1
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Ritu, Chandra P, Das A. Immune checkpoint targeting antibodies hold promise for combinatorial cancer therapeutics. Clin Exp Med 2023; 23:4297-4322. [PMID: 37804358 DOI: 10.1007/s10238-023-01201-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2023] [Accepted: 09/19/2023] [Indexed: 10/09/2023]
Abstract
Through improving the immune system's ability to recognize and combat tumor cells as well as its receptivity to changes in the tumor microenvironment, immunotherapy has emerged as a highly successful addition to the treatment of cancer. However, tumor heterogeneity poses a significant challenge in cancer therapy as it can undermine the anti-tumor immune response through the manipulation of the extracellular matrix. To address these challenges and improve targeted therapies and combination treatments, the food and drug administration has approved several immunomodulatory antibodies to suppress immunological checkpoints. Combinatorial therapies necessitate the identification of multiple targets that regulate the intricate communication between immune cells, cytokines, chemokines, and cellular responses within the tumor microenvironment. The purpose of this study is to provide a comprehensive overview of the ongoing clinical trials involving immunomodulatory antibodies in various cancer types. It explores the potential of these antibodies to modulate the immune system and enhance anti-tumor responses. Additionally, it discusses the perspectives and prospects of immunomodulatory therapeutics in cancer treatment. Although immunotherapy shows great promise in cancer treatment, it is not exempt from side effects that can arise due to hyperactivity of the immune system. Therefore, understanding the intricate balance between immune activation and regulation is crucial for minimizing these adverse effects and optimizing treatment outcomes. This study aims to contribute to the growing body of knowledge surrounding immunomodulatory antibodies and their potential as effective therapeutic options in cancer treatment, ultimately paving the way for improved patient outcomes and deepening our perception of the intricate interactivity between the immune system and tumors.
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Affiliation(s)
- Ritu
- Department of Biotechnology, Delhi Technological University, Main Bawana Road, New Delhi, 110042, India
| | - Prakash Chandra
- Department of Biotechnology, Delhi Technological University, Main Bawana Road, New Delhi, 110042, India
| | - Asmita Das
- Department of Biotechnology, Delhi Technological University, Main Bawana Road, New Delhi, 110042, India.
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2
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Belghali MY, El Moumou L, Hazime R, Brahimi M, El Marrakchi M, Belaid HA, Benali SA, Khouchani M, Ba-M'hamed S, Admou B. Phenotypic characterization of human peripheral γδT-Cell subsets in glioblastoma. Microbiol Immunol 2022; 66:465-476. [PMID: 35718749 DOI: 10.1111/1348-0421.13016] [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: 03/01/2022] [Revised: 05/27/2022] [Accepted: 06/15/2022] [Indexed: 11/29/2022]
Abstract
INTRODUCTION The anti-tumoral contribution of γδT cells depends on their activation and differentiation into effectors. This depends on different molecules and membrane receptors, which conditions their physiology. We aimed to determine the phenotypic characteristics of γδT cells in glioblastoma (GBM) according to five layers of membrane receptors. METHODS Among ten GBM cases initially enrolled, five of them who had been confirmed by pathological examination and ten healthy controls underwent phenotyping of peripheral γδT cells by flow cytometry, using the following staining: αβTCR, γδTCR, CD3, CD4, CD8, CD16, CD25, CD27, CD28, CD45, CD45RA, CD56, NKG2D, CD272(BTLA) and CD279(PD-1). RESULTS Compared to controls, our results showed no significant change in the number of γδT cells. However, we noted a decrease of double-negative (CD4- CD8- ) Tγδ cells and an increase of naive γδT cells, a lack of CD25 expression, a decrease of the expression of CD279 and a remarkable, but not significant increase in the expression of the CD27 and CD28 costimulation markers. Among γδT cell subsets, the number of Vδ2 decreased in GBM and showed no significant difference in the expression of CD16, CD56 and NKG2D. In contrast, the number of Vδ1 increased in GBM with overexpression of CD16, CD56 and NKG2D. CONCLUSION Our results showed that γδT cells are prone to adopt a pro-inflammatory profile in the GBM's context, which suggests that they might be a potential tool to consider in T cell-based immunotherapy in GBM. However, this requires additional investigation on larger sample size. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Moulay Yassine Belghali
- Group of morphology and biology of cancers. Faculty of medicine and pharmacy, Cadi Ayyad University, Marrakech, Morocco.,Laboratory of Pharmacology, neurobiology, anthropology and environment, Cadi Ayyad University, Marrakech, Morocco.,Laboratory of Immunology, Center of Clinical Research, University Hospital Mohammed VI, Marrakech, Morocco
| | | | - Raja Hazime
- Laboratory of Immunology, Center of Clinical Research, University Hospital Mohammed VI, Marrakech, Morocco
| | - Maroua Brahimi
- Laboratory of pathology, Mohammed V Hospital, Safi, Morocco
| | - Malak El Marrakchi
- Neurosurgery Department, Mohammed VI University Hospital Center, Cadi Ayyad University, Marrakech, Morocco
| | - Hasna Ait Belaid
- Group of morphology and biology of cancers. Faculty of medicine and pharmacy, Cadi Ayyad University, Marrakech, Morocco
| | - Said Ait Benali
- Neurosurgery Department, Mohammed VI University Hospital Center, Cadi Ayyad University, Marrakech, Morocco
| | - Mouna Khouchani
- Group of morphology and biology of cancers. Faculty of medicine and pharmacy, Cadi Ayyad University, Marrakech, Morocco
| | - Saadia Ba-M'hamed
- Laboratory of Pharmacology, neurobiology, anthropology and environment, Cadi Ayyad University, Marrakech, Morocco
| | - Brahim Admou
- Laboratory of Immunology, Center of Clinical Research, University Hospital Mohammed VI, Marrakech, Morocco.,Bioscience Research Laboratory, Faculty of Medicine and Pharmacy, Cadi Ayyad University, Marrakech, Morocco
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3
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Rawat P, Das A. Differential expression of disparate transcription factor regime holds the key for NK cell development and function modulation. Life Sci 2022; 297:120471. [DOI: 10.1016/j.lfs.2022.120471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2021] [Revised: 03/05/2022] [Accepted: 03/07/2022] [Indexed: 10/18/2022]
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4
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Rosenstock P, Kaufmann T. Sialic Acids and Their Influence on Human NK Cell Function. Cells 2021; 10:263. [PMID: 33572710 PMCID: PMC7911748 DOI: 10.3390/cells10020263] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Revised: 01/26/2021] [Accepted: 01/26/2021] [Indexed: 12/14/2022] Open
Abstract
Sialic acids are sugars with a nine-carbon backbone, present on the surface of all cells in humans, including immune cells and their target cells, with various functions. Natural Killer (NK) cells are cells of the innate immune system, capable of killing virus-infected and tumor cells. Sialic acids can influence the interaction of NK cells with potential targets in several ways. Different NK cell receptors can bind sialic acids, leading to NK cell inhibition or activation. Moreover, NK cells have sialic acids on their surface, which can regulate receptor abundance and activity. This review is focused on how sialic acids on NK cells and their target cells are involved in NK cell function.
