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Smith KA, Zúñiga TM, Baker FL, Batatinha H, Pedlar CR, Burgess SC, Gustafson MP, Katsanis E, Simpson RJ. COVID-19 vaccination produces exercise-responsive SARS-CoV-2 specific T-cells regardless of infection history. JOURNAL OF SPORT AND HEALTH SCIENCE 2024; 13:99-107. [PMID: 37399887 PMCID: PMC10818112 DOI: 10.1016/j.jshs.2023.06.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2023] [Revised: 03/24/2023] [Accepted: 05/08/2023] [Indexed: 07/05/2023]
Abstract
BACKGROUND The mobilization and redistribution of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) specific T-cells and neutralizing antibodies (nAbs) during exercise is purported to increase immune surveillance and protect against severe coronavirus disease 2019 (COVID-19). We sought to determine if COVID-19 vaccination would elicit exercise-responsive SARS-CoV-2 T-cells and transiently alter nAb titers. METHODS Eighteen healthy participants completed a 20-min bout of graded cycling exercise before and/or after receiving a COVID-19 vaccine. All major leukocyte subtypes were enumerated before, during, and after exercise by flow cytometry, and immune responses to SARS-CoV-2 were determined using whole blood peptide stimulation assays, T-cell receptor (TCR)-β sequencing, and SARS-CoV-2 nAb serology. RESULTS COVID-19 vaccination had no effect on the mobilization or egress of major leukocyte subsets in response to intensity-controlled graded exercise. However, non-infected participants had a significantly reduced mobilization of CD4+ and CD8+ naive T-cells, as well as CD4+ central memory T-cells, after vaccination (synthetic immunity group); this was not seen after vaccination in those with prior SARS-CoV-2 infection (hybrid immunity group). Acute exercise after vaccination robustly mobilized SARS-CoV-2 specific T-cells to blood in an intensity-dependent manner. Both groups mobilized T-cells that reacted to spike protein; however, only the hybrid immunity group mobilized T-cells that reacted to membrane and nucleocapsid antigens. nAbs increased significantly during exercise only in the hybrid immunity group. CONCLUSION These data indicate that acute exercise mobilizes SARS-CoV-2 specific T-cells that recognize spike protein and increases the redistribution of nAbs in individuals with hybrid immunity.
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Affiliation(s)
- Kyle A Smith
- School of Nutritional Sciences and Wellness, The University of Arizona, Tucson, AZ 85721, USA
| | - Tiffany M Zúñiga
- School of Nutritional Sciences and Wellness, The University of Arizona, Tucson, AZ 85721, USA
| | - Forrest L Baker
- School of Nutritional Sciences and Wellness, The University of Arizona, Tucson, AZ 85721, USA; Department of Pediatrics, The University of Arizona, Tucson, AZ 85724, USA
| | - Helena Batatinha
- School of Nutritional Sciences and Wellness, The University of Arizona, Tucson, AZ 85721, USA
| | - Charles R Pedlar
- Faculty of Sport, Allied Health and Performance Science, St. Mary's University, Twickenham TW1 4SX, UK; Institute of Sport Exercise and Health, University College London, London WC1E 7HU, UK
| | - Shane C Burgess
- Department of Animal and Comparative Biomedical Sciences, The University of Arizona, Tucson, AZ 85721, USA; The University of Arizona Cancer Center, The University of Arizona, Tucson, AZ 85719, USA
| | - Michael P Gustafson
- Laboratory Medicine and Pathology, Mayo Clinic Arizona, Phoenix, AZ 85054, USA
| | - Emmanuel Katsanis
- Department of Pediatrics, The University of Arizona, Tucson, AZ 85724, USA; The University of Arizona Cancer Center, The University of Arizona, Tucson, AZ 85719, USA; Department of Immunobiology, The University of Arizona, Tucson, AZ 85724, USA; Department of Medicine, The University of Arizona, Tucson, AZ 85724, USA; Department of Pathology, The University of Arizona, Tucson, AZ 85724, USA
| | - Richard J Simpson
- School of Nutritional Sciences and Wellness, The University of Arizona, Tucson, AZ 85721, USA; Department of Pediatrics, The University of Arizona, Tucson, AZ 85724, USA; Department of Immunobiology, The University of Arizona, Tucson, AZ 85724, USA; Department of Medicine, The University of Arizona, Tucson, AZ 85724, USA.
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Wang L, Mao L, Xiao W, Chen P. Natural killer cells immunosenescence and the impact of lifestyle management. Biochem Biophys Res Commun 2023; 689:149216. [PMID: 37976836 DOI: 10.1016/j.bbrc.2023.149216] [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: 09/03/2023] [Revised: 10/28/2023] [Accepted: 11/03/2023] [Indexed: 11/19/2023]
Abstract
Natural killer cells (NKs) are lymphocytes of the innate immune system that quickly respond to viruses, infections, and tumors during their short cell life cycle. However, it was recently found that NKs undergo quantitative, distributional, structural, and functional phenotypic changes during aging that suppress immune responses, which is known as immunosenescence. The aging host environment, cytokine regulation, cytomegalovirus status, and hypothalamic‒pituitary‒adrenal axis have significant effects on NK function. Different lifestyle management interventions modulate the number and cytotoxic activity of NKs, which are essential for rebuilding the immune barrier against pathogens in elderly individuals. Based on recent studies, we review the phenotypic changes of and potential threats of NKs during aging and explore the underlying mechanisms. By summarizing the effects of lifestyle management on NKs and their application prospects, we aim to provide evidence for enhancing immune system function against immune diseases in elderly individuals.
