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Panteleeva AA, Razgildina ND, Brovin DL, Pobozheva IA, Dracheva KV, Berkovich OA, Polyakova EA, Belyaeva OD, Baranova EI, Pchelina SN, Miroshnikova VV. The Expression of Genes Encoding ABCA1 and ABCG1 Transporters and PPARγ, LXRβ, and RORα Transcriptional Factors in Subcutaneous and Visceral Adipose Tissue in Women with Metabolic Syndrome. Mol Biol 2021. [DOI: 10.1134/s0026893321010131] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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52
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Plebanek MP, Sturdivant M, DeVito NC, Hanks BA. Role of dendritic cell metabolic reprogramming in tumor immune evasion. Int Immunol 2020; 32:485-491. [PMID: 32449776 DOI: 10.1093/intimm/dxaa036] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2020] [Accepted: 05/18/2020] [Indexed: 12/27/2022] Open
Abstract
The dendritic cell (DC) is recognized as a vital mediator of anti-tumor immunity. More recent studies have also demonstrated the important role of DCs in the generation of effective responses to checkpoint inhibitor immunotherapy. Metabolic programming of DCs dictates their functionality and can determine which DCs become immunostimulatory versus those that develop a tolerized phenotype capable of actively suppressing effector T-cell responses to cancers. As a result, there is great interest in understanding what mechanisms have evolved in cancers to alter these metabolic pathways, thereby allowing for their continued progression and metastasis. The therapeutic strategies developed to reverse these processes of DC tolerization in the tumor microenvironment represent promising candidates for future testing in combination immunotherapy clinical trials.
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53
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Kuddus SA, Bhuiyan MI, Subhan N, Shohag MH, Rahman A, Hossain MM, Alam MA, Khan F. Antioxidant-rich Tamarindus indica L. leaf extract reduced high-fat diet-induced obesity in rat through modulation of gene expression. CLINICAL PHYTOSCIENCE 2020. [DOI: 10.1186/s40816-020-00213-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Abstract
Background
Different parts of the medicinal plant Tamarindus indica L. are full of phytochemicals that are able to reduce elevated blood pressure, blood sugar and lipids. These pharmacological effects are due to the presence of antioxidant type compounds in those parts of the plant. This study was aimed to explore the molecular mechanism of anti-obesity effects of ethanolic extract of T. indica L. leaves (TILE) through the evaluation of biochemical parameters and gene expression analysis in high-fat diet (HFD) consuming Wistar rats.
Methods
Male Wistar rats were supplied with a standard diet (SD), or HFD, or HFD with 100 mg/kg or 200 mg/kg or 400 mg/kg TILE for 8 weeks. The body weight, liver weight, fat weight, plasma lipids, and oxidative stress-related parameters were measured. The transcript levels of different adipogenesis related transcription factors, lipogenic enzymes, and lipolytic enzymes were also evaluated by quantitative real-time PCR.
Result
Phytochemical analysis demonstrated that TILE is enriched with a substantial level of polyphenols (287.20 ± 9.21 mg GAE/g extract) and flavonoids (107.52 ± 11.12 mg QE/g extract) which might be the reason of significant antioxidant and radical scavenging activities. Feeding of TILE (400 mg/kg/day) to HFD-fed rats increased activity of superoxide dismutase and catalase which is reflected as a significant reduction of oxidative stress markers like nitric oxide and malondialdehyde. TILE (400 mg/kg/day) feeding also down-regulated the mRNA levels of proadipogenic transcription factors including liver X receptor alpha (LXRα), peroxisome proliferator-activated receptor gamma (PPARγ), and sterol regulatory element-binding protein 1c (SREBP1c) in diet-induced obese rats. As a consequence of this, the mRNA level of lipogenic enzymes like acetyl-CoA carboxylase (ACC), fatty acid synthase (FAS), diacylglycerol acyltransferase (DGAT), and HMG-CoA reductase was down-regulated with a parallel up-regulation of the transcript level of lipolytic enzyme, hormone-sensitive lipase (HSL).
Conclusion
Observations from this study indicate that antioxidant-rich TILE can reduce HFD-induced body weight, fat weight and liver weight as well as blood lipids through down-regulating the gene expression of proadipogenic transcription factors and lipogenic enzymes with a concerted diminution of the gene expression of lipolytic enzyme, HSL.
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Hajishengallis G, Chavakis T, Lambris JD. Current understanding of periodontal disease pathogenesis and targets for host-modulation therapy. Periodontol 2000 2020; 84:14-34. [PMID: 32844416 DOI: 10.1111/prd.12331] [Citation(s) in RCA: 166] [Impact Index Per Article: 41.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Recent advances indicate that periodontitis is driven by reciprocally reinforced interactions between a dysbiotic microbiome and dysregulated inflammation. Inflammation is not only a consequence of dysbiosis but, via mediating tissue dysfunction and damage, fuels further growth of selectively dysbiotic communities of bacteria (inflammophiles), thereby generating a self-sustained feed-forward loop that perpetuates the disease. These considerations provide a strong rationale for developing adjunctive host-modulation therapies for the treatment of periodontitis. Such host-modulation approaches aim to inhibit harmful inflammation and promote its resolution or to interfere directly with downstream effectors of connective tissue and bone destruction. This paper reviews diverse strategies targeted to modulate the host periodontal response and discusses their mechanisms of action, perceived safety, and potential for clinical application.
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Affiliation(s)
- George Hajishengallis
- Department of Basic and Translational Sciences, Penn Dental Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Triantafyllos Chavakis
- Department of Clinical Pathobiochemistry, Faculty of Medicine, Institute for Clinical Chemistry and Laboratory Medicine, Technische Universität Dresden, Dresden, Germany
| | - John D Lambris
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
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55
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Choi C, Finlay DK. Diverse Immunoregulatory Roles of Oxysterols-The Oxidized Cholesterol Metabolites. Metabolites 2020; 10:metabo10100384. [PMID: 32998240 PMCID: PMC7601797 DOI: 10.3390/metabo10100384] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Revised: 09/14/2020] [Accepted: 09/24/2020] [Indexed: 12/15/2022] Open
Abstract
Intermediates of both cholesterol synthesis and cholesterol metabolism can have diverse roles in the control of cellular processes that go beyond the control of cholesterol homeostasis. For example, oxidized forms of cholesterol, called oxysterols have functions ranging from the control of gene expression, signal transduction and cell migration. This is of particular interest in the context of immunology and immunometabolism where we now know that metabolic processes are key towards shaping the nature of immune responses. Equally, aberrant metabolic processes including altered cholesterol homeostasis contribute to immune dysregulation and dysfunction in pathological situations. This review article brings together our current understanding of how oxysterols affect the control of immune responses in diverse immunological settings.
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Affiliation(s)
- Chloe Choi
- School of Biochemistry and Immunology, Trinity Biomedical Sciences Institute, Trinity College Dublin, Pearse Street 152-160, Dublin 2, Ireland
- Correspondence: (C.C.); (D.K.F.); Tel.: +353-1-896-3564 (D.K.F.)
| | - David K. Finlay
- School of Biochemistry and Immunology, Trinity Biomedical Sciences Institute, Trinity College Dublin, Pearse Street 152-160, Dublin 2, Ireland
- School of Pharmacy and Pharmaceutical Sciences, Trinity Biomedical Sciences Institute, Trinity College Dublin, Pearse Street 152-160, Dublin 2, Ireland
- Correspondence: (C.C.); (D.K.F.); Tel.: +353-1-896-3564 (D.K.F.)
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56
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Marcello A, Civra A, Milan Bonotto R, Nascimento Alves L, Rajasekharan S, Giacobone C, Caccia C, Cavalli R, Adami M, Brambilla P, Lembo D, Poli G, Leoni V. The cholesterol metabolite 27-hydroxycholesterol inhibits SARS-CoV-2 and is markedly decreased in COVID-19 patients. Redox Biol 2020; 36:101682. [PMID: 32810737 PMCID: PMC7416714 DOI: 10.1016/j.redox.2020.101682] [Citation(s) in RCA: 67] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Revised: 08/01/2020] [Accepted: 08/06/2020] [Indexed: 12/26/2022] Open
Abstract
There is an urgent need to identify antivirals against the coronavirus SARS-CoV-2 in the current COVID-19 pandemic and to contain future similar emergencies early on. Specific side-chain cholesterol oxidation products of the oxysterols family have been shown to inhibit a large variety of both enveloped and non-enveloped human viral pathogens. Here we report on the in vitro inhibitory activity of the redox active oxysterol 27-hydroxycholesterol against SARS-CoV-2 and against one of the common cold agents HCoV-OC43 human coronavirus without significant cytotoxicity. Interestingly, physiological serum levels of 27-hydroxycholesterol in SARS-CoV-2 positive subjects were significantly decreased compared to the matched control group, reaching a marked 50% reduction in severe COVID-19 cases. Moreover, no correlation at all was observed between 24-hydroxycholesterol and 25-hydroxycholesterol serum levels and the severity of the disease. Opposite to that of 27-hydroxycholesterol was the behaviour of two recognized markers of redox imbalance, i.e. 7-ketocholesterol and 7β-hydroxycholesterol, whose serum levels were significantly increased especially in severe COVID-19. The exogenous administration of 27-hydroxycholesterol may represent in the near future a valid antiviral strategy in the worsening of diseases caused by present and emerging coronaviruses. 27-hydroxycholesterol (27OHC) inhibits the replication of SARS-CoV-2 by interfering with its entry into target cells. The broad antiviral effect of 27OHC is also exerted against another β-coronavirus, HCoV-OC43. Blood levels of 27OHC were decreased in SARS-CoV-2 infected individuals, especially in patients with severe COVID-19. COVID-19 patients showed increased serum levels of 7-ketocholesterol and 7β-hydroxycholesterol, markers of oxidative stress.
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Affiliation(s)
- Alessandro Marcello
- Laboratory of Molecular Virology, International Centre for Genetic Engineering and Biotechnology (ICGEB), Trieste, 34149, Italy
| | - Andrea Civra
- Laboratory of Molecular Virology and Antiviral Research, Department of Clinical and Biological Sciences, University of Turin, San Luigi Hospital, Orbassano, Turin, 10043, Italy
| | - Rafaela Milan Bonotto
- Laboratory of Molecular Virology, International Centre for Genetic Engineering and Biotechnology (ICGEB), Trieste, 34149, Italy
| | - Lais Nascimento Alves
- Laboratory of Molecular Virology, International Centre for Genetic Engineering and Biotechnology (ICGEB), Trieste, 34149, Italy
| | - Sreejith Rajasekharan
- Laboratory of Molecular Virology, International Centre for Genetic Engineering and Biotechnology (ICGEB), Trieste, 34149, Italy
| | - Chiara Giacobone
- Laboratory of Clinical Chemistry, Hospitals of Desio and Monza, ASST-Monza and Department of Medicine and Surgery, University of Milano-Bicocca, Monza, 20900, Italy
| | - Claudio Caccia
- Unit of Medical Genetics and Neurogenetics, Fondazione IRCCS Istituto Neurologico Carlo Besta, Milan, 20133, Italy
| | - Roberta Cavalli
- Department of Drug Science and Technology, University of Turin, Turin, Italy
| | - Marco Adami
- Department of Pharmacological and Biomolecular Sciences, University of Milan, 20133, Italy
| | - Paolo Brambilla
- Laboratory of Clinical Chemistry, Hospitals of Desio and Monza, ASST-Monza and Department of Medicine and Surgery, University of Milano-Bicocca, Monza, 20900, Italy
| | - David Lembo
- Laboratory of Molecular Virology and Antiviral Research, Department of Clinical and Biological Sciences, University of Turin, San Luigi Hospital, Orbassano, Turin, 10043, Italy.
| | - Giuseppe Poli
- Unit of General Pathology and Physiopathology, Department of Clinical and Biological Sciences, University of Turin, San Luigi Hospital, Orbassano, Turin, 10043, Italy.
| | - Valerio Leoni
- Laboratory of Clinical Chemistry, Hospitals of Desio and Monza, ASST-Monza and Department of Medicine and Surgery, University of Milano-Bicocca, Monza, 20900, Italy
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57
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Ritter MJ, Amano I, Hollenberg AN. Thyroid Hormone Signaling and the Liver. Hepatology 2020; 72:742-752. [PMID: 32343421 DOI: 10.1002/hep.31296] [Citation(s) in RCA: 77] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Revised: 03/30/2020] [Accepted: 04/17/2020] [Indexed: 12/11/2022]
Abstract
Thyroid hormone (TH) plays a critical role in maintaining metabolic homeostasis throughout life. It is well known that the liver and thyroid are intimately linked, with TH playing important roles in de novo lipogenesis, beta-oxidation (fatty acid oxidation), cholesterol metabolism, and carbohydrate metabolism. Indeed, patients with hypothyroidism have abnormal lipid panels with higher levels of low-density lipoprotein levels, triglycerides (triacylglycerol; TAG), and apolipoprotein B levels. Even in euthyroid patients, lower serum-free thyroxine levels are associated with higher total cholesterol levels, LDL, and TAG levels. In addition to abnormal serum lipids, the risk of nonalcoholic fatty liver disease (NAFLD) increases with lower free thyroxine levels. As free thyroxine rises, the risk of NAFLD is reduced. This has led to numerous animal studies and clinical trials investigating TH analogs and TH receptor agonists as potential therapies for NAFLD and hyperlipidemia. Thus, TH plays an important role in maintaining hepatic homeostasis, and this continues to be an important area of study. A review of TH action and TH actions on the liver will be presented here.
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Affiliation(s)
- Megan J Ritter
- Division of Endocrinology, Weill Cornell Medicine, New York, NY
| | - Izuki Amano
- Division of Endocrinology, Weill Cornell Medicine, New York, NY.,Department of Integrative Physiology, Gunma University Graduate School of Medicine, Maebashi, Japan
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58
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Ehinger E, Ghosheh Y, Pramod AB, Lin J, Hanna DB, Mueller K, Durant CP, Baas L, Qi Q, Wang T, Buscher K, Anastos K, Lazar JM, Mack WJ, Tien PC, Cohen MH, Ofotokun I, Gange S, Heath SL, Hodis HN, Tracy RP, Landay AL, Kaplan RC, Ley K. Classical monocyte transcriptomes reveal significant anti-inflammatory statin effect in women with chronic HIV. Cardiovasc Res 2020; 117:1166-1177. [PMID: 32658258 DOI: 10.1093/cvr/cvaa188] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Revised: 06/04/2020] [Accepted: 06/24/2020] [Indexed: 12/12/2022] Open
Abstract
AIMS During virally suppressed chronic HIV infection, persistent inflammation contributes to the development of cardiovascular disease (CVD), a major comorbidity in people living with HIV (LWH). Classical blood monocytes (CMs) remain activated during antiretroviral therapy and are a major source of pro-inflammatory and pro-thrombotic factors that contribute to atherosclerotic plaque development and instability. METHODS AND RESULTS Here, we identify transcriptomic changes in circulating CMs in peripheral blood mononuclear cell samples from participants of the Women's Interagency HIV Study, selected by HIV and subclinical CVD (sCVD) status. We flow-sorted CM from participants of the Women's Interagency HIV Study and deep-sequenced their mRNA (n = 92). CMs of HIV+ participants showed elevated interleukin (IL)-6, IL-1β, and IL-12β, overlapping with many transcripts identified in sCVD+ participants. In sCVD+ participants LWH, those reporting statin use showed reduced pro-inflammatory gene expression to a level comparable with healthy (HIV-sCVD-) participants. Statin non-users maintained an elevated inflammatory profile and increased cytokine production. CONCLUSION Statin therapy has been associated with a lower risk of cardiac events, such as myocardial infarction in the general population, but not in those LWH. Our data suggest that women LWH may benefit from statin therapy even in the absence of overt CVD.
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Affiliation(s)
- Erik Ehinger
- Laboratory of Inflammation Biology, La Jolla Institute for Immunology, 9420 Athena Circle, La Jolla, CA 92037, USA
| | - Yanal Ghosheh
- Laboratory of Inflammation Biology, La Jolla Institute for Immunology, 9420 Athena Circle, La Jolla, CA 92037, USA
| | - Akula Bala Pramod
- Laboratory of Inflammation Biology, La Jolla Institute for Immunology, 9420 Athena Circle, La Jolla, CA 92037, USA
| | - Juan Lin
- Department of Epidemiology and Population Health, Albert Einstein College of Medicine, Bronx, NY, USA
| | - David B Hanna
- Department of Epidemiology and Population Health, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Karin Mueller
- Laboratory of Inflammation Biology, La Jolla Institute for Immunology, 9420 Athena Circle, La Jolla, CA 92037, USA
| | - Christopher P Durant
- Laboratory of Inflammation Biology, La Jolla Institute for Immunology, 9420 Athena Circle, La Jolla, CA 92037, USA
| | - Livia Baas
- Laboratory of Inflammation Biology, La Jolla Institute for Immunology, 9420 Athena Circle, La Jolla, CA 92037, USA
| | - Qibin Qi
- Department of Epidemiology and Population Health, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Tao Wang
- Department of Epidemiology and Population Health, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Konrad Buscher
- Laboratory of Inflammation Biology, La Jolla Institute for Immunology, 9420 Athena Circle, La Jolla, CA 92037, USA
| | - Kathryn Anastos
- Department of Medicine, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Jason M Lazar
- Department of Medicine, State University of New York, Downstate Medical Center, Bronx, NY, USA.,Department of Epidemiology & Population Health, State University of New York, Downstate Medical Center, Bronx, NY, USA
| | - Wendy J Mack
- Department of Preventive Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Phyllis C Tien
- Department of Medicine and Medical Service, University of California, San Francisco, San Francisco, CA, USA.,Department of Veterans Affairs Medical Center, University of California, San Francisco, San Francisco, CA, USA
| | - Mardge H Cohen
- Department of Medicine, John Stroger Hospital and Rush University, Chicago, IL, USA
| | - Igho Ofotokun
- Department of Medicine, Infectious Disease Division and Grady Health Care System, Emory University School of Medicine, Atlanta, GA, USA
| | - Stephen Gange
- Division of Cardiovascular Medicine, Johns Hopkins University, Bloomberg School of Public Health, Baltimore, MD, USA
| | - Sonya L Heath
- Department of Medicine, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Howard N Hodis
- Departments of Medicine and Preventative Medicine, Atherosclerosis Research Unit, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Russell P Tracy
- Department of Pathology & Laboratory Medicine and Biochemistry, University of Vermont Larner College of Medicine, Colchester, VT, USA
| | - Alan L Landay
- Department of Internal Medicine, Rush University Medical Center, Chicago, IL, USA
| | - Robert C Kaplan
- Department of Epidemiology and Population Health, Albert Einstein College of Medicine, Bronx, NY, USA.,Fred Hutchinson Cancer Research Center, Division of Public Health Sciences, Seattle WA 98109, USA
| | - Klaus Ley
- Laboratory of Inflammation Biology, La Jolla Institute for Immunology, 9420 Athena Circle, La Jolla, CA 92037, USA.,Department of Bioengineering, University of California San Diego, San Diego, CA, USA
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59
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Yang X, Chang Y, Wei W. Emerging role of targeting macrophages in rheumatoid arthritis: Focus on polarization, metabolism and apoptosis. Cell Prolif 2020; 53:e12854. [PMID: 32530555 PMCID: PMC7377929 DOI: 10.1111/cpr.12854] [Citation(s) in RCA: 92] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Revised: 03/09/2020] [Accepted: 05/14/2020] [Indexed: 12/17/2022] Open
Abstract
Macrophages maintain a dynamic balance in physiology. Various known or unknown microenvironmental signals influence the polarization, activation and death of macrophages, which creates an imbalance that leads to disease. Rheumatoid arthritis (RA) is characterized by the massive infiltration of a variety of chronic inflammatory cells in synovia. Abundant activated macrophages found in RA synovia are an early hallmark of RA, and the number of these macrophages can be decreased after effective treatment. In RA, the proportion of M1 (pro‐inflammatory macrophages) is higher than that of M2 (anti‐inflammatory macrophages). The increased pro‐inflammatory ability of macrophages is related to their excessive activation and proliferation as well as an enhanced anti‐apoptosis ability. At present, there are no clinical therapies specific to macrophages in RA. Understanding the mechanisms and functional consequences of the heterogeneity of macrophages will aid in confirming their potential role in inflammation development. This review will outline RA‐related macrophage properties (focus on polarization, metabolism and apoptosis) as well as the origin of macrophages. The molecular mechanisms that drive macrophage properties also be elucidated to identify novel therapeutic targets for RA and other autoimmune disease.
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Affiliation(s)
- Xuezhi Yang
- Institute of Clinical Pharmacology, Key Laboratory of Anti-inflammatory and Immune Medicine (Anhui Medical University), Ministry of Education, Anhui Collaborative Innovation Center of Anti-inflammatory and Immune Medicine, Anhui Medical University, Hefei, China
| | - Yan Chang
- Institute of Clinical Pharmacology, Key Laboratory of Anti-inflammatory and Immune Medicine (Anhui Medical University), Ministry of Education, Anhui Collaborative Innovation Center of Anti-inflammatory and Immune Medicine, Anhui Medical University, Hefei, China
| | - Wei Wei
- Institute of Clinical Pharmacology, Key Laboratory of Anti-inflammatory and Immune Medicine (Anhui Medical University), Ministry of Education, Anhui Collaborative Innovation Center of Anti-inflammatory and Immune Medicine, Anhui Medical University, Hefei, China
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60
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Boada-Romero E, Martinez J, Heckmann BL, Green DR. The clearance of dead cells by efferocytosis. Nat Rev Mol Cell Biol 2020; 21:398-414. [PMID: 32251387 DOI: 10.1038/s41580-020-0232-1] [Citation(s) in RCA: 407] [Impact Index Per Article: 101.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/27/2020] [Indexed: 02/06/2023]
Abstract
Multiple modes of cell death have been identified, each with a unique function and each induced in a setting-dependent manner. As billions of cells die during mammalian embryogenesis and daily in adult organisms, clearing dead cells and associated cellular debris is important in physiology. In this Review, we present an overview of the phagocytosis of dead and dying cells, a process known as efferocytosis. Efferocytosis is performed by macrophages and to a lesser extent by other 'professional' phagocytes (such as monocytes and dendritic cells) and 'non-professional' phagocytes, such as epithelial cells. Recent discoveries have shed light on this process and how it functions to maintain tissue homeostasis, tissue repair and organismal health. Here, we outline the mechanisms of efferocytosis, from the recognition of dying cells through to phagocytic engulfment and homeostatic resolution, and highlight the pathophysiological consequences that can arise when this process is abrogated.
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Affiliation(s)
- Emilio Boada-Romero
- Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Jennifer Martinez
- Inflammation & Autoimmunity Group, National Institute for Environmental Health Sciences, Research Triangle Park, Durham, NC, USA
| | - Bradlee L Heckmann
- Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN, USA.
| | - Douglas R Green
- Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN, USA.
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61
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Brusletto BS, Løberg EM, Hellerud BC, Goverud IL, Berg JP, Olstad OK, Gopinathan U, Brandtzaeg P, Øvstebø R. Extensive Changes in Transcriptomic "Fingerprints" and Immunological Cells in the Large Organs of Patients Dying of Acute Septic Shock and Multiple Organ Failure Caused by Neisseria meningitidis. Front Cell Infect Microbiol 2020; 10:42. [PMID: 32154187 PMCID: PMC7045056 DOI: 10.3389/fcimb.2020.00042] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Accepted: 01/22/2020] [Indexed: 12/16/2022] Open
Abstract
Background: Patients developing meningococcal septic shock reveal levels of Neisseria meningitidis (106-108/mL) and endotoxin (101-103 EU/mL) in the circulation and organs, leading to acute cardiovascular, pulmonary and renal failure, coagulopathy and a high case fatality rate within 24 h. Objective: To investigate transcriptional profiles in heart, lungs, kidneys, liver, and spleen and immunostain key inflammatory cells and proteins in post mortem formalin-fixed, paraffin-embedded (FFPE) tissue samples from meningococcal septic shock patients. Patients and Methods: Total RNA was isolated from FFPE and fresh frozen (FF) tissue samples from five patients and two controls (acute non-infectious death). Differential expression of genes was detected using Affymetrix microarray analysis. Lung and heart tissue samples were immunostained for T-and B cells, macrophages, neutrophils and the inflammatory markers PAI-1 and MCP-1. Inflammatory mediators were quantified in lysates from FF tissues. Results: The transcriptional profiles showed a complex pattern of protein-coding and non-coding RNAs with significant regulation of pathways associated with organismal death, cell death and survival, leukocyte migration, cellular movement, proliferation of cells, cell-to-cell signaling, immune cell trafficking, and inflammatory responses in an organ-specific clustering manner. The canonical pathways including acute phase response-, EIF2-, TREM1-, IL-6-, HMBG1-, PPAR signaling, and LXR/RXR activation were associated with acute heart, pulmonary, and renal failure. Fewer genes were regulated in the liver and particularly in the spleen. The main upstream regulators were TNF, IL-1β, IL-6, RICTOR, miR-6739-3p, and CD3. Increased numbers of inflammatory cells (CD68+, MPO+, CD3+, and CD20+) were found in lungs and heart. PAI-1 inhibiting fibrinolysis and MCP-1 attracting leukocyte were found significantly present in the septic tissue samples compared to the controls. Conclusions: FFPE tissue samples can be suitable for gene expression studies as well as immunostaining of specific cells or molecules. The most pronounced gene expression patterns were found in the organs with highest levels of Neisseria meningitidis DNA. Thousands of protein-coding and non-coding RNA transcripts were altered in lungs, heart and kidneys. We identified specific biomarker panels both protein-coding and non-coding RNA transcripts, which differed from organ to organ. Involvement of many genes and pathways add up and the combined effect induce organ failure.
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Affiliation(s)
- Berit Sletbakk Brusletto
- Department of Medical Biochemistry, Oslo University Hospital, Oslo, Norway.,Institute of Clinical Medicine, University of Oslo, Oslo, Norway
| | - Else Marit Løberg
- Institute of Clinical Medicine, University of Oslo, Oslo, Norway.,Department of Pathology, Oslo University Hospital, Oslo, Norway
| | | | - Ingeborg Løstegaard Goverud
- Institute of Clinical Medicine, University of Oslo, Oslo, Norway.,Department of Pathology, Oslo University Hospital, Oslo, Norway
| | - Jens Petter Berg
- Department of Medical Biochemistry, Oslo University Hospital, Oslo, Norway.,Institute of Clinical Medicine, University of Oslo, Oslo, Norway
| | | | - Unni Gopinathan
- Department of Medical Biochemistry, Oslo University Hospital, Oslo, Norway.,Institute of Clinical Medicine, University of Oslo, Oslo, Norway
| | - Petter Brandtzaeg
- Department of Medical Biochemistry, Oslo University Hospital, Oslo, Norway.,Institute of Clinical Medicine, University of Oslo, Oslo, Norway.,Department of Pediatrics, Oslo University Hospital, Oslo, Norway
| | - Reidun Øvstebø
- Department of Medical Biochemistry, Oslo University Hospital, Oslo, Norway
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Biswas L, Zeng Z, Graham A, Shu X. Gypenosides mediate cholesterol efflux and suppress oxidized LDL induced inflammation in retinal pigment epithelium cells. Exp Eye Res 2020; 191:107931. [DOI: 10.1016/j.exer.2020.107931] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2019] [Revised: 12/16/2019] [Accepted: 01/08/2020] [Indexed: 02/07/2023]
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63
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Diao L, Yousuf Y, Amini‐Nik S, Jeschke MG. Increased proliferation of hepatic periportal ductal progenitor cells contributes to persistent hypermetabolism after trauma. J Cell Mol Med 2020; 24:1578-1587. [PMID: 31793707 PMCID: PMC6991656 DOI: 10.1111/jcmm.14845] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2019] [Revised: 10/16/2019] [Accepted: 10/28/2019] [Indexed: 12/13/2022] Open
Abstract
Prolonged and persistent hypermetabolism and excessive inflammatory response after severe trauma is detrimental and associated with poor outcome. The predisposing pathology or signals mediating this complex response are essentially unknown. As the liver is the central organ mediating the systemic metabolic responses and considering that adult hepatic stem cells are on top of the hierarchy of cell differentiation and may pass epigenetic information to their progeny, we asked whether liver progenitor cells are activated, signal hypermetabolism upon post-traumatic cellular stress responses, and pass this to differentiated progeny. We generated Sox9CreERT2 : ROSA26 EYFP mice to lineage-trace the periportal ductal progenitor cells (PDPCs) and verify the fate of these cells post-burn. We observed increased proliferation of PDPCs and their progeny peaking around two weeks post-burn, concomitant with the hepatomegaly and the cellular stress responses. We then sorted out PDPCs, PDPC-derived hepatocytes and mature hepatocytes, compared their transcriptome and showed that PDPCs and their progeny present a significant up-regulation in signalling pathways associated with inflammation and metabolic activation, contributing to persistent hypermetabolic and hyper-inflammatory state. Furthermore, concomitant down-regulation of LXR signalling in PDPCs and their progeny implicates the therapeutic potential of early and short-term administration of LXR agonists in ameliorating such persistent hypermetabolism.
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Affiliation(s)
- Li Diao
- Sunnybrook Research InstituteTorontoONCanada
| | | | - Saeid Amini‐Nik
- Sunnybrook Research InstituteTorontoONCanada
- Division of Plastic SurgeryDepartment of SurgeryUniversity of TorontoTorontoONCanada
- Department of Laboratory Medicine and Pathobiology (LMP)University of TorontoTorontoONCanada
| | - Marc G. Jeschke
- Sunnybrook Research InstituteTorontoONCanada
- Division of Plastic SurgeryDepartment of SurgeryUniversity of TorontoTorontoONCanada
- Department of ImmunologyUniversity of TorontoTorontoONCanada
- Ross Tilley Burn CentreSunnybrook Health Sciences CentreTorontoONCanada
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64
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Venosa A, Smith LC, Murray A, Banota T, Gow AJ, Laskin JD, Laskin DL. Regulation of Macrophage Foam Cell Formation During Nitrogen Mustard (NM)-Induced Pulmonary Fibrosis by Lung Lipids. Toxicol Sci 2019; 172:344-358. [PMID: 31428777 PMCID: PMC6876262 DOI: 10.1093/toxsci/kfz187] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Nitrogen mustard (NM) is a vesicant known to target the lung, causing acute injury which progresses to fibrosis. Evidence suggests that activated macrophages contribute to the pathologic response to NM. In these studies, we analyzed the role of lung lipids generated following NM exposure on macrophage activation and phenotype. Treatment of rats with NM (0.125 mg/kg, i.t.) resulted in a time-related increase in enlarged vacuolated macrophages in the lung. At 28 days postexposure, macrophages stained positively for Oil Red O, a marker of neutral lipids. This was correlated with an accumulation of oxidized phospholipids in lung macrophages and epithelial cells and increases in bronchoalveolar lavage fluid (BAL) phospholipids and cholesterol. RNA-sequencing and immunohistochemical analysis revealed that lipid handling pathways under the control of the transcription factors liver-X receptor (LXR), farnesoid-X receptor (FXR), peroxisome proliferator-activated receptor (PPAR)-ɣ, and sterol regulatory element-binding protein (SREBP) were significantly altered following NM exposure. Whereas at 1-3 days post NM, FXR and the downstream oxidized low-density lipoprotein receptor, Cd36, were increased, Lxr and the lipid efflux transporters, Abca1 and Abcg1, were reduced. Treatment of naïve lung macrophages with phospholipid and cholesterol enriched large aggregate fractions of BAL prepared 3 days after NM exposure resulted in upregulation of Nos2 and Ptgs2, markers of proinflammatory activation, whereas large aggregate fractions prepared 28 days post NM upregulated expression of the anti-inflammatory markers, Il10, Cd163, and Cx3cr1, and induced the formation of lipid-laden foamy macrophages. These data suggest that NM-induced alterations in lipid handling and metabolism drive macrophage foam cell formation, potentially contributing to the development of pulmonary fibrosis.
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Affiliation(s)
- Alessandro Venosa
- Department of Pharmacology and Toxicology, Ernest Mario School of Pharmacy
| | - Ley Cody Smith
- Department of Pharmacology and Toxicology, Ernest Mario School of Pharmacy
| | - Alexa Murray
- Department of Pharmacology and Toxicology, Ernest Mario School of Pharmacy
| | - Tanvi Banota
- Department of Pharmacology and Toxicology, Ernest Mario School of Pharmacy
| | - Andrew J Gow
- Department of Pharmacology and Toxicology, Ernest Mario School of Pharmacy
| | - Jeffrey D Laskin
- Department of Environmental and Occupational Health, School of Public Health, Rutgers University, Piscataway, New Jersey 08854
| | - Debra L Laskin
- Department of Pharmacology and Toxicology, Ernest Mario School of Pharmacy
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Bonacina F, Pirillo A, Catapano AL, Norata GD. Cholesterol membrane content has a ubiquitous evolutionary function in immune cell activation: the role of HDL. Curr Opin Lipidol 2019; 30:462-469. [PMID: 31577612 DOI: 10.1097/mol.0000000000000642] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
PURPOSE OF REVIEW Cellular cholesterol content influences the structure and function of lipid rafts, plasma membrane microdomains essential for cell signaling and activation. HDL modulate cellular cholesterol efflux, thus limiting cholesterol accumulation and controlling immune cell activation. Aim of this review is to discuss the link between HDL and cellular cholesterol metabolism in immune cells and the therapeutic potential of targeting cholesterol removal from cell membranes. RECENT FINDINGS The inverse relationship between HDL-cholesterol (HDL-C) levels and the risk of cardiovascular disease has been recently challenged by observations linking elevated levels of HDL-C with increased risk of all-cause mortality, infections and autoimmune diseases, paralleled by the failure of clinical trials with HDL-C-raising therapies. These findings suggest that improving HDL function might be more important than merely raising HDL-C levels. New approaches aimed at increasing the ability of HDL to remove cellular cholesterol have been assessed for their effect on immune cells, and the results have suggested that this could be a new effective approach. SUMMARY Cholesterol removal from plasma membrane by different means affects the activity of immune cells, suggesting that approaches aimed at increasing the ability of HDL to mobilize cholesterol from cells would represent the next step in HDL biology.
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Affiliation(s)
- Fabrizia Bonacina
- Department of Pharmacological and Biomolecular Sciences, University of Milan
| | - Angela Pirillo
- Center for the Study of Atherosclerosis, E. Bassini Hospital
- IRCCS MultiMedica, Milan, Italy
| | - Alberico L Catapano
- Department of Pharmacological and Biomolecular Sciences, University of Milan
- IRCCS MultiMedica, Milan, Italy
| | - Giuseppe D Norata
- Department of Pharmacological and Biomolecular Sciences, University of Milan
- Center for the Study of Atherosclerosis, E. Bassini Hospital
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66
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Ruiz F, Vigne S, Pot C. Resolution of inflammation during multiple sclerosis. Semin Immunopathol 2019; 41:711-726. [PMID: 31732775 PMCID: PMC6881249 DOI: 10.1007/s00281-019-00765-0] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2019] [Accepted: 09/27/2019] [Indexed: 12/14/2022]
Abstract
Multiple sclerosis (MS) is a frequent autoimmune demyelinating disease of the central nervous system (CNS). There are three clinical forms described: relapsing-remitting multiple sclerosis (RRMS), the most common initial presentation (85%) among which, if not treated, about half will transform, into the secondary progressive multiple sclerosis (SPMS) and the primary progressive MS (PPMS) (15%) that is directly progressive without superimposed clinical relapses. Inflammation is present in all subsets of MS. The relapsing/remitting form could represent itself a particular interest for the study of inflammation resolution even though it remains incomplete in MS. Successful resolution of acute inflammation is a highly regulated process and dependent on mechanisms engaged early in the inflammatory response that are scarcely studied in MS. Moreover, recent classes of disease-modifying treatment (DMTs) that are effective against RRMS act by re-establishing the inflammatory imbalance, taking advantage of the pre-existing endogenous suppressor. In this review, we will discuss the active role of regulatory immune cells in inflammation resolution as well as the role of tissue and non-hematopoietic cells as contributors to inflammation resolution. Finally, we will explore how DMTs, more specifically induction therapies, impact the resolution of inflammation during MS.
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Affiliation(s)
- F Ruiz
- Laboratories of Neuroimmunology, Neuroscience Research Center and Service of Neurology, Department of Clinical Neurosciences, Lausanne University Hospital and University of Lausanne, Chemin des Boveresses 155, 1066, Epalinges, Switzerland
| | - S Vigne
- Laboratories of Neuroimmunology, Neuroscience Research Center and Service of Neurology, Department of Clinical Neurosciences, Lausanne University Hospital and University of Lausanne, Chemin des Boveresses 155, 1066, Epalinges, Switzerland
| | - C Pot
- Laboratories of Neuroimmunology, Neuroscience Research Center and Service of Neurology, Department of Clinical Neurosciences, Lausanne University Hospital and University of Lausanne, Chemin des Boveresses 155, 1066, Epalinges, Switzerland.
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67
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Chang WH, Lai AG. The pan‐cancer mutational landscape of the PPAR pathway reveals universal patterns of dysregulated metabolism and interactions with tumor immunity and hypoxia. Ann N Y Acad Sci 2019; 1448:65-82. [DOI: 10.1111/nyas.14170] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2019] [Revised: 05/20/2019] [Accepted: 05/24/2019] [Indexed: 12/13/2022]
Affiliation(s)
- Wai Hoong Chang
- Nuffield Department of MedicineUniversity of Oxford Oxford United Kingdom
| | - Alvina G. Lai
- Nuffield Department of MedicineUniversity of Oxford Oxford United Kingdom
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Smith DG, Martinelli R, Besra GS, Illarionov PA, Szatmari I, Brazda P, Allen MA, Xu W, Wang X, Nagy L, Dowell RD, Rook GAW, Rosa Brunet L, Lowry CA. Identification and characterization of a novel anti-inflammatory lipid isolated from Mycobacterium vaccae, a soil-derived bacterium with immunoregulatory and stress resilience properties. Psychopharmacology (Berl) 2019; 236:1653-1670. [PMID: 31119329 PMCID: PMC6626661 DOI: 10.1007/s00213-019-05253-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/06/2018] [Accepted: 04/22/2019] [Indexed: 12/14/2022]
Abstract
RATIONALE Mycobacterium vaccae (NCTC 11659) is an environmental saprophytic bacterium with anti-inflammatory, immunoregulatory, and stress resilience properties. Previous studies have shown that whole, heat-killed preparations of M. vaccae prevent allergic airway inflammation in a murine model of allergic asthma. Recent studies also demonstrate that immunization with M. vaccae prevents stress-induced exaggeration of proinflammatory cytokine secretion from mesenteric lymph node cells stimulated ex vivo, prevents stress-induced exaggeration of chemically induced colitis in a model of inflammatory bowel disease, and prevents stress-induced anxiety-like defensive behavioral responses. Furthermore, immunization with M. vaccae induces anti-inflammatory responses in the brain and prevents stress-induced exaggeration of microglial priming. However, the molecular mechanisms underlying anti-inflammatory effects of M. vaccae are not known. OBJECTIVES Our objective was to identify and characterize novel anti-inflammatory molecules from M. vaccae NCTC 11659. METHODS We have purified and identified a unique anti-inflammatory triglyceride, 1,2,3-tri [Z-10-hexadecenoyl] glycerol, from M. vaccae and evaluated its effects in freshly isolated murine peritoneal macrophages. RESULTS The free fatty acid form of 1,2,3-tri [Z-10-hexadecenoyl] glycerol, 10(Z)-hexadecenoic acid, decreased lipopolysaccharide-stimulated secretion of the proinflammatory cytokine IL-6 ex vivo. Meanwhile, next-generation RNA sequencing revealed that pretreatment with 10(Z)-hexadecenoic acid upregulated genes associated with peroxisome proliferator-activated receptor alpha (PPARα) signaling in lipopolysaccharide-stimulated macrophages, in association with a broad transcriptional repression of inflammatory markers. We confirmed using luciferase-based transfection assays that 10(Z)-hexadecenoic acid activated PPARα signaling, but not PPARγ, PPARδ, or retinoic acid receptor (RAR) α signaling. The effects of 10(Z)-hexadecenoic acid on lipopolysaccharide-stimulated secretion of IL-6 were prevented by PPARα antagonists and absent in PPARα-deficient mice. CONCLUSION Future studies should evaluate the effects of 10(Z)-hexadecenoic acid on stress-induced exaggeration of peripheral inflammatory signaling, central neuroinflammatory signaling, and anxiety- and fear-related defensive behavioral responses.
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Affiliation(s)
- David G Smith
- Department of Chemistry and Biochemistry, University of Colorado Boulder, Boulder, CO, 80309, USA.
- Department of Pathology, Anatomy, and Cellular Biology, Thomas Jefferson University, Philadelphia, PA, 19107, USA.
| | - Roberta Martinelli
- Centre for Clinical Microbiology, Department of Infection, UCL (University College London), London, WC1E 6BT, UK
- Merck Research Laboratories, MSD, Kenilworth, NJ, USA
| | - Gurdyal S Besra
- School of Bioscience, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Petr A Illarionov
- School of Bioscience, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Istvan Szatmari
- Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Debrecen, Egyetem tér, 1, Debrecen, 4032, Hungary
| | - Peter Brazda
- Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Debrecen, Egyetem tér, 1, Debrecen, 4032, Hungary
| | - Mary A Allen
- Department of Molecular, Cellular, and Developmental Biology, University of Colorado Boulder, Boulder, CO, 80309, USA
- BioFrontiers Institute, University of Colorado Boulder, Boulder, CO, 80303, USA
| | - Wenqing Xu
- Department of Chemistry and Biochemistry, University of Colorado Boulder, Boulder, CO, 80309, USA
| | - Xiang Wang
- Department of Chemistry and Biochemistry, University of Colorado Boulder, Boulder, CO, 80309, USA
| | - László Nagy
- Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Debrecen, Egyetem tér, 1, Debrecen, 4032, Hungary
- MTA-DE "Lendület" Immunogenomics Research Group, University of Debrecen, Egyetem tér, 1, Debrecen, 4012, Hungary
- Department of Medicine, Johns Hopkins University, Johns Hopkins All Children's Hospital, Saint Petersburg, FL, 33701, USA
| | - Robin D Dowell
- Department of Molecular, Cellular, and Developmental Biology, University of Colorado Boulder, Boulder, CO, 80309, USA
- BioFrontiers Institute, University of Colorado Boulder, Boulder, CO, 80303, USA
| | - Graham A W Rook
- Centre for Clinical Microbiology, Department of Infection, UCL (University College London), London, WC1E 6BT, UK
| | - Laura Rosa Brunet
- Centre for Clinical Microbiology, Department of Infection, UCL (University College London), London, WC1E 6BT, UK
| | - Christopher A Lowry
- Department of Integrative Physiology, Center for Neuroscience, and Center for Microbial Exploration, University of Colorado Boulder, Boulder, CO, 80309, USA.
- inVIVO Planetary Health, of the Worldwide Universities Network (WUN), West New York, NJ, 07093, USA.
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Subramanian C, Frank MW, Batte JL, Whaley SG, Rock CO. Oleate hydratase from Staphylococcus aureus protects against palmitoleic acid, the major antimicrobial fatty acid produced by mammalian skin. J Biol Chem 2019; 294:9285-9294. [PMID: 31018965 DOI: 10.1074/jbc.ra119.008439] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Revised: 04/11/2019] [Indexed: 01/01/2023] Open
Abstract
Oleate hydratases (OhyAs) belong to a large family of bacterial proteins catalyzing the hydration or isomerization of double bonds in unsaturated fatty acids. A Staphylococcus aureus gene (Sa0102) is predicted to encode an OhyA. Here, we recombinantly expressed and purified SaOhyA and found that it forms a homodimer that requires FAD for activity. SaOhyA hydrates only unsaturated fatty acids containing cis-9 double bonds, but not fatty acids with trans-9 double bonds or cis double bonds at other positions. SaOhyA products were not detected in S. aureus phospholipids and were released into the growth medium. S. aureus does not synthesize unsaturated fatty acids, and the SaOhyA substrates are derived from infection sites. Palmitoleate (16:1(9Z)) is a major mammalian skin-produced antimicrobial fatty acid that protects against S. aureus infection, and we observed that it is an SaOhyA substrate and that its hydroxylated derivative is not antimicrobial. Treatment of S. aureus with 24 μm 16:1(9Z) immediately arrested growth, followed by growth resumption after a lag period of 2 h. The ΔohyA mutant strain did not recover from the 16:1(9Z) challenge, and increasing SaOhyA expression using a plasmid system prevented the initial growth arrest. Challenging S. aureus with sapienic acid (16:1(6Z)), an antimicrobial fatty acid produced only by human skin, arrested growth without recovery in WT, ΔohyA, and SaOhyA-overexpressing strains. We conclude that SaOhyA protects S. aureus from palmitoleic acid, the antimicrobial unsaturated fatty acid produced by most mammals, and that sapienic acid, uniquely produced by humans, counters the OhyA-dependent bacterial defense mechanism.
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Affiliation(s)
- Chitra Subramanian
- From the Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, Tennessee 38105
| | - Matthew W Frank
- From the Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, Tennessee 38105
| | - Justin L Batte
- From the Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, Tennessee 38105
| | - Sarah G Whaley
- From the Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, Tennessee 38105
| | - Charles O Rock
- From the Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, Tennessee 38105
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Grun LK, Teixeira NDR, Mengden LV, de Bastiani MA, Parisi MM, Bortolin R, Lavandoski P, Pierdoná V, Alves LB, Moreira JCF, Mottin CC, Jones MH, Klamt F, Padoin AV, Guma FCR, Barbé-Tuana FM. TRF1 as a major contributor for telomeres' shortening in the context of obesity. Free Radic Biol Med 2018; 129:286-295. [PMID: 30268887 DOI: 10.1016/j.freeradbiomed.2018.09.039] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/06/2018] [Accepted: 09/24/2018] [Indexed: 01/02/2023]
Abstract
Obesity is a prevalent multifactorial chronic disorder characterized by metabolic dysregulation. Sustained pro-oxidative mediators trigger harmful consequences that reflect at systemic level and contribute for the establishment of a premature senescent phenotype associated with macromolecular damage (DNA, protein, and lipids). Telomeres are structures that protect chromosome ends and are associated with a six-protein complex called the shelterin complex and subject to regulation. Under pro-oxidant conditions, telomere attrition and the altered expression of the shelterin proteins are central for the establishment of many pathophysiological conditions such as obesity. Thus, considering that individuals with obesity display a systemic oxidative stress profile that may compromise the telomeres length or its regulation, the aim of this study was to investigate telomere homeostasis in patients with obesity and explore broad/systemic associations with the expression of shelterin genes and the plasma redox state. We performed a cross-sectional study in 39 patients with obesity and 27 eutrophic subjects. Telomere length (T/S ratio) and gene expression of shelterin components were performed in peripheral blood mononuclear cells by qPCR. The oxidative damage (lipid peroxidation and protein carbonylation) and non-enzymatic antioxidant system (total radical-trapping antioxidant potential/reactivity, sulfhydryl and GSH content) were evaluated in plasma. Our results demonstrate that independently of comorbidities, individuals with obesity had significantly shorter telomeres, augmented expression of negative regulators of the shelterin complex, increased lipid peroxidation and higher oxidized protein levels associated with increased non-enzymatic antioxidant defenses. Principal component analysis revealed TRF1 as a major contributor for firstly telomeres shortening. In conclusion, our study is first showing a comprehensive analysis of telomeres in the context of obesity, associated with dysregulation of the shelterin components that was partially explained by TRF1 upregulation that could not be reversed by the observed adaptive non-enzymatic antioxidant response.
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Affiliation(s)
- Lucas Kich Grun
- Postgraduate Program: Biochemistry, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil; Group of Inflammation and Cellular Senescence and Laboratory of Molecular Biology and Bioinformatics, Department of Biochemistry/ICBS, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil
| | - Nevton da Rosa Teixeira
- Postgraduate Program: Biochemistry, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil; Group of Inflammation and Cellular Senescence and Laboratory of Molecular Biology and Bioinformatics, Department of Biochemistry/ICBS, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil
| | - Lúcia von Mengden
- Postgraduate Program: Biochemistry, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil; Laboratory of Cellular Biochemistry, Department of Biochemistry/ICBS, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil
| | - Marco Antônio de Bastiani
- Postgraduate Program: Biochemistry, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil; Laboratory of Cellular Biochemistry, Department of Biochemistry/ICBS, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil
| | - Mariana Migliorini Parisi
- Interdisciplinary Group of Health (GIS), Center of Education and Research of the Institute of Cardiology of Cruz Alta, University of Cruz Alta (UNICRUZ), Cruz Alta, Brazil
| | - Rafael Bortolin
- Department of Civil and Environmental Engineering, Universidad de la Costa, Barranquilla, Atlántico, Colombia
| | - Patrícia Lavandoski
- Postgraduate Program: Biochemistry, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil; Group of Inflammation and Cellular Senescence and Laboratory of Molecular Biology and Bioinformatics, Department of Biochemistry/ICBS, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil
| | - Vinícius Pierdoná
- Postgraduate Program: Biochemistry, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil; Group of Inflammation and Cellular Senescence and Laboratory of Molecular Biology and Bioinformatics, Department of Biochemistry/ICBS, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil
| | - Letícia Biscaino Alves
- Center of Obesity and Metabolic Syndrome, São Lucas Hospital at Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS) and Postgraduate Program: Medicine and Health Sciences, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Porto Alegre, RS, Brazil
| | - José Cláudio Fonseca Moreira
- Postgraduate Program: Biochemistry, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil; Laboratory of Cellular Stress, Department of Biochemistry/ICBS, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil
| | - Cláudio Corá Mottin
- Center of Obesity and Metabolic Syndrome, São Lucas Hospital at Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS) and Postgraduate Program: Medicine and Health Sciences, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Porto Alegre, RS, Brazil; Laboratory of Respiratory Physiology, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), School of Medicine, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Porto Alegre, RS, Brazil
| | - Marcus Herbert Jones
- Laboratory of Respiratory Physiology, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), School of Medicine, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Porto Alegre, RS, Brazil
| | - Fábio Klamt
- Postgraduate Program: Biochemistry, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil; Laboratory of Cellular Biochemistry, Department of Biochemistry/ICBS, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil
| | - Alexandre Vontobel Padoin
- Center of Obesity and Metabolic Syndrome, São Lucas Hospital at Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS) and Postgraduate Program: Medicine and Health Sciences, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Porto Alegre, RS, Brazil
| | - Fátima Costa Rodrigues Guma
- Postgraduate Program: Biochemistry, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil; Group of Inflammation and Cellular Senescence and Laboratory of Molecular Biology and Bioinformatics, Department of Biochemistry/ICBS, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil; Laboratory of Biochemistry and Cellular Biology of Lipids, Department of Biochemistry/ICBS, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil
| | - Florencia María Barbé-Tuana
- Postgraduate Program: Biochemistry, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil; Group of Inflammation and Cellular Senescence and Laboratory of Molecular Biology and Bioinformatics, Department of Biochemistry/ICBS, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil; Postgraduate Program in Cellular and Molecular Biology, School of Sciences, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Porto Alegre, RS, Brazil.
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Nessaibia I, Fouache A, Lobaccaro JMA, Tahraoui A, Trousson A, Souidi M. Stress as an immunomodulator: liver X receptors maybe the answer. Inflammopharmacology 2018; 27:15-25. [PMID: 30467620 DOI: 10.1007/s10787-018-0546-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2018] [Accepted: 11/03/2018] [Indexed: 02/07/2023]
Abstract
Stress is a reflex response, both psychological and physiological, of the body to a difficult situation that requires adaptation. Stress is at the intersection of the objective event and the subjective event. The physiological mechanisms involved in chronic stress are numerous and can contribute to a wide variety of disorders, in all systems including the immune system. Stress modifies the Th1/Th2 balance via the HPA axis and a set of immune mediators. This will make the body more vulnerable to external infections in a scientific way while others claim the opposite, stress could be considered immune stimulatory. The development of synthetic LXR ligands such as T0901317 and GW3965 as well as an understanding of the direct involvement of these receptors in the regulation of proopiomelanocortin (POMC) gene expression and indirectly by producing a variety of cytokines in a stressor response, will open in the near future new therapeutic methods against the undesirable effects of stress on the behavior of the immune system.
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Affiliation(s)
- Issam Nessaibia
- CNRS UMR 6293, Laboratory GReD, INSERM U 1103, Clermont Auvergne University, 28 Place Henri Dunant, 63000, Clermont-Ferrand, France.
- Laboratory of Applied Neuro-Endocrinology, Department of Biology, Badji-Mokhtar University, Annaba, Algeria.
| | - Allan Fouache
- CNRS UMR 6293, Laboratory GReD, INSERM U 1103, Clermont Auvergne University, 28 Place Henri Dunant, 63000, Clermont-Ferrand, France
| | - Jean-Marc A Lobaccaro
- CNRS UMR 6293, Laboratory GReD, INSERM U 1103, Clermont Auvergne University, 28 Place Henri Dunant, 63000, Clermont-Ferrand, France
| | - Abdelkrim Tahraoui
- Laboratory of Applied Neuro-Endocrinology, Department of Biology, Badji-Mokhtar University, Annaba, Algeria
| | - Amalia Trousson
- CNRS UMR 6293, Laboratory GReD, INSERM U 1103, Clermont Auvergne University, 28 Place Henri Dunant, 63000, Clermont-Ferrand, France
| | - Maâmar Souidi
- Institut de radioprotection et de sûreté nucléaire, Direction de la radioprotection de l'homme, IRSN, Fontenay-aux-Roses Cedex, France
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Grajchen E, Hendriks JJA, Bogie JFJ. The physiology of foamy phagocytes in multiple sclerosis. Acta Neuropathol Commun 2018; 6:124. [PMID: 30454040 PMCID: PMC6240956 DOI: 10.1186/s40478-018-0628-8] [Citation(s) in RCA: 86] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2018] [Accepted: 11/02/2018] [Indexed: 12/15/2022] Open
Abstract
Multiple sclerosis (MS) is a chronic disease of the central nervous system characterized by massive infiltration of immune cells, demyelination, and axonal loss. Active MS lesions mainly consist of macrophages and microglia containing abundant intracellular myelin remnants. Initial studies showed that these foamy phagocytes primarily promote MS disease progression by internalizing myelin debris, presenting brain-derived autoantigens, and adopting an inflammatory phenotype. However, more recent studies indicate that phagocytes can also adopt a beneficial phenotype upon myelin internalization. In this review, we summarize and discuss the current knowledge on the spatiotemporal physiology of foamy phagocytes in MS lesions, and elaborate on extrinsic and intrinsic factors regulating their behavior. In addition, we discuss and link the physiology of myelin-containing phagocytes to that of foamy macrophages in other disorders such atherosclerosis.
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Affiliation(s)
- Elien Grajchen
- Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium/School of Life Sciences, Transnationale Universiteit Limburg, Diepenbeek, Belgium
| | - Jerome J A Hendriks
- Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium/School of Life Sciences, Transnationale Universiteit Limburg, Diepenbeek, Belgium
| | - Jeroen F J Bogie
- Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium/School of Life Sciences, Transnationale Universiteit Limburg, Diepenbeek, Belgium.
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73
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DEL-1 promotes macrophage efferocytosis and clearance of inflammation. Nat Immunol 2018; 20:40-49. [PMID: 30455459 PMCID: PMC6291356 DOI: 10.1038/s41590-018-0249-1] [Citation(s) in RCA: 172] [Impact Index Per Article: 28.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2018] [Accepted: 09/26/2018] [Indexed: 12/12/2022]
Abstract
Resolution of inflammation is essential for tissue homeostasis and a promising approach to inflammatory disorders. Here we found that DEL-1, a secreted protein inhibiting leukocyte-endothelial adhesion and inflammation initiation, also functions as a non-redundant downstream effector in inflammation clearance. In human and murine periodontitis, waning of inflammation correlated with DEL-1 upregulation, whereas resolution of experimental periodontitis failed in DEL-1 deficiency. This concept was mechanistically substantiated in acute monosodium urate crystal-induced inflammation, where the pro-resolution function of DEL-1 was attributed to effective apoptotic neutrophil clearance (efferocytosis). DEL-1-mediated efferocytosis induced liver-X-receptor-dependent macrophage reprogramming to pro-resolving phenotype and was required for optimal production of at least certain specific pro-resolving mediators. Experiments in transgenic mice with cell-specific overexpression of DEL-1 linked its anti-leukocyte recruitment action to endothelial-derived DEL-1 and its efferocytic/pro-resolving action to macrophage-derived DEL-1. Thus, the compartmentalized expression of DEL-1 facilitates distinct homeostatic functions in an appropriate context that can be harnessed therapeutically.
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74
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Ferrara-Romeo I, Martínez P, Blasco MA. Mice lacking RAP1 show early onset and higher rates of DEN-induced hepatocellular carcinomas in female mice. PLoS One 2018; 13:e0204909. [PMID: 30307978 PMCID: PMC6187989 DOI: 10.1371/journal.pone.0204909] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Accepted: 09/17/2018] [Indexed: 02/07/2023] Open
Abstract
RAP1, a component of the telomere-protective shelterin complex, has been shown to have both telomeric and non-telomeric roles. In the liver, RAP1 is involved in the regulation of metabolic transcriptional programs. RAP1-deficient mice develop obesity and hepatic steatosis, these phenotypes being more severe in females than in males. As hepatic steatosis and obesity have been related to increased liver cancer in mice and humans, we set out to address whether RAP1 deficiency resulted in increased liver cancer upon chemical liver carcinogenesis. We found that Rap1-/- females were more susceptible to DEN-induced liver damage and hepatocellular carcinoma (HCC). DEN-treated Rap1-/- female livers showed an earlier onset of both premalignant and malignant liver lesions, which were characterized by increased abundance of γH2AX-positive cells, increased proliferation and shorter telomeres. These findings highlight an important role for RAP1 in protection from liver damage and liver cancer.
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Affiliation(s)
- Iole Ferrara-Romeo
- Telomeres and Telomerase Group, Molecular Oncology Program, Spanish National Cancer Centre (CNIO), Melchor Fernández Almagro 3, Madrid, Spain
| | - Paula Martínez
- Telomeres and Telomerase Group, Molecular Oncology Program, Spanish National Cancer Centre (CNIO), Melchor Fernández Almagro 3, Madrid, Spain
| | - Maria A. Blasco
- Telomeres and Telomerase Group, Molecular Oncology Program, Spanish National Cancer Centre (CNIO), Melchor Fernández Almagro 3, Madrid, Spain
- * E-mail:
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75
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Carone C, Olivani A, Dalla Valle R, Manuguerra R, Silini EM, Trenti T, Missale G, Cariani E. Immune Gene Expression Profile in Hepatocellular Carcinoma and Surrounding Tissue Predicts Time to Tumor Recurrence. Liver Cancer 2018; 7:277-294. [PMID: 30319985 PMCID: PMC6167723 DOI: 10.1159/000486764] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/25/2017] [Accepted: 01/06/2018] [Indexed: 02/04/2023] Open
Abstract
BACKGROUND The antitumor immune response may play a major role in the clinical outcome of hepatocellular carcinoma (HCC). We characterized the liver immune microenvironment by direct hybridization of RNA extracted from HCC and nontumorous tissues. METHODS RNA was extracted from frozen liver tissue samples of HCC (T; n = 30) and nontumorous tissues (NT; n = 33) obtained from 38 patients. Matched samples were available for 25 patients. The immune gene expression profile was analyzed with the nCounter GX Human Immunology v2 system (NanoString Technologies), which detects the expression levels of 579 immune response-related genes simultaneously. RESULTS Since the immune gene expression profile of T and NT tissues was significantly different, the prognostic relevance of the liver immune microenvironment was evaluated in the T and NT samples separately. Unsupervised clustering detected two main clusters of immune gene expression both in T and in NT liver samples. In both cases, the expression clusters identified groups of patients with a significantly different median time to HCC recurrence (TTR) but similar overall survival. Based on T tissue, two groups with median TTR of 19 and 127 months, respectively, were detected (p < 0.005). Expression of genes related to T-cell activation was associated with longer TTR. The analysis of NT tissue discriminated subsets of patients with median TTR of 22 and 68 months (p < 0.05). In contrast to T tissue, a predominant inflammatory immune environment was associated with shorter TTR. CONCLUSIONS Immune gene expression profiles predictive of TTR could be identified both in HCC and in adjacent cirrhotic tissues. Longer TTR was associated with overexpression in T tissue and downregulation in NT tissue of the immune response and of inflammation-related genes.
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Affiliation(s)
- Chiara Carone
- Toxicology and Advanced Diagnostics, Ospedale S. Agostino-Estense, Modena, Italy
| | - Andrea Olivani
- U.O. Infectious Diseases and Hepatology, Azienda Ospedaliero-Universitaria di Parma, Parma, Italy
| | | | - Roberta Manuguerra
- Pathology Section, Department of Pathology and Laboratory Medicine, University of Parma, Parma, Italy
| | - Enrico Maria Silini
- Pathology Section, Department of Pathology and Laboratory Medicine, University of Parma, Parma, Italy
| | - Tommaso Trenti
- Toxicology and Advanced Diagnostics, Ospedale S. Agostino-Estense, Modena, Italy
| | - Gabriele Missale
- U.O. Infectious Diseases and Hepatology, Azienda Ospedaliero-Universitaria di Parma, Parma, Italy
| | - Elisabetta Cariani
- Toxicology and Advanced Diagnostics, Ospedale S. Agostino-Estense, Modena, Italy,*Elisabetta Cariani, Toxicology and Advanced Diagnostics, Ospedale S. Agostino-Estense, via Giardini 1355, IT-41126 Modena (Italy), E-Mail
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76
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Abstract
Liver X receptors α and β (LXRα and LXRβ) are nuclear receptors with pivotal roles in the transcriptional control of lipid metabolism. Transcriptional activity of LXRs is induced in response to elevated cellular levels of cholesterol. LXRs bind to and regulate the expression of genes that encode proteins involved in cholesterol absorption, transport, efflux, excretion and conversion to bile acids. The coordinated, tissue-specific actions of the LXR pathway maintain systemic cholesterol homeostasis and regulate immune and inflammatory responses. LXRs also regulate fatty acid metabolism by controlling the lipogenic transcription factor sterol regulatory element-binding protein 1c and regulate genes that encode proteins involved in fatty acid elongation and desaturation. LXRs exert important effects on the metabolism of phospholipids, which, along with cholesterol, are major constituents of cellular membranes. LXR activation preferentially drives the incorporation of polyunsaturated fatty acids into phospholipids by inducing transcription of the remodelling enzyme lysophosphatidylcholine acyltransferase 3. The ability of the LXR pathway to couple cellular sterol levels with the saturation of fatty acids in membrane phospholipids has implications for several physiological processes, including lipoprotein production, dietary lipid absorption and intestinal stem cell proliferation. Understanding how LXRs regulate membrane composition and function might provide new therapeutic insight into diseases associated with dysregulated lipid metabolism, including atherosclerosis, diabetes mellitus and cancer.
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Affiliation(s)
- Bo Wang
- Department of Pathology and Laboratory Medicine, Molecular Biology Institute, David Geffen School of Medicine, University of California, Los Angeles, CA, USA
| | - Peter Tontonoz
- Department of Pathology and Laboratory Medicine, Molecular Biology Institute, David Geffen School of Medicine, University of California, Los Angeles, CA, USA.
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77
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Gaber T, Chen Y, Krauß PL, Buttgereit F. Metabolism of T Lymphocytes in Health and Disease. INTERNATIONAL REVIEW OF CELL AND MOLECULAR BIOLOGY 2018; 342:95-148. [PMID: 30635095 DOI: 10.1016/bs.ircmb.2018.06.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Adaptive immune responses that occur in infection, cancer, and autoimmune as well as allergic diseases involve the participation of T cells. T cells travel throughout the body searching for antigens, which are recognized via the major histocompatibility complexes. In the healthy organism, these T cells maintain metabolic quiescence until they encounter a potentially cognate antigen. Once activated, e.g., during an infection or tissue damage, T cells switch their metabolic program to gain energy and building blocks to maintain cellular homeostasis and to fulfill their specific immune functions involving clonal expansion and/or differentiation into effector and memory T cells to ultimately ensure host survival. Thus, differences in metabolism in healthy and pathogenic T cells provide an explanation for dysfunctionality of T-cell responses in metabolic disorders, autoimmunity, and cancer. Here, we summarize current knowledge on T-cell metabolism during the maintenance of homeostasis, activation, and differentiation as well as over the course of time that memory is generated in health and in diseased states such as autoimmunity and cancer.
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Affiliation(s)
- Timo Gaber
- Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin Institute of Health, Department of Rheumatology and Clinical Immunology, Berlin, Germany; German Rheumatism Research Centre (DRFZ) Berlin, a Leibniz Institute, Berlin, Germany
| | - Yuling Chen
- Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin Institute of Health, Department of Rheumatology and Clinical Immunology, Berlin, Germany; German Rheumatism Research Centre (DRFZ) Berlin, a Leibniz Institute, Berlin, Germany
| | - Pierre-Louis Krauß
- Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin Institute of Health, Department of Rheumatology and Clinical Immunology, Berlin, Germany; German Rheumatism Research Centre (DRFZ) Berlin, a Leibniz Institute, Berlin, Germany
| | - Frank Buttgereit
- Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin Institute of Health, Department of Rheumatology and Clinical Immunology, Berlin, Germany; German Rheumatism Research Centre (DRFZ) Berlin, a Leibniz Institute, Berlin, Germany
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78
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Metabolic Dysfunction and Peroxisome Proliferator-Activated Receptors (PPAR) in Multiple Sclerosis. Int J Mol Sci 2018; 19:ijms19061639. [PMID: 29865151 PMCID: PMC6032172 DOI: 10.3390/ijms19061639] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2018] [Revised: 05/27/2018] [Accepted: 05/28/2018] [Indexed: 02/06/2023] Open
Abstract
Multiple sclerosis (MS) is an inflammatory and neurodegenerative disease of the central nervous system (CNS) probably caused, in most cases, by the interaction of genetic and environmental factors. This review first summarizes some clinical, epidemiological and pathological characteristics of MS. Then, the involvement of biochemical pathways is discussed in the development and repair of the CNS lesions and the immune dysfunction in the disease. Finally, the potential roles of peroxisome proliferator-activated receptors (PPAR) in MS are discussed. It is suggested that metabolic mechanisms modulated by PPAR provide a window to integrate the systemic and neurological events underlying the pathogenesis of the disease. In conclusion, the reviewed data highlight molecular avenues of understanding MS that may open new targets for improved therapies and preventive strategies for the disease.
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79
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Castro-Alves VC, Nascimento JROD. α- and β-d-Glucans from the edible mushroom Pleurotus albidus differentially regulate lipid-induced inflammation and foam cell formation in human macrophage-like THP-1 cells. Int J Biol Macromol 2018; 111:1222-1228. [DOI: 10.1016/j.ijbiomac.2018.01.131] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Revised: 01/10/2018] [Accepted: 01/19/2018] [Indexed: 01/13/2023]
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80
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Liver X Receptor Nuclear Receptors Are Transcriptional Regulators of Dendritic Cell Chemotaxis. Mol Cell Biol 2018; 38:MCB.00534-17. [PMID: 29507185 DOI: 10.1128/mcb.00534-17] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2017] [Accepted: 02/10/2018] [Indexed: 12/20/2022] Open
Abstract
The liver X receptors (LXRs) are ligand-activated nuclear receptors with established roles in the maintenance of lipid homeostasis in multiple tissues. LXRs exert additional biological functions as negative regulators of inflammation, particularly in macrophages. However, the transcriptional responses controlled by LXRs in other myeloid cells, such as dendritic cells (DCs), are still poorly understood. Here we used gain- and loss-of-function models to characterize the impact of LXR deficiency on DC activation programs. Our results identified an LXR-dependent pathway that is important for DC chemotaxis. LXR-deficient mature DCs are defective in stimulus-induced migration in vitro and in vivo Mechanistically, we show that LXRs facilitate DC chemotactic signaling by regulating the expression of CD38, an ectoenzyme important for leukocyte trafficking. Pharmacological or genetic inactivation of CD38 activity abolished the LXR-dependent induction of DC chemotaxis. Using the low-density lipoprotein receptor-deficient (LDLR-/-) LDLR-/- mouse model of atherosclerosis, we also demonstrated that hematopoietic CD38 expression is important for the accumulation of lipid-laden myeloid cells in lesions, suggesting that CD38 is a key factor in leukocyte migration during atherogenesis. Collectively, our results demonstrate that LXRs are required for the efficient emigration of DCs in response to chemotactic signals during inflammation.
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81
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Hiebl V, Ladurner A, Latkolik S, Dirsch VM. Natural products as modulators of the nuclear receptors and metabolic sensors LXR, FXR and RXR. Biotechnol Adv 2018; 36:1657-1698. [PMID: 29548878 DOI: 10.1016/j.biotechadv.2018.03.003] [Citation(s) in RCA: 88] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2017] [Revised: 03/02/2018] [Accepted: 03/08/2018] [Indexed: 01/25/2023]
Abstract
Nuclear receptors (NRs) represent attractive targets for the treatment of metabolic syndrome-related diseases. In addition, natural products are an interesting pool of potential ligands since they have been refined under evolutionary pressure to interact with proteins or other biological targets. This review aims to briefly summarize current basic knowledge regarding the liver X (LXR) and farnesoid X receptors (FXR) that form permissive heterodimers with retinoid X receptors (RXR). Natural product-based ligands for these receptors are summarized and the potential of LXR, FXR and RXR as targets in precision medicine is discussed.
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Affiliation(s)
- Verena Hiebl
- University of Vienna, Department of Pharmacognosy, Althanstrasse 14, 1090 Vienna, Austria
| | - Angela Ladurner
- University of Vienna, Department of Pharmacognosy, Althanstrasse 14, 1090 Vienna, Austria.
| | - Simone Latkolik
- University of Vienna, Department of Pharmacognosy, Althanstrasse 14, 1090 Vienna, Austria
| | - Verena M Dirsch
- University of Vienna, Department of Pharmacognosy, Althanstrasse 14, 1090 Vienna, Austria
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82
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Poirot M, Silvente-Poirot S. The tumor-suppressor cholesterol metabolite, dendrogenin A, is a new class of LXR modulator activating lethal autophagy in cancers. Biochem Pharmacol 2018; 153:75-81. [PMID: 29409832 DOI: 10.1016/j.bcp.2018.01.046] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2017] [Accepted: 01/29/2018] [Indexed: 12/31/2022]
Abstract
Dendrogenin A (DDA) is a mammalian cholesterol metabolite recently identified that displays tumor suppressor properties. The discovery of DDA has revealed the existence in mammals of a new metabolic branch in the cholesterol pathway centered on 5,6α-epoxycholesterol and bridging cholesterol metabolism with histamine metabolism. Metabolic studies showed a drop in DDA levels in cancer cells and tumors compared to normal cells, suggesting a link between DDA metabolism deregulation and oncogenesis. Importantly, complementation of cancer cells with DDA induced 1) cancer cell re-differentiation, 2) blockade of 6-oxo-cholestan-3β,5α-diol (OCDO) production, an endogenous tumor promoter and 3) lethal autophagy in tumors. Importantly, by binding the liver X receptor (LXR), DDA activates the expression of genes controlling autophagy. These genes include NR4A1, NR4A3, LC3 and TFEB. The canonical LXR ligands 22(R)hydroxycholesterol, TO901317 and GW3965 did not induce these effects indicating that DDA delineates a new class of selective LXR modulator (SLiM). The induction of lethal autophagy by DDA was associated with the accumulation in cancer cells of lysosomes and of the pro-lysosomal cholesterol precursor zymostenol due to the inhibition of the 3β-hydroxysteroid-Δ8Δ7-isomerase enzyme (D8D7I). The anti-cancer efficacy of DDA was established on different mouse and human cancers such as breast cancers, melanoma and acute myeloid leukemia, including patient derived xenografts, and did not discriminate bulk cancer cells from cancer cell progenitors. Together these data highlight that the mammalian metabolite DDA is a promising anticancer compound with a broad range of anticancer applications. In addition, DDA and LXR are new actors in the transcriptional control of autophagy and DDA being a "first in line" driver of lethal autophagy in cancers via the LXR.
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Affiliation(s)
- Marc Poirot
- Team "Cholesterol Metabolism and Therapeutic Innovations", Cancer Research Center of Toulouse, UMR 1037 INSERM-University of Toulouse, Toulouse, France; Cancer Research Center of Toulouse, UMR 1037 INSERM-University of Toulouse, Toulouse, France.
| | - Sandrine Silvente-Poirot
- Team "Cholesterol Metabolism and Therapeutic Innovations", Cancer Research Center of Toulouse, UMR 1037 INSERM-University of Toulouse, Toulouse, France; Cancer Research Center of Toulouse, UMR 1037 INSERM-University of Toulouse, Toulouse, France.
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83
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Pioglitazone attenuates aging-related disorders in aged apolipoprotein E deficient mice. Exp Gerontol 2018; 102:101-108. [DOI: 10.1016/j.exger.2017.12.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2017] [Revised: 12/03/2017] [Accepted: 12/04/2017] [Indexed: 01/08/2023]
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84
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Yurdagul A, Doran AC, Cai B, Fredman G, Tabas IA. Mechanisms and Consequences of Defective Efferocytosis in Atherosclerosis. Front Cardiovasc Med 2018. [PMID: 29379788 DOI: 10.3389/fcvm.2017.00086e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Efficient clearance of apoptotic cells, termed efferocytosis, critically regulates normal homeostasis whereas defective uptake of apoptotic cells results in chronic and non-resolving inflammatory diseases, such as advanced atherosclerosis. Monocyte-derived macrophages recruited into developing atherosclerotic lesions initially display efficient efferocytosis and temper inflammatory responses, processes that restrict plaque progression. However, during the course of plaque development, macrophages undergo cellular reprogramming that reduces efferocytic capacity, which results in post-apoptotic necrosis of apoptotic cells and inflammation. Furthermore, defective efferocytosis in advanced atherosclerosis is a major driver of necrotic core formation, which can trigger plaque rupture and acute thrombotic cardiovascular events. In this review, we discuss the molecular and cellular mechanisms that regulate efferocytosis, how efferocytosis promotes the resolution of inflammation, and how defective efferocytosis leads to the formation of clinically dangerous atherosclerotic plaques.
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Affiliation(s)
- Arif Yurdagul
- Department of Medicine, Columbia University, New York, NY, United States.,Department of Pathology and Cell Biology, Columbia University, New York, NY, United States.,Department of Physiology, Columbia University, New York, NY, United States
| | - Amanda C Doran
- Department of Medicine, Columbia University, New York, NY, United States.,Department of Pathology and Cell Biology, Columbia University, New York, NY, United States.,Department of Physiology, Columbia University, New York, NY, United States
| | - Bishuang Cai
- Department of Medicine, Columbia University, New York, NY, United States.,Department of Pathology and Cell Biology, Columbia University, New York, NY, United States.,Department of Physiology, Columbia University, New York, NY, United States
| | - Gabrielle Fredman
- Department of Molecular and Cellular Physiology, Albany Medical College, Albany, NY, United States
| | - Ira A Tabas
- Department of Medicine, Columbia University, New York, NY, United States.,Department of Pathology and Cell Biology, Columbia University, New York, NY, United States.,Department of Physiology, Columbia University, New York, NY, United States
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85
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Yurdagul A, Doran AC, Cai B, Fredman G, Tabas IA. Mechanisms and Consequences of Defective Efferocytosis in Atherosclerosis. Front Cardiovasc Med 2018; 4:86. [PMID: 29379788 PMCID: PMC5770804 DOI: 10.3389/fcvm.2017.00086] [Citation(s) in RCA: 167] [Impact Index Per Article: 27.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2017] [Accepted: 12/11/2017] [Indexed: 12/22/2022] Open
Abstract
Efficient clearance of apoptotic cells, termed efferocytosis, critically regulates normal homeostasis whereas defective uptake of apoptotic cells results in chronic and non-resolving inflammatory diseases, such as advanced atherosclerosis. Monocyte-derived macrophages recruited into developing atherosclerotic lesions initially display efficient efferocytosis and temper inflammatory responses, processes that restrict plaque progression. However, during the course of plaque development, macrophages undergo cellular reprogramming that reduces efferocytic capacity, which results in post-apoptotic necrosis of apoptotic cells and inflammation. Furthermore, defective efferocytosis in advanced atherosclerosis is a major driver of necrotic core formation, which can trigger plaque rupture and acute thrombotic cardiovascular events. In this review, we discuss the molecular and cellular mechanisms that regulate efferocytosis, how efferocytosis promotes the resolution of inflammation, and how defective efferocytosis leads to the formation of clinically dangerous atherosclerotic plaques.
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Affiliation(s)
- Arif Yurdagul
- Department of Medicine, Columbia University, New York, NY, United States.,Department of Pathology and Cell Biology, Columbia University, New York, NY, United States.,Department of Physiology, Columbia University, New York, NY, United States
| | - Amanda C Doran
- Department of Medicine, Columbia University, New York, NY, United States.,Department of Pathology and Cell Biology, Columbia University, New York, NY, United States.,Department of Physiology, Columbia University, New York, NY, United States
| | - Bishuang Cai
- Department of Medicine, Columbia University, New York, NY, United States.,Department of Pathology and Cell Biology, Columbia University, New York, NY, United States.,Department of Physiology, Columbia University, New York, NY, United States
| | - Gabrielle Fredman
- Department of Molecular and Cellular Physiology, Albany Medical College, Albany, NY, United States
| | - Ira A Tabas
- Department of Medicine, Columbia University, New York, NY, United States.,Department of Pathology and Cell Biology, Columbia University, New York, NY, United States.,Department of Physiology, Columbia University, New York, NY, United States
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Hwang JS, Kang ES, Han SG, Lim DS, Paek KS, Lee CH, Seo HG. Formononetin inhibits lipopolysaccharide-induced release of high mobility group box 1 by upregulating SIRT1 in a PPARδ-dependent manner. PeerJ 2018; 6:e4208. [PMID: 29312829 PMCID: PMC5756453 DOI: 10.7717/peerj.4208] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2017] [Accepted: 12/09/2017] [Indexed: 12/27/2022] Open
Abstract
Background The release of high mobility group box 1 (HMGB1) induced by inflammatory signals acts as a cellular alarmin to trigger a chain of inflammatory responses. Although the inflammatory actions of HMGB1 are well studied, less is known about the therapeutic agents that can impede its release. This study investigated whether the isoflavonoid formononetin can modulate HMGB1 release in cellular inflammatory responses. Methods RAW264.7 murine macrophages were exposed to lipopolysaccharide (LPS) in the presence or absence of formononetin. The levels of HMGB1 release, sirtuin 1 (SIRT1) expression, and HMGB1 acetylation were analyzed by immunoblotting and real-time polymerase chain reaction. The effects of resveratrol and sirtinol, an activator and inhibitor of SIRT1, respectively, on LPS-induced HMGB1 release were also evaluated. Results Formononetin modulated cellular inflammatory responses by suppressing the release of HMGB1 by macrophages exposed to LPS. In RAW264.7 cells, formononetin significantly attenuated LPS-induced release of HMGB1 into the extracellular environment, which was accompanied by a reduction in its translocation from the nucleus to the cytoplasm. In addition, formononetin significantly induced mRNA and protein expression of SIRT1 in a peroxisome proliferator-activated receptor δ (PPARδ)-dependent manner. These effects of formononetin were dramatically attenuated in cells treated with small interfering RNA (siRNA) against PPARδ or with GSK0660, a specific inhibitor of PPARδ, indicating that PPARδ is involved in formononetin-mediated SIRT1 expression. In line with these effects, formononetin-mediated inhibition of HMGB1 release in LPS-treated cells was reversed by treatment with SIRT1-targeting siRNA or sirtinol, a SIRT1 inhibitor. By contrast, resveratrol, a SIRT1 activator, further potentiated the inhibitory effect of formononetin on LPS-induced HMGB1 release, revealing a possible mechanism by which formononetin regulates HMGB1 release through SIRT1. Furthermore, modulation of SIRT1 expression by transfection of SIRT1- or PPARδ-targeting siRNA significantly counteracted the inhibitory effects of formononetin on LPS-induced HMGB1 acetylation, which was responsible for HMGB1 release. Discussion This study shows for the first time that formononetin inhibits HMGB1 release by decreasing HMGB1 acetylation via upregulating SIRT1 in a PPARδ-dependent manner. Formononetin consequently exhibits anti-inflammatory activity. Identification of agents, such as formononetin, which can block HMGB1 release, may help to treat inflammation-related disorders.
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Affiliation(s)
- Jung Seok Hwang
- Department of Food Science and Biotechnology of Animal Products, Sanghuh College of Life Sciences, Konkuk University, Seoul, Korea
| | - Eun Sil Kang
- Department of Food Science and Biotechnology of Animal Products, Sanghuh College of Life Sciences, Konkuk University, Seoul, Korea
| | - Sung Gu Han
- Department of Food Science and Biotechnology of Animal Products, Sanghuh College of Life Sciences, Konkuk University, Seoul, Korea
| | - Dae-Seog Lim
- Department of Biotechnology, CHA University, Seongnam, Korea
| | | | - Chi-Ho Lee
- Department of Food Science and Biotechnology of Animal Products, Sanghuh College of Life Sciences, Konkuk University, Seoul, Korea
| | - Han Geuk Seo
- Department of Food Science and Biotechnology of Animal Products, Sanghuh College of Life Sciences, Konkuk University, Seoul, Korea
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87
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Israelian N, Danska JS. Sex Effects at the Ramparts: Nutrient- and Microbe-Mediated Regulation of the Immune-Metabolic Interface. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2017; 1043:113-140. [PMID: 29224093 DOI: 10.1007/978-3-319-70178-3_7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The relationships between dietary compounds, derivative metabolites, and host metabolism and immunity are controlled by diverse molecular mechanisms. Essential contributions to these dynamics come from the community of microbes (the microbiome) inhabiting the human digestive tract. The composition and function of the microbiome are shaped by available nutrients, and reciprocally, these organisms produce an as yet poorly defined repertoire of molecules that communicate with the epithelial barrier and the mucosal immune system. We present evidence that diet-derived vitamins and lipids regulate immunity and metabolic function and highlight the diverse mechanisms through which these effects are impacted by sex. We discuss exciting new data emerging from studies using high-throughput sequencing technology, specialized mouse models, and bio-specimens, and clinical data from human subjects that have begun to reveal the complexity of these interactions. Also profiled in this chapter are the striking sex differences in pathways by which dietary nutrients and gut microbes modify metabolism, immunity, and immune- and inflammation-mediated diseases. Although the incidence, severity, and therapeutic responses of many autoimmune diseases differ by sex, the molecular mechanisms of these effects remain poorly understood.
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Affiliation(s)
- Nyrie Israelian
- Department of Immunology, University of Toronto, Toronto, ON, Canada.,Program in Genetics and Genome Biology, Hospital for Sick Children, Toronto, ON, Canada
| | - Jayne S Danska
- Program in Genetics and Genome Biology, Hospital for Sick Children, Toronto, ON, Canada. .,Department of Immunology, and Department of Medical Biophysics, University of Toronto, Toronto, ON, Canada.
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88
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Robinson GA, Waddington KE, Pineda-Torra I, Jury EC. Transcriptional Regulation of T-Cell Lipid Metabolism: Implications for Plasma Membrane Lipid Rafts and T-Cell Function. Front Immunol 2017; 8:1636. [PMID: 29225604 PMCID: PMC5705553 DOI: 10.3389/fimmu.2017.01636] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2017] [Accepted: 11/09/2017] [Indexed: 01/10/2023] Open
Abstract
It is well established that cholesterol and glycosphingolipids are enriched in the plasma membrane (PM) and form signaling platforms called lipid rafts, essential for T-cell activation and function. Moreover, changes in PM lipid composition affect the biophysical properties of lipid rafts and have a role in defining functional T-cell phenotypes. Here, we review the role of transcriptional regulators of lipid metabolism including liver X receptors α/β, peroxisome proliferator-activated receptor γ, estrogen receptors α/β (ERα/β), and sterol regulatory element-binding proteins in T-cells. These receptors lie at the interface between lipid metabolism and immune cell function and are endogenously activated by lipids and/or hormones. Importantly, they regulate cellular cholesterol, fatty acid, glycosphingolipid, and phospholipid levels but are also known to modulate a broad spectrum of immune responses. The current evidence supporting a role for lipid metabolism pathways in controlling immune cell activation by influencing PM lipid raft composition in health and disease, and the potential for targeting lipid biosynthesis pathways to control unwanted T-cell activation in autoimmunity is reviewed.
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Affiliation(s)
- George A. Robinson
- Centre of Rheumatology, Division of Medicine, University College London, London, United Kingdom
| | - Kirsty E. Waddington
- Centre of Rheumatology, Division of Medicine, University College London, London, United Kingdom
- Clinical Pharmacology, Division of Medicine, University College London, London, United Kingdom
| | - Ines Pineda-Torra
- Clinical Pharmacology, Division of Medicine, University College London, London, United Kingdom
| | - Elizabeth C. Jury
- Centre of Rheumatology, Division of Medicine, University College London, London, United Kingdom
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89
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Trahtemberg U, Mevorach D. Apoptotic Cells Induced Signaling for Immune Homeostasis in Macrophages and Dendritic Cells. Front Immunol 2017; 8:1356. [PMID: 29118755 PMCID: PMC5661053 DOI: 10.3389/fimmu.2017.01356] [Citation(s) in RCA: 70] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2017] [Accepted: 10/03/2017] [Indexed: 12/24/2022] Open
Abstract
Inefficient and abnormal clearance of apoptotic cells (efferocytosis) contributes to systemic autoimmune disease in humans and mice, and inefficient chromosomal DNA degradation by DNAse II leads to systemic polyarthritis and a cytokine storm. By contrast, efficient clearance allows immune homeostasis, generally leads to a non-inflammatory state for both macrophages and dendritic cells (DCs), and contributes to maintenance of peripheral tolerance. As many as 3 × 108 cells undergo apoptosis every hour in our bodies, and one of the primary “eat me” signals expressed by apoptotic cells is phosphatidylserine (PtdSer). Apoptotic cells themselves are major contributors to the “anti-inflammatory” nature of the engulfment process, some by secreting thrombospondin-1 (TSP-1) or adenosine monophosphate and possibly other immune modulating “calm-down” signals that interact with macrophages and DCs. Apoptotic cells also produce “find me” and “tolerate me” signals to attract and immune modulate macrophages and DCs that express specific receptors for some of these signals. Neither macrophages nor DCs are uniform, and each cell type may variably express membrane proteins that function as receptors for PtdSer or for opsonins like complement or opsonins that bind to PtdSer, such as protein S and growth arrest-specific 6. Macrophages and DCs also express scavenger receptors, CD36, and integrins that function via bridging molecules such as TSP-1 or milk fat globule-EGF factor 8 protein and that differentially engage in various multi-ligand interactions between apoptotic cells and phagocytes. In this review, we describe the anti-inflammatory and pro-homeostatic nature of apoptotic cell interaction with the immune system. We do not review some forms of immunogenic cell death. We summarize the known apoptotic cell signaling events in macrophages and DCs that are related to toll-like receptors, nuclear factor kappa B, inflammasome, the lipid-activated nuclear receptors, Tyro3, Axl, and Mertk receptors, as well as induction of signal transducer and activator of transcription 1 and suppressor of cytokine signaling that lead to immune system silencing and DC tolerance. These properties of apoptotic cells are the mechanisms that enable their successful use as therapeutic modalities in mice and humans in various autoimmune diseases, organ transplantation, graft-versus-host disease, and sepsis.
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Affiliation(s)
- Uriel Trahtemberg
- General Intensive Care Unit, Hadassah-Hebrew University Medical Center, Jerusalem, Israel
| | - Dror Mevorach
- Rheumatology Research Center, Department of Medicine, Hadassah-Hebrew University Medical Center, Jerusalem, Israel
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90
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Hajishengallis G, Lamont RJ. Metabolic nuclear receptors in periodontal host-microbe interactions and inflammation. Mol Oral Microbiol 2017; 32:443-445. [PMID: 28984043 DOI: 10.1111/omi.12198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- G Hajishengallis
- Department of Microbiology, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - R J Lamont
- Department of Oral Immunology and Infectious Diseases, School of Dentistry, University of Louisville, Louisville, KY, USA
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91
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Matsushita K, Dzau VJ. Mesenchymal stem cells in obesity: insights for translational applications. J Transl Med 2017; 97:1158-1166. [PMID: 28414326 DOI: 10.1038/labinvest.2017.42] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2017] [Accepted: 02/24/2017] [Indexed: 12/11/2022] Open
Abstract
Obesity is now a major public health problem worldwide. Lifestyle modification to reduce the characteristic excess body adiposity is important in the treatment of obesity, but effective therapeutic intervention is still needed to control what has become an obesity epidemic. Unfortunately, many anti-obesity drugs have been withdrawn from market due to adverse side effects. Bariatric surgery therefore remains the most effective therapy for severe cases, although such surgery is invasive and researchers continue to seek new control strategies for obesity. Mesenchymal stem cells (MSCs) are a major source of adipocyte generation, and studies have been conducted into the potential roles of MSCs in treating obesity. However, despite significant progress in stem cell research and its potential applications for obesity, adipogenesis is a highly complex process and the molecular mechanisms governing MSC adipogenesis remain ill defined. In particular, successful clinical application of MSCs will require extensive identification and characterization of the transcriptional regulators controlling MSC adipogenesis. Since obesity is associated with the incidence of multiple important comorbidities, an in-depth understanding of the relationship between MSC adipogenesis and the comorbidities of obesity is also necessary to evaluate the potential of effective and safe MSC-based therapies for obesity. In addition, brown adipogenesis is an attractive topic from the viewpoint of therapeutic innovation and future research into MSC-based brown adipogenesis could lead to a novel breakthrough. Ongoing stem cell studies and emerging research fields such as epigenetics are expected to elucidate the complicated mechanisms at play in MSC adipogenesis and develop novel MSC-based therapeutic options for obesity. This review discusses the current understanding of MSCs in adipogenesis and their potential clinical applications for obesity.
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Affiliation(s)
- Kenichi Matsushita
- Division of Cardiology, Second Department of Internal Medicine, Kyorin University School of Medicine, Tokyo, Japan
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92
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Østrup O, Dagenborg VJ, Rødland EA, Skarpeteig V, Silwal-Pandit L, Grzyb K, Berstad AE, Fretland ÅA, Mælandsmo GM, Børresen-Dale AL, Ree AH, Edwin B, Nygaard V, Flatmark K. Molecular signatures reflecting microenvironmental metabolism and chemotherapy-induced immunogenic cell death in colorectal liver metastases. Oncotarget 2017; 8:76290-76304. [PMID: 29100312 PMCID: PMC5652706 DOI: 10.18632/oncotarget.19350] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2017] [Accepted: 06/26/2017] [Indexed: 01/05/2023] Open
Abstract
Background Metastatic colorectal cancer (CRC) is associated with highly variable clinical outcome and response to therapy. The recently identified consensus molecular subtypes (CMS1-4) have prognostic and therapeutic implications in primary CRC, but whether these subtypes are valid for metastatic disease is unclear. We performed multi-level analyses of resectable CRC liver metastases (CLM) to identify molecular characteristics of metastatic disease and evaluate the clinical relevance. Methods In this ancillary study to the Oslo-CoMet trial, CLM and tumor-adjacent liver tissue from 46 patients were analyzed by profiling mutations (targeted sequencing), genome-wide copy number alteration (CNAs), and gene expression. Results Somatic mutations and CNAs detected in CLM were similar to reported primary CRC profiles, while CNA profiles of eight metastatic pairs suggested intra-patient divergence. A CMS classifier tool applied to gene expression data, revealed the cohort to be highly enriched for CMS2. Hierarchical clustering of genes with highly variable expression identified two subgroups separated by high or low expression of 55 genes with immune-related and metabolic functions. Importantly, induction of genes and pathways associated with immunogenic cell death (ICD) was identified in metastases exposed to neoadjuvant chemotherapy (NACT). Conclusions The uniform classification of CLM by CMS subtyping may indicate that novel class discovery approaches need to be explored to uncover clinically useful stratification of CLM. Detected gene expression signatures support the role of metabolism and chemotherapy in shaping the immune microenvironment of CLM. Furthermore, the results point to rational exploration of immune modulating strategies in CLM, particularly by exploiting NACT-induced ICD.
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Affiliation(s)
- Olga Østrup
- Department of Tumor Biology, Institute for Cancer Research, Oslo University Hospital, The Norwegian Radium Hospital, Oslo, Norway
- Department of Cancer Genetics, Institute for Cancer Research, Oslo University Hospital, The Norwegian Radium Hospital, Oslo, Norway
| | - Vegar Johansen Dagenborg
- Department of Tumor Biology, Institute for Cancer Research, Oslo University Hospital, The Norwegian Radium Hospital, Oslo, Norway
- Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, Oslo, Norway
| | - Einar Andreas Rødland
- Department of Tumor Biology, Institute for Cancer Research, Oslo University Hospital, The Norwegian Radium Hospital, Oslo, Norway
- Department of Cancer Genetics, Institute for Cancer Research, Oslo University Hospital, The Norwegian Radium Hospital, Oslo, Norway
| | - Veronica Skarpeteig
- Department of Cancer Genetics, Institute for Cancer Research, Oslo University Hospital, The Norwegian Radium Hospital, Oslo, Norway
| | - Laxmi Silwal-Pandit
- Department of Cancer Genetics, Institute for Cancer Research, Oslo University Hospital, The Norwegian Radium Hospital, Oslo, Norway
| | - Krzysztof Grzyb
- Department of Pathology, Oslo University Hospital, Rikshospitalet, Oslo, Norway
| | - Audun Elnæs Berstad
- Department of Radiology, Oslo University Hospital, The Norwegian Radium Hospital, Oslo, Norway
| | - Åsmund Avdem Fretland
- Department of Hepato-Pancreato-Biliary Surgery, Oslo University Hospital, Rikshospitalet, Oslo, Norway
- The Intervention Centre, Oslo University Hospital, Rikshospitalet, Oslo, Norway
- Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, Oslo, Norway
| | - Gunhild Mari Mælandsmo
- Department of Tumor Biology, Institute for Cancer Research, Oslo University Hospital, The Norwegian Radium Hospital, Oslo, Norway
- Department of Pharmacy, University of Tromsø - The Arctic University of Norway, Tromsø, Norway
| | - Anne-Lise Børresen-Dale
- Department of Cancer Genetics, Institute for Cancer Research, Oslo University Hospital, The Norwegian Radium Hospital, Oslo, Norway
- Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, Oslo, Norway
| | - Anne Hansen Ree
- Department of Oncology, Akershus University Hospital, Lørenskog, Norway
- Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, Oslo, Norway
| | - Bjørn Edwin
- Department of Hepato-Pancreato-Biliary Surgery, Oslo University Hospital, Rikshospitalet, Oslo, Norway
- The Intervention Centre, Oslo University Hospital, Rikshospitalet, Oslo, Norway
- Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, Oslo, Norway
| | - Vigdis Nygaard
- Department of Tumor Biology, Institute for Cancer Research, Oslo University Hospital, The Norwegian Radium Hospital, Oslo, Norway
| | - Kjersti Flatmark
- Department of Tumor Biology, Institute for Cancer Research, Oslo University Hospital, The Norwegian Radium Hospital, Oslo, Norway
- Department of Gastroenterological Surgery, Oslo University Hospital, The Norwegian Radium Hospital, Oslo, Norway
- Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, Oslo, Norway
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93
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Cholesterol Accumulation in CD11c + Immune Cells Is a Causal and Targetable Factor in Autoimmune Disease. Immunity 2017; 45:1311-1326. [PMID: 28002731 DOI: 10.1016/j.immuni.2016.11.008] [Citation(s) in RCA: 80] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2016] [Revised: 07/25/2016] [Accepted: 10/20/2016] [Indexed: 02/06/2023]
Abstract
Liver X receptors (LXRs) are regulators of cholesterol metabolism that also modulate immune responses. Inactivation of LXR α and β in mice leads to autoimmunity; however, how the regulation of cholesterol metabolism contributes to autoimmunity is unclear. Here we found that cholesterol loading of CD11c+ cells triggered the development of autoimmunity, whereas preventing excess lipid accumulation by promoting cholesterol efflux was therapeutic. LXRβ-deficient mice crossed to the hyperlipidemic ApoE-deficient background or challenged with a high-cholesterol diet developed autoantibodies. Cholesterol accumulation in lymphoid organs promoted T cell priming and stimulated the production of the B cell growth factors Baff and April. Conversely, B cell expansion and the development of autoantibodies in ApoE/LXR-β-deficient mice was reversed by ApoA-I expression. These findings implicate cholesterol imbalance as a contributor to immune dysfunction and suggest that stimulating HDL-dependent reverse cholesterol transport could be beneficial in the setting of autoimmune disease.
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94
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Wang X, Shi L, Joyce S, Wang Y, Feng Y. MDG-1, a Potential Regulator of PPARα and PPARγ, Ameliorates Dyslipidemia in Mice. Int J Mol Sci 2017; 18:ijms18091930. [PMID: 28885549 PMCID: PMC5618579 DOI: 10.3390/ijms18091930] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2017] [Revised: 07/15/2017] [Accepted: 07/20/2017] [Indexed: 02/06/2023] Open
Abstract
Hyperlipidemia is a serious epidemic disease caused by lipid metabolism disorder, which is harmful to human health. MDG-1, a β-d-fructan polysaccharide extracted from Ophiopogon japonicus, has been shown to improve abnormal blood lipid levels and alleviate diabetes. However, the underlying mechanism on hyperlipidemia is largely unknown. In this study, male C57BL/6 mice were randomly separated into three groups, respectively: low-fat diet (Con), high-fat diet (HFD), and high-fat diet plus 5‰ MDG-1 (HFD + MDG-1). Body weight was measured and the serum lipid levels were analyzed. Using gene microarray, various core pathways, together with levels of gene expression within hepatocytes, were analyzed. RT-PCR was used to confirm the identity of the differentially expressed genes. MDG-1 could prevent obesity in HFD-induced mice and improve abnormal serum lipids. Besides, MDG-1 could regulate hyperlipidemia symptoms, specifically, and decrease fasting blood glucose, improve glucose tolerance, and ameliorate insulin resistance. According to results from gene microarray, most of the identified pathways were involved in the digestion and absorption of fat, biosynthesis, and catabolism of fatty acids as well as the secretion and biological synthesis of bile acids. Furthermore, MDG-1 may act upon peroxisome proliferator-activated receptors (PPAR) α and γ, activating PPARα whilst inhibiting PPARγ, thus having a potent hypolipidemic effect.
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Affiliation(s)
- Xu Wang
- Engineering Research Center of Modern Preparation Technology of TCM, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China.
| | - Linlin Shi
- Engineering Research Center of Modern Preparation Technology of TCM, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China.
| | - Sun Joyce
- Department of Biological Sciences, National University of Singapore, Singapore 117543, Singapore.
| | - Yuan Wang
- Engineering Research Center of Modern Preparation Technology of TCM, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China.
| | - Yi Feng
- Engineering Research Center of Modern Preparation Technology of TCM, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China.
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95
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Wang L, Xie H, Xu L, Liao Q, Wan S, Yu Z, Lin D, Zhang B, Lv Z, Wu Z, Sun X. rSj16 Protects against DSS-Induced Colitis by Inhibiting the PPAR-α Signaling Pathway. Am J Cancer Res 2017; 7:3446-3460. [PMID: 28912887 PMCID: PMC5596435 DOI: 10.7150/thno.20359] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Accepted: 06/17/2017] [Indexed: 12/14/2022] Open
Abstract
Background: Epidemiologic studies and animal model experiments have shown that parasites have significant modulatory effects on autoimmune disorders, including inflammatory bowel disease (IBD). Recombinant Sj16 (rSj16), a 16-kDa secreted protein of Schistosoma japonicum (S.japonicum) produced by Escherichia coli (E. coli), has been shown to have immunoregulatory effects in vivo and in vitro. In this study, we aimed to determine the effects of rSj16 on dextran sulfate sodium (DSS)-induced colitis. Methods: DSS-induced colitis mice were treated with rSj16. Body weight loss, disease activity index (DAI), myeloperoxidase (MPO) activity levels, colon lengths, macroscopic scores, histopathology findings, inflammatory cytokine levels and regulatory T cell (Treg) subset levels were examined. Moreover, the differential genes expression after treated with rSj16 were sequenced, analyzed and identified. Results: rSj16 attenuated clinical activity of DSS-induced colitis mice, diminished pro-inflammatory cytokine production, up-regulated immunoregulatory cytokine production and increased Treg percentages in DSS-induced colitis mice. Moreover, DSS-induced colitis mice treated with rSj16 displayed changes in the expression levels of specific genes in the colon and show the crucial role of peroxisome proliferator activated receptor α (PPAR-α) signaling pathway. PPAR-α activation diminished the therapeutic effects of rSj16 in DSS-induced colitis mice, indicating that the PPAR-α signaling pathway plays a crucial role in DSS-induced colitis development. Conclusions: rSj16 has protective effects on DSS-induced colitis, effects mediated mainly by PPAR-α signaling pathway inhibition. The findings of this study suggest that rSj16 may be useful as a therapeutic agent and that PPAR-α may be a new therapeutic target in the treatment of IBD.
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96
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Szondy Z, Sarang Z, Kiss B, Garabuczi É, Köröskényi K. Anti-inflammatory Mechanisms Triggered by Apoptotic Cells during Their Clearance. Front Immunol 2017; 8:909. [PMID: 28824635 PMCID: PMC5539239 DOI: 10.3389/fimmu.2017.00909] [Citation(s) in RCA: 131] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2017] [Accepted: 07/17/2017] [Indexed: 12/19/2022] Open
Abstract
In the human body, billions of cells die by apoptosis every day. The subsequent clearance of apoptotic cells by phagocytosis is normally efficient enough to prevent secondary necrosis and the consequent release of cell contents that would induce inflammation and trigger autoimmunity. In addition, apoptotic cells generally induce an anti-inflammatory response, thus removal of apoptotic cells is usually immunologically silent. Since the first discovery that uptake of apoptotic cells leads to transforming growth factor (TGF)-β and interleukin (IL)-10 release by engulfing macrophages, numerous anti-inflammatory mechanisms triggered by apoptotic cells have been discovered, including release of anti-inflammatory molecules from the apoptotic cells, triggering immediate anti-inflammatory signaling pathways by apoptotic cell surface molecules via phagocyte receptors, activating phagocyte nuclear receptors following uptake and inducing the production of anti-inflammatory soluble mediators by phagocytes that may act via paracrine or autocrine mechanisms to amplify and preserve the anti-inflammatory state. Here, we summarize our present knowledge about how these anti-inflammatory mechanisms operate during the clearance of apoptotic cells.
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Affiliation(s)
- Zsuzsa Szondy
- Department of Biochemistry and Molecular Biology of Medical Faculty, University of Debrecen, Debrecen, Hungary.,Department of Basic Medical Sciences of Dental Faculty, University of Debrecen, Debrecen, Hungary
| | - Zsolt Sarang
- Department of Biochemistry and Molecular Biology of Medical Faculty, University of Debrecen, Debrecen, Hungary
| | - Beáta Kiss
- Department of Biochemistry and Molecular Biology of Medical Faculty, University of Debrecen, Debrecen, Hungary
| | - Éva Garabuczi
- Department of Biochemistry and Molecular Biology of Medical Faculty, University of Debrecen, Debrecen, Hungary
| | - Krisztina Köröskényi
- Department of Biochemistry and Molecular Biology of Medical Faculty, University of Debrecen, Debrecen, Hungary.,Department of Basic Medical Sciences of Dental Faculty, University of Debrecen, Debrecen, Hungary
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97
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Holtman IR, Skola D, Glass CK. Transcriptional control of microglia phenotypes in health and disease. J Clin Invest 2017; 127:3220-3229. [PMID: 28758903 DOI: 10.1172/jci90604] [Citation(s) in RCA: 138] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Microglia are the main resident macrophage population of the CNS and perform numerous functions required for CNS development, homeostasis, immunity, and repair. Many lines of evidence also indicate that dysregulation of microglia contributes to the pathogenesis of neurodegenerative and behavioral diseases. These observations provide a compelling argument to more clearly define the mechanisms that control microglia identity and function in health and disease. In this Review, we present a conceptual framework for how different classes of transcription factors interact to select and activate regulatory elements that control microglia development and their responses to internal and external signals. We then describe functions of specific transcription factors in normal and pathological contexts and conclude with a consideration of open questions to be addressed in the future.
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Affiliation(s)
- Inge R Holtman
- Department of Cellular and Molecular Medicine, UCSD, San Diego, California, USA.,Department of Medical Physiology, University of Groningen, University Medical Center Groningen, Groningen, Netherlands
| | - Dylan Skola
- Department of Cellular and Molecular Medicine, UCSD, San Diego, California, USA
| | - Christopher K Glass
- Department of Cellular and Molecular Medicine, UCSD, San Diego, California, USA.,Department of Medicine, UCSD, San Diego, California, USA
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98
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Xu P, Hong F, Wang J, Wang J, Zhao X, Wang S, Xue T, Xu J, Zheng X, Zhai Y. DBZ is a putative PPARγ agonist that prevents high fat diet-induced obesity, insulin resistance and gut dysbiosis. Biochim Biophys Acta Gen Subj 2017; 1861:2690-2701. [PMID: 28736228 DOI: 10.1016/j.bbagen.2017.07.013] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2017] [Revised: 06/22/2017] [Accepted: 07/19/2017] [Indexed: 12/11/2022]
Abstract
BACKGROUND The nuclear receptor PPARγ is an effective pharmacological target for some types of metabolic syndrome, including obesity, diabetes, nonalcoholic fatty liver disease, and cardiovascular disease. However, the current PPARγ-targeting thiazolidinedione drugs have undesirable side effects. Danshensu Bingpian Zhi (DBZ), also known as tanshinol borneol ester derived from Salvia miltiorrhiza, is a synthetic derivative of natural compounds used in traditional Chinese medicine for its anti-inflammatory activity. METHODS In vitro, investigations of DBZ using a luciferase reporter assay and molecular docking identified this compound as a novel promising PPARγ agonist. Ten-week-old C57BL/6J mice were fed either a normal chow diet (NCD) or a high-fat diet (HFD). The HFD-fed mice were gavaged daily with either vehicle or DBZ (50mg/kg or 100mg/kg) for 10weeks. The gut microbiota composition was assessed by analyzing the 16S rRNA gene V3+V4 regions via pyrosequencing. RESULTS DBZ is an efficient natural PPARγ agonist that shows lower PPARγ-responsive luciferase reporter activity than thiazolidinediones, has excellent effects on the metabolic phenotype and exhibits no unwanted adverse effects in a HFD-induced obese mouse model. DBZ protects against HFD-induced body weight gain, insulin resistance, hepatic steatosis and inflammation in mice. DBZ not only stimulates brown adipose tissue (BAT) browning and maintains intestinal barrier integrity but also reverses HFD-induced intestinal microbiota dysbiosis. CONCLUSIONS DBZ is a putative PPARγ agonist that prevents HFD-induced obesity-related metabolic syndrome and reverse gut dysbiosis. GENERAL SIGNIFICANCE DBZ may be used as a beneficial probiotic agent to improve HFD-induced obesity-related metabolic syndrome in obese individuals.
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Affiliation(s)
- Pengfei Xu
- Beijing Key Laboratory of Gene Resource and Molecular Development, College of Life Sciences, Beijing Normal University, Beijing 100875, China
| | - Fan Hong
- Beijing Key Laboratory of Gene Resource and Molecular Development, College of Life Sciences, Beijing Normal University, Beijing 100875, China
| | - Jialin Wang
- Beijing Key Laboratory of Gene Resource and Molecular Development, College of Life Sciences, Beijing Normal University, Beijing 100875, China
| | - Jing Wang
- Beijing Key Laboratory of Gene Resource and Molecular Development, College of Life Sciences, Beijing Normal University, Beijing 100875, China
| | - Xia Zhao
- Shijingshan Teaching Hospital of Capital Medical University, Beijing Shijingshan Hospital, Beijing, 100043, China
| | - Sheng Wang
- Beijing Key Laboratory of Gene Resource and Molecular Development, College of Life Sciences, Beijing Normal University, Beijing 100875, China
| | - Tingting Xue
- Beijing Key Laboratory of Gene Resource and Molecular Development, College of Life Sciences, Beijing Normal University, Beijing 100875, China
| | - Jingwei Xu
- Gene Engineering and Biotechnology Beijing Key Laboratory, College of Life Sciences, Beijing Normal University, Beijing, 100875, China
| | - Xiaohui Zheng
- Key Laboratory of Resource Biology and Biotechnology in Western China, College of Life Sciences, Northwest University, Xi'an, 710069, China.
| | - Yonggong Zhai
- Beijing Key Laboratory of Gene Resource and Molecular Development, College of Life Sciences, Beijing Normal University, Beijing 100875, China; Key Laboratory for Cell Proliferation and Regulation Biology of State Education Ministry, College of Life Sciences, Beijing Normal University, Beijing, 100875, China.
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99
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Zarrinpar A, Bensinger SJ. The Therapeutic Potential of T Cell Metabolism. Am J Transplant 2017; 17:1705-1712. [PMID: 27931083 PMCID: PMC6705609 DOI: 10.1111/ajt.14149] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2016] [Revised: 11/02/2016] [Accepted: 11/25/2016] [Indexed: 01/25/2023]
Abstract
Transplant rejection mediated by the adaptive immune system remains a major barrier to achieving long-term tolerance and graft survival. Emerging evidence indicates that lymphocytes rapidly shift their metabolic programs in response to activation, co-stimulatory, and cytokine signals to support required effector cell differentiation and function. These observations have led to the hypothesis that manipulating the metabolic programs of immune cells could serve as a powerful therapeutic strategy for attenuating deleterious immune responses and facilitating durable tolerance in the setting of allogeneic solid organ or bone marrow transplant. In this mini-review, we introduce the fundamentals of metabolism, highlight the current understanding of how adaptive immune cells utilize their metabolic programs, and discuss the potential for targeting metabolism as a therapeutic approach to induce tolerance in the transplant setting.
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Affiliation(s)
- A. Zarrinpar
- Department of Surgery, David Geffen School of Medicine, University of California, Los Angeles, CA
| | - S. J. Bensinger
- Department of Molecular and Medical Pharmacology, David Geffen School of Medicine, University of California, Los Angeles, CA,Department of Microbiology, Immunology and Molecular Genetics, University of California, Los Angeles, CA,Corresponding author: Steven J. Bensinger,
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Rhoads JP, Major AS, Rathmell JC. Fine tuning of immunometabolism for the treatment of rheumatic diseases. Nat Rev Rheumatol 2017; 13:313-320. [PMID: 28381829 PMCID: PMC5502208 DOI: 10.1038/nrrheum.2017.54] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
All immune cells depend on specific and efficient metabolic pathways to mount an appropriate response. Over the past decade, the field of immunometabolism has expanded our understanding of the various means by which cells modulate metabolism to achieve the effector functions necessary to fight infection or maintain homeostasis. Harnessing these metabolic pathways to manipulate inappropriate immune responses as a therapeutic strategy in cancer and autoimmunity has received increasing scrutiny by the scientific community. Fine tuning immunometabolism to provide the desired response, or prevent a deleterious response, is an attractive alternative to chemotherapy or overt immunosuppression. The various metabolic pathways used by immune cells in rheumatoid arthritis, systemic lupus erythematosus and osteoarthritis offer numerous opportunities for selective targeting of specific immune cell subsets to manipulate cellular metabolism for therapeutic benefit in these rheumatologic diseases.
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Affiliation(s)
- Jillian P Rhoads
- Division of Molecular Pathology, Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, 1161 21st Avenue South, Nashville, Tennessee 37232, USA
| | - Amy S Major
- Division of Molecular Pathology, Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center; the Division of Rheumatology and Immunology, Department of Medicine, Vanderbilt University Medical Center; and the Vanderbilt Center for Immunobiology, Vanderbilt University School of Medicine, 1161 21st Avenue South, Nashville, Tennessee 37232, USA; and at the Department for Veterans Affairs, Tennessee Valley Healthcare System, Nashville, Tennessee 37232, USA
| | - Jeffrey C Rathmell
- Division of Molecular Pathology, Department of Pathology, Microbiology, and Immunology, and the Vanderbilt Center for Immunobiology, Vanderbilt University School of Medicine, 1161 21st Avenue South, Vanderbilt University Medical Center, Nashville, Tennessee 37232, USA
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