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Affiliation(s)
- Philip Rosenstock
- Institute for Physiological Chemistry, Martin-Luther-University Halle-Wittenberg, Hollystr. 1, D-06114 Halle/Saale, Germany;
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5
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Mariotti FR, Quatrini L, Munari E, Vacca P, Tumino N, Pietra G, Mingari MC, Moretta L. Inhibitory checkpoints in human natural killer cells: IUPHAR Review 28. Br J Pharmacol 2020; 177:2889-2903. [PMID: 32335915 PMCID: PMC7279970 DOI: 10.1111/bph.15081] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Revised: 04/14/2020] [Accepted: 04/15/2020] [Indexed: 12/12/2022] Open
Abstract
Immune checkpoint inhibitors have revolutionized cancer therapy leading to exceptional success. However, there is still the need to improve their efficacy in non‐responder patients. Natural killer (NK) cells represent the first line of defence against tumours, due to their ability to release immunomodulatory cytokines and kill target cells that have undergone malignant transformation. Harnessing NK cell response will open new possibilities to improve control of tumour growth. In this respect inhibitory checkpoints expressed on these innate lymphocytes represents a promising target for next‐generation immunotherapy. In this review, we will summarize recent evidences on the expression of NK cells receptors in cancer, with a focus on the inhibitory checkpoint programmed cell death protein 1 (PD‐1). We will also highlight the strength and limitations of the blockade of PD‐1 inhibitory pathway and suggest new combination strategies that may help to unleash more efficiently NK cell anti‐tumour response.
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Affiliation(s)
- F R Mariotti
- Department of Immunology, IRCCS Bambino Gesù Children's Hospital, Rome, Italy
| | - L Quatrini
- Department of Immunology, IRCCS Bambino Gesù Children's Hospital, Rome, Italy
| | - E Munari
- Department of Pathology, Sacro Cuore Don Calabria, Negrar, Italy
| | - P Vacca
- Department of Immunology, IRCCS Bambino Gesù Children's Hospital, Rome, Italy
| | - N Tumino
- Department of Immunology, IRCCS Bambino Gesù Children's Hospital, Rome, Italy
| | - G Pietra
- Laboratory of Immunology, Department of Integrated Oncological Therapies, IRCCS Ospedale Policlinico San Martino, Genoa, Italy.,Department of Experimental Medicine (DIMES), Università di Genova, Genoa, Italy
| | - M C Mingari
- Laboratory of Immunology, Department of Integrated Oncological Therapies, IRCCS Ospedale Policlinico San Martino, Genoa, Italy.,Department of Experimental Medicine (DIMES), Center of Excellence for Biomedical Research, Università di Genova, Genoa, Italy
| | - L Moretta
- Department of Immunology, IRCCS Bambino Gesù Children's Hospital, Rome, Italy
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6
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Meza Guzman LG, Keating N, Nicholson SE. Natural Killer Cells: Tumor Surveillance and Signaling. Cancers (Basel) 2020; 12:cancers12040952. [PMID: 32290478 PMCID: PMC7226588 DOI: 10.3390/cancers12040952] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Revised: 04/03/2020] [Accepted: 04/09/2020] [Indexed: 12/17/2022] Open
Abstract
Natural killer (NK) cells play a pivotal role in cancer immunotherapy due to their innate ability to detect and kill tumorigenic cells. The decision to kill is determined by the expression of a myriad of activating and inhibitory receptors on the NK cell surface. Cell-to-cell engagement results in either self-tolerance or a cytotoxic response, governed by a fine balance between the signaling cascades downstream of the activating and inhibitory receptors. To evade a cytotoxic immune response, tumor cells can modulate the surface expression of receptor ligands and additionally, alter the conditions in the tumor microenvironment (TME), tilting the scales toward a suppressed cytotoxic NK response. To fully harness the killing power of NK cells for clinical benefit, we need to understand what defines the threshold for activation and what is required to break tolerance. This review will focus on the intracellular signaling pathways activated or suppressed in NK cells and the roles signaling intermediates play during an NK cytotoxic response.
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Affiliation(s)
- Lizeth G. Meza Guzman
- The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC 3052, Australia;
- Department of Medical Biology, The University of Melbourne, Parkville, VIC 3010, Australia
- Correspondence: (L.G.M.G.); (S.E.N.); Tel.: +61-9345-2555 (S.E.N.)
| | - Narelle Keating
- The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC 3052, Australia;
- Department of Medical Biology, The University of Melbourne, Parkville, VIC 3010, Australia
| | - Sandra E. Nicholson
- The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC 3052, Australia;
- Department of Medical Biology, The University of Melbourne, Parkville, VIC 3010, Australia
- Correspondence: (L.G.M.G.); (S.E.N.); Tel.: +61-9345-2555 (S.E.N.)