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Affiliation(s)
- Lian Wang
- The Key Lab of Exercise and Health Sciences of Ministry of Education, Shanghai University of Sport, Shanghai, 200438, China; Shanghai Key Lab of Human Performance, Shanghai University of Sport, Shanghai, 200438, China.
| | - Liwei Mao
- The Key Lab of Exercise and Health Sciences of Ministry of Education, Shanghai University of Sport, Shanghai, 200438, China; Shanghai Key Lab of Human Performance, Shanghai University of Sport, Shanghai, 200438, China.
| | - Weihua Xiao
- The Key Lab of Exercise and Health Sciences of Ministry of Education, Shanghai University of Sport, Shanghai, 200438, China; Shanghai Key Lab of Human Performance, Shanghai University of Sport, Shanghai, 200438, China.
| | - Peijie Chen
- The Key Lab of Exercise and Health Sciences of Ministry of Education, Shanghai University of Sport, Shanghai, 200438, China; Shanghai Key Lab of Human Performance, Shanghai University of Sport, Shanghai, 200438, China.
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Hieber C, Grabbe S, Bros M. Counteracting Immunosenescence-Which Therapeutic Strategies Are Promising? Biomolecules 2023; 13:1085. [PMID: 37509121 PMCID: PMC10377144 DOI: 10.3390/biom13071085] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Revised: 07/03/2023] [Accepted: 07/05/2023] [Indexed: 07/30/2023] Open
Abstract
Aging attenuates the overall responsiveness of the immune system to eradicate pathogens. The increased production of pro-inflammatory cytokines by innate immune cells under basal conditions, termed inflammaging, contributes to impaired innate immune responsiveness towards pathogen-mediated stimulation and limits antigen-presenting activity. Adaptive immune responses are attenuated as well due to lowered numbers of naïve lymphocytes and their impaired responsiveness towards antigen-specific stimulation. Additionally, the numbers of immunoregulatory cell types, comprising regulatory T cells and myeloid-derived suppressor cells, that inhibit the activity of innate and adaptive immune cells are elevated. This review aims to summarize our knowledge on the cellular and molecular causes of immunosenescence while also taking into account senescence effects that constitute immune evasion mechanisms in the case of chronic viral infections and cancer. For tumor therapy numerous nanoformulated drugs have been developed to overcome poor solubility of compounds and to enable cell-directed delivery in order to restore immune functions, e.g., by addressing dysregulated signaling pathways. Further, nanovaccines which efficiently address antigen-presenting cells to mount sustained anti-tumor immune responses have been clinically evaluated. Further, senolytics that selectively deplete senescent cells are being tested in a number of clinical trials. Here we discuss the potential use of such drugs to improve anti-aging therapy.
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Affiliation(s)
- Christoph Hieber
- Department of Dermatology, University Medical Center of the Johannes Gutenberg-University Mainz, Langenbeckstraße 1, 55131 Mainz, Germany
- Institute of Molecular Biology (IMB), Ackermannweg 4, 55128 Mainz, Germany
| | - Stephan Grabbe
- Department of Dermatology, University Medical Center of the Johannes Gutenberg-University Mainz, Langenbeckstraße 1, 55131 Mainz, Germany
- Institute of Molecular Biology (IMB), Ackermannweg 4, 55128 Mainz, Germany
| | - Matthias Bros
- Department of Dermatology, University Medical Center of the Johannes Gutenberg-University Mainz, Langenbeckstraße 1, 55131 Mainz, Germany
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4
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Boeira MCDR, Dorneles GP, Junior WF, Peres A. The influence of physical activity level and cytomegalovirus serostatus on the cytokine levels of young individuals. Immunol Lett 2023; 256-257:28-33. [PMID: 36996911 DOI: 10.1016/j.imlet.2023.03.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2023] [Revised: 03/21/2023] [Accepted: 03/27/2023] [Indexed: 03/30/2023]
Abstract
The practice of physical activity (PA) is a non-pharmacological variable that alters the immune response through changes in cytokines and cellular immunity. Inversely latent cytomegalovirus (CMV) infection prematurely ages the immune system and contributes to the chronic inflammatory condition in several diseases and in aging. This study aimed to compare the association of the PA level and CMV serostatus on whole blood mitogen-stimulated cytokine production of young individuals. The resting blood samples were collected from 100 volunteers of both sexes assigned to one of six groups according to the degree of PA and CMV serostatus: sedentary CMV- (n = 15), moderate physical activity CMV- (moderate PA CMV -, n = 15), high physical activity CMV- (high PA CMV-, n = 15), sedentary CMV+ (n = 20), moderate physical activity CMV + (moderate PA CMV+, n = 20) and high physical activity CMV + (high PA CMV +, n = 20). The collected peripheral blood got diluted in supplemented RPMI-1640 culture medium and incubated for 48 hours with a 2% concentration of phytohemagglutinin at 37ºC and CO2 at 5%. The supernatants were collected and used for the IL-6, IL-10, TNF-α, and INF-γ analysis by the ELISA method. The IL-10 concentration was higher in the Moderate PA and High PA groups when compared to the sedentary group, regardless of CMV status. The physically active (moderate and high PA) CMV+ individuals presented lower concentrations of IL-6 and TNF-α compared to CMV+ sedentary individuals, and the sedentary CMV+ subjects had a higher concentration of INF-γ compared to Sedentary CMV- subjects (p < 0.05). In summary, it is possible to infer that PA is key to controlling inflammation related to CMV infection. The stimulation of physical exercise is an important factor in controlling many diseases at the populational level.
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5
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Padilha CS, Von Ah Morano AE, Krüger K, Rosa-Neto JC, Lira FS. The growing field of immunometabolism and exercise: Key findings in the last 5 years. J Cell Physiol 2022; 237:4001-4020. [PMID: 36052887 DOI: 10.1002/jcp.30866] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Revised: 07/04/2022] [Accepted: 08/16/2022] [Indexed: 11/09/2022]
Abstract
This perspective review highlights the impact of physical exercise on immunometabolic responses in the past 5 years. Understanding immunometabolism as a part of immunological research is essential. Furthermore, the roles of both acute and chronic effects of physical exercise on health, aging, and chronic diseases in immunometabolic changes should be elaborated. In immune cells, β2 adrenergic signaling stimulates the preferential mobilization of inflammatory phenotypes, such as CD16+ monocytes and CD8+ T cells, into the bloodstream after a physical exercise session. The mobilization of immune cells is closely related to the availability of energetic substrates for the cell and mechanisms associated with the uptake and oxidation of fatty acids and glucose. These cells, especially senescent T cells, are mobilized to the peripheral tissues and undergo apoptotic signaling, stimulating the creation of a "vacant space" where new cells will be matured and replaced in the circulation. This results in the upregulation of the expression and secretion of anti-inflammatory cytokines (IL-10 and IL-1ra), leading to increased regulatory immune cells that provide immunoregulatory properties. Thus, we suggest that a significant nutrient available to the cell will favor oxidative metabolism, augment ATP production, and consequently maintain the immune cells in their quiescent state, as well as promote rapid activation function. Therefore, based on the studies discussed in this perspective review, we highlight the importance of performing moderate-intensity continuous and high-intensity intermittent aerobic exercises, due to a higher magnitude of energetic demand and release of anti-inflammatory cytokines (IL-6 and IL-10).
