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Sharma S, Dasgupta M, Vadaga BS, Kodgire P. Unfolding the symbiosis of AID, chromatin remodelers, and epigenetics-The ACE phenomenon of antibody diversity. Immunol Lett 2024; 269:106909. [PMID: 39128629 DOI: 10.1016/j.imlet.2024.106909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2024] [Revised: 08/01/2024] [Accepted: 08/08/2024] [Indexed: 08/13/2024]
Abstract
Activation-induced cytidine deaminase (AID) is responsible for the initiation of somatic hypermutation (SHM) and class-switch recombination (CSR), which result in antibody affinity maturation and isotype switching, thus producing pathogen-specific antibodies. Chromatin dynamics and accessibility play a significant role in determining AID expression and its targeting. Chromatin remodelers contribute to the accessibility of the chromatin structure, thereby influencing the targeting of AID to Ig genes. Epigenetic modifications, including DNA methylation, histone modifications, and miRNA expression, profoundly impact the regulation of AID and chromatin remodelers targeting Ig genes. Additionally, epigenetic modifications lead to chromatin rearrangement and thereby can change AID expression levels and its preferential targeting to Ig genes. This interplay is symbolized as the ACE phenomenon encapsulates three interconnected aspects: AID, Chromatin remodelers, and Epigenetic modifications. This review emphasizes the importance of understanding the intricate relationship between these aspects to unlock the therapeutic potential of these molecular processes and molecules.
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Affiliation(s)
- Saurav Sharma
- Department of Biosciences and Biomedical Engineering, Indian Institute of Technology, Indore, Simrol, Khandwa Road, Indore, 453552, India
| | - Mallar Dasgupta
- Department of Biosciences and Biomedical Engineering, Indian Institute of Technology, Indore, Simrol, Khandwa Road, Indore, 453552, India
| | - Bindu Sai Vadaga
- Department of Biosciences and Biomedical Engineering, Indian Institute of Technology, Indore, Simrol, Khandwa Road, Indore, 453552, India
| | - Prashant Kodgire
- Department of Biosciences and Biomedical Engineering, Indian Institute of Technology, Indore, Simrol, Khandwa Road, Indore, 453552, India.
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2
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Resop RS, Salvatore B, Kim SJ, Gordon BR, Blom B, Vatakis DN, Uittenbogaart CH. HIV-1 Infection Results in Sphingosine-1-Phosphate Receptor 1 Dysregulation in the Human Thymus. Int J Mol Sci 2023; 24:13865. [PMID: 37762169 PMCID: PMC10531245 DOI: 10.3390/ijms241813865] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Revised: 08/31/2023] [Accepted: 09/04/2023] [Indexed: 09/29/2023] Open
Abstract
Regeneration of functional naïve T lymphocytes following the onset of human immunodeficiency virus (HIV) infection remains a crucial issue for people living with HIV (PLWH), even when adhering to antiretroviral therapy (ART). Thus far, reports on the impact of HIV-1 infection on the entry of thymic precursors and the egress of functional naïve T lymphocytes to and from the thymus are limited. We examined the impact of HIV-1 on Sphingosine-1-phosphate (S1P) signaling, which governs the egress of functional naïve thymocytes from the thymus to the periphery. Using in vitro experiments with primary human thymocytes and in vivo and ex vivo studies with humanized mice, we show that HIV-1 infection results in upregulation of the expression of S1P receptor 1 (S1PR1) in the human thymus. Intriguingly, this upregulation occurs during intrathymic infection (direct infection of the human thymic implant) as well as systemic infection in humanized mice. Moreover, considering the dysregulation of pro- and anti-inflammatory cytokines in infected thymi, the increased expression of S1PR1 in response to in vitro exposure to Interferon-Beta (IFN-β) and Tumor Necrosis Factor-Alpha (TNF-α) indicates that cytokine dysregulation following HIV infection may contribute to upregulation of S1PR1. Finally, an increased presence of CD3hiCD69- (fully mature) as well as CD3hiCD69+ (less mature) T cells in the spleen during HIV infection in humanized mice, combined with earlier expression of S1PR1 during thymocyte development, suggests that upregulation of S1PR1 may translate to increased or accelerated egress from the thymus. The egress of thymocytes that are not functionally mature from the thymus to peripheral blood and lymphoid organs may have implications for the immune function of PLWH.
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Affiliation(s)
- Rachel S. Resop
- Department of Microbiology, Immunology and Molecular Genetics, University of California, Los Angeles, CA 90095, USA; (R.S.R.); (B.S.); (S.J.K.)
- UCLA AIDS Institute and Center for AIDS Research, University of California, Los Angeles, CA 90095, USA;
| | - Bradley Salvatore
- Department of Microbiology, Immunology and Molecular Genetics, University of California, Los Angeles, CA 90095, USA; (R.S.R.); (B.S.); (S.J.K.)
| | - Shawn J. Kim
- Department of Microbiology, Immunology and Molecular Genetics, University of California, Los Angeles, CA 90095, USA; (R.S.R.); (B.S.); (S.J.K.)
| | - Brent R. Gordon
- Department of Microbiology, Immunology and Molecular Genetics, University of California, Los Angeles, CA 90095, USA; (R.S.R.); (B.S.); (S.J.K.)
| | - Bianca Blom
- Amsterdam University Medical Centers, University of Amsterdam, 1105 AZ Amsterdam, The Netherlands;
| | - Dimitrios N. Vatakis
- UCLA AIDS Institute and Center for AIDS Research, University of California, Los Angeles, CA 90095, USA;
- Department of Medicine, Division of Hematology-Oncology, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095, USA
| | - Christel H. Uittenbogaart
- Department of Microbiology, Immunology and Molecular Genetics, University of California, Los Angeles, CA 90095, USA; (R.S.R.); (B.S.); (S.J.K.)
- UCLA AIDS Institute and Center for AIDS Research, University of California, Los Angeles, CA 90095, USA;
- Department of Pediatrics, David Geffen School of Medicine at UCLA, University of California, Los Angeles, CA 90095, USA
- Jonsson Comprehensive Cancer Center, University of California, Los Angeles, CA 90095, USA
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3
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Shahbaz S, Bozorgmehr N, Lu J, Osman M, Sligl W, Tyrrell DL, Elahi S. Analysis of SARS-CoV-2 isolates, namely the Wuhan strain, Delta variant, and Omicron variant, identifies differential immune profiles. Microbiol Spectr 2023; 11:e0125623. [PMID: 37676005 PMCID: PMC10581158 DOI: 10.1128/spectrum.01256-23] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Accepted: 07/13/2023] [Indexed: 09/08/2023] Open
Abstract
There is an urgent need to better understand the impact of different severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variants on immune response and disease dynamics to facilitate better intervention strategies. Here, we show that SARS-CoV-2 variants differentially affect host immune responses. The magnitude and quantity of cytokines and chemokines were comparable in those infected with the Wuhan strain and the Delta variant. However, individuals infected with the Omicron variant had significantly lower levels of these mediators. We also found an elevation of plasma galectins (Gal-3, Gal-8, and Gal-9) in infected individuals, in particular, in those with the original strain. Soluble galectins exert a proinflammatory role in COVID-19 pathogenesis. This was illustrated by their correlation with the plasma levels of sCD14, sCD163, enhanced TNF-α/IL-6 secretion, and increased SARS-CoV-2 infectivity in vitro. Moreover, we observed enhanced CD4+ and CD8+ T cell activation in Wuhan strain-infected individuals. Surprisingly, there was a more pronounced T cell activation in those infected with the Omicron in comparison to the Delta variant. In line with T cell activation status, we observed a more pronounced expansion of T cells expressing different co-inhibitory receptors in patients infected with the Wuhan strain, followed by the Omicron and Delta variants. Individuals infected with the Wuhan strain or the Omicron variant had a similar pattern of plasma soluble immune checkpoints. Our results imply that a milder innate immune response might be beneficial and protective in those infected with the Omicron variant. Our results provide a novel insight into the differential impact of SARS-CoV-2 variants on host immunity. IMPORTANCE There is a need to better understand how different SARS-CoV-2 variants influence the immune system and disease dynamics to facilitate the development of better vaccines and therapies. We compared immune responses in 140 SARS-CoV-2-infected individuals with the Wuhan strain, the Delta variant, or the Omicron variant. All these patients were admitted to the intensive care unit and were SARS-CoV-2 vaccination naïve. We found that SARS-CoV-2 variants differentially affect the host immune response. This was done by measuring soluble biomarkers in their plasma and examining different immune cells. Overall, we found that the magnitude of cytokine storm in individuals infected with the Wuhan strain or the Delta variant was greater than in those infected with the Omicron variant. In light of enhanced cytokine release syndrome in individuals infected with the Wuhan strain or the Delta variant, we believe that a milder innate immune response might be beneficial and protective in those infected with the Omicron variant.
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Affiliation(s)
- Shima Shahbaz
- Division of Foundational Sciences, School of Dentistry, University of Alberta, Edmonton, Alberta, Canada
| | - Najmeh Bozorgmehr
- Division of Foundational Sciences, School of Dentistry, University of Alberta, Edmonton, Alberta, Canada
| | - Julia Lu
- Division of Foundational Sciences, School of Dentistry, University of Alberta, Edmonton, Alberta, Canada
| | - Mohammed Osman
- Division of Rheumatology, Department of Medicine, University of Alberta, Edmonton, Alberta, Canada
| | - Wendy Sligl
- Department of Critical Care Medicine, University of Alberta, Edmonton, Alberta, Canada
- Division of Infectious Diseases, Department of Medicine, University of Alberta, Edmonton, Alberta, Canada
| | - D. Lorne Tyrrell
- Department of Medical Microbiology and Immunology, University of Alberta, Edmonton, Alberta, Canada
- Li Ka Shing Institute of Virology, University of Alberta, Edmonton, Alberta, Canada
| | - Shokrollah Elahi
- Division of Foundational Sciences, School of Dentistry, University of Alberta, Edmonton, Alberta, Canada
- Li Ka Shing Institute of Virology, University of Alberta, Edmonton, Alberta, Canada
- Women and Children Health Research Institute (WCHRI), University of Alberta, Edmonton, Alberta, Canada
- Glycomics Institute of Alberta, University of Alberta, Edmonton, Alberta, Canada
- Alberta Transplant Institute, University of Alberta, Edmonton, Alberta, Canada
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4
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Clinicopathological and Epidemiological Findings in Pet Cats Naturally Infected with Feline Immunodeficiency Virus (FIV) in Australia. Viruses 2022; 14:v14102177. [PMID: 36298731 PMCID: PMC9608632 DOI: 10.3390/v14102177] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Revised: 09/26/2022] [Accepted: 09/28/2022] [Indexed: 11/25/2022] Open
Abstract
Feline immunodeficiency virus (FIV) infection in experimentally infected domestic cats produces characteristic clinical manifestations including hematological changes, neurological disease, neoplasia (most notably lymphoma) and lymphopenia-mediated immunodeficiency predisposing cats to a range of secondary infections. Conflicting reports exist, however, with regard to disease associations and survival time in naturally FIV-infected cats. The purpose of this retrospective case−control study was to investigate the effect of natural FIV infection on hematological, blood biochemical and urinalysis parameters and survival time in three cohorts of pet cats in Australia. Cohorts 1 and 2 were recruited from a large veterinary hospital in Melbourne, Victoria (n = 525 and 282), while a third cohort consisted of cats recruited from around Australia as part of a FIV field vaccine efficacy trial (n = 425). FIV-infected cats in cohorts 1, 2 and 3 were found to have 15/37 (41%), 13/39 (33%) and 2/13 (15%) clinicopathological parameters significantly different to FIV-uninfected cats, respectively. Two changes in FIV-infected cats in cohort 1, hypochromia (low hemoglobin) and hyperglobulinemia, were outside the supplied reference intervals and should serve as diagnostic triggers for FIV testing. Kaplan−Meier survival analysis of cats in cohorts 1 and 2 combined did not find any difference between FIV-infected and FIV-uninfected cats, however a confounding factor was a large euthanasia rate within the first 12 months in both groups. Three significant (p < 0.05) spatial clusters of FIV infection were identified in Melbourne. A possible relationship between FIV infection status and socioeconomic disadvantage was discovered, based on three government indices of socioeconomic status (p < 0.001). Until longitudinal field studies are performed in Australia to further investigate the long-term effects of natural FIV infection, Australian veterinarians should consider FIV to be an important infection of pet cats, and recommend measures to prevent FIV infection.
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5
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T-cell evasion and invasion during HIV-1 infection: The role of HIV-1 Tat protein. Cell Immunol 2022; 377:104554. [DOI: 10.1016/j.cellimm.2022.104554] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Revised: 05/22/2022] [Accepted: 05/23/2022] [Indexed: 12/22/2022]
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6
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Activated-memory T cells influence naïve T cell fate: a noncytotoxic function of human CD8 T cells. Commun Biol 2022; 5:634. [PMID: 35768564 PMCID: PMC9243096 DOI: 10.1038/s42003-022-03596-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Accepted: 06/15/2022] [Indexed: 01/26/2023] Open
Abstract
T cells are endowed with the capacity to sense their environment including other T cells around them. They do so to set their numbers and activation thresholds. This form of regulation has been well-studied within a given T cell population - i.e., within the naïve or memory pool; however, less is known about the cross-talk between T cell subsets. Here, we tested whether memory T cells interact with and influence surrounding naïve T cells. We report that human naïve CD8 T cells (TN) undergo phenotypic and transcriptional changes in the presence of autologous activated-memory CD8 T cells (TMem). Following in vitro co-culture with activated central memory cells (TCM), ~3% of the TN acquired activation/memory canonical markers (CD45RO and CD95) in an MHC-I dependent-fashion. Using scRNA-seq, we also observed that ~3% of the TN acquired an activated/memory signature, while ~84% developed a unique activated transcriptional profile hybrid between naïve and activated memory. Pseudotime trajectory analysis provided further evidence that TN with an activated/memory or hybrid phenotype were derived from TN. Our data reveal a non-cytotoxic function of TMem with potential to activate autologous TN into the activated/memory pool. These findings may have implications for host-protection and autoimmunity that arises after vaccination, infection or transplantation.
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Efficient human-like antibody repertoire and hybridoma production in trans-chromosomic mice carrying megabase-sized human immunoglobulin loci. Nat Commun 2022; 13:1841. [PMID: 35383174 PMCID: PMC8983744 DOI: 10.1038/s41467-022-29421-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Accepted: 03/15/2022] [Indexed: 11/15/2022] Open
Abstract
Trans-chromosomic (Tc) mice carrying mini-chromosomes with megabase-sized human immunoglobulin (Ig) loci have contributed to the development of fully human therapeutic monoclonal antibodies, but mitotic instability of human mini-chromosomes in mice may limit the efficiency of hybridoma production. Here, we establish human antibody-producing Tc mice (TC-mAb mice) that stably maintain a mouse-derived, engineered chromosome containing the entire human Ig heavy and kappa chain loci in a mouse Ig-knockout background. Comprehensive, high-throughput DNA sequencing shows that the human Ig repertoire, including variable gene usage, is well recapitulated in TC-mAb mice. Despite slightly altered B cell development and a delayed immune response, TC-mAb mice have more subsets of antigen-specific plasmablast and plasma cells than wild-type mice, leading to efficient hybridoma production. Our results thus suggest that TC-mAb mice offer a valuable platform for obtaining fully human therapeutic antibodies, and a useful model for elucidating the regulation of human Ig repertoire formation. Trans-chromosomic (Tc) mice have helped the development of therapeutic antibodies, but chromosome instability limits its application. Here the authors develop a new line of Tc mice with full human Ig heavy and kappa loci integrated into the mouse artificial chromosome for stable passage, and confirm efficient generation of B cell responses and specific antibodies.
