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Shera S, Katzka W, Yang JC, Chang C, Arias-Jayo N, Lagishetty V, Balioukova A, Chen Y, Dutson E, Li Z, Mayer EA, Pisegna JR, Sanmiguel C, Pawar S, Zhang D, Leitman M, Hernandez L, Jacobs JP, Dong TS. Bariatric-induced microbiome changes alter MASLD development in association with changes in the innate immune system. Front Microbiol 2024; 15:1407555. [PMID: 39184030 PMCID: PMC11342267 DOI: 10.3389/fmicb.2024.1407555] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2024] [Accepted: 07/26/2024] [Indexed: 08/27/2024] Open
Abstract
Introduction Metabolic dysfunction-associated steatotic liver disease (MASLD) affects nearly 25% of the population and is the leading cause for liver-related mortality. Bariatric surgery is a well-known treatment for MASLD and obesity. Understanding the fundamental mechanisms by which bariatric surgery can alter MASLD can lead to new avenues of therapy and research. Previous studies have identified the microbiome's role in bariatric surgery and in inflammatory immune cell populations. The host innate immune system modulates hepatic inflammation and fibrosis, and thus the progression of MASLD. The precise role of immune cell types in the pathogenesis of MASLD remains an active area of investigation. The aim of this study was to understand the interplay between microbiota composition post-bariatric surgery and the immune system in MASLD. Methods Eighteen morbidly obese females undergoing sleeve gastrectomy were followed pre-and post-surgery. Stool from four patients, showing resolved MASLD post-surgery with sustained weight loss, was transplanted into antibiotic treated mice. Mice received pre-or post-surgery stool and were fed a standard or high-fat diet. Bodyweight, food intake, and physiological parameters were tracked weekly. Metabolic parameters were measured post-study termination. Results The human study revealed that bariatric surgery led to significant weight loss (p > 0.05), decreased inflammatory markers, and improved glucose levels six months post-surgery. Patients with weight loss of 20% or more showed distinct changes in blood metabolites and gut microbiome composition, notably an increase in Bacteroides. The mouse model confirmed surgery-induced microbiome changes to be a major factor in the reduction of markers and attenuation of MASLD progression. Mice receiving post-surgery fecal transplants had significantly less weight gain and liver steatosis compared to pre-surgery recipients. There was also a significant decrease in inflammatory cytokines interferon gamma, interleukin 2, interleukin 15, and mig. This was accompanied by alterations in liver immunophenotype, including an increase in natural killer T cells and reduction of Kupfer cells in the post-surgery transplant group. Discussion Our findings suggest surgery induced microbial changes significantly reduce inflammatory markers and fatty liver progression. The results indicate a potential causal link between the microbiome and the host immune system, possibly mediated through modulation of liver NKT and Kupffer cells.
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Affiliation(s)
- Simer Shera
- The Vatche and Tamar Manoukian Division of Digestive Diseases, Department of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA, United States
| | - William Katzka
- The Vatche and Tamar Manoukian Division of Digestive Diseases, Department of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA, United States
| | - Julianne C. Yang
- The Vatche and Tamar Manoukian Division of Digestive Diseases, Department of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA, United States
| | - Candace Chang
- The Vatche and Tamar Manoukian Division of Digestive Diseases, Department of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA, United States
| | - Nerea Arias-Jayo
- The Vatche and Tamar Manoukian Division of Digestive Diseases, Department of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA, United States
| | - Venu Lagishetty
- The Vatche and Tamar Manoukian Division of Digestive Diseases, Department of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA, United States
- UCLA Microbiome Center, David Geffen School of Medicine at UCLA, Los Angeles, CA, United States
| | - Anna Balioukova
- Department of Surgery, UCLA Center for Obesity and METabolic Health (COMET), Los Angeles, CA, United States
- David Geffen School of Medicine at UCLA, Los Angeles, CA, United States
| | - Yijun Chen
- Department of Surgery, UCLA Center for Obesity and METabolic Health (COMET), Los Angeles, CA, United States
- David Geffen School of Medicine at UCLA, Los Angeles, CA, United States
| | - Erik Dutson
- Department of Surgery, UCLA Center for Obesity and METabolic Health (COMET), Los Angeles, CA, United States
- David Geffen School of Medicine at UCLA, Los Angeles, CA, United States
| | - Zhaoping Li
