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Strissel KJ, Denis GV, Nikolajczyk BS. Immune regulators of inflammation in obesity-associated type 2 diabetes and coronary artery disease. Curr Opin Endocrinol Diabetes Obes 2014; 21:330-8. [PMID: 25106001 PMCID: PMC4251956 DOI: 10.1097/med.0000000000000085] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
PURPOSE OF REVIEW To summarize current work identifying inflammatory components that underlie associations between obesity-associated type 2 diabetes and coronary artery disease. RECENT FINDINGS Recent studies implicate immune cells as drivers of pathogenic inflammation in human type 2 diabetes. Inflammatory lymphocytes characterize unhealthy adipose tissue, but regional adipose volume, primarily visceral and pericardial fat, also predict severity and risk for obesity-associated coronary artery disease. Having a greater understanding of shared characteristics between inflammatory cells from different adipose tissue depots and a more accessible tissue, such as blood, will facilitate progress toward clinical translation of our appreciation of obesity as an inflammatory disease. SUMMARY Obesity predisposes inflammation and metabolic dysfunction through multiple mechanisms, but these mechanisms remain understudied in humans. Studies of obese patients have identified disproportionate impacts of specific T cell subsets in metabolic diseases like type 2 diabetes. On the basis of demonstration that adipose tissue inflammation is depot-specific, analysis of adiposity by waist-to-hip ratio or MRI will increase interpretive value of lymphocyte-focused studies and aid clinicians in determining which obese individuals are at highest risk for coronary artery disease. New tools to combat obesity-associated coronary artery disease and other comorbidities will stem from identification of immune cell-mediated inflammatory networks that are amenable to pharmacological interventions.
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Affiliation(s)
- Katherine J. Strissel
- Department of Medicine, Boston University School of Medicine, Boston MA, USA
- Cancer Research Center, Boston University School of Medicine, Boston MA, USA
| | - Gerald V. Denis
- Department of Medicine, Boston University School of Medicine, Boston MA, USA
- Cancer Research Center, Boston University School of Medicine, Boston MA, USA
| | - Barbara S. Nikolajczyk
- Department of Medicine, Boston University School of Medicine, Boston MA, USA
- Department of Microbiology, Boston University School of Medicine, Boston MA, USA
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Zhang H, Liu Y, Bian Z, Huang S, Han X, You Z, Wang Q, Qiu D, Miao Q, Peng Y, Li X, Invernizzi P, Ma X. The critical role of myeloid-derived suppressor cells and FXR activation in immune-mediated liver injury. J Autoimmun 2014; 53:55-66. [DOI: 10.1016/j.jaut.2014.02.010] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2014] [Accepted: 02/23/2014] [Indexed: 10/24/2022]
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Hammerich L, Tacke F. Interleukins in chronic liver disease: lessons learned from experimental mouse models. Clin Exp Gastroenterol 2014; 7:297-306. [PMID: 25214799 PMCID: PMC4158890 DOI: 10.2147/ceg.s43737] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Interleukins represent a class of immunomodulatory cytokines, small intercellular signaling proteins, that are critically involved in the regulation of immune responses. They are produced in large amounts by various cell types during inflammatory reactions, and the balance of cytokines determines the outcome of an immune response. Therefore, cytokines are regarded as interesting therapeutic targets for the treatment of patients with liver diseases. Mouse models provide a good tool for in vivo studies on cytokine function, as human and mouse cytokines share many homologies. Sophisticated mouse models either mimicking distinct pathological conditions or targeting cytokines and cytokine-signaling pathways in the liver or even in distinct cellular compartments have provided enormous insight into the different functions of interleukins during hepatic inflammation. Interleukins may have pro- as well as anti-inflammatory functions in chronic liver diseases, some interleukins even both, dependent on the inflammatory stimulus, the producing and the responding cell type. IL-17, for example, promotes hepatic fibrogenesis through activation of hepatic stellate cells and facilitates development of liver cancer through recruitment of myeloid-derived suppressor cells. IL-22, on the other hand, protects from development of fibrosis or steatohepatitis. IL-12 balances T-helper (Th)-1 and Th2 cell responses in infectious disease models. IL-13 and IL-33, two cytokines related to Th2 cells and innate lymphoid cells, promote fibrotic responses in the liver. IL-10 is the prototypic anti-inflammatory interleukin with tissue-protective functions during chronic liver injury and fibrogenesis. Despite its critical role for inducing the acute-phase response in the liver, IL-6 signaling is protective during fibrosis progression, but promotes hepatocellular carcinoma. Experimental studies in mice help to define the exact influence of a specific cytokine on the outcome of chronic liver diseases and to identify useful therapeutic targets.
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Affiliation(s)
- Linda Hammerich
- Department of Medicine III, University Hospital Aachen, Aachen, Germany
| | - Frank Tacke
- Department of Medicine III, University Hospital Aachen, Aachen, Germany
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204
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Firneisz G. Non-alcoholic fatty liver disease and type 2 diabetes mellitus: The liver disease of our age? World J Gastroenterol 2014; 20:9072-9089. [PMID: 25083080 PMCID: PMC4112878 DOI: 10.3748/wjg.v20.i27.9072] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/13/2013] [Revised: 01/10/2014] [Accepted: 05/14/2014] [Indexed: 02/07/2023] Open
Abstract
Non-alcoholic fatty liver disease (NAFLD) is a chronic liver disease that might affect up to one-third of the adult population in industrialised countries. NAFLD incorporates histologically and clinically different non-alcoholic entities; fatty liver (NAFL, steatosis hepatis) and steatohepatitis (NASH-characterised by hepatocyte ballooning and lobular inflammation ± fibrosis) might progress to cirrhosis and rarely to hepatocellular cancer. NAFL increasingly affects children (paediatric prevalence is 4.2%-9.6%). Type 2 diabetes mellitus (T2DM), insulin resistance (IR), obesity, metabolic syndrome and NAFLD are particularly closely related. Increased hepatic lipid storage is an early abnormality in insulin resistant women with a history of gestational diabetes mellitus. The accumulation of triacylglycerols in hepatocytes is predominantly derived from the plasma nonesterified fatty acid pool supplied largely by the adipose tissue. A few NAFLD susceptibility gene variants are associated with progressive liver disease, IR, T2DM and a higher risk for hepatocellular carcinoma. Although not approved, pharmacological approaches might be considered in NASH patients.
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205
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Wang X, Jiang Z, Xing M, Fu J, Su Y, Sun L, Zhang L. Interleukin-17 mediates triptolide-induced liver injury in mice. Food Chem Toxicol 2014; 71:33-41. [PMID: 24949944 DOI: 10.1016/j.fct.2014.06.004] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2014] [Revised: 06/05/2014] [Accepted: 06/06/2014] [Indexed: 01/30/2023]
Abstract
Triptolide (TP)-induced liver injury can be attributed to the Th17/Treg imbalance with the enhancement of the expansion of Th17 cells and suppression of the production of Tregs, especially the significant increase of interleukin (IL)-17 secreted by helper T (Th) 17 cells. To further investigate the involvement of IL-17-mediated immune response in the TP-induced hepatotoxicity, we examined the plasma transaminase, histopathological changes, hepatic frequencies of Th17 cells, hepatic expression of transcriptional factors and cytokines genes and plasma IL-17 levels after administration of TP (600 μg/kg) by oral gavage to female C57BL/6 mice. Mice treated with TP displayed acute liver injury with significantly increased hepatic frequencies of Th17 cells, mRNA expression of retinoid-related orphan receptor (ROR)-γt and plasma IL-17 level as well as the plasma ALT and AST. Neutralization study using anti-IL-17 antibody ameliorated TP-induced liver injury. In contrast, when challenged by coadministration of recombinant IL-17, hepatotoxicity was exacerbated in the triptolide-administered mice. In summary, this report was demonstrated for the first time that IL-17-mediated immune response is involved in the pathogenesis of TP-induced liver injury in mice, which may shed light on the mechanisms of TP-induced liver injury.
