1
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Park HJ, Choi EA, Choi SM, Choi YK, Lee JI, Jung KC. IL-4/IL-4 Ab complex enhances the accumulation of both antigen-specific and bystander CD8 T cells in mouse lungs infected with influenza A virus. Lab Anim Res 2023; 39:32. [PMID: 38037190 PMCID: PMC10691054 DOI: 10.1186/s42826-023-00183-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Revised: 11/15/2023] [Accepted: 11/22/2023] [Indexed: 12/02/2023] Open
Abstract
BACKGROUND Unlike conventional T cells, innate and virtual-memory CD8 T cells in naïve mice acquire their memory phenotypes and functions in the absence of antigenic encounters in a cytokine-dependent manner. The relevant cytokines include interleukin-4 (IL-4), type I interferon, and interleukin-15 (IL-15). Moreover, exogenous IL-4 can also induce de novo generation and/or expansion of the virtual-memory CD8 T cell population. In this study, we investigated whether exogenous IL-4 could enhance the immune response to a viral infection. RESULTS In vivo administration of IL-4 and an anti-IL-4 antibody complex (IL-4C) increased CXCR3 expression in both memory and naïve phenotype CD8 T cells in the absence of antigenic stimulation, and protected mice from lethal influenza infection. Flow cytometric analysis of lung-infiltrating immune cells on day 5 after virus infection revealed higher numbers of antigen-specific and bystander CD8 T cells in IL-4C-treated mice than in control mice. In particular, the bystander CD8 T cells were a naïve or evident memory phenotypes. Crucially, an anti-CXCR3 blocking antibody abrogated this IL-4C effect, reflecting that the increased accumulation of CD8 T cells in the lungs after IL-4C treatment is dependent on CXCR3. CONCLUSIONS These data demonstrate that exogenous IL-4C plays a protective role by enhancing CXCR3-dependent migration of CD8 T cells into influenza-infected lungs.
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Affiliation(s)
- Hi Jung Park
- Graduate Course of Translational Medicine, Seoul National University College of Medicine, Seoul, 03080, Republic of Korea
| | - Eun Ah Choi
- Graduate Course of Translational Medicine, Seoul National University College of Medicine, Seoul, 03080, Republic of Korea
| | - Sung Min Choi
- Graduate Course of Translational Medicine, Seoul National University College of Medicine, Seoul, 03080, Republic of Korea
| | - Young-Ki Choi
- Department of Microbiology, College of Medicine and Medical Research Institute, Chungbuk National University, Cheongju, Chungcheongbuk-do, 28644, South Korea
| | - Jae Il Lee
- Graduate Course of Translational Medicine, Seoul National University College of Medicine, Seoul, 03080, Republic of Korea.
- Transplantation Research Institute, Seoul National University College of Medicine, Seoul, 03080, Republic of Korea.
- Department of Medicine, Seoul National University College of Medicine, Seoul, 03080, Republic of Korea.
| | - Kyeong Cheon Jung
- Graduate Course of Translational Medicine, Seoul National University College of Medicine, Seoul, 03080, Republic of Korea.
- Transplantation Research Institute, Seoul National University College of Medicine, Seoul, 03080, Republic of Korea.
- Department of Pathology, Seoul National University College of Medicine, Seoul, 03080, Republic of Korea.
- Integrated Major in Innovative Medical Science, Seoul National University Graduate School, Seoul, 03080, Republic of Korea.