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7
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Taefehshokr N, Baradaran B, Baghbanzadeh A, Taefehshokr S. Promising approaches in cancer immunotherapy. Immunobiology 2020; 225:151875. [DOI: 10.1016/j.imbio.2019.11.010] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2019] [Revised: 10/03/2019] [Accepted: 11/25/2019] [Indexed: 02/06/2023]
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8
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Mimpen M, Smolders J, Hupperts R, Damoiseaux J. Natural killer cells in multiple sclerosis: A review. Immunol Lett 2020; 222:1-11. [PMID: 32113900 DOI: 10.1016/j.imlet.2020.02.012] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Revised: 02/17/2020] [Accepted: 02/26/2020] [Indexed: 12/13/2022]
Abstract
As the most common non-traumatic disabling disease among adolescents, multiple sclerosis (MS) is a devastating neurological inflammatory disease of the central nervous system. Research has not yet fully elucidated its pathogenesis, but it has shown MS to be a complex, multifactorial disease with many interplaying factors. One of these factors, natural killer (NK) cells, lymphocytes of the innate immune system, have recently gained attention due to the effects of daclizumab therapy, causing an expansion of the immunoregulatory subset of NK cells. Since then, NK cells and their relation to MS have been the focus of research, with many new findings being published in the last decade. In this review, NK cells are pictured as potent cytotoxic killers, as well as unique immune-regulators. Additionally, an overview of our current knowledge regarding NK cells in MS is given. The role of NK cells in MS is reviewed in the context of well-established environmental factors and current disease modifying therapies to gain further understanding of the pathogenesis and treatment options in MS.
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Affiliation(s)
- Max Mimpen
- School for Mental Health and Neuroscience, University of Maastricht, Maastricht The Netherlands
| | - Joost Smolders
- Department of Neurology, Erasmus University Medical Center, Rotterdam The Netherlands; Department of Neuroimmunology, Netherlands Institute for Neuroscience, Amsterdam The Netherlands
| | - Raymond Hupperts
- School for Mental Health and Neuroscience, University of Maastricht, Maastricht The Netherlands; Department of Neurology, Zuyderland Medical Center, Sittard The Netherlands
| | - Jan Damoiseaux
- Central Diagnostic Laboratory, Maastricht University Medical Center, Maastricht The Netherlands.
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9
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Hu CHD, Kosaka Y, Marcus P, Rashedi I, Keating A. Differential Immunomodulatory Effects of Human Bone Marrow-Derived Mesenchymal Stromal Cells on Natural Killer Cells. Stem Cells Dev 2019; 28:933-943. [DOI: 10.1089/scd.2019.0059] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Affiliation(s)
- Chia-Hsuan Donna Hu
- Cell Therapy Translational Research Laboratory, Princess Margaret Cancer Center, Krembil Research Institute, University Health Network, Toronto, ON, Canada
| | - Yoko Kosaka
- Cell Therapy Translational Research Laboratory, Princess Margaret Cancer Center, Krembil Research Institute, University Health Network, Toronto, ON, Canada
| | - Paula Marcus
- Cell Therapy Translational Research Laboratory, Princess Margaret Cancer Center, Krembil Research Institute, University Health Network, Toronto, ON, Canada
| | - Iran Rashedi
- Cell Therapy Translational Research Laboratory, Princess Margaret Cancer Center, Krembil Research Institute, University Health Network, Toronto, ON, Canada
| | - Armand Keating
- Cell Therapy Translational Research Laboratory, Princess Margaret Cancer Center, Krembil Research Institute, University Health Network, Toronto, ON, Canada
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10
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Kim N, Lee HH, Lee HJ, Choi WS, Lee J, Kim HS. Natural killer cells as a promising therapeutic target for cancer immunotherapy. Arch Pharm Res 2019; 42:591-606. [DOI: 10.1007/s12272-019-01143-y] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2019] [Accepted: 03/08/2019] [Indexed: 02/06/2023]
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11
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Kim N, Kim HS. Targeting Checkpoint Receptors and Molecules for Therapeutic Modulation of Natural Killer Cells. Front Immunol 2018; 9:2041. [PMID: 30250471 PMCID: PMC6139314 DOI: 10.3389/fimmu.2018.02041] [Citation(s) in RCA: 74] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2018] [Accepted: 08/20/2018] [Indexed: 12/30/2022] Open
Abstract
Among the most promising therapeutic modalities for cancer treatment is the blockade of immune checkpoint pathways, which are frequently co-opted by tumors as a major mechanism of immune escape. CTLA-4 and PD-1 are the representative examples, and their blockade by therapeutic antibodies leads to enhanced anti-tumor immunity with durable clinical responses, but only in a minority of patients. This has highlighted the need to identify and target additional immune checkpoints that can be exploited to further enhance immune responses to refractory cancers. These emerging targets include natural killer (NK) cell-directed checkpoint receptors (KIR and CD94/NKG2A) as well as the NK- and T cell-expressed checkpoints TIM-3, TIGIT, CD96, and LAG-3. Interestingly, the potentiation of anti-tumor immunity by checkpoint blockade relies not only on T cells but also on other components of the innate immune system, including NK cells. NK cells are innate lymphoid cells that efficiently kill tumor cells without MHC specificity, which is complementary to the MHC-restricted tumor lysis mediated by cytotoxic T cells. However, the role of these immune checkpoints in modulating the function of NK cells remains unclear and somewhat controversial. Unraveling the mechanisms by which these immune checkpoints function in NK cells and other immune cells will pave the way to developing new therapeutic strategies to optimize anti-tumor immunity while limiting cancer immune escape. Here, we focus on recent findings regarding the roles of immune checkpoints in regulating NK cell function and their potential application in cancer immunotherapy.
