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Gao M, Zhao X. Insights into the tissue repair features of MAIT cells. Front Immunol 2024; 15:1432651. [PMID: 39086492 PMCID: PMC11289772 DOI: 10.3389/fimmu.2024.1432651] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2024] [Accepted: 07/04/2024] [Indexed: 08/02/2024] Open
Abstract
Mucosa-associated invariant T (MAIT) cells are a subset of innate-like non-conventional T cells characterized by multifunctionality. In addition to their well-recognized antimicrobial activity, increasing attention is being drawn towards their roles in tissue homeostasis and repair. However, the precise mechanisms underlying these functions remain incompletely understood and are still subject to ongoing exploration. Currently, it appears that the tissue localization of MAIT cells and the nature of the diseases or stimuli, whether acute or chronic, may induce a dynamic interplay between their pro-inflammatory and anti-inflammatory, or pathogenic and reparative functions. Therefore, elucidating the conditions and mechanisms of MAIT cells' reparative functions is crucial for fully maximizing their protective effects and advancing future MAIT-related therapies. In this review, we will comprehensively discuss the establishment and potential mechanisms of their tissue repair functions as well as the translational application prospects and current challenges in this field.
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Affiliation(s)
- Mengge Gao
- Peking University People's Hospital, Peking University Institute of Hematology, National Clinical Research Center for Hematologic Disease, Beijing Key Laboratory of Hematopoietic Stem Cell Transplantation, Beijing, China
| | - Xiaosu Zhao
- Peking University People's Hospital, Peking University Institute of Hematology, National Clinical Research Center for Hematologic Disease, Beijing Key Laboratory of Hematopoietic Stem Cell Transplantation, Beijing, China
- Research Unit of Key Technique for Diagnosis and Treatments of Hematologic Malignancies, Chinese Academy of Medical Sciences, Beijing, China
- Collaborative Innovation Center of Hematology, Peking University, Beijing, China
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2
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Bardin E, Dietrich C, Attailia M, Ferroni A, Jamet A, Lezmi G, Sermet-Gaudelus I, Leite-de-Moraes M. Restored Cytokine-Producing Capacities of Mucosal-associated Invariant T Cells in Pediatric Cystic Fibrosis Patients Treated with Elexacaftor/Tezacaftor/Ivacaftor. Am J Respir Crit Care Med 2024; 210:243-245. [PMID: 38760016 DOI: 10.1164/rccm.202401-0201le] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2024] [Accepted: 05/16/2024] [Indexed: 05/19/2024] Open
Affiliation(s)
- Emmanuelle Bardin
- Université Paris Cité, Institut National de la Santé et de la Recherche Médicale (INSERM) Unité Mixte de Recherche (UMR) 1151, Centre National de la Recherche Scientifique UMR 8253, Institut Necker Enfants Malades, Team Cystic Fibrosis and Other Epithelial Respiratory Protein Misfolding Diseases, Paris, France
- Assistance Publique-Hôpitaux de Paris, Hôpital Necker-Enfants Malades, Paris, France
- INSERM, Unité 1173, Infection et Inflammation, Université Paris-Saclay, Université de Versailles Saint-Quentin-en-Yvelines, Montigny-le-Bretonneux, France; and
| | | | | | - Agnès Ferroni
- Assistance Publique-Hôpitaux de Paris, Hôpital Necker-Enfants Malades, Paris, France
| | - Anne Jamet
- Assistance Publique-Hôpitaux de Paris, Hôpital Necker-Enfants Malades, Paris, France
- Team Pathogenesis of Systemic Infections, Université Paris Cité, INSERM UMR 1151, CNRS UMR 8253, Institut Necker Enfants Malades, Paris, France
| | - Guillaume Lezmi
- Assistance Publique-Hôpitaux de Paris, Hôpital Necker-Enfants Malades, Paris, France
- Team Immunoregulation and Immunopathology and
| | - Isabelle Sermet-Gaudelus
- Université Paris Cité, Institut National de la Santé et de la Recherche Médicale (INSERM) Unité Mixte de Recherche (UMR) 1151, Centre National de la Recherche Scientifique UMR 8253, Institut Necker Enfants Malades, Team Cystic Fibrosis and Other Epithelial Respiratory Protein Misfolding Diseases, Paris, France
- Assistance Publique-Hôpitaux de Paris, Hôpital Necker-Enfants Malades, Paris, France
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Roy S, Roy S, Halder S, Jana K, Ukil A. Leishmania exploits host cAMP/EPAC/calcineurin signaling to induce an IL-33-mediated anti-inflammatory environment for the establishment of infection. J Biol Chem 2024; 300:107366. [PMID: 38750790 PMCID: PMC11208913 DOI: 10.1016/j.jbc.2024.107366] [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: 12/01/2023] [Revised: 05/03/2024] [Accepted: 05/05/2024] [Indexed: 06/10/2024] Open