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2
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Bystander activation in memory and antigen-inexperienced memory-like CD8 T cells. Curr Opin Immunol 2023; 82:102299. [PMID: 36913776 DOI: 10.1016/j.coi.2023.102299] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Revised: 02/09/2023] [Accepted: 02/13/2023] [Indexed: 03/13/2023]
Abstract
Antigen-induced memory T cells undergo counterintuitive activation in an antigen-independent manner, which is called bystander response. Although it is well documented that memory CD8+ T cells produce IFNγ and upregulate the cytotoxic program upon the stimulation with inflammatory cytokines, there is only rare evidence that this provides an actual protection against pathogens in immunocompetent individuals. One of the reasons might be numerous antigen-inexperienced memory-like T cells that are also capable of the bystander response. Little is known about the bystander protection of memory and memory-like T cells and their redundancies with innate-like lymphocytes in humans because of the interspecies differences and the lack of controlled experiments. However, it has been proposed that IL-15/NKG2D-driven bystander activation of memory T cells drives protection or immunopathology in particular human diseases.
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3
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Unique roles of co-receptor-bound LCK in helper and cytotoxic T cells. Nat Immunol 2023; 24:174-185. [PMID: 36564464 PMCID: PMC9810533 DOI: 10.1038/s41590-022-01366-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2021] [Accepted: 10/20/2022] [Indexed: 12/24/2022]
Abstract
The kinase LCK and CD4/CD8 co-receptors are crucial components of the T cell antigen receptor (TCR) signaling machinery, leading to key T cell fate decisions. Despite decades of research, the roles of CD4-LCK and CD8-LCK interactions in TCR triggering in vivo remain unknown. In this study, we created animal models expressing endogenous levels of modified LCK to resolve whether and how co-receptor-bound LCK drives TCR signaling. We demonstrated that the role of LCK depends on the co-receptor to which it is bound. The CD8-bound LCK is largely dispensable for antiviral and antitumor activity of cytotoxic T cells in mice; however, it facilitates CD8+ T cell responses to suboptimal antigens in a kinase-dependent manner. By contrast, the CD4-bound LCK is required for efficient development and function of helper T cells via a kinase-independent stabilization of surface CD4. Overall, our findings reveal the role of co-receptor-bound LCK in T cell biology, show that CD4- and CD8-bound LCK drive T cell development and effector immune responses using qualitatively different mechanisms and identify the co-receptor-LCK interactions as promising targets for immunomodulation.
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4
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Wang Y, Dong C, Han Y, Gu Z, Sun C. Immunosenescence, aging and successful aging. Front Immunol 2022; 13:942796. [PMID: 35983061 PMCID: PMC9379926 DOI: 10.3389/fimmu.2022.942796] [Citation(s) in RCA: 36] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Accepted: 07/08/2022] [Indexed: 12/24/2022] Open
Abstract
Aging induces a series of immune related changes, which is called immunosenescence, playing important roles in many age-related diseases, especially neurodegenerative diseases, tumors, cardiovascular diseases, autoimmune diseases and coronavirus disease 2019(COVID-19). However, the mechanism of immunosenescence, the association with aging and successful aging, and the effects on diseases are not revealed obviously. In order to provide theoretical basis for preventing or controlling diseases effectively and achieve successful aging, we conducted the review and found that changes of aging-related phenotypes, deterioration of immune organ function and alterations of immune cell subsets participated in the process of immunosenescence, which had great effects on the occurrence and development of age-related diseases.
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Affiliation(s)
- Yunan Wang
- Department of Rheumatology, Affiliated Hospital of Nantong University, Medical School of Nantong University, Nantong, China
| | - Chen Dong
- Department of Rheumatology, Affiliated Hospital of Nantong University, Nantong, China
| | - Yudian Han
- Information Center, The First People’s Hospital of Nantong City, Nantong, China
| | - Zhifeng Gu
- Department of Rheumatology, Affiliated Hospital of Nantong University, Nantong, China
- *Correspondence: Zhifeng Gu, ; Chi Sun,
| | - Chi Sun
- Department of Geriatrics, Affiliated Hospital of Nantong University, Nantong, China
- *Correspondence: Zhifeng Gu, ; Chi Sun,
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5
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Van Kaer L, Postoak JL, Song W, Wu L. Innate and Innate-like Effector Lymphocytes in Health and Disease. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2022; 209:199-207. [PMID: 35821102 PMCID: PMC9285656 DOI: 10.4049/jimmunol.2200074] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Accepted: 03/11/2022] [Indexed: 04/20/2023]
Abstract
Lymphocytes can be functionally partitioned into subsets belonging to the innate or adaptive arms of the immune system. Subsets of innate and innate-like lymphocytes may or may not express Ag-specific receptors of the adaptive immune system, yet they are poised to respond with innate-like speed to pathogenic insults but lack the capacity to develop classical immunological memory. These lymphocyte subsets display a number of common properties that permit them to integrate danger and stress signals dispatched by innate sensor cells to facilitate the generation of specialized effector immune responses tailored toward specific pathogens or other insults. In this review, we discuss the functions of distinct subsets of innate and innate-like lymphocytes. A better understanding of the mechanisms by which these cells are activated in different contexts, their interactions with other immune cells, and their role in health and disease may inform the development of new or improved immunotherapies.