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Affiliation(s)
- Nayoung Kim
- Department of Convergence Medicine, University of Ulsan College of Medicine, Seoul, South Korea.,Asan Institute for Life Sciences, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea
| | - Hun Sik Kim
- Department of Biomedical Sciences, University of Ulsan College of Medicine, Seoul, South Korea.,Department of Microbiology, University of Ulsan College of Medicine, Seoul, South Korea.,Stem Cell Immunomodulation Research Center (SCIRC), Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea
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12
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Huang Y, Chen Z, Jang JH, Baig MS, Bertolet G, Schroeder C, Huang S, Hu Q, Zhao Y, Lewis DE, Qin L, Zhu MX, Liu D. PD-1 blocks lytic granule polarization with concomitant impairment of integrin outside-in signaling in the natural killer cell immunological synapse. J Allergy Clin Immunol 2018; 142:1311-1321.e8. [PMID: 29679656 DOI: 10.1016/j.jaci.2018.02.050] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2016] [Revised: 02/09/2018] [Accepted: 02/23/2018] [Indexed: 12/24/2022]
Abstract
BACKGROUND The inhibitory receptor programmed cell death protein 1 (PD-1) is upregulated on a variety of immune cells, including natural killer (NK) cells, during chronic viral infection and tumorigenesis. Blockade of PD-1 or its ligands produces durable clinical responses with tolerable side effects in patients with a broad spectrum of cancers. However, the underlying molecular mechanisms of how PD-1 regulates NK cell function remain poorly characterized. OBJECTIVE We sought to determine the effect of PD-1 signaling on NK cells. METHODS PD-1 was overexpressed in CD16-KHYG-1 (a human NK cell line with both antibody-dependent cellular cytotoxicity through CD16 and natural cytotoxicity through NKG2D) cells and stimulated by exposing the cells to NK-sensitive target cells expressing programmed death ligand 1 (PD-L1). RESULTS PD-1 engagement by PD-L1 specifically blocked NK cell-mediated cytotoxicity without interfering with the conjugation between NK cells and target cells. Further examination showed that PD-1 signaling blocked lytic granule polarization in NK cells, which was accompanied by failure of integrin-linked kinase, a key molecule in the integrin outside-in signaling pathway, to accumulate in the immunological synapse after NK-target cell conjugation. CONCLUSION Our results suggest that NK cell cytotoxicity is inhibited by PD-1 engagement, which blocks lytic granule polarization to the NK cell immunological synapse with concomitant impairment of integrin outside-in signaling. This study provides novel mechanistic insights into how PD-1 inhibition disrupts NK cell function.
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Affiliation(s)
- Yu Huang
- Department of Integrative Biology and Pharmacology, McGovern Medical School, Graduate Program in Cell and Regulatory Biology, the University of Texas Health Science Center at Houston, Houston, Tex; Center for Inflammation and Epigenetics, Houston Methodist Research Institute, Houston, Tex
| | - Zhiying Chen
- Center for Inflammation and Epigenetics, Houston Methodist Research Institute, Houston, Tex; Xiangya Hospital, Xiangya School of Medicine, Central South University, Changsha, China
| | - Joon Hee Jang
- Center for Inflammation and Epigenetics, Houston Methodist Research Institute, Houston, Tex; Department of Nanomedicine, Houston Methodist Research Institute, Houston, Tex
| | - Mirza S Baig
- Center for Biosciences and Biomedical Engineering (BSBE), Indian Institute of Technology (IIT), Indore, India
| | - Grant Bertolet
- Center for Inflammation and Epigenetics, Houston Methodist Research Institute, Houston, Tex; Department of Pathology and Immunology, Baylor College of Medicine, Houston, Tex
| | - Casey Schroeder
- Center for Inflammation and Epigenetics, Houston Methodist Research Institute, Houston, Tex
| | - Shengjian Huang
- Department of Lymphoma and Myeloma, the University of Texas MD Anderson Cancer Center, Houston, Tex
| | - Qian Hu
- Center for Inflammation and Epigenetics, Houston Methodist Research Institute, Houston, Tex; Key Laboratory of Gene Engineering of the Ministry of Education, Cooperative Innovation Center for High Performance Computing, School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Yong Zhao
- Key Laboratory of Gene Engineering of the Ministry of Education, Cooperative Innovation Center for High Performance Computing, School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Dorothy E Lewis
- Department of Internal Medicine, University of Texas Health Science Center at Houston, Houston, Tex
| | - Lidong Qin
- Department of Nanomedicine, Houston Methodist Research Institute, Houston, Tex
| | - Michael Xi Zhu
- Department of Integrative Biology and Pharmacology, McGovern Medical School, Graduate Program in Cell and Regulatory Biology, the University of Texas Health Science Center at Houston, Houston, Tex.
| | - Dongfang Liu
- Center for Inflammation and Epigenetics, Houston Methodist Research Institute, Houston, Tex; Department of Microbiology and Immunology, Weill Cornell Medical College, Cornell University, New York, NY.
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Abstract
Natural killer (NK) cells express an array of germ-line encoded receptors that are capable of triggering cytotoxicity. NK cells tend to express many members of a given family of signalling molecules. The presence of many activating receptors and many members of a given family of signalling molecules can enable NK cells to detect different kinds of target cells, and to mount different kinds of responses. This contributes also to the robustness of NK cells responses; cytotoxic functions of NK cells often remain unaffected in the absence of selected signalling molecules. NK cells express many MHC-I-specific inhibitory receptors. Signals from MHC-I-specific inhibitory receptors tightly control NK cell cytotoxicity and, paradoxically, maintain NK cells in a state of proper responsiveness. This review provides a brief overview of the events that underlie NK cell activation, and how signals from inhibitory receptors intercept NK cell activation to prevent inappropriate triggering of cytotoxicity.