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Affiliation(s)
- Camila S Padilha
- Exercise and Immunometabolism Research Group, Postgraduation Program in Movement Sciences, Department of Physical Education, Universidade Estadual Paulista (UNESP), Presidente Prudente, Brazil
| | - Ana E Von Ah Morano
- Exercise and Immunometabolism Research Group, Postgraduation Program in Movement Sciences, Department of Physical Education, Universidade Estadual Paulista (UNESP), Presidente Prudente, Brazil.,Department of Physical Education, Post-Graduate Program in Movement Sciences, Laboratory of InVestigation in Exercise, Scientific Research Group Related to Physical Activity, Sao Paulo State University, Presidente Prudente, São Paulo, Brazil
| | - Karsten Krüger
- Department of Exercise Physiology and Sports Therapy, Institute of Sports Science, University of Giessen, Giessen, Germany
| | - José C Rosa-Neto
- Immunometabolism Research Group, E LIM-26, University of São Paulo, São Paulo-SP, Brazil
| | - Fabio S Lira
- Exercise and Immunometabolism Research Group, Postgraduation Program in Movement Sciences, Department of Physical Education, Universidade Estadual Paulista (UNESP), Presidente Prudente, Brazil.,Faculty of Sports Science and Physical Education, Research Center for Sports and Physical Activity, University of Coimbra, Coimbra, Portugal
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6
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Simpson RJ, Boßlau TK, Weyh C, Niemiro GM, Batatinha H, Smith KA, Krüger K. Exercise and adrenergic regulation of immunity. Brain Behav Immun 2021; 97:303-318. [PMID: 34302965 DOI: 10.1016/j.bbi.2021.07.010] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Revised: 06/07/2021] [Accepted: 07/16/2021] [Indexed: 12/14/2022] Open
Abstract
Exercise training has a profound impact on immunity, exerting a multitude of positive effects in indications such as immunosenescence, cancer, viral infections and inflammatory diseases. The immune, endocrine and central nervous systems work in a highly synergistic manner and it has become apparent that catecholamine signaling through leukocyte β-adrenergic receptors (β-ARs) is a key mechanism by which exercise mediates improvements in immune function to help mitigate numerous disease conditions. Central to this is the preferential mobilization and redistribution of effector lymphocytes with potent anti-viral and anti-tumor activity, their interaction with muscle-derived cytokines, and the effects of catecholamine signaling on mitochondrial biogenesis, immunometabolism and the resulting inflammatory response. Here, we review the impact of acute and chronic exercise on adrenergic regulation of immunity in the context of aging, cancer, viral infections and inflammatory disease. We also put forth our contention that exercise interventions designed to improve immunity, prevent disease and reduce inflammation should consider the catecholamine-AR signaling axis as a therapeutic target and ask whether or not the adrenergic signaling machinery can be 'trained' to improve immune responses to stress, disease or during the normal physiological process of aging. Finally, we discuss potential strategies to augment leukocyte catecholamine signaling to boost the effects of exercise on immunity in individuals with desensitized β-ARs or limited exercise tolerance.
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Affiliation(s)
- Richard J Simpson
- University of Arizona, Department of Nutritional Sciences, Tucson, AZ, USA; University of Arizona, Department of Pediatrics, Tucson, AZ, USA; University of Arizona, Department of Immunobiology, Tucson, AZ, USA; University of Arizona Cancer Center, Tucson, AZ, USA.
| | - Tim K Boßlau
- University of Gießen, Department of Exercise Physiology and Sports Therapy, Gießen, Germany
| | - Christopher Weyh
- University of Gießen, Department of Exercise Physiology and Sports Therapy, Gießen, Germany
| | - Grace M Niemiro
- University of Arizona, Department of Pediatrics, Tucson, AZ, USA; University of Arizona Cancer Center, Tucson, AZ, USA
| | - Helena Batatinha
- University of Arizona, Department of Pediatrics, Tucson, AZ, USA
| | - Kyle A Smith
- University of Arizona, Department of Nutritional Sciences, Tucson, AZ, USA; University of Arizona, Department of Pediatrics, Tucson, AZ, USA
| | - Karsten Krüger
- University of Gießen, Department of Exercise Physiology and Sports Therapy, Gießen, Germany.
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7
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Cho E, Theall B, Stampley J, Granger J, Johannsen NM, Irving BA, Spielmann G. Cytomegalovirus Infection Impairs the Mobilization of Tissue-Resident Innate Lymphoid Cells into the Peripheral Blood Compartment in Response to Acute Exercise. Viruses 2021; 13:v13081535. [PMID: 34452400 PMCID: PMC8402764 DOI: 10.3390/v13081535] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Revised: 07/24/2021] [Accepted: 07/29/2021] [Indexed: 11/25/2022] Open
Abstract
Circulating immune cell numbers and phenotypes are impacted by high-intensity acute bouts of exercise and infection history with the latent herpesviruses cytomegalovirus (CMV). In particular, CMV infection history impairs the exercise-induced mobilization of cytotoxic innate lymphoid cells 1 (ILC1) cells, also known as NK cells, in the blood. However, it remains unknown whether exercise and CMV infection modulate the mobilization of traditionally tissue-resident non-cytotoxic ILCs into the peripheral blood compartment. To address this question, 22 healthy individuals with or without CMV (20–35 years—45% CMVpos) completed 30 min of cycling at 70% VO2 max, and detailed phenotypic analysis of circulating ILCs was performed at rest and immediately post-exercise. We show for the first time that a bout of high-intensity exercise is associated with an influx of ILCs that are traditionally regarded as tissue-resident. In addition, this is the first study to highlight that latent CMV infection blunts the exercise-response of total ILCs and progenitor ILCs (ILCPs). These promising data suggest that acute exercise facilitates the circulation of certain ILC subsets, further advocating for the improvements in health seen with exercise by enhancing cellular mobilization and immunosurveillance, while also highlighting the indirect deleterious effects of CMV infection in healthy adults.