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Affiliation(s)
- Luc Van Kaer
- Department of Pathology, Microbiology and Immunology, Vanderbilt University Medical Center, Nashville, TN
| | - J Luke Postoak
- Department of Pathology, Microbiology and Immunology, Vanderbilt University Medical Center, Nashville, TN
| | - Wenqiang Song
- Department of Pathology, Microbiology and Immunology, Vanderbilt University Medical Center, Nashville, TN
| | - Lan Wu
- Department of Pathology, Microbiology and Immunology, Vanderbilt University Medical Center, Nashville, TN
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6
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Jensen IJ, Li X, McGonagill PW, Shan Q, Fosdick MG, Tremblay MM, Houtman JCD, Xue HH, Griffith TS, Peng W, Badovinac VP. Sepsis leads to lasting changes in phenotype and function of memory CD8 T cells. eLife 2021; 10:e70989. [PMID: 34652273 PMCID: PMC8589447 DOI: 10.7554/elife.70989] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Accepted: 10/14/2021] [Indexed: 12/13/2022] Open
Abstract
The global health burden due to sepsis and the associated cytokine storm is substantial. While early intervention has improved survival during the cytokine storm, those that survive can enter a state of chronic immunoparalysis defined by transient lymphopenia and functional deficits of surviving cells. Memory CD8 T cells provide rapid cytolysis and cytokine production following re-encounter with their cognate antigen to promote long-term immunity, and CD8 T cell impairment due to sepsis can pre-dispose individuals to re-infection. While the acute influence of sepsis on memory CD8 T cells has been characterized, if and to what extent pre-existing memory CD8 T cells recover remains unknown. Here, we observed that central memory CD8 T cells (TCM) from septic patients proliferate more than those from healthy individuals. Utilizing LCMV immune mice and a CLP model to induce sepsis, we demonstrated that TCM proliferation is associated with numerical recovery of pathogen-specific memory CD8 T cells following sepsis-induced lymphopenia. This increased proliferation leads to changes in composition of memory CD8 T cell compartment and altered tissue localization. Further, memory CD8 T cells from sepsis survivors have an altered transcriptional profile and chromatin accessibility indicating long-lasting T cell intrinsic changes. The sepsis-induced changes in the composition of the memory CD8 T cell pool and transcriptional landscape culminated in altered T cell function and reduced capacity to control L. monocytogenes infection. Thus, sepsis leads to long-term alterations in memory CD8 T cell phenotype, protective function and localization potentially changing host capacity to respond to re-infection.