- Division of Gastroenterology, Hepatology and Parenteral Nutrition, VA Greater Los Angeles Healthcare System, Los Angeles, CA, United States
- UCLA Center for Human Nutrition, University of California, Los Angeles, Los Angeles, CA, United States
| | - Emeran A. Mayer
- The Vatche and Tamar Manoukian Division of Digestive Diseases, Department of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA, United States
- UCLA Microbiome Center, David Geffen School of Medicine at UCLA, Los Angeles, CA, United States
- G. Oppenheimer Center for Neurobiology of Stress and Resilience, University of California, Los Angeles, Los Angeles, CA, United States
| | - Joseph R. Pisegna
- The Vatche and Tamar Manoukian Division of Digestive Diseases, Department of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA, United States
- Division of Gastroenterology, Hepatology and Parenteral Nutrition, VA Greater Los Angeles Healthcare System, Los Angeles, CA, United States
| | - Claudia Sanmiguel
- The Vatche and Tamar Manoukian Division of Digestive Diseases, Department of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA, United States
- Division of Gastroenterology, Hepatology and Parenteral Nutrition, VA Greater Los Angeles Healthcare System, Los Angeles, CA, United States
- G. Oppenheimer Center for Neurobiology of Stress and Resilience, University of California, Los Angeles, Los Angeles, CA, United States
| | - Shrey Pawar
- The Vatche and Tamar Manoukian Division of Digestive Diseases, Department of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA, United States
| | - David Zhang
- The Vatche and Tamar Manoukian Division of Digestive Diseases, Department of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA, United States
| | - Madelaine Leitman
- The Vatche and Tamar Manoukian Division of Digestive Diseases, Department of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA, United States
| | - Laura Hernandez
- The Vatche and Tamar Manoukian Division of Digestive Diseases, Department of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA, United States
| | - Jonathan P. Jacobs
- The Vatche and Tamar Manoukian Division of Digestive Diseases, Department of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA, United States
- UCLA Microbiome Center, David Geffen School of Medicine at UCLA, Los Angeles, CA, United States
- Division of Gastroenterology, Hepatology and Parenteral Nutrition, VA Greater Los Angeles Healthcare System, Los Angeles, CA, United States
- G. Oppenheimer Center for Neurobiology of Stress and Resilience, University of California, Los Angeles, Los Angeles, CA, United States
| | - Tien S. Dong
- The Vatche and Tamar Manoukian Division of Digestive Diseases, Department of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA, United States
- UCLA Microbiome Center, David Geffen School of Medicine at UCLA, Los Angeles, CA, United States
- Division of Gastroenterology, Hepatology and Parenteral Nutrition, VA Greater Los Angeles Healthcare System, Los Angeles, CA, United States
- G. Oppenheimer Center for Neurobiology of Stress and Resilience, University of California, Los Angeles, Los Angeles, CA, United States
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Qi X, Li Z, Han J, Liu W, Xia P, Cai X, Liu X, Liu X, Zhang J, Yu P. Multifaceted roles of T cells in obesity and obesity-related complications: A narrative review. Obes Rev 2023; 24:e13621. [PMID: 37583087 DOI: 10.1111/obr.13621] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Revised: 03/18/2023] [Accepted: 07/19/2023] [Indexed: 08/17/2023]
Abstract
Obesity is characterized by chronic low-grade inflammatory responses in the adipose tissue, accompanied by pronounced insulin resistance and metabolic anomalies. It affects almost all body organs and eventually leads to diseases such as fatty liver disease, type 2 diabetes mellitus, and atherosclerosis. Recently, T cells have emerged as interesting therapeutic targets because the dysfunction of T cells and their cytokines in the adipose tissue is implicated in obesity-induced inflammation and their complicated onset. Although several recent narrative reviews have provided a brief overview of related evidence in this area, they have mainly focused on either obesity-associated T cell metabolism or modulation of T cell activation in obesity. Moreover, at present, no published review has reported on the multifaceted roles of T cells in obesity and obesity-related complications, even though there has been a significant increase in studies on this topic since 2019. Therefore, this narrative review aims to comprehensively summarize current advances in the mechanistic roles of T cells in the development of obesity and its related complications. Further, we aim to discuss relevant drugs for weight loss as well as the contradictory role of T cells in the same disease so as to highlight key findings regarding this topic and provide a valid basis for future treatment strategies.