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Affiliation(s)
- Eunhan Cho
- School of Kinesiology, Louisiana State University, Baton Rouge, LA 70803, USA; (E.C.); (B.T.); (J.S.); (J.G.); (N.M.J.); (B.A.I.)
| | - Bailey Theall
- School of Kinesiology, Louisiana State University, Baton Rouge, LA 70803, USA; (E.C.); (B.T.); (J.S.); (J.G.); (N.M.J.); (B.A.I.)
| | - James Stampley
- School of Kinesiology, Louisiana State University, Baton Rouge, LA 70803, USA; (E.C.); (B.T.); (J.S.); (J.G.); (N.M.J.); (B.A.I.)
| | - Joshua Granger
- School of Kinesiology, Louisiana State University, Baton Rouge, LA 70803, USA; (E.C.); (B.T.); (J.S.); (J.G.); (N.M.J.); (B.A.I.)
| | - Neil M. Johannsen
- School of Kinesiology, Louisiana State University, Baton Rouge, LA 70803, USA; (E.C.); (B.T.); (J.S.); (J.G.); (N.M.J.); (B.A.I.)
- Pennington Biomedical Research Center, Baton Rouge, LA 70808, USA
| | - Brian A. Irving
- School of Kinesiology, Louisiana State University, Baton Rouge, LA 70803, USA; (E.C.); (B.T.); (J.S.); (J.G.); (N.M.J.); (B.A.I.)
- Pennington Biomedical Research Center, Baton Rouge, LA 70808, USA
| | - Guillaume Spielmann
- School of Kinesiology, Louisiana State University, Baton Rouge, LA 70803, USA; (E.C.); (B.T.); (J.S.); (J.G.); (N.M.J.); (B.A.I.)
- Pennington Biomedical Research Center, Baton Rouge, LA 70808, USA
- Correspondence:
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8
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Can physical activity ameliorate immunosenescence and thereby reduce age-related multi-morbidity? Nat Rev Immunol 2019; 19:563-572. [DOI: 10.1038/s41577-019-0177-9] [Citation(s) in RCA: 181] [Impact Index Per Article: 36.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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9
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Bigley AB, Agha NH, Baker FL, Spielmann G, Kunz HE, Mylabathula PL, Rooney BV, Laughlin MS, Mehta SK, Pierson DL, Crucian BE, Simpson RJ. NK cell function is impaired during long-duration spaceflight. J Appl Physiol (1985) 2018; 126:842-853. [PMID: 30382809 DOI: 10.1152/japplphysiol.00761.2018] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Maintaining astronaut health during space travel is paramount for further human exploration of the solar system beyond Earth's orbit. Of concern are potential dysregulations in immunity, which could increase the likelihood of cancer and latent viral reactivation. Natural killer (NK) cells are critical effectors of the innate immune system, and their function and phenotype are important to immunosurveillance of nascent tumors and latent viral infections. We compared changes in NK cell phenotype and function in eight crew members who completed an ~6-mo mission to the International Space Station (ISS) with healthy controls who remained on Earth. Assessments were made before (180 and 60 days before launch), during [flight day + 90 days (FD+90) and 1 day before return (R-1)], and after the mission (at R+0, R+18, R+33, and R+66). These samples, plus an additional in-flight sample (FD+180), were collected from a crew member who spent 340 days (~1 yr) on the ISS. NK cell cytotoxic activity (NKCA) against K562 leukemia targets in vitro was reduced by ~50% at FD+90 in ISS crew but not controls. This decrease was more pronounced in "rookie" compared with "veteran" crew members. The ~1-yr mission crew member did not show declines in NKCA against K562 until late in the mission (R-1 and R+0). NK cell numbers, expression of activating and inhibitory receptors, target cell binding, and expression and degranulation of perforin and granzyme B were unaltered with spaceflight. Similarly, when we exposed an immortalized NK cell line (NK-92) to sera collected at different mission time points (before, during, and after flight), there was no effect on NKCA. This is the first study to report impaired NK cell function during long-duration space travel. Countermeasures may be needed to mitigate immune system impairment in exploration class mission crew during long-duration spaceflight missions. NEW & NOTEWORTHY Immune system impairment may inhibit future human space exploration missions to Mars. Natural killer (NK) cells are key components of immunity and vital for tumor surveillance and the prevention of latent virus reactivation. We report that NK cell function is impaired in astronauts during an ~6-mo orbital space mission compared with preflight levels and ground-based controls. Declines in NK cell function were more marked in first-time "rookie" fliers. Countermeasures are needed to preserve NK cell-mediated immunity during spaceflight.