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Affiliation(s)
- Isaac J Jensen
- Department of Pathology, University of IowaIowa CityUnited States
| | - Xiang Li
- Department of Physics, The George Washington UniversityWashingtonUnited States
| | | | - Qiang Shan
- Center for Discovery and Innovation, Hackensack University Medical CenterNutleyUnited States
| | - Micaela G Fosdick
- Interdisciplinary Graduate Program in Molecular Medicine, University of IowaIowa CityUnited States
| | - Mikaela M Tremblay
- Interdisciplinary Graduate Program in Molecular Medicine, University of IowaIowa CityUnited States
| | - Jon CD Houtman
- Interdisciplinary Graduate Program in Molecular Medicine, University of IowaIowa CityUnited States
- Interdisciplinary Graduate Program in Molecular Medicine, University of IowaIowa CityUnited States
| | - Hai-Hui Xue
- Center for Discovery and Innovation, Hackensack University Medical CenterNutleyUnited States
| | - Thomas S Griffith
- Microbiology, Immunology, and Cancer Biology PhD Program, University of MinnesotaMinneapolisUnited States
- Department of Urology, University of MinnesotaMinneapolisUnited States
- Center for Immunology, University of MinnesotaMinneapolisUnited States
- Masonic Cancer Center, University of MinnesotaMinneapolisUnited States
- Minneapolis VA Health Care SystemMinneapolisUnited States
| | - Weiqun Peng
- Department of Physics, The George Washington UniversityWashingtonUnited States
| | - Vladimir P Badovinac
- Department of Pathology, University of IowaIowa CityUnited States
- Interdisciplinary Graduate Program in Molecular Medicine, University of IowaIowa CityUnited States
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7
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Kwesi-Maliepaard EM, Jacobs H, van Leeuwen F. Signals for antigen-independent differentiation of memory CD8 + T cells. Cell Mol Life Sci 2021; 78:6395-6408. [PMID: 34398252 PMCID: PMC8558200 DOI: 10.1007/s00018-021-03912-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Revised: 07/23/2021] [Accepted: 08/03/2021] [Indexed: 12/18/2022]
Abstract
Conventional CD8+ memory T cells develop upon stimulation with foreign antigen and provide increased protection upon re-challenge. Over the past two decades, new subsets of CD8+ T cells have been identified that acquire memory features independently of antigen exposure. These antigen-inexperienced memory T cells (TAIM) are described under several names including innate memory, virtual memory, and memory phenotype. TAIM cells exhibit characteristics of conventional or true memory cells, including antigen-specific responses. In addition, they show responsiveness to innate stimuli and have been suggested to provide additional levels of protection toward infections and cancer. Here, we discuss the current understanding of TAIM cells, focusing on extrinsic and intrinsic molecular conditions that favor their development, their molecular definitions and immunological properties, as well as their transcriptional and epigenetic regulation.
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Affiliation(s)
| | - Heinz Jacobs
- Division of Tumor Biology and Immunology, Netherlands Cancer Institute, 1066CX, Amsterdam, The Netherlands
| | - Fred van Leeuwen
- Division of Gene Regulation, Netherlands Cancer Institute, 1066CX, Amsterdam, The Netherlands.
- Department of Medical Biology, Amsterdam UMC, University of Amsterdam, 1105AZ, Amsterdam, The Netherlands.
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8
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Moudra A, Niederlova V, Novotny J, Schmiedova L, Kubovciak J, Matejkova T, Drobek A, Pribikova M, Stopkova R, Cizkova D, Neuwirth A, Michalik J, Krizova K, Hudcovic T, Kolar M, Kozakova H, Kreisinger J, Stopka P, Stepanek O. Phenotypic and Clonal Stability of Antigen-Inexperienced Memory-like T Cells across the Genetic Background, Hygienic Status, and Aging. THE JOURNAL OF IMMUNOLOGY 2021; 206:2109-2121. [PMID: 33858960 DOI: 10.4049/jimmunol.2001028] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Accepted: 03/01/2021] [Indexed: 12/17/2022]
Abstract
Ag-inexperienced memory-like T (AIMT) cells are functionally unique T cells, representing one of the two largest subsets of murine CD8+ T cells. However, differences between laboratory inbred strains, insufficient data from germ-free mice, a complete lack of data from feral mice, and an unclear relationship between AIMT cells formation during aging represent major barriers for better understanding of their biology. We performed a thorough characterization of AIMT cells from mice of different genetic background, age, and hygienic status by flow cytometry and multiomics approaches, including analyses of gene expression, TCR repertoire, and microbial colonization. Our data showed that AIMT cells are steadily present in mice, independent of their genetic background and hygienic status. Despite differences in their gene expression profiles, young and aged AIMT cells originate from identical clones. We identified that CD122 discriminates two major subsets of AIMT cells in a strain-independent manner. Whereas thymic CD122LOW AIMT cells (innate memory) prevail only in young animals with high thymic IL-4 production, peripheral CD122HIGH AIMT cells (virtual memory) dominate in aged mice. Cohousing with feral mice changed the bacterial colonization of laboratory strains but had only minimal effects on the CD8+ T cell compartment, including AIMT cells.