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8
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Verdu-Bou M, Tapia G, Hernandez-Rodriguez A, Navarro JT. Clinical and Therapeutic Implications of Epstein-Barr Virus in HIV-Related Lymphomas. Cancers (Basel) 2021; 13:5534. [PMID: 34771697 PMCID: PMC8583310 DOI: 10.3390/cancers13215534] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Accepted: 10/29/2021] [Indexed: 12/26/2022] Open
Abstract
The incidence of lymphomas is increased in people living with HIV (PLWH). Aggressive B-cell non-Hodgkin lymphomas (NHLs) are the most common and are considered an AIDS-defining cancer (ADC). Although Hodgkin lymphoma (HL) is not considered an ADC, its incidence is also increased in PLWH. Among all HIV-related lymphomas (HRL), the prevalence of Epstein-Barr virus (EBV) is high. It has been shown that EBV is involved in different lymphomagenic mechanisms mediated by some of its proteins, contributing to the development of different lymphoma subtypes. Additionally, cooperation between both HIV and EBV can lead to the proliferation of aberrant B-cells, thereby being an additional lymphomagenic mechanism in EBV-associated HRL. Despite the close relationship between EBV and HRL, the impact of EBV on clinical aspects has not been extensively studied. These lymphomas are treated with the same therapeutic regimens as the general population in combination with cART. Nevertheless, new therapeutic strategies targeting EBV are promising for these lymphomas. In this article, the different types of HRL are extensively reviewed, focusing on the influence of EBV on the epidemiology, pathogenesis, clinical presentation, and pathological characteristics of each lymphoma subtype. Moreover, novel therapies targeting EBV and future strategies to treat HRL harboring EBV are discussed.
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Affiliation(s)
- Miriam Verdu-Bou
- Lymphoid Neoplasms Group, Josep Carreras Leukaemia Research Institute, Can Ruti Campus, 08916 Badalona, Spain;
| | - Gustavo Tapia
- Department of Pathology, Germans Trias i Pujol Hospital, Universitat Autònoma de Barcelona, 08916 Badalona, Spain;
| | - Agueda Hernandez-Rodriguez
- Department of Microbiology, Germans Trias i Pujol Hospital, Universitat Autònoma de Barcelona, 08916 Badalona, Spain;
| | - Jose-Tomas Navarro
- Lymphoid Neoplasms Group, Josep Carreras Leukaemia Research Institute, Can Ruti Campus, 08916 Badalona, Spain;
- Department of Hematology, Institut Català d’Oncologia-Germans Trias i Pujol Hospital, 08916 Badalona, Spain
- Department of Medicine, Universitat Autònoma de Barcelona, 08916 Badalona, Spain
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9
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Rife Magalis B, Autissier P, Williams KC, Chen X, Browne C, Salemi M. Predator-Prey Dynamics of Intra-Host Simian Immunodeficiency Virus Evolution Within the Untreated Host. Front Immunol 2021; 12:709962. [PMID: 34691023 PMCID: PMC8527182 DOI: 10.3389/fimmu.2021.709962] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2021] [Accepted: 09/21/2021] [Indexed: 01/18/2023] Open
Abstract
The dynamic nature of the SIV population during disease progression in the SIV/macaque model of AIDS and the factors responsible for its behavior have not been documented, largely owing to the lack of sufficient spatial and temporal sampling of both viral and host data from SIV-infected animals. In this study, we detail Bayesian coalescent inference of the changing collective intra-host viral effective population size (Ne ) from various tissues over the course of infection and its relationship with what we demonstrate is a continuously changing immune cell repertoire within the blood. Although the relative contribution of these factors varied among hosts and time points, the adaptive immune response best explained the overall periodic dynamic behavior of the effective virus population. Data exposing the nature of the relationship between the virus and immune cell populations revealed the plausibility of an eco-evolutionary mathematical model, which was able to mimic the large-scale oscillations in Ne through virus escape from relatively few, early immunodominant responses, followed by slower escape from several subdominant and weakened immune populations. The results of this study suggest that SIV diversity within the untreated host is governed by a predator-prey relationship, wherein differing phases of infection are the result of adaptation in response to varying immune responses. Previous investigations into viral population dynamics using sequence data have focused on single estimates of the effective viral population size (Ne ) or point estimates over sparse sampling data to provide insight into the precise impact of immune selection on virus adaptive behavior. Herein, we describe the use of the coalescent phylogenetic frame- work to estimate the relative changes in Ne over time in order to quantify the relationship with empirical data on the dynamic immune composition of the host. This relationship has allowed us to expand on earlier simulations to build a predator-prey model that explains the deterministic behavior of the virus over the course of disease progression. We show that sequential viral adaptation can occur in response to phases of varying immune pressure, providing a broader picture of the viral response throughout the entire course of progression to AIDS.
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Affiliation(s)
- Brittany Rife Magalis
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL, United States.,Emerging Pathogens Institute, University of Florida, Gainesville, FL, United States
| | - Patrick Autissier
- Department of Biology, Boston College, Chestnut Hill, MA, United States
| | | | - Xinguang Chen
- Department of Epidemiology, University of Florida, Gainesville, FL, United States
| | - Cameron Browne
- Department of Mathematics, University of Louisiana at Lafayette, Lafayette, LA, United States
| | - Marco Salemi
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL, United States.,Emerging Pathogens Institute, University of Florida, Gainesville, FL, United States
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10
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T lymphocytes as critical mediators in tissue regeneration, fibrosis, and the foreign body response. Acta Biomater 2021; 133:17-33. [PMID: 33905946 DOI: 10.1016/j.actbio.2021.04.023] [Citation(s) in RCA: 41] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Revised: 03/23/2021] [Accepted: 04/13/2021] [Indexed: 12/16/2022]
Abstract
Research on the foreign body response (FBR) to biomaterial implants has been focused on the roles that the innate immune system has on mediating tolerance or rejection of implants. However, the immune system also involves the adaptive immune response and it must be included in order to form a complete picture of the response to biomaterials and medical implants. In this review, we explore recent understanding about the roles of adaptive immune cells, specifically T cells, in modulating the immune response to biomaterial implants. The immune response to implants elicits a delicate balance between tissue repair and fibrosis that is mainly regulated by three types of T helper cell responses -T helper type 1, T helper type 2, and T helper type 17- and their crosstalk with innate immune cells. Interestingly, many T cell response mechanisms to implants overlap with the process of fibrosis or repair in different tissues. This review explores the fibrotic and regenerative T cell biology and draws parallels to T cell responses to biomaterials. Additionally, we also explore the biomedical engineering advancements in biomaterial applications in designing particle and scaffold systems to modulate T cell activity for therapeutics and devices. Not only do the deliberate engineering design of physical and chemical material properties and the direct genetic modulation of T cells not only offer insights to T cell biology, but they also present different platforms to develop immunomodulatory biomaterials. Thus, an in-depth understanding of T cells' roles can help to navigate the biomaterial-immune interactions and reconsider the long-lasting adaptive immune response to implants, which, in the end, contribute to the design of immunomodulatory medical implants that can advance the next generation of regenerative therapy. STATEMENT OF SIGNIFICANCE: This review article integrates knowledge of adaptive immune responses in tissue damage, wound healing, and medical device implantation. These three fields, often not discussed in conjunction, are important to consider when evaluating and designing biomaterials. Through incorporation of basic biological research alongside engineering research, we provide an important lens through which to evaluate adaptive immune contributions to regenerative medicine and medical device development.
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11
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Bei diesen Patienten sollten Sie an einen HIV-Test denken! HAUTNAH DERMATOLOGIE 2021. [PMCID: PMC8450030 DOI: 10.1007/s15012-021-6721-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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12
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Zhao EJ, Cheng CV, Mattman A, Chen LYC. Polyclonal hypergammaglobulinaemia: assessment, clinical interpretation, and management. LANCET HAEMATOLOGY 2021; 8:e365-e375. [PMID: 33894171 DOI: 10.1016/s2352-3026(21)00056-9] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Revised: 02/18/2021] [Accepted: 02/19/2021] [Indexed: 12/13/2022]
Abstract
This Review outlines a practical approach to assessing and managing polyclonal hypergammaglobulinaemia in adults. Polyclonal hypergammaglobulinaemia is most commonly caused by liver disease, immune dysregulation, or inflammation, but can also provide an important diagnostic clue of rare diseases such as histiocyte disorders, autoimmune lymphoproliferative syndrome, Castleman disease, and IgG4-related disease. Causes of polyclonal hypergammaglobulinaemia can be divided into eight categories: liver disease, autoimmune disease and vasculitis, infection and inflammation, non-haematological malignancy, haematological disorders, IgG4-related disease, immunodeficiency syndromes, and iatrogenic (from immunoglobulin therapy). Measuring serum concentrations of C-reactive protein and IgG subclasses are helpful in diagnosis. IL-6-mediated inflammation, associated with persistently elevated C-reactive protein concentrations (≥30 mg/L), is an important driver of polyclonal hypergammaglobulinaemia in some cases. Although the presence of markedly elevated serum IgG4 concentrations (>5 g/L) is around 90% specific for diagnosing IgG4-related disease, mildly elevated serum IgG4 concentrations are seen in many conditions. In most cases, managing polyclonal hypergammaglobulinaemia simply involves treating the underlying condition. Rarely, however, polyclonal hypergammaglobulinaemia can lead to hyperviscosity, requiring plasmapheresis.
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Affiliation(s)
- Eric J Zhao
- Division of Hematology, University of British Columbia, Vancouver, BC, Canada; Department of Medicine, Vancouver General Hospital, Vancouver, BC, Canada
| | - Catherine V Cheng
- Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, BC, Canada; Department of Medicine, Vancouver General Hospital, Vancouver, BC, Canada
| | - Andre Mattman
- Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, BC, Canada; Department of Medicine, Vancouver General Hospital, Vancouver, BC, Canada; Department of Pathology and Laboratory Medicine, St Paul's Hospital, Vancouver, BC, Canada
| | - Luke Y C Chen
- Division of Hematology, University of British Columbia, Vancouver, BC, Canada; Centre for Health Education Scholarship, University of British Columbia, Vancouver, BC, Canada; Department of Medicine, Vancouver General Hospital, Vancouver, BC, Canada.
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13
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Gunasinghe SD, Peres NG, Goyette J, Gaus K. Biomechanics of T Cell Dysfunctions in Chronic Diseases. Front Immunol 2021; 12:600829. [PMID: 33717081 PMCID: PMC7948521 DOI: 10.3389/fimmu.2021.600829] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Accepted: 01/12/2021] [Indexed: 12/12/2022] Open
Abstract
Understanding the mechanisms behind T cell dysfunctions during chronic diseases is critical in developing effective immunotherapies. As demonstrated by several animal models and human studies, T cell dysfunctions are induced during chronic diseases, spanning from infections to cancer. Although factors governing the onset and the extent of the functional impairment of T cells can differ during infections and cancer, most dysfunctional phenotypes share common phenotypic traits in their immune receptor and biophysical landscape. Through the latest developments in biophysical techniques applied to explore cell membrane and receptor-ligand dynamics, we are able to dissect and gain further insights into the driving mechanisms behind T cell dysfunctions. These insights may prove useful in developing immunotherapies aimed at reinvigorating our immune system to fight off infections and malignancies more effectively. The recent success with checkpoint inhibitors in treating cancer opens new avenues to develop more effective, targeted immunotherapies. Here, we highlight the studies focused on the transformation of the biophysical landscape during infections and cancer, and how T cell biomechanics shaped the immunopathology associated with chronic diseases.
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Affiliation(s)
- Sachith D Gunasinghe
- EMBL Australia Node in Single Molecule Science, University of New South Wales, Sydney, NSW, Australia.,ARC Centre of Excellence in Advanced Molecular Imaging, University of New South Wales, Sydney, NSW, Australia
| | - Newton G Peres
- EMBL Australia Node in Single Molecule Science, University of New South Wales, Sydney, NSW, Australia.,ARC Centre of Excellence in Advanced Molecular Imaging, University of New South Wales, Sydney, NSW, Australia
| | - Jesse Goyette
- EMBL Australia Node in Single Molecule Science, University of New South Wales, Sydney, NSW, Australia.,ARC Centre of Excellence in Advanced Molecular Imaging, University of New South Wales, Sydney, NSW, Australia
| | - Katharina Gaus
- EMBL Australia Node in Single Molecule Science, University of New South Wales, Sydney, NSW, Australia.,ARC Centre of Excellence in Advanced Molecular Imaging, University of New South Wales, Sydney, NSW, Australia
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14
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Singh DK, Singh B, Ganatra SR, Gazi M, Cole J, Thippeshappa R, Alfson KJ, Clemmons E, Gonzalez O, Escobedo R, Lee TH, Chatterjee A, Goez-Gazi Y, Sharan R, Gough M, Alvarez C, Blakley A, Ferdin J, Bartley C, Staples H, Parodi L, Callery J, Mannino A, Klaffke B, Escareno P, Platt RN, Hodara V, Scordo J, Gautam S, Vilanova AG, Olmo-Fontanez A, Schami A, Oyejide A, Ajithdoss DK, Copin R, Baum A, Kyratsous C, Alvarez X, Ahmed M, Rosa B, Goodroe A, Dutton J, Hall-Ursone S, Frost PA, Voges AK, Ross CN, Sayers K, Chen C, Hallam C, Khader SA, Mitreva M, Anderson TJC, Martinez-Sobrido L, Patterson JL, Turner J, Torrelles JB, Dick EJ, Brasky K, Schlesinger LS, Giavedoni LD, Carrion R, Kaushal D. Responses to acute infection with SARS-CoV-2 in the lungs of rhesus macaques, baboons and marmosets. Nat Microbiol 2021; 6:73-86. [PMID: 33340034 PMCID: PMC7890948 DOI: 10.1038/s41564-020-00841-4] [Citation(s) in RCA: 143] [Impact Index Per Article: 47.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Accepted: 11/23/2020] [Indexed: 12/21/2022]
Abstract
Non-human primate models will expedite therapeutics and vaccines for coronavirus disease 2019 (COVID-19) to clinical trials. Here, we compare acute severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection in young and old rhesus macaques, baboons and old marmosets. Macaques had clinical signs of viral infection, mild to moderate pneumonitis and extra-pulmonary pathologies, and both age groups recovered in two weeks. Baboons had prolonged viral RNA shedding and substantially more lung inflammation compared with macaques. Inflammation in bronchoalveolar lavage was increased in old versus young baboons. Using techniques including computed tomography imaging, immunophenotyping, and alveolar/peripheral cytokine response and immunohistochemical analyses, we delineated cellular immune responses to SARS-CoV-2 infection in macaque and baboon lungs, including innate and adaptive immune cells and a prominent type-I interferon response. Macaques developed T-cell memory phenotypes/responses and bystander cytokine production. Old macaques had lower titres of SARS-CoV-2-specific IgG antibody levels compared with young macaques. Acute respiratory distress in macaques and baboons recapitulates the progression of COVID-19 in humans, making them suitable as models to test vaccines and therapies.