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Affiliation(s)
- Xinzhi Wang
- Jiangsu Center for Drug Screening, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009, PR China
| | - Zhenzhou Jiang
- Jiangsu Center for Drug Screening, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009, PR China; Key Laboratory of Drug Quality Control and Pharmacovigilance (China Pharmaceutical University), Ministry of Education, 24 Tong Jia Xiang, Nanjing 210009, PR China.
| | - Mengtao Xing
- Department of Pathology, University of Illinois at Chicago, 909 S. Wolcott St., Chicago, IL 60612, United States
| | - Jing Fu
- Jiangsu Center for Drug Screening, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009, PR China
| | - Yuwen Su
- Jiangsu Center for Drug Screening, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009, PR China; School of Pharmacy, Nanjing Medical University, 140 Hanzhong Road, Nanjing 210029, PR China
| | - Lixin Sun
- Jiangsu Center for Drug Screening, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009, PR China
| | - Luyong Zhang
- Jiangsu Center for Drug Screening, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009, PR China; Jiangsu Provincial Center for Pharmacodynamics Research and Evaluation, China Pharmaceutical University, Nanjing 210009, PR China.
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206
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Peverill W, Powell LW, Skoien R. Evolving concepts in the pathogenesis of NASH: beyond steatosis and inflammation. Int J Mol Sci 2014; 15:8591-638. [PMID: 24830559 PMCID: PMC4057750 DOI: 10.3390/ijms15058591] [Citation(s) in RCA: 260] [Impact Index Per Article: 26.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2014] [Revised: 03/20/2014] [Accepted: 04/17/2014] [Indexed: 12/12/2022] Open
Abstract
Non-alcoholic steatohepatitis (NASH) is characterised by hepatic steatosis and inflammation and, in some patients, progressive fibrosis leading to cirrhosis. An understanding of the pathogenesis of NASH is still evolving but current evidence suggests multiple metabolic factors critically disrupt homeostasis and induce an inflammatory cascade and ensuing fibrosis. The mechanisms underlying these changes and the complex inter-cellular interactions that mediate fibrogenesis are yet to be fully elucidated. Lipotoxicity, in the setting of excess free fatty acids, obesity, and insulin resistance, appears to be the central driver of cellular injury via oxidative stress. Hepatocyte apoptosis and/or senescence contribute to activation of the inflammasome via a variety of intra- and inter-cellular signalling mechanisms leading to fibrosis. Current evidence suggests that periportal components, including the ductular reaction and expansion of the hepatic progenitor cell compartment, may be involved and that the Th17 response may mediate disease progression. This review aims to provide an overview of the pathogenesis of NASH and summarises the evidence pertaining to key mechanisms implicated in the transition from steatosis and inflammation to fibrosis. Currently there are limited treatments for NASH although an increasing understanding of its pathogenesis will likely improve the development and use of interventions in the future.
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Affiliation(s)
- William Peverill
- Department of Gastroenterology and Hepatology, Royal Brisbane and Women's Hospital, Brisbane 4029, Australia.
| | - Lawrie W Powell
- Department of Gastroenterology and Hepatology, Royal Brisbane and Women's Hospital, Brisbane 4029, Australia.
| | - Richard Skoien
- Department of Gastroenterology and Hepatology, Royal Brisbane and Women's Hospital, Brisbane 4029, Australia.
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207
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Liang J, Zhang B, Shen RW, Liu JB, Gao MH, Geng X, Li Y, Li YY, Zhang W. The effect of antifibrotic drug halofugine on Th17 cells in concanavalin A-induced liver fibrosis. Scand J Immunol 2014; 79:163-72. [PMID: 24383550 DOI: 10.1111/sji.12144] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2013] [Accepted: 11/25/2013] [Indexed: 12/14/2022]
Abstract
Anti-inflammation strategy is one of the proposed therapeutic approaches to hepatic fibrosis. T helper (Th) 17 cells, which play a detrimental role in experimental murine models of inflammatory diseases, have been demonstrated to participate in the pathogenesis of liver damage. The inhibitory effect of halofuginone (HF), an active component of extracts derived from the plant alkaloid febrifugine, on collagen synthesis has been shown in animal models of the fibrotic disease. The aim of this study was to clarify the in vivo effect of HF on Th17 cells in concanavalin A-induced fibrosis rats. Haematoxylin-eosin (HE) staining and Masson staining were performed to observe collagen deposition. The presence of INF-gamma, TNF-alpha, IL-6, IL-17, IL-1beta, IL-33 and IL-10 in serum and the presence of ROR-γt, IL-17, TGF-β1 and α-SMA in liver tissue were detected. Flow cytometry was performed to analyse the percentage of Th17 cells. We observed significantly lower levels of INF-gamma, TNF-alpha, IL-6, IL-17, IL-1beta, TGF-β1 and α-SMA in HF-treated group of rats, and the percentage of Th17 cells in splenic lymphocyte was decreased well. Histological examination demonstrated that HF significantly reduced the severity of liver fibrosis in HF-treated rats. We concluded that HF (10 mg/kg) exerts an antifibrotic impact on Th17 cells and its relative cytokines in rats with ConA-induced fibrosis.
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Affiliation(s)
- J Liang
- Department of Immunology, Medical College of Qingdao University, QingDao, China
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208
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Huang XL, Guo XY, Jiang HX, Qin SY, Luo W, Ma SJ, Lu DH, Chen M, Wang JX, Yang XW. Expression of Th17 and Th1 cells in a murine model of carbon tetrachloride-induced liver fibrosis. Shijie Huaren Xiaohua Zazhi 2014; 22:1826-1833. [DOI: 10.11569/wcjd.v22.i13.1826] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To investigate the expression of T helper cells 17 (Th17) and type I helper T cells (Th1) as well as their cytokines interleukin-17 (IL-17) and interferon-γ (IFN-γ) in a murine model of carbon tetrachloride (CCl4)-induced liver fibrosis.
METHODS: Fifty male Balb/c mice were randomly divided into five groups, including a normal control group (n), two liver fibrosis groups (F4 and F8; induced for 4 and 8 weeks, respectively) and two control groups (C4 and C8), with 10 mice in each group. Liver fibrosis was induced by intraperitoneal injection of CCl4. HE staining and Masson's staining were used to detect hepatic pathological changes. The expression of α-smooth muscle actin (α-SMA) in the liver of mice was determined by immunohistochemical staining. The proportions of CD4+IL-17+ T (Th17) cells and CD4+IFN-γ+ T (Th1) cells in the murine spleen were detected by flow cytometric analysis. Enzyme linked immunosorbent assay (ELISA) was used to measure the levels of IL-17 and IFN-γ in murine peripheral blood. The correlation analyses between all the above parameters were conducted.
RESULTS: HE staining and Masson's staining showed that hepatic fibrosis was successfully induced by CCl4 injection. After CCl4 administration, increased expression of α-SMA was detected in the hepatic fibrosis groups. The α-SMA spread to the portal, portal area and fibrous septa. Continuous CCl4 injection led to enlarged fibrosis area in the hepatic fibrosis groups. The percentages of Th17 and Th1 cells in the spleen in the F4 and F8 groups were significantly increased as compared with those in the N, C4 and C8 groups, particularly in F8 (P < 0.05 for all). The levels of IL-17 and IFN-γ in the F4 and F8 groups were significantly increased as compared with those in the N, C4 and C8 groups (P < 0.05 for all). Th17 cells and Th1 cells in the spleen in the hepatic fibrosis groups had a positive correlation with α-SMA expression (P < 0.01 for all). Th17 cells had a positive correlation with Th1 cells and the levels of IL-17 (P < 0.01 for both).
