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Perrone C, Bozzano F, Dal Bello MG, Del Zotto G, Antonini F, Munari E, Maggi E, Moretta F, Farshchi AH, Pariscenti G, Tagliamento M, Genova C, Moretta L, De Maria A. CD34 +DNAM-1 brightCXCR4 + haemopoietic precursors circulate after chemotherapy, seed lung tissue and generate functional innate-like T cells and NK cells. Front Immunol 2024; 15:1332781. [PMID: 38390333 PMCID: PMC10881815 DOI: 10.3389/fimmu.2024.1332781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2023] [Accepted: 01/17/2024] [Indexed: 02/24/2024] Open
Abstract
Background There is little information on the trajectory and developmental fate of Lin-CD34+DNAM-1bright CXCR4+ progenitors exiting bone marrow during systemic inflammation. Objective To study Lin-CD34+DNAM-1bright CXCR4+ cell circulation in cancer patients, to characterize their entry into involved lung tissue and to characterize their progenies. Methods Flow cytometric analysis of PBMC from 18 patients with lung cancer on samples collected immediately before the first and the second treatment was performed to study Lin-CD34+DNAM-1bright CXCR4+ precursors. Precursors were purified (>99%) and cultured in vitro from all patients. Paired PBMC and tissue samples from patients undergoing tumor resection were analyzed by flow cytometry to assess tissue entry and compare phenotype and developmental potential of Lin-CD34+DNAM-1bright CXCR4+ cells in both compartments. Results Significant circulation of Lin-CD34+DNAM-1bright CXCR4+ precursors was observed 20d after the first treatment. Precursors express CXC3CR1, CXCR3, CXCR1 consistent with travel towards inflamed tissues. Flowcytometric analysis of lung tissue samples showed precursor presence in all patients in tumor and neighboring uninvolved areas. Successful purification and in vitro culture from both blood and lung tissue generates a minor proportion of maturing NK cells (<10%) and a predominant proportion (>85%) of α/β T-progenies with innate-like phenotype expressing NKG2D,NKp30,DNAM-1. Innate-like maturing T-cells in vitro are cytotoxic, can be triggered via NKR/TCR co-stimulation and display broad spectrum Th1,Th2 and Th1/Th17 cytokine production. Conclusion In advanced stage lung cancer CD34+DNAM-1brightCXCR4+ inflammatory precursors increase upon treatment, enter involved tissues, generate functional progenies and may thus represent an additional player contributing to immune balance in the highly SDF-1/CXCR4-biased pro-metastatic tumor microenvironment.
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Affiliation(s)
- Carola Perrone
- Experimental Immunology Unit, IRCCS Ospedale Policlinico San Martino, Genova, Italy
| | - Federica Bozzano
- Laboratorio Diagnostico di Autoimmunologia, IRCCS Ospedale Policlinico San Martino, Genova, Italy
| | | | - Genny Del Zotto
- Integrated Department of Services and Laboratories, IRCCS Istituto Giannina Gaslini, Genova, Italy
| | - Francesca Antonini
- Integrated Department of Services and Laboratories, IRCCS Istituto Giannina Gaslini, Genova, Italy
| | - Enrico Munari
- Pathology Unit, Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy
| | - Enrico Maggi
- Tumor Immunology Unit, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - Francesca Moretta
- Department of Laboratory Medicine, Istituto di Ricovero e Cura a Carattere Scientifico Sacro Cuore Don Calabria Hospital, Negrar, Verona, Italy
| | | | - Gianluca Pariscenti
- Thoracic Surgery Unit, IRCCS Ospedale Policlinico San Martino, Genova, Italy
| | - Marco Tagliamento
- Lung Cancer Unit, IRCCS Ospedale Policlinico San Martino, Genova, Italy
- Department of Internal Medicine and Medical Specialties (DiMI), University of Genova, Genova, Italy
| | - Carlo Genova
- Lung Cancer Unit, IRCCS Ospedale Policlinico San Martino, Genova, Italy
- Department of Internal Medicine and Medical Specialties (DiMI), University of Genova, Genova, Italy
| | - Lorenzo Moretta
- Tumor Immunology Unit, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - Andrea De Maria