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Affiliation(s)
- Austin B Bigley
- Department of Nutritional Sciences, The University of Arizona , Tucson, Arizona.,Laboratory of Integrated Physiology, Department of Health and Human Performance, University of Houston , Houston, Texas
| | - Nadia H Agha
- Laboratory of Integrated Physiology, Department of Health and Human Performance, University of Houston , Houston, Texas
| | - Forrest L Baker
- Department of Nutritional Sciences, The University of Arizona , Tucson, Arizona.,Laboratory of Integrated Physiology, Department of Health and Human Performance, University of Houston , Houston, Texas.,Department of Pediatrics, The University of Arizona , Tucson, Arizona
| | - Guillaume Spielmann
- Laboratory of Integrated Physiology, Department of Health and Human Performance, University of Houston , Houston, Texas.,School of Kinesiology, Louisiana State University , Baton Rouge, Louisiana
| | - Hawley E Kunz
- Laboratory of Integrated Physiology, Department of Health and Human Performance, University of Houston , Houston, Texas.,National Aeronautics and Space Administration Johnson Space Center , Houston, Texas
| | - Preteesh L Mylabathula
- Department of Nutritional Sciences, The University of Arizona , Tucson, Arizona.,Laboratory of Integrated Physiology, Department of Health and Human Performance, University of Houston , Houston, Texas.,Department of Pediatrics, The University of Arizona , Tucson, Arizona
| | - Bridgette V Rooney
- Laboratory of Integrated Physiology, Department of Health and Human Performance, University of Houston , Houston, Texas.,National Aeronautics and Space Administration Johnson Space Center , Houston, Texas
| | - Mitzi S Laughlin
- Laboratory of Integrated Physiology, Department of Health and Human Performance, University of Houston , Houston, Texas
| | - Satish K Mehta
- National Aeronautics and Space Administration Johnson Space Center , Houston, Texas
| | - Duane L Pierson
- National Aeronautics and Space Administration Johnson Space Center , Houston, Texas
| | - Brian E Crucian
- National Aeronautics and Space Administration Johnson Space Center , Houston, Texas
| | - Richard J Simpson
- Department of Nutritional Sciences, The University of Arizona , Tucson, Arizona.,Laboratory of Integrated Physiology, Department of Health and Human Performance, University of Houston , Houston, Texas.,Department of Pediatrics, The University of Arizona , Tucson, Arizona.,Department of Immunobiology, The University of Arizona , Tucson, Arizona
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10
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Li Y, Huang K, Liu L, Qu Y, Huang Y, Wu Y, Wei J. Effects of complement and serum IgG on rituximab-dependent natural killer cell-mediated cytotoxicity against Raji cells. Oncol Lett 2018; 17:339-347. [PMID: 30655772 PMCID: PMC6313095 DOI: 10.3892/ol.2018.9630] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2017] [Accepted: 10/04/2018] [Indexed: 12/24/2022] Open
Abstract
Accumulating evidence indicates that the anti-CD20 monoclonal antibody rituximab significantly improves the clinical prognosis of patients with non-Hodgkin lymphoma and chronic lymphocytic leukemia. However, a number of patients relapse or fail to respond to rituximab. To further understand the cause of this, polymorphisms of FcγRIIIa were initially detected in healthy volunteers. Subsequently, the rituximab-dependent natural killer (NK) cell-mediated cytotoxicity of different FcγRIIIa genotypes was assessed by a cytotoxicity assay in vitro. Ultimately, the effect of human serum immunoglobulin (Ig) G and complement on rituximab-dependent NK cell-mediated cytotoxicity was evaluated in vitro. It was revealed that FcγRIIIa polymorphisms were associated with the antibody-dependent cell-mediated cytotoxicity (ADCC) of NK cells. In addition, the ADCC of NK cells with FcγRIIIa-158 V/V was increased compared with that of FcγRIIIa-158 V/F. The serum IgG and rituximab Fc segment was able to bind competitively with NK cell FcγRIIIa. It was observed that serum IgG inhibited, whereas complement enhanced rituximab-induced NK-cell mediated ADCC. Therefore, various agents administered synchronously with rituximab may modulate the efficacy of this agent and ultimately its toxicity against tumor cells.
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Affiliation(s)
- Yang Li
- Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, Guangdong 510120, P.R. China.,Department of Pediatric Hematology/Oncology, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, Guangdong 510120, P.R. China
| | - Ke Huang
- Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, Guangdong 510120, P.R. China.,Department of Pediatric Hematology/Oncology, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, Guangdong 510120, P.R. China
| | - Ling Liu
- Department of Pediatric, Affiliatied Hospital of Guangdong Medical University, Zhanjiang, Guangdong 524000, P.R. China
| | - Yuhua Qu
- Department of Pediatrics, Guang Zhou Women and Children's Medical Center, Guangzhou, Guangdong 510120, P.R. China
| | - Yan Huang
- Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, Guangdong 510120, P.R. China.,Department of Pediatric Hematology/Oncology, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, Guangdong 510120, P.R. China
| | - Yanfeng Wu
- Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, Guangdong 510120, P.R. China.,Biotherapy Center, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, Guangdong 510120, P.R. China
| | - Jing Wei
- Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, Guangdong 510120, P.R. China.,Medical Research Center, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, Guangdong 510120, P.R. China
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Sellami M, Gasmi M, Denham J, Hayes LD, Stratton D, Padulo J, Bragazzi N. Effects of Acute and Chronic Exercise on Immunological Parameters in the Elderly Aged: Can Physical Activity Counteract the Effects of Aging? Front Immunol 2018; 9:2187. [PMID: 30364079 PMCID: PMC6191490 DOI: 10.3389/fimmu.2018.02187] [Citation(s) in RCA: 110] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2018] [Accepted: 09/04/2018] [Indexed: 12/22/2022] Open
Abstract
Immunosenescence is characterized by deterioration of the immune system caused by aging which induces changes to innate and adaptive immunity. Immunosenescence affects function and phenotype of immune cells, such as expression and function of receptors for immune cells which contributes to loss of immune function (chemotaxis, intracellular killing). Moreover, these alterations decrease the response to pathogens, which leads to several age-related diseases including cardiovascular disease, Alzheimer's disease, and diabetes in older individuals. Furthermore, increased risk of autoimmune disease and chronic infection is increased with an aging immune system, which is characterized by a pro-inflammatory environment, ultimately leading to accelerated biological aging. During the last century, sedentarism rose dramatically, with a concomitant increase in certain type of cancers (such as breast cancer, colon, or prostate cancer), and autoimmune disease. Numerous studies on physical activity and immunity, with focus on special populations (i.e., people with diabetes, HIV patients) demonstrate that chronic exercise enhances immunity. However, the majority of previous work has focused on either a pathological population or healthy young adults whilst research in elderly populations is scarce. Research conducted to date has primarily focused on aerobic and resistance exercise training and its effect on immunity. This review focuses on the potential for exercise training to affect the aging immune system. The concept is that some lifestyle strategies such as high-intensity exercise training may prevent disease through the attenuation of immunosenescence. In this context, we take a top-down approach and review the effect of exercise and training on immunological parameters in elderly at rest and during exercise in humans, and how they respond to different modes of training. We highlight the impact of these different exercise modes on immunological parameters, such as cytokine and lymphocyte concentration in elderly individuals.