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Affiliation(s)
- Alena Moudra
- Laboratory of Adaptive Immunity, Institute of Molecular Genetics of the Czech Academy of Sciences, Prague, Czech Republic
| | - Veronika Niederlova
- Laboratory of Adaptive Immunity, Institute of Molecular Genetics of the Czech Academy of Sciences, Prague, Czech Republic
| | - Jiri Novotny
- Laboratory of Genomics and Bioinformatics, Institute of Molecular Genetics of the Czech Academy of Sciences, Prague, Czech Republic.,Department of Informatics and Chemistry, Faculty of Chemical Technology, University of Chemistry and Technology, Prague, Czech Republic
| | - Lucie Schmiedova
- Department of Zoology, Faculty of Science, Charles University, Prague, Czech Republic
| | - Jan Kubovciak
- Laboratory of Genomics and Bioinformatics, Institute of Molecular Genetics of the Czech Academy of Sciences, Prague, Czech Republic.,Department of Zoology, Faculty of Science, Charles University, Prague, Czech Republic
| | - Tereza Matejkova
- Department of Zoology, Faculty of Science, BIOCEV, Charles University, Vestec, Czech Republic
| | - Ales Drobek
- Laboratory of Adaptive Immunity, Institute of Molecular Genetics of the Czech Academy of Sciences, Prague, Czech Republic
| | - Michaela Pribikova
- Laboratory of Adaptive Immunity, Institute of Molecular Genetics of the Czech Academy of Sciences, Prague, Czech Republic.,Laboratory of Immunity & Cell Communication, First Faculty of Medicine, BIOCEV, Charles University, Vestec, Czech Republic
| | - Romana Stopkova
- Department of Zoology, Faculty of Science, BIOCEV, Charles University, Vestec, Czech Republic
| | - Dagmar Cizkova
- Research Facility Studenec, Institute of Vertebrate Biology, Czech Academy of Sciences, Brno, Czech Republic
| | - Ales Neuwirth
- Laboratory of Adaptive Immunity, Institute of Molecular Genetics of the Czech Academy of Sciences, Prague, Czech Republic
| | - Juraj Michalik
- Laboratory of Adaptive Immunity, Institute of Molecular Genetics of the Czech Academy of Sciences, Prague, Czech Republic
| | - Katerina Krizova
- Laboratory of Adaptive Immunity, Institute of Molecular Genetics of the Czech Academy of Sciences, Prague, Czech Republic
| | - Tomas Hudcovic
- Laboratory of Gnotobiology, Institute of Microbiology of the Czech Academy of Sciences, Novy Hradek, Czech Republic; and
| | - Michal Kolar
- Laboratory of Genomics and Bioinformatics, Institute of Molecular Genetics of the Czech Academy of Sciences, Prague, Czech Republic.,Department of Informatics and Chemistry, Faculty of Chemical Technology, University of Chemistry and Technology, Prague, Czech Republic
| | - Hana Kozakova
- Laboratory of Gnotobiology, Institute of Microbiology of the Czech Academy of Sciences, Novy Hradek, Czech Republic; and
| | - Jakub Kreisinger
- Department of Zoology, Faculty of Science, Charles University, Prague, Czech Republic
| | - Pavel Stopka
- Department of Zoology, Faculty of Science, BIOCEV, Charles University, Vestec, Czech Republic
| | - Ondrej Stepanek
- Laboratory of Adaptive Immunity, Institute of Molecular Genetics of the Czech Academy of Sciences, Prague, Czech Republic; .,Department of Biomedicine, University Hospital and University of Basel, Basel, Switzerland
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9
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Niederlova V, Tsyklauri O, Chadimova T, Stepanek O. CD8 + Tregs revisited: A heterogeneous population with different phenotypes and properties. Eur J Immunol 2021; 51:512-530. [PMID: 33501647 DOI: 10.1002/eji.202048614] [Citation(s) in RCA: 38] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Revised: 10/31/2020] [Accepted: 01/21/2021] [Indexed: 12/20/2022]
Abstract
