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Arellano G, Acuña E, Loda E, Moore L, Tichauer JE, Castillo C, Vergara F, Burgos PI, Penaloza-MacMaster P, Miller SD, Naves R. Therapeutic role of interferon-γ in experimental autoimmune encephalomyelitis is mediated through a tolerogenic subset of splenic CD11b + myeloid cells. J Neuroinflammation 2024; 21:144. [PMID: 38822334 PMCID: PMC11143617 DOI: 10.1186/s12974-024-03126-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2024] [Accepted: 05/05/2024] [Indexed: 06/02/2024] Open
Abstract
Cumulative evidence has established that Interferon (IFN)-γ has both pathogenic and protective roles in Multiple Sclerosis and the animal model, Experimental Autoimmune Encephalomyelitis (EAE). However, the underlying mechanisms to the beneficial effects of IFN-γ are not well understood. In this study, we found that IFN-γ exerts therapeutic effects on chronic, relapsing-remitting, and chronic progressive EAE models. The frequency of regulatory T (Treg) cells in spinal cords from chronic EAE mice treated with IFN-γ was significantly increased with no effect on Th1 and Th17 cells. Consistently, depletion of FOXP3-expressing cells blocked the protective effects of IFN-γ, indicating that the therapeutic effect of IFN-γ depends on the presence of Treg cells. However, IFN-γ did not trigger direct in vitro differentiation of Treg cells. In vivo administration of blocking antibodies against either interleukin (IL)-10, transforming growth factor (TGF)-β or program death (PD)-1, revealed that the protective effects of IFN-γ in EAE were also dependent on TGF-β and PD-1, but not on IL-10, suggesting that IFN-γ might have an indirect role on Treg cells acting through antigen-presenting cells. Indeed, IFN-γ treatment increased the frequency of a subset of splenic CD11b+ myeloid cells expressing TGF-β-Latency Associated Peptide (LAP) and program death ligand 1 (PD-L1) in a signal transducer and activator of transcription (STAT)-1-dependent manner. Furthermore, splenic CD11b+ cells from EAE mice preconditioned in vitro with IFN-γ and myelin oligodendrocyte glycoprotein (MOG) peptide exhibited a tolerogenic phenotype with the capability to induce conversion of naïve CD4+ T cells mediated by secretion of TGF-β. Remarkably, adoptive transfer of splenic CD11b+ cells from IFN-γ-treated EAE mice into untreated recipient mice ameliorated clinical symptoms of EAE and limited central nervous system infiltration of mononuclear cells and effector helper T cells. These results reveal a novel cellular and molecular mechanism whereby IFN-γ promotes beneficial effects in EAE by endowing splenic CD11b+ myeloid cells with tolerogenic and therapeutic activities.
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MESH Headings
- Animals
- Encephalomyelitis, Autoimmune, Experimental/immunology
- Encephalomyelitis, Autoimmune, Experimental/drug therapy
- Encephalomyelitis, Autoimmune, Experimental/metabolism
- Encephalomyelitis, Autoimmune, Experimental/pathology
- Mice
- Interferon-gamma/metabolism
- Myeloid Cells/drug effects
- Myeloid Cells/immunology
- Myeloid Cells/metabolism
- Spleen/immunology
- Mice, Inbred C57BL
- CD11b Antigen/metabolism
- Female
- Myelin-Oligodendrocyte Glycoprotein/toxicity
- Myelin-Oligodendrocyte Glycoprotein/immunology
- T-Lymphocytes, Regulatory/immunology
- T-Lymphocytes, Regulatory/drug effects
- Peptide Fragments/toxicity
- Peptide Fragments/pharmacology
- Transforming Growth Factor beta/metabolism