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Affiliation(s)
- Maha Sellami
- Sport Science Program (SSP), College of Arts and Sciences (QU-CAS), University of Qatar, Doha, Qatar
| | - Maha Gasmi
- Higher Institute of Sport and Physical Education of Ksar Said, Mannouba, Tunisia
| | - Joshua Denham
- School of Health and Biomedical Sciences, RMIT University, Melbourne, VIC, Australia
| | - Lawrence D Hayes
- Active Ageing Research Group, Department of Medical and Sport Sciences, University of Cumbria, Lancaster, United Kingdom
| | - Dan Stratton
- Cellular and Molecular Immunology Research Center, London Metropolitan University, London, United Kingdom
| | | | - Nicola Bragazzi
- Department of Health Sciences (DISSAL), Postgraduate School of Public Health, University of Genoa, Genoa, Italy
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12
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Ross M, Ingram L, Taylor G, Malone E, Simpson RJ, West D, Florida‐James G. Older men display elevated levels of senescence-associated exercise-responsive CD28 null angiogenic T cells compared with younger men. Physiol Rep 2018; 6:e13697. [PMID: 29939490 PMCID: PMC6016626 DOI: 10.14814/phy2.13697] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2018] [Revised: 04/03/2018] [Accepted: 04/06/2018] [Indexed: 12/19/2022] Open
Abstract
Aging is associated with elevated cardiovascular disease risk. As a result of aging, endothelial dysfunction develops, partly due to a reduction in vascular regenerative ability. CD31+ T cells (angiogenic T cells; TANG ) possess highly angiogenic capabilities; however, these cells are significantly reduced in older populations. In addition, older populations possess significantly higher senescent and highly differentiated T-cell levels in circulation, and these are reported to be highly exercise responsive. We investigated whether older adults display greater levels of circulating senescent (CD28null ) TANG cells and whether these cells were more exercise responsive than CD28+ TANG cells. Young (18-25 years; n = 9) and older (60-75 years; n = 10) healthy men undertook a 30-min cycling bout at 70% V˙O2 peak, with circulating TANG cells (CD3+ CD31+ CD28+/null ; including CD4+ and CD8+ subsets) measured preexercise, postexercise, and 1 h post exercise by flow cytometry. Older adults displayed reduced basal levels of TANG cells (mean ± SEM: 410 ± 81 vs. 784 ± 118 cells·μL, P = 0.017), despite a greater proportion of these cells being CD28null (26.26 ± 5.08 vs. 13.36 ± 2.62%, P = 0.044). Exercise significantly increased the circulating number of TANG cells in both young and older men. However, in older men alone, exercise preferentially mobilized CD28null CD8+ TANG cells compared with CD28+ TANG cells (time × phenotype interaction: P = 0.022; Δ74 ± 29 vs. Δ27 ± 15 cells·μL, P = 0.059), with no such difference observed between these phenotypes in the young population. In conclusion, this is the first study to demonstrate that despite observing lower circulating numbers of TANG cells, older adults display greater levels of senescent TANG cells in comparison with younger individuals, and these cells are more exercise responsive than CD28+ TANG cells. Lower number of circulating TANG and greater levels of senescent-associated CD28null TANG may contribute to greater CVD risk with advancing age.
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Affiliation(s)
- Mark Ross
- School of Applied SciencesEdinburgh Napier UniversityEdinburghUnited Kingdom
| | - Lesley Ingram
- School of Applied SciencesEdinburgh Napier UniversityEdinburghUnited Kingdom
| | - Guy Taylor
- Institute of Cellular MedicineNewcastle UniversityNewcastleUnited Kingdom
| | - Eva Malone
- School of Applied SciencesEdinburgh Napier UniversityEdinburghUnited Kingdom
| | - Richard J. Simpson
- Department of Nutritional SciencesDepartment of PediatricsDepartment of ImmunobiologyThe University of ArizonaTucsonArizona
| | - Dan West
- Institute of Cellular MedicineNewcastle UniversityNewcastleUnited Kingdom
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13
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Ross MD, Malone EM, Simpson R, Cranston I, Ingram L, Wright GP, Chambers G, Florida-James G. Lower resting and exercise-induced circulating angiogenic progenitors and angiogenic T cells in older men. Am J Physiol Heart Circ Physiol 2017; 314:H392-H402. [PMID: 29167123 DOI: 10.1152/ajpheart.00592.2017] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Aging is associated with a dysfunctional endothelial phenotype as well as reduced angiogenic capabilities. Exercise exerts beneficial effects on the cardiovascular system, possibly by increasing/maintaining the number and/or function of circulating angiogenic cells (CACs), which are known to decline with age. However, the relationship between cardiorespiratory fitness (CRF) and age-related changes in the frequency of CACs, as well as the exercise-induced responsiveness of CACs in older individuals, has not yet been determined. One-hundred seven healthy male volunteers, aged 18-75 yr, participated in study 1. CRF was estimated using a submaximal cycling ergometer test. Circulating endothelial progenitor cells (EPCs), angiogenic T cells (TANG), and their chemokine (C-X-C motif) receptor 4 (CXCR4) cell surface receptor expression were enumerated by flow cytometry using peripheral blood samples obtained under resting conditions before the exercise test. In study 2, 17 healthy men (8 young men, 18-25 yr; 9 older men, 60-75 yr) were recruited, and these participants undertook a 30-min cycling exercise bout at 70% maximal O2 consumption, with CACs enumerated before and immediately after exercise. Age was inversely associated with both CD34+ progenitor cells ( r2 = -0.140, P = 0.000) and TANG ( r2 = -0.176, P = 0.000) cells as well as CXCR4-expressing CACs (CD34+: r2 = -0.167, P = 0.000; EPCs: r2 = -0.098, P = 0.001; TANG: r2 = -0.053, P = 0.015). However, after correcting for age, CRF had no relationship with either CAC subset. In addition, older individuals displayed attenuated exercise-induced increases in CD34+ progenitor cells, TANG, CD4+, TANG, and CD8+CXCR4+ TANG cells. Older men display lower CAC levels, which may contribute to increased risk of cardiovascular disease, and older adults display an impaired exercise-induced responsiveness of these cells. NEW & NOTEWORTHY Older adults display lower circulating progenitor cell and angiogenic T cell counts compared with younger individuals independently of cardiometabolic risk factors and cardiorespiratory fitness. Older adults also display impaired exercise-induced mobilization of these vasculogenic cells.
