into differential IL-2c and αPD-L1 treatment and tissue-dependent effects could help develop rational combination treatment strategies to improve treatment efficacy in distinct cancers. These studies also provide insights into γδ T cell contributions to immunotherapy in bladder and engagement of adaptive immunity by IL-2c plus αPD-L1 to treat refractory lung metastases.

CD56+ human blood dendritic cells effectively promote TH1-type γδ T-cell responses

Blood ◽  
2009 ◽  
Vol 114 (20) ◽  
pp. 4422-4431 ◽  
Author(s):  
Georg Gruenbacher ◽  
Hubert Gander ◽  
Andrea Rahm ◽  
Walter Nussbaumer ◽  
Nikolaus Romani ◽  
...  
Keyword(s):  
T Cells ◽  
Dendritic Cells ◽  
T Cell ◽  
Human Blood ◽  
Γδ T Cells ◽  
Rapid Expansion ◽  
Γδ T Cell ◽  
Hla Dr ◽  
Tnf Α ◽  
Ifn Γ

Abstract CD56+ human dendritic cells (DCs) have recently been shown to differentiate from monocytes in response to GM-CSF and type 1 interferon in vitro. We show here that CD56+ cells freshly isolated from human peripheral blood contain a substantial subset of CD14+CD86+HLA-DR+ cells, which have the appearance of intermediate-sized lymphocytes but spontaneously differentiate into enlarged DC-like cells with substantially increased HLA-DR and CD86 expression or into fully mature CD83+ DCs in response to appropriate cytokines. Stimulation of CD56+ cells containing both DCs and abundant γδ T cells with zoledronate and interleukin-2 (IL-2) resulted in the rapid expansion of γδ T cells as well as in IFN-γ, TNF-α, and IL-1β but not in IL-4, IL-10, or IL-17 production. IFN-γ, TNF-α, and IL-1β production were almost completely abolished by depleting CD14+ cells from the CD56+ subset before stimulation. Likewise, depletion of CD14+ cells dramatically impaired γδ T-cell expansion. IFN-γ production could also be blocked by neutralizing the effects of endogenous IL-1β and TNF-α. Conversely, addition of recombinant IL-1β, TNF-α, or both further enhanced IFN-γ production and strongly up-regulated IL-6 production. Our data indicate that CD56+ DCs from human blood are capable of stimulating CD56+ γδ T cells, which may be harnessed for immunotherapy.

scholarly journals Identification of leptospiral protein antigens recognized by WC1+ γδ T cell subsets as target for development of recombinant vaccines

2021 ◽  
Author(s):  
Aline Teixeira ◽  
Alexandria Gillespie ◽  
Alehegne Yirsaw ◽  
Emily Britton ◽  
Janice Telfer ◽  
...  
Keyword(s):  
Immune Response ◽  
T Cells ◽  
T Cell ◽  
Outer Membrane Proteins ◽  
Γδ T Cells ◽  
T Cell Response ◽  
T Cell Subsets ◽  
Economic Losses ◽  
Γδ T Cell ◽  
Protein Antigens

Pathogenic Leptospira species cause leptospirosis, a neglected zoonotic disease recognized as a global public health problem. It is also the cause of the most common cattle infection that results in major economic losses due to reproductive problems. γδ T cells play a role in the protective immune response in livestock species against Leptospira while human γδ T cells also respond to Leptospira. Thus, activation of γδ T cells has emerged as a potential component for optimization of vaccine strategies. Bovine γδ T cells proliferate and produce IFN-γ in response to vaccination with inactivated leptospires and this response is mediated by a specific subpopulation of the WC1-bearing γδ T cells. WC1 molecules are members of the group B scavenger receptor cysteine rich (SRCR) superfamily and are composed of multiple SRCR domains, of which particular extracellular domains act as ligands for Leptospira. Since WC1 molecules function as both pattern recognition receptors and γδ TCR coreceptors, the WC1 system has been proposed as a novel target to engage γδ T cells. Here, we demonstrate the involvement of leptospiral protein antigens in the activation of WC1+ γδ T cells and identified two leptospiral outer membrane proteins able to interact directly with them. Interestingly, we show that the protein-specific γδ T cell response is composed of WC1.1+ and WC1.2+ subsets, although a greater number of WC1.1+ γδ T cells respond. Identification of protein antigens will enhance our understanding of the role γδ T cells play in the leptospiral immune response and in recombinant vaccine development.

scholarly journals Microbial exposure drives polyclonal expansion of innate γδ T cells immediately after birth