- Department of Health Sciences, University of Genova, Genova, Italy
- Infections of Immunocompromised Hosts Unit, Division of Infectious Diseases, IRCCS Ospedale Policlinico San Martino, Genova, Italy
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Della Chiesa M, De Maria A, Muccio L, Bozzano F, Sivori S, Moretta L. Human NK Cells and Herpesviruses: Mechanisms of Recognition, Response and Adaptation. Front Microbiol 2019; 10:2297. [PMID: 31636622 PMCID: PMC6788305 DOI: 10.3389/fmicb.2019.02297] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2019] [Accepted: 09/20/2019] [Indexed: 12/01/2022] Open
Abstract
NK cells contribute to early defenses against viruses through their inborn abilities that include sensing of PAMPs and inflammatory signals such as cytokines or chemokines, recognition, and killing of infected cells through activating surface receptors engagement. Moreover, they support adaptive responses via Ab-dependent mechanisms, triggered by CD16, and DC editing. Their fundamental role in anti-viral responses has been unveiled in patients with NK cell deficiencies suffering from severe Herpesvirus infections. Notably, these infections, often occurring as primary infections early in life, can be efficiently cleared by NK, T, and B cells in healthy hosts. Herpesviruses however, generate a complicated balance with the host immune system through their latency cycle moving between immune control and viral reactivation. This lifelong challenge has contributed to the development of numerous evasion mechanisms by Herpesviruses, many of which devoted to elude NK cell surveillance from viral reactivations rather than primary infections. This delicate equilibrium can be altered in proportions of healthy individuals promoting virus reactivation and, more often, in immunocompromised subjects. However, the constant stimulus provided by virus-host interplay has also favored NK-cell adaptation to Herpesviruses. During anti-HCMV responses, NK cells can reshape their receptor repertoire and function, through epigenetic remodeling, and acquire adaptive traits such as longevity and clonal expansion abilities. The major mechanisms of recognition and effector responses employed by NK cells against Herpesviruses, related to their genomic organization will be addressed, including those allowing NK cells to generate memory-like responses. In addition, the mechanisms underlying virus reactivation or control will be discussed.
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Affiliation(s)
- Mariella Della Chiesa
- Department of Experimental Medicine (DIMES), School of Medical and Pharmaceutical Sciences, University of Genoa, Genoa, Italy.,Centre of Excellence for Biomedical Research, University of Genoa, Genoa, Italy
| | - Andrea De Maria
- Centre of Excellence for Biomedical Research, University of Genoa, Genoa, Italy.,Department of Health Sciences (DISSAL), School of Medical and Pharmaceutical Sciences University of Genoa, Genoa, Italy.,Clinica Malattie Infettive, Ospedale Policlinico San Martino IRCCS, Genoa, Italy
| | - Letizia Muccio
- Department of Experimental Medicine (DIMES), School of Medical and Pharmaceutical Sciences, University of Genoa, Genoa, Italy
| | - Federica Bozzano
- Laboratory of Tumor Immunology, Department of Immunology, IRCCS Ospedale Bambino Gesù, Rome, Italy
| | - Simona Sivori
- Department of Experimental Medicine (DIMES), School of Medical and Pharmaceutical Sciences, University of Genoa, Genoa, Italy.,Centre of Excellence for Biomedical Research, University of Genoa, Genoa, Italy
| | - Lorenzo Moretta
- Laboratory of Tumor Immunology, Department of Immunology, IRCCS Ospedale Bambino Gesù, Rome, Italy
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Bozzano F, Perrone C, Moretta L, De Maria A. NK Cell Precursors in Human Bone Marrow in Health and Inflammation. Front Immunol 2019; 10:2045. [PMID: 31555276 PMCID: PMC6724745 DOI: 10.3389/fimmu.2019.02045] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Accepted: 08/13/2019] [Indexed: 12/22/2022] Open