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Affiliation(s)
- Xinrui Qi
- The Second Clinical Medical College of Nanchang University, The Second Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, China
- Queen Mary School, Nanchang University, Nanchang, Jiangxi, China
| | - Zhangwang Li
- The Second Clinical Medical College of Nanchang University, The Second Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, China
| | - Jiashu Han
- MD Program, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
| | - Wenqing Liu
- Queen Mary School, Nanchang University, Nanchang, Jiangxi, China
| | - Panpan Xia
- Department of Endocrinology and Metabolism, The Second Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, China
| | - Xia Cai
- Department of Endocrinology and Metabolism, The Second Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, China
| | - Xiao Liu
- Department of Cardiology, The Second Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Xu Liu
- Department of Neurology, The Second Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, China
| | - Jing Zhang
- Department of Anesthesiology, The Second Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, China
| | - Peng Yu
- Department of Endocrinology and Metabolism, The Second Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, China
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3
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Tomas L, Katra P, Badn W, Andersson L, Nilsson J, Schiopu A, Engelbertsen D, Gonçalves I, Bengtsson E, Björkbacka H. Invariant natural killer T cells and incidence of first-time coronary events: a nested case-control study. EUROPEAN HEART JOURNAL OPEN 2023; 3:oead094. [PMID: 38025652 PMCID: PMC10630548 DOI: 10.1093/ehjopen/oead094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Revised: 08/17/2023] [Accepted: 09/20/2023] [Indexed: 12/01/2023]
Abstract
Aims Invariant natural killer T (iNKT) cells, a T cell subset that is CD1d-restricted and expresses a semi-invariant T cell receptor, have been proposed to contribute to dyslipidaemia-driven cardiovascular disease due to their ability to specifically recognize lipid antigens. Studies in mice have attributed pro-atherogenic properties to iNKT cells, but studies in humans investigating associations of iNKT cells with incident coronary events (CE) are lacking. Methods and results Here, we used flow cytometry to enumerate circulating iNKT cells (CD3+ CD1d-PBS57-Tetramer+) in a case-control cohort nested within the prospective population-based Malmö Diet and Cancer Study (n = 416) to explore associations with incident first-time CE during a median follow-up of 14 years. We found a significant inverse association between CD4- and CD8- double negative (DN) iNKT cells and incident CE, with an odds ratio of 0.62 [95% confidence interval (CI) 0.38-0.99; P = 0.046] comparing the highest vs. the lowest tertile of DN iNKT cells. The association remained significant after adjustment for cardiovascular risk factors with an odds ratio of 0.57 (95% CI 0.33-0.99; P = 0.046). In contrast, total iNKT cells were not significantly associated with incident CE after adjustment, with an odds ratio of 0.74 (95% CI 0.43-1.27; P = 0.276). Conclusion Our findings indicate that animal studies suggesting an atherosclerosis-promoting role for iNKT cells may not translate to human cardiovascular disease as our data show an association between high circulating numbers of DN iNKT cells and decreased risk of incident CE.