2020 ◽  
Vol 117 (31) ◽  
pp. 18649-18660 ◽  
Author(s):  
Sarina Ravens ◽  
Alina S. Fichtner ◽  
Maike Willers ◽  
Dennis Torkornoo ◽  
Sabine Pirr ◽  
...  
Keyword(s):  
T Cells ◽  
T Cell ◽  
Γδ T Cells ◽  
Sub Saharan Africa ◽  
T Cell Subsets ◽  
Γδ T Cell ◽  
Microbial Exposure ◽  
Sub Saharan ◽  
Next Generation Sequencing Ngs ◽  
Infants And Young Children

Starting at birth, the immune system of newborns and children encounters and is influenced by environmental challenges. It is still not completely understood how γδ T cells emerge and adapt during early life. Studying the composition of T cell receptors (TCRs) using next-generation sequencing (NGS) in neonates, infants, and children can provide valuable insights into the adaptation of T cell subsets. To investigate how neonatal γδ T cell repertoires are shaped by microbial exposure after birth, we monitored the γ-chain (TRG) and δ-chain (TRD) repertoires of peripheral blood T cells in newborns, infants, and young children from Europe and sub-Saharan Africa. We identified a set ofTRGandTRDsequences that were shared by all children from Europe and Africa. These were primarily public clones, characterized by simple rearrangements of Vγ9 and Vδ2 chains with low junctional diversity and usage of non-TRDJ1gene segments, reminiscent of early ontogenetic subsets of γδ T cells. Further profiling revealed that these innate, public Vγ9Vδ2+T cells underwent an immediate TCR-driven polyclonal proliferation within the first 4 wk of life. In contrast, γδ T cells using Vδ1+and Vδ3+TRDrearrangements did not significantly expand after birth. However, different environmental cues may lead to the observed increase of Vδ1+and Vδ3+TRDsequences in the majority of African children. In summary, we show how dynamic γδ TCR repertoires develop directly after birth and present important differences among γδ T cell subsets.

Quantitative and Functional Alterations of the Gamma Delta T-Cell Subset within Follicular Lymphoma Microenvironment.

Blood ◽  
2007 ◽  
Vol 110 (11) ◽  
pp. 2601-2601
Author(s):  
Sophie de Guibert ◽  
Jean-Baptiste Thibert ◽  
Céline Bonnaventure ◽  
Patricia Ame-Thomas ◽  
Céline Pangault ◽  
...  
Keyword(s):  
T Cells ◽  
T Cell ◽  
Follicular Lymphoma ◽  
Peripheral Blood ◽  
Γδ T Cells ◽  
Γδ T Cell ◽  
Ifn Γ ◽  
Nonpeptide Antigens

Abstract T cells carrying a γδ TCR account for less than 5% of CD3pos T cells in healthy individuals but are key effectors of innate immunity through the recognition of some unprocessed nonpeptide antigens of both self and foreign origin. Whereas the Vδ2 subpopulation represents more than 70% of peripheral blood γδ T cells, the Vδ1 subset is mainly located in the mucosal tissue. Increasing evidence suggest that γδ T cells have potent antitumor activity and are implicated in the defense against some haematological and epithelial malignancies. Moreover, Vδ2 T cells constitute an attractive immunotherapy strategy since they could be expanded and activated both in vivo and in vitro using synthetic phosphoantigens and aminobiphosphonates. Such strategies are currently tested in preliminary clinical trials, notably in follicular lymphoma (FL). However, an exhaustive phenotypic and functional characterisation of γδ T cells in this disease, including tumor infiltration, is still lacking. We first explored the composition of FL microenvironment using a multicolour flow cytometry analysis. We observed a significant decrease in the percentage of myeloid (LinnegCD11cposHLADRpos) and plasmacytoid (LinnegCD123posHLADRpos) dendritic cells (P = .0011 and P &lt; .0001, respectively) in FL compared to normal secondary lymphoid organs. In addition, among CD3pos T cells, the proportion of follicular helper T cells (CD4posCXCR5posICOShi) was increased (P = .001) whereas regulatory T-cell (CD4posCD25posfoxp3pos) frequency was not altered. When considering the γδ T-cell compartment, we first highlighted a reduction of the Vδ2 subset in normal tonsils (Vδ2 = 23.48 ± 0.15% of γδ T cells, n = 11) when compared with peripheral blood. Remaining non-δ2 γδT cells were predominantly δ1 T cells. More importantly, infiltrating γδ T cells were significantly decreased in lymph node biopsies from FL patients (mean = 0.48 ± 0.4% of CD3pos T cells; n = 27) when compared both to normal tonsils (mean = 2.49 ± 1.6% of CD3pos T cells; n = 33) (P &lt; .0001) and reactive lymph nodes (mean = 2.64 ± 2.6% of CD3pos T cells; n = 9) (P = .0009). This reduction affected both the Vδ1 and Vδ2 T-cell subsets. The functionality of γδ T cells was then assessed by the measurement of cell expansion and production of IFN-γ upon stimulation with the isopentenyl pyrophosphate (IPP) phosphoantigen. Amplification rate in vitro reached 14.6 ± 4.6 fold in tonsils (n = 10) but only 4.36 ± 1.9 fold in FL samples (n = 7) (P &lt; .002) after 5 days of culture in the presence of IPP + IL-2 + IL-15. When focusing on the δ2 subset, this difference was further increased with a 40-fold amplification in tonsil and a 3-fold amplification in FL samples (P = .0004). Evaluation of IFN-γ production using ELISPOT assay revealed a high heterogeneity among tumor samples since 1 to 40% of δ2 T cells were able to respond to IPP stimulation (n = 7). Preliminary data argued for an association between the quantity and the functionality of γδ T cells in FL tumors. In conclusion, we reported an alteration of γδ T cell frequency and functionality within FL tumor niche. The next purpose will be to correlate these in vitro defects with in vivo clinical responses to immunotherapy strategies targeting γδ T cells.