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Affiliation(s)
- Dhiraj Kumar Singh
- Southwest National Primate Research Center, San Antonio, TX, USA
- Texas Biomedical Research Institute, San Antonio, TX, USA
| | - Bindu Singh
- Southwest National Primate Research Center, San Antonio, TX, USA
- Texas Biomedical Research Institute, San Antonio, TX, USA
| | - Shashank R Ganatra
- Southwest National Primate Research Center, San Antonio, TX, USA
- Texas Biomedical Research Institute, San Antonio, TX, USA
| | - Michal Gazi
- Texas Biomedical Research Institute, San Antonio, TX, USA
| | - Journey Cole
- Southwest National Primate Research Center, San Antonio, TX, USA
- Texas Biomedical Research Institute, San Antonio, TX, USA
| | - Rajesh Thippeshappa
- Southwest National Primate Research Center, San Antonio, TX, USA
- Texas Biomedical Research Institute, San Antonio, TX, USA
| | | | - Elizabeth Clemmons
- Southwest National Primate Research Center, San Antonio, TX, USA
- Texas Biomedical Research Institute, San Antonio, TX, USA
| | - Olga Gonzalez
- Southwest National Primate Research Center, San Antonio, TX, USA
- Texas Biomedical Research Institute, San Antonio, TX, USA
| | - Ruby Escobedo
- Southwest National Primate Research Center, San Antonio, TX, USA
- Texas Biomedical Research Institute, San Antonio, TX, USA
| | - Tae-Hyung Lee
- Southwest National Primate Research Center, San Antonio, TX, USA
- Texas Biomedical Research Institute, San Antonio, TX, USA
| | - Ayan Chatterjee
- Southwest National Primate Research Center, San Antonio, TX, USA
- Texas Biomedical Research Institute, San Antonio, TX, USA
| | | | - Riti Sharan
- Southwest National Primate Research Center, San Antonio, TX, USA
- Texas Biomedical Research Institute, San Antonio, TX, USA
| | - Maya Gough
- Southwest National Primate Research Center, San Antonio, TX, USA
- Texas Biomedical Research Institute, San Antonio, TX, USA
| | - Cynthia Alvarez
- Southwest National Primate Research Center, San Antonio, TX, USA
- Texas Biomedical Research Institute, San Antonio, TX, USA
| | - Alyssa Blakley
- Southwest National Primate Research Center, San Antonio, TX, USA
- Texas Biomedical Research Institute, San Antonio, TX, USA
| | - Justin Ferdin
- Southwest National Primate Research Center, San Antonio, TX, USA
- Texas Biomedical Research Institute, San Antonio, TX, USA
| | - Carmen Bartley
- Southwest National Primate Research Center, San Antonio, TX, USA
- Texas Biomedical Research Institute, San Antonio, TX, USA
| | - Hilary Staples
- Southwest National Primate Research Center, San Antonio, TX, USA
- Texas Biomedical Research Institute, San Antonio, TX, USA
| | - Laura Parodi
- Southwest National Primate Research Center, San Antonio, TX, USA
- Texas Biomedical Research Institute, San Antonio, TX, USA
| | - Jessica Callery
- Southwest National Primate Research Center, San Antonio, TX, USA
- Texas Biomedical Research Institute, San Antonio, TX, USA
| | - Amanda Mannino
- Southwest National Primate Research Center, San Antonio, TX, USA
- Texas Biomedical Research Institute, San Antonio, TX, USA
| | | | | | - Roy N Platt
- Texas Biomedical Research Institute, San Antonio, TX, USA
| | - Vida Hodara
- Southwest National Primate Research Center, San Antonio, TX, USA
- Texas Biomedical Research Institute, San Antonio, TX, USA
| | - Julia Scordo
- Texas Biomedical Research Institute, San Antonio, TX, USA
| | - Shalini Gautam
- Texas Biomedical Research Institute, San Antonio, TX, USA
| | | | | | - Alyssa Schami
- Texas Biomedical Research Institute, San Antonio, TX, USA
| | | | | | | | - Alina Baum
- Regeneron Pharmaceuticals Inc., Tarrytown, NY, USA
| | | | - Xavier Alvarez
- Southwest National Primate Research Center, San Antonio, TX, USA
- Texas Biomedical Research Institute, San Antonio, TX, USA
| | - Mushtaq Ahmed
- Washington University School of Medicine in St Louis, St Louis, MO, USA
| | - Bruce Rosa
- Washington University School of Medicine in St Louis, St Louis, MO, USA
| | - Anna Goodroe
- Southwest National Primate Research Center, San Antonio, TX, USA
- Texas Biomedical Research Institute, San Antonio, TX, USA
| | - John Dutton
- Southwest National Primate Research Center, San Antonio, TX, USA
- Texas Biomedical Research Institute, San Antonio, TX, USA
| | - Shannan Hall-Ursone
- Southwest National Primate Research Center, San Antonio, TX, USA
- Texas Biomedical Research Institute, San Antonio, TX, USA
| | - Patrice A Frost
- Southwest National Primate Research Center, San Antonio, TX, USA
- Texas Biomedical Research Institute, San Antonio, TX, USA
| | - Andra K Voges
- Southwest National Primate Research Center, San Antonio, TX, USA
- Texas Biomedical Research Institute, San Antonio, TX, USA
- Veterinary Imaging Consulting of South Texas, San Antonio, TX, USA
| | - Corinna N Ross
- Southwest National Primate Research Center, San Antonio, TX, USA
- Texas Biomedical Research Institute, San Antonio, TX, USA
| | - Ken Sayers
- Southwest National Primate Research Center, San Antonio, TX, USA
- Texas Biomedical Research Institute, San Antonio, TX, USA
| | - Christopher Chen
- Southwest National Primate Research Center, San Antonio, TX, USA
- Texas Biomedical Research Institute, San Antonio, TX, USA
| | - Cory Hallam
- Texas Biomedical Research Institute, San Antonio, TX, USA
| | - Shabaana A Khader
- Washington University School of Medicine in St Louis, St Louis, MO, USA
| | - Makedonka Mitreva
- Washington University School of Medicine in St Louis, St Louis, MO, USA
| | | | | | | | - Joanne Turner
- Texas Biomedical Research Institute, San Antonio, TX, USA
| | | | - Edward J Dick
- Southwest National Primate Research Center, San Antonio, TX, USA
- Texas Biomedical Research Institute, San Antonio, TX, USA
| | - Kathleen Brasky
- Southwest National Primate Research Center, San Antonio, TX, USA
- Texas Biomedical Research Institute, San Antonio, TX, USA
| | - Larry S Schlesinger
- Southwest National Primate Research Center, San Antonio, TX, USA
- Texas Biomedical Research Institute, San Antonio, TX, USA
| | - Luis D Giavedoni
- Southwest National Primate Research Center, San Antonio, TX, USA.
- Texas Biomedical Research Institute, San Antonio, TX, USA.
| | - Ricardo Carrion
- Southwest National Primate Research Center, San Antonio, TX, USA.
- Texas Biomedical Research Institute, San Antonio, TX, USA.
| | - Deepak Kaushal
- Southwest National Primate Research Center, San Antonio, TX, USA.
- Texas Biomedical Research Institute, San Antonio, TX, USA.
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15
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Wang S, Zhang Q, Hui H, Agrawal K, Karris MAY, Rana TM. An atlas of immune cell exhaustion in HIV-infected individuals revealed by single-cell transcriptomics. Emerg Microbes Infect 2020; 9:2333-2347. [PMID: 32954948 PMCID: PMC7646563 DOI: 10.1080/22221751.2020.1826361] [Citation(s) in RCA: 48] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Revised: 09/15/2020] [Accepted: 09/16/2020] [Indexed: 02/07/2023]
Abstract
Chronic infection with human immunodeficiency virus (HIV) can cause progressive loss of immune cell function, or exhaustion, which impairs control of virus replication. However, little is known about the development and maintenance, as well as heterogeneity of immune cell exhaustion. Here, we investigated the effects of HIV infection on immune cell exhaustion at the transcriptomic level by analyzing single-cell RNA sequencing of peripheral blood mononuclear cells from four healthy subjects (37,847 cells) and six HIV-infected donors (28,610 cells). We identified nine immune cell clusters and eight T cell subclusters, and three of these (exhausted CD4+ and CD8+ T cells and interferon-responsive CD8+ T cells) were detected only in samples from HIV-infected donors. An inhibitory receptor KLRG1 was identified in a HIV-1 specific exhausted CD8+ T cell population expressing KLRG1, TIGIT, and T-betdimEomeshi markers. Ex-vivo antibody blockade of KLRG1 restored the function of HIV-specific exhausted CD8+ T cells demonstrating the contribution of KLRG1+ population to T cell exhaustion and providing an immunotherapy target to treat HIV chronic infection. These data provide a comprehensive analysis of gene signatures associated with immune cell exhaustion during HIV infection, which could be useful in understanding exhaustion mechanisms and developing new cure therapies.
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Affiliation(s)
- Shaobo Wang
- Department of Pediatrics, Division of Genetics, Institute for Genomic Medicine, Program in Immunology, University of California San Diego, La Jolla, CA, USA
- UCSD Center for AIDS Research, University of California San Diego, La Jolla, CA, USA
| | - Qiong Zhang
- Department of Pediatrics, Division of Genetics, Institute for Genomic Medicine, Program in Immunology, University of California San Diego, La Jolla, CA, USA
- UCSD Center for AIDS Research, University of California San Diego, La Jolla, CA, USA
| | - Hui Hui
- Department of Pediatrics, Division of Genetics, Institute for Genomic Medicine, Program in Immunology, University of California San Diego, La Jolla, CA, USA
- Department of Biology, Bioinformatics Program, University of California San Diego, La Jolla, CA, USA
| | - Kriti Agrawal
- Department of Pediatrics, Division of Genetics, Institute for Genomic Medicine, Program in Immunology, University of California San Diego, La Jolla, CA, USA
- Department of Biology, Bioinformatics Program, University of California San Diego, La Jolla, CA, USA
| | - Maile Ann Young Karris
- Department of Medicine, Division of Infectious Diseases, University of California San Diego, La Jolla, CA, USA
| | - Tariq M. Rana
- Department of Pediatrics, Division of Genetics, Institute for Genomic Medicine, Program in Immunology, University of California San Diego, La Jolla, CA, USA
- UCSD Center for AIDS Research, University of California San Diego, La Jolla, CA, USA
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16
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Cannabinoid-Induced Immunomodulation during Viral Infections: A Focus on Mitochondria. Viruses 2020; 12:v12080875. [PMID: 32796517 PMCID: PMC7472050 DOI: 10.3390/v12080875] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Revised: 08/04/2020] [Accepted: 08/07/2020] [Indexed: 02/07/2023] Open
Abstract
This review examines the impact of cannabinoids on viral infections, as well as its effects on the mitochondria of the nervous and immune system. The paper conveys information about the beneficial and negative impacts of cannabinoids on viral infections, especially HIV-1. These include effects on the inflammatory response as well as neuroprotective effects. We also explore non-apoptotic mitochondrial pathways modulated by the activity of cannabinoids, resulting in modifications to cellular functions. As a large part of the literature derives from studies of the nervous system, we first compile the information related to mitochondrial functions in this system, particularly through the CB1 receptor. Finally, we reflect on how this knowledge could complement what has been demonstrated in the immune system, especially in the context of the CB2 receptor and Ca2+ uptake. The overall conclusion of the review is that cannabinoids have the potential to affect a broad range of cell types through mitochondrial modulation, be it through receptor-specific action or not, and that this pathway has a potential implication in cases of viral infection.
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17
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Somay K, Çöpür S, Osmanbaşoğlu E, Masyan H, Arslan H, Akay OM, Tekin S, Ferhanoğlu B. HIV-ASSOCIATED NON HODGKIN LYMPHOMA: A CASE SERIES STUDY FROM TURKEY. Afr J Infect Dis 2020; 14:42-47. [PMID: 33884350 PMCID: PMC8047295 DOI: 10.21010/ajid.v14i2.7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Revised: 05/14/2020] [Accepted: 06/11/2020] [Indexed: 11/23/2022] Open
Abstract
Background: Human immunodeficiency virus (HIV) is a global health concern with major risks for opportunistic infections and predisposition to malignancies including Kaposi sarcoma associated with Human Herpes Virus-8 (HHV-8) and non-Hodgkin lymphoma (NHL) commonly associated with Epstein Barr Virus (EBV). Although the exact mechanisms of predisposition to certain malignancies are unclear, HIV (+) cancer patients typically have poorer prognosis. Materials and Methods: We included all five HIV positive NHL patients receiving antiretroviral therapy (ART) and chemotherapy in our clinic and aim to determine their follow-up outcomes associated with ART. Results: The use of ART in conjunction with chemotherapy regimens lead to better therapeutic outcome in our cases with no mortality over three years of follow-up despite high rates of poor prognostic factors and studies demonstrating 1-year survival rates of approximately 30% in HIV-associated lymphoma. No significant adverse effect has been recorded. Conclusion: We recommend use of ART along with chemotherapy regimens in HIV positive lymphoma patients for better treatment response.
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Affiliation(s)
- Kayra Somay
- Internal Medicine Department, Koç University Medical School, İstanbul, Turkey
| | - Sidar Çöpür
- Koç University Medical School, İstanbul, Turkey
| | | | - Helin Masyan
- Internal Medicine Department, Koç University Hospital, İstanbul, Turkey
| | - Harun Arslan
- Internal Medicine Department, Koç University Hospital, İstanbul, Turkey
| | - Olga Meltem Akay
- Hematology Department, Koç University Medical School, Istanbul, Turkey
| | - Süda Tekin
- Infectious Diseases and Clinical Microbiology Department, Koç University Medical School, Istanbul, Turkey
| | - Burhan Ferhanoğlu
- Hematology Department, Koç University Medical School, Istanbul, Turkey
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18
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Badura R, Foxall RB, Ligeiro D, Rocha M, Godinho-Santos A, Trombetta AC, Sousa AE. Early ART in Acute HIV-1 Infection: Impact on the B-Cell Compartment. Front Cell Infect Microbiol 2020; 10:347. [PMID: 32766164 PMCID: PMC7378391 DOI: 10.3389/fcimb.2020.00347] [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: 01/14/2020] [Accepted: 06/05/2020] [Indexed: 12/26/2022] Open
Abstract
HIV-1 infection induces B cell defects, not fully recovered upon antiretroviral therapy (ART). Acute infection and the early start of ART provide unique settings to address the impact of HIV on the B cell compartment. We took advantage of a cohort of 21 seroconverters, grouped according to the presence of severe manifestations likely mediated by antibodies or immune complexes, such as Guillain-Barré syndrome and autoimmune thrombocytopenic purpura, with a follow-up of 8 weeks upon effective ART. We combined B and T cell phenotyping with serum immunoglobulin level measurement and quantification of sj-KRECs and ΔB to estimate bone marrow output and peripheral proliferative history of B cells, respectively. We observed marked B cell disturbances, notably a significant expansion of cells expressing low levels of CD21, in parallel with markers of both impaired bone marrow output and increased peripheral B cell proliferation. This B cell dysregulation is likely to contribute to the severe immune-mediated conditions, as attested by the higher serum IgG and the reduced levels of sj-KRECs with increased ΔB in these individuals as compared to those patients with mild disease. Nevertheless, upon starting ART, the dynamic of B cell recovery was not distinct in the two groups, featuring both persistent alterations by week 8. Overall, we showed for the first time that acute HIV-1 infection is associated with decreased bone marrow B cell output assessed by sj-KRECs. Our study emphasizes the need to intervene in both bone marrow and peripheral responses to facilitate B cell recovery during acute HIV-1 infection.