Abstract
Host anti-inflammatory responses are critical for the progression of visceral leishmaniasis, and the pleiotropic cytokine interleukin (IL)-33 was found to be upregulated in infection. Here, we documented that IL-33 induction is a consequence of elevated cAMP-mediated exchange protein activated by cAMP (EPAC)/calcineurin-dependent signaling and essential for the sustenance of infection. Leishmania donovani-infected macrophages showed upregulation of IL-33 and its neutralization resulted in decreased parasite survival and increased inflammatory responses. Infection-induced cAMP was involved in IL-33 production and of its downstream effectors PKA and EPAC, only the latter was responsible for elevated IL-33 level. EPAC initiated Rap-dependent phospholipase C activation, which triggered the release of intracellular calcium followed by calcium/calmodulin complex formation. Screening of calmodulin-dependent enzymes affirmed involvement of the phosphatase calcineurin in cAMP/EPAC/calcium/calmodulin signaling-induced IL-33 production and parasite survival. Activated calcineurin ensured nuclear localization of the transcription factors, nuclear factor of activated T cell 1 and hypoxia-inducible factor 1 alpha required for IL-33 transcription, and we further confirmed this by chromatin immunoprecipitation assay. Administering specific inhibitors of nuclear factor of activated T cell 1 and hypoxia-inducible factor 1 alpha in BALB/c mouse model of visceral leishmaniasis decreased liver and spleen parasite burden along with reduction in IL-33 level. Splenocyte supernatants of inhibitor-treated infected mice further documented an increase in tumor necrosis factor alpha and IL-12 level with simultaneous decrease of IL-10, thereby indicating an overall disease-escalating effect of IL-33. Thus, this study demonstrates that cAMP/EPAC/calcineurin signaling is crucial for the activation of IL-33 and in effect creates anti-inflammatory responses, essential for infection.
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Affiliation(s)
- Souravi Roy
- Department of Biochemistry, University of Calcutta, Kolkata, India
| | - Shalini Roy
- Department of Biochemistry, University of Calcutta, Kolkata, India
| | - Satyajit Halder
- Division of Molecular Medicine, Bose Institute, Kolkata, India
| | - Kuladip Jana
- Division of Molecular Medicine, Bose Institute, Kolkata, India
| | - Anindita Ukil
- Department of Biochemistry, University of Calcutta, Kolkata, India.
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Singh P, Száraz-Széles M, Baráth S, Hevessy Z. A Comprehensive Investigation of Stimulatory Agents on MAIT and Vα7.2+/CD161- T Cell Response and Effects of Immunomodulatory Drugs. Int J Mol Sci 2024; 25:5895. [PMID: 38892082 PMCID: PMC11172258 DOI: 10.3390/ijms25115895] [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: 04/30/2024] [Revised: 05/22/2024] [Accepted: 05/24/2024] [Indexed: 06/21/2024] Open
Abstract
Mucosal-associated invariant T (MAIT) cells, a subset of Vα7.2+ T cells, are a crucial link between innate and adaptive immunity, responding to various stimuli through TCR-dependent and independent pathways. We investigated the responses of MAIT cells and Vα7.2+/CD161- T cells to different stimuli and evaluated the effects of Cyclosporin A (CsA) and Vitamin D3 (VitD). Peripheral blood mononuclear cells (PBMCs) from healthy donors were stimulated with various agents (PMA/Ionomycin, 5-OP-RU, 5-OP-RU/IL-12/IL-33) with or without CsA and VitD. Flow cytometric analysis assessed surface markers and intracellular cytokine production. Under steady-state conditions, MAIT cells displayed elevated expression of CCR6 and IL-13. They showed upregulated activation and exhaustion markers after activation, producing IFNγ, TNFα, and TNFα/GzB. CsA significantly inhibited MAIT cell activation and cytokine production. Conversely, Vα7.2+/CD161- T cells exhibited distinct responses, showing negligible responses to 5-OP-RU ligand but increased cytokine production upon PMA stimulation. Our study underscores the distinct nature of MAIT cells compared to Vα7.2+/CD161- T cells, which resemble conventional T cells. CsA emerges as a potent immunosuppressive agent, inhibiting proinflammatory cytokine production in MAIT cells. At the same time, VitD supports MAIT cell activation and IL-13 production, shedding light on potential therapeutic avenues for immune modulation.