Abstract
NK cells are generated from hematopoietic stem cells (HSC) residing in the bone marrow (BM), similar to other blood cells. Development toward mature NK cells occurs largely outside the BM through travel of CD34+ and other progenitor intermediates toward secondary lymphoid organs. The BM harbors multipotent CD34+ common lymphoid progenitors (CLPs) that generate T, B, NK, and Dendritic Cells and are devoid of erythroid, myeloid, and megakaryocytic potential. Over recent years, there has been a quest for single-lineage progenitors predominantly with the objective of manipulation and intervention in mind, which has led to the identification of unipotent NK cell progenitors devoid of other lymphoid lineage potential. Research efforts for the study of lymphopoiesis have almost exclusively concentrated on healthy donor tissues and on repopulation/transplant models. This has led to the widely accepted assumption that lymphopoiesis during disease states reflects the findings of these models. However, compelling evidences in animal models show that inflammation plays a fundamental role in the regulation of HSC maturation and release in the BM niches through several mechanisms including modulation of the CXCL12-CXCR4 expression. Indeed, recent findings during systemic inflammation in patients provide evidence that a so-far overlooked CLP exists in the BM (Lin−CD34+DNAM-1brightCXCR4+) and that it overwhelmingly exits the BM during systemic inflammation. These “inflammatory” precursors have a developmental trajectory toward surprisingly functional NK and T cells as reviewed here and mirror the steady state maintenance of the NK cell pool by CD34+DNAM-1−CXCR4− precursors. Our understanding of NK cell precursor development may benefit from including a distinct “inflammatory” progenitor modeling of lymphoid precursors, allowing rapid deployment of specialized Lin−CD34+DNAM-1brightCXCR4+ -derived resources from the BM.
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Affiliation(s)
| | - Carola Perrone
- Centro di Eccellenza per la Ricerca Biomedica, Università di Genova, Genoa, Italy
| | | | - Andrea De Maria
- Centro di Eccellenza per la Ricerca Biomedica, Università di Genova, Genoa, Italy.,Clinica Malattie Infettive, Ospedale Policlinico S. Martino IRCCS, Genoa, Italy.,Dipartimento di Scienze Dell Salute, Università Degli Studi di Genova, Genoa, Italy
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Bozzano F, Marras F, De Maria A. Natural Killer Cell Development and Maturation Revisited: Possible Implications of a Novel Distinct Lin -CD34 +DNAM-1 brightCXCR4 + Cell Progenitor. Front Immunol 2017; 8:268. [PMID: 28337208 PMCID: PMC5343008 DOI: 10.3389/fimmu.2017.00268] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Accepted: 02/23/2017] [Indexed: 01/23/2023] Open
Abstract
Since the first description of natural killer (NK) cells, the view on their role in innate immunity has evolved considerably. In addition to first-line defense against transformed and pathogen-infected autologous cells, NK cells contribute to modulate adaptive immune responses and in some cases acquire specialized functions, including exhausted, adaptive, and decidual NK cells. NK cells derive from CD34+ progenitors, in vivo and in vitro; however, it is unclear whether the high phenotype diversity in vivo may be generated from these precursors alone. The recent characterization of a novel CD34+DNAM-1brightCXCR4+ precursor giving rise to apparently licensed and functional maturing NK cells may suggest the possibility for a higher than expected common lymphocyte precursor diversity and a consequently higher peripheral NK cell phenotype variability. Here, we review the evidences on NK cell central and peripheral development from CD34+ precursors and propose a possible updated reading frame based on the characterization of CD34+DNAM-1brightCXCR4+ cell progenies, which favors the possibility of concurrent NK cell maturation from different CD34+ precursors.