- Programmed Cell Death 1 Receptor/metabolism
- Programmed Cell Death 1 Receptor/immunology
- Forkhead Transcription Factors/metabolism
- Disease Models, Animal
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Affiliation(s)
- Gabriel Arellano
- Program of Immunology, Institute of Biomedical Sciences, Faculty of Medicine, Universidad de Chile, Santiago, Chile
- Department of Microbiology-Immunology, Feinberg School of Medicine, Northwestern University, Chicago, IL, US
- Center for Human Immunology, Feinberg School of Medicine, Northwestern University, Chicago, IL, US
| | - Eric Acuña
- Program of Immunology, Institute of Biomedical Sciences, Faculty of Medicine, Universidad de Chile, Santiago, Chile
| | - Eileah Loda
- Department of Microbiology-Immunology, Feinberg School of Medicine, Northwestern University, Chicago, IL, US
| | - Lindsay Moore
- Department of Microbiology-Immunology, Feinberg School of Medicine, Northwestern University, Chicago, IL, US
| | - Juan E Tichauer
- Program of Immunology, Institute of Biomedical Sciences, Faculty of Medicine, Universidad de Chile, Santiago, Chile
| | - Cristian Castillo
- Program of Immunology, Institute of Biomedical Sciences, Faculty of Medicine, Universidad de Chile, Santiago, Chile
| | - Fabian Vergara
- Program of Immunology, Institute of Biomedical Sciences, Faculty of Medicine, Universidad de Chile, Santiago, Chile
| | - Paula I Burgos
- Department of Clinical Immunology and Rheumatology, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Pablo Penaloza-MacMaster
- Department of Microbiology-Immunology, Feinberg School of Medicine, Northwestern University, Chicago, IL, US
- Center for Human Immunology, Feinberg School of Medicine, Northwestern University, Chicago, IL, US
| | - Stephen D Miller
- Department of Microbiology-Immunology, Feinberg School of Medicine, Northwestern University, Chicago, IL, US.
- Center for Human Immunology, Feinberg School of Medicine, Northwestern University, Chicago, IL, US.
| | - Rodrigo Naves
- Program of Immunology, Institute of Biomedical Sciences, Faculty of Medicine, Universidad de Chile, Santiago, Chile.
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Yasuda M, Uzawa A, Ozawa Y, Kojima Y, Onishi Y, Akamine H, Kuwabara S. Serum cytokine profiles in myasthenia gravis with anti-muscle-specific kinase antibodies. J Neuroimmunol 2023; 384:578205. [PMID: 37774555 DOI: 10.1016/j.jneuroim.2023.578205] [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: 01/24/2023] [Revised: 08/24/2023] [Accepted: 09/19/2023] [Indexed: 10/01/2023]
Abstract
This study measured the serum levels of of 15 cytokines in 15 patients with anti-muscle-specific kinase antibody-positive MG (MuSK-MG) using a multiplex suspension array system. Fifteen patients with non-inflammatory neurological diseases served as controls. Compared with controls, patients with MuSK-MG showed higher levels of Th1- (IFN-γ), Th2- (IL-25, IL-31, and IL-33), Th17- (IL-22), Treg-related cytokines (IL-10), and soluble CD40 ligand (sCD40L). Higher serum Th2-related cytokines (IL-25 and IL-31) levels were correlated with less MG Foundation of America (MGFA) class. These suggest that Th2-related cytokines have protective effects, whereas sCD40L and others may facilitate the disease.
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Affiliation(s)
- Manato Yasuda
- Department of Neurology, Graduate School of Medicine, Chiba University, Japan
| | - Akiyuki Uzawa
- Department of Neurology, Graduate School of Medicine, Chiba University, Japan.