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Wang NI, Ninkov M, Haeryfar SMM. Classic costimulatory interactions in MAIT cell responses: from gene expression to immune regulation. Clin Exp Immunol 2023; 213:50-66. [PMID: 37279566 PMCID: PMC10324557 DOI: 10.1093/cei/uxad061] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Revised: 05/17/2023] [Accepted: 06/01/2023] [Indexed: 06/08/2023] Open
Abstract
Mucosa-associated invariant T (MAIT) cells are evolutionarily conserved, innate-like T lymphocytes with enormous immunomodulatory potentials. Due to their strategic localization, their invariant T cell receptor (iTCR) specificity for major histocompatibility complex-related protein 1 (MR1) ligands of commensal and pathogenic bacterial origin, and their sensitivity to infection-elicited cytokines, MAIT cells are best known for their antimicrobial characteristics. However, they are thought to also play important parts in the contexts of cancer, autoimmunity, vaccine-induced immunity, and tissue repair. While cognate MR1 ligands and cytokine cues govern MAIT cell maturation, polarization, and peripheral activation, other signal transduction pathways, including those mediated by costimulatory interactions, regulate MAIT cell responses. Activated MAIT cells exhibit cytolytic activities and secrete potent inflammatory cytokines of their own, thus transregulating the biological behaviors of several other cell types, including dendritic cells, macrophages, natural killer cells, conventional T cells, and B cells, with significant implications in health and disease. Therefore, an in-depth understanding of how costimulatory pathways control MAIT cell responses may introduce new targets for optimized MR1/MAIT cell-based interventions. Herein, we compare and contrast MAIT cells and mainstream T cells for their expression of classic costimulatory molecules belonging to the immunoglobulin superfamily and the tumor necrosis factor (TNF)/TNF receptor superfamily, based not only on the available literature but also on our transcriptomic analyses. We discuss how these molecules participate in MAIT cells' development and activities. Finally, we introduce several pressing questions vis-à-vis MAIT cell costimulation and offer new directions for future research in this area.
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Affiliation(s)
- Nicole I Wang
- Department of Microbiology and Immunology, Western University, London, Ontario, Canada
| | - Marina Ninkov
- Department of Microbiology and Immunology, Western University, London, Ontario, Canada
| | - S M Mansour Haeryfar
- Department of Microbiology and Immunology, Western University, London, Ontario, Canada
- Division of Clinical Immunology and Allergy, Department of Medicine, Western University, London, Ontario, Canada
- Division of General Surgery, Department of Surgery, Western University, London, Ontario, Canada
- Lawson Health Research Institute, London, Ontario, Canada
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Robin A, Mackowiak C, Bost R, Dujardin F, Barbarin A, Thierry A, Hauet T, Pellerin L, Gombert JM, Salamé E, Herbelin A, Barbier L. Early activation and recruitment of invariant natural killer T cells during liver ischemia-reperfusion: the major role of the alarmin interleukin-33. Front Immunol 2023; 14:1099529. [PMID: 37228593 PMCID: PMC10203422 DOI: 10.3389/fimmu.2023.1099529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Accepted: 04/12/2023] [Indexed: 05/27/2023] Open
Abstract
Over the past thirty years, the complexity of the αβ-T cell compartment has been enriched by the identification of innate-like T cells (ITCs), which are composed mainly of invariant natural killer T (iNKT) cells and mucosal-associated invariant T (MAIT) cells. Based on animal studies using ischemia-reperfusion (IR) models, a key role has been attributed to iNKT cells in close connection with the alarmin/cytokine interleukin (IL)-33, as early sensors of cell-stress in the initiation of acute sterile inflammation. Here we have investigated whether the new concept of a biological axis of circulating iNKT cells and IL-33 applies to humans, and may be extended to other ITC subsets, namely MAIT and γδ-T cells, in the acute sterile inflammation sequence occurring during liver transplant (LT). From a prospective biological collection of recipients, we reported that LT was accompanied by an early and preferential activation of iNKT cells, as attested by almost 40% of cells having acquired the expression of CD69 at the end of LT (i.e. 1-3 hours after portal reperfusion), as opposed to only 3-4% of conventional T cells. Early activation of iNKT cells was positively correlated with the systemic release of the alarmin IL-33 at graft reperfusion. Moreover, in a mouse model of hepatic IR, iNKT cells were activated in the periphery (spleen), and recruited in the liver in WT mice, as early as the first hour after reperfusion, whereas this phenomenon was virtually missing in IL-33-deficient mice. Although to a lesser degree than iNKT cells, MAIT and γδ-T cells also seemed targeted during LT, as attested by 30% and 10% of them acquiring CD69 expression, respectively. Like iNKT cells, and in clear contrast to γδ-T cells, activation of MAIT cells during LT was closely associated with both release of IL-33 immediately after graft reperfusion and severity of liver dysfunction occurring during the first three post-operative days. All in all, this study identifies iNKT and MAIT cells in connection with IL-33 as new key cellular factors and mechanisms of acute sterile inflammation in humans. Further investigations are required to confirm the implication of MAIT and iNKT cell subsets, and to precisely assess their functions, in the clinical course of sterile inflammation accompanying LT.
