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Wilkin C, Piette J, Legrand-Poels S. Unravelling metabolic factors impacting iNKT cell biology in obesity. Biochem Pharmacol 2024; 228:116436. [PMID: 39029630 DOI: 10.1016/j.bcp.2024.116436] [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: 04/26/2024] [Revised: 07/01/2024] [Accepted: 07/15/2024] [Indexed: 07/21/2024]
Abstract
Obesity and related diseases have reached epidemic proportions and continue to rise. Beyond creating an economical burden, obesity and its co-morbidities are associated with shortened human life expectancy. Despite major advances, the underlying mechanisms of obesity remain not fully elucidated. Recently, several studies have highlighted that various immune cells are metabolically reprogrammed in obesity, thereby profoundly affecting the immune system. This sheds light on a new field of interest: the impact of obesity-related systemic metabolic changes affecting immune system that could lead to immunosurveillance loss. Among immune cells altered by obesity, invariant Natural Killer T (iNKT) cells have recently garnered intense focus due to their ability to recognize lipid antigen. While iNKT cells are well-described to be affected by obesity, how and to what extent immunometabolic factors (e.g., lipids, glucose, cytokines, adipokines, insulin and free fatty acids) can drive iNKT cells alterations remains unclear, but represent an emerging field of research. Here, we review the current knowledge on iNKT cells in obesity and discuss the immunometabolic factors that could modulate their phenotype and activity.
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Affiliation(s)
- Chloé Wilkin
- Laboratory of Immunometabolism and Nutrition, GIGA, ULiège, Liège, Belgium.
| | - Jacques Piette
- Laboratory of Virology and Immunology, GIGA, ULiège, Liège, Belgium
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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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Lin Q, Kuypers M, Baglaenko Y, Cao E, Hezaveh K, Despot T, de Amat Herbozo C, Cruz Tleugabulova M, Umaña JM, McGaha TL, Philpott DJ, Mallevaey T. The intestinal microbiota modulates the transcriptional landscape of iNKT cells at steady-state and following antigen exposure. Mucosal Immunol 2024; 17:226-237. [PMID: 38331095 DOI: 10.1016/j.mucimm.2024.02.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2023] [Revised: 01/30/2024] [Accepted: 02/01/2024] [Indexed: 02/10/2024]
Abstract
Invariant Natural Killer T (iNKT) cells are unconventional T cells that respond to microbe-derived glycolipid antigens. iNKT cells exert fast innate effector functions that regulate immune responses in a variety of contexts, including during infection, cancer, or inflammation. The roles these unconventional T cells play in intestinal inflammation remain poorly defined and vary based on the disease model and species. Our previous work suggested that the gut microbiota influenced iNKT cell functions during dextran sulfate sodium-induced colitis in mice. This study, shows that iNKT cell homeostasis and response following activation are altered in germ-free mice. Using prenatal fecal transplant in specific pathogen-free mice, we show that the transcriptional signatures of iNKT cells at steady state and following αGC-mediated activation in vivo are modulated by the microbiota. Our data suggest that iNKT cells sense the microbiota at homeostasis independently of their T cell receptors. Finally, iNKT cell transcriptional signatures are different in male and female mice. Collectively, our findings suggest that sex and the intestinal microbiota are important factors that regulate iNKT cell homeostasis and responses. A deeper understanding of microbiota-iNKT cell interactions and the impact of sex could improve the development of iNKT cell-based immunotherapies.
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Affiliation(s)
- Qiaochu Lin
- Department of Immunology, University of Toronto, Toronto, Ontario, Canada
| | - Meggie Kuypers
- Department of Immunology, University of Toronto, Toronto, Ontario, Canada
| | - Yuriy Baglaenko
- Center for Autoimmune Genomics and Etiology, Division of Genetics, Cincinnati Children's Hospital, Cincinnati, OH, USA
| | - Eric Cao
- Department of Immunology, University of Toronto, Toronto, Ontario, Canada
| | - Kebria Hezaveh
- Department of Immunology, University of Toronto, Toronto, Ontario, Canada; Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario, Canada
| | - Tijana Despot
- Department of Immunology, University of Toronto, Toronto, Ontario, Canada
| | | | | | | | - Tracy L McGaha
- Department of Immunology, University of Toronto, Toronto, Ontario, Canada; Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario, Canada
| | - Dana J Philpott
- Department of Immunology, University of Toronto, Toronto, Ontario, Canada
| | - Thierry Mallevaey
- Department of Immunology, University of Toronto, Toronto, Ontario, Canada.