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Affiliation(s)
- Mark D Ross
- School of Applied Sciences, Edinburgh Napier University , Edinburgh , United Kingdom
| | - Eva M Malone
- School of Applied Sciences, Edinburgh Napier University , Edinburgh , United Kingdom
| | - Richard Simpson
- Department of Nutritional Sciences, College of Agriculture and Life Sciences, University of Arizona , Tucson, Arizona.,Department of Pediatrics, College of Medicine, University of Arizona , Tucson, Arizona
| | - Islay Cranston
- School of Applied Sciences, Edinburgh Napier University , Edinburgh , United Kingdom
| | - Lesley Ingram
- School of Applied Sciences, Edinburgh Napier University , Edinburgh , United Kingdom
| | - Graham P Wright
- School of Applied Sciences, Edinburgh Napier University , Edinburgh , United Kingdom
| | - George Chambers
- School of Applied Sciences, Edinburgh Napier University , Edinburgh , United Kingdom
| | - Geraint Florida-James
- School of Applied Sciences, Edinburgh Napier University , Edinburgh , United Kingdom
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14
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van der Geest KSM, Wang Q, Eijsvogels TMH, Koenen HJP, Joosten I, Brouwer E, Hopman MTE, Jacobs JFM, Boots AMH. Changes in peripheral immune cell numbers and functions in octogenarian walkers - an acute exercise study. IMMUNITY & AGEING 2017; 14:5. [PMID: 28250797 PMCID: PMC5322590 DOI: 10.1186/s12979-017-0087-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/02/2016] [Accepted: 02/16/2017] [Indexed: 12/26/2022]
Abstract
BACKGROUND Age-related changes of the immune system, termed immunosenescence, may underlie the increased risk of infections and morbidity in the elderly. Little is known about the effects of acute exercise on peripheral immune parameters in octogenarians. Therefore, we investigated acute exercise-induced changes in phenotype and function of the immune system in octogenarians participating in the 2013 edition of the Nijmegen Four Days Marches. Blood sampling was performed at baseline and immediately after 4 days of the walking exercise (30 km/day). A comprehensive set of adaptive and innate immune traits were enumerated and analyzed by flow-cytometry. Peripheral blood mononuclear cells, isolated before and after walking were stimulated with LPS and supernatants were analysed for IL-1β, IL-6, IL-8 and TNF-α concentrations by ELISA. CMV serostatus was determined by ELISA. RESULTS The walking exercise induced a clear leucocytosis with numerical increases of granulocytes, monocytes and lymphocytes. These exercise-induced changes were most profound in CMV seropositive subjects. Within lymphocytes, numerical increases of particularly CD4+ T cells were noted. Further T cell differentiation analysis revealed profound increases of naïve CD4+ T cells, including naïve Treg. Significant increases were also noted for CD4+ memory T cell subsets. In contrast, only slight increases in naïve and memory CD8+ T cell subsets were detected. Exercise did not affect markers of immune exhaustion in memory T cell subsets. NK cells demonstrated a numerical decline and a change in cellular composition with a selective decrease of the mature CD56dim NK cells. The latter was seen in CMV seronegative subjects only. Also, a higher IL-6 and IL-8 production capacity of LPS-stimulated PBMC was seen after walking. CONCLUSION In this exceptional cohort of octogenarian walkers, acute exercise induced changes in immune cell numbers and functions. A clear response of CD4+ T cells, rather than CD8+ T cells or NK cells was noted. Remarkably, the response to exercise within the CD4+ T cell compartment was dominated by naïve CD4+ subsets.