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Affiliation(s)
- Lukas Tomas
- Department of Clinical Sciences Malmö, Lund University, Jan Waldenströms gata 35, SE-214 28, Malmö, Sweden
| | - Pernilla Katra
- Department of Clinical Sciences Malmö, Lund University, Jan Waldenströms gata 35, SE-214 28, Malmö, Sweden
| | - Wiaam Badn
- Department of Clinical Sciences Malmö, Lund University, Jan Waldenströms gata 35, SE-214 28, Malmö, Sweden
| | - Linda Andersson
- Department of Clinical Sciences Malmö, Lund University, Jan Waldenströms gata 35, SE-214 28, Malmö, Sweden
| | - Jan Nilsson
- Department of Clinical Sciences Malmö, Lund University, Jan Waldenströms gata 35, SE-214 28, Malmö, Sweden
| | - Alexandru Schiopu
- Department of Translational Medicine, Lund University, Malmö, Sweden
- Department of Internal Medicine, Skåne University Hospital, Lund, Sweden
| | - Daniel Engelbertsen
- Department of Clinical Sciences Malmö, Lund University, Jan Waldenströms gata 35, SE-214 28, Malmö, Sweden
| | - Isabel Gonçalves
- Department of Clinical Sciences Malmö, Lund University, Jan Waldenströms gata 35, SE-214 28, Malmö, Sweden
- Department of Cardiology, Skåne University Hospital, Malmö, Sweden
| | - Eva Bengtsson
- Department of Clinical Sciences Malmö, Lund University, Jan Waldenströms gata 35, SE-214 28, Malmö, Sweden
- Faculty of Health and Society, Malmö University, Malmö, Sweden
- Biofilms – Research Center for Biointerfaces, Malmö University, Malmö, Sweden
| | - Harry Björkbacka
- Department of Clinical Sciences Malmö, Lund University, Jan Waldenströms gata 35, SE-214 28, Malmö, Sweden
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Chakrabarti R, Duddu S, Tiwari A, Naidu KT, Sharma P, Chakravorty N, Shukla PC. Natural Killer T cells and the invariant subset promote atherosclerosis: A meta-analysis. Life Sci 2023; 321:121620. [PMID: 37011534 DOI: 10.1016/j.lfs.2023.121620] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Revised: 03/13/2023] [Accepted: 03/21/2023] [Indexed: 04/04/2023]
Abstract
AIMS Natural Killer T (NKT) cells are reported to be both pro- and anti-atherosclerotic. With this meta-analysis, we evaluated the NKT population and their subsets in regulating the atherosclerotic disease in mice. MAIN METHODS Eighteen pre-clinical (mice, n = 1276) and 6 clinical observational studies (humans, n = 116) met the eligibility criteria for inclusion. Random effects model was used and standard mean difference (SMD) was calculated for the cell counts and aortic lesion area. KEY FINDINGS Lesion area decreased in the absence of whole NKT cell population (-1.33[95%CI, -2.14, -0.52]), and in the absence of only iNKT subset (-0.66[95%CI, -1.69, 0.37]). However, lesion area increased after over-expression/activation of iNKTs (1.40[95%CI, 0.28, 2.52]). Atherogenic diet (AD) or high fat diet (HFD) increased the number of NKT cells (2.51[95%CI, 1.42, 3.61]), whereas the iNKT cell numbers and iNKT cell-specific gene expression decreased in mice (-2.04[95%CI, -3.34, -0.75]) and atherosclerotic patients (-1.81[95 % CI, -2.89, -0.74]). SIGNIFICANCE Here we show that, NKT and iNKT cells promote atherosclerosis. In general, NKT cell population increases with the progression of the plaque in mice and the numbers of iNKT cells reduce once the disease is established both in mice and humans.