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Affiliation(s)
- Robert Badura
- Instituto de Medicina Molecular João Lobo Antunes, Faculdade de Medicina, Universidade de Lisboa, Lisbon, Portugal.,Serviço de Doenças Infecciosas, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal
| | - Russell B Foxall
- Instituto de Medicina Molecular João Lobo Antunes, Faculdade de Medicina, Universidade de Lisboa, Lisbon, Portugal
| | - Dario Ligeiro
- Centro de Sangue e Transplantação de Lisboa, Instituto Português de Sangue e Transplantação, IP, Lisbon, Portugal
| | - Miguel Rocha
- Grupo de Ativistas em Tratamentos, Community Based Center for HIV and STD, CheckpointLX, Lisbon, Portugal
| | - Ana Godinho-Santos
- Instituto de Medicina Molecular João Lobo Antunes, Faculdade de Medicina, Universidade de Lisboa, Lisbon, Portugal
| | - Amelia C Trombetta
- Instituto de Medicina Molecular João Lobo Antunes, Faculdade de Medicina, Universidade de Lisboa, Lisbon, Portugal
| | - Ana E Sousa
- Instituto de Medicina Molecular João Lobo Antunes, Faculdade de Medicina, Universidade de Lisboa, Lisbon, Portugal
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19
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Li C, Romero-Masters JC, Huebner S, Ohashi M, Hayes M, Bristol JA, Nelson SE, Eichelberg MR, Van Sciver N, Ranheim EA, Scott RS, Johannsen EC, Kenney SC. EBNA2-deleted Epstein-Barr virus (EBV) isolate, P3HR1, causes Hodgkin-like lymphomas and diffuse large B cell lymphomas with type II and Wp-restricted latency types in humanized mice. PLoS Pathog 2020; 16:e1008590. [PMID: 32542010 PMCID: PMC7316346 DOI: 10.1371/journal.ppat.1008590] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Revised: 06/25/2020] [Accepted: 05/01/2020] [Indexed: 12/15/2022] Open
Abstract
EBV transforms B cells in vitro and causes human B-cell lymphomas including classical Hodgkin lymphoma (CHL), Burkitt lymphoma (BL) and diffuse large B-cell lymphoma (DLBCL). The EBV latency protein, EBNA2, transcriptionally activates the promoters of all latent viral protein-coding genes expressed in type III EBV latency and is essential for EBV's ability to transform B cells in vitro. However, EBNA2 is not expressed in EBV-infected CHLs and BLs in humans. EBV-positive CHLs have type II latency and are largely driven by the EBV LMP1/LMP2A proteins, while EBV-positive BLs, which usually have type I latency are largely driven by c-Myc translocations, and only express the EBNA1 protein and viral non-coding RNAs. Approximately 15% of human BLs contain naturally occurring EBNA2-deleted viruses that support a form of viral latency known as Wp-restricted (expressing the EBNA-LP, EBNA3A/3B/3C, EBNA1 and BHRF1 proteins), but whether Wp-restricted latency and/or EBNA2-deleted EBV can induce lymphomas in humanized mice, or in the absence of c-Myc translocations, is unknown. Here we show that a naturally occurring EBNA2-deleted EBV strain (P3HR1) isolated from a human BL induces EBV-positive B-cell lymphomas in a subset of infected cord blood-humanized (CBH) mice. Furthermore, we find that P3HR1-infected lymphoma cells support two different viral latency types and phenotypes that are mutually exclusive: 1) Large (often multinucleated), CD30-positive, CD45-negative cells reminiscent of the Reed-Sternberg (RS) cells in CHL that express high levels of LMP1 but not EBNA-LP (consistent with type II viral latency); and 2) smaller monomorphic CD30-negative DLBCL-like cells that express EBNA-LP and EBNA3A but not LMP1 (consistent with Wp-restricted latency). These results reveal that EBNA2 is not absolutely required for EBV to form tumors in CBH mice and suggest that P3HR1 virus can be used to model EBV positive lymphomas with both Wp-restricted and type II latency in vivo.
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MESH Headings
- Animals
- Cell Line
- Epstein-Barr Virus Infections/genetics
- Epstein-Barr Virus Infections/metabolism
- Epstein-Barr Virus Infections/pathology
- Epstein-Barr Virus Infections/virology
- Epstein-Barr Virus Nuclear Antigens/genetics
- Epstein-Barr Virus Nuclear Antigens/metabolism
- Gene Deletion
- Herpesvirus 4, Human/pathogenicity
- Herpesvirus 4, Human/physiology
- Hodgkin Disease/genetics
- Hodgkin Disease/metabolism
- Hodgkin Disease/pathology
- Hodgkin Disease/virology
- Humans
- Lymphoma, Large B-Cell, Diffuse/genetics
- Lymphoma, Large B-Cell, Diffuse/metabolism
- Lymphoma, Large B-Cell, Diffuse/pathology
- Lymphoma, Large B-Cell, Diffuse/virology
- Mice
- Viral Proteins/genetics
- Viral Proteins/metabolism
- Virus Latency
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Affiliation(s)
- Chunrong Li
- Department of Oncology, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, United States of America
| | - James C. Romero-Masters
- Department of Oncology, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, United States of America
| | - Shane Huebner
- Department of Oncology, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, United States of America
| | - Makoto Ohashi
- Department of Oncology, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, United States of America
| | - Mitchell Hayes
- Department of Oncology, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, United States of America
| | - Jillian A. Bristol
- Department of Oncology, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, United States of America
| | - Scott E. Nelson
- Department of Oncology, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, United States of America
| | - Mark R. Eichelberg
- Department of Oncology, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, United States of America
| | - Nicholas Van Sciver
- Department of Oncology, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, United States of America
- Department of Pathology and Laboratory Medicine, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, United States of America
| | - Erik A. Ranheim
- Department of Pathology and Laboratory Medicine, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, United States of America
| | - Rona S. Scott
- Center for Molecular and Tumor Virology, LSU Health Sciences Center, Shreveport, Louisiana, United States of America
| | - Eric C. Johannsen
- Department of Oncology, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, United States of America
- Department of Medicine, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, United States of America
| | - Shannon C. Kenney
- Department of Oncology, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, United States of America
- Department of Medicine, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, United States of America
- * E-mail:
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20
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Early antiretroviral therapy-treated perinatally HIV-infected seronegative children demonstrate distinct long-term persistence of HIV-specific T-cell and B-cell memory. AIDS 2020; 34:669-680. [PMID: 32167989 DOI: 10.1097/qad.0000000000002485] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
OBJECTIVE To investigate long-term persistence of HIV-specific lymphocyte immunity in perinatally HIV-infected children treated within the first year of life. DESIGN Twenty perinatally HIV-infected children who received ART therapy within the first year of life (early treated) and with stable viral control (>5 years) were grouped according to their serological response to HIV. METHODS Western blot analysis and ELISA defined 14 HIV-seropositive and six seronegative patients. Frequencies of gp140-specific T-cell and B-cell, and T-cell cytokine production were quantified by flow cytometry in both seronegatives and seropositives. Transcriptional signatures in purified gp140-specific B-cell subsets, in response to in-vitro stimulation with HIV peptides was evaluated by multiplex RT-PCR. RESULTS Gp140-specific T cells and B cells persist at similar levels in both groups. A higher production of IL-21 in gp140-specific T cells was found in seropositives vs. seronegatives (P = 0.003). Gene expression in switched IgM-IgD- gp140-specific memory B cells after stimulation with HIV peptides in vitro demonstrated a differential expression of genes involved in signal transduction and activation after BCR/TLR triggering and B-cell activation. Genes relating to antibody production (PRDM1) and T-B cognate stimulation (CXCR4, IL21R) were differentially induced after in-vitro stimulation in seronegatives vs. seropositives suggesting a truncated process of B-cell maturation. CONCLUSION HIV-specific memory B and T cells persist in early treated regardless their serological status. Seronegatives and seropositives are distinguished by gp140-specific T-cell function and by distinct transcriptional signatures of gp140-specific B cells after in-vitro stimulation, presumably because of a different antigen exposure. Such qualitative insights may inform future immunotherapeutic interventions.
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21
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Loucif H, Dagenais-Lussier X, Beji C, Telittchenko R, Routy JP, van Grevenynghe J. Plasticity in T-cell mitochondrial metabolism: A necessary peacekeeper during the troubled times of persistent HIV-1 infection. Cytokine Growth Factor Rev 2020; 55:26-36. [PMID: 32151523 DOI: 10.1016/j.cytogfr.2020.02.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2019] [Revised: 02/08/2020] [Accepted: 02/12/2020] [Indexed: 01/02/2023]
Abstract
The notion of immuno-metabolism refers to the crosstalk between key metabolic pathways and the development/maintenance of protective immunity in the context of physiological processes and anti-microbial defenses. Enthusiasm for immuno-metabolism in the context of HIV-1 infection, especially among T-cell lineages, continues to grow over time as science opens new therapeutic perspectives to limit viral pathogenesis and to boost anti-viral responses. The idea of "metabolism as a therapeutic target" is called metabolic reprogramming and is based on the use of specific metabolism-targeting drugs that are currently available for cancer therapy. In this review, we will focus on the evidence that shows the key role of mitochondria, the cell's powerhouses, and their ability to use diverse metabolic resources (referred to as metabolic plasticity) in providing optimal immune T-cell protection among HIV-1-infected patients. Conversely, we highlight observations indicating that mitochondria metabolic dysfunction associated with excessive glucose dependency, a phenomenon reported as "Warburg effect", results in the inability to mount and maintain effective T-cell-dependent immunity during persistent HIV-1 infection. Therefore, helping mitochondria to regain the metabolic plasticity and allow specific T-cells to adapt and thrive under unfavorable environmental conditions during HIV-1 infection may represent the next generation of combinatory treatment options for patients.
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Affiliation(s)
- Hamza Loucif
- Institut National la Recherche Scientifique (INRS)-Institut Armand-Frappier, 531 Boulevard des Prairies, Laval, H7V 1B7 QC, Canada
| | - Xavier Dagenais-Lussier
- Institut National la Recherche Scientifique (INRS)-Institut Armand-Frappier, 531 Boulevard des Prairies, Laval, H7V 1B7 QC, Canada
| | - Cherifa Beji
- Institut National la Recherche Scientifique (INRS)-Institut Armand-Frappier, 531 Boulevard des Prairies, Laval, H7V 1B7 QC, Canada
| | - Roman Telittchenko
- Institut National la Recherche Scientifique (INRS)-Institut Armand-Frappier, 531 Boulevard des Prairies, Laval, H7V 1B7 QC, Canada
| | - Jean-Pierre Routy
- Chronic Viral Illness Service and Division of Hematology, McGill University Health Centre, Glen site, Montréal, QC, Canada
| | - Julien van Grevenynghe
- Institut National la Recherche Scientifique (INRS)-Institut Armand-Frappier, 531 Boulevard des Prairies, Laval, H7V 1B7 QC, Canada.
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22
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Zarak-Crnkovic M, Kania G, Jaźwa-Kusior A, Czepiel M, Wijnen WJ, Czyż J, Müller-Edenborn B, Vdovenko D, Lindner D, Gil-Cruz C, Bachmann M, Westermann D, Ludewig B, Distler O, Lüscher TF, Klingel K, Eriksson U, Błyszczuk P. Heart non-specific effector CD4 + T cells protect from postinflammatory fibrosis and cardiac dysfunction in experimental autoimmune myocarditis. Basic Res Cardiol 2019; 115:6. [PMID: 31863205 PMCID: PMC6925074 DOI: 10.1007/s00395-019-0766-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Accepted: 12/04/2019] [Indexed: 12/14/2022]
Abstract
Heart-specific CD4+ T cells have been implicated in development and progression of myocarditis in mice and in humans. Here, using mouse models of experimental autoimmune myocarditis (EAM) we investigated the role of heart non-specific CD4+ T cells in the progression of the disease. Heart non-specific CD4+ T cells were obtained from DO11.10 mice expressing transgenic T cell receptor recognizing chicken ovalbumin. We found that heart infiltrating CD4+ T cells expressed exclusively effector (Teff) phenotype in the EAM model and in hearts of patients with lymphocytic myocarditis. Adoptive transfer experiments showed that while heart-specific Teff infiltrated the heart shortly after injection, heart non-specific Teff effectively accumulated during myocarditis and became the major heart-infiltrating CD4+ T cell subset at later stage. Restimulation of co-cultured heart-specific and heart non-specific CD4+ T cells with alpha-myosin heavy chain antigen showed mainly Th1/Th17 response for heart-specific Teff and up-regulation of a distinct set of extracellular signalling molecules in heart non-specific Teff. Adoptive transfer of heart non-specific Teff in mice with myocarditis did not affect inflammation severity at the peak of disease, but protected the heart from adverse post-inflammatory fibrotic remodelling and cardiac dysfunction at later stages of disease. Furthermore, mouse and human Teff stimulated in vitro with common gamma cytokines suppressed expression of profibrotic genes, reduced amount of α-smooth muscle actin filaments and decreased contraction of cardiac fibroblasts. In this study, we provided a proof-of-concept that heart non-specific Teff cells could effectively contribute to myocarditis and protect the heart from the dilated cardiomyopathy outcome.
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Affiliation(s)
- Martina Zarak-Crnkovic
- Cardioimmunology, Center for Molecular Cardiology, University of Zurich, Zurich, Switzerland
| | - Gabriela Kania
- Department of Rheumatology, Center of Experimental Rheumatology, University Hospital Zurich, Zurich, Switzerland
| | | | - Marcin Czepiel
- Department of Clinical Immunology, Jagiellonian University Medical College, University Children's Hospital, Wielicka 265, 30-663, Cracow, Poland
| | - Winandus J Wijnen
- Cardioimmunology, Center for Molecular Cardiology, University of Zurich, Zurich, Switzerland
| | - Jarosław Czyż
- Department of Cell Biology, Jagiellonian University, Cracow, Poland
| | - Björn Müller-Edenborn
- Cardioimmunology, Center for Molecular Cardiology, University of Zurich, Zurich, Switzerland
- Department of Medicine, GZO-Zurich Regional Health Center, Wetzikon, Switzerland
| | - Daria Vdovenko
- Cardioimmunology, Center for Molecular Cardiology, University of Zurich, Zurich, Switzerland
| | - Diana Lindner
- Clinic for General and Interventional Cardiology, University Heart Center Hamburg, Hamburg, Germany
| | - Cristina Gil-Cruz
- Institute of Immunobiology, Kantonsspital St. Gallen, St. Gallen, Switzerland
| | - Marta Bachmann
- Cardioimmunology, Center for Molecular Cardiology, University of Zurich, Zurich, Switzerland
| | - Dirk Westermann
- Clinic for General and Interventional Cardiology, University Heart Center Hamburg, Hamburg, Germany
| | - Burkhard Ludewig
- Institute of Immunobiology, Kantonsspital St. Gallen, St. Gallen, Switzerland
| | - Oliver Distler
- Department of Rheumatology, Center of Experimental Rheumatology, University Hospital Zurich, Zurich, Switzerland
| | - Thomas F Lüscher
- Department of Cardiology, University Heart Center, University Hospital Zurich, Zurich, Switzerland
| | - Karin Klingel
- Cardiopathology, Institute for Pathology and Neuropathology, University of Tubingen, Tubingen, Germany
| | - Urs Eriksson
- Cardioimmunology, Center for Molecular Cardiology, University of Zurich, Zurich, Switzerland
- Department of Medicine, GZO-Zurich Regional Health Center, Wetzikon, Switzerland
| | - Przemysław Błyszczuk
- Department of Rheumatology, Center of Experimental Rheumatology, University Hospital Zurich, Zurich, Switzerland.