| | - Yukiko Ozawa
- Department of Neurology, Graduate School of Medicine, Chiba University, Japan; Department of Neurology, Japanese Red Cross Narita Hospital, Japan
| | - Yuta Kojima
- Department of Neurology, Graduate School of Medicine, Chiba University, Japan; Department of Neurology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Yosuke Onishi
- Department of Neurology, Graduate School of Medicine, Chiba University, Japan
| | - Hiroyuki Akamine
- Department of Neurology, Graduate School of Medicine, Chiba University, Japan
| | - Satoshi Kuwabara
- Department of Neurology, Graduate School of Medicine, Chiba University, Japan
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Zhang XY, Qin XY, Shen HH, Liu KT, Wang CJ, Peng T, Wu JN, Zhao SM, Li MQ. IL-27 deficiency inhibits proliferation and invasion of trophoblasts via the SFRP2/Wnt/β-catenin pathway in fetal growth restriction. Int J Med Sci 2023; 20:392-405. [PMID: 36860682 PMCID: PMC9969501 DOI: 10.7150/ijms.80684] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Accepted: 01/19/2023] [Indexed: 02/15/2023] Open
Abstract
Background: Fetal growth restriction (FGR) is characterized by restricted fetal growth and dysregulated placental development. The etiology and pathogenesis still remain elusive. IL-27 shows multiple roles in regulating various biological processes, however, how IL-27 involves in placentation in FGR pregnancy hasn't been demonstrated. Methods: The levels of IL-27 and IL-27RA in FGR and normal placentae were determined by immunohistochemistry, western blot and RT-PCR. HTR-8/SVneo cells and Il27ra-/- murine models have been adopted to evaluate the effects of IL-27 on the bio-functions of trophoblast cells. GO enrichment and GSEA analysis were performed to explore the underlying mechanism. Findings: IL-27 and IL-27RA was lowly expressed in FGR placentae and administration of IL-27 on HTR-8/SVneo could promote its proliferation, migration and invasion. Comparing with wildtypes, Il27ra-/- embryos were smaller and lighter, and the placentae from which were poorly developed. In mechanism, the molecules of canonical Wnt/β-catenin pathway (CCND1, CMYC, SOX9) were downregulated in Il27ra-/- placentae. In contrast, the expression of SFRP2 (negative regulator of Wnt) was increased. Overexpression of SFRP2 in vitro could impair trophoblast migration and invasion capacity. Interpretation: IL-27/IL-27RA negatively regulates SFRP2 to activate Wnt/β-catenin, and thus promotes migration and invasion of trophoblasts during pregnancy. However, IL-27 deficiency may contribute to the development of FGR by restricting the Wnt activity.
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Affiliation(s)
- Xin-Yan Zhang
- Laboratory for Reproductive Immunology, Hospital of Obstetrics and Gynecology, Fudan University, Shanghai 200080, People's Republic of China.,NHC Key Lab of Reproduction Regulation, Shanghai Institute for Biomedical and Pharmaceutical Technologies, Fudan University, Shanghai 201203, People's Republic of China
| | - Xue-Yun Qin
- Laboratory for Reproductive Immunology, Hospital of Obstetrics and Gynecology, Fudan University, Shanghai 200080, People's Republic of China
| | - Hui-Hui Shen
- Laboratory for Reproductive Immunology, Hospital of Obstetrics and Gynecology, Fudan University, Shanghai 200080, People's Republic of China
| | - Ke-Tong Liu
- Department of Obstetrics, Hospital of Obstetrics and Gynecology, Shanghai Medical School, Fudan University, Shanghai 200011, People's Republic of China
| | - Cheng-Jie Wang
- Department of Obstetrics, Hospital of Obstetrics and Gynecology, Shanghai Medical School, Fudan University, Shanghai 200011, People's Republic of China
| | - Ting Peng
- Department of Obstetrics, Hospital of Obstetrics and Gynecology, Shanghai Medical School, Fudan University, Shanghai 200011, People's Republic of China
| | - Jiang-Nan Wu
- Clinical Epidemiology, Hospital of Obstetrics and Gynecology, Shanghai Medical School, Fudan University, Shanghai 200011, People's Republic of China
| | - Shi-Min Zhao
- Laboratory for Reproductive Immunology, Hospital of Obstetrics and Gynecology, Fudan University, Shanghai 200080, People's Republic of China.,State Key Laboratory of Genetic Engineering, Collaborative Innovation Center for Genetics and Development, School of Life Sciences, Fudan University, Shanghai 200433, People's Republic of China.,Shanghai Key Laboratory of Female Reproductive Endocrine Related Diseases, Hospital of Obstetrics and Gynecology, Fudan University, Shanghai 200080, People's Republic of China