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Affiliation(s)
- Aurélie Robin
- Centre Hospitalier Universitaire de Poitiers, Institut National de la Santé Et de la Recherche Médicale, Ischemie Reperfusion Métabolisme et Inflammation Stérile en Transplantation, Université de Poitiers, Poitiers, France
| | - Claire Mackowiak
- Institut National de la Santé Et de la Recherche Médicale (INSERM), Ischemie Reperfusion Métabolisme et Inflammation Stérile en Transplantation (IRMETIST), Université de Poitiers, Poitiers, France
| | - Romain Bost
- Institut National de la Santé Et de la Recherche Médicale (INSERM), Ischemie Reperfusion Métabolisme et Inflammation Stérile en Transplantation (IRMETIST), Université de Poitiers, Poitiers, France
| | - Fanny Dujardin
- Centre Hospitalier Universitaire (CHU) Trousseau, Pathology, Tours, France
| | - Alice Barbarin
- Centre Hospitalier Universitaire de Poitiers, Institut National de la Santé Et de la Recherche Médicale, Ischemie Reperfusion Métabolisme et Inflammation Stérile en Transplantation, Université de Poitiers, Poitiers, France
| | - Antoine Thierry
- Université de Poitiers, Institut National de la Santé Et de la Recherche Médicale (INSERM), Ischemie Reperfusion Métabolisme et Inflammation Stérile en Transplantation (IRMETIST), Centre Hospitalier Universitaire (CHU) de Poitiers, Nephrology, Poitiers, France
| | - Thierry Hauet
- Université de Poitiers, Institut National de la Santé Et de la Recherche Médicale (INSERM), Ischemie Reperfusion Métabolisme et Inflammation Stérile en Transplantation (IRMETIST), Centre Hospitalier Universitaire (CHU) de Poitiers, Biochemistry, Poitiers, France
| | - Luc Pellerin
- Université de Poitiers, Institut National de la Santé Et de la Recherche Médicale (INSERM), Ischemie Reperfusion Métabolisme et Inflammation Stérile en Transplantation (IRMETIST), Centre Hospitalier Universitaire (CHU) de Poitiers, Biochemistry, Poitiers, France
| | - Jean-Marc Gombert
- Université de Poitiers, Institut National de la Santé Et de la Recherche Médicale (INSERM), Ischemie Reperfusion Métabolisme et Inflammation Stérile en Transplantation (IRMETIST), Centre Hospitalier Universitaire (CHU) de Poitiers, Immunology, Poitiers, France
| | - Ephrem Salamé
- Université de Tours, Centre Hospitalier Universitaire (CHU) Trousseau, Digestive Surgery and Liver Transplantation, Institut National de la Santé Et de la Recherche Médicale (INSERM), Ischemie Reperfusion Métabolisme et Inflammation Stérile en Transplantation (IRMETIST), Tours, France
| | - André Herbelin
- Institut National de la Santé Et de la Recherche Médicale (INSERM), Ischemie Reperfusion Métabolisme et Inflammation Stérile en Transplantation (IRMETIST), Université de Poitiers, Poitiers, France
| | - Louise Barbier
- Université de Tours, Centre Hospitalier Universitaire (CHU) Trousseau, Digestive Surgery and Liver Transplantation, Institut National de la Santé Et de la Recherche Médicale (INSERM), Ischemie Reperfusion Métabolisme et Inflammation Stérile en Transplantation (IRMETIST), Tours, France
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Ruf B, Greten TF, Korangy F. Innate lymphoid cells and innate-like T cells in cancer - at the crossroads of innate and adaptive immunity. Nat Rev Cancer 2023; 23:351-371. [PMID: 37081117 DOI: 10.1038/s41568-023-00562-w] [Citation(s) in RCA: 13] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 03/13/2023] [Indexed: 04/22/2023]
Abstract