Regulatory T cells (Tregs) play a key role in the peripheral self-tolerance and preventing autoimmunity. While classical CD4+ Foxp3+ Tregs are well established, their CD8+ counterparts are still controversial in many aspects including their phenotypic identity and their mechanisms of suppression. Because of these controversies and because of only a limited number of studies documenting the immunoregulatory function of CD8+ Tregs in vivo, the concept of CD8+ Tregs is still not unanimously accepted. We propose that any T-cell subset considered as true regulatory must be distinguishable from other cell types and must suppress in vivo immune responses via a known mechanism. In this article, we revisit the concept of CD8+ Tregs by focusing on the characterization of individual CD8+ T-cell subsets with proposed regulatory capacity separately. Therefore, we review the phenotype and function of CD8+ FOXP3+ T cells, CD8+ CD122+ T cells, CD8+ CD28low/- T cells, CD8+ CD45RClow T cells, T cells expressing CD8αα homodimer and Qa-1-restricted CD8+ T cells to show whether there is sufficient evidence to establish these subsets as bona fide Tregs. Based on the intrinsic ability of CD8+ Treg subsets to promote immune tolerance in animal models, we elaborate on their potential use in clinics.
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Affiliation(s)
- Veronika Niederlova
- Laboratory of Adaptive Immunity, Institute of Molecular Genetics of the Czech Academy of Sciences, Prague, Czech Republic
| | - Oksana Tsyklauri
- Laboratory of Adaptive Immunity, Institute of Molecular Genetics of the Czech Academy of Sciences, Prague, Czech Republic.,Faculty of Science, Charles University, Prague, Czech Republic
| | - Tereza Chadimova
- Laboratory of Adaptive Immunity, Institute of Molecular Genetics of the Czech Academy of Sciences, Prague, Czech Republic.,Institute of Experimental Neuroimmunology, Technical University of Munich, Munich, Germany
| | - Ondrej Stepanek
- Laboratory of Adaptive Immunity, Institute of Molecular Genetics of the Czech Academy of Sciences, Prague, Czech Republic
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10
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Gustafson CE, Jadhav R, Cao W, Qi Q, Pegram M, Tian L, Weyand CM, Goronzy JJ. Immune cell repertoires in breast cancer patients after adjuvant chemotherapy. JCI Insight 2020; 5:134569. [PMID: 32102986 PMCID: PMC7101137 DOI: 10.1172/jci.insight.134569] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Accepted: 01/29/2020] [Indexed: 12/24/2022] Open
Abstract
Adjuvant chemotherapy in breast cancer patients causes immune cell depletion at an age when the regenerative capacity is compromised. Successful regeneration requires the recovery of both quantity and quality of immune cell subsets. Although immune cell numbers rebound within a year after treatment, it is unclear whether overall compositional diversity is recovered. We investigated the regeneration of immune cell complexity by comparing peripheral blood mononuclear cells from breast cancer patients ranging from 1-5 years after chemotherapy with those of age-matched healthy controls using mass cytometry and T cell receptor sequencing. These data reveal universal changes in patients' CD4+ T cells that persisted for years and consisted of expansion of Th17-like CD4 memory populations with incomplete recovery of CD4+ naive T cells. Conversely, CD8+ T cells fully recovered within a year. Mechanisms of T cell regeneration, however, were unbiased, as CD4+ and CD8+ T cell receptor diversity remained high. Likewise, terminal differentiated effector memory cells were not expanded, indicating that regeneration was not driven by recognition of latent viruses. These data suggest that, while CD8+ T cell immunity is successfully regenerated, the CD4 compartment may be irreversibly affected. Moreover, the bias of CD4 memory toward inflammatory effector cells may impact responses to vaccination and infection.