| | - Ming-Qing Li
- Laboratory for Reproductive Immunology, Hospital of Obstetrics and Gynecology, Fudan University, Shanghai 200080, People's Republic of China.,NHC Key Lab of Reproduction Regulation, Shanghai Institute for Biomedical and Pharmaceutical Technologies, Fudan University, Shanghai 201203, People's Republic of China.,Shanghai Key Laboratory of Female Reproductive Endocrine Related Diseases, Hospital of Obstetrics and Gynecology, Fudan University, Shanghai 200080, People's Republic of China
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Nortey AN, Garces KN, Hackam AS. Exploring the role of interleukin-27 as a regulator of neuronal survival in central nervous system diseases. Neural Regen Res 2022; 17:2149-2152. [PMID: 35259821 PMCID: PMC9083161 DOI: 10.4103/1673-5374.336134] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Revised: 10/12/2021] [Accepted: 11/16/2021] [Indexed: 12/13/2022] Open
Abstract
Interleukin-27 is a pleiotropic cytokine that is involved in tissue responses to infection, cell stress, neuronal disease, and tumors. Recent studies in various tissues indicate that interleukin-27 has complex activating and inhibitory properties in innate and acquired immunity. The availability of recombinant interleukin-27 protein and mice with genetic deletions of interleukin-27, its receptors and signaling mediators have helped define the role of interleukin-27 in neurodegenerative diseases. Interleukin-27 has been well-characterized as an important regulator of T cell activation and differentiation that enhances or suppresses T cell responses in autoimmune conditions in the central nervous system. Evidence is also accumulating that interleukin-27 has neuroprotective activities in the retina and brain. Interleukin-27 is secreted from and binds to infiltrating microglia, macrophage, astrocytes, and even neurons and it promotes neuronal survival by regulating pro- and anti-inflammatory cytokines, neuroinflammatory pathways, oxidative stress, apoptosis, autophagy, and epigenetic modifications. However, interleukin-27 can have the opposite effect and induce inflammation and cell death in certain situations. In this review, we describe the current understanding of regulatory activities of interleukin-27 on cell survival and inflammation and discuss its mechanisms of action in the brain, spinal cord, and retina. We also review evidence for and against the therapeutic potential of interleukin-27 for dampening harmful neuroinflammatory responses in central nervous system diseases.
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Affiliation(s)
- Andrea N. Nortey
- Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, FL, USA
| | - Kimberly N. Garces
- Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, FL, USA
| | - Abigail S. Hackam
- Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, FL, USA
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Li R, Li H, Yang X, Hu H, Liu P, Liu H. Crosstalk between dendritic cells and regulatory T cells: Protective effect and therapeutic potential in multiple sclerosis. Front Immunol 2022; 13:970508. [PMID: 36177043 PMCID: PMC9513370 DOI: 10.3389/fimmu.2022.970508] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Accepted: 08/01/2022] [Indexed: 11/13/2022] Open
Abstract
Multiple sclerosis (MS) is a chronic inflammatory disease of the central nervous system related to autoimmunity and is characterized by demyelination, neuroinflammation, and neurodegeneration. Cell therapies mediated by dendritic cells (DCs) and regulatory T cells (Tregs) have gradually become accumulating focusing in MS, and the protective crosstalk mechanisms between DCs and Tregs provide the basis for the efficacy of treatment regimens. In MS and its animal model experimental autoimmune encephalomyelitis, DCs communicate with Tregs to form immune synapses and complete a variety of complex interactions to counteract the unbalanced immune tolerance. Through different co-stimulatory/inhibitory molecules, cytokines, and metabolic enzymes, DCs regulate the proliferation, differentiation and function of Tregs. On the other hand, Tregs inhibit the mature state and antigen presentation ability of DCs, ultimately improving immune tolerance. In this review, we summarized the pivotal immune targets in the interaction between DCs and Tregs, and elucidated the protective mechanisms of DC-Treg cell crosstalk in MS, finally interpreted the complex cell interplay in the manner of inhibitory feedback loops to explore novel therapeutic directions for MS.