Immunotherapies targeting conventional T cells have revolutionized systemic treatment for many cancers, yet only a subset of patients benefit from these approaches. A better understanding of the complex immune microenvironment of tumours is needed to design the next generation of immunotherapeutics. Innate lymphoid cells (ILCs) and innate-like T cells (ILTCs) are abundant, tissue-resident lymphocytes that have recently been shown to have critical roles in many types of cancers. ILCs and ILTCs rapidly respond to changes in their surrounding environment and act as the first responders to bridge innate and adaptive immunity. This places ILCs and ILTCs as pivotal orchestrators of the final antitumour immune response. In this Review, we outline hallmarks of ILCs and ILTCs and discuss their emerging role in antitumour immunity, as well as the pathophysiological adaptations leading to their pro-tumorigenic function. We explore the pleiotropic, in parts redundant and sometimes opposing, mechanisms that underlie the delicate interplay between the different subsets of ILCs and ILTCs. Finally, we highlight their role in amplifying and complementing conventional T cell functions and summarize immunotherapeutic strategies for targeting ILCs and ILTCs in cancer.
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Affiliation(s)
- Benjamin Ruf
- Gastrointestinal Malignancy Section, Thoracic and Gastrointestinal Malignancies Branch, Centre for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Tim F Greten
- Gastrointestinal Malignancy Section, Thoracic and Gastrointestinal Malignancies Branch, Centre for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
- NCI CCR Liver Cancer Program, National Institutes of Health, Bethesda, MD, USA
| | - Firouzeh Korangy
- Gastrointestinal Malignancy Section, Thoracic and Gastrointestinal Malignancies Branch, Centre for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA.
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Zhang Y, Wang M, Zhang X, Tang K, Zhang C, Jia X, Hu H, Liu H, Li N, Zhuang R, Jin B, Ma Y, Zhang Y. HTNV infection induces activation and deficiency of CD8+MAIT cells in HFRS patients. Clin Exp Immunol 2023; 211:1-14. [PMID: 36480318 PMCID: PMC9993462 DOI: 10.1093/cei/uxac111] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Revised: 10/19/2022] [Accepted: 12/02/2022] [Indexed: 12/14/2022] Open
Abstract
Hantaan virus (HTNV) infection causes an epidemic of hemorrhagic fever with renal syndrome (HFRS) mainly in Asia. Mucosal-associated invariant T (MAIT) cells are innate-like T lymphocytes known to play an important role in innate host defense during virus infection. However, their roles and phenotypes during HTNV infection have not yet been explored. We characterized CD8+MAIT cells from HFRS patients based on scRNA-seq data combined with flow cytometry data. We showed that HTNV infection caused the loss and activation of CD8+MAIT cells in the peripheral blood, which were correlated with disease severity. The production of granzyme B and IFN-γ from CD8+MAIT cells and the limitation of HTNV replication in endothelia cells indicated the anti-viral property of CD8+MAIT cells. In addition, in vitro infection of MAIT cells by HTNV or HTNV-exposed monocytes showed that the activation of MAIT cells was IL-18 mediated. In conclusion, this study identified, for the first time, gene expression profiles of MAIT cells, provided underlying molecular mechanisms for activation of MAIT cells during HTNV infection, and suggested a potential anti-viral role of MAIT cells in HFRS.