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Affiliation(s)
- Kornelis S M van der Geest
- Departments of Rheumatology and Clinical Immunology and Translational Immunology Groningen (TRIGR), University of Groningen, University Medical Center Groningen, Hanzeplein 1, 9700RB Groningen, The Netherlands
| | - Qi Wang
- Departments of Rheumatology and Clinical Immunology and Translational Immunology Groningen (TRIGR), University of Groningen, University Medical Center Groningen, Hanzeplein 1, 9700RB Groningen, The Netherlands
| | - Thijs M H Eijsvogels
- Department of Physiology, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Hans J P Koenen
- Department of Laboratory Medicine, Laboratory Medical Immunology, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Irma Joosten
- Department of Laboratory Medicine, Laboratory Medical Immunology, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Elisabeth Brouwer
- Departments of Rheumatology and Clinical Immunology and Translational Immunology Groningen (TRIGR), University of Groningen, University Medical Center Groningen, Hanzeplein 1, 9700RB Groningen, The Netherlands
| | - Maria T E Hopman
- Department of Physiology, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Joannes F M Jacobs
- Department of Laboratory Medicine, Laboratory Medical Immunology, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Annemieke M H Boots
- Departments of Rheumatology and Clinical Immunology and Translational Immunology Groningen (TRIGR), University of Groningen, University Medical Center Groningen, Hanzeplein 1, 9700RB Groningen, The Netherlands
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15
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Lopez-Sejas N, Campos C, Hassouneh F, Sanchez-Correa B, Tarazona R, Pera A, Solana R. Effect of CMV and Aging on the Differential Expression of CD300a, CD161, T-bet, and Eomes on NK Cell Subsets. Front Immunol 2016; 7:476. [PMID: 27872625 PMCID: PMC5097920 DOI: 10.3389/fimmu.2016.00476] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2016] [Accepted: 10/19/2016] [Indexed: 12/27/2022] Open
Abstract
Natural killer (NK) cells are innate lymphoid cells involved in the defense against virus-infected cells and tumor cells. NK cell phenotype and function is affected with age and cytomegalovirus (CMV) latent infection. Aging affects the frequency and phenotype of NK cells, and CMV infection also contributes to these alterations. Thus, a reduction of CD56bright NK cell subpopulation associated with age and an expansion of memory-like NK cells CD56dimCD57+NKG2C+ probably related to CMV seropositivity have been described. NK cells express T-bet and Eomes transcription factors that are necessary for the development of NK cells. Here, we analyze the effect of age and CMV seropositivity on the expression of CD300a and CD161 inhibitory receptors, and T-bet and Eomes transcription factors in NK cell subsets defined by the expression of CD56 and CD57. CD300a is expressed by the majority of NK cells. CD56bright NK cells express higher levels of CD300a than CD56dim NK cells. An increase in the expression of CD300a was associated with age, whereas a decreased expression of CD161 in CD56dim NK cells was associated with CMV seropositivity. In CD56dim NK cells, an increased percentage of CD57+CD300a+ and a reduction in the percentage of CD161+CD300a+ cells were found to be associated with CMV seropositivity. Regarding T-bet and Eomes transcription factors, CMV seropositivity was associated with a decrease of T-bethi in CD56dimCD57+ NK cells from young individuals, whereas Eomes expression was increased with CMV seropositivity in both CD56bright and CD56dimCD57+/− (from middle age and young individuals, respectively) and was decreased with aging in all NK subsets from the three group of age. In conclusion, CMV infection and age induce significant changes in the expression of CD300a and CD161 in NK cell subsets defined by the expression of CD56 and CD57. T-bet and Eomes are differentially expressed on NK cell subsets, and their expression is affected by CMV latent infection and aging.
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Affiliation(s)
- Nelson Lopez-Sejas
- Maimonides Biomedicine Institute of Cordoba (IMIBIC), Reina Sofia Hospital, University of Cordoba , Cordoba , Spain
| | - Carmen Campos
- Maimonides Biomedicine Institute of Cordoba (IMIBIC), Reina Sofia Hospital, University of Cordoba , Cordoba , Spain
| | - Fakhri Hassouneh
- Maimonides Biomedicine Institute of Cordoba (IMIBIC), Reina Sofia Hospital, University of Cordoba , Cordoba , Spain
| | | | - Raquel Tarazona
- Immunology Unit, Department of Physiology, University of Extremadura , Cáceres , Spain
| | - Alejandra Pera
- Maimonides Biomedicine Institute of Cordoba (IMIBIC), Reina Sofia Hospital, University of Cordoba , Cordoba , Spain
| | - Rafael Solana
- Maimonides Biomedicine Institute of Cordoba (IMIBIC), Reina Sofia Hospital, University of Cordoba , Cordoba , Spain
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16
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Müller-Durovic B, Lanna A, Covre LP, Mills RS, Henson SM, Akbar AN. Killer Cell Lectin-like Receptor G1 Inhibits NK Cell Function through Activation of Adenosine 5'-Monophosphate-Activated Protein Kinase. THE JOURNAL OF IMMUNOLOGY 2016; 197:2891-2899. [PMID: 27566818 DOI: 10.4049/jimmunol.1600590] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2016] [Accepted: 08/01/2016] [Indexed: 01/10/2023]
Abstract
NK cells are the first line of defense against infected and transformed cells. Defective NK cell activity was shown to increase susceptibility for viral infections and reduce tumor immune-surveillance. With age, the incidence of infectious diseases and malignancy rises dramatically, suggesting that impaired NK cell function might contribute to disease in these individuals. We found an increased frequency of NK cells with high expression of the inhibitory killer cell lectin-like receptor G1 (KLRG1) in individuals >70 y. The role of KLRG1 in ageing is not known, and the mechanism of KLRG1-induced inhibition of NK cell function is not fully understood. We report that NK cells with high KLRG1 expression spontaneously activate the metabolic sensor AMP-activated protein kinase (AMPK) and that activation of AMPK negatively regulates NK cell function. Pre-existing AMPK activity is further amplified by ligation of KLRG1 in these cells, which leads to internalization of the receptor and allows interaction with AMPK. We show that KLRG1 activates AMPK by preventing its inhibitory dephosphorylation by protein phosphatase-2C rather than inducing de novo kinase activation. Finally, inhibition of KLRG1 or AMPK prevented KLRG1-induced activation of AMPK and reductions in NK cell cytotoxicity, cytokine secretion, proliferation, and telomerase expression. This novel signaling pathway links metabolic sensing, effector function, and cell differentiation with inhibitory receptor signaling that may be exploited to enhance NK cell activity during ageing.
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Affiliation(s)
| | - Alessio Lanna
- Division of Infection and Immunity, University College London, London, UK.,Nuffield Department of Medicine, University of Oxford, Oxford, UK
| | - Luciana Polaco Covre
- Division of Infection and Immunity, University College London, London, UK.,Núcleo de Doenças Infecciosas, Universidade Federal do Espírito Santo, Vitória, Brazil
| | - Rachel S Mills
- Division of Infection and Immunity, University College London, London, UK
| | - Sian M Henson
- William Harvey Research Institute, Barts & The London School of Medicine and Dentistry, Queen Mary University of London, London, UK
| | - Arne N Akbar
- Division of Infection and Immunity, University College London, London, UK
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17
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Claus M, Dychus N, Ebel M, Damaschke J, Maydych V, Wolf OT, Kleinsorge T, Watzl C. Measuring the immune system: a comprehensive approach for the analysis of immune functions in humans. Arch Toxicol 2016; 90:2481-95. [DOI: 10.1007/s00204-016-1809-5] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2016] [Accepted: 08/04/2016] [Indexed: 12/14/2022]
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