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Affiliation(s)
- Federica Bozzano
- Department of Experimental Medicine (DIMES), University of Genova, Genova, Italy; Center of Excellence for Biomedical Research (CEBR), University of Genova, Genova, Italy
| | | | - Andrea De Maria
- Center of Excellence for Biomedical Research (CEBR), University of Genova, Genova, Italy; Clinica Malattie Infettive, IRCCS AOU San Martino-IST Genova, Istituto Nazionale per la Ricerca sul Cancro, Genova, Italy; Department of Health Sciences, DISSAL, University of Genova, Genova, Italy
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5
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Bozzano F, Marras F, Ascierto ML, Cantoni C, Cenderello G, Dentone C, Di Biagio A, Orofino G, Mantia E, Boni S, De Leo P, Picciotto A, Braido F, Antonini F, Wang E, Marincola F, Moretta L, De Maria A. 'Emergency exit' of bone-marrow-resident CD34(+)DNAM-1(bright)CXCR4(+)-committed lymphoid precursors during chronic infection and inflammation. Nat Commun 2015; 6:8109. [PMID: 26436997 PMCID: PMC4600731 DOI: 10.1038/ncomms9109] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2014] [Accepted: 07/20/2015] [Indexed: 02/07/2023] Open
Abstract
During chronic inflammatory disorders, a persistent natural killer (NK) cell derangement is observed. While increased cell turnover is expected, little is known about whether and how NK-cell homeostatic balance is maintained. Here, flow cytometric analysis of peripheral blood mononuclear cells in chronic inflammatory disorders, both infectious and non-infectious, reveals the presence of a CD34(+)CD226(DNAM-1)(bright)CXCR4(+) cell population displaying transcriptional signatures typical of common lymphocyte precursors and giving rise to NK-cell progenies with high expression of activating receptors and mature function and even to α/β T lymphocytes. CD34(+)CD226(bright)CXCR4(+) cells reside in bone marrow, hardly circulate in healthy donors and are absent in cord blood. Their proportion correlates with the degree of inflammation, reflecting lymphoid cell turnover/reconstitution during chronic inflammation. These findings provide insight on intermediate stages of NK-cell development, a view of emergency recruitment of cell precursors, and upgrade our understanding and monitoring of chronic inflammatory conditions.
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Affiliation(s)
- Federica Bozzano
- Department of Experimental Medicine, University of Genova, Via Pastore 1, Genova 16132, Italy.,Center for Excellence in Biomedical Research, University of Genova, Via Pastore 1, Genova 16132, Italy
| | | | - Maria Libera Ascierto
- Department of Transfusion Medicine, Clinical Center and Center of Human Immunology, National Institutes of Health, Bethesda, Maryland 20892, USA.,Department of Oncology, Johns Hopkins University, Baltimore, Maryland 21231, USA
| | - Claudia Cantoni
- Department of Experimental Medicine, University of Genova, Via Pastore 1, Genova 16132, Italy.,Center for Excellence in Biomedical Research, University of Genova, Via Pastore 1, Genova 16132, Italy.,Istituto Giannina Gaslini, Genova 16148, Italy
| | - Giovanni Cenderello
- U.O.C. Malattie Infettive, Ospedale Galliera, Mura delle Cappuccine 14, Genova 16128, Italy
| | - Chiara Dentone
- U.O.C. Malattie Infettive, Ospedale Sanremo, Via Privata Barabino 15, Sanremo 18038, Italy
| | - Antonio Di Biagio
- Clinica Malattie Infettive, IRCCS AOU San Martino-IST Genova, Istituto Nazionale per la Ricerca sul Cancro, Largo Rosanna Benzi 10, Genova 16132, Italy
| | - Giancarlo Orofino
- SOC Malattie Infettive ASO S.S. Antonio e Biagio e C. Arrigo Alessandria, 15100, Italy
| | - Eugenio Mantia
- U.O.C. Malattie Infettive, Ospedale Amedeo di Savoia, Torino 10149, Italy
| | - Silvia Boni
- U.O.C. Malattie Infettive, Ospedale Sant'Andrea, La Spezia 19121, Italy
| | - Pasqualina De Leo