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Kurioka A, Klenerman P. Aging unconventionally: γδ T cells, iNKT cells, and MAIT cells in aging. Semin Immunol 2023; 69:101816. [PMID: 37536148 PMCID: PMC10804939 DOI: 10.1016/j.smim.2023.101816] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Revised: 07/19/2023] [Accepted: 07/20/2023] [Indexed: 08/05/2023]
Abstract
Unconventional T cells include γδ T cells, invariant Natural Killer T cells (iNKT) cells and Mucosal Associated Invariant T (MAIT) cells, which are distinguished from conventional T cells by their recognition of non-peptide ligands presented by non-polymorphic antigen presenting molecules and rapid effector functions that are pre-programmed during their development. Here we review current knowledge of the effect of age on unconventional T cells, from early life to old age, in both mice and humans. We then discuss the role of unconventional T cells in age-associated diseases and infections, highlighting the similarities between members of the unconventional T cell family in the context of aging.
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Affiliation(s)
- Ayako Kurioka
- Nuffield Department of Medicine, University of Oxford, Oxford, UK.
| | - Paul Klenerman
- Nuffield Department of Medicine, University of Oxford, Oxford, UK; Translational Gastroenterology Unit, University of Oxford, Oxford, UK
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Er-Lukowiak M, Hansen C, Lotter H. Sex Difference in Amebiasis. Curr Top Microbiol Immunol 2023; 441:209-224. [PMID: 37695430 DOI: 10.1007/978-3-031-35139-6_8] [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] [Indexed: 09/12/2023]
Abstract
Infection with the protozoan parasite Entamoeba histolytica is much more likely to cause severe, focal liver damage in males than females, although the infection rate is the same in both sexes. The differences in disease susceptibility may be due to modulation of key mechanisms of the innate immune response by sex hormones. Complement-mediated mechanisms and estrogen-dependent activated natural killer T cells lead to early elimination of the parasite in females, whereas a pathological immune axis is triggered in males. Testosterone, which is generally thought to have more immunosuppressive properties on cells of the immune response, leads to overwhelming activation of monocytes and host-dependent destruction of liver tissue in males resulting in worse outcomes.
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Affiliation(s)
- Marco Er-Lukowiak
- Department Interface - RG Molecular Infection Immunology, Bernhard Nocht Institute for Tropical Medicine, Hamburg, Germany
| | - Charlotte Hansen
- Department Interface - RG Molecular Infection Immunology, Bernhard Nocht Institute for Tropical Medicine, Hamburg, Germany
| | - Hanna Lotter
- Department Interface - RG Molecular Infection Immunology, Bernhard Nocht Institute for Tropical Medicine, Hamburg, Germany.
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McCombe PA, Hardy TA, Nona RJ, Greer JM. Sex differences in Guillain Barré syndrome, chronic inflammatory demyelinating polyradiculoneuropathy and experimental autoimmune neuritis. Front Immunol 2022; 13:1038411. [PMID: 36569912 PMCID: PMC9780466 DOI: 10.3389/fimmu.2022.1038411] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2022] [Accepted: 11/24/2022] [Indexed: 12/13/2022] Open
Abstract
Guillain Barré syndrome (GBS) and its variants, and chronic inflammatory demyelinating polyradiculoneuropathy (CIDP and its variants, are regarded as immune mediated neuropathies. Unlike in many autoimmune disorders, GBS and CIDP are more common in males than females. Sex is not a clear predictor of outcome. Experimental autoimmune neuritis (EAN) is an animal model of these diseases, but there are no studies of the effects of sex in EAN. The pathogenesis of GBS and CIDP involves immune response to non-protein antigens, antigen presentation through non-conventional T cells and, in CIDP with nodopathy, IgG4 antibody responses to antigens. There are some reported sex differences in some of these elements of the immune system and we speculate that these sex differences could contribute to the male predominance of these diseases, and suggest that sex differences in peripheral nerves is a topic worthy of further study.
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Affiliation(s)
- Pamela A. McCombe
- Centre for Clinical Research, The University of Queensland, Brisbane, QLD, Australia
| | - Todd A. Hardy
- Department of Neurology, Concord Hospital, University of Sydney, Sydney, NSW, Australia
- Brain & Mind Centre, University of Sydney, Sydney, NSW, Australia
| | - Robert J. Nona
- Centre for Clinical Research, The University of Queensland, Brisbane, QLD, Australia
| | - Judith M. Greer
- Centre for Clinical Research, The University of Queensland, Brisbane, QLD, Australia
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