1
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Pezhman L, Hopkin SJ, Begum J, Heising S, Nasteska D, Wahid M, Ed Rainger G, Hodson DJ, Iqbal AJ, Chimen M, McGettrick HM. PEPITEM modulates leukocyte trafficking to reduce obesity-induced inflammation. Clin Exp Immunol 2023; 212:1-10. [PMID: 36891817 PMCID: PMC10081110 DOI: 10.1093/cei/uxad022] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Revised: 01/10/2023] [Accepted: 02/13/2023] [Indexed: 03/10/2023] Open
Abstract
Dysregulation of leukocyte trafficking, lipid metabolism, and other metabolic processes are the hallmarks that underpin and drive pathology in obesity. Current clinical management targets alternations in lifestyle choices (e.g. exercise, weight loss) to limit the impact of the disease. Crucially, re-gaining control over the pathogenic cellular and molecular processes may offer an alternative, complementary strategy for obese patients. Here we investigate the impact of the immunopeptide, PEPITEM, on pancreas homeostasis and leukocyte trafficking in mice on high-fed obesogenic diet (HFD). Both prophylactic and therapeutic treatment with PEPITEM alleviated the effects of HFD on the pancreas, reducing pancreatic beta cell size. Moreover, PEPITEM treatment also limited T-cell trafficking (CD4+ T-cells and KLRG1+ CD3+ T-cells) to obese visceral, but not subcutaneous, adipose tissue. Similarly, PEPITEM treatment reduced macrophage numbers within the peritoneal cavity of mice on HFD diet at both 6 and 12 weeks. By contrast, PEPITEM therapy elevated numbers of T and B cells were observed in the secondary lymphoid tissues (e.g. spleen and inguinal lymph node) when compared to the untreated HFD controls. Collectively our data highlights the potential for PEPITEM as a novel therapy to combat the systemic low-grade inflammation experienced in obesity and minimize the impact of obesity on pancreatic homeostasis. Thus, offering an alternative strategy to reduce the risk of developing obesity-related co-morbidities, such as type 2 diabetes mellitus, in individuals at high risk and struggling to control their weight through lifestyle modifications.
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Affiliation(s)
- Laleh Pezhman
- Institute of Inflammation and Ageing, University of Birmingham, Birmingham, UK
| | - Sophie J Hopkin
- Institute of Cardiovascular Sciences, University of Birmingham, Birmingham, UK
| | - Jenefa Begum
- Institute of Cardiovascular Sciences, University of Birmingham, Birmingham, UK
| | - Silke Heising
- Institute of Metabolism and Systems Research, University of Birmingham, Birmingham, UK
| | - Daniela Nasteska
- Institute of Metabolism and Systems Research, University of Birmingham, Birmingham, UK
| | - Mussarat Wahid
- Institute of Inflammation and Ageing, University of Birmingham, Birmingham, UK
| | - G Ed Rainger
- Institute of Cardiovascular Sciences, University of Birmingham, Birmingham, UK
| | - David J Hodson
- Institute of Metabolism and Systems Research, University of Birmingham, Birmingham, UK
| | - Asif J Iqbal
- Institute of Cardiovascular Sciences, University of Birmingham, Birmingham, UK
| | - Myriam Chimen
- Institute of Inflammation and Ageing, University of Birmingham, Birmingham, UK
| | - Helen M McGettrick
- Institute of Inflammation and Ageing, University of Birmingham, Birmingham, UK
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2
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Armitage EG, Barnes A, Patrick K, Bechar J, Harrison MJ, Lavery GG, Rainger GE, Buckley CD, Loftus NJ, Wilson ID, Naylor AJ. Metabolic consequences for mice lacking Endosialin: LC-MS/MS-based metabolic phenotyping of serum from C56Bl/6J Control and CD248 knock-out mice. Metabolomics 2021; 17:14. [PMID: 33462674 PMCID: PMC7813710 DOI: 10.1007/s11306-020-01764-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/21/2020] [Accepted: 12/22/2020] [Indexed: 11/17/2022]
Abstract
INTRODUCTION The Endosialin/CD248/TEM1 protein is expressed in adipose tissue and its expression increases with obesity. Recently, genetic deletion of CD248 has been shown to protect mice against atherosclerosis on a high fat diet. OBJECTIVES We investigated the effect of high fat diet feeding on visceral fat pads and circulating lipid profiles in CD248 knockout mice compared to controls. METHODS From 10 weeks old, CD248-/- and +/+ mice were fed either chow (normal) diet or a high fat diet for 13 weeks. After 13 weeks the metabolic profiles and relative quantities of circulating lipid species were assessed using ultra high performance liquid chromatography-quadrupole time-of flight mass spectrometry (UHPLC-MS) with high resolution accurate mass (HRAM) capability. RESULTS We demonstrate a specific reduction in the size of the perirenal fat pad in CD248-/- mice compared to CD248+/+, despite similar food intake. More strikingly, we identify significant, diet-dependent differences in the serum metabolic phenotypes of CD248 null compared to age and sex-matched wildtype control mice. Generalised protection from HFD-induced lipid accumulation was observed in CD248 null mice compared to wildtype, with particular reduction noted in the lysophosphatidylcholines, phosphatidylcholines, cholesterol and carnitine. CONCLUSIONS Overall these results show a clear and protective metabolic consequence of CD248 deletion in mice, implicating CD248 in lipid metabolism or trafficking and opening new avenues for further investigation using anti-CD248 targeting agents.
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Affiliation(s)
| | | | - Kieran Patrick
- Institute of Inflammation and Ageing, University of Birmingham, Birmingham, UK
| | - Janak Bechar
- Institute of Inflammation and Ageing, University of Birmingham, Birmingham, UK
| | - Matthew J Harrison
- Institute of Cardiovascular Sciences, University of Birmingham, Birmingham, UK
| | - Gareth G Lavery
- Institute of Metabolism and Systems Research, University of Birmingham, Birmingham, UK
| | - G Ed Rainger
- Institute of Cardiovascular Sciences, University of Birmingham, Birmingham, UK
| | - Christopher D Buckley
- Institute of Inflammation and Ageing, University of Birmingham, Birmingham, UK
- Kennedy Institute for Rheumatology, University of Oxford, Oxford, UK
| | | | - Ian D Wilson
- Department of Metabolism, Digestion and Reproduction, Imperial College, London, UK
| | - Amy J Naylor
- Institute of Inflammation and Ageing, University of Birmingham, Birmingham, UK.
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3
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Nathan P, Gibbs JE, Rainger GE, Chimen M. Changes in Circadian Rhythms Dysregulate Inflammation in Ageing: Focus on Leukocyte Trafficking. Front Immunol 2021; 12:673405. [PMID: 34054857 PMCID: PMC8160305 DOI: 10.3389/fimmu.2021.673405] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Accepted: 04/13/2021] [Indexed: 01/21/2023] Open
Abstract
Leukocyte trafficking shows strong diurnal rhythmicity and is tightly regulated by circadian rhythms. As we age, leukocyte trafficking becomes dysregulated, contributing to the increased systemic, low-grade, chronic inflammation observed in older adults. Ageing is also associated with diminished circadian outputs and a dysregulation of the circadian rhythm. Despite this, there is little evidence to show the direct impact of age-associated dampening of circadian rhythms on the dysregulation of leukocyte trafficking. Here, we review the core mammalian circadian clock machinery and discuss the changes that occur in this biological system in ageing. In particular, we focus on the changes that occur to leukocyte trafficking rhythmicity with increasing age and consider how this impacts inflammation and the development of immune-mediated inflammatory disorders (IMIDs). We aim to encourage future ageing biology research to include a circadian approach in order to fully elucidate whether age-related circadian changes occur as a by-product of healthy ageing, or if they play a significant role in the development of IMIDs.
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Affiliation(s)
- Poppy Nathan
- MRC-Versus Arthritis Centre for Musculoskeletal Ageing Research, Institute of Inflammation and Ageing, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Julie Elizabeth Gibbs
- Centre for Biological Timing, Faculty of Biology Medicine and Health, University of Manchester, Manchester, United Kingdom
| | - G. Ed Rainger
- Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Myriam Chimen
- MRC-Versus Arthritis Centre for Musculoskeletal Ageing Research, Institute of Inflammation and Ageing, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
- *Correspondence: Myriam Chimen,
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Evans PC, Rainger GE, Mason JC, Guzik TJ, Osto E, Stamataki Z, Neil D, Hoefer IE, Fragiadaki M, Waltenberger J, Weber C, Bochaton-Piallat ML, Bäck M. Endothelial dysfunction in COVID-19: a position paper of the ESC Working Group for Atherosclerosis and Vascular Biology, and the ESC Council of Basic Cardiovascular Science. Cardiovasc Res 2020; 116:2177-2184. [PMID: 32750108 PMCID: PMC7454368 DOI: 10.1093/cvr/cvaa230] [Citation(s) in RCA: 276] [Impact Index Per Article: 69.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/20/2020] [Revised: 06/30/2020] [Accepted: 07/24/2020] [Indexed: 02/07/2023] Open
Abstract
The COVID-19 pandemic is an unprecedented healthcare emergency causing mortality and illness across the world. Although primarily affecting the lungs, the SARS-CoV-2 virus also affects the cardiovascular system. In addition to cardiac effects, e.g. myocarditis, arrhythmias, and myocardial damage, the vasculature is affected in COVID-19, both directly by the SARS-CoV-2 virus, and indirectly as a result of a systemic inflammatory cytokine storm. This includes the role of the vascular endothelium in the recruitment of inflammatory leucocytes where they contribute to tissue damage and cytokine release, which are key drivers of acute respiratory distress syndrome (ARDS), in disseminated intravascular coagulation, and cardiovascular complications in COVID-19. There is also evidence linking endothelial cells (ECs) to SARS-CoV-2 infection including: (i) the expression and function of its receptor angiotensin-converting enzyme 2 (ACE2) in the vasculature; (ii) the prevalence of a Kawasaki disease-like syndrome (vasculitis) in COVID-19; and (iii) evidence of EC infection with SARS-CoV-2 in patients with fatal COVID-19. Here, the Working Group on Atherosclerosis and Vascular Biology together with the Council of Basic Cardiovascular Science of the European Society of Cardiology provide a Position Statement on the importance of the endothelium in the underlying pathophysiology behind the clinical presentation in COVID-19 and identify key questions for future research to address. We propose that endothelial biomarkers and tests of function (e.g. flow-mediated dilatation) should be evaluated for their usefulness in the risk stratification of COVID-19 patients. A better understanding of the effects of SARS-CoV-2 on endothelial biology in both the micro- and macrovasculature is required, and endothelial function testing should be considered in the follow-up of convalescent COVID-19 patients for early detection of long-term cardiovascular complications.
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Affiliation(s)
- Paul C Evans
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield and Insigneo Institute for In Silico Medicine, Sheffield, UK
| | - G Ed Rainger
- Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
| | - Justin C Mason
- Vascular Science, National Heart and Lung Institute, Imperial College London and Rheumatology Department, Imperial College Healthcare NHS Trust, Hammersmith Hospital, London, UK
| | - Tomasz J Guzik
- Institute of Cardiovascular and Medical Sciences, University of Glasgow, Glasgow, UK and Department of Medicine, Jagiellonian University Collegium Medicum, Cracow, Poland
| | - Elena Osto
- University and University Hospital Zurich, Institute of Clinical Chemistry and University Heart Center, Zurich, Switzerland and Swiss Federal Institute of Technology, Laboratory of Translational Nutrition Biology, Zurich, Switzerland
| | - Zania Stamataki
- Institute of Immunology and Immunotherapy, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
| | - Desley Neil
- Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
| | - Imo E Hoefer
- Central Diagnostic Laboratory, University Medical Centre Utrecht, The Netherlands
| | - Maria Fragiadaki
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield and Insigneo Institute for In Silico Medicine, Sheffield, UK
| | - Johannes Waltenberger
- Department of Cardiovascular Medicine, Medical Faculty, University of Münster, Münster, Germany and SRH Central Hospital Suhl, Suhl, Germany
| | - Christian Weber
- Institute for Cardiovascular Prevention (IPEK), Ludwig-Maximillian-Universität (LMU) München, German Center for Cardiovascular Research (DZHK), partner site Munich Heart Alliance, Munich Cluster for Systems Neurology (SyNergy), Munich, Germany and Department of Biochemistry, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, Maastricht, The Netherlands
| | | | - Magnus Bäck
- Center for Molecular Medicine and Department of Cardiology, Karolinska University Hospital, Solna, Stockholm, Sweden and INSERM U1116, Université de Lorraine, Centre Hospitalier Régional Universitaire de Nancy, Vandoeuvre les Nancy, France
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5
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Chimen M, Evryviadou A, Box CL, Harrison MJ, Hazeldine J, Dib LH, Kuravi SJ, Payne H, Price JMJ, Kavanagh D, Iqbal AJ, Lax S, Kalia N, Brill A, Thomas SG, Belli A, Crombie N, Adams RA, Evans SA, Deckmyn H, Lord JM, Harrison P, Watson SP, Nash GB, Rainger GE. Appropriation of GPIbα from platelet-derived extracellular vesicles supports monocyte recruitment in systemic inflammation. Haematologica 2020; 105:1248-1261. [PMID: 31467123 PMCID: PMC7193470 DOI: 10.3324/haematol.2018.215145] [Citation(s) in RCA: 52] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Accepted: 08/23/2019] [Indexed: 01/13/2023] Open
Abstract
Interactions between platelets, leukocytes and the vessel wall provide alternative pathological routes of thrombo-inflammatory leukocyte recruitment. We found that when platelets were activated by a range of agonists in whole blood, they shed platelet-derived extracellular vesicles which rapidly and preferentially bound to blood monocytes compared to other leukocytes. Platelet-derived extracellular vesicle binding to monocytes was initiated by P-selectin-dependent adhesion and was stabilised by binding of phosphatidylserine. These interactions resulted in the progressive transfer of the platelet adhesion receptor GPIbα to monocytes. GPIbα+-monocytes tethered and rolled on immobilised von Willebrand Factor or were recruited and activated on endothelial cells treated with TGF-β1 to induce the expression of von Willebrand Factor. In both models monocyte adhesion was ablated by a function-blocking antibody against GPIbα. Monocytes could also bind platelet-derived extracellular vesicle in mouse blood in vitro and in vivo Intratracheal instillations of diesel nanoparticles, to model chronic pulmonary inflammation, induced accumulation of GPIbα on circulating monocytes. In intravital experiments, GPIbα+-monocytes adhered to the microcirculation of the TGF-β1-stimulated cremaster muscle, while in the ApoE-/- model of atherosclerosis, GPIbα+-monocytes adhered to the carotid arteries. In trauma patients, monocytes bore platelet markers within 1 hour of injury, the levels of which correlated with severity of trauma and resulted in monocyte clearance from the circulation. Thus, we have defined a novel thrombo-inflammatory pathway in which platelet-derived extracellular vesicles transfer a platelet adhesion receptor to monocytes, allowing their recruitment in large and small blood vessels, and which is likely to be pathogenic.
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Affiliation(s)
- Myriam Chimen
- Institute of Cardiovascular Sciences, College of Medicine and Dentistry, University of Birmingham, Birmingham, UK
- NIHR Surgical Reconstruction and Microbiology Research Centre, Institute of Inflammation and Ageing, Birmingham University Medical School, Birmingham, UK
| | - Aigli Evryviadou
- Institute of Cardiovascular Sciences, College of Medicine and Dentistry, University of Birmingham, Birmingham, UK
| | - Clare L Box
- Institute of Cardiovascular Sciences, College of Medicine and Dentistry, University of Birmingham, Birmingham, UK
| | - Matthew J Harrison
- Institute of Cardiovascular Sciences, College of Medicine and Dentistry, University of Birmingham, Birmingham, UK
| | - Jon Hazeldine
- NIHR Surgical Reconstruction and Microbiology Research Centre, Institute of Inflammation and Ageing, Birmingham University Medical School, Birmingham, UK
| | - Lea H Dib
- Institute of Cardiovascular Sciences, College of Medicine and Dentistry, University of Birmingham, Birmingham, UK
| | - Sahithi J Kuravi
- Institute of Cardiovascular Sciences, College of Medicine and Dentistry, University of Birmingham, Birmingham, UK
| | - Holly Payne
- Institute of Cardiovascular Sciences, College of Medicine and Dentistry, University of Birmingham, Birmingham, UK
| | - Joshua M J Price
- NIHR Surgical Reconstruction and Microbiology Research Centre, Institute of Inflammation and Ageing, Birmingham University Medical School, Birmingham, UK
| | - Dean Kavanagh
- Institute of Cardiovascular Sciences, College of Medicine and Dentistry, University of Birmingham, Birmingham, UK
| | - Asif J Iqbal
- Institute of Cardiovascular Sciences, College of Medicine and Dentistry, University of Birmingham, Birmingham, UK
| | - Sian Lax
- Institute of Cardiovascular Sciences, College of Medicine and Dentistry, University of Birmingham, Birmingham, UK
| | - Neena Kalia
- Institute of Cardiovascular Sciences, College of Medicine and Dentistry, University of Birmingham, Birmingham, UK
| | - Alex Brill
- Institute of Cardiovascular Sciences, College of Medicine and Dentistry, University of Birmingham, Birmingham, UK
- Centre of Membrane Proteins and Receptors, University of Birmingham and Nottingham, The Midlands, UK
- Sechenov First Moscow State Medical University (Sechenov University), Moscow, Russia
| | - Steve G Thomas
- Institute of Cardiovascular Sciences, College of Medicine and Dentistry, University of Birmingham, Birmingham, UK
- Centre of Membrane Proteins and Receptors, University of Birmingham and Nottingham, The Midlands, UK
| | - Antonio Belli
- NIHR Surgical Reconstruction and Microbiology Research Centre, Institute of Inflammation and Ageing, Birmingham University Medical School, Birmingham, UK
| | - Nicholas Crombie
- NIHR Surgical Reconstruction and Microbiology Research Centre, Institute of Inflammation and Ageing, Birmingham University Medical School, Birmingham, UK
| | - Rachel A Adams
- Cardiff School of Health Sciences, Cardiff Metropolitan University, Cardiff, UK
| | - Shelley-Ann Evans
- Cardiff School of Health Sciences, Cardiff Metropolitan University, Cardiff, UK
| | - Hans Deckmyn
- Laboratory for Thrombosis Research, KU Leuven Campus Kulak Kortrijk, Kortrijk, Belgium
| | - Janet M Lord
- NIHR Surgical Reconstruction and Microbiology Research Centre, Institute of Inflammation and Ageing, Birmingham University Medical School, Birmingham, UK
| | - Paul Harrison
- NIHR Surgical Reconstruction and Microbiology Research Centre, Institute of Inflammation and Ageing, Birmingham University Medical School, Birmingham, UK
| | - Steve P Watson
- Institute of Cardiovascular Sciences, College of Medicine and Dentistry, University of Birmingham, Birmingham, UK
- Centre of Membrane Proteins and Receptors, University of Birmingham and Nottingham, The Midlands, UK
| | - Gerard B Nash
- Institute of Cardiovascular Sciences, College of Medicine and Dentistry, University of Birmingham, Birmingham, UK
| | - G Ed Rainger
- Institute of Cardiovascular Sciences, College of Medicine and Dentistry, University of Birmingham, Birmingham, UK
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6
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Noy PJ, Gavin RL, Colombo D, Haining EJ, Reyat JS, Payne H, Thielmann I, Lokman AB, Neag G, Yang J, Lloyd T, Harrison N, Heath VL, Gardiner C, Whitworth KM, Robinson J, Koo CZ, Di Maio A, Harrison P, Lee SP, Michelangeli F, Kalia N, Rainger GE, Nieswandt B, Brill A, Watson SP, Tomlinson MG. Tspan18 is a novel regulator of the Ca 2+ channel Orai1 and von Willebrand factor release in endothelial cells. Haematologica 2019; 104:1892-1905. [PMID: 30573509 PMCID: PMC6717597 DOI: 10.3324/haematol.2018.194241] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Accepted: 12/19/2018] [Indexed: 12/14/2022] Open
Abstract
Ca2+ entry via Orai1 store-operated Ca2+ channels in the plasma membrane is critical to cell function, and Orai1 loss causes severe immunodeficiency and developmental defects. The tetraspanins are a superfamily of transmembrane proteins that interact with specific 'partner proteins' and regulate their trafficking and clustering. The aim of this study was to functionally characterize tetraspanin Tspan18. We show that Tspan18 is expressed by endothelial cells at several-fold higher levels than most other cell types analyzed. Tspan18-knockdown primary human umbilical vein endothelial cells have 55-70% decreased Ca2+ mobilization upon stimulation with the inflammatory mediators thrombin or histamine, similar to Orai1-knockdown. Tspan18 interacts with Orai1, and Orai1 cell surface localization is reduced by 70% in Tspan18-knockdown endothelial cells. Tspan18 overexpression in lymphocyte model cell lines induces 20-fold activation of Ca2+ -responsive nuclear factor of activated T cell (NFAT) signaling, in an Orai1-dependent manner. Tspan18-knockout mice are viable. They lose on average 6-fold more blood in a tail-bleed assay. This is due to Tspan18 deficiency in non-hematopoietic cells, as assessed using chimeric mice. Tspan18-knockout mice have 60% reduced thrombus size in a deep vein thrombosis model, and 50% reduced platelet deposition in the microcirculation following myocardial ischemia-reperfusion injury. Histamine- or thrombin-induced von Willebrand factor release from endothelial cells is reduced by 90% following Tspan18-knockdown, and histamine-induced increase of plasma von Willebrand factor is reduced by 45% in Tspan18-knockout mice. These findings identify Tspan18 as a novel regulator of endothelial cell Orai1/Ca2+ signaling and von Willebrand factor release in response to inflammatory stimuli.
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Affiliation(s)
- Peter J Noy
- School of Biosciences, College of Life and Environmental Sciences, University of Birmingham, Birmingham, UK
| | - Rebecca L Gavin
- School of Biosciences, College of Life and Environmental Sciences, University of Birmingham, Birmingham, UK
| | - Dario Colombo
- Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
| | - Elizabeth J Haining
- Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
| | - Jasmeet S Reyat
- School of Biosciences, College of Life and Environmental Sciences, University of Birmingham, Birmingham, UK
| | - Holly Payne
- Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
| | - Ina Thielmann
- University Hospital Würzburg and Rudolf Virchow Center for Experimental Biomedicine, Würzburg, Germany
| | - Adam B Lokman
- Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
| | - Georgiana Neag
- Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
| | - Jing Yang
- School of Biosciences, College of Life and Environmental Sciences, University of Birmingham, Birmingham, UK
| | - Tammy Lloyd
- School of Biosciences, College of Life and Environmental Sciences, University of Birmingham, Birmingham, UK
| | - Neale Harrison
- School of Biosciences, College of Life and Environmental Sciences, University of Birmingham, Birmingham, UK
| | - Victoria L Heath
- Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
| | - Chris Gardiner
- Department of Haematology, University College London, London, UK
| | - Katharine M Whitworth
- Institute of Immunology and Immunotherapy, Cancer Immunology and Immunotherapy Centre, University of Birmingham, Birmingham, UK
| | - Joseph Robinson
- Institute of Immunology and Immunotherapy, Cancer Immunology and Immunotherapy Centre, University of Birmingham, Birmingham, UK
| | - Chek Z Koo
- School of Biosciences, College of Life and Environmental Sciences, University of Birmingham, Birmingham, UK
| | - Alessandro Di Maio
- School of Biosciences, College of Life and Environmental Sciences, University of Birmingham, Birmingham, UK
| | - Paul Harrison
- Scar Free Foundation for Burns Research, Queen Elizabeth Hospital Birmingham, University Hospitals Birmingham National Health Service (NHS) Foundation Trust, Birmingham, UK
- Institute of Inflammation and Ageing, University of Birmingham, Birmingham, UK
| | - Steven P Lee
- Institute of Immunology and Immunotherapy, Cancer Immunology and Immunotherapy Centre, University of Birmingham, Birmingham, UK
| | | | - Neena Kalia
- Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
- Centre of Membrane Proteins and Receptors (COMPARE), Universities of Birmingham and Nottingham, Birmingham-Nottingham, UK
| | - G Ed Rainger
- Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
| | - Bernhard Nieswandt
- University Hospital Würzburg and Rudolf Virchow Center for Experimental Biomedicine, Würzburg, Germany
| | - Alexander Brill
- Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
- Centre of Membrane Proteins and Receptors (COMPARE), Universities of Birmingham and Nottingham, Birmingham-Nottingham, UK
- Department of Pathophysiology, Sechenov First Moscow State Medical University, Moscow, Russia
| | - Steve P Watson
- Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
- Centre of Membrane Proteins and Receptors (COMPARE), Universities of Birmingham and Nottingham, Birmingham-Nottingham, UK
| | - Michael G Tomlinson
- School of Biosciences, College of Life and Environmental Sciences, University of Birmingham, Birmingham, UK
- Centre of Membrane Proteins and Receptors (COMPARE), Universities of Birmingham and Nottingham, Birmingham-Nottingham, UK
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7
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Borgognone A, Shantsila E, Worrall SM, Prompunt E, Loka T, Loudon BL, Chimen M, Ed Rainger G, Lord JM, Turner A, Nightingale P, Feelisch M, Kirchhof P, Lip GYH, Watson SP, Frenneaux MP, Madhani M. Nitrite circumvents platelet resistance to nitric oxide in patients with heart failure preserved ejection fraction and chronic atrial fibrillation. Cardiovasc Res 2019; 114:1313-1323. [PMID: 29659727 PMCID: PMC6054254 DOI: 10.1093/cvr/cvy087] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/05/2016] [Accepted: 04/09/2018] [Indexed: 12/18/2022] Open
Abstract
Aims Heart failure (HF) is a pro-thrombotic state. Both platelet and vascular responses to nitric oxide (NO) donors are impaired in HF patients with reduced ejection fraction (HFrEF) compared with healthy volunteers (HVs) due to scavenging of NO, and possibly also reduced activity of the principal NO sensor, soluble guanylate cyclase (sGC), limiting the therapeutic potential of NO donors as anti-aggregatory agents. Previous studies have shown that nitrite inhibits platelet activation presumptively after its reduction to NO, but the mechanism(s) involved remain poorly characterized. Our aim was to compare the effects of nitrite on platelet function in HV vs. HF patients with preserved ejection fraction (HFpEF) and chronic atrial fibrillation (HFpEF–AF), vs. patients with chronic AF without HF, and to assess whether these effects occur independent of the interaction with other formed elements of blood. Methods and results Platelet responses to nitrite and the NO donor sodium nitroprusside (SNP) were compared in age-matched HV controls (n = 12), HFpEF–AF patients (n = 29), and chronic AF patients (n = 8). Anti-aggregatory effects of nitrite in the presence of NO scavengers/sGC inhibitor were determined and vasodilator-stimulated phosphoprotein (VASP) phosphorylation was assessed using western blotting. In HV and chronic AF, both nitrite and SNP inhibited platelet aggregation in a concentration-dependent manner. Inhibition of platelet aggregation by the NO donor SNP was impaired in HFpEF-AF patients compared with healthy and chronic AF individuals, but there was no impairment of the anti-aggregatory effects of nitrite. Nitrite circumvented platelet NO resistance independently of other blood cells by directly activating sGC and phosphorylating VASP. Conclusion We here show for the first time that HFpEF-AF (but not chronic AF without HF) is associated with marked impairment of platelet NO responses due to sGC dysfunction and nitrite circumvents the ‘platelet NO resistance’ phenomenon in human HFpEF, at least partly, by acting as a direct sGC activator independent of NO.
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Affiliation(s)
- Alessandra Borgognone
- Institute of Cardiovascular Sciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
| | - Eduard Shantsila
- Institute of Cardiovascular Sciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK.,Sandwell and West Birmingham NHS Trust, City Hospital, Birmingham B18 7QH, UK
| | - Sophie M Worrall
- Institute of Cardiovascular Sciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
| | - Eakkapote Prompunt
- Institute of Cardiovascular Sciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
| | - Thomas Loka
- Institute of Cardiovascular Sciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
| | - Brodie L Loudon
- Norwich Medical School, University of East Anglia, Norwich NR4 7UQ, UK
| | - Myriam Chimen
- Institute of Cardiovascular Sciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
| | - G Ed Rainger
- Institute of Cardiovascular Sciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
| | - Janet M Lord
- Institute of Inflammation and Ageing, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
| | - Ashley Turner
- Sandwell and West Birmingham NHS Trust, City Hospital, Birmingham B18 7QH, UK
| | - Peter Nightingale
- Wellcome Trust Clinical Research Facility, Queen Elizabeth Hospital, Edgbaston, Birmingham B15 2TT, UK
| | - Martin Feelisch
- Clinical and Experimental Sciences, Faculty of Medicine, University of Southampton, Southampton SO16 6YD, UK
| | - Paulus Kirchhof
- Institute of Cardiovascular Sciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK.,Sandwell and West Birmingham NHS Trust, City Hospital, Birmingham B18 7QH, UK
| | - Gregory Y H Lip
- Institute of Cardiovascular Sciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK.,Sandwell and West Birmingham NHS Trust, City Hospital, Birmingham B18 7QH, UK
| | - Steve P Watson
- Institute of Cardiovascular Sciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
| | | | - Melanie Madhani
- Institute of Cardiovascular Sciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
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8
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Kapellos TS, Taylor L, Feuerborn A, Valaris S, Hussain MT, Rainger GE, Greaves DR, Iqbal AJ. Cannabinoid receptor 2 deficiency exacerbates inflammation and neutrophil recruitment. FASEB J 2019; 33:6154-6167. [PMID: 30799631 PMCID: PMC6629158 DOI: 10.1096/fj.201802524r] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Cannabinoid receptor (CB)2 is an immune cell–localized GPCR that has been hypothesized to regulate the magnitude of inflammatory responses. However, there is currently no consensus as to the mechanism by which CB2 mediates its anti-inflammatory effects in vivo. To address this question, we employed a murine dorsal air pouch model with wild-type and CB2−/− 8–12-wk-old female and male C57BL/6 mice and found that acute neutrophil and lymphocyte antigen 6 complex, locus Chi monocyte recruitment in response to Zymosan was significantly enhanced in CB2−/− mice. Additionally, levels of matrix metalloproteinase 9 and the chemokines C-C motif chemokine ligand (CCL)2, CCL4, and C-X-C motif chemokine ligand 10 in CB2−/− pouch exudates were elevated at earlier time points. Importantly, using mixed bone marrow chimeras, we revealed that the proinflammatory phenotype in CB2−/− mice is neutrophil-intrinsic rather than stromal cell–dependent. Indeed, neutrophils isolated from CB2−/− mice exhibited an enhanced migration-related transcriptional profile and increased adhesive phenotype, and treatment of human neutrophils with a CB2 agonist blocked their endothelial transmigration. Overall, we have demonstrated that CB2 plays a nonredundant role during acute neutrophil mobilization to sites of inflammation and, as such, it could represent a therapeutic target for the development of novel anti-inflammatory compounds to treat inflammatory human diseases.—Kapellos, T. S., Taylor, L., Feuerborn, A., Valaris, S., Hussain, M. T., Rainger, G. E., Greaves, D. R., Iqbal, A. J. Cannabinoid receptor 2 deficiency exacerbates inflammation and neutrophil recruitment.
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Affiliation(s)
- Theodore S Kapellos
- Sir William Dunn School of Pathology, University of Oxford, Oxford, United Kingdom
| | - Lewis Taylor
- Sir William Dunn School of Pathology, University of Oxford, Oxford, United Kingdom
| | - Alexander Feuerborn
- Sir William Dunn School of Pathology, University of Oxford, Oxford, United Kingdom
| | - Sophia Valaris
- Sir William Dunn School of Pathology, University of Oxford, Oxford, United Kingdom
| | - Mohammed T Hussain
- Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
| | - G E Rainger
- Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
| | - David R Greaves
- Sir William Dunn School of Pathology, University of Oxford, Oxford, United Kingdom
| | - Asif J Iqbal
- Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
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9
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Kardeby C, Fälker K, Haining EJ, Criel M, Lindkvist M, Barroso R, Påhlsson P, Ljungberg LU, Tengdelius M, Rainger GE, Watson S, Eble JA, Hoylaerts MF, Emsley J, Konradsson P, Watson SP, Sun Y, Grenegård M. Synthetic glycopolymers and natural fucoidans cause human platelet aggregation via PEAR1 and GPIbα. Blood Adv 2019; 3:275-287. [PMID: 30700416 PMCID: PMC6373755 DOI: 10.1182/bloodadvances.2018024950] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2018] [Accepted: 12/27/2018] [Indexed: 12/14/2022] Open
Abstract
Fucoidans are sulfated fucose-based polysaccharides that activate platelets and have pro- and anticoagulant effects; thus, they may have therapeutic value. In the present study, we show that 2 synthetic sulfated α-l-fucoside-pendant glycopolymers (with average monomeric units of 13 and 329) and natural fucoidans activate human platelets through a Src- and phosphatidylinositol 3-kinase (PI3K)-dependent and Syk-independent signaling cascade downstream of the platelet endothelial aggregation receptor 1 (PEAR1). Synthetic glycopolymers and natural fucoidan stimulate marked phosphorylation of PEAR1 and Akt, but not Syk. Platelet aggregation and Akt phosphorylation induced by natural fucoidan and synthetic glycopolymers are blocked by a monoclonal antibody to PEAR1. Direct binding of sulfated glycopolymers to epidermal like growth factor (EGF)-like repeat 13 of PEAR1 was shown by avidity-based extracellular protein interaction screen technology. In contrast, synthetic glycopolymers and natural fucoidans activate mouse platelets through a Src- and Syk-dependent pathway regulated by C-type lectin-like receptor 2 (CLEC-2) with only a minor role for PEAR1. Mouse platelets lacking the extracellular domain of GPIbα and human platelets treated with GPIbα-blocking antibodies display a reduced aggregation response to synthetic glycopolymers. We found that synthetic sulfated glycopolymers bind directly to GPIbα, substantiating that GPIbα facilitates the interaction of synthetic glycopolymers with CLEC-2 or PEAR1. Our results establish PEAR1 as the major signaling receptor for natural fucose-based polysaccharides and synthetic glycopolymers in human, but not in mouse, platelets. Sulfated α-l-fucoside-pendant glycopolymers are unique tools for further investigation of the physiological role of PEAR1 in platelets and beyond.
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Affiliation(s)
- Caroline Kardeby
- Cardiovascular Research Centre, School of Medical Sciences, Örebro University, Örebro, Sweden
| | - Knut Fälker
- Cardiovascular Research Centre, School of Medical Sciences, Örebro University, Örebro, Sweden
| | - Elizabeth J Haining
- Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Maarten Criel
- Center for Molecular and Vascular Biology, Department of Cardiovascular Sciences, University of Leuven, Leuven, Belgium
| | - Madelene Lindkvist
- Cardiovascular Research Centre, School of Medical Sciences, Örebro University, Örebro, Sweden
| | - Ruben Barroso
- Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
- Centre of Membrane Proteins and Receptors, Universities of Birmingham and Nottingham, The Midlands, United Kingdom
| | - Peter Påhlsson
- Division of Cell Biology, Department of Clinical and Experimental Medicine, and
| | - Liza U Ljungberg
- Cardiovascular Research Centre, School of Medical Sciences, Örebro University, Örebro, Sweden
| | | | - G Ed Rainger
- Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Stephanie Watson
- Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Johannes A Eble
- Institute of Physiological Chemistry and Pathobiochemistry, University of Münster, Münster, Germany; and
| | - Marc F Hoylaerts
- Center for Molecular and Vascular Biology, Department of Cardiovascular Sciences, University of Leuven, Leuven, Belgium
| | - Jonas Emsley
- Centre of Membrane Proteins and Receptors, Universities of Birmingham and Nottingham, The Midlands, United Kingdom
- Division of Biomolecular Science and Medicinal Chemistry, Centre for Biomolecular Sciences, School of Pharmacy, University of Nottingham, Nottingham, United Kingdom
| | - Peter Konradsson
- Division of Organic Chemistry, Linköping University, Linköping, Sweden
| | - Steve P Watson
- Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
- Centre of Membrane Proteins and Receptors, Universities of Birmingham and Nottingham, The Midlands, United Kingdom
| | - Yi Sun
- Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
- Centre of Membrane Proteins and Receptors, Universities of Birmingham and Nottingham, The Midlands, United Kingdom
| | - Magnus Grenegård
- Cardiovascular Research Centre, School of Medical Sciences, Örebro University, Örebro, Sweden
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10
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Lezama DR, Chimen M, Iqbal AJ, Rainger GE. P19 THE OMEGA 3 POLYUNSATURATED FATTY ACID, EICOSAPENTAENOIC ACID INHIBITS FOAM CELL FORMATION AND SECRETION OF PRO-INFLAMMATORY MEDIATORS. Cardiovasc Res 2018. [DOI: 10.1093/cvr/cvy216.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- D R Lezama
- Institute of Cardiovascular Sciences, The College of Medicine and Dentistry, The University of Birmingham, Birmingham
| | - M Chimen
- Institute of Cardiovascular Sciences, The College of Medicine and Dentistry, The University of Birmingham, Birmingham
| | - A J Iqbal
- Institute of Cardiovascular Sciences, The College of Medicine and Dentistry, The University of Birmingham, Birmingham
| | - G E Rainger
- Institute of Cardiovascular Sciences, The College of Medicine and Dentistry, The University of Birmingham, Birmingham
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11
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Harrison MJ, Chimen M, Hussain M, Iqbal AJ, Senis YA, Nash GB, Watson SP, Rainger GE. Signalling through Src family kinase isoforms is not redundant in models of thrombo-inflammatory vascular disease. J Cell Mol Med 2018; 22:4317-4327. [PMID: 29974666 PMCID: PMC6111872 DOI: 10.1111/jcmm.13721] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Accepted: 05/13/2018] [Indexed: 12/19/2022] Open
Abstract
The Src family kinases (SFK) are a group of signalling molecules with important regulatory functions in inflammation and haemostasis. Leucocytes and platelets express multiple isoforms of the SFKs. Previous studies used broad‐spectrum pharmacological inhibitors, or murine models deficient in multiple SFK isoforms, to demonstrate the functional consequences of deficiencies in SFK signalling. Here, we hypothesized that individual SFK operate in a non‐redundant fashion in the thrombo‐inflammatory recruitment of monocyte during atherosclerosis. Using in vitro adhesion assays and single SFK knockout mice crossed with the ApoE−/− model of atherosclerosis, we find that SFK signalling regulates platelet‐dependent recruitment of monocytes. However, loss of a single SFK, Fgr or Lyn, reduced platelet‐mediated monocyte recruitment in vitro. This translated into a significant reduction in the burden of atherosclerotic disease in Fgr−/−/ApoE−/− or Lyn−/−/ApoE−/− animals. SFK signalling is not redundant in thrombo‐inflammatory vascular disease and individual SFK may represent targets for therapeutic intervention.
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Affiliation(s)
- Matthew J Harrison
- Institute of Cardiovascular Sciences, College of Medical and Dental Science, The Medical School, University of Birmingham, Birmingham, UK
| | - Myriam Chimen
- Institute of Cardiovascular Sciences, College of Medical and Dental Science, The Medical School, University of Birmingham, Birmingham, UK
| | - Mohammed Hussain
- Institute of Cardiovascular Sciences, College of Medical and Dental Science, The Medical School, University of Birmingham, Birmingham, UK
| | - Asif J Iqbal
- Institute of Cardiovascular Sciences, College of Medical and Dental Science, The Medical School, University of Birmingham, Birmingham, UK
| | - Yotis A Senis
- Institute of Cardiovascular Sciences, College of Medical and Dental Science, The Medical School, University of Birmingham, Birmingham, UK
| | - Gerard B Nash
- Institute of Cardiovascular Sciences, College of Medical and Dental Science, The Medical School, University of Birmingham, Birmingham, UK
| | - Steve P Watson
- Institute of Cardiovascular Sciences, College of Medical and Dental Science, The Medical School, University of Birmingham, Birmingham, UK
| | - G Ed Rainger
- Institute of Cardiovascular Sciences, College of Medical and Dental Science, The Medical School, University of Birmingham, Birmingham, UK
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12
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Sheriff L, Alanazi A, Ward LSC, Ward C, Munir H, Rayes J, Alassiri M, Watson SP, Newsome PN, Rainger GE, Kalia N, Frampton J, McGettrick HM, Nash GB. Origin-Specific Adhesive Interactions of Mesenchymal Stem Cells with Platelets Influence Their Behavior After Infusion. Stem Cells 2018; 36:1062-1074. [PMID: 29488279 PMCID: PMC6099218 DOI: 10.1002/stem.2811] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Revised: 01/16/2018] [Accepted: 02/05/2018] [Indexed: 12/13/2022]
Abstract
We investigated the adhesive behavior of mesenchymal stem cells (MSC) in blood, which might influence their fate when infused as therapy. Isolated human bone marrow MSC (BMMSC) or umbilical cord MSC (UCMSC) adhered efficiently from flow to the matrix proteins, collagen, or fibronectin, but did not adhere to endothelial selectins. However, when suspended in blood, BMMSC no longer adhered to collagen, while UCMSC adhered along with many aggregated platelets. Neither MSC adhered to fibronectin from flowing blood, although the fibronectin surface did become coated with a platelet monolayer. UCMSC induced platelet aggregation in platelet rich plasma, and caused a marked drop in platelet count when mixed with whole human or mouse blood in vitro, or when infused into mice. In contrast, BMMSC did not activate platelets or induce changes in platelet count. Interestingly, isolated UCMSC and BMMSC both adhered to predeposited platelets. The differences in behavior in blood were attributable to expression of podoplanin (an activating ligand for the platelet receptor CLEC‐2), which was detected on UCMSC, but not BMMSC. Thus, platelets were activated when bound to UCMSC, but not BMMSC. Platelet aggregation by UCMSC was inhibited by recombinant soluble CLEC‐2, and UCMSC did not cause a reduction in platelet count when mixed with blood from mice deficient in CLEC‐2. We predict that both MSC would carry platelets in the blood, but their interaction with vascular endothelium would depend on podoplanin‐induced activation of the bound platelets. Such interactions with platelets might target MSC to damaged tissue, but could also be thrombotic. Stem Cells2018;36:1062–1074
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Affiliation(s)
- Lozan Sheriff
- Institute for Cardiovascular Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Asma Alanazi
- Institute for Cardiovascular Sciences, University of Birmingham, Birmingham, United Kingdom.,Medical College, King Saud bin Abdulaziz University for Health Sciences, Riyadh, KSA
| | - Lewis S C Ward
- Institute of Inflammation and Ageing, University of Birmingham, Birmingham, United Kingdom
| | - Carl Ward
- Institute of Cancer and Genomic Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Hafsa Munir
- Institute for Cardiovascular Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Julie Rayes
- Institute for Cardiovascular Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Mohammed Alassiri
- Institute for Cardiovascular Sciences, University of Birmingham, Birmingham, United Kingdom.,Medical College, King Saud bin Abdulaziz University for Health Sciences, Riyadh, KSA
| | - Steve P Watson
- Institute for Cardiovascular Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Phil N Newsome
- Centre for Liver Research, Institute of Immunology and Immunotherapy, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom.,National Institute for Health Research, Liver Biomedical Research Unit at University Hospitals Birmingham NHS Foundation Trust and the University of Birmingham, Birmingham, United Kingdom.,Liver Unit, University Hospitals Birmingham NHS Foundation Trust, Birmingham, United Kingdom
| | - G E Rainger
- Institute for Cardiovascular Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Neena Kalia
- Institute for Cardiovascular Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Jon Frampton
- Institute of Cancer and Genomic Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Helen M McGettrick
- Institute of Inflammation and Ageing, University of Birmingham, Birmingham, United Kingdom
| | - Gerard B Nash
- Institute for Cardiovascular Sciences, University of Birmingham, Birmingham, United Kingdom
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13
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Ahmad M, Kuravi S, Hodson J, Rainger GE, Nash GB, Vohra RK, Bradbury AW. The Relationship Between Serum Interleukin-1α and Asymptomatic Infrarenal Abdominal Aortic Aneurysm Size, Morphology, and Growth Rates. Eur J Vasc Endovasc Surg 2018; 56:130-135. [PMID: 29456054 DOI: 10.1016/j.ejvs.2018.01.015] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2017] [Accepted: 01/16/2018] [Indexed: 12/01/2022]
Abstract
OBJECTIVE/BACKGROUND In a pilot study, a relationship between abdominal aortic aneurysm (AAA) diameter and serum interleukin (IL)-1α levels was reported, and that endothelial cell (EC) activation in vitro in response to serum from patients with AAA was blocked by anti-IL-1α antibodies. The aim of the present study was to further investigate the relationship between serum IL-1α and asymptomatic infrarenal AAA size, morphology, and growth rates. METHODS Serum IL-1α was measured using enzyme linked immunosorbent assay in 101 patients with asymptomatic, infrarenal AAA and related to aneurysm size, morphology, and growth rates. RESULTS IL-1α was measured in 101 patients. There was no statistically significant difference in mean age between men and women. IL-1α was detectable in 62.4% of patients; median IL-1α titre was 3.26 pg/mL. There was no statistically significant relationship between IL-1α and maximum AAA antero-posterior diameter as measured by ultrasound (p = .649), AAA morphology (aortic length [p = .394], sac [p = .369], and thrombus volume [p = .629]) as measured on computed tomography, absolute increase in AAA diameter (p = .214), or AAA growth rate (p = .230). CONCLUSION IL-1α is detectable in the majority of patients with infrarenal AAA, but the cause and clinical significance of this novel observation remains unknown.
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Affiliation(s)
- Mehtab Ahmad
- Academic Department of Vascular Surgery, Heart of England NHS Foundation Trust, Birmingham, UK; The Institute of Cardiovascular Science, College of Medical and Dental Sciences, University of Birmingham, UK.
| | - Sahithi Kuravi
- Department of Statistics, Wolfson Computer Laboratory, University of Birmingham, Birmingham, UK
| | - James Hodson
- Department of Vascular Surgery, University Hospitals Birmingham NHS Foundation Trust, UK
| | - G Ed Rainger
- Department of Statistics, Wolfson Computer Laboratory, University of Birmingham, Birmingham, UK
| | - Gerard B Nash
- Department of Statistics, Wolfson Computer Laboratory, University of Birmingham, Birmingham, UK
| | - Rajiv K Vohra
- The Institute of Cardiovascular Science, College of Medical and Dental Sciences, University of Birmingham, UK
| | - Andrew W Bradbury
- Academic Department of Vascular Surgery, Heart of England NHS Foundation Trust, Birmingham, UK
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14
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Reyat JS, Chimen M, Noy PJ, Szyroka J, Rainger GE, Tomlinson MG. ADAM10-Interacting Tetraspanins Tspan5 and Tspan17 Regulate VE-Cadherin Expression and Promote T Lymphocyte Transmigration. J Immunol 2017; 199:666-676. [PMID: 28600292 PMCID: PMC5502317 DOI: 10.4049/jimmunol.1600713] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/22/2016] [Accepted: 05/10/2017] [Indexed: 12/25/2022]
Abstract
The recruitment of blood leukocytes across the endothelium to sites of tissue infection is central to inflammation, but also promotes chronic inflammatory diseases. A disintegrin and metalloproteinase 10 (ADAM10) is a ubiquitous transmembrane molecular scissor that is implicated in leukocyte transmigration by proteolytically cleaving its endothelial substrates. These include VE-cadherin, a homotypic adhesion molecule that regulates endothelial barrier function, and transmembrane chemokines CX3CL1 and CXCL16, which have receptors on leukocytes. However, a definitive role for endothelial ADAM10 in transmigration of freshly isolated primary leukocytes under flow has not been demonstrated, and the relative importance of distinct ADAM10 substrates is unknown. Emerging evidence suggests that ADAM10 can be regarded as six different molecular scissors with different substrate specificities, depending on which of six TspanC8 tetraspanins it is associated with, but TspanC8s remain unstudied in leukocyte transmigration. In the current study, ADAM10 knockdown on primary HUVECs was found to impair transmigration of freshly isolated human peripheral blood T lymphocytes, but not neutrophils or B lymphocytes, in an in vitro flow assay. This impairment was due to delayed transmigration rather than a complete block, and was overcome in the presence of neutrophils. Transmigration of purified lymphocytes was dependent on ADAM10 regulation of VE-cadherin, but not CX3CL1 and CXCL16. Tspan5 and Tspan17, the two most closely related TspanC8s by sequence, were the only TspanC8s that regulated VE-cadherin expression and were required for lymphocyte transmigration. Therefore endothelial Tspan5- and Tspan17-ADAM10 complexes may regulate inflammation by maintaining normal VE-cadherin expression and promoting T lymphocyte transmigration.
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Affiliation(s)
- Jasmeet S Reyat
- School of Biosciences, College of Life and Environmental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom; and.,Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - Myriam Chimen
- Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - Peter J Noy
- School of Biosciences, College of Life and Environmental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom; and
| | - Justyna Szyroka
- School of Biosciences, College of Life and Environmental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom; and
| | - G Ed Rainger
- Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - Michael G Tomlinson
- School of Biosciences, College of Life and Environmental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom; and
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15
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Chimen M, Yates CM, McGettrick HM, Ward LSC, Harrison MJ, Apta B, Dib LH, Imhof BA, Harrison P, Nash GB, Rainger GE. Monocyte Subsets Coregulate Inflammatory Responses by Integrated Signaling through TNF and IL-6 at the Endothelial Cell Interface. J Immunol 2017; 198:2834-2843. [PMID: 28193827 PMCID: PMC5357784 DOI: 10.4049/jimmunol.1601281] [Citation(s) in RCA: 63] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Accepted: 01/20/2017] [Indexed: 01/13/2023]
Abstract
Two major monocyte subsets, CD14+CD16− (classical) and CD14+/dimCD16+ (nonclassical/intermediate), have been described. Each has different functions ascribed in its interactions with vascular endothelial cells (EC), including migration and promoting inflammation. Although monocyte subpopulations have been studied in isolated systems, their influence on EC and on the course of inflammation has been ignored. In this study, using unstimulated or cytokine-activated EC, we observed significant differences in the recruitment, migration, and reverse migration of human monocyte subsets. Associated with this, and based on their patterns of cytokine secretion, there was a difference in their capacity to activate EC and support the secondary recruitment of flowing neutrophils. High levels of TNF were detected in cocultures with nonclassical/intermediate monocytes, the blockade of which significantly reduced neutrophil recruitment. In contrast, classical monocytes secreted high levels of IL-6, the blockade of which resulted in increased neutrophil recruitment. When cocultures contained both monocyte subsets, or when conditioned supernatant from classical monocytes cocultures (IL-6hi) was added to nonclassical/intermediate monocyte cocultures (TNFhi), the activating effects of TNF were dramatically reduced, implying that when present, the anti-inflammatory activities of IL-6 were dominant over the proinflammatory activities of TNF. These changes in neutrophil recruitment could be explained by regulation of E-selectin on the cocultured EC. This study suggests that recruited human monocyte subsets trigger a regulatory pathway of cytokine-mediated signaling at the EC interface, and we propose that this is a mechanism for limiting the phlogistic activity of newly recruited monocytes.
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Affiliation(s)
- Myriam Chimen
- Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - Clara M Yates
- Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - Helen M McGettrick
- Institute of Inflammation and Ageing, College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom; and
| | - Lewis S C Ward
- Institute of Inflammation and Ageing, College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom; and
| | - Matthew J Harrison
- Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - Bonita Apta
- Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - Lea H Dib
- Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - Beat A Imhof
- Department of Pathology and Immunology, University of Geneva, 1211 Geneva, Switzerland
| | - Paul Harrison
- Institute of Inflammation and Ageing, College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom; and
| | - Gerard B Nash
- Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - G Ed Rainger
- Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom;
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16
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Noy PJ, Yang J, Reyat JS, Matthews AL, Charlton AE, Furmston J, Rogers DA, Rainger GE, Tomlinson MG. TspanC8 Tetraspanins and A Disintegrin and Metalloprotease 10 (ADAM10) Interact via Their Extracellular Regions: EVIDENCE FOR DISTINCT BINDING MECHANISMS FOR DIFFERENT TspanC8 PROTEINS. J Biol Chem 2015; 291:3145-57. [PMID: 26668317 PMCID: PMC4751363 DOI: 10.1074/jbc.m115.703058] [Citation(s) in RCA: 67] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2015] [Indexed: 01/01/2023] Open
Abstract
A disintegrin and metalloprotease 10 (ADAM10) is a ubiquitously expressed transmembrane metalloprotease that cleaves the extracellular regions from its transmembrane substrates. ADAM10 is essential for embryonic development and is implicated in cancer, Alzheimer, and inflammatory diseases. The tetraspanins are a superfamily of 33 four-transmembrane proteins in mammals, of which the TspanC8 subgroup (Tspan5, 10, 14, 15, 17, and 33) promote ADAM10 intracellular trafficking and enzymatic maturation. However, the interaction between TspanC8s and ADAM10 has only been demonstrated in overexpression systems and the interaction mechanism remains undefined. To address these issues, an antibody was developed to Tspan14, which was used to show co-immunoprecipitation of Tspan14 with ADAM10 in primary human cells. Chimeric Tspan14 constructs demonstrated that the large extracellular loop of Tspan14 mediated its co-immunoprecipitation with ADAM10, and promoted ADAM10 maturation and trafficking to the cell surface. Chimeric ADAM10 constructs showed that membrane-proximal stalk, cysteine-rich, and disintegrin domains of ADAM10 mediated its co-immunoprecipitation with Tspan14 and other TspanC8s. This TspanC8-interacting region was required for ADAM10 exit from the endoplasmic reticulum. Truncated ADAM10 constructs revealed differential TspanC8 binding requirements for the stalk, cysteine-rich, and disintegrin domains. Moreover, Tspan15was the only TspanC8 to promote cleavage of the ADAM10 substrate N-cadherin, whereas Tspan14 was unique in reducing cleavage of the platelet collagen receptor GPVI. These findings suggest that ADAM10 may adopt distinct conformations in complex with different TspanC8s, which could impact on substrate selectivity. Furthermore, this study identifies regions of TspanC8s and ADAM10 for potential interaction-disrupting therapeutic targeting.
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Affiliation(s)
- Peter J Noy
- From the School of Biosciences, College of Life and Environmental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom and
| | - Jing Yang
- From the School of Biosciences, College of Life and Environmental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom and
| | - Jasmeet S Reyat
- From the School of Biosciences, College of Life and Environmental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom and
| | - Alexandra L Matthews
- From the School of Biosciences, College of Life and Environmental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom and
| | - Alice E Charlton
- From the School of Biosciences, College of Life and Environmental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom and
| | - Joanna Furmston
- From the School of Biosciences, College of Life and Environmental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom and
| | - David A Rogers
- From the School of Biosciences, College of Life and Environmental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom and
| | - G Ed Rainger
- School of Clinical and Experimental Medicine, College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - Michael G Tomlinson
- From the School of Biosciences, College of Life and Environmental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom and
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17
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Hitchcock JR, Cook CN, Bobat S, Ross EA, Flores-Langarica A, Lowe KL, Khan M, Dominguez-Medina CC, Lax S, Carvalho-Gaspar M, Hubscher S, Rainger GE, Cobbold M, Buckley CD, Mitchell TJ, Mitchell A, Jones ND, Van Rooijen N, Kirchhofer D, Henderson IR, Adams DH, Watson SP, Cunningham AF. Inflammation drives thrombosis after Salmonella infection via CLEC-2 on platelets. J Clin Invest 2015; 125:4429-46. [PMID: 26571395 DOI: 10.1172/jci79070] [Citation(s) in RCA: 114] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2014] [Accepted: 10/08/2015] [Indexed: 01/13/2023] Open
Abstract
Thrombosis is a common, life-threatening consequence of systemic infection; however, the underlying mechanisms that drive the formation of infection-associated thrombi are poorly understood. Here, using a mouse model of systemic Salmonella Typhimurium infection, we determined that inflammation in tissues triggers thrombosis within vessels via ligation of C-type lectin-like receptor-2 (CLEC-2) on platelets by podoplanin exposed to the vasculature following breaching of the vessel wall. During infection, mice developed thrombi that persisted for weeks within the liver. Bacteria triggered but did not maintain this process, as thrombosis peaked at times when bacteremia was absent and bacteria in tissues were reduced by more than 90% from their peak levels. Thrombus development was triggered by an innate, TLR4-dependent inflammatory cascade that was independent of classical glycoprotein VI-mediated (GPVI-mediated) platelet activation. After infection, IFN-γ release enhanced the number of podoplanin-expressing monocytes and Kupffer cells in the hepatic parenchyma and perivascular sites and absence of TLR4, IFN-γ, or depletion of monocytic-lineage cells or CLEC-2 on platelets markedly inhibited the process. Together, our data indicate that infection-driven thrombosis follows local inflammation and upregulation of podoplanin and platelet activation. The identification of this pathway offers potential therapeutic opportunities to control the devastating consequences of infection-driven thrombosis without increasing the risk of bleeding.
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Abstract
Besides their role in the formation of thrombus during haemostasis, it is becoming clear that platelets contribute to a number of other processes within the vasculature. Indeed, the integrated function of the thrombotic and inflammatory systems, which results in platelet-mediated recruitment of leukocytes, is now considered to be of great importance in the propagation, progression and pathogenesis of atherosclerotic disease of the arteries. There are three scenarios by which platelets can interact with leukocytes: (1) during haemostasis, when platelets adhere to and are activated on sub-endothelial matrix proteins exposed by vascular damage and then recruit leukocytes to a growing thrombus. (2) Platelets adhere to and are activated on stimulated endothelial cells and then bridge blood borne leukocytes to the vessel wall and. (3) Adhesion between platelets and leukocytes occurs in the blood leading to formation of heterotypic aggregates prior to contact with endothelial cells. In the following review we will not discuss leukocyte recruitment during haemostasis, as this represents a physiological response to tissue trauma that can progress, at least in its early stages, in the absence of inflammation. Rather we will deal with scenarios 2 and 3, as these pathways of platelet–leukocyte interactions are important during inflammation and in chronic inflammatory diseases such as atherosclerosis. Indeed, these interactions mean that leukocytes possess means of adhesion to the vessel wall under conditions that may not normally be permissive of leukocyte–endothelial cell adhesion, meaning that the disease process may be able to bypass the regulatory pathways which would ordinarily moderate the inflammatory response.
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Affiliation(s)
- G Ed Rainger
- Centre for Cardiovascular Sciences, Institute for Biomedical Research, The Medical School, The University of Birmingham , Birmingham , UK and
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Luu NT, McGettrick HM, Buckley CD, Newsome PN, Rainger GE, Frampton J, Nash GB. Crosstalk between mesenchymal stem cells and endothelial cells leads to downregulation of cytokine-induced leukocyte recruitment. Stem Cells 2015; 31:2690-702. [PMID: 23939932 DOI: 10.1002/stem.1511] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2013] [Accepted: 07/22/2013] [Indexed: 12/13/2022]
Abstract
Mesenchymal stem cells (MSC) have immunomodulatory properties, but their effects on endothelial cells (EC) and recruitment of leukocytes are unknown. We cocultured human bone marrow-derived MSC with EC and found that MSC could downregulate adhesion of flowing neutrophils or lymphocytes and their subsequent transendothelial migration. This applied for EC treated with tumor necrosis factor-α (TNF), interleukin-1β (IL-1), or TNF and interferon-γ combined. Supernatant from cocultures also inhibited endothelial responses. This supernatant had much higher levels of IL-6 than supernatant from cultures of the individual cells, which also lacked inhibitory functions. Addition of neutralizing antibody against IL-6 removed the bioactivity of the supernatant and also the immunomodulatory effects of coculture. Studies using siRNA showed that IL-6 came mainly from the MSC in coculture, and reduction in production in MSC alone was sufficient to impair the protective effects of coculture. Interestingly, siRNA knockdown of IL-6-receptor expression in MSC as well as EC inhibited anti-inflammatory effects. This was explained when we detected soluble IL-6R receptor in supernatants and showed that receptor removal reduced the potency of supernatant. Neutralization of transforming growth factor-β indicated that activation of this factor in coculture contributed to IL-6 production. Thus, crosstalk between MSC and EC caused upregulation of production of IL-6 by MSC which in turn downregulated the response of EC to inflammatory cytokines, an effect potentiated by MSC release of soluble IL-6R. These studies establish a novel mechanism by which MSC might have protective effects against inflammatory pathology and cardiovascular disease.
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Affiliation(s)
- N Thin Luu
- Centre for Cardiovascular Sciences, University of Birmingham, Birmingham, United Kingdom
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20
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Abstract
Stromal cells regulate the recruitment of circulating leukocytes during inflammation through cross-talk with neighboring endothelial cells. Here we describe two in vitro "vascular" models for studying the recruitment of circulating neutrophils from flow by inflamed endothelial cells. A major advantage of these models is the ability to analyze each step in the leukocyte adhesion cascade in order, as would occur in vivo. We also describe how both models can be adapted to study the role of stromal cells, in this case mesenchymal stem cells (MSC), in regulating leukocyte recruitment. Primary endothelial cells were cultured alone or together with human MSC in direct contact on Ibidi microslides or on opposite sides of a Transwell filter for 24 hr. Cultures were stimulated with tumor necrosis factor alpha (TNFα) for 4 hr and incorporated into a flow-based adhesion assay. A bolus of neutrophils was perfused over the endothelium for 4 min. The capture of flowing neutrophils and their interactions with the endothelium was visualized by phase-contrast microscopy. In both models, cytokine-stimulation increased endothelial recruitment of flowing neutrophils in a dose-dependent manner. Analysis of the behavior of recruited neutrophils showed a dose-dependent decrease in rolling and a dose-dependent increase in transmigration through the endothelium. In co-culture, MSC suppressed neutrophil adhesion to TNFα-stimulated endothelium. Our flow based-adhesion models mimic the initial phases of leukocyte recruitment from the circulation. In addition to leukocytes, they can be used to examine the recruitment of other cell types, such as therapeutically administered MSC or circulating tumor cells. Our multi-layered co-culture models have shown that MSC communicate with endothelium to modify their response to pro-inflammatory cytokines, altering the recruitment of neutrophils. Further research using such models is required to fully understand how stromal cells from different tissues and conditions (inflammatory disorders or cancer) influence the recruitment of leukocytes during inflammation.
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Affiliation(s)
- Hafsa Munir
- School of Clinical and Experimental Medicine, University of Birmingham; College of Medical and Dental Sciences, University of Birmingham
| | - G Ed Rainger
- School of Clinical and Experimental Medicine, University of Birmingham; College of Medical and Dental Sciences, University of Birmingham
| | - Gerard B Nash
- School of Clinical and Experimental Medicine, University of Birmingham; College of Medical and Dental Sciences, University of Birmingham
| | - Helen McGettrick
- College of Medical and Dental Sciences, University of Birmingham; School of Immunity and Infection, University of Birmingham;
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21
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Robertson AL, Holmes GR, Bojarczuk AN, Burgon J, Loynes CA, Chimen M, Sawtell AK, Hamza B, Willson J, Walmsley SR, Anderson SR, Coles MC, Farrow SN, Solari R, Jones S, Prince LR, Irimia D, Rainger GE, Kadirkamanathan V, Whyte MKB, Renshaw SA. A zebrafish compound screen reveals modulation of neutrophil reverse migration as an anti-inflammatory mechanism. Sci Transl Med 2014; 6:225ra29. [PMID: 24574340 DOI: 10.1126/scitranslmed.3007672] [Citation(s) in RCA: 175] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Diseases of failed inflammation resolution are common and largely incurable. Therapeutic induction of inflammation resolution is an attractive strategy to bring about healing without increasing susceptibility to infection. However, therapeutic targeting of inflammation resolution has been hampered by a lack of understanding of the underlying molecular controls. To address this drug development challenge, we developed an in vivo screen for proresolution therapeutics in a transgenic zebrafish model. Inflammation induced by sterile tissue injury was assessed for accelerated resolution in the presence of a library of known compounds. Of the molecules with proresolution activity, tanshinone IIA, derived from a Chinese medicinal herb, potently induced inflammation resolution in vivo both by induction of neutrophil apoptosis and by promoting reverse migration of neutrophils. Tanshinone IIA blocked proinflammatory signals in vivo, and its effects are conserved in human neutrophils, supporting a potential role in treating human inflammation and providing compelling evidence of the translational potential of this screening strategy.
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Affiliation(s)
- Anne L Robertson
- Medical Research Council Centre for Developmental and Biomedical Genetics, University of Sheffield, Sheffield S10 2TN, UK
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22
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Lordkipanidze M, Harrison MJ, Watson SP, Rainger GE. Abstract 265: Platelet C-Type Lectinlike (CLEC)-2 Receptor Plays a Protective Role Against Development of Atherosclerosis in Atherosclerosis-Prone Mice. Arterioscler Thromb Vasc Biol 2014. [DOI: 10.1161/atvb.34.suppl_1.265] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background:
Platelets can influence progression of plaque formation by facilitating recruitment of inflammatory cells at the sites of atherosclerotic lesions. A C-type lectin-like receptor, CLEC-2, abundantly expressed on the platelet surface, has been shown to regulate lymphatic development in utero though an interaction with Podoplanin. Interestingly, lymphatic vasculature is increased in ischemic and inflamed hearts, and in cholesterol-rich atherosclerotic lesions. Moreover, Podoplanin expression is up-regulated on inflammatory macrophages and on T-helper 17 cells. However, the role of the Podoplanin - CLEC-2 interaction in atherosclerosis remains unknown.
Aim:
We sought to investigate the role of CLEC-2 on atherosclerotic development in ApoE-deficient mice.
Methods:
CreERT.CLEC-2fl/fl x ApoE-/- and litter-matched ApoE-/- mice were treated with tamoxifen at the age of 9 weeks and were put on a high-fat diet for 6 weeks. Animals were killed at the age of 16 weeks, when platelet function assays and atherosclerosis assays were carried out.
Results:
Expression of CLEC-2 was abolished in tamoxifen-treated CreERT.CLEC-2fl/fl x ApoE-/- mice (n=8), whereas normal levels were seen in ApoE-/- controls (n=10) also treated with tamoxifen. CreERT.CLEC-2fl/fl x ApoE-/- and ApoE-/- mice had similar baseline characteristics, comparable levels of platelet glycoprotein expression (GPIb, GPIIbIIIa and GPVI) and normal platelet responses to platelet agonists (collagen-related peptide, PAR-4 peptide, ADP and arachidonic acid). Blood lipid levels were comparable between CreERT.CLEC-2fl/fl x ApoE-/- and control animals. Atherosclerotic plaque burden was significantly higher in the aortas of CreERT.CLEC-2fl/fl x ApoE-/- mice fed a high-fat diet for 6 weeks compared with their ApoE-/- counterparts. The higher plaque burden was seen consistently throughout the aorta, but reached significance at the level of whole aorta, abdominal aorta, outer curvature and the left subclavian region. This was seen in both male and female animals.
Conclusions:
The platelet-borne CLEC-2 receptor appears to have a protective role against atherogenesis in atheroprone mice. Further research to investigate the underlying mechanisms is warranted.
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Affiliation(s)
| | - Matthew J Harrison
- Cardiovascular and Respiratory Sciences, Univ of Birmingham, Birmingham, United Kingdom
| | - Steve P Watson
- Cardiovascular and Respiratory Sciences, Univ of Birmingham, Birmingham, United Kingdom
| | - G E Rainger
- Cardiovascular and Respiratory Sciences, Univ of Birmingham, Birmingham, United Kingdom
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23
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Yates CM, Calder PC, Ed Rainger G. Pharmacology and therapeutics of omega-3 polyunsaturated fatty acids in chronic inflammatory disease. Pharmacol Ther 2014; 141:272-82. [DOI: 10.1016/j.pharmthera.2013.10.010] [Citation(s) in RCA: 264] [Impact Index Per Article: 26.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2013] [Accepted: 10/12/2013] [Indexed: 12/11/2022]
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24
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Chimen M, McGettrick HM, Yates C, Martin A, Barone F, Walker L, Buckley C, Nash G, Narendran P, Rainger GE. 187 THE PEPTIDE INHIBITOR OF TRANS-ENDOTHELIAL MIGRATION, PEPITEM, A NOVEL IMMUNE REGUALTORY AGENT, CONTROLS T-CELL TRAFFICKING DURING INFLAMMATION, A TONIC INHIBITORY PATHWAY THAT IS LOST IN CHRONIC DISEASE. Heart 2013. [DOI: 10.1136/heartjnl-2013-304019.187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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25
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Harrison M, Smith E, Ross E, Krams R, Segers D, Buckley CD, Nash GB, Rainger GE. The Role of Platelet-Endothelial Cell Adhesion Molecule-1 in Atheroma Formation Varies Depending on the Site-Specific Hemodynamic Environment. Arterioscler Thromb Vasc Biol 2013; 33:694-701. [DOI: 10.1161/atvbaha.112.300379] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Objective—
Polymorphisms in the platelet-endothelial cell adhesion molecule (PECAM-1)-1 gene are linked to increased risk of coronary artery disease. Because PECAM-1 has been demonstrated to form a mechanosensory complex that can modulate inflammatory responses in murine arterial endothelial cells, we hypothesized that PECAM-1 contributes to atherogenesis in a shear-dependent and site-specific manner.
Approach and Results—
ApoE
–/–
mice that were wild-type, heterozygous, or deficient in PECAM-1 were placed on a high-fat diet. Detailed analysis of the aorta at sites with differing hemodynamics revealed that PECAM-1–deficient mice had reduced disease in areas of disturbed flow, whereas plaque burden was increased in areas of steady, laminar flow. In concordance with these observations, bone marrow chimera experiments revealed that hematopoietic PECAM-1 resulted in accelerated atheroma formation in areas of laminar and disturbed flow, however endothelial PECAM-1 moderated disease progression in areas of high sheer stress. Moreover, using shear stress–modifying carotid cuffs, PECAM-1 was shown to promote macrophage recruitment into lesions developing in areas of low shear stress.
Conclusions—
PECAM-1 on bone marrow cells is proatherogenic irrespective of the hemodynamic environment, however endothelial cell PECAM-1 is antiatherogenic in high shear environments. Thus, targeting this pathway therapeutically would require a cell-type and context-specific strategy.
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Affiliation(s)
- Matthew Harrison
- From the College of Medical and Dental Science, The Medical School, University of Birmingham, UK (M.H., E.S., E.R., C.D.B., G.B.N., G.E.R.); Bioengineering, Imperial College, Campus South Kensington, London (R.K.); and Cardiology, Erasmus MC, Rotterdam, UK (D.S.)
| | - Emily Smith
- From the College of Medical and Dental Science, The Medical School, University of Birmingham, UK (M.H., E.S., E.R., C.D.B., G.B.N., G.E.R.); Bioengineering, Imperial College, Campus South Kensington, London (R.K.); and Cardiology, Erasmus MC, Rotterdam, UK (D.S.)
| | - Ewan Ross
- From the College of Medical and Dental Science, The Medical School, University of Birmingham, UK (M.H., E.S., E.R., C.D.B., G.B.N., G.E.R.); Bioengineering, Imperial College, Campus South Kensington, London (R.K.); and Cardiology, Erasmus MC, Rotterdam, UK (D.S.)
| | - Robert Krams
- From the College of Medical and Dental Science, The Medical School, University of Birmingham, UK (M.H., E.S., E.R., C.D.B., G.B.N., G.E.R.); Bioengineering, Imperial College, Campus South Kensington, London (R.K.); and Cardiology, Erasmus MC, Rotterdam, UK (D.S.)
| | - Dolf Segers
- From the College of Medical and Dental Science, The Medical School, University of Birmingham, UK (M.H., E.S., E.R., C.D.B., G.B.N., G.E.R.); Bioengineering, Imperial College, Campus South Kensington, London (R.K.); and Cardiology, Erasmus MC, Rotterdam, UK (D.S.)
| | - Christopher D. Buckley
- From the College of Medical and Dental Science, The Medical School, University of Birmingham, UK (M.H., E.S., E.R., C.D.B., G.B.N., G.E.R.); Bioengineering, Imperial College, Campus South Kensington, London (R.K.); and Cardiology, Erasmus MC, Rotterdam, UK (D.S.)
| | - Gerard B. Nash
- From the College of Medical and Dental Science, The Medical School, University of Birmingham, UK (M.H., E.S., E.R., C.D.B., G.B.N., G.E.R.); Bioengineering, Imperial College, Campus South Kensington, London (R.K.); and Cardiology, Erasmus MC, Rotterdam, UK (D.S.)
| | - G. Ed Rainger
- From the College of Medical and Dental Science, The Medical School, University of Birmingham, UK (M.H., E.S., E.R., C.D.B., G.B.N., G.E.R.); Bioengineering, Imperial College, Campus South Kensington, London (R.K.); and Cardiology, Erasmus MC, Rotterdam, UK (D.S.)
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26
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Luu NT, Glen KE, Egginton S, Rainger GE, Nash GB. Integrin-substrate interactions underlying shear-induced inhibition of the inflammatory response of endothelial cells. Thromb Haemost 2012; 109:298-308. [PMID: 23238518 DOI: 10.1160/th12-06-0400] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2012] [Accepted: 11/08/2012] [Indexed: 11/05/2022]
Abstract
Conditioning of endothelial cells by shear stress suppresses their response to inflammatory cytokines. We questioned whether signalling through different integrin-matrix interactions, previously associated with the pathogenic effects of disturbed flow, supported the anti-inflammatory action of steady shear. Primary human endothelial cells were cultured on different substrates and exposed to shear stress (2.0Pa) for varying periods before stimulation with tumour necrosis factor-α (TNF). Shear-conditioning inhibited cytokine-induced recruitment of flowing neutrophils. However, the effect was similar for culture on collagen, laminin or fibronectin, even when seeding was reduced to 2 hours, and shear to 3 hours before TNF treatment (to minimise deposition of endothelial matrix). Nevertheless, in short- or longer-term cultures, reduction in expression of β(1)-integrin (but not β(3)-integrin) using siRNA essentially ablated the effect of shear-conditioning on neutrophil recruitment. Studies of focal adhesion kinase (FAK) phosphorylation, siRNA against FAK and a FAK-inhibitor (PF573228) indicated that FAK activity was an essential component downstream of β(1)-integrin. In addition, MAP-kinase p38 was phosphorylated downstream of FAK and also required for functional modification. Mechanotransduction through β(1)-integrins, FAK and p38 is required for anti-inflammatory effects of steady shear stress. Separation of the pathways which underlie pathological versus protective responses of different patterns of flow is required to enable therapeutic modification or mimicry, respectively.
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Affiliation(s)
- N Thin Luu
- Prof. Gerard Nash, School of Clinical and Experimental Medicine, College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, UK, Tel.: +44 121 414 3670, Fax: +44 121 414 6919, E-mail:
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27
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Harrison M, Nash G, Watson S, Ed Rainger G. Is platelet mediated leukocyte recruitment a drugable target in atherosclerosis? Atherosclerosis 2012. [DOI: 10.1016/j.atherosclerosis.2012.10.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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28
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Kuravi SJ, Bevins A, Satchell SC, Harper L, Williams JM, Rainger GE, Savage CO, Tull SP. Neutrophil serine proteases mediate inflammatory cell recruitment by glomerular endothelium and progression towards dysfunction. Nephrol Dial Transplant 2012; 27:4331-8. [DOI: 10.1093/ndt/gfs180] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
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29
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Glen K, Luu NT, Ross E, Buckley CD, Rainger GE, Egginton S, Nash GB. Modulation of functional responses of endothelial cells linked to angiogenesis and inflammation by shear stress: Differential effects of the mechanotransducer CD31. J Cell Physiol 2012; 227:2710-21. [DOI: 10.1002/jcp.23015] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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30
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Jeffery HC, Filer A, Buckley CD, Ed Rainger G, Nash GB, McGettrick HM. Fibroblasts from different tissues promote entry but retain lymphocytes in 3D models of tissue. Ann Rheum Dis 2012. [DOI: 10.1136/annrheumdis-2011-201235.18] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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31
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McGettrick HM, Butler LM, Buckley CD, Ed Rainger G, Nash GB. Tissue stroma as a regulator of leukocyte recruitment in inflammation. J Leukoc Biol 2012; 91:385-400. [DOI: 10.1189/jlb.0911458] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
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32
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Chamberlain G, Smith H, Rainger GE, Middleton J. Mesenchymal stem cells exhibit firm adhesion, crawling, spreading and transmigration across aortic endothelial cells: effects of chemokines and shear. PLoS One 2011; 6:e25663. [PMID: 21980522 PMCID: PMC3182247 DOI: 10.1371/journal.pone.0025663] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2011] [Accepted: 09/07/2011] [Indexed: 12/13/2022] Open
Abstract
Mesenchymal stem cells (MSCs) have anti-inflammatory and immunosuppressive properties and may be useful in the therapy of diseases such as arteriosclerosis. MSCs have some ability to traffic into inflamed tissues, however to exploit this therapeutically their migratory mechanisms need to be elucidated. This study examines the interaction of murine MSCs (mMSCs) with, and their migration across, murine aortic endothelial cells (MAECs), and the effects of chemokines and shear stress. The interaction of mMSCs with MAECs was examined under physiological flow conditions. mMSCs showed lack of interaction with MAECs under continuous flow. However, when the flow was stopped (for 10min) and then started, mMSCs adhered and crawled on the endothelial surface, extending fine microvillous processes (filopodia). They then spread extending pseudopodia in multiple directions. CXCL9 significantly enhanced the percentage of mMSCs adhering, crawling and spreading and shear forces markedly stimulated crawling and spreading. CXCL9, CXCL16, CCL20 and CCL25 significantly enhanced transendothelial migration across MAECs. The transmigrated mMSCs had down-regulated receptors CXCR3, CXCR6, CCR6 and CCR9. This study furthers the knowledge of MSC transendothelial migration and the effects of chemokines and shear stress which is of relevance to inflammatory diseases such as arteriosclerosis.
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Affiliation(s)
- Giselle Chamberlain
- Leopold Muller Arthritis Research Centre, Medical School, Keele University, RJAH Orthopaedic Hospital, Oswestry, Shropshire, United Kingdom
| | - Helen Smith
- Leopold Muller Arthritis Research Centre, Medical School, Keele University, RJAH Orthopaedic Hospital, Oswestry, Shropshire, United Kingdom
| | - G. Ed Rainger
- School of Clinical and Experimental Medicine, College of Medicine and Dentistry, University of Birmingham, Birmingham, United Kingdom
| | - Jim Middleton
- Leopold Muller Arthritis Research Centre, Medical School, Keele University, RJAH Orthopaedic Hospital, Oswestry, Shropshire, United Kingdom
- Faculty of Medicine and Dentistry, School of Oral and Dental Sciences, University of Bristol, Bristol, United Kingdom
- * E-mail:
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34
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Yates CM, Tull SP, Madden J, Calder PC, Grimble RF, Nash GB, Rainger GE. Docosahexaenoic acid inhibits the adhesion of flowing neutrophils to cytokine stimulated human umbilical vein endothelial cells. J Nutr 2011; 141:1331-4. [PMID: 21613456 DOI: 10.3945/jn.111.139287] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
The (n-3) PUFA, DHA, is widely thought to posses the ability to modulate the inflammatory response. However, its modes of interaction with inflammatory cells are poorly understood. In particular, there are limited data on the interactions of DHA with vascular endothelium, the cells that regulate the traffic of leukocytes from the blood into inflamed tissue. Using human umbilical vein endothelial cells (EC) cultured in a flow-based adhesion assay and activated with TNFα, we tested whether supplementing human umbilical vein EC with physiologically achievable concentrations of DHA would inhibit the recruitment of flowing neutrophils. DHA caused a dose-dependent reduction in neutrophil recruitment to the EC surface, although cells that became adherent were activated and could migrate across the human umbilical vein EC monolayer normally. Using EPA as an alternative supplement had no effect on the levels of neutrophil adhesion in this assay. Analysis of adhesion receptor expression by qPCR demonstrated that DHA did not alter the transcriptional activity of human umbilical vein EC. However, DHA did significantly reduce E-selectin expression at the human umbilical vein EC surface without altering the total cellular pool of this adhesion receptor. Thus, we have identified a novel mechanism by which DHA alters the trafficking of leukocytes during inflammation and demonstrate that this involves disruption of intracellular transport mechanisms used to present adhesion molecules on the surface of cytokine-stimulated EC.
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Affiliation(s)
- Clara M Yates
- Centre for Cardiovascular Sciences, School of Clinical and Experimental Medicine, The Medical School, The University of Birmingham, Birmingham B15 2TT, UK
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35
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Ahmed SR, McGettrick HM, Yates CM, Buckley CD, Ratcliffe MJ, Nash GB, Rainger GE. Prostaglandin D2 regulates CD4+ memory T cell trafficking across blood vascular endothelium and primes these cells for clearance across lymphatic endothelium. J Immunol 2011; 187:1432-9. [PMID: 21715691 DOI: 10.4049/jimmunol.1100299] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Memory lymphocytes support inflammatory and immune responses. To do this, they enter tissue via blood vascular endothelial cells (BVEC) and leave tissue via lymphatic vascular endothelial cells (LVEC). In this study, we describe a hierarchy of signals, including novel regulatory steps, which direct the sequential migration of human T cells across the blood and the lymphatic EC. Cytokine-stimulated (TNF and IFN) human BVEC preferentially recruited memory T cells from purified PBL. Lymphocyte recruitment from flow could be blocked using a function-neutralizing Ab against CXCR3. However, a receptor antagonist directed against the PGD(2) receptor DP2 (formerly chemoattractant receptor-homologous molecule expressed on Th2 cells) inhibited transendothelial migration, demonstrating that the sequential delivery of the chemokine and prostanoid signals was required for efficient lymphocyte recruitment. CD4(+) T cells recruited by BVEC migrated with significantly greater efficiency across a second barrier of human LVEC, an effect reproduced by the addition of exogenous PGD(2) to nonmigrated cells. Migration across BVEC or exogenous PGD(2) modified the function, but not the expression, of CCR7, so that chemotaxis toward CCL21 was significantly enhanced. Thus, chemokines may not regulate all stages of lymphocyte migration during inflammation, and paradigms describing their trafficking may need to account for the role of PGD(2).
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Affiliation(s)
- S Rumel Ahmed
- School of Clinical and Experimental Medicine, Medical School, University of Birmingham, Birmingham B15 2TT, United Kingdom
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Woodfin A, Voisin MB, Beyrau M, Colom B, Caille D, Diapouli FM, Nash GB, Chavakis T, Albelda SM, Rainger GE, Meda P, Imhof BA, Nourshargh S. The junctional adhesion molecule JAM-C regulates polarized transendothelial migration of neutrophils in vivo. Nat Immunol 2011; 12:761-9. [PMID: 21706006 PMCID: PMC3145149 DOI: 10.1038/ni.2062] [Citation(s) in RCA: 421] [Impact Index Per Article: 32.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2011] [Accepted: 05/26/2011] [Indexed: 12/14/2022]
Abstract
Neutrophil migration into inflamed tissues is a fundamental component of innate immunity. A decisive step in this process is the polarised migration of blood neutrophils through endothelial cells (ECs) lining the venular lumen (transendothelial cell migration; TEM) in a luminal to abluminal direction. Using real-time confocal imaging we report that neutrophils can exhibit disrupted polarised TEM (“hesitant” and “reverse”) in vivo. These events were noted in inflammation following ischemia-reperfusion injury, characterised by reduced expression of junctional adhesion molecule C (JAM-C) from EC junctions, and were enhanced by EC JAM-C blockade or genetic deletion. The results identify JAM-C as a key regulator of polarised neutrophil TEM in vivo and suggest that reverse TEM neutrophils can contribute to dissemination of systemic inflammation.
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Affiliation(s)
- Abigail Woodfin
- William Harvey Research Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, Charterhouse Square, London, UK
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Yates CM, Abdelhamid M, Adam DJ, Nash GB, Bradbury AW, Rainger GE. Endovascular aneurysm repair reverses the increased titer and the inflammatory activity of interleukin-1α in the serum of patients with abdominal aortic aneurysm. J Vasc Surg 2011; 54:497-503. [PMID: 21620624 DOI: 10.1016/j.jvs.2011.02.061] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2010] [Revised: 02/23/2011] [Accepted: 02/26/2011] [Indexed: 11/19/2022]
Abstract
OBJECTIVE To examine serum cytokine/chemokine profiles before and 6 months after endovascular repair (EVAR) of abdominal aortic aneurysm (AAA) and to determine whether they correlate with serum inflammatory activity using an in vitro model of leukocyte recruitment. METHODS Serum IL-1-α, IL-1β, IL-4, IL-6, IL-8, IL-10, IFN-γ, IP-10, MCP-1, TNF-α, and TNF-β were measured using a cytometry-based immunoassay. To test patient serum for direct inflammatory activity, human endothelial cells (EC) were stimulated with 30% patient serum for 24 hours. To test patient serum for the ability to prime EC for inflammatory responses, EC were incubated with 30% patient serum for 24 hours, followed by stimulation with low-dose (5 U/mL) TNF for 4 hours. Under both regimens of stimulation, the degree of EC activation was assessed by assaying neutrophil recruitment in a flow-based model. RESULTS Only IL-1α (67.9 ± 10.4 pg/mL vs 41.9 ± 7.4 pg/mL) and IL-8 (51.5 ± 5.1 vs 32.6 ± 4.7 pg/mL) changed significantly after surgery. Patient serum alone was unable to activate EC. However, serum from both time points could prime EC responses to low-dose TNF. Thus, after priming with preoperative serum, EC stimulated with TNF could recruit 76.7 ± 12.0 neutrophils/mm(2) into the subendothelial cell space. Post-EVAR serum was significantly less effective (44.4 ± 10.2 neutrophils/mm(2)). This reduction in neutrophil recruitment correlated with reduced IL-1α in post-EVAR serum. The addition of a neutralizing antibody against IL-1α to pre-EVAR serum inhibited EC priming and neutrophil recruitment, strongly implying that this cytokine was the priming agent. CONCLUSION EVAR reduces serum IL-1α and its inflammatory activity in patient serum. IL-1α is, therefore, implicated in the molecular pathology of AAAs and may have potential as a clinically useful biomarker.
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Affiliation(s)
- Clara M Yates
- School of Clinical and Experimental Medicine, The University of Birmingham, Birmingham, UK
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McGettrick HM, Buckley CD, Filer A, Rainger GE, Nash GB. Stromal cells differentially regulate neutrophil and lymphocyte recruitment through the endothelium. Immunology 2011; 131:357-70. [PMID: 20518822 PMCID: PMC2992690 DOI: 10.1111/j.1365-2567.2010.03307.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
Stromal fibroblasts modify the initial recruitment of leucocytes by endothelial cells (EC), but their effects on subsequent transendothelial migration remain unclear. Here, EC and dermal or synovial fibroblasts were cultured on opposite surfaces of 3-μm pore filters and incorporated in static or flow-based migration assays. Fibroblasts had little effect on tumour necrosis factor-α-induced transendothelial migration of neutrophils, but tended to increase the efficiency of migration away from the endothelium. Surprisingly, similar close contact between EC and fibroblasts strongly reduced lymphocyte migration in static assays, and nearly abolished stable lymphocyte adhesion from flow. Fibroblasts did not alter endothelial surface expression of adhesion molecules or messenger RNA for chemokines. Inhibition of attachment did not occur when EC-fibroblast contact was restricted by using 0.4-μm pore filters, but under these conditions pre-treatment with heparinase partially inhibited adhesion. In the 3-μm pore co-cultures, inhibition of metalloproteinase activity partially recovered lymphocyte adhesion, but addition of CXCL12 (SDF-1α) to the endothelial surface did not. Hence, the ability of EC to present activating chemokines for lymphocytes may have been enzymatically inhibited by direct contact with fibroblasts. To avoid contact, we cultured EC and fibroblasts on separate 3-μm pore filters one above the other. Here, fibroblasts promoted the transendothelial migration of lymphocytes. Fibroblasts generate CXCL12, but blockade of CXCL12 receptor had no effect on lymphocyte migration. While stromal cells can provide signal(s) promoting leucocyte migration away from the sub-endothelial space, direct cell contact (which might occur in damaged tissue) may cause disruption of chemokine signalling, specifically inhibiting lymphocyte rather than neutrophil recruitment.
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Affiliation(s)
- Helen M McGettrick
- Centre for Cardiovascular Sciences, School of Clinical and Experimental Medicine, Medical School, The University of Birmingham, Birmingham, UK.
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Burton VJ, Butler LM, McGettrick HM, Stone PC, Jeffery HC, Savage CO, Rainger GE, Nash GB. Delay of migrating leukocytes by the basement membrane deposited by endothelial cells in long-term culture. Exp Cell Res 2010; 317:276-92. [PMID: 21056557 PMCID: PMC3025349 DOI: 10.1016/j.yexcr.2010.10.022] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2010] [Revised: 10/25/2010] [Accepted: 10/27/2010] [Indexed: 12/25/2022]
Abstract
We investigated the migration of human leukocytes through endothelial cells (EC), and particularly their underlying basement membrane (BM). EC were cultured for 20 days on 3 μm-pore filters or collagen gels to form a distinct BM, and then treated with tumour necrosis factor-α, interleukin-1β or interferon-γ. Neutrophil migration through the cytokine-treated EC and BM was delayed for 20-day compared to 4-day cultures. The BM alone obstructed chemotaxis of neutrophils, and if fresh EC were briefly cultured on stripped BM, there was again a hold-up in migration. In studies with lymphocytes and monocytes, we could detect little hold-up of migration for 20-day versus 4-day cultures, in either the filter- or gel-based models. Direct microscopic observations showed that BM also held-up neutrophil migration under conditions of flow. Treatment of upper and/or lower compartments of filters with antibodies against integrins, showed that neutrophil migration through the endothelial monolayer was dependent on β2-integrins, but not β1- or β3-integrins. Migration from the subendothelial compartment was supported by β1- and β2-integrins for all cultures, but blockade of β3-integrin only inhibited migration effectively for 20-day cultures. Flow cytometry indicated that there was no net increase in expression of β1- or β3-integrins during neutrophil migration, and that their specific subendothelial function was likely dependent on turnover of integrins during migration. These studies show that BM is a distinct barrier to migration of human neutrophils, and that β3-integrins are particularly important in crossing this barrier. The lesser effect of BM on lymphocytes and monocytes supports the concept that crossing the BM is a separate, leukocyte-specific, regulated step in migration.
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Affiliation(s)
- Victoria J Burton
- Centre for Cardiovascular Sciences and MRC Centre for Immune Regulation, College of Medical and Dental Sciences, The University of Birmingham, Birmingham B15 2TT, UK
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Luu NT, Rahman M, Stone PC, Rainger GE, Nash GB. Responses of Endothelial Cells from Different Vessels to Inflammatory Cytokines and Shear Stress: Evidence for the Pliability of Endothelial Phenotype. J Vasc Res 2010; 47:451-61. [DOI: 10.1159/000302613] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2009] [Accepted: 11/07/2009] [Indexed: 11/19/2022] Open
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McGettrick HM, Filer A, Buckley CD, Rainger GE, Nash GB. Cross-talk between fibroblasts and endothelial cells influences the recruitment and retention of lymphocytes in a co-culture model of inflammation. Cytokine 2009. [DOI: 10.1016/j.cyto.2009.07.438] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Butler LM, Rainger GE, Nash GB. A role for the endothelial glycosaminoglycan hyaluronan in neutrophil recruitment by endothelial cells cultured for prolonged periods. Exp Cell Res 2009; 315:3433-41. [PMID: 19716819 PMCID: PMC2777247 DOI: 10.1016/j.yexcr.2009.08.012] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2009] [Revised: 08/11/2009] [Accepted: 08/21/2009] [Indexed: 01/10/2023]
Abstract
Glycosaminoglycans (GAGs) presented on the surface of endothelial cells (ECs) are believed to influence leukocyte recruitment during inflammation, but their roles remain uncertain. Here we report an in vitro model of prolonged culture of human EC in which the contributions of heparan sulphate (HS) and hyaluronan (HA) to the process of neutrophil recruitment could be studied. Previously, we reported that increasing EC culture duration (up to 20 days) enhanced neutrophil recruitment in response to low dose (1 U/ml) but not high dose (100 U/ml) of tumour necrosis factor-α (TNF). Here we found that HS and HA were present at much higher levels on the surface of day 20 cultures than day 3 cultures. Neutrophil recruitment on both day 3 and day 20 ECs was mediated through CXCR chemokine receptors and interleukin-8 (IL-8). In addition, mRNA levels for TNF receptors, signalling pathway constituents, adhesion receptors, and chemokines involved in neutrophil recruitment were similar for day 3 and day 20 ECs. To test whether the enhanced neutrophil recruitment on day 20 