- U.O.C. Malattie Infettive, Azienda Sanitaria Locale n.2, Savona 17100, Italy
| | - Antonino Picciotto
- Allergy and Respiratory Unit, Department of Internal Medicine, University of Genova, Via Pastore 1, Genova 16132, Italy
| | - Fulvio Braido
- Hepatology Unit, Department of Internal Medicine, University of Genova, Via Pastore 1, Genova 16132, Italy
| | | | - Ena Wang
- Department of Transfusion Medicine, Clinical Center and Center of Human Immunology, National Institutes of Health, Bethesda, Maryland 20892, USA.,Sidra Medical and Research Centre, Doha P.O. BOX 26999, Qatar
| | | | | | - Andrea De Maria
- Center for Excellence in Biomedical Research, University of Genova, Via Pastore 1, Genova 16132, Italy.,Clinica Malattie Infettive, IRCCS AOU San Martino-IST Genova, Istituto Nazionale per la Ricerca sul Cancro, Largo Rosanna Benzi 10, Genova 16132, Italy.,Department of Health Sciences, DISSAL, University of Genova, Via Pastore 1, Genova 16132, Italy
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6
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Cantoni C, Grauwet K, Pietra G, Parodi M, Mingari MC, Maria AD, Favoreel H, Vitale M. Role of NK cells in immunotherapy and virotherapy of solid tumors. Immunotherapy 2015; 7:861-82. [PMID: 26314197 DOI: 10.2217/imt.15.53] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
Although natural killer (NK) cells are endowed with powerful cytolytic activity against cancer cells, their role in different therapies against solid tumors has not yet been fully elucidated. Their interactions with various elements of the tumor microenvironment as well as their possible effects in contributing to and/or limiting oncolytic virotherapy render this potential immunotherapeutic tool still difficult to exploit at the bedside. Here, we will review the current literature with the aim of providing new hints to manage this powerful cell type in future innovative therapies, such as the use of NK cells in combination with new cytokines, specific mAbs (inducing ADCC), Tyr-Kinase inhibitors, immunomodulatory drugs and/or the design of oncolytic viruses aimed at optimizing the effect of NK cells in virotherapy.
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Affiliation(s)
- Claudia Cantoni
- Department of Experimental Medicine (DIMES), University of Genova, Genova, Italy.,Center of Excellence for Biomedical Research (CEBR), University of Genova, Genova, Italy.,Istituto Giannina Gaslini, Genova, Italy
| | - Korneel Grauwet
- Laboratory of Immunology, Department of Virology, Parasitology & Immunology, Faculty of Veterinary Medicine, Ghent University, Belgium
| | - Gabriella Pietra
- Department of Experimental Medicine (DIMES), University of Genova, Genova, Italy.,IRCCS AOU San Martino-IST Genova, Genova, Italy
| | - Monica Parodi
- Department of Experimental Medicine (DIMES), University of Genova, Genova, Italy
| | - Maria Cristina Mingari
- Department of Experimental Medicine (DIMES), University of Genova, Genova, Italy.,Center of Excellence for Biomedical Research (CEBR), University of Genova, Genova, Italy.,IRCCS AOU San Martino-IST Genova, Genova, Italy
| | - Andrea De Maria
- Center of Excellence for Biomedical Research (CEBR), University of Genova, Genova, Italy.,IRCCS AOU San Martino-IST Genova, Genova, Italy.,Department of Health Sciences (DISSAL), University of Genova, Genova, Italy
| | - Herman Favoreel
- Laboratory of Immunology, Department of Virology, Parasitology & Immunology, Faculty of Veterinary Medicine, Ghent University, Belgium
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Marras F, Bozzano F, Bentivoglio G, Ugolotti E, Biassoni R, Moretta L, De Maria A. Receptor modulation and functional activation of human CD34+ Lin- -derived immature NK cells in vitro by Mycobacterium bovis Bacillus Calmette-Guerin (BCG). Eur J Immunol 2012; 42:2459-70. [PMID: 22736333 DOI: 10.1002/eji.201242375] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2012] [Revised: 04/26/2012] [Accepted: 05/25/2012] [Indexed: 12/15/2022]