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Affiliation(s)
- Claire E Gustafson
- Division of Immunology and Rheumatology, Department of Medicine, Stanford University School of Medicine, Stanford, California, USA.,Department of Medicine, Veterans Administration Healthcare System, Palo Alto, California, USA
| | - Rohit Jadhav
- Division of Immunology and Rheumatology, Department of Medicine, Stanford University School of Medicine, Stanford, California, USA.,Department of Medicine, Veterans Administration Healthcare System, Palo Alto, California, USA
| | - Wenqiang Cao
- Division of Immunology and Rheumatology, Department of Medicine, Stanford University School of Medicine, Stanford, California, USA.,Department of Medicine, Veterans Administration Healthcare System, Palo Alto, California, USA
| | - Qian Qi
- Division of Immunology and Rheumatology, Department of Medicine, Stanford University School of Medicine, Stanford, California, USA.,Department of Medicine, Veterans Administration Healthcare System, Palo Alto, California, USA
| | | | - Lu Tian
- Department of Biomedical Data Science, Stanford University School of Medicine, Stanford, California, USA
| | - Cornelia M Weyand
- Division of Immunology and Rheumatology, Department of Medicine, Stanford University School of Medicine, Stanford, California, USA.,Department of Medicine, Veterans Administration Healthcare System, Palo Alto, California, USA
| | - Jorg J Goronzy
- Division of Immunology and Rheumatology, Department of Medicine, Stanford University School of Medicine, Stanford, California, USA.,Department of Medicine, Veterans Administration Healthcare System, Palo Alto, California, USA
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11
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Hussain T, Quinn KM. Similar but different: virtual memory CD8 T cells as a memory-like cell population. Immunol Cell Biol 2019; 97:675-684. [PMID: 31140625 DOI: 10.1111/imcb.12277] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2019] [Revised: 03/26/2019] [Accepted: 05/26/2019] [Indexed: 01/02/2023]
Abstract
Immunological memory is a phenomenon where the immune system can respond more rapidly to pathogens and immunological challenges that it has previously encountered. It is defined by several key hallmarks. After an initial encounter, immune cells (1) expand and (2) differentiate to form memory cell populations. Memory cells are (3) long-lived and (4) facilitate more rapid immune responses to subsequent infection because of (i) an increase in cell number, (ii) a decrease in the signaling threshold required for entry into cell cycle or effector function and (iii) localization of cells to tissue sites for surveillance. Classically, immunological memory has been antigen specific but it is becoming apparent that mechanisms of immunological memory can be co-opted by innate or antigen-inexperienced immune cells to generate heterogeneity in immune responses. One such cell is the virtual memory CD8 T (TVM ) cell, which is a semi-differentiated but antigen-naïve CD8 T-cell population. This review will summarize current knowledge of how TVM cells are generated, their memory-like hallmarks, how they are maintained during steady state, infection and aging, and propose a model to integrate key signaling pathways during their generation.
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Affiliation(s)
- Tabinda Hussain
- Monash University Biomedicine Discovery Institute, Clayton, VIC, Australia.,Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC, Australia
| | - Kylie M Quinn
- Monash University Biomedicine Discovery Institute, Clayton, VIC, Australia.,Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC, Australia.,RMIT University School of Biomedical and Health Sciences, Bundoora, VIC, Australia
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