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Feng X, Zhang Y, Du M, Li S, Ding J, Wang J, Wang Y, Liu P. Identification of diagnostic biomarkers and therapeutic targets in peripheral immune landscape from coronary artery disease. J Transl Med 2022; 20:399. [PMID: 36064568 PMCID: PMC9444127 DOI: 10.1186/s12967-022-03614-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2022] [Accepted: 08/24/2022] [Indexed: 11/10/2022] Open
Abstract
Background Peripheral biomarkers are increasingly vital non-invasive methods for monitoring coronary artery disease (CAD) progression. Their superiority in early detection, prognosis evaluation and classified diagnosis is becoming irreplaceable. Nevertheless, they are still less explored. This study aimed to determine and validate the diagnostic and therapeutic values of differentially expressed immune-related genes (DE-IRGs) in CAD. Methods We downloaded clinical information and RNA sequence data from the GEO database. We used R software, GO, KEGG and Cytoscape to analyze and visualize the data. A LASSO method was conducted to identify key genes for diagnostic model construction. The ssGSEA analysis was used to investigate the differential immune cell infiltration. Besides, we constructed CAD mouse model (low-density lipoprotein receptor deficient mice with high fat diet) to discover the correlation between the screened genes and severe CAD progress. We further uncovered the role of IL13RA1 might play in atherosclerosis. Results A total of 762 differential genes were identified between the peripheral blood of 218 controls and 199 CAD patients, which were significantly associated with infection, immune response and neural activity. 58 DE-IRGs were obtained by overlapping the differentially expressed genes(DEGs) and immune-related genes downloaded from ImmpDb database. Through LASSO regression, CCR9, CER1, CSF2, IL13RA1, INSL5, MBL2, MMP9, MSR1, NTS, TNFRSF19, CXCL2, HTR3C, IL1A, and NR4A2 were distinguished as peripheral biomarkers of CAD with eligible diagnostic capabilities in the training set (AUC = 0.968) and test set (AUC = 0.859). The ssGSEA analysis showed that the peripheral immune cells had characteristic distribution in CAD and also close relationship with specific DE-IRGs. RT-qPCR test showed that CCR9, CSF2, IL13RA1, and NTS had a significant correlation with LDLR−/− mice. IL13RA1 knocked down in RAW264.7 cell lines decreased SCARB1 and ox-LDL-stimulated CD36 mRNA expression, TGF-β, VEGF-C and α-SMA protein levels and increased the production of IL-6, with downregulation of JAK1/STAT3 signal pathway. Conclusions We constructed a diagnostic model of advanced-stage CAD based on the screened 14 DE-IRGs. We verified 4 genes of them to have a strong correlation with CAD, and IL13RA1 might participate in the inflammation, fibrosis, and cholesterol efflux process of atherosclerosis by regulating JAK1/STAT3 pathway. Supplementary Information The online version contains supplementary material available at 10.1186/s12967-022-03614-1.
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Affiliation(s)
- Xiaoteng Feng
- Department of Cardiology, Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Yifan Zhang
- Department of Cardiology, Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Min Du
- Department of Cardiology, Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Sijin Li
- Department of Cardiology, Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Jie Ding
- Department of Cardiology, Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Jiarou Wang
- Department of Cardiology, Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Yiru Wang
- Department of Cardiology, Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Ping Liu
- Department of Cardiology, Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China.
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Potential role of perivascular adipose tissue in modulating atherosclerosis. Clin Sci (Lond) 2020; 134:3-13. [PMID: 31898749 PMCID: PMC6944729 DOI: 10.1042/cs20190577] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2019] [Revised: 12/16/2019] [Accepted: 12/23/2019] [Indexed: 02/06/2023]
Abstract
Perivascular adipose tissue (PVAT) directly juxtaposes the vascular adventitia and contains a distinct mixture of mature adipocytes, preadipocytes, stem cells, and inflammatory cells that communicate via adipocytokines and other signaling mediators with the nearby vessel wall to regulate vascular function. Cross-talk between perivascular adipocytes and the cells in the blood vessel wall is vital for normal vascular function and becomes perturbed in diseases such as atherosclerosis. Perivascular adipocytes surrounding coronary arteries may be primed to promote inflammation and angiogenesis, and PVAT phenotypic changes occurring in the setting of obesity, hyperlipidemia etc., are fundamentally important in determining a pathogenic versus protective role of PVAT in vascular disease. Recent discoveries have advanced our understanding of the role of perivascular adipocytes in modulating vascular function. However, their impact on cardiovascular disease (CVD), particularly in humans, is yet to be fully elucidated. This review will highlight the complex mechanisms whereby PVAT regulates atherosclerosis, with an emphasis on clinical implications of PVAT and emerging strategies for evaluation and treatment of CVD based on PVAT biology.