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Affiliation(s)
- Yusi Zhang
- Department of Immunology, School of Basic Medicine, Fourth Military Medical University, Xi’an 710032, China
| | - Meng Wang
- Department of Immunology, School of Basic Medicine, Fourth Military Medical University, Xi’an 710032, China
- Department of Immunology, School of Basic Medical Sciences, Yan’an university, Yan’an 716000, China
| | - Xiyue Zhang
- Department of Immunology, School of Basic Medicine, Fourth Military Medical University, Xi’an 710032, China
- Department of Pathogenic Biology, School of Basic Medical Sciences, Yan’an university, Yan’an 716000, China
| | - Kang Tang
- Department of Immunology, School of Basic Medicine, Fourth Military Medical University, Xi’an 710032, China
| | - Chunmei Zhang
- Department of Immunology, School of Basic Medicine, Fourth Military Medical University, Xi’an 710032, China
| | | | - Haifeng Hu
- Center for Infectious Diseases, Second Affiliated Hospital of Air Force Medical University (Fourth Military Medical University), Xi’an 710038, China
| | - He Liu
- Department of Microbiology, School of Basic Medicine, Fourth Military Medical University, Xi΄an 710032, China
| | - Na Li
- Department of Transfusion Medicine, Xijing Hospital, Fourth Military Medical University, Xi’an 710032, Shaanxi, China
| | - Ran Zhuang
- Department of Immunology, School of Basic Medicine, Fourth Military Medical University, Xi’an 710032, China
| | - Boquan Jin
- Department of Immunology, School of Basic Medicine, Fourth Military Medical University, Xi’an 710032, China
| | - Ying Ma
- Department of Immunology, School of Basic Medicine, Fourth Military Medical University, Xi’an 710032, China
| | - Yun Zhang
- Department of Immunology, School of Basic Medicine, Fourth Military Medical University, Xi’an 710032, China
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Shimizu Y, Horigane-Konakai Y, Ishii Y, Sugimoto C, Wakao H. Mucosal-associated invariant T cells repress group 2 innate lymphoid cells in Alternaria alternata-induced model of allergic airway inflammation. Front Immunol 2022; 13:1005226. [PMID: 36458017 PMCID: PMC9706205 DOI: 10.3389/fimmu.2022.1005226] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Accepted: 10/27/2022] [Indexed: 08/13/2023] Open
Abstract
Mucosal-associated invariant T (MAIT) cells, a blossoming member of the innate-like T cells, play a pivotal role in host defense through engaging the mucosal immunity. Although it has been suggested that MAIT cells are somehow implicated in the allergic airway inflammation mediated by group 2 innate lymphoid cells (ILC2s) such as asthma, the precise role(s) of MAIT cells in such inflammation has remained elusive. To explore the possible roles of MAIT cells in the inflammation, we examined whether MAIT cells suppressed the production of T helper (Th) 2 and inflammatory cytokines from ILC2s, and constrained the proliferation of ILC2s, both of which are prerequisite for airway inflammation. Given that laboratory mice are poor at MAIT cells, a novel mouse line rich in MAIT cells was used. We found that mice rich in MAIT cells showed alleviated airway inflammation as evidenced by reduced infiltration of the immune cells and hyperplasia in goblet cells in the lung concomitant with compromised production of Th2 and inflammatory cytokines, while wild type mice exhibited severe inflammation upon challenge with the fungal extracts. In vitro coculture experiments using purified ILC2s and MAIT cells unrevealed that cytokine-stimulated MAIT cells suppressed ILC2s to produce the cytokines as well as to proliferate most likely via production of IFN-γ. Furthermore, reconstitution of the allergic airway inflammation in the highly immunocompromised mice showed that ILC2-mediated inflammation was alleviated in mice that received MAIT cells along with ILC2s. We concluded that MAIT cells played a crucial role in suppressing the cytokine-producing capacity of ILC2s and ILC2 proliferation, that ultimately led to decrease in the allergic airway inflammation. The results open up a novel therapeutic horizon in ILC2-mediated inflammatory diseases by modulating MAIT cell activity.
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Affiliation(s)
- Yasuo Shimizu
- Department of Pulmonary Medicine and Clinical Immunology, Dokkyo Medical University, Mibu, Tochigi, Japan
- Respiratory Endoscopy Center, Dokkyo Medical University Hospital, Mibu, Tochigi, Japan
| | - Yukiko Horigane-Konakai
- Department of Pulmonary Medicine and Clinical Immunology, Dokkyo Medical University, Mibu, Tochigi, Japan
| | - Yoshii Ishii
- Department of Pulmonary Medicine and Clinical Immunology, Dokkyo Medical University, Mibu, Tochigi, Japan
| | - Chie Sugimoto
- Host Defense Division, Research Center for Advanced Medical Science, Dokkyo Medical University, Mibu, Tochigi, Japan
| | - Hiroshi Wakao
- Host Defense Division, Research Center for Advanced Medical Science, Dokkyo Medical University, Mibu, Tochigi, Japan
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