Abstract
It is not yet clear whether immature NK (iNK) cells are bystanders to or rather participate in immune responses to pathogens that may colocalize in areas of NK-cell maturation such as bone marrow or lymph nodes. Mycobacteria, including Bacillus Calmette-Guerin (BCG), have been shown to interact with peripheral NK cells and in vivo may colocalize in areas of iNK-cell development. We studied infection with BCG of human cord blood CD34(+) Lin(-)-derived cultures containing myelomonocytes and iNK cells in vitro. Increased iNK-cell DNAM-1 expression, transient natural cytotoxicity receptor modulation, and production of IFN-γ were observed. Transcriptional receptor modulation was associated to BCG challenge, which determined increased iNK-cell cytotoxic activity against tumor cell lines and also increased killing of immature dendritic cells (iDCs). No requirement for cell contact was recorded for BCG-induced iNK-cell activation, while cytokine production including IL-18, IL-10, GM-CSF, and TGF-β contributed to the observed effects. Thus, iNK cells are affected by mycobacteria in vitro and may contribute to shaping of adaptive mature innate responses through iDC-iNK cross-talk. In addition, iNK-cell activation by BCG may represent a novel additional mechanism contributing to the effects observed upon BCG administration in vivo.
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MESH Headings
- Antigens, CD34/genetics
- Antigens, CD34/immunology
- Antigens, CD34/metabolism
- Antigens, Differentiation, T-Lymphocyte/genetics
- Antigens, Differentiation, T-Lymphocyte/metabolism
- BCG Vaccine/immunology
- Cytotoxicity, Immunologic/genetics
- Cytotoxicity, Immunologic/immunology
- Dendritic Cells/immunology
- Dendritic Cells/metabolism
- Granulocyte-Macrophage Colony-Stimulating Factor/genetics
- Granulocyte-Macrophage Colony-Stimulating Factor/immunology
- Granulocyte-Macrophage Colony-Stimulating Factor/metabolism
- Humans
- Interferon-gamma/genetics
- Interferon-gamma/immunology
- Interferon-gamma/metabolism
- Interleukin-10/genetics
- Interleukin-10/immunology
- Interleukin-10/metabolism
- Interleukin-18/genetics
- Interleukin-18/immunology
- Interleukin-18/metabolism
- K562 Cells
- Killer Cells, Natural/immunology
- Killer Cells, Natural/metabolism
- Lymphocyte Activation
- Monocytes/immunology
- Monocytes/metabolism
- Mycobacterium bovis/genetics
- Mycobacterium bovis/immunology
- Mycobacterium bovis/metabolism
- Receptors, Immunologic/genetics
- Receptors, Immunologic/immunology
- Receptors, Immunologic/metabolism
- Transforming Growth Factor beta/genetics
- Transforming Growth Factor beta/immunology
- Transforming Growth Factor beta/metabolism
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Interferon-alpha administration enhances CD8+ T cell activation in HIV infection. PLoS One 2012; 7:e30306. [PMID: 22291932 PMCID: PMC3265460 DOI: 10.1371/journal.pone.0030306] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2011] [Accepted: 12/13/2011] [Indexed: 12/11/2022] Open
Abstract
Background Type I interferons play important roles in innate immune defense. In HIV infection, type I interferons may delay disease progression by inhibiting viral replication while at the same time accelerating disease progression by contributing to chronic immune activation. Methods To investigate the effects of type I interferons in HIV-infection, we obtained cryopreserved peripheral blood mononuclear cell samples from 10 subjects who participated in AIDS Clinical Trials Group Study 5192, a trial investigating the activity of systemic administration of IFNα for twelve weeks to patients with untreated HIV infection. Using flow cytometry, we examined changes in cell cycle status and expression of activation antigens by circulating T cells and their maturation