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Affiliation(s)
- Santosh Kumar
- CSIR-Centre for Cellular and Molecular Biology, Hyderabad, Telangana, India
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14
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Urlaub D, Höfer K, Müller ML, Watzl C. LFA-1 Activation in NK Cells and Their Subsets: Influence of Receptors, Maturation, and Cytokine Stimulation. THE JOURNAL OF IMMUNOLOGY 2017; 198:1944-1951. [PMID: 28100681 DOI: 10.4049/jimmunol.1601004] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Accepted: 12/27/2016] [Indexed: 12/29/2022]
Abstract
The integrin LFA-1 is essential for efficient activation and for cytotoxicity of NK cells because it initiates the assembly of the immunological synapse and mediates firm adhesion to the target. LFA-1 is also needed to polarize the cytotoxic machinery of the NK cell toward the target cell. The binding affinity and avidity of integrins can be regulated via inside-out signals from other receptors. In this article, we investigate the signals necessary to activate LFA-1 in human NK cells. Our data show that LFA-1 has a low ligand-binding activity in resting human NK cells, but it can be stimulated by triggering activating receptors, such as 2B4 or CD16, or by coactivation of different receptor combinations. Short-term stimulation of freshly isolated NK cells with cytokines, such as IL-15, IL-12, or IL-18, does not activate LFA-1 but increases the responsiveness of the cells to subsequent receptor stimulation. Different NK cell subsets vary in their ability to induce LFA-1 binding activity after activating receptor stimulation. Interestingly, the NK cell subsets that are more mature and possess higher cytotoxic potential also show the highest activation of LFA-1, which correlated with the expression of the small calcium-binding protein S100A4. Our data suggest that regulation of LFA-1 is one reason for the different activity of NK cells during differentiation.
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Affiliation(s)
- Doris Urlaub
- Department of Immunology, Leibniz Research Centre for Working Environment and Human Factors at Technical University Dortmund-IfADo, 44139 Dortmund, Germany; and
| | - Kristine Höfer
- Institute for Immunology, University Hospital Heidelberg, 69120 Heidelberg, Germany
| | - Martha-Lena Müller
- Institute for Immunology, University Hospital Heidelberg, 69120 Heidelberg, Germany
| | - Carsten Watzl
- Department of Immunology, Leibniz Research Centre for Working Environment and Human Factors at Technical University Dortmund-IfADo, 44139 Dortmund, Germany; and
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15
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Shwetank, Date OS, Carbone E, Manjunath R. Inhibition of ERK and proliferation in NK cell lines by soluble HLA-E released from Japanese encephalitis virus infected cells. Immunol Lett 2014; 162:94-100. [PMID: 25086398 DOI: 10.1016/j.imlet.2014.07.010] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2014] [Revised: 07/18/2014] [Accepted: 07/21/2014] [Indexed: 01/10/2023]
Abstract
Productive infection of human endothelial cells with Japanese encephalitis virus (JEV), a single stranded RNA virus induces shedding of sHLA-E. We show here that sHLA-E that is released upon infection with this flavivirus can inhibit IL-2 and PMA mediated ERK 1/2 phosphorylation in two NK cell lines, Nishi and NKL. Virus infected or IFN-γ treated cell culture supernatants containing sHLA-E were found to partially inhibit IL-2 mediated induction of CD25 molecules on NKL cells. It was also found that sHLA-E could inhibit IL-2 induced [(3)H]-thymidine incorporation suggesting that, similar to cell surface expressed HLA-E, sHLA-E could also inhibit NK cell responses. Hence JEV-induced shedding of sHLA-E needs further investigation to better understand immune responses in JEV infections since it may have a role in viral evasion of NK cell responses.
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Affiliation(s)
- Shwetank
- Department of Biochemistry, Indian Institute of Science, Bangalore 560012, India.
| | - Onkar Sanjay Date
- Department of Biochemistry, Indian Institute of Science, Bangalore 560012, India.
| | - Ennio Carbone
- Department of Experimental and Clinical Medicine "G Salvatore", University of Catanzaro Magna Graecia, Catanzaro 88100, Italy.
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16
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Sharma R, Das A. Organ-specific phenotypic and functional features of NK cells in humans. Immunol Res 2014; 58:125-31. [PMID: 24366663 DOI: 10.1007/s12026-013-8477-9] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Natural killer (NK) cells kill virus-infected and tumor target cells without prior sensitization. Each NK cell expresses a multitude of activating and inhibitory receptors, and the interplay of signals determines the outcome of NK cell activity. NK cell-mediated cytolysis of target cell involves polarized degranulation at effector-target interface. Peripheral blood NK cell constitutes about 10% of lymphocytes, and approximately 90% of peripheral blood NK cells are CD56(dim)CD16(+); however, there is a distinct subset of NK cells, CD56(bright)CD16(-), expressed by certain lymphoid organs which are able to produce large amounts of cytokines including interferon-γ, tumor necrosis factor, and granulocyte-macrophage colony-stimulating factor, but the cytotoxicity is attained only on their prolonged activation. In this review, we discuss the accumulated data on distinct phenotypes of NK cells in human uterus, liver, intestine, skin, and lung and also attempt to correlate their phenotype with corresponding activity and functions, with significant stress on the role of NK cells in pathology in the specific organs. Our detailed understanding of altered NK cell activity in different organs and their inherent cytotoxic activity against tumor target cells will help us design better immunotherapeutic strategies in NK cell-mediated cancer therapies.