CONCLUSION: Th17 and Th1 cells in the spleen as well as the levels of IL-17 and IFN-γ in peripheral blood are significantly increased in the murine model of CCl40-induced liver fibrosis. Th17 cells may be involved in the pathogenesis of liver fibrosis through producing IL-17.
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209
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Harley ITW, Stankiewicz TE, Giles DA, Softic S, Flick LM, Cappelletti M, Sheridan R, Xanthakos SA, Steinbrecher KA, Sartor RB, Kohli R, Karp CL, Divanovic S. IL-17 signaling accelerates the progression of nonalcoholic fatty liver disease in mice. Hepatology 2014; 59:1830-9. [PMID: 24115079 PMCID: PMC3975735 DOI: 10.1002/hep.26746] [Citation(s) in RCA: 186] [Impact Index Per Article: 18.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/14/2013] [Accepted: 09/02/2013] [Indexed: 12/11/2022]
Abstract
UNLABELLED Inflammation plays a central pathogenic role in the pernicious metabolic and end-organ sequelae of obesity. Among these sequelae, nonalcoholic fatty liver disease (NAFLD) has become the most common chronic liver disease in the developed world. The twinned observations that obesity is associated with increased activation of the interleukin (IL)-17 axis and that this axis can regulate liver damage in diverse contexts prompted us to address the role of IL-17RA signaling in the progression of NAFLD. We further examined whether microbe-driven IL-17A regulated NAFLD development and progression. We show here that IL-17RA(-/-) mice respond to high-fat diet stress with significantly greater weight gain, visceral adiposity, and hepatic steatosis than wild-type controls. However, obesity-driven lipid accumulation was uncoupled from its end-organ consequences in IL-17RA(-/-) mice, which exhibited decreased steatohepatitis, nicotinamide adenine dinucleotide phosphate (NADPH)-oxidase enzyme expression, and hepatocellular damage. Neutralization of IL-17A significantly reduced obesity-driven hepatocellular damage in wild-type mice. Further, colonization of mice with segmented filamentous bacteria (SFB), a commensal that induces IL-17A production, exacerbated obesity-induced hepatocellular damage. In contrast, SFB depletion protected from obesity-induced hepatocellular damage. CONCLUSION These data indicate that obesity-driven activation of the IL-17 axis is central to the development and progression of NAFLD to steatohepatitis and identify the IL-17 pathway as a novel therapeutic target in this condition.
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Affiliation(s)
- Isaac TW Harley
- Division of Cellular and Molecular Immunology, Cincinnati Children's Hospital Research Foundation, and the University of Cincinnati College of MedicineCincinnati, OH
| | - Traci E Stankiewicz
- Division of Cellular and Molecular Immunology, Cincinnati Children's Hospital Research Foundation, and the University of Cincinnati College of MedicineCincinnati, OH
| | - Daniel A Giles
- Division of Cellular and Molecular Immunology, Cincinnati Children's Hospital Research Foundation, and the University of Cincinnati College of MedicineCincinnati, OH
| | - Samir Softic
- Division of Gastroenterology, Hepatology and Clinical Nutrition, Cincinnati Children's Hospital Research Foundation, and the University of Cincinnati College of MedicineCincinnati, OH
| | - Leah M Flick
- Division of Cellular and Molecular Immunology, Cincinnati Children's Hospital Research Foundation, and the University of Cincinnati College of MedicineCincinnati, OH
| | - Monica Cappelletti
- Division of Cellular and Molecular Immunology, Cincinnati Children's Hospital Research Foundation, and the University of Cincinnati College of MedicineCincinnati, OH
| | - Rachel Sheridan
- Division of Pathology and Laboratory Medicine, Cincinnati Children's Hospital Research Foundation, and the University of Cincinnati College of MedicineCincinnati, OH
| | - Stavra A Xanthakos
- Division of Gastroenterology, Hepatology and Clinical Nutrition, Cincinnati Children's Hospital Research Foundation, and the University of Cincinnati College of MedicineCincinnati, OH
| | - Kris A Steinbrecher
- Division of Gastroenterology, Hepatology and Clinical Nutrition, Cincinnati Children's Hospital Research Foundation, and the University of Cincinnati College of MedicineCincinnati, OH
| | - R Balfour Sartor
- Departments of Medicine, Microbiology and Immunology, Division of Gastroenterology & Hepatology, University of North CarolinaChapel Hill, NC
| | - Rohit Kohli
- Division of Gastroenterology, Hepatology and Clinical Nutrition, Cincinnati Children's Hospital Research Foundation, and the University of Cincinnati College of MedicineCincinnati, OH
| | - Christopher L Karp
- Division of Cellular and Molecular Immunology, Cincinnati Children's Hospital Research Foundation, and the University of Cincinnati College of MedicineCincinnati, OH
| | - Senad Divanovic
- Division of Cellular and Molecular Immunology, Cincinnati Children's Hospital Research Foundation, and the University of Cincinnati College of MedicineCincinnati, OH
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210
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Gadd VL, Skoien R, Powell EE, Fagan KJ, Winterford C, Horsfall L, Irvine K, Clouston AD. The portal inflammatory infiltrate and ductular reaction in human nonalcoholic fatty liver disease. Hepatology 2014; 59:1393-405. [PMID: 24254368 DOI: 10.1002/hep.26937] [Citation(s) in RCA: 305] [Impact Index Per Article: 30.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/09/2013] [Accepted: 11/15/2013] [Indexed: 12/11/2022]
Abstract
UNLABELLED Although nonalcoholic fatty liver disease (NAFLD) is conventionally assessed histologically for lobular features of inflammation, development of portal fibrosis appears to be associated with disease progression. We investigated the composition of the portal inflammatory infiltrate and its relationship to the ductular reaction (DR), a second portal phenomenon implicated in fibrogenesis. The portal inflammatory infiltrate may contribute directly to fibrogenesis as well as influence the fate of the DR hepatic progenitor cells (HPCs), regulating the balance between liver repair and fibrosis. The presence of portal inflammation in NAFLD was strongly correlated with disease severity (fibrosis stage) and the DR. The portal infiltrate was characterized by immunostaining NAFLD liver biopsy sections (n = 33) for broad leukocyte subset markers (CD68, CD3, CD8, CD4, CD20, and neutrophil elastase) and selected inflammatory markers (matrix metalloproteinase 9 and interleukin [IL]-17). Cells expressing all markers examined were identified throughout the liver lobules and in portal tracts, although portal tracts were more densely populated (P < 0.01), and dominated by CD68(+) macrophages and CD8(+) lymphocytes, at all stages of disease. An increase in portal macrophages in NAFLD patients with steatosis alone (P < 0.01) was the earliest change detected, even before elevated expression of the proinflammatory cytokines, IL1B and TNF, in patients with early NASH (P < 0.05). Portal and periductal accumulation of all other cell types examined occurred in progressed NASH (all P < 0.05). CONCLUSION Knowledge of the complex cellular composition of the portal inflammatory infiltrate and HPC/DR niche in NAFLD will shape future functional studies to elucidate the contribution of portal inflammation to HPC differentiation and NAFLD pathogenesis.
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Affiliation(s)
- Victoria L Gadd
- Center for Liver Disease Research, School of Medicine, The University of Queensland, Translational Research Institute, Brisbane, Australia
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211
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The Effects of Needling Fenglong (ST40) and Neiguan (PC6) on IL-17 of ApoE-Gene-Knockout Mice's Liver. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2014; 2014:691863. [PMID: 24778705 PMCID: PMC3979069 DOI: 10.1155/2014/691863] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/27/2013] [Accepted: 02/19/2014] [Indexed: 01/03/2023]
Abstract
The aim of the present paper was to observe the effects of needling ST40 and PC6 on IL-17 of ApoE−/− mice with fatty liver. Forty male ApoE−/− mice were randomized into Needling-Acupoint Group, Simvastatin Intragastric Administration Group, Needling Nonacupoint Group, and Model Group. Each was fed with high fat diet for 8 weeks since 16 weeks of age; after 8 weeks of intervention, mice were sacrificed and tested for various examinations. Result showed that the body weight, TC, and serum IL-17 in Needling-Acupoint Group decreased. Compared with Model Group, the immunohistochemical expressions of IL-17 in liver tissue were significantly decreased among the other three groups. In conclusion, acupuncture was able to lower the expression of IL-17 level both in serum and liver tissue in ApoE−/− mice, which is helpful to reduce the inflammation and defers the progress from fatty liver to cirrhosis.
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212
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Marra F, Lotersztajn S. Pathophysiology of NASH: perspectives for a targeted treatment. Curr Pharm Des 2014; 19:5250-69. [PMID: 23394092 DOI: 10.2174/13816128113199990344] [Citation(s) in RCA: 116] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2012] [Accepted: 01/01/2013] [Indexed: 02/07/2023]
Abstract
Non alcoholic steatohepatitis (NASH) is the more severe form of nonalcoholic fatty liver disease. In NASH, fatty liver, hepatic inflammation, hepatocyte injury and fibrogenesis are associated, and this condition may eventually lead to cirrhosis. Current treatment of NASH relies on the reduction of body weight and increase in physical activity, but there is no pharmacologic treatment approved as yet. Emerging data indicate that NASH progression results from parallel events originating from the liver as well as from the adipose tissue, the gut and the gastrointestinal tract. Thus, dysfunction of the adipose tissue through enhanced flow of free fatty acids and release of adipocytokines, and alterations in the gut microbiome generate proinflammatory signals that underlie NASH progression. Additional 'extrahepatic hits' include dietary factors and gastrointestinal hormones. Within the liver, hepatocyte apoptosis, ER stress and oxidative stress are key contributors to hepatocellular injury. In addition, lipotoxic mediators and danger signals activate Kupffer cells which initiate and perpetuate the inflammatory response by releasing inflammatory mediators that contribute to inflammatory cell recruitment and development of fibrosis. Inflammatory and fibrogenic mediators include chemokines, the cannabinoid system, the inflammasome and activation of pattern-recognition receptors. Here we review the major mechanisms leading to appearance and progression of NASH, focusing on both extrahepatic signals and local inflammatory mechanisms, in an effort to identify the most promising molecular targets for the treatment of this condition.
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Affiliation(s)
- Fabio Marra
- Dipartimento di Medicina Sperimentale e Clinica, University of Florence, Italy.
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213
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Marra F, Lotersztajn S. Pathophysiology of NASH: perspectives for a targeted treatment. Curr Pharm Des 2014. [PMID: 23394092 DOI: 10.2174/1381612811399990344] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Non alcoholic steatohepatitis (NASH) is the more severe form of nonalcoholic fatty liver disease. In NASH, fatty liver, hepatic inflammation, hepatocyte injury and fibrogenesis are associated, and this condition may eventually lead to cirrhosis. Current treatment of NASH relies on the reduction of body weight and increase in physical activity, but there is no pharmacologic treatment approved as yet. Emerging data indicate that NASH progression results from parallel events originating from the liver as well as from the adipose tissue, the gut and the gastrointestinal tract. Thus, dysfunction of the adipose tissue through enhanced flow of free fatty acids and release of adipocytokines, and alterations in the gut microbiome generate proinflammatory signals that underlie NASH progression. Additional 'extrahepatic hits' include dietary factors and gastrointestinal hormones. Within the liver, hepatocyte apoptosis, ER stress and oxidative stress are key contributors to hepatocellular injury. In addition, lipotoxic mediators and danger signals activate Kupffer cells which initiate and perpetuate the inflammatory response by releasing inflammatory mediators that contribute to inflammatory cell recruitment and development of fibrosis. Inflammatory and fibrogenic mediators include chemokines, the cannabinoid system, the inflammasome and activation of pattern-recognition receptors. Here we review the major mechanisms leading to appearance and progression of NASH, focusing on both extrahepatic signals and local inflammatory mechanisms, in an effort to identify the most promising molecular targets for the treatment of this condition.
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Affiliation(s)
- Fabio Marra
- Dipartimento di Medicina Sperimentale e Clinica, University of Florence, Italy.
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214
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Wang X, Jiang Z, Cao W, Yuan Z, Sun L, Zhang L. Th17/Treg imbalance in triptolide-induced liver injury. Fitoterapia 2014; 93:245-51. [PMID: 24444892 DOI: 10.1016/j.fitote.2014.01.006] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2013] [Revised: 01/01/2014] [Accepted: 01/09/2014] [Indexed: 02/07/2023]
Abstract
The study was designed to investigate the immune-modulatory effects of triptolide (TP) on CD4(+) T cell responses during liver injury. Previous studies have suggested that TP plays a critical role in modulating both innate and adaptive immune reactions, but its effects on the Th17/Treg balance during TP-induced liver injury remain unknown. In this study, female C57BL/6 mice were administered by oral gavage with TP at a dose of 250 or 500 μg/kg per mouse. We examined the plasma biochemical parameters, histopathological changes, hepatic frequencies of Th17 cells and Treg cells, hepatic expression of transcriptional factors and cytokine genes and hepatic interleukin (IL)-17 and IL-10 levels in TP-administered mice. Mice treated with TP displayed liver injury with markedly increased plasma transaminase as well as hepatic mRNA expression of retinoid related orphan receptor (ROR)-γt and hepatic IL-17 level at 24h. However, hepatic frequencies of Tregs and hepatic expression of forkhead/winged-helix family transcriptional repressor p3 (FoxP3) decreased at 24h after TP administration. Furthermore, we found that elevated serum biochemical parameters positively correlated with the Th17/Treg ratios. Taken together, these results revealed a novel and interesting phenomenon of TP in the enhancement of the expansion of Th17 cells and suppression of the production of Tregs during liver injury, which may represent a new pathogenesis of TP-induced liver injury.
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Affiliation(s)
- Xinzhi Wang
- Jiangsu Center for Drug Screening, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009, PR China
| | - Zhenzhou Jiang
- Jiangsu Center for Drug Screening, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009, PR China; Key Laboratory of Drug Quality Control and Pharmacovigilance (China Pharmaceutical University), Ministry of Education, 24 Tong Jia Xiang, Nanjing 210009, PR China
| | - Weiping Cao
- The Center Laboratory of Medicine, Maternity and Child Health Hospital, Zhenjiang 212001, PR China
| | - Ziqiao Yuan
- Jiangsu Center for Drug Screening, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009, PR China
| | - LiXin Sun
- Jiangsu Center for Drug Screening, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009, PR China
| | - Luyong Zhang
- Jiangsu Center for Drug Screening, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009, PR China; Jiangsu Provincial Center for Pharmacodynamics Research and Evaluation, China Pharmaceutical University, Nanjing 210009, PR China.
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Bhattacharjee J, Kumar JM, Arindkar S, Das B, Pramod U, Juyal RC, Majumdar SS, Nagarajan P. Role of immunodeficient animal models in the development of fructose induced NAFLD. J Nutr Biochem 2013; 25:219-26. [PMID: 24445047 DOI: 10.1016/j.jnutbio.2013.10.010] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2013] [Revised: 10/11/2013] [Accepted: 10/18/2013] [Indexed: 12/30/2022]
Abstract
Cellular and humoral immunity had been implicated in the pathogenesis of non-alcoholic fatty liver disease (NAFLD). This study was designed to assess if T, B and natural killer (NK) cells are involved in the progress of NAFLD in mouse models after chronic fructose treatment. Mouse models that are deficient in either T cells, B cells or NK cells or lacking both T and B cells were fed with 30% fructose solution for 12 weeks. Typical features of NAFLD, including the relative body weight, food and water intake, biochemical analytes, liver histology, NAFLD activity score, and glucose tolerance and insulin tolerance test were characterized. Further, the percentage of CD3, B220 and NK cells in peripheral-blood mononuclear cell, terminal deoxynucleotidyl transferase dUTP nick end labeling assay, immunodetection for hepatic apoptosis (p53) and for inflammation (TNFα) and quantitative real-time polymerase chain reaction for putative and inflammatory genes involved were determined. Our results conclude that mice deficient in T cells or NK cells fail to develop fructose induced NAFLD whereas the immunocompetent mice and mice with B-cell-specific defect developed NAFLD. Taken together, these data support that the onset of fructose-induced NAFLD is associated with involvement of T cells and NK cells in mice.
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Affiliation(s)
- Jashdeep Bhattacharjee
- Experimental Animal Facility, National Institute of Immunology, New Delhi - 100 067, India
| | | | - Shailendra Arindkar
- Experimental Animal Facility, National Institute of Immunology, New Delhi - 100 067, India
| | - Barun Das
- Experimental Animal Facility, National Institute of Immunology, New Delhi - 100 067, India
| | - Upadhyay Pramod
- Experimental Animal Facility, National Institute of Immunology, New Delhi - 100 067, India
| | - Ramesh C Juyal
- Experimental Animal Facility, National Institute of Immunology, New Delhi - 100 067, India
| | - Subeer S Majumdar
- Experimental Animal Facility, National Institute of Immunology, New Delhi - 100 067, India
| | - Perumal Nagarajan
- Experimental Animal Facility, National Institute of Immunology, New Delhi - 100 067, India.
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216
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Vonghia L, Michielsen P, Francque S. Immunological mechanisms in the pathophysiology of non-alcoholic steatohepatitis. Int J Mol Sci 2013; 14:19867-90. [PMID: 24084730 PMCID: PMC3821591 DOI: 10.3390/ijms141019867] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2013] [Revised: 09/11/2013] [Accepted: 09/22/2013] [Indexed: 02/06/2023] Open
Abstract
Non-alcoholic steatohepatitis (NASH) is characterized by the presence of steatosis, inflammation and hepatocyte injury and constitutes hepatic manifestation of the metabolic syndrome. The pathogenesis of NASH is complex and implicates cross-talk between different metabolically active sites, such as liver and adipose tissue. Obesity is considered a chronic low-grade inflammatory state and the liver has been recognized as being an "immunological organ". The complex role of the immune system in the pathogenesis of NASH is currently raising great interest, also in view of the possible therapeutic potential of immunotherapy in NASH. This review focuses on the disturbances of the cells constituting the innate and adaptive immune system in the liver and in adipose tissue.
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Affiliation(s)
- Luisa Vonghia
- Department of Gastroenterology and Hepatology, University Hospital Antwerp, Wilrijkstraat 10, Edegem 2650, Belgium; E-Mails: (P.M.); (S.F.)
- Department of Basic Medical Sciences, Neuroscience and Sensory Organs, University of Bari, Policlinico, Piazza Giulio Cesare, Bari 70100, Italy
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +32-3821-3323; Fax: +32-3821-4478
| | - Peter Michielsen
- Department of Gastroenterology and Hepatology, University Hospital Antwerp, Wilrijkstraat 10, Edegem 2650, Belgium; E-Mails: (P.M.); (S.F.)
| | - Sven Francque
- Department of Gastroenterology and Hepatology, University Hospital Antwerp, Wilrijkstraat 10, Edegem 2650, Belgium; E-Mails: (P.M.); (S.F.)
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217
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Stravitz RT, Sanyal AJ, Reisch J, Bajaj JS, Mirshahi F, Cheng J, Lee WM. Effects of N-acetylcysteine on cytokines in non-acetaminophen acute liver failure: potential mechanism of improvement in transplant-free survival. Liver Int 2013; 33:1324-31. [PMID: 23782487 PMCID: PMC4994536 DOI: 10.1111/liv.12214] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/23/2013] [Accepted: 05/05/2013] [Indexed: 12/12/2022]
Abstract
BACKGROUND N-Acetylcysteine (NAC) improves transplant-free survival in patients with non-acetaminophen acute liver failure (ALF) when administered in early stages of hepatic encephalopathy. The mechanisms of this benefit are unknown. AIM To determine whether NAC improves transplant-free survival in ALF by ameliorating the surge of pro-inflammatory cytokines. METHODS Serum samples were obtained from 78 participants of the randomized, ALF Study Group NAC Trial with grade 1 or 2 hepatic encephalopathy on randomization. Concentrations of ten cytokines, chosen to represent a wide array of inflammatory responses, were determined by multiplex enzyme-linked immunosorbent assay ELISA. RESULTS In univariate analysis, predictors of transplant-free survival included NAC administration (P = 0.012), admission bilirubin (P = 0.003), international normalized ratio INR (P = 0.0002), grade 1 vs. grade 2 encephalopathy (P = 0.006) and lower admission interleukin (IL)-17 concentrations (P = 0.011). IL-17 levels were higher in patients with grade 2 vs. grade 1 encephalopathy on randomization (P = 0.007) and in those who progressed to grade 3 or grade 4 encephalopathy over the following 7 days (P ≤ 0.01). Stepwise multivariate logistic regression analysis identified only NAC administration and lower IL-17 concentrations as independent predictors of transplant-free survival. In patients with detectable IL-17 concentrations on admission, 78% of those who received NAC vs. 44% of those who received placebo had undetectable levels by day 3-5 (P = 0.042), and the mean decrease in IL-17 concentrations between admission and late samples was significantly greater in patients who received NAC vs. placebo (P = 0.045). CONCLUSIONS N-acetylcysteine (NAC) may improve transplant-free survival in patients with non-acetaminophen ALF by ameliorating the production of IL-17, which is associated with progression of hepatic encephalopathy and poor outcome.
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Affiliation(s)
- R Todd Stravitz
- Section of Hepatology, Division of Gastroenterology, Hepatology and Nutrition and the Hume-Lee Transplant Center, Virginia Commonwealth University, Richmond, VA, USA
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218
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Scalera A, Di Minno MND, Tarantino G. What does irritable bowel syndrome share with non-alcoholic fatty liver disease? World J Gastroenterol 2013; 19:5402-5420. [PMID: 24023483 PMCID: PMC3761093 DOI: 10.3748/wjg.v19.i33.5402] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/25/2013] [Accepted: 07/25/2013] [Indexed: 02/06/2023] Open
Abstract
Non-alcoholic fatty liver disease (NAFLD) and irritable bowel syndrome (IBS) are two very common diseases in the general population. To date, there are no studies that highlight a direct link between NAFLD and IBS, but some recent reports have found an interesting correlation between obesity and IBS. A systematic PubMed database search was conducted highlighting that common mechanisms are involved in many of the local and systemic manifestations of NAFLD, leading to an increased cardiovascular risk, and IBS, leading to microbial dysbiosis, impaired intestinal barrier and altered intestinal motility. It is not known when considering local and systemic inflammation/immune system activation, which one has greater importance in NAFLD and IBS pathogenesis. Also, the nervous system is implicated. In fact, inflammation participates in the development of mood disorders, such as anxiety and depression, characteristics of obesity and consequently of NAFLD and, on the other hand, in intestinal hypersensitivity and dysmotility.
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219
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Xu R, Tao A, Zhang S, Zhang M. Neutralization of interleukin-17 attenuates high fat diet-induced non-alcoholic fatty liver disease in mice. Acta Biochim Biophys Sin (Shanghai) 2013; 45:726-33. [PMID: 23786840 DOI: 10.1093/abbs/gmt065] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Non-alcoholic fatty liver disease (NAFLD) is hepatic manifestation of a metabolic syndrome and includes a spectrum of hepatic steatosis, steatohepatitis, and fibrosis. Interleukin-17 (IL-17) has been reported to play a critical role in inflammatory progression of some liver diseases. The present study was designed to investigate the role of IL-17 on high fat diet-induced NAFLD in C57BL/6 mice. IL-17 blockade with anti-IL-17mAb significantly improved liver function, attenuated hepatic lipid accumulation, suppressed Kuffer cells activation, and decreased pro-inflammatory cytokines levels, which were associated with inhibition of NF-κB signaling cascades activation. Our data suggested that IL-17 was related to disease progression in NAFLD mouse model and blocking IL-17 may be a promising novel therapeutic approach for patients with NAFLD.
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Affiliation(s)
- Renfan Xu
- Department of Endocrinology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
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220
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Seki A, Sakai Y, Komura T, Nasti A, Yoshida K, Higashimoto M, Honda M, Usui S, Takamura M, Takamura T, Ochiya T, Furuichi K, Wada T, Kaneko S. Adipose tissue-derived stem cells as a regenerative therapy for a mouse steatohepatitis-induced cirrhosis model. Hepatology 2013; 58:1133-42. [PMID: 23686813 DOI: 10.1002/hep.26470] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/27/2012] [Accepted: 04/15/2013] [Indexed: 12/17/2022]
Abstract
UNLABELLED Cirrhosis is a chronic liver disease that impairs hepatic function and causes advanced fibrosis. Mesenchymal stem cells have gained recent popularity as a regenerative therapy since they possess immunomodulatory functions. We found that injected adipose tissue-derived stem cells (ADSCs) reside in the liver. Injection of ADSCs also restores albumin expression in hepatic parenchymal cells and ameliorates fibrosis in a nonalcoholic steatohepatitis model of cirrhosis in mice. Gene expression analysis of the liver identifies up- and down-regulation of genes, indicating regeneration/repair and anti-inflammatory processes following ADSC injection. ADSC treatment also decreases the number of intrahepatic infiltrating CD11b(+) and Gr-1(+) cells and reduces the ratio of CD8(+) /CD4(+) cells in hepatic inflammatory cells. This is consistent with down-regulation of genes in hepatic inflammatory cells related to antigen presentation and helper T-cell activation. CONCLUSION These results suggest that ADSC therapy is beneficial in cirrhosis, as it can repair and restore the function of the impaired liver.
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Affiliation(s)
- Akihiro Seki
- Department of Gastroenterology, Kanazawa University Hospital, Ishikawa, Japan; Disease Control and Homeostasis, Kanazawa University, Ishikawa, Japan
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221
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Abstract
Immune and inflammatory pathways have a central role in the pathogenesis of non-alcoholic fatty liver disease (NAFLD). Both the innate and adaptive immune systems contribute to the development of NAFLD. Pathogen-associated molecular patterns and danger-associated molecular patterns are known to activate a variety of pattern-recognition receptors that result in inflammation. The key features of the immune system and inflammatory pathways in the development of NAFLD are discussed in this review.
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Affiliation(s)
- Michal Ganz
- Department of Medicine, University of Massachusetts Medical School, LRB208, 364 Plantation Street, Worcester, MA 01605 USA
| | - Gyongyi Szabo
- Department of Medicine, University of Massachusetts Medical School, LRB208, 364 Plantation Street, Worcester, MA 01605 USA
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222
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Fabbrini E, Cella M, McCartney SA, Fuchs A, Abumrad NA, Pietka TA, Chen Z, Finck BN, Han DH, Magkos F, Conte C, Bradley D, Fraterrigo G, Eagon JC, Patterson BW, Colonna M, Klein S. Association between specific adipose tissue CD4+ T-cell populations and insulin resistance in obese individuals. Gastroenterology 2013; 145:366-74.e1-3. [PMID: 23597726 PMCID: PMC3756481 DOI: 10.1053/j.gastro.2013.04.010] [Citation(s) in RCA: 203] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/06/2012] [Revised: 04/04/2013] [Accepted: 04/07/2013] [Indexed: 12/13/2022]
Abstract
BACKGROUND & AIMS An increased number of macrophages in adipose tissue is associated with insulin resistance and metabolic dysfunction in obese people. However, little is known about other immune cells in adipose tissue from obese people, and whether they contribute to insulin resistance. We investigated the characteristics of T cells in adipose tissue from metabolically abnormal insulin-resistant obese (MAO) subjects, metabolically normal insulin-sensitive obese (MNO) subjects, and lean subjects. Insulin sensitivity was determined by using the hyperinsulinemic euglycemic clamp procedure. METHODS We assessed plasma cytokine concentrations and subcutaneous adipose tissue CD4(+) T-cell populations in 9 lean, 12 MNO, and 13 MAO subjects. Skeletal muscle and liver samples were collected from 19 additional obese patients undergoing bariatric surgery to determine the presence of selected cytokine receptors. RESULTS Adipose tissue from MAO subjects had 3- to 10-fold increases in numbers of CD4(+) T cells that produce interleukin (IL)-22 and IL-17 (a T-helper [Th] 17 and Th22 phenotype) compared with MNO and lean subjects. MAO subjects also had increased plasma concentrations of IL-22 and IL-6. Receptors for IL-17 and IL-22 were expressed in human liver and skeletal muscle samples. IL-17 and IL-22 inhibited uptake of glucose in skeletal muscle isolated from rats and reduced insulin sensitivity in cultured human hepatocytes. CONCLUSIONS Adipose tissue from MAO individuals contains increased numbers of Th17 and Th22 cells, which produce cytokines that cause metabolic dysfunction in liver and muscle in vitro. Additional studies are needed to determine whether these alterations in adipose tissue T cells contribute to the pathogenesis of insulin resistance in obese people.
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Affiliation(s)
- Elisa Fabbrini
- Center for Human Nutrition, Washington University School of Medicine, St Louis, Missouri 63110, USA
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223
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Henning JR, Graffeo CS, Rehman A, Fallon NC, Zambirinis CP, Ochi A, Barilla R, Jamal M, Deutsch M, Greco S, Ego-Osuala M, Saeed UB, Rao RS, Badar S, Quesada JP, Acehan D, Miller G. Dendritic cells limit fibroinflammatory injury in nonalcoholic steatohepatitis in mice. Hepatology 2013; 58:589-602. [PMID: 23322710 PMCID: PMC3638069 DOI: 10.1002/hep.26267] [Citation(s) in RCA: 131] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/04/2012] [Accepted: 12/21/2012] [Indexed: 12/12/2022]
Abstract
UNLABELLED Nonalcoholic steatohepatitis (NASH) is the most common etiology of chronic liver dysfunction in the United States and can progress to cirrhosis and liver failure. Inflammatory insult resulting from fatty infiltration of the liver is central to disease pathogenesis. Dendritic cells (DCs) are antigen-presenting cells with an emerging role in hepatic inflammation. We postulated that DCs are important in the progression of NASH. We found that intrahepatic DCs expand and mature in NASH liver and assume an activated immune phenotype. However, rather than mitigating the severity of NASH, DC depletion markedly exacerbated intrahepatic fibroinflammation. Our mechanistic studies support a regulatory role for DCs in NASH by limiting sterile inflammation through their role in the clearance of apoptotic cells and necrotic debris. We found that DCs limit CD8(+) T-cell expansion and restrict Toll-like receptor expression and cytokine production in innate immune effector cells in NASH, including Kupffer cells, neutrophils, and inflammatory monocytes. Consistent with their regulatory role in NASH, during the recovery phase of disease, ablation of DC populations results in delayed resolution of intrahepatic inflammation and fibroplasia. CONCLUSION Our findings support a role for DCs in modulating NASH. Targeting DC functional properties may hold promise for therapeutic intervention in NASH.
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Affiliation(s)
- Justin R. Henning
- S. Arthur Localio Laboratory, Department of Surgery, New York University School of Medicine, 550 First Avenue, New York, NY 10016
| | - Christopher S. Graffeo
- S. Arthur Localio Laboratory, Department of Cell Biology, New York University School of Medicine, 550 First Avenue, New York, NY 10016
| | - Adeel Rehman
- S. Arthur Localio Laboratory, Department of Surgery, New York University School of Medicine, 550 First Avenue, New York, NY 10016
| | - Nina C. Fallon
- S. Arthur Localio Laboratory, Department of Surgery, New York University School of Medicine, 550 First Avenue, New York, NY 10016
| | - Constantinos P. Zambirinis
- S. Arthur Localio Laboratory, Department of Surgery, New York University School of Medicine, 550 First Avenue, New York, NY 10016
| | - Atsuo Ochi
- S. Arthur Localio Laboratory, Department of Surgery, New York University School of Medicine, 550 First Avenue, New York, NY 10016
| | - Rocky Barilla
- S. Arthur Localio Laboratory, Department of Surgery, New York University School of Medicine, 550 First Avenue, New York, NY 10016
| | - Mohsin Jamal
- S. Arthur Localio Laboratory, Department of Surgery, New York University School of Medicine, 550 First Avenue, New York, NY 10016
| | - Michael Deutsch
- S. Arthur Localio Laboratory, Department of Surgery, New York University School of Medicine, 550 First Avenue, New York, NY 10016
| | - Stephanie Greco
- S. Arthur Localio Laboratory, Department of Surgery, New York University School of Medicine, 550 First Avenue, New York, NY 10016
| | - Melvin Ego-Osuala
- S. Arthur Localio Laboratory, Department of Surgery, New York University School of Medicine, 550 First Avenue, New York, NY 10016
| | - Usama Bin Saeed
- S. Arthur Localio Laboratory, Department of Surgery, New York University School of Medicine, 550 First Avenue, New York, NY 10016
| | - Raghavendra S. Rao
- S. Arthur Localio Laboratory, Department of Surgery, New York University School of Medicine, 550 First Avenue, New York, NY 10016
| | - Sana Badar
- S. Arthur Localio Laboratory, Department of Surgery, New York University School of Medicine, 550 First Avenue, New York, NY 10016
| | - Juan P. Quesada
- S. Arthur Localio Laboratory, Department of Surgery, New York University School of Medicine, 550 First Avenue, New York, NY 10016
| | - Devrim Acehan
- S. Arthur Localio Laboratory, Department of Cell Biology, New York University School of Medicine, 550 First Avenue, New York, NY 10016
| | - George Miller
- S. Arthur Localio Laboratory, Department of Surgery, New York University School of Medicine, 550 First Avenue, New York, NY 10016,S. Arthur Localio Laboratory, Department of Cell Biology, New York University School of Medicine, 550 First Avenue, New York, NY 10016
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Arindkar S, Bhattacharjee J, Kumar JM, Das B, Upadhyay P, Asif S, Juyal RC, Majumdar SS, Perumal N. Antigen peptide transporter 1 is involved in the development of fructose-induced hepatic steatosis in mice. J Gastroenterol Hepatol 2013; 28:1403-9. [PMID: 23488792 DOI: 10.1111/jgh.12186] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 02/13/2013] [Indexed: 01/05/2023]
Abstract
BACKGROUND AND AIM The purpose of this study is to assess whether the decrease in CD8 cells has any role in the development of non-alcoholic fatty liver disease (NAFLD). In this study, we therefore used antigen peptide transporter 1 (TAP1(-/-)) mice that cannot transport major histocompatibility complex class I antigens onto the cell surface resulting in failure of the generation of CD8 cells. METHODS Wild-type C57Bl/6J and TAP1(-/-) mice were fed with 30% fructose solution for 8 weeks. The percentage of CD4, CD8 cells in peripheral blood mononuclear cells, and liver were sorted by fluorescence-activated cell sorting in both control and fructose-treated mice. Bodyweight, histopathological changes, oil red O staining, glucose tolerance test, intraperitoneal insulin tolerance test, serum levels of triglycerides, cholesterol, aspartate aminotransferase, and alanine aminotransferase were also evaluated. Quantitative real-time polymerase chain reaction was performed to determine the expression of specific genes involved in development of fatty changes in the liver. RESULTS Chronic consumption of fructose in TAP1(-/-) mice did not develop NAFLD, insulin resistance, or change in level of CD8 cells. Moreover, there was delay in relative expression levels of genes involved in development of NAFLD in fructose-treated TAP1(-/-) mice. CONCLUSION Taken together, the data suggest that TAP1(-/-) -deficient mice displayed reduced levels of CD8 cells that have a vital role in the initiation and propagation of liver inflammation and is a casual role in the beginning of fructose-induced liver damage as well as insulin resistance in mice.
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225
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Xue ZM, Yao DM. Th17 cells and liver diseases. Shijie Huaren Xiaohua Zazhi 2013; 21:1185-1190. [DOI: 10.11569/wcjd.v21.i13.1185] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
In recent years, it has been demonstrated that T helper cells 17 (Th17) are closely related to the occurrence and development of many kinds of liver diseases such as viral hepatitis, autoimmune liver diseases and fatty liver diseases. Th17 cells are a new CD4+ T cell subset, which can interact with Th1, Th2 and Treg cells. There exists complex antagonistic or collaborative relationship among these cells. Understanding the role of Th17 cells in liver diseases will help explore the pathogenesis and treatment of these diseases.
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226
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Almeida J, Polvorosa MA, Gonzalez-Quintela A, Marcos M, Pastor I, Hernandez Cerceño ML, Orfao A, Laso FJ. Decreased peripheral blood CD4+/CD25+ regulatory T cells in patients with alcoholic hepatitis. Alcohol Clin Exp Res 2013; 37:1361-9. [PMID: 23550693 DOI: 10.1111/acer.12095] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2012] [Accepted: 01/09/2013] [Indexed: 12/19/2022]
Abstract
BACKGROUND Development of alcoholic hepatitis (AH) may be favored by the activation of the innate immune response. Recently, decreased numbers of circulating regulatory T cells (Tregs) have been reported in diseases associated with an immune activation status, but no studies have focused so far, in investigating the distribution of Tregs in chronic alcoholism and its potential association with liver disease. Here, we analyzed for the first time the frequency of peripheral blood (PB) Tregs and Treg subsets in AH and its relationship with the production of inflammatory cytokines by PB monocytes and dendritic cells (DCs). METHODS PB samples from 25 male patients with AH were studied; in parallel, 15 male chronic alcoholic patients without liver disease (AWLD) and 17 male healthy donors were also studied, as controls. The distribution of CD4⁺CD25hiCD127-/lo Tregs and their maturation subsets (naïve, central memory, and peripheral memory Tregs) was analyzed by flow cytometry. Spontaneous and in vitro-stimulated production of inflammatory cytokines by PB monocytes and DCs was analyzed by flow cytometry at the cytoplasmic level. RESULTS Patients with AH showed decreased (p < 0.05) numbers of PB CD4⁺CD25hiCD127-/lo Tregs at the expense of all maturation-associated subsets, while AWLD and healthy subjects showed a similar (p > 0.05) distribution of PB CD4⁺CD25hiCD127-/lo Tregs. Interestingly, significantly increased amounts of spontaneously produced inflammatory cytokines were found among circulating monocyte-derived DCs and monocytes from AH (and AWLD) patients in comparison with healthy donors. Conversely, the ability of these cell subsets to produce cytokines after in vitro stimulation was lower (p < 0.05) in AH versus the 2 control groups. CONCLUSIONS PB CD4⁺CD25hiCD127-/lo Tregs are significantly decreased in patients with AH when compared to both healthy and AWLD; this may contribute to explain the more pronounced activation of the innate immune response observed in AH, as reflected by an increased secretion of inflammatory cytokines by PB DCs and monocytes, and could facilitate the development of liver disease.
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Affiliation(s)
- Julia Almeida
- Cancer Research Center, (IBMCC; CSIC-USAL), IBSAL and Cytometry Service, University of Salamanca, Salamanca, Spain
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Loi P, Yuan Q, Torres D, Delbauve S, Laute MA, Lalmand MC, Pétein M, Goriely S, Goldman M, Flamand V. Interferon regulatory factor 3 deficiency leads to interleukin-17-mediated liver ischemia-reperfusion injury. Hepatology 2013; 57:351-61. [PMID: 22911673 DOI: 10.1002/hep.26022] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/09/2012] [Accepted: 08/01/2012] [Indexed: 01/08/2023]
Abstract
UNLABELLED Interferon regulatory factor 3 (IRF3) is an important transcription factor in Toll-like receptor 4 (TLR4) signaling, a pathway that is known to play a critical role in liver ischemia-reperfusion injury. In order to decipher the involvement of IRF3 in this setting, we first compared the intensity of hepatic lesions in IRF3-deficient versus wildtype mice. We found increased levels of blood transaminases, enhanced liver necrosis, and more pronounced neutrophil infiltrates in IRF3-deficient mice. Neutrophil depletion by administration of anti-Ly6G monoclonal antibody indicated that neutrophils play a dominant role in the development of severe liver necrosis in IRF3-deficient mice. Quantification of cytokine genes expression revealed increased liver expression of interleukin (IL)-12/IL-23p40, IL-23p19 messenger RNA (mRNA), and IL-17A mRNA in IRF3-deficient versus wildtype (WT) mice, whereas IL-27p28 mRNA expression was diminished in the absence of IRF3. The increased IL-17 production in IRF3-deficient mice was functionally relevant, as IL-17 neutralization prevented the enhanced hepatocellular damages and liver inflammation in these animals. Evidence for enhanced production of IL-23 and decreased accumulation of IL-27 cytokine in M1 type macrophage from IRF3-deficient mice was also observed after treatment with lipopolysaccharide, a setting in which liver gamma-delta T cells and invariant natural killer T cells were found to be involved in IL-17A hyperproduction. CONCLUSION IRF3-dependent events downstream of TLR4 control the IL-23/IL-17 axis in the liver and this regulatory role of IRF3 is relevant to liver ischemia-reperfusion injury.
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Affiliation(s)
- Patrizia Loi
- Institut d'Immunologie Médicale, Université Libre de Bruxelles, Gosselies, Belgium
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Li R, Xu L, Liang T, Li Y, Zhang S, Duan X. Puerarin mediates hepatoprotection against CCl4-induced hepatic fibrosis rats through attenuation of inflammation response and amelioration of metabolic function. Food Chem Toxicol 2012; 52:69-75. [PMID: 23146695 DOI: 10.1016/j.fct.2012.10.059] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2012] [Revised: 10/27/2012] [Accepted: 10/29/2012] [Indexed: 12/12/2022]
Abstract
This study was designed to evaluate the potential effects of puerarin (PR), an effective isoflavonoid compound purified from Pueraria lobata, in treating hepatic fibrosis (HF) rats induced by carbon tetrachloride (CCl(4), 2 mL kg(-1) d(-1)). Compared to model control, PR treatment effectively lowered the serum levels of alanine aminotransferase (ALT), aspartate aminotransferase (AST), albumin (Alb), total protein (TP) in HF rats. Masson stained analysis showed that the condition of HF rats was mitigated. Meanwhile, the tumor necrosis factor alpha (TNF-α), nuclear factor-kappa B (NF-κB) expressions were significantly down-regulated at protein level by PR intervention. Additionally, the activity of superoxide dismutase (SOD) was elevated, while the content of malondialdehyde (MDA) was lessened in liver tissue. As revealed by immunohistochemistry assay, PR therapy resulted in reduced production of transforming growth factor-βl (TGF-βl). Moreover, it also was attributed to decreased mRNA level of inducible nitric oxide synthase (iNOS) using RT-PCR analysis. These findings demonstrate that puerarin successfully reverses hepatotoxicity in CCl(4)-induced HF rats via the underlying mechanisms of regulating serum enzymes and attenuating TNF-α/NF-κB pathway for anti-inflammation response, as well as improving metabolic function in liver tissue.
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Affiliation(s)
- Rong Li
- Department of Physiology, Guilin Medical University, Guilin, Guangxi 541004, PR China
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Qi ZX, Wang LY, Fan YC, Zhang JJ, Li T, Wang K. Increased peripheral RORα and RORγt mRNA expression is associated with acute-on-chronic hepatitis B liver failure. J Viral Hepat 2012; 19:811-22. [PMID: 23043388 DOI: 10.1111/j.1365-2893.2012.01603.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
T helper cells17 (Th17) have accurate but inconclusive roles in the pathogenesis of acute-on-chronic hepatitis B liver failure (ACHBLF). Retinoic acid-related orphan receptor γ t(RORγt) and RORα are two lineage-specific nuclear receptors directly mediating Th17 differentiation. This study was aimed to evaluate the gene expression of RORα and RORγt and their potential role in ACHBLF. Forty patients with liver failure, 30 with chronic hepatitis B (CHB) and 20 healthy controls were studied. The mRNA levels of RORα and RORγt in peripheral mononuclear cells were determined by quantitative real-time polymerase chain reaction. The frequency of peripheral Th17 cells was determined using flow cytometry. The serum levels of interleukin-6(IL-6), transforming growth factor -β (TGF-β), interleukin-17(IL-17), interleukin-23(IL-23) and interferon-γ (IFN-γ) were measured by enzyme-linked immunosorbent assay. The frequency of peripheral Th17 cells in patients with liver failure was significantly increased compared to patients with CHB and controls. The peripheral mRNA levels of RORα and RORγt in hepatitis B-associated acute-on-chronic liver failure were significantly higher than in patients with CHB and controls as were the serum levels of IL-6 and TGF-β. The serum level of IFN-γ in patients with acute-on-chronic liver failure from HBV was significantly higher than patients with CHB but lower than controls. In patients with acute-on-chronic liver failure associated with HBV, RORγt, IL-6 and IL-23 were positively correlated with the frequency of Th17 cells, while RORα, TGF-β and IFN-γ had no correlation with the latter. The mRNA level of RORγt was positively correlated with model of end-stage liver disease (MELD) score, but there was no correlation of RORα and MELD score. RORγt plays an important role in the pathogenesis of acute-on-chronic HBV-associated liver failure and might be considered to be a candidate factor consistent with the severity of disease.
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Affiliation(s)
- Z-X Qi
- Department of Hepatology, Qilu Hospital of Shandong University, Jinan, China
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