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VanderLaan PA, Reardon CA, Cabana VG, Wang CR, Getz GS. Invariant Natural Killer T-Cells and Total CD1d Restricted Cells Differentially Influence Lipid Metabolism and Atherosclerosis in Low Density Receptor Deficient Mice. Int J Mol Sci 2019; 20:ijms20184566. [PMID: 31540125 PMCID: PMC6770011 DOI: 10.3390/ijms20184566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Revised: 09/05/2019] [Accepted: 09/11/2019] [Indexed: 11/16/2022] Open
Abstract
Natural killer T (NKT) cells are a distinct subset of lymphocytes that bridge the innate and adaptive immune response and can be divided into type I invariant NKT cells (iNKT) and type II NKT cells. The objective of this study is to examine the effects of NKT cell on lipid metabolism and the initiation and progression of atherosclerosis in LDL receptor deficient (LDLR−/−) mice. Mice were fed an atherogenic diet for 4 or 8 weeks and plasma lipids, lipoproteins, and atherosclerosis were measured. The selective absence of iNKT cells in Jα18−/−LDLR−/− mice led to an increase in plasma cholesterol levels in female mice. Transgenic Vα14tg/LDLR−/− mice with elevated numbers of iNKT cells had increased late atherosclerosis of the innominate artery, though absence of either iNKT cells or all NKT cells and other CD1d expressing cells had varying effects on atherosclerotic lesion burden in the ascending aortic arch and aortic root. These studies not only highlight the potential modulatory role played by NKT cells in atherosclerosis and lipid metabolism, but also raise the possibility that divergent roles may be played by iNKT and CD1d restricted cells such as type II NKT cells or other CD1d expressing cells.
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Affiliation(s)
- Paul A VanderLaan
- Department of Pathology, The University of Chicago, Chicago, IL 60637, USA.
| | | | | | - Chyung-Ru Wang
- Department of Microbiology and Immunology, Northwestern University, 633 Clark St, Evanston, IL 60208, USA.
| | - Godfrey S Getz
- Department of Pathology, The University of Chicago, Chicago, IL 60637, USA.
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Abstract
PURPOSE OF REVIEW Atherosclerosis is a chronic inflammatory disease in which subendothelial infiltration of lipoproteins leads to inflamed lesions in arteries. Despite improvements in secondary prevention, most cardiovascular events cannot be avoided with current therapies. This review focuses on novel mechanistic insights on lipid-driven immune activation, which could pave the way for new anti-inflammatory treatments for atherosclerosis. RECENT FINDINGS Immunometabolic interactions can shape the immune response. Within atherosclerotic plaques, macrophages and T cells are the dominant immune cell populations. Using multiple mechanisms, lipoprotein-derived components activate both the innate and adaptive immune systems. Cholesterol crystals and apolipoprotein B-peptides have been shown to activate macrophages and T cells, respectively. Lipoproteins are also important modulators of regulatory T cells that can hamper vascular inflammation. In the liver, T cells can influence hepatic inflammation and lipoprotein metabolism. Hence, there is an intricate crosstalk between the immune system and lipoprotein metabolism. SUMMARY Novel treatments are needed to prevent clinical manifestations of atherosclerosis. Improved understanding of lipid-driven immunometabolic responses is likely to reveal new therapeutic targets.