subsets before, during and after IFNα treatment. Results The proportion of CD38+HLA-DR+CD8+ T cells increased from a mean of 11.7% at baseline to 24.1% after twelve weeks of interferon treatment (p = 0.006). These frequencies dropped to an average of 20.1% six weeks after the end of treatment. In contrast to CD8+ T cells, the frequencies of activated CD4+ T cells did not change with administration of type I interferon (mean percentage of CD38+DR+ cells = 2.62% at baseline and 2.17% after 12 weeks of interferon therapy). As plasma HIV levels fell with interferon therapy, this was correlated with a “paradoxical” increase in CD8+ T cell activation (p<0.001). Conclusion Administration of type I interferon increased expression of the activation markers CD38 and HLA DR on CD8+ T cells but not on CD4+ T cells of HIV+ persons. These observations suggest that type I interferons may contribute to the high levels of CD8+ T cell activation that occur during HIV infection.
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Involvement of activating NK cell receptors and their modulation in pathogen immunity. J Biomed Biotechnol 2011; 2011:152430. [PMID: 21860586 PMCID: PMC3155793 DOI: 10.1155/2011/152430] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2011] [Accepted: 05/23/2011] [Indexed: 01/20/2023] Open
Abstract
Natural Killer (NK) cells are endowed with cell-structure-sensing receptors providing inhibitory protection from self-destruction (inhibitory NK receptors, iNKRs, including killer inhibitory receptors and other molecules) and rapid triggering potential leading to functional cell activation by Toll-like receptors (TLRs), cytokine receptors, and activating NK cell receptors including natural cytotoxicity receptors (NCRs, i.e., NKp46, NKp46, and NKp44). NCR and NKG2D recognize ligands on infected cells which may be endogenous or may directly bind to some structures derived from invading pathogens. In this paper, we address the known direct or indirect interactions between activating receptors and pathogens and their expression during chronic HIV and HCV infections.
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10
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Severe impairment of IFN-γ and IFN-α responses in cells of a patient with a novel STAT1 splicing mutation. Blood 2011; 118:1806-17. [PMID: 21772053 DOI: 10.1182/blood-2011-01-330571] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Subjects affected by Signal Transducer and Activator of Transcription 1 (STAT1) deficiency have lethal bacterial and viral infections. Complete STAT1 deficiency is inherited as an autosomal recessive disease; partial STAT1 deficiency is inherited as an autosomal recessive or autosomal dominant trait. Here, we report a patient who developed disseminated mycobacteriosis early in life and had several viral infections, including herpetic skin infection and interstitial pneumonia by cytomegalovirus with severe respiratory distress. Molecular analysis of STAT1 showed a novel homozygous mutation affecting a splice site, leading to exon 3 skipping and to synthesis of a lower molecular weight STAT1 protein. This mutation leads to marked reduction of STAT1 phosphorylation; the electromobility shift assay showed a complete defect of DNA-binding activity, which accounts for the complete impairment of peripheral blood mononuclear cell functional response to both IFN-γ and IFN-α. Moreover, analysis of natural killer cells showed a defective STAT1 phosphorylation in response to IFN-α and impaired basal cytolytic activity, suggesting that the STAT1-dependent pathway might be important for natural killer cell function. These results suggested that exon 3 skipping of STAT1 leads to abnormal signaling in response to IFN-γ and IFN-α, which is associated with susceptibility to intracellular pathogens and viruses.
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