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Affiliation(s)
- Richa Sharma
- Department of Biotechnology, Delhi Technological University, Bawana Road, New Delhi, 110042, Delhi, India
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Khaznadar Z, Henry G, Setterblad N, Agaugue S, Raffoux E, Boissel N, Dombret H, Toubert A, Dulphy N. Acute myeloid leukemia impairs natural killer cells through the formation of a deficient cytotoxic immunological synapse. Eur J Immunol 2014; 44:3068-80. [PMID: 25041786 DOI: 10.1002/eji.201444500] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2014] [Revised: 06/30/2014] [Accepted: 07/10/2014] [Indexed: 11/08/2022]
Abstract
Acute myeloid leukemia (AML) cells are killed by allogeneic NK cells. However, autologous NK cells from AML patients express decreased levels of activating receptors, and show reduced cytotoxicity. Here, we investigated how interactions between NK and AML cells might cause loss of NK-cell activity in patients. Our results show that AML cell lines and primary blasts alter the NK-cell phenotype, reducing their cytotoxic potential upon prolonged contact. Downregulation of NK-cell-activating receptors was contact-dependent and correlated with conjugate formation. Time-lapse imaging of HL60 AML cell line and NK-cell interactions showed a high proportion of noncytolytic contacts. Studies of NK-cell immunological synapses revealed a defect in lytic synapse formation. Namely, despite correct F-actin and LFA-1 recruitment, polarization of lytic granules toward primary blasts or AML cell lines was reduced. The NK-AML cell line synapses showed impairment of CD3ζ recruitment. Attempts to correct these synapse defects by cytokine stimulation of NK cells improved conjugate formation, but not granule polarization. Pretreatment of AML cell lines with the immunomodulating molecule lenalidomide significantly enhanced granule polarization. We speculate that combining immunomodulatory drugs and cytokines could increase AML cell sensitivity to autologous NK cells and reinforce the activity of allogeneic NK cells in adoptive immunotherapy.
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Affiliation(s)
- Zena Khaznadar
- Institut National de la Santé et de la Recherche Médicale (INSERM UMRS 1160), Paris, France; Institut Universitaire d'Hématologie, Univ Paris Diderot, Paris, France
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18
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Tognarelli S, Gayet J, Lambert M, Dupuy S, Karras A, Cohen P, Guillevin L, de Menthon M, Caillat-Zucman S. Tissue-specific microvascular endothelial cells show distinct capacity to activate NK cells: implications for the pathophysiology of granulomatosis with polyangiitis. THE JOURNAL OF IMMUNOLOGY 2014; 192:3399-408. [PMID: 24600034 DOI: 10.4049/jimmunol.1301508] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The relevance of tissue specificity of microvascular endothelial cells (MECs) in the response to inflammatory stimuli and sensitivity to immune cell-mediated injury is not well defined. We hypothesized that such MEC characteristics might shape their interaction with NK cells through the use of different adhesion molecules and NK cell receptor ligands or the release of different soluble factors and render them more or less vulnerable to NK cell injury during autoimmune vasculitis, such as granulomatosis with polyangiitis (GPA). To generate a comprehensive expression profile of human MECs of renal, lung, and dermal tissue origin, we characterized, in detail, their response to inflammatory cytokines and to proteinase 3, a major autoantigen in GPA, and analyzed the effects on NK cell activation. In this study, we show that renal MECs were more susceptible than lung and dermal MECs to the effect of inflammatory signals, showing upregulation of ICAM-1 and VCAM-1 on their surface, as well as release of CCL2, soluble fractalkine, and soluble VCAM-1. Proteinase 3-stimulated renal and lung MECs triggered CD107a degranulation in control NK cell. Notably, NK cells from GPA patients expressed markers of recent in vivo activation (CD69, CD107a), degranulated more efficiently than did control NK cells in the presence of renal MECs, and induced direct killing of renal MECs in vitro. These results suggest that, upon inflammatory conditions in GPA, renal MECs may contribute to the recruitment and activation of NK cells in the target vessel wall, which may participate in the necrotizing vasculitis of the kidney during this disease.
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Affiliation(s)
- Sara Tognarelli
- INSERM, U1016 Hôpital Saint-Vincent de Paul, 75014 Paris, France
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Yatagai Y, Sakamoto T, Masuko H, Kaneko Y, Yamada H, Iijima H, Naito T, Noguchi E, Hirota T, Tamari M, Imoto Y, Tokunaga T, Fujieda S, Konno S, Nishimura M, Hizawa N. Genome-wide association study for levels of total serum IgE identifies HLA-C in a Japanese population. PLoS One 2013; 8:e80941. [PMID: 24324648 PMCID: PMC3851760 DOI: 10.1371/journal.pone.0080941] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2013] [Accepted: 10/07/2013] [Indexed: 12/11/2022] Open
Abstract
Most of the previously reported loci for total immunoglobulin E (IgE) levels are related to Th2 cell-dependent pathways. We undertook a genome-wide association study (GWAS) to identify genetic loci responsible for IgE regulation. A total of 479,940 single nucleotide polymorphisms (SNPs) were tested for association with total serum IgE levels in 1180 Japanese adults. Fine-mapping with SNP imputation demonstrated 6 candidate regions: the PYHIN1/IFI16, MHC classes I and II, LEMD2, GRAMD1B, and chr13∶60576338 regions. Replication of these candidate loci in each region was assessed in 2 independent Japanese cohorts (n = 1110 and 1364, respectively). SNP rs3130941 in the HLA-C region was consistently associated with total IgE levels in 3 independent populations, and the meta-analysis yielded genome-wide significance (P = 1.07×10−10). Using our GWAS results, we also assessed the reproducibility of previously reported gene associations with total IgE levels. Nine of 32 candidate genes identified by a literature search were associated with total IgE levels after correction for multiple testing. Our findings demonstrate that SNPs in the HLA-C region are strongly associated with total serum IgE levels in the Japanese population and that some of the previously reported genetic associations are replicated across ethnic groups.