scholarly journals Human papillomavirus oncoproteins induce a reorganization of epithelial-associated γδ T cells promoting tumor formation

2017 ◽  
Vol 114 (43) ◽  
pp. E9056-E9065 ◽  
Author(s):  
Dorien Van hede ◽  
Barbara Polese ◽  
Chantal Humblet ◽  
Anneke Wilharm ◽  
Virginie Renoux ◽  
...  
Keyword(s):  
T Cells ◽  
Human Papillomavirus ◽  
T Cell ◽  
Γδ T Cells ◽  
Tumor Formation ◽  
T Cell Subsets ◽  
Γδ T Cell ◽  
Cell Subpopulations ◽  
T Cell Subpopulations ◽  
The Impact

It has been shown that γδ T cells protect against the formation of squamous cell carcinoma (SCC) in several models. However, the role of γδ T cells in human papillomavirus (HPV)-associated uterine cervical SCC, the third-leading cause of death by cancer in women, is unknown. Here, we investigated the impact of γδ T cells in a transgenic mouse model of carcinogenesis induced by HPV16 oncoproteins. Surprisingly, γδ T cells promoted the development of HPV16 oncoprotein-induced lesions. HPV16 oncoproteins induced a decrease in epidermal Skint1 expression and the associated antitumor Vγ5+ γδ T cells, which were replaced by γδ T-cell subsets (mainly Vγ6+ γδlowCCR2+CCR6−) actively producing IL-17A. Consistent with a proangiogenic role, γδ T cells promoted the formation of blood vessels in the dermis underlying the HPV-induced lesions. In human cervical biopsies, IL-17A+ γδ T cells could only be observed at the cancer stage (SCC), where HPV oncoproteins are highly expressed, supporting the clinical relevance of our observations in mice. Overall, our results suggest that HPV16 oncoproteins induce a reorganization of the local epithelial-associated γδ T-cell subpopulations, thereby promoting angiogenesis and cancer development.

scholarly journals Genetic models reveal origin, persistence and non-redundant functions of IL-17–producing γδ T cells

2018 ◽  
Vol 215 (12) ◽  
pp. 3006-3018 ◽  
Author(s):  
Inga Sandrock ◽  
Annika Reinhardt ◽  
Sarina Ravens ◽  
Christoph Binz ◽  
Anneke Wilharm ◽  
...  
Keyword(s):  
T Cells ◽  
T Cell ◽  
Diphtheria Toxin ◽  
Γδ T Cells ◽  
Γδ T Cell ◽  
Fetal Thymus ◽  
Effector Cells ◽  
Cell Functions ◽  
Ifn Γ ◽  
Redundant Functions

γδ T cells are highly conserved in jawed vertebrates, suggesting an essential role in the immune system. However, γδ T cell–deficient Tcrd−/− mice display surprisingly mild phenotypes. We hypothesized that the lack of γδ T cells in constitutive Tcrd−/− mice is functionally compensated by other lymphocytes taking over genuine γδ T cell functions. To test this, we generated a knock-in model for diphtheria toxin–mediated conditional γδ T cell depletion. In contrast to IFN-γ–producing γδ T cells, IL-17–producing γδ T cells (Tγδ17 cells) recovered inefficiently after depletion, and their niches were filled by expanding Th17 cells and ILC3s. Complementary genetic fate mapping further demonstrated that Tγδ17 cells are long-lived and persisting lymphocytes. Investigating the function of γδ T cells, conditional depletion but not constitutive deficiency protected from imiquimod-induced psoriasis. Together, we clarify that fetal thymus-derived Tγδ17 cells are nonredundant local effector cells in IL-17–driven skin pathology.