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Affiliation(s)
- Ruoyu Li
- Department of Neurology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Hui Li
- Department of Neurology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Xiaoyan Yang
- Department of Neurology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Huiru Hu
- Department of Neurology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Peidong Liu
- Department of Neurosurgery, First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
- Translational Medicine Center, First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Hongbo Liu
- Department of Neurology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
- Translational Medicine Center, First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
- *Correspondence: Hongbo Liu,
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Dagkonaki A, Papalambrou A, Avloniti M, Gkika A, Evangelidou M, Androutsou ME, Tselios T, Probert L. Maturation of circulating Ly6ChiCCR2+ monocytes by mannan-MOG induces antigen-specific tolerance and reverses autoimmune encephalomyelitis. Front Immunol 2022; 13:972003. [PMID: 36159850 PMCID: PMC9501702 DOI: 10.3389/fimmu.2022.972003] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2022] [Accepted: 08/03/2022] [Indexed: 11/30/2022] Open
Abstract
Autoimmune diseases affecting the CNS not only overcome immune privilege mechanisms that protect neural tissues but also peripheral immune tolerance mechanisms towards self. Together with antigen-specific T cells, myeloid cells are main effector cells in CNS autoimmune diseases such as multiple sclerosis, but the relative contributions of blood-derived monocytes and the tissue resident macrophages to pathology and repair is incompletely understood. Through the study of oxidized mannan-conjugated myelin oligodendrocyte glycoprotein 35-55 (OM-MOG), we show that peripheral maturation of Ly6ChiCCR2+ monocytes to Ly6ChiMHCII+PD-L1+ cells is sufficient to reverse spinal cord inflammation and demyelination in MOG-induced autoimmune encephalomyelitis. Soluble intradermal OM-MOG drains directly to the skin draining lymph node to be sequestered by subcapsular sinus macrophages, activates Ly6ChiCCR2+ monocytes to produce MHC class II and PD-L1, prevents immune cell trafficking to spinal cord, and reverses established lesions. We previously showed that protection by OM-peptides is antigen specific. Here, using a neutralizing anti-PD-L1 antibody in vivo and dendritic cell-specific Pdl1 knockout mice, we further demonstrate that PD-L1 in non-dendritic cells is essential for the therapeutic effects of OM-MOG. These results show that maturation of circulating Ly6ChiCCR2+ monocytes by OM-myelin peptides represents a novel mechanism of immune tolerance that reverses autoimmune encephalomyelitis.
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Affiliation(s)
- Anastasia Dagkonaki
- Laboratory of Molecular Genetics, Department of Immunology, Hellenic Pasteur Institute, Athens, Greece
| | - Athina Papalambrou
- Laboratory of Molecular Genetics, Department of Immunology, Hellenic Pasteur Institute, Athens, Greece
| | - Maria Avloniti
- Laboratory of Molecular Genetics, Department of Immunology, Hellenic Pasteur Institute, Athens, Greece
| | - Areti Gkika
- Department of Chemistry, University of Patras, Patras, Greece
| | - Maria Evangelidou
- Laboratory of Molecular Genetics, Department of Immunology, Hellenic Pasteur Institute, Athens, Greece
| | | | | | - Lesley Probert
- Laboratory of Molecular Genetics, Department of Immunology, Hellenic Pasteur Institute, Athens, Greece
- *Correspondence: Lesley Probert,
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Depleting Tumor Cells Expressing Immune Checkpoint Ligands-A New Approach to Combat Cancer. Cells 2021; 10:cells10040872. [PMID: 33921301 PMCID: PMC8069236 DOI: 10.3390/cells10040872] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2021] [Revised: 04/02/2021] [Accepted: 04/08/2021] [Indexed: 12/12/2022] Open
Abstract
Antibodies against inhibitory immune checkpoint molecules (ICPMs), referred to as immune checkpoint inhibitors (ICIs), have gained a prominent place in cancer therapy. Several ICIs in clinical use have been engineered to be devoid of effector functions because of the fear that ICIs with preserved effector functions could deplete immune cells, thereby curtailing antitumor immune responses. ICPM ligands (ICPMLs), however, are often overexpressed on a sizeable fraction of tumor cells of many tumor types and these tumor cells display an aggressive phenotype with changes typical of tumor cells undergoing an epithelial-mesenchymal transition. Moreover, immune cells expressing ICPMLs are often endowed with immunosuppressive or immune-deviated functionalities. Taken together, these observations suggest that compounds with the potential of depleting cells expressing ICPMLs may become useful tools for tumor therapy. In this article, we summarize the current state of the art of these compounds, including avelumab, which is the only ICI targeting an ICPML with preserved effector functions that has gained approval so far. We also discuss approaches allowing to obtain compounds with enhanced tumor cell-depleting potential compared to native antibodies. Eventually, we propose treatment protocols that may be applied in order to optimize the therapeutic efficacy of compounds that deplete cells expressing ICPMLs.