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Affiliation(s)
- Yohei Yatagai
- Department of Pulmonary Medicine, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
| | - Tohru Sakamoto
- Department of Pulmonary Medicine, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
- * E-mail:
| | - Hironori Masuko
- Department of Pulmonary Medicine, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
| | - Yoshiko Kaneko
- Department of Pulmonary Medicine, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
| | - Hideyasu Yamada
- Department of Pulmonary Medicine, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
| | | | | | - Emiko Noguchi
- Department of Medical Genetics, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
| | - Tomomitsu Hirota
- Laboratory for Respiratory Diseases, Center for Genomic Medicine, the Institute of Physical and Chemical Research (RIKEN), Kanagawa, Japan
| | - Mayumi Tamari
- Laboratory for Respiratory Diseases, Center for Genomic Medicine, the Institute of Physical and Chemical Research (RIKEN), Kanagawa, Japan
| | - Yoshimasa Imoto
- Department of Otorhinolaryngology-Head and Neck Surgery, Faculty of Medicine, University of Fukui, Fukui, Japan
| | - Takahiro Tokunaga
- Department of Otorhinolaryngology-Head and Neck Surgery, Faculty of Medicine, University of Fukui, Fukui, Japan
| | - Shigeharu Fujieda
- Department of Otorhinolaryngology-Head and Neck Surgery, Faculty of Medicine, University of Fukui, Fukui, Japan
| | - Satoshi Konno
- First Department of Medicine, School of Medicine, Hokkaido University, Hokkaido, Japan
| | - Masaharu Nishimura
- First Department of Medicine, School of Medicine, Hokkaido University, Hokkaido, Japan
| | - Nobuyuki Hizawa
- Department of Pulmonary Medicine, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
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Abstract
It has been over 30 years since the reorganization of both the microtubule network and a 'peculiar actin polarization' was reported at the contact area of cytotoxic T lymphocytes interacting with target cells. Since that time, hundreds of studies have been published in an effort to elucidate the structure and function of the microtubule network and the actin cytoskeleton in T-cell activation, migration, and effector function at the interface between a T cell and its cognate antigen-presenting cell or target cell. This interface has become known as the immunological synapse, and this review examines some of the roles played by the cytoskeleton at the synapse.
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Affiliation(s)
- Alex T Ritter
- Cambridge Institute for Medical Research, University of Cambridge Biomedical CampusCambridge, UK
| | - Karen L Angus
- Cambridge Institute for Medical Research, University of Cambridge Biomedical CampusCambridge, UK
| | - Gillian M Griffiths
- Cambridge Institute for Medical Research, University of Cambridge Biomedical CampusCambridge, UK
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Yin S, Zhang J, Mao Y, Hu Y, Cui L, Kang N, He W. Vav1-phospholipase C-γ1 (Vav1-PLC-γ1) pathway initiated by T cell antigen receptor (TCRγδ) activation is required to overcome inhibition by ubiquitin ligase Cbl-b during γδT cell cytotoxicity. J Biol Chem 2013; 288:26448-62. [PMID: 23897818 DOI: 10.1074/jbc.m113.484600] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
T cell antigen receptor γδ (TCRγδ) and natural killer group 2, member D (NKG2D) are two crucial receptors for γδT cell cytotoxicity. Compelling evidences suggest that γδT cell cytotoxicity is TCRγδ-dependent and can be co-stimulated by NKG2D. However, the molecular mechanism of underlying TCRγδ-dependent activation of γδT cells remains unclear. In this study we demonstrated that TCRγδ but not NKG2D engagement induced lytic granule polarization and promoted γδT cell cytotoxicity. TCRγδ activation alone was sufficient to trigger Vav1-dependent phospholipase C-γ1 signaling, resulting in lytic granule polarization and effective killing, whereas NKG2D engagement alone failed to trigger cytotoxicity-related signaling to overcome the inhibitory effect of Cbl-b; therefore, NKG2D engagement alone could not induce effective killing. However, NKG2D ligation augmented the activation of γδT cell cytotoxicity through the Vav1-phospholipase C-γ1 pathway. Vav1 overexpression or Cbl-b knockdown not only enhanced TCRγδ activation-initiated killing but also enabled NKG2D activation alone to induce γδT cell cytotoxicity. Taken together, our results suggest that the activation of γδT cell cytotoxicity requires a strong activation signal to overcome the inhibitory effect of Cbl-b. Our finding provides new insights into the molecular mechanisms underlying the initiation of γδT cell cytotoxicity and likely implications for optimizing γδT cell-based cancer immunotherapy.
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Affiliation(s)
- Shanshan Yin
- From the Department of Immunology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and School of Peking Union Medical College, National Key Laboratory of Medical Molecular Biology, Beijing 100005, China
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Huse M, Catherine Milanoski S, Abeyweera TP. Building tolerance by dismantling synapses: inhibitory receptor signaling in natural killer cells. Immunol Rev 2013; 251:143-53. [PMID: 23278746 DOI: 10.1111/imr.12014] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Cell surface receptors bearing immunotyrosine-based inhibitory motifs (ITIMs) maintain natural killer (NK) cell tolerance to normal host tissues. These receptors are difficult to analyze mechanistically because they block activating responses in a rapid and comprehensive manner. The advent of high-resolution single cell imaging techniques has enabled investigators to explore the cell biological basis of the inhibitory response. Recent studies using these approaches indicate that ITIM-containing receptors function at least in part by structurally undermining the immunological synapse between the NK cell and its target. In this review, we discuss these new advances and how they might relate to what is known about the biochemistry of inhibitory signaling in NK cells and other cell types.
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Affiliation(s)
- Morgan Huse
- Immunology Program, Memorial Sloan-Kettering Cancer Center, New York, NY 10065, USA.