Biology of porcine T lymphocytes

2006 ◽  
Vol 7 (1-2) ◽  
pp. 81-96 ◽  
Author(s):  
Wasin Charerntantanakul ◽  
James A. Roth
Keyword(s):  
T Cells ◽  
T Cell ◽  
T Lymphocytes ◽  
Cell Subset ◽  
Γδ T Cells ◽  
T Cell Responses ◽  
T Cell Subsets ◽  
Γδ T Cell ◽  
T Cell Subset ◽  
Cell Responses

The present review concentrates on the biological aspects of porcine T lymphocytes. Their ontogeny, subpopulations, localization and trafficking, and responses to pathogens are reviewed. The development of porcine T cells begins in the liver during the first trimester of fetal life and continues in the thymus from the second trimester until after birth. Porcine T cells are divided into two lineages, based on their possession of the [@@@]\rmalpha [@@@]β or γδ T-cell receptor. Porcine [@@@]\rmalpha [@@@]β T cells recognize antigens in a major histocompatibility complex (MHC)-restricted manner, whereas the γδ T cells recognize antigens in a MHC non-restricted fashion. The CD4+CD8−and CD4+CD8loT cell subsets of [@@@]\rmalpha [@@@]β T cells recognize antigens presented in MHC class II molecules, while the CD4−CD8+T cell subset recognizes antigens presented in MHC class I molecules. Porcine [@@@]\rmalpha [@@@]β T cells localize mainly in lymphoid tissues, whereas γδ T cells predominate in the blood and intestinal epithelium of pigs. Porcine CD8+[@@@]\rmalpha [@@@]β T cells are a prominent T-cell subset during antiviral responses, while porcine CD4+[@@@]\rmalpha [@@@]β T cell responses predominantly occur in bacterial and parasitic infections. Porcine γδ T cell responses have been reported in only a few infections. Porcine T cell responses are suppressed by some viruses and bacteria. The mechanisms of T cell suppression are not entirely known but reportedly include the killing of T cells, the inhibition of T cell activation and proliferation, the inhibition of antiviral cytokine production, and the induction of immunosuppressive cytokines.

scholarly journals Single-cell analysis reveals the origins and intrahepatic development of liver-resident IFN-γ-producing γδ T cells

2021 ◽  
Vol 18 (4) ◽  
pp. 954-968
Author(s):  
Yuan Hu ◽  
Keke Fang ◽  
Yanan Wang ◽  
Nan Lu ◽  
Haoyu Sun ◽  
...  
Keyword(s):  
T Cells ◽  
T Cell ◽  
Single Cell ◽  
Adoptive Transfer ◽  
Γδ T Cells ◽  
Developmental Trajectory ◽  
Γδ T Cell ◽  
Developmental Pathway ◽  
Hematopoietic Progenitor ◽  
Ifn Γ

Abstractγδ T cells are heterogeneous lymphocytes located in various tissues. However, a systematic and comprehensive understanding of the origins of γδ T cell heterogeneity and the extrathymic developmental pathway associated with liver γδ T cells remain largely unsolved. In this study, we performed single-cell RNA sequencing (scRNA-seq) to comprehensively catalog the heterogeneity of γδ T cells derived from murine liver and thymus samples. We revealed the developmental trajectory of γδ T cells and found that the liver contains γδ T cell precursors (pre-γδ T cells). The developmental potential of hepatic γδ T precursor cells was confirmed through in vitro coculture experiments and in vivo adoptive transfer experiments. The adoptive transfer of hematopoietic progenitor Lin−Sca-1+Mac-1+ (LSM) cells from fetal or adult liver samples to sublethally irradiated recipients resulted in the differentiation of liver LSM cells into pre-γδ T cells and interferon-gamma+ (IFN-γ+) but not interleukin-17a+ (IL-17a+) γδ T cells in the liver. Importantly, thymectomized mouse models showed that IFN-γ-producing γδ T cells could originate from liver LSM cells in a thymus-independent manner. These results suggested that liver hematopoietic progenitor LSM cells were able to differentiate into pre-γδ T cells and functionally mature γδ T cells, which implied that these cells are involved in a distinct developmental pathway independent of thymus-derived γδ T cells.

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