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Wang M, Yin S, Qin Q, Peng Y, Hu Z, Zhu X, Liu L, Li X. Stenotrophomonas-maltophilia inhibits host cellular immunity by activating PD-1/PD-L1 signaling pathway to induce T-cell exhaustion. Mol Immunol 2020; 130:37-48. [PMID: 33360150 DOI: 10.1016/j.molimm.2020.12.019] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Revised: 11/25/2020] [Accepted: 12/11/2020] [Indexed: 11/16/2022]
Abstract
BACKGROUND Smalotrophomonas maltophilia(S. maltophilia) is common in nosocomial infections. However, few studies have revealed the effect of S. maltophilia on cellular immunity in the host's immune system up to now. In clinical work, we accidentally discovered that S. maltophilia directly stimulated T cells to secrete IFN-γ. MATERIALS AND METHODS S. maltophilia was co-cultured with PBMCs to detect secretion of cytokines (IFN-γ, TNF-α and IL-2) and expression of cell surface molecules (CD3, CD4, CD8, CD69, CD147 and CD152) of T cells. We used light microscopy and electron microscopy to observe the cell morphology and subcellular structure of S. maltophilia co-cultured with lymphocytes. Flow cytometry and Western Blot were used to detect the expression of PD-1/PD-L1 and annexin V in cells. RESULTS T cells stimulated by S. maltophilia secreted a large amount of IL-2, IFN-γ, and TNF-α. The expression of CD4 and CD8 on the cell surface were declined, accompanied by the activation of the PD-1/PD-L1 pathway, which eventually led to the massive apoptosis of T cells. Electron microscopy showed that cells showed significant apoptotic morphology. Blocking the PD-1/PD-L1 pathway can inhibit the apoptosis-inducing effect of S. maltophilia on T cells. CONCLUSIONS These indicates that T cells are inhibited after being stimulated by S. maltophilia, and then accelerated to induce death without the initiation of an immunologic cascade. This paper demonstrates for the first time the inhibitory effect of S. maltophilia on cellular immunity, and the immunosuppressive effect induced by infection of S. maltophilia should be considered.
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Affiliation(s)
- Min Wang
- Department of Laboratory Medicine, the Second Xiangya Hospital of Central South University, Changsha, Hunan, 410011, China
| | - Sheng Yin
- Department of Laboratory Medicine, the Second Xiangya Hospital of Central South University, Changsha, Hunan, 410011, China
| | - Qi Qin
- Department of Laboratory Medicine, the Second Xiangya Hospital of Central South University, Changsha, Hunan, 410011, China
| | - Yizhi Peng
- Department of Laboratory Medicine, the Second Xiangya Hospital of Central South University, Changsha, Hunan, 410011, China
| | - Zhengang Hu
- Department of Laboratory Medicine, the Second Xiangya Hospital of Central South University, Changsha, Hunan, 410011, China
| | - Xiaolin Zhu
- Department of Laboratory Medicine, the Second Xiangya Hospital of Central South University, Changsha, Hunan, 410011, China
| | - Lei Liu
- Department of Laboratory Medicine, the Second Xiangya Hospital of Central South University, Changsha, Hunan, 410011, China
| | - Xianping Li
- Department of Laboratory Medicine, the Second Xiangya Hospital of Central South University, Changsha, Hunan, 410011, China.
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