- Department of Clinical Immunology, Jagiellonian University Medical College, University Children's Hospital, Wielicka 265, 30-663, Cracow, Poland.
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23
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The activation of bystander CD8 + T cells and their roles in viral infection. Exp Mol Med 2019; 51:1-9. [PMID: 31827070 PMCID: PMC6906361 DOI: 10.1038/s12276-019-0316-1] [Citation(s) in RCA: 56] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Revised: 05/09/2019] [Accepted: 07/05/2019] [Indexed: 02/06/2023] Open
Abstract
During viral infections, significant numbers of T cells are activated in a T cell receptor-independent and cytokine-dependent manner, a phenomenon referred to as "bystander activation." Cytokines, including type I interferons, interleukin-18, and interleukin-15, are the most important factors that induce bystander activation of T cells, each of which plays a somewhat different role. Bystander T cells lack specificity for the pathogen, but can nevertheless impact the course of the immune response to the infection. For example, bystander-activated CD8+ T cells can participate in protective immunity by secreting cytokines, such as interferon-γ. They also mediate host injury by exerting cytotoxicity that is facilitated by natural killer cell-activating receptors, such as NKG2D, and cytolytic molecules, such as granzyme B. Interestingly, it has been recently reported that there is a strong association between the cytolytic function of bystander-activated CD8+ T cells and host tissue injury in patients with acute hepatitis A virus infection. The current review addresses the induction of bystander CD8+ T cells, their effector functions, and their potential roles in immunity to infection, immunopathology, and autoimmunity.
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24
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Nozarian Z, Mehrtash V, Abdollahi A, Aeinehsazi S, Khorsand A, Eftekhar-Javadi A, Safaei M, Nili F. Serum protein electrophoresis pattern in patients living with HIV: frequency of possible abnormalities in Iranian patients. IRANIAN JOURNAL OF MICROBIOLOGY 2019; 11:440-447. [PMID: 32148675 PMCID: PMC7049319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
BACKGROUND AND OBJECTIVES This prospective case-control study was conducted to evaluate abnormal serum protein electrophoresis (SPEP) patterns in patients living with human immunodeficiency virus (HIV) and its relation with disease severity markers and anti-retroviral treatment status. MATERIALS AND METHODS Thirty-seven HIV-positive patients and 24 healthy individuals were evaluated in the course of this study. The healthy HIV-negative individuals were selected as control group. Pregnant women, patients with malignancies, children, hepatitis B- and/or C-positive patients, those with a history of an autoimmune disease, or previous corticosteroid administration were excluded. SPEP-which detects serum levels of albumin, total protein, gammaglobulin-, CD4+ T-cell counts, viral load, and antiretroviral treatment status were assessed. Data were analyzed by SPSS™ software. RESULTS Twelve patients (32 percent) demonstrated polyclonal gammopathy on SPEP, while only 1 (4 percent) healthy individual had the same pattern (P-value = 0.007). No statistically significant connection between SPEP patterns and antiretroviral treatment status was observed (P-value > 0.05). Interestingly no statistically significant relationship between CD4+ T-cell counts and polyclonal gammopathy was discerned. No statistically significant difference was observed between the two groups with regards to serum albumin and total protein levels. The serum albumin to total protein percentage, serum gamma globulin to total protein percentage, and serum albumin to globulin ratio was compared between the groups and a statistically significant difference was observed. CONCLUSION Polyclonal gammopathy on SPEP is common among HIV-infected patients. Moreover, the SPEP patterns cannot be used as an indication of a patient's negative or positive response to treatment.
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Affiliation(s)
- Zohreh Nozarian
- Department of Pathology, School of Medicine, Imam Hospital Complex, Tehran University of Medical Sciences, Tehran, Iran
| | - Vahid Mehrtash
- Department of Pathology, School of Medicine, Imam Hospital Complex, Tehran University of Medical Sciences, Tehran, Iran
| | - Alireza Abdollahi
- Department of Pathology, School of Medicine, Imam Hospital Complex, Tehran University of Medical Sciences, Tehran, Iran,Corresponding author: Alireza Abdollahi, MD, Department of Pathology, School of Medicine, Tehran University of Medical Sciences, Imam Hospital Complex, Tehran, Iran. Tel: +98-912-1220588, Fax: +98-21-88277321,
| | - Saloomeh Aeinehsazi
- Department of Pathology, School of Medicine, Imam Hospital Complex, Tehran University of Medical Sciences, Tehran, Iran
| | - Atieh Khorsand
- Department of Pathology, School of Medicine, Imam Hospital Complex, Tehran University of Medical Sciences, Tehran, Iran
| | - Arezoo Eftekhar-Javadi
- Department of Pathology, School of Medicine, Sina Hospital, Tehran University of Medical Sciences, Tehran, Iran
| | - Masoumeh Safaei
- Department of Pathology, School of Medicine, Imam Hospital Complex, Tehran University of Medical Sciences, Tehran, Iran
| | - Fatemeh Nili
- Department of Pathology, School of Medicine, Imam Hospital Complex, Tehran University of Medical Sciences, Tehran, Iran
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25
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Vranjkovic A, Deonarine F, Kaka S, Angel JB, Cooper CL, Crawley AM. Direct-Acting Antiviral Treatment of HCV Infection Does Not Resolve the Dysfunction of Circulating CD8 + T-Cells in Advanced Liver Disease. Front Immunol 2019; 10:1926. [PMID: 31456810 PMCID: PMC6700371 DOI: 10.3389/fimmu.2019.01926] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2018] [Accepted: 07/30/2019] [Indexed: 02/06/2023] Open
Abstract
Chronic hepatitis C virus (HCV) infection disrupts immune functions, including that of cytotoxic CD8+ T-cells which are important mediators of immune response. While HCV cure aims to eliminate long term sequelae of infection, whether direct-acting antiviral (DAA) treatment results in immune reconstitution remains unclear. We and others have reported generalized CD8+ T-cell dysfunction in chronic HCV infection and our research suggests that the degree of liver damage is a factor in this process. Our recent research indicates that liver fibrosis is not readily reversed after DAA-mediated clearance of chronic HCV infection. We therefore examined the function of circulating CD8+ T-cell subsets in chronic HCV infection in the context of liver fibrosis severity, determined by ultrasound elastography and Metavir F-score system. We observed progressive shifts in CD8+ T-cell subset distribution in HCV-infected individuals with advanced liver fibrosis (F4) compared to minimal fibrosis (F0-1) or uninfected controls, and this remained unchanged after viral cure. Impaired CD8+ T-cell function was observed as a reduced proportion of CD107+ and perforin+ late effector memory cells in HCV+(F4) and HCV+(F0-1) individuals, respectively. In HCV+(F4) individuals, nearly all CD8+ T-cell subsets had an elevated proportion of perforin+ cells while naïve cells had increased proportions of IFN-γ+ and CD107+ cells. These exaggerated CD8+ T-cell activities were not resolved when evaluated 24 weeks after completion of DAA therapy and HCV clearance. This was further supported by sustained, high levels of cell proliferation and cytolytic activity. Furthermore, DAA therapy had no effect on elevated concentrations of systemic inflammatory cytokines and decreased levels of inhibitory TGF-β in the plasma of HCV+(F4) individuals, suggesting HCV infection and advanced liver disease result in a long-lasting immune activating microenvironment. These data demonstrate that in chronic HCV infection, liver fibrosis severity is associated with generalized hyperfunctional CD8+ T-cells, particularly with perforin production and cytotoxicity, and this persists after viral clearance. Whether DAA therapy will eliminate other related long-term sequelae in HCV+(F4) individuals remains an important research question.
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Affiliation(s)
- Agatha Vranjkovic
- Chronic Disease Program, Ottawa Hospital Research Institute, Ottawa, ON, Canada
| | - Felicia Deonarine
- Chronic Disease Program, Ottawa Hospital Research Institute, Ottawa, ON, Canada.,Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, ON, Canada
| | - Shaima Kaka
- Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, ON, Canada
| | - Jonathan B Angel
- Chronic Disease Program, Ottawa Hospital Research Institute, Ottawa, ON, Canada.,Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, ON, Canada.,Division of Infectious Diseases, The Ottawa Hospital, Ottawa, ON, Canada
| | - Curtis L Cooper
- Division of Infectious Diseases, The Ottawa Hospital, Ottawa, ON, Canada.,School of Epidemiology and Public Health, University of Ottawa, Ottawa, ON, Canada.,Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, ON, Canada
| | - Angela M Crawley
- Chronic Disease Program, Ottawa Hospital Research Institute, Ottawa, ON, Canada.,Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, ON, Canada.,Division of Infectious Diseases, The Ottawa Hospital, Ottawa, ON, Canada.,Department of Biology, Carleton University, Ottawa, ON, Canada
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26
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Liechti T, Kadelka C, Braun DL, Kuster H, Böni J, Robbiani M, Günthard HF, Trkola A. Widespread B cell perturbations in HIV-1 infection afflict naive and marginal zone B cells. J Exp Med 2019; 216:2071-2090. [PMID: 31221742 PMCID: PMC6719425 DOI: 10.1084/jem.20181124] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2018] [Revised: 02/07/2019] [Accepted: 05/24/2019] [Indexed: 12/18/2022] Open
Abstract
Liechti et al. demonstrate severe B cell perturbations in HIV-1 infection beyond described effects on memory B cells. Naive and marginal zone B cells down-regulate CD21 and display chemokine receptor and activation marker signatures associated with inflammation and diminished response to stimulation. Perturbations in B cells are a hallmark of HIV-1 infection. This is signified by increased numbers of exhausted CD21neg memory B cells, driven by continuous antigen-specific and bystander activation. Using high-dimensional flow cytometry, we demonstrate that this exhausted phenotype is also prevalent among peripheral antigen-inexperienced naive and marginal zone (MZ) B cells in acute and chronic HIV-1 infection. A substantial fraction of naive and MZ B cells exhibit down-regulated CD21 levels and diminished response to B cell receptor (BCR)–dependent stimulation. Compared with CD21pos subsets, the CD21neg naive and MZ B cells differ in the expression of chemokine receptors and activation markers. Effective antiretroviral treatment normalizes peripheral naive and MZ B cell populations. Our results emphasize a more widely spread impairment of B cells in HIV-1 infection than previously appreciated, including antigen-inexperienced cells. This highlights the importance of monitoring functional capacities of naive B cells in HIV-1 infection, as exhausted CD21neg naive B cells may severely impair induction of novel B cell responses.
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Affiliation(s)
- Thomas Liechti
- Institute of Medical Virology, University of Zurich, Zurich, Switzerland
| | - Claus Kadelka
- Institute of Medical Virology, University of Zurich, Zurich, Switzerland.,Division of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, Zurich, Switzerland
| | - Dominique L Braun
- Institute of Medical Virology, University of Zurich, Zurich, Switzerland.,Division of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, Zurich, Switzerland
| | - Herbert Kuster
- Institute of Medical Virology, University of Zurich, Zurich, Switzerland.,Division of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, Zurich, Switzerland
| | - Jürg Böni
- Institute of Medical Virology, University of Zurich, Zurich, Switzerland
| | - Melissa Robbiani
- Center for Biomedical Research, Population Council, New York, NY
| | - Huldrych F Günthard
- Institute of Medical Virology, University of Zurich, Zurich, Switzerland.,Division of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, Zurich, Switzerland
| | - Alexandra Trkola
- Institute of Medical Virology, University of Zurich, Zurich, Switzerland
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27
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Giordano D, Castellucci A, Merli F, Garlassi E, Pernice C. HIV-related non-Hodgkin Lymphoma. Case report and review of the literature. ACTA BIO-MEDICA : ATENEI PARMENSIS 2019; 89:576-580. [PMID: 30657128 PMCID: PMC6502099 DOI: 10.23750/abm.v89i4.6627] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/19/2017] [Accepted: 08/08/2018] [Indexed: 12/03/2022]
Abstract
Background: HIV-related Burkitt’s lymphoma with initial oropharyngeal presentation is rarely reported. The aim of this paper is to report the clinical findings of an unusual case of a patient with extranodal oropharyngeal Burkitt’s lymphoma as presenting disease of an unknown HIV positivity and acquired immunodeficiency syndrome. Methods: We reported the case of a hispanic patient with extranodal oropharyngeal Burkitt’s lymphoma as presenting disease of an unknown HIV positivity and acquired immunodeficiency syndrome. We describe the diagnostic work-up and treatment of this rare case of extranodal oropharyngeal Burkitt’s lymphoma. Results: Histological exam on oropharyngeal incision biopsy documented a Burkitt’s lymphoma. The patient underwent highly active antiretroviral therapy and chemotherapy. After two years of follow-up the patient shows no signs of recurrence from disease. Conclusions: HIV-related Burkitt’s lymphoma presenting with primary oropharyngeal involvement is rare, with rapidly progressing dysphagia, and does not respond to antibiotherapy. Patients should undergo incision biopsy to rule out a malignancy. In young adults, diagnosis of Burkitt’s lymphoma should suggest HIV infection. The importance of a prompt diagnosis in such cases is essential to correctly adequately staging the disease to start highly active antiretroviral therapy and chemotherapy as soon as possible. (www.actabiomedica.it)
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Affiliation(s)
- Davide Giordano
- Otolaryngology Unit, Department of Surgery, Arcispedale Santa Maria Nuova-IRCCS.
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28
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Nicholson LK, Pratap H, Bowers E, Gunzburger E, Bandi SR, Gardner EM, Palmer BE, Wright T, Kittelson J, Janoff EN. Effective B cell activation in vitro during viremic HIV-1 infection with surrogate T cell stimulation. Immunobiology 2018; 223:839-849. [PMID: 30219203 PMCID: PMC6264910 DOI: 10.1016/j.imbio.2018.08.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Revised: 08/09/2018] [Accepted: 08/19/2018] [Indexed: 02/07/2023]
Abstract
Identifying HIV-1-associated B cell defects and responses to activation may direct interventions to circumvent their impaired antibody responses to infection and vaccines. Among 34 viremic HIV-1-infected and 20 seronegative control adults, we measured baseline frequencies and activation of B and T cell subsets, expression of activation-induced cytidine deaminase (AID), potential determinants of B cell activation in vivo and B and T cell responses in vitro. At baseline, HIV-1 infection was associated with increased IgM memory and decreased anergic cell frequencies, as well as increased activation in all 10 B cell subsets compared with controls. HIV-1 status, TFH activation, and BAFF were significant potential drivers of B cell activation. Despite high baseline activation among HIV-1-infected subjects, stimulation in vitro with combined surrogates for antigen (anti-IgM), cognate (CD40 ligand) and soluble T cell factors (IL-4) elicited comparable B cell activation, transitions from naïve to class-switched memory cells and AID expression in both groups. In summary, viremic HIV-1 infection perturbs circulating B cell subsets and activation at each stage of B cell maturation. However, that appropriate stimulation of B cells elicits effective activation and maturation provides impetus for advancing vaccine development to prevent secondary infections by circumventing early B cell defects.