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Long EO, Kim HS, Liu D, Peterson ME, Rajagopalan S. Controlling natural killer cell responses: integration of signals for activation and inhibition. Annu Rev Immunol 2013; 31:227-58. [PMID: 23516982 PMCID: PMC3868343 DOI: 10.1146/annurev-immunol-020711-075005] [Citation(s) in RCA: 867] [Impact Index Per Article: 78.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Understanding how signals are integrated to control natural killer (NK) cell responsiveness in the absence of antigen-specific receptors has been a challenge, but recent work has revealed some underlying principles that govern NK cell responses. NK cells use an array of innate receptors to sense their environment and respond to alterations caused by infections, cellular stress, and transformation. No single activation receptor dominates; instead, synergistic signals from combinations of receptors are integrated to activate natural cytotoxicity and cytokine production. Inhibitory receptors for major histocompatibility complex class I (MHC-I) have a critical role in controlling NK cell responses and, paradoxically, in maintaining NK cells in a state of responsiveness to subsequent activation events, a process referred to as licensing. MHC-I-specific inhibitory receptors both block activation signals and trigger signals to phosphorylate and inactivate the small adaptor Crk. These different facets of inhibitory signaling are incorporated into a revocable license model for the reversible tuning of NK cell responsiveness.
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Affiliation(s)
- Eric O. Long
- Laboratory of Immunogenetics, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, Maryland 20852
| | - Hun Sik Kim
- Laboratory of Immunogenetics, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, Maryland 20852
- Department of Medicine, Graduate School, University of Ulsan, Seoul 138-736, Korea;
| | - Dongfang Liu
- Laboratory of Immunogenetics, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, Maryland 20852
- Center for Human Immunobiology, Texas Children's Hospital, Baylor College of Medicine, Houston, Texas 77030;
| | - Mary E. Peterson
- Laboratory of Immunogenetics, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, Maryland 20852
| | - Sumati Rajagopalan
- Laboratory of Immunogenetics, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, Maryland 20852
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Loss of kindlin-3 alters the threshold for NK cell activation in human leukocyte adhesion deficiency-III. Blood 2012; 120:3915-24. [PMID: 22983444 DOI: 10.1182/blood-2012-02-410795] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Recent evidence suggests that kindlin-3 is a major coactivator, required for most, if not all, integrin activities. Here we studied the function of kindlin-3 in regulating NK cell activation by studying a patient with kindlin-3 deficiency (leukocyte adhesion deficiency-III). We found that kindlin-3 is required for NK cell migration and adhesion under shear force. Surprisingly, we also found that kindlin-3 lowers the threshold for NK cell activation. Loss of kindlin-3 has a pronounced effect on NK cell-mediated cytotoxicity triggered by single activating receptors. In contrast, for activation through multiple receptors, kindlin-3 deficiency is overcome and target cells killed. The realization that NK cell activity is impaired, but not absent in leukocyte adhesion deficiency, may lead to the development of more efficient therapy for this rare disease.
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Qin G, Liu Y, Zheng J, Xiang Z, Ng IHY, Malik Peiris JS, Lau YL, Tu W. Phenotypic and functional characterization of human γδ T-cell subsets in response to influenza A viruses. J Infect Dis 2012; 205:1646-53. [PMID: 22457284 DOI: 10.1093/infdis/jis253] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Like αβ T cells, human γδ T cells also have different subsets with distinct characteristics. Whether human Vγ9Vδ2 T cells have functionally different subsets in response to influenza A (fluA) viruses remains unknown. In this study, we show for the first time that both central (CD45RA(-)CD27(+)) and effector (CD45RA(-)CD27(-)) memory Vγ9Vδ2 T cells have similar levels of immediate interferon (IFN) γ and cytotoxic responses to human and avian fluA virus-infected cells. In contrast, CD56(+) Vγ9Vδ2 T cells have significantly higher cytotoxicity against fluA virus-infected cells compared with their CD56(-) counterparts, whereas both subsets have similar IFN-γ responses. We further demonstrate that the CD16-dependent degranulation pathway, but not antibody-dependent cell-mediated cytotoxicity, contribute to the superior cytotoxicity of CD56(+) Vγ9Vδ2 T cells. Our study provides further evidence for the phenotypic and functional characterization of human Vγ9Vδ2 T-cell subsets during fluA virus infection and may help improve the γδ T-cell-based immunotherapy for viral infection.
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Affiliation(s)
- Gang Qin
- Department of Paediatrics and Adolescent Medicine, University of Hong Kong, Hong Kong
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Abeyweera TP, Merino E, Huse M. Inhibitory signaling blocks activating receptor clustering and induces cytoskeletal retraction in natural killer cells. ACTA ACUST UNITED AC 2011; 192:675-90. [PMID: 21339333 PMCID: PMC3044118 DOI: 10.1083/jcb.201009135] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Natural killer (NK) lymphocytes use a variety of activating receptors to recognize and kill infected or tumorigenic cells during an innate immune response. To prevent targeting healthy tissue, NK cells also express numerous inhibitory receptors that signal through immunotyrosine-based inhibitory motifs (ITIMs). Precisely how signals from competing activating and inhibitory receptors are integrated and resolved is not understood. To investigate how ITIM receptor signaling impinges on activating pathways, we developed a photochemical approach for stimulating the inhibitory receptor KIR2DL2 during ongoing NK cell-activating responses in high-resolution imaging experiments. Photostimulation of KIR2DL2 induces the rapid formation of inhibitory receptor microclusters in the plasma membrane and the simultaneous suppression of microclusters containing activating receptors. This is followed by the collapse of the peripheral actin cytoskeleton and retraction of the NK cell from the source of inhibitory stimulation. These results suggest a cell biological basis for ITIM receptor signaling and establish an experimental framework for analyzing it.
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Affiliation(s)
- Thushara P Abeyweera
- Immunology Program, Memorial Sloan-Kettering Cancer Center, New York, NY 10065, USA
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