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Affiliation(s)
- Anton Gisterå
- Cardiovascular Medicine Unit, Department of Medicine, Center for Molecular Medicine, Karolinska Institutet, Karolinska University Hospital, Stockholm, Sweden
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Singh AK, Tripathi P, Cardell SL. Type II NKT Cells: An Elusive Population With Immunoregulatory Properties. Front Immunol 2018; 9:1969. [PMID: 30210505 PMCID: PMC6120993 DOI: 10.3389/fimmu.2018.01969] [Citation(s) in RCA: 62] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2018] [Accepted: 08/10/2018] [Indexed: 12/20/2022] Open
Abstract
Natural killer T (NKT) cells are unique unconventional T cells that are reactive to lipid antigens presented on the non-polymorphic major histocompatibility class (MHC) I-like molecule CD1d. They have characteristics of both innate and adaptive immune cells, and have potent immunoregulatory roles in tumor immunity, autoimmunity, and infectious diseases. Based on their T cell receptor (TCR) expression, NKT cells are divided into two subsets, type I NKT cells with an invariant TCRα-chain (Vα24 in humans, Vα14 in mice) and type II NKT cells with diverse TCRs. While type I NKT cells are well-studied, knowledge about type II NKT cells is still limited, and it is to date only possible to identify subsets of this population. However, recent advances have shown that both type I and type II NKT cells play important roles in many inflammatory situations, and can sometimes regulate the functions of each other. Type II NKT cells can be both protective and pathogenic. Here, we review current knowledge on type II NKT cells and their functions in different disease settings and how these cells can influence immunological outcomes.
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Affiliation(s)
- Avadhesh Kumar Singh
- Department of Microbiology and Immunology, Institute of Biomedicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Prabhanshu Tripathi
- Department of Microbiology and Immunology, Institute of Biomedicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Susanna L Cardell
- Department of Microbiology and Immunology, Institute of Biomedicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
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Ren Y, Sekine-Kondo E, Tateyama M, Kasetthat T, Wongratanacheewin S, Watarai H. New Genetically Manipulated Mice Provide Insights Into the Development and Physiological Functions of Invariant Natural Killer T Cells. Front Immunol 2018; 9:1294. [PMID: 29963043 PMCID: PMC6010523 DOI: 10.3389/fimmu.2018.01294] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Accepted: 05/24/2018] [Indexed: 12/24/2022] Open
Abstract
Invariant natural killer T (iNKT) cells are a unique T cell subset that exhibits characteristics of both innate immune cells and T cells. They express Vα14-Jα18 (Trav11-Traj18) as an invariant chain of the T cell receptor (TCR) and are restricted to the MHC class I-like monomorphic antigen presenting molecule CD1d. iNKT cells are known as immune regulators that bridge the innate and acquired immune systems by rapid and massive production of a wide range of cytokines, which could enable them to participate in immune responses during various disease states. Thus, Traj18-deficient mice, Cd1d-deficient mice, or iNKT cell-overexpressing mice such as iNKT TCRα transgenic mice and iNKT cell cloned mice which contain a Vα14-Jα18 rearrangement in the TCRα locus are useful experimental models for the analysis of iNKT cells in vivo and in vitro. In this review, we describe the pros and cons of the various available genetically manipulated mice and summarize the insights gained from their study, including the possible roles of iNKT cells in obesity and diabetes.
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Affiliation(s)
- Yue Ren
- Division of Stem Cell Cellomics, Center for Stem Cell Biology and Regenerative Medicine, Institute of Medical Science, University of Tokyo, Tokyo, Japan.,Department of Neurology, The Neurological Institute of Jiangxi Province, Jiangxi Provincial People's Hospital, Nanchang, China
| | - Etsuko Sekine-Kondo
- Division of Stem Cell Cellomics, Center for Stem Cell Biology and Regenerative Medicine, Institute of Medical Science, University of Tokyo, Tokyo, Japan
| | - Midori Tateyama
- Division of Stem Cell Cellomics, Center for Stem Cell Biology and Regenerative Medicine, Institute of Medical Science, University of Tokyo, Tokyo, Japan.,Department of Immunology, Kitasato University School of Medicine, Sagamihara, Japan
| | - Thitinan Kasetthat
- Division of Stem Cell Cellomics, Center for Stem Cell Biology and Regenerative Medicine, Institute of Medical Science, University of Tokyo, Tokyo, Japan.,Department of Microbiology, Khon Kaen University, Khon Kaen, Thailand
| | | | - Hiroshi Watarai
- Division of Stem Cell Cellomics, Center for Stem Cell Biology and Regenerative Medicine, Institute of Medical Science, University of Tokyo, Tokyo, Japan
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