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Affiliation(s)
- Lindsay K Nicholson
- Mucosal and Vaccine Research Program Colorado (MAVRC), United States; Departments of Medicine, University of Colorado Denver, Aurora, CO, United States; Denver Veterans Affairs Medical Center, Denver, CO, United States
| | - Harsh Pratap
- Mucosal and Vaccine Research Program Colorado (MAVRC), United States; Departments of Medicine, University of Colorado Denver, Aurora, CO, United States; Denver Veterans Affairs Medical Center, Denver, CO, United States
| | - Elisabeth Bowers
- Mucosal and Vaccine Research Program Colorado (MAVRC), United States; Departments of Medicine, University of Colorado Denver, Aurora, CO, United States; Denver Veterans Affairs Medical Center, Denver, CO, United States
| | - Elise Gunzburger
- Departments of Biostatistics, University of Colorado Denver, Aurora, CO, United States
| | - Srinivasa R Bandi
- Mucosal and Vaccine Research Program Colorado (MAVRC), United States; Departments of Medicine, University of Colorado Denver, Aurora, CO, United States
| | - Edward M Gardner
- Departments of Medicine, University of Colorado Denver, Aurora, CO, United States; Denver Health and Hospital Authority, Denver, CO, United States
| | - Brent E Palmer
- Mucosal and Vaccine Research Program Colorado (MAVRC), United States; Departments of Medicine, University of Colorado Denver, Aurora, CO, United States
| | - Timothy Wright
- Denver Health and Hospital Authority, Denver, CO, United States
| | - John Kittelson
- Mucosal and Vaccine Research Program Colorado (MAVRC), United States; Departments of Biostatistics, University of Colorado Denver, Aurora, CO, United States
| | - Edward N Janoff
- Mucosal and Vaccine Research Program Colorado (MAVRC), United States; Departments of Medicine, University of Colorado Denver, Aurora, CO, United States; Denver Veterans Affairs Medical Center, Denver, CO, United States.
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29
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mTOR signaling mediates effects of common gamma-chain cytokines on T cell proliferation and exhaustion: implications for HIV-1 persistence and cure research. AIDS 2018; 32:2847-2851. [PMID: 30234610 DOI: 10.1097/qad.0000000000001997] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
: Chronic elevation of plasma cytokines is a key feature of HIV infection. The physiological consequences of this response to infection and its role in HIV persistence are not fully understood. Here, we show that common gamma chain (γc)-cytokines induce both proliferation and expression of T cell exhaustion markers in a mammalian target of rapamycin (mTOR)-dependent fashion, suggesting a possible therapeutic target that, if inhibited, could diminish HIV reservoir expansion, persistence, and resistance to immune surveillance.
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30
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The HIV-1 Tat protein affects human CD4+ T-cell programing and activation, and favors the differentiation of naïve CD4+ T cells. AIDS 2018; 32:575-581. [PMID: 29280760 DOI: 10.1097/qad.0000000000001734] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
OBJECTIVE HIV infection is characterized by several immune dysfunctions, such as chronic activation of the immune system, premature aging and loss of CD4 T cells, in particular within the naïve compartment. The Tat protein of HIV is released extracellularly and enters neighboring cells affecting their functionality, for instance impacting on CD8 T-cell programs and activity. As the presence and/or induction of anti-Tat immune responses is associated with reduced T-cell dysfunction and CD4 T-cell loss, we investigated whether Tat impacts human resting or activated CD4 T cells. METHODS Purified CD4 T cells were activated by T cell receptor engagement in the presence or absence of Tat. Cytokine production, surface phenotype and expression of transcription factors important for T-cell programing were measured. Purified naïve CD4 T cells were cultured in nonpolarizing conditions in the presence or absence of Tat and their proliferation and differentiation was evaluated. RESULTS Tat favors the secretion of IL2, IFNγ and TNFα in CD4 T cells, as well as the upregulation of T-bet and Eomes expression. Naïve CD4 T cells cultured in the presence of Tat showed enhanced expansion and differentiation toward memory phenotype, showing in particular recruitment into the effector memory T-cell pool. CONCLUSION Tat affects the programing and functionality of CD4 T lymphocytes favoring the differentiation of naïve CD4 T cells.
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31
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Dendritic cell immunotherapy followed by cART interruption during HIV-1 infection induces plasma protein markers of cellular immunity and neutrophil recruitment. PLoS One 2018; 13:e0192278. [PMID: 29389978 PMCID: PMC5794189 DOI: 10.1371/journal.pone.0192278] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2017] [Accepted: 01/16/2018] [Indexed: 12/18/2022] Open
Abstract
OBJECTIVES To characterize the host response to dendritic cell-based immunotherapy and subsequent combined antiretroviral therapy (cART) interruption in HIV-1-infected individuals at the plasma protein level. DESIGN An autologous dendritic cell (DC) therapeutic vaccine was administered to HIV-infected individuals, stable on cART. The effect of vaccination was evaluated at the plasma protein level during the period preceding cART interruption, during analytical therapy interruption and at viral reactivation. Healthy controls and post-exposure prophylactically treated healthy individuals were included as controls. METHODS Plasma marker ('analyte') levels including cytokines, chemokines, growth factors, and hormones were measured in trial participants and control plasma samples using a multiplex immunoassay. Analyte levels were analysed using principle component analysis, cluster analysis and limma. Blood neutrophil counts were analysed using linear regression. RESULTS Plasma analyte levels of HIV-infected individuals are markedly different from those of healthy controls and HIV-negative individuals receiving post-exposure prophylaxis. Viral reactivation following cART interruption also affects multiple analytes, but cART interruption itself only has only a minor effect. We find that Thyroxine-Binding Globulin (TBG) levels and late-stage neutrophil numbers correlate with the time off cART after DC vaccination. Furthermore, analysis shows that cART alters several regulators of blood glucose levels, including C-peptide, chromogranin-A and leptin. HIV reactivation is associated with the upregulation of CXCR3 ligands. CONCLUSIONS Chronic HIV infection leads to a change in multiple plasma analyte levels, as does virus reactivation after cART interruption. Furthermore, we find evidence for the involvement of TBG and neutrophils in the response to DC-vaccination in the setting of HIV-infection.
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32
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Sambleben C, Knudsen AD, Hartling HJ, Nielsen CH, Nielsen SD. Increased proportions of B cells with spontaneous production of interleukin-10 in HIV-infected individuals are normalized during combination antiretroviral therapy: a longitudinal study. APMIS 2017; 126:143-151. [PMID: 29271094 DOI: 10.1111/apm.12795] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2017] [Accepted: 10/19/2017] [Indexed: 12/26/2022]
Abstract
Interleukin-10 (IL-10)-producing B cells (B10 cells) may inhibit HIV-specific T cells and are elevated in untreated HIV infection. We aimed to determine the effect of combination antiretroviral treatment (cART) on the proportion of B10 cells. Furthermore, we compared B10-cell proportions in HIV-infected progressors and viremic controllers. This was a prospective study including HIV-infected progressors, viremic controllers and healthy controls. Progressors initiating cART were followed for 6 months. Purified B cells were stimulated with CpG, alone or in combination with HIV gp120, and the proportion of B10 cells was measured by flow cytometry. Without stimulation, the B10-cell proportion was higher in progressors than in healthy controls, while viremic controllers and healthy controls had comparable proportions. Moreover, the proportion of CD24hi CD38hi transitional B cells was higher in progressors than in healthy controls. After initiation of cART, the proportion of B10 cells and transitional B cells decreased. In conclusion, progressors had elevated B10-cell proportions, while viremic controllers displayed normal proportions. After initiation of cART, the B10-cell proportion decreased. This could limit B10-cell-mediated suppression of specific CD8+ T-cell responses.
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Affiliation(s)
- Camilla Sambleben
- Department of Infectious Diseases, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
| | - Andreas Dehlbaek Knudsen
- Department of Infectious Diseases, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
| | - Hans J Hartling
- Department of Infectious Diseases, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
| | - Claus H Nielsen
- Institute for Inflammation Research, Center for Rheumatology and Spine Diseases, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
| | - Susanne D Nielsen
- Department of Infectious Diseases, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
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33
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Höhne K, Businger R, van Nuffel A, Bolduan S, Koppensteiner H, Baeyens A, Vermeire J, Malatinkova E, Verhasselt B, Schindler M. Virion encapsidated HIV-1 Vpr induces NFAT to prime non-activated T cells for productive infection. Open Biol 2017; 6:rsob.160046. [PMID: 27383627 PMCID: PMC4967821 DOI: 10.1098/rsob.160046] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2016] [Accepted: 06/13/2016] [Indexed: 01/01/2023] Open
Abstract
The majority of T cells encountered by HIV-1 are non-activated and do not readily allow productive infection. HIV-1 Vpr is highly abundant in progeny virions, and induces signalling and HIV-1 LTR transcription. We hence hypothesized that Vpr might be a determinant of non-activated T-cell infection. Virion-delivered Vpr activated nuclear factor of activated T cells (NFAT) through Ca2+ influx and interference with the NFAT export kinase GSK3β. This leads to NFAT translocation and accumulation within the nucleus and was required for productive infection of unstimulated primary CD4+ T cells. A mutagenesis approach revealed correlation of Vpr-mediated NFAT activation with its ability to enhance LTR transcription and mediate cell cycle arrest. Upon NFAT inhibition, Vpr did not augment resting T-cell infection, and showed reduced G2/M arrest and LTR transactivation. Altogether, Vpr renders unstimulated T cells more permissive for productive HIV-1 infection and stimulates activation of productively infected as well as virus-exposed T cells. Therefore, it could be involved in the establishment and reactivation of HIV-1 from viral reservoirs and might have an impact on the levels of immune activation, which are determinants of HIV-1 pathogenesis.
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Affiliation(s)
- Kristin Höhne
- Institute of Virology, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany Heinrich Pette Institute, Leibniz Institute for Experimental Virology, Hamburg, Germany
| | - Ramona Businger
- Institute of Medical Virology and Epidemiology of Viral Diseases, University Hospital Tübingen, Tübingen, Germany
| | - Anouk van Nuffel
- Institute of Medical Virology and Epidemiology of Viral Diseases, University Hospital Tübingen, Tübingen, Germany
| | - Sebastian Bolduan
- Institute of Virology, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany
| | - Herwig Koppensteiner
- Institute of Virology, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany
| | - Ann Baeyens
- Department of Clinical Chemistry, Microbiology and Immunology, Ghent University, Ghent, Belgium
| | - Jolien Vermeire
- Department of Clinical Chemistry, Microbiology and Immunology, Ghent University, Ghent, Belgium
| | - Eva Malatinkova
- HIV Translational Research Unit, Department of Internal Medicine, Ghent University, Ghent, Belgium
| | - Bruno Verhasselt
- Department of Clinical Chemistry, Microbiology and Immunology, Ghent University, Ghent, Belgium
| | - Michael Schindler
- Institute of Virology, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany Heinrich Pette Institute, Leibniz Institute for Experimental Virology, Hamburg, Germany Institute of Medical Virology and Epidemiology of Viral Diseases, University Hospital Tübingen, Tübingen, Germany
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34
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Windows of opportunity for Ebola virus infection treatment and vaccination. Sci Rep 2017; 7:8975. [PMID: 28827623 PMCID: PMC5567060 DOI: 10.1038/s41598-017-08884-0] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Accepted: 07/19/2017] [Indexed: 12/23/2022] Open
Abstract
Ebola virus (EBOV) infection causes a high death toll, killing a high proportion of EBOV-infected patients within 7 days. Comprehensive data on EBOV infection are fragmented, hampering efforts in developing therapeutics and vaccines against EBOV. Under this circumstance, mathematical models become valuable resources to explore potential controlling strategies. In this paper, we employed experimental data of EBOV-infected nonhuman primates (NHPs) to construct a mathematical framework for determining windows of opportunity for treatment and vaccination. Considering a prophylactic vaccine based on recombinant vesicular stomatitis virus expressing the EBOV glycoprotein (rVSV-EBOV), vaccination could be protective if a subject is vaccinated during a period from one week to four months before infection. For the case of a therapeutic vaccine based on monoclonal antibodies (mAbs), a single dose might resolve the invasive EBOV replication even if it was administrated as late as four days after infection. Our mathematical models can be used as building blocks for evaluating therapeutic and vaccine modalities as well as for evaluating public health intervention strategies in outbreaks. Future laboratory experiments will help to validate and refine the estimates of the windows of opportunity proposed here.
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Sørensen B, Sommerfelt MA, Stjernholm G, Smith PL, Ökvist M, Hovden AO, Hoddevik G, Redfield R, Ustina V, Jelmert Ø, Zeldis J, Dalgleish A. Correlation of Antibody Responses to a Peptide Antigen gp120-C5 501-512/gp41 732-744 with HIV Disease Progression. AIDS Res Hum Retroviruses 2017; 33:558-566. [PMID: 28051320 DOI: 10.1089/aid.2016.0184] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Antibodies to the carboxy-terminal constant (C5) region 5 of the HIV-1 envelope glycoprotein gp120 have previously been associated with slow disease progression. This is one of the regions on gp120 that interact with the transmembrane glycoprotein, gp41, anchoring it to the viral and infected cell membrane. This study analyzed humoral responses to a novel heterodimeric peptide construct comprising the C5501-512 region and a compatible region on gp41732-744. Antibody levels to C5501-512/gp41732-744 were associated with slow disease progression in a treatment naive historical longitudinal cohort from Norway (n = 32; p = .00001). Elevated anti-C5501-512/gp41732-744 antibody levels correlated with moderate viral load (VL) (50-10,000 copies/ml) in a cohort, including natural viral suppressors (NVS) in the Unites States (n = 58; p = .002). Analysis of HIV-positive sera from treatment naive patients in Estonia (n = 300) showed an inverse correlation between anti-C5501-512/gp41732-744 antibodies and VL when comparing VL 2,000-10,000 copies/ml with VL >10,000 (p = .050). Further mapping using peptide inhibition of antibody binding revealed that responses to the C5501-506 subdomain correlated with preserved CD4 counts (n = 55; p = .0012) irrespective of VL in this cohort. The C5 region encompassing C5501-506 shows sequence similarity to the shared epitope (SE) of certain HLA-DR associated with immune dysfunction. Partial antigenic cross-reactivity between SE and C5 is indicated by partial inhibition of NVS antibody binding using SE 15-mer peptide (median 65% inhibition), the C5501-506 6-mer peptide (79% inhibition), and binding of rheumatoid arthritis patient sera to both SE and C5 peptide sequences. The potential influence of these observations on HIV-1 pathogenesis remains to be determined.
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Affiliation(s)
| | | | | | - Peter Lawrence Smith
- St. George's, University of London, Institute of Infection and Immunity, London, United Kingdom
| | | | | | - Gunnar Hoddevik
- Department of Virology, The Norwegian Institute of Public Health, Oslo, Norway
| | - Robert Redfield
- Department of Medicine, Institute of Human Virology, University of Maryland School of Medicine, Baltimore, Maryland
| | - Valentina Ustina
- State Reference Laboratory of HIV Diagnostics, West-Tallinn Central Hospital, Estonia
| | | | - Jerome Zeldis
- Celgene Corp./Celgene Global Health, Summit, New Jersey
| | - Angus Dalgleish
- St. George's, University of London, Institute of Infection and Immunity, London, United Kingdom
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36
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Abdelsamed HA, Moustaki A, Fan Y, Dogra P, Ghoneim HE, Zebley CC, Triplett BM, Sekaly RP, Youngblood B. Human memory CD8 T cell effector potential is epigenetically preserved during in vivo homeostasis. J Exp Med 2017; 214:1593-1606. [PMID: 28490440 PMCID: PMC5461005 DOI: 10.1084/jem.20161760] [Citation(s) in RCA: 110] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2016] [Revised: 02/16/2017] [Accepted: 04/04/2017] [Indexed: 12/15/2022] Open
Abstract
Abdelsamed et al. demonstrate that the poised effector potential of human memory CD8 T cells is coupled to maintenance of effector-associated DNA methylation programs during in vitro and in vivo homeostatic proliferation. Antigen-independent homeostasis of memory CD8 T cells is vital for sustaining long-lived T cell–mediated immunity. In this study, we report that maintenance of human memory CD8 T cell effector potential during in vitro and in vivo homeostatic proliferation is coupled to preservation of acquired DNA methylation programs. Whole-genome bisulfite sequencing of primary human naive, short-lived effector memory (TEM), and longer-lived central memory (TCM) and stem cell memory (TSCM) CD8 T cells identified effector molecules with demethylated promoters and poised for expression. Effector-loci demethylation was heritably preserved during IL-7– and IL-15–mediated in vitro cell proliferation. Conversely, cytokine-driven proliferation of TCM and TSCM memory cells resulted in phenotypic conversion into TEM cells and was coupled to increased methylation of the CCR7 and Tcf7 loci. Furthermore, haploidentical donor memory CD8 T cells undergoing in vivo proliferation in lymphodepleted recipients also maintained their effector-associated demethylated status but acquired TEM-associated programs. These data demonstrate that effector-associated epigenetic programs are preserved during cytokine-driven subset interconversion of human memory CD8 T cells.
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Affiliation(s)
- Hossam A Abdelsamed
- Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN 38105
| | - Ardiana Moustaki
- Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN 38105
| | - Yiping Fan
- Department of Computational Biology, St. Jude Children's Research Hospital, Memphis, TN 38105
| | - Pranay Dogra
- Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN 38105
| | - Hazem E Ghoneim
- Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN 38105
| | - Caitlin C Zebley
- Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN 38105.,Department of Oncology, St. Jude Children's Research Hospital, Memphis, TN 38105
| | - Brandon M Triplett
- Department of Bone Marrow Transplantation and Cellular Therapy, St. Jude Children's Research Hospital, Memphis, TN 38105
| | | | - Ben Youngblood
- Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN 38105
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37
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Linke-Serinsöz E, Fend F, Quintanilla-Martinez L. Human immunodeficiency virus (HIV) and Epstein-Barr virus (EBV) related lymphomas, pathology view point. Semin Diagn Pathol 2017; 34:352-363. [PMID: 28506687 DOI: 10.1053/j.semdp.2017.04.003] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The contribution of Epstein Barr virus (EBV) and Kaposi sarcoma herpes virus (KSHV) to the development of specific types of malignant lymphomas occurring in the human immunodeficiency virus (HIV) setting has been extensively studied since the beginning of the HIV epidemic 35 years ago. The introduction of highly active antiretroviral therapies (HAART) in 1996 has changed dramatically the incidence of HIV-related malignancies. Nevertheless, malignant lymphomas continue to be the major group of malignances observed in HIV infected individuals, and the most common cause of cancer related-deaths. Common features of the predominant B-cell lymphomas in the HIV+ setting are the frequent plasmacytoid morphology of the neoplastic cells, advanced stage, aggressive disease and frequent extranodal involvement. In this article, we review the evolving concepts and definitions of the various EBV-associated lymphomas in HIV+ patients, including diffuse large B-cell lymphoma, Burkitt lymphoma, classical Hodgkin lymphoma, plasmablastic lymphoma and primary effusion lymphoma. The current knowledge regarding the pathogenesis of these malignancies, the interplay between HIV and EBV co-infection in the development of certain HIV related lymphomas, and the emerging paradigm that suggests that HIV may play a direct role in lymphomagenesis are explored as well.
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Affiliation(s)
- Ebru Linke-Serinsöz
- Institute of Pathology, University Hospital Tübingen, Eberhard-Karls-University of Tübingen and Comprehensive Cancer Center, Tübingen, Germany
| | - Falko Fend
- Institute of Pathology, University Hospital Tübingen, Eberhard-Karls-University of Tübingen and Comprehensive Cancer Center, Tübingen, Germany
| | - Leticia Quintanilla-Martinez
- Institute of Pathology, University Hospital Tübingen, Eberhard-Karls-University of Tübingen and Comprehensive Cancer Center, Tübingen, Germany.
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38
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Saxena V, Bichare S, Singh D, Ghate M, Godbole S, Kulkarni S, Gangakhedkar R, Paranjape R, Thakar M. Short Communication: Low Immune Activation Is Associated with Higher Frequencies of Central Memory T Cell Subset in a Cohort of Indian Long-Term Nonprogressors. AIDS Res Hum Retroviruses 2017; 33:121-125. [PMID: 28034326 DOI: 10.1089/aid.2016.0210] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Persistent immune activation in human immunodeficiency virus (HIV) infection is responsible for alterations in immune system such as activation, apoptosis, and reduced frequencies. Reduced immune activation is known to be associated with virus control. Limited information is available on the influence of pan-immune activation on memory responses. Hence, we compared the T cell activation and memory profile in HIV-infected individuals exhibiting disease control such as long-term nonprogressors (LTNPs) and progressors. The activated CD4+ and CD8+ T cells were significantly lower and the CD4+ and CD8+ central memory T cell phenotypes were significantly higher in the LTNPs compared to the progressors. In addition, we observed significant inverse association between the T cell activation and frequencies of central memory T cells. Our findings indicate that patients with absence of disease progression have preserved central memory T cell population associated with lesser immune activation.
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Affiliation(s)
- Vandana Saxena
- Department of Immunology and Serology, National AIDS Research Institute, MIDC, Pune, India
| | - Shubhangi Bichare
- Department of Immunology and Serology, National AIDS Research Institute, MIDC, Pune, India
| | - Dharmendra Singh
- Department of Immunology and Serology, National AIDS Research Institute, MIDC, Pune, India
| | - Manisha Ghate
- Department of Clinical Sciences, National AIDS Research Institute, MIDC, Pune, India
| | - Sheela Godbole
- Department of Epidemiology and Biostatistics, National AIDS Research Institute, MIDC, Pune, India
| | - Smita Kulkarni
- Department of Virology, National AIDS Research Institute, MIDC, Pune, India
| | - Raman Gangakhedkar
- Department of Clinical Sciences, National AIDS Research Institute, MIDC, Pune, India
| | - Ramesh Paranjape
- Department of Immunology and Serology, National AIDS Research Institute, MIDC, Pune, India
| | - Madhuri Thakar
- Department of Immunology and Serology, National AIDS Research Institute, MIDC, Pune, India
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39
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Tanko RF, Soares AP, Müller TL, Garrett NJ, Samsunder N, Abdool Karim Q, Abdool Karim SS, Riou C, Burgers WA. Effect of Antiretroviral Therapy on the Memory and Activation Profiles of B Cells in HIV-Infected African Women. THE JOURNAL OF IMMUNOLOGY 2016; 198:1220-1228. [PMID: 28039305 DOI: 10.4049/jimmunol.1601560] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2016] [Accepted: 11/30/2016] [Indexed: 12/25/2022]
Abstract
Human immunodeficiency virus infection induces a wide range of effects in B cells, including skewed memory cell differentiation, compromised B cell function, and hypergammaglobulinemia. However, data on the extent to which these B cell abnormalities can be reversed by antiretroviral therapy (ART) are limited. To investigate the effect of ART on B cells, the activation (CD86) and differentiation (IgD, CD27, and CD38) profiles of B cells were measured longitudinally in 19 HIV-infected individuals before (median, 2 mo) and after ART initiation (median, 12 mo) and compared with 19 age-matched HIV-uninfected individuals using flow cytometry. Twelve months of ART restored the typical distribution of B cell subsets, increasing the proportion of naive B cells (CD27-IgD+CD38-) and concomitantly decreasing the immature transitional (CD27-IgD+CD38+), unswitched memory (CD27+IgD+CD38-), switched memory (CD27+IgD-CD38- or CD27-IgD-CD38-), and plasmablast (CD27+IgD-CD38high) subsets. However, B cell activation was only partially normalized post-ART, with the frequency of activated B cells (CD86+CD40+) reduced compared with pre-ART levels (p = 0.0001), but remaining significantly higher compared with HIV-uninfected individuals (p = 0.0001). Interestingly, unlike for T cell activation profiles, the extent of B cell activation prior to ART did not correlate with HIV plasma viral load, but positively associated with plasma sCD14 levels (p = 0.01, r = 0.58). Overall, ART partially normalizes the skewed B cell profiles induced by HIV, with some activation persisting. Understanding the effects of HIV on B cell dysfunction and restoration following ART may provide important insights into the mechanisms of HIV pathogenesis.
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Affiliation(s)
- Ramla F Tanko
- Department of Pathology, Division of Medical Virology, Faculty of Health Sciences, University of Cape Town, Cape Town 7925, South Africa
| | - Andreia P Soares
- Department of Pathology, Division of Medical Virology, Faculty of Health Sciences, University of Cape Town, Cape Town 7925, South Africa
| | - Tracey L Müller
- Department of Pathology, Division of Medical Virology, Faculty of Health Sciences, University of Cape Town, Cape Town 7925, South Africa
| | - Nigel J Garrett
- Centre for the AIDS Program of Research in South Africa, University of KwaZulu-Natal, Durban 4013, South Africa
| | - Natasha Samsunder
- Centre for the AIDS Program of Research in South Africa, University of KwaZulu-Natal, Durban 4013, South Africa
| | - Quarraisha Abdool Karim
- Centre for the AIDS Program of Research in South Africa, University of KwaZulu-Natal, Durban 4013, South Africa.,Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, NY 10032; and
| | - Salim S Abdool Karim
- Centre for the AIDS Program of Research in South Africa, University of KwaZulu-Natal, Durban 4013, South Africa.,Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, NY 10032; and
| | - Catherine Riou
- Department of Pathology, Division of Medical Virology, Faculty of Health Sciences, University of Cape Town, Cape Town 7925, South Africa.,Institute of Infectious Disease and Molecular Medicine, University of Cape Town, Cape Town 7925, South Africa
| | - Wendy A Burgers
- Department of Pathology, Division of Medical Virology, Faculty of Health Sciences, University of Cape Town, Cape Town 7925, South Africa; .,Institute of Infectious Disease and Molecular Medicine, University of Cape Town, Cape Town 7925, South Africa
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40
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Abstract
It is more than 50 years since the Epstein-Barr virus (EBV), the first human tumour virus, was discovered. EBV has subsequently been found to be associated with a diverse range of tumours of both lymphoid and epithelial origin. Progress in the molecular analysis of EBV has revealed fundamental mechanisms of more general relevance to the oncogenic process. This Timeline article highlights key milestones in the 50-year history of EBV and discusses how this virus provides a paradigm for exploiting insights at the molecular level in the diagnosis, treatment and prevention of cancer.
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Affiliation(s)
- Lawrence S Young
- Warwick Medical School, The University of Warwick, Coventry CV4 7AL, UK
| | - Lee Fah Yap
- Department of Oral and Craniofacial Sciences and Oral Cancer Research Coordinating Centre, Faculty of Dentistry, University of Malaya, Kuala Lumpur, Malaysia
| | - Paul G Murray
- Institute of Cancer and Genomic Medicine, University of Birmingham, Vincent Drive, Edgbaston, Birmingham B15 2TT, UK
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41
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Korolevskaya LB, Shmagel KV, Saidakova EV, Shmagel NG, Chereshnev VA. Immune complexes that contain HIV antigens activate peripheral blood T cells. DOKLADY BIOLOGICAL SCIENCES : PROCEEDINGS OF THE ACADEMY OF SCIENCES OF THE USSR, BIOLOGICAL SCIENCES SECTIONS 2016; 469:196-8. [PMID: 27595830 DOI: 10.1134/s0012496616040062] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2016] [Indexed: 11/22/2022]
Abstract
Uninfected donor T cells were treated in vitro by model immune complexes that contained either HIV or hepatitis C virus (HCV) antigens. Unlike HCV antigen-containing complexes, the immune complexes that contained HIV antigens have been shown to activate peripheral blood T cells of uninfected donors under in vitro conditions. Both the antiviral antibodies and HIV antigen were involved in the activation process. The unique properties of the immune complexes formed by HIV antigens and antiviral antibodies are believed to result from the virus-specific antibody properties and molecular conformation of the antigen-antibody complex.
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Affiliation(s)
- L B Korolevskaya
- Institute of Ecology and Genetics of Microorganisms, Ural Division, Russian Academy of Sciences, Perm, Russia. .,Perm State National Research University, Perm, Russia.
| | - K V Shmagel
- Institute of Ecology and Genetics of Microorganisms, Ural Division, Russian Academy of Sciences, Perm, Russia.,Perm State National Research University, Perm, Russia
| | - E V Saidakova
- Institute of Ecology and Genetics of Microorganisms, Ural Division, Russian Academy of Sciences, Perm, Russia.,Perm State National Research University, Perm, Russia
| | - N G Shmagel
- Perm State National Research University, Perm, Russia.,Perm AIDS Center, Perm, Russia
| | - V A Chereshnev
- Perm State National Research University, Perm, Russia.,Institute of Immunology and Physiology, Ural Dividion, Russian Academy of Sciences, Yekaterinburg, Russia
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42
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Morquin D, Tuaillon E, Makinson A, Bendriss S, Le Moing V, Reynes J. Impact of T cell activation, HIV replication and hepatitis C virus infection on neutrophil CD64 expression. CYTOMETRY PART B-CLINICAL CYTOMETRY 2016; 92:492-497. [PMID: 27221825 DOI: 10.1002/cyto.b.21385] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2016] [Revised: 04/29/2016] [Accepted: 05/23/2016] [Indexed: 11/10/2022]
Abstract
BACKGROUND Overexpression of the Fc receptor CD64 on neutrophils is associated with innate immune response and bacterial infections. During HIV infection a large set of immune disorders including T-lymphocyte over-activation, microbial translocation, impairment of neutrophil functions, and immunodeficiency may interplay with neutrophil CD64 expression. METHODS Associations of neutrophil CD64 expression with CD8+ T cell activation, CD4+ T cells number, HIV, and HCV replications were investigated in HIV infected patients using a standardized method. RESULTS Higher neutrophil CD64 expression was observed in HIV infected subjects compared to healthy controls (0.91 vs. 0.75, P < 0.001). Among 115 HIV infected patients, nine (8.8%) had a CD64 expression over the clinical threshold as calculated against bead standard (i.e., 1.5). HIV viremic patients were more likely to have an index above 1.5 (OR: 6.68, P values: 0.01). A trend for correlation between CD64 expression and CD8 T cell activation was observed (P values: 0.08). Blood CD4+ T lymphocyte depletion and HCV replication did not affect neutrophil CD64 expression. CONCLUSIONS HIV infection and HIV replication are associated with up-regulation of neutrophil CD64. CD64 overexpression above the clinical threshold was observed in a minor proportion of HIV infected individuals treated by antiretroviral therapy and may be a marker of neutrophil activation related to non-AIDS-linked comorbidities. © 2016 International Clinical Cytometry Society.
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Affiliation(s)
- D Morquin
- Infectious and Tropical Diseases Department, UMI 233, Gui De Chauliac, University Hospital of Montpellier, Montpellier, France
| | - E Tuaillon
- Infectious and Tropical Diseases Department, UMI 233, Gui De Chauliac, University Hospital of Montpellier, Montpellier, France.,Department of Microbiology, Université Montpellier 1/Inserm UMR 1058, Lapeyronie, University Hospital of Montpellier, Montpellier, France
| | - A Makinson
- Infectious and Tropical Diseases Department, UMI 233, Gui De Chauliac, University Hospital of Montpellier, Montpellier, France
| | - S Bendriss
- Department of Microbiology, Université Montpellier 1/Inserm UMR 1058, Lapeyronie, University Hospital of Montpellier, Montpellier, France
| | - V Le Moing
- Infectious and Tropical Diseases Department, UMI 233, Gui De Chauliac, University Hospital of Montpellier, Montpellier, France
| | - J Reynes
- Infectious and Tropical Diseases Department, UMI 233, Gui De Chauliac, University Hospital of Montpellier, Montpellier, France
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43
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Boron Induces Lymphocyte Proliferation and Modulates the Priming Effects of Lipopolysaccharide on Macrophages. PLoS One 2016; 11:e0150607. [PMID: 26934748 PMCID: PMC4774930 DOI: 10.1371/journal.pone.0150607] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2015] [Accepted: 02/17/2016] [Indexed: 12/26/2022] Open
Abstract
Chemical mediators of inflammation (CMI) are important in host defense against infection. The reduced capacity of host to induce the secretion of these mediators following infection is one of the factors in host susceptibility to infection. Boron, which has been suggested for its role in infection, is reported in this study to increase lymphocyte proliferation and the secretion of CMI by the lipopolysaccharide (LPS)-stimulated peritoneal macrophages in BALB/c mice. Boron was administered to mice orally as borax at different doses for 10 consecutive days, followed by the stimulation of animals with ovalbumin and isolation of splenocytes for proliferation assay. The lymphocyte subsets were determined by flow cytometry in spleen cell suspension. The mediators of inflammation, TNF-α, IL-6, IL-1β and nitric oxide (NO), were measured in culture supernatant of LPS-primed macrophages isolated from borax treated mice. TNF and ILs were measured by ELISA. NO was determined by Griess test. The expression of inducible nitric oxide synthase (iNOS) in macrophages was studied by confocal microscopy. Results showed a significant increase in T and B cell populations, as indicated by an increase in CD4 and CD19, but not CD8, cells. Boron further stimulated the secretion of TNF-α, IL-6, IL-1β, NO and the expression of iNOS by the LPS-primed macrophages. The effect was dose dependent and most significant at a dose level of 4.6 mg/kg b. wt. Taken together, the study concludes that boron at physiological concentration induces lymphocyte proliferation and increases the synthesis and secretion of pro-inflammatory mediators by the LPS-primed macrophages, more specifically the M1 macrophages, possibly acting through Toll-like receptor. The study implicates boron as a regulator of the immune and inflammatory reactions and macrophage polarization, thus playing an important role in augmenting host defense against infection, with possible role in cancer and other diseases.
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44
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Korolevskaya LB, Shmagel KV, Shmagel NG, Saidakova EV. Systemic activation of the immune system in HIV infection: The role of the immune complexes (hypothesis). Med Hypotheses 2016; 88:53-6. [PMID: 26880638 DOI: 10.1016/j.mehy.2016.01.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2015] [Accepted: 01/19/2016] [Indexed: 02/05/2023]
Abstract
Currently, immune activation is proven to be the basis for the HIV infection pathogenesis and a strong predictor of the disease progression. Among the causes of systemic immune activation the virus and its products, related infectious agents, pro-inflammatory cytokines, and regulatory CD4+ T cells' decrease are considered. Recently microbial translocation (bacterial products yield into the bloodstream as a result of the gastrointestinal tract mucosal barrier integrity damage) became the most popular hypothesis. Previously, we have found an association between immune complexes present in the bloodstream of HIV infected patients and the T cell activation. On this basis, we propose a significantly modified hypothesis of immune activation in HIV infection. It is based on the immune complexes' participation in the immunocompetent cells' activation. Immune complexes are continuously formed in the chronic phase of the infection. Together with TLR-ligands (viral antigens, bacterial products coming from the damaged gut) present in the bloodstream they interact with macrophages. As a result macrophages are transformed into the type II activated forms. These macrophages block IL-12 production and start synthesizing IL-10. High level of this cytokine slows down the development of the full-scale Th1-response. The anti-viral reactions are shifted towards the serogenesis. Newly synthesized antibodies' binding to viral antigens leads to continuous formation of the immune complexes capable of interacting with antigen-presenting cells.
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Affiliation(s)
- Larisa B Korolevskaya
- Institute of Ecology and Genetics of Microorganisms UB RAS, Perm, Russia; Perm State University, Perm, Russia.
| | - Konstantin V Shmagel
- Institute of Ecology and Genetics of Microorganisms UB RAS, Perm, Russia; Perm State University, Perm, Russia
| | - Nadezhda G Shmagel
- Perm Regional Centre for Protection against AIDS and Infectious Diseases, Perm, Russia; Perm State University, Perm, Russia
| | - Evgeniya V Saidakova
- Institute of Ecology and Genetics of Microorganisms UB RAS, Perm, Russia; Perm State University, Perm, Russia
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45
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Timilsina U, Gaur R. Modulation of apoptosis and viral latency - an axis to be well understood for successful cure of human immunodeficiency virus. J Gen Virol 2016; 97:813-824. [PMID: 26764023 DOI: 10.1099/jgv.0.000402] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Human immunodeficiency virus (HIV) is the causative agent of the deadly disease AIDS, which is characterized by the progressive decline of CD4(+)T-cells. HIV-1-encoded proteins such as envelope gp120 (glycoprotein gp120), Tat (trans-activator of transcription), Nef (negative regulatory factor), Vpr (viral protein R), Vpu (viral protein unique) and protease are known to be effective in modulating host cell signalling pathways that lead to an alteration in apoptosis of both HIV-infected and uninfected bystander cells. Depending on the stage of the virus life cycle and host cell type, these viral proteins act as mediators of pro- or anti-apoptotic signals. HIV latency in viral reservoirs is a persistent phenomenon that has remained beyond the control of the human immune system. To cure HIV infections completely, it is crucial to reactivate latent HIV from cellular pools and to drive these apoptosis-resistant cells towards death. Several previous studies have reported the role of HIV-encoded proteins in apoptosis modulation, but the molecular basis for apoptosis evasion of some chronically HIV-infected cells and reactivated latently HIV-infected cells still needs to be elucidated. The current review summarizes our present understanding of apoptosis modulation in HIV-infected cells, uninfected bystander cells and latently infected cells, with a focus on highlighting strategies to activate the apoptotic pathway to kill latently infected cells.
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Affiliation(s)
- Uddhav Timilsina
- Faculty of Life Sciences and Biotechnology, South Asian University, New Delhi- 110021, India
| | - Ritu Gaur
- Faculty of Life Sciences and Biotechnology, South Asian University, New Delhi- 110021, India
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Stepwise B-cell-dependent expansion of T helper clonotypes diversifies the T-cell response. Nat Commun 2016; 7:10281. [PMID: 26728651 PMCID: PMC4728444 DOI: 10.1038/ncomms10281] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2015] [Accepted: 11/24/2015] [Indexed: 01/07/2023] Open
Abstract
Antigen receptor diversity underpins adaptive immunity by providing the ground for clonal selection of lymphocytes with the appropriate antigen reactivity. Current models attribute T cell clonal selection during the immune response to T-cell receptor (TCR) affinity for either foreign or self peptides. Here, we report that clonal selection of CD4(+) T cells is also extrinsically regulated by B cells. In response to viral infection, the antigen-specific TCR repertoire is progressively diversified by staggered clonotypic expansion, according to functional avidity, which correlates with self-reactivity. Clonal expansion of lower-avidity T-cell clonotypes depends on availability of MHC II-expressing B cells, in turn influenced by B-cell activation. B cells clonotypically diversify the CD4(+) T-cell response also to vaccination or tumour challenge, revealing a common effect.
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Zimmermann K, Bastidas S, Knecht L, Kuster H, Vavricka SR, Günthard HF, Oxenius A. Gut commensal microbes do not represent a dominant antigenic source for continuous CD4+ T-cell activation during HIV-1 infection. Eur J Immunol 2015; 45:3107-13. [PMID: 26345361 DOI: 10.1002/eji.201545940] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2015] [Revised: 08/20/2015] [Accepted: 09/08/2015] [Indexed: 11/06/2022]
Abstract
Chronic immune activation is a hallmark of HIV-1 infection; specifically, the activation of T cells has predictive value for progression to AIDS. The majority of hyperactivated T cells are not HIV-specific and their antigenic specificities remain poorly understood. Translocation of gut luminal microbial products to systemic sites contributes to chronic immune activation during HIV-1 infection, but how it affects (TCR-dependent) immune activation remains elusive. We hypothesized that gut luminal antigens foster activation of CD4(+) T cells with specificities for commensal bacterial antigens, thereby contributing to the pool of activated CD4(+) T cells in the circulation of HIV-1 infected individuals. To test this hypothesis, we quantified the frequencies of gut microbe-specific CD4(+) T cells by cytokine production upon restimulation with selected gut commensal microbial antigens. Contrary to our hypothesis, we did not observe increased but rather decreased frequencies of gut microbe-specific CD4(+) T cells in HIV-1 infected individuals compared to healthy controls. We conclude that the increased activation status of circulating CD4(+) T cells in HIV-1 infected individuals is not driven by CD4(+) T cells with specificities for commensal bacterial antigens.
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Affiliation(s)
| | - Sonia Bastidas
- Institute of Microbiology, ETH Zurich, Zurich, Switzerland
| | - Leandra Knecht
- Institute of Microbiology, ETH Zurich, Zurich, Switzerland
| | - Herbert Kuster
- Division of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Stephan R Vavricka
- Division of Gastroenterology and Hepatology, Triemli Hospital, Zurich, Switzerland
| | - Huldrych F Günthard
- Division of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland.,Institute of Medical Virology, University of Zurich, Zurich, Switzerland
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48
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Abstract
In chronic infections and cancer, T cells are exposed to persistent antigen and/or inflammatory signals. This scenario is often associated with the deterioration of T cell function: a state called 'exhaustion'. Exhausted T cells lose robust effector functions, express multiple inhibitory receptors and are defined by an altered transcriptional programme. T cell exhaustion is often associated with inefficient control of persisting infections and tumours, but revitalization of exhausted T cells can reinvigorate immunity. Here, we review recent advances that provide a clearer molecular understanding of T cell exhaustion and reveal new therapeutic targets for persisting infections and cancer.
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Affiliation(s)
- E John Wherry
- Department of Microbiology and Institute for Immunology, University of Pennsylvania Perelman School Medicine, Philadelphia, Pennsylvania 19104, USA
| | - Makoto Kurachi
- Department of Microbiology and Institute for Immunology, University of Pennsylvania Perelman School Medicine, Philadelphia, Pennsylvania 19104, USA
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Martini H, Citro A, Martire C, D'Ettorre G, Labbadia G, Accapezzato D, Piconese S, De Marzio P, Cavallari EN, Calvo L, Rizzo F, Severa M, Coccia EM, Grazi GL, Di Filippo S, Sidney J, Vullo V, Sette A, Barnaba V. Apoptotic Epitope-Specific CD8+ T Cells and Interferon Signaling Intersect in Chronic Hepatitis C Virus Infection. J Infect Dis 2015; 213:674-83. [PMID: 26386427 DOI: 10.1093/infdis/jiv460] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2015] [Accepted: 09/10/2015] [Indexed: 12/21/2022] Open
Abstract
CD8(+) T cells specific to caspase-cleaved antigens derived from apoptotic T cells represent a principal player in chronic immune activation. Here, we found that both apoptotic epitope-specific and hepatitis C virus (HCV)-specific CD8(+) T cells were mostly confined within the effector memory (EM) or terminally differentiated EM CD45RA(+) cell subsets expressing a dysfunctional T-helper 1-like signature program in chronic HCV infection. However, apoptotic epitope-specific CD8(+) T cells produced tumor necrosis factor α and interleukin 2 at the intrahepatic level significantly more than HCV-specific CD8(+) T cells, despite both populations expressing high levels of programmed death 1 receptor. Contextually, only apoptotic epitope-specific CD8(+) T cells correlated with both interferon-stimulated gene levels in T cells and hepatic fibrosis score. Together, these data suggest that, compared with HCV-specific CD8(+) T cells, apoptotic epitope-specific CD8(+) T cells can better sustain chronic immune activation, owing to their capacity to produce tumor necrosis factor α, and exhibit greater resistance to inhibitory signals during chronic HCV infection.
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Affiliation(s)
| | | | | | - Gabriella D'Ettorre
- Dipartimento di Sanità Pubblica e Malattie Infettive, Sapienza Università di Roma
| | | | | | | | | | - Eugenio N Cavallari
- Dipartimento di Sanità Pubblica e Malattie Infettive, Sapienza Università di Roma
| | | | - Fabiana Rizzo
- Dipartimento di Malattie Infettive, Parassitarie e Immunomediate, Istituto Superiore di Sanità
| | - Martina Severa
- Dipartimento di Malattie Infettive, Parassitarie e Immunomediate, Istituto Superiore di Sanità
| | - Eliana M Coccia
- Dipartimento di Malattie Infettive, Parassitarie e Immunomediate, Istituto Superiore di Sanità
| | - Gian Luca Grazi
- Chirurgia Epato-bilio-pancreatica, Istituto Nazionale dei Tumori Regina Elena
| | - Simona Di Filippo
- Chirurgia Epato-bilio-pancreatica, Istituto Nazionale dei Tumori Regina Elena
| | - John Sidney
- La Jolla Institute for Allergy and Immunology, San Diego, California
| | - Vincenzo Vullo
- Dipartimento di Sanità Pubblica e Malattie Infettive, Sapienza Università di Roma
| | - Alessandro Sette
- La Jolla Institute for Allergy and Immunology, San Diego, California
| | - Vincenzo Barnaba
- Dipartimento di Medicina Interna e Specialità Mediche Istituto Pasteur-Fondazione Cenci Bolognetti, Rome, Italy
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50
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Molecular and cellular insights into T cell exhaustion. NATURE REVIEWS. IMMUNOLOGY 2015. [PMID: 26205583 DOI: 10.1038/nri3862.] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
In chronic infections and cancer, T cells are exposed to persistent antigen and/or inflammatory signals. This scenario is often associated with the deterioration of T cell function: a state called 'exhaustion'. Exhausted T cells lose robust effector functions, express multiple inhibitory receptors and are defined by an altered transcriptional programme. T cell exhaustion is often associated with inefficient control of persisting infections and tumours, but revitalization of exhausted T cells can reinvigorate immunity. Here, we review recent advances that provide a clearer molecular understanding of T cell exhaustion and reveal new therapeutic targets for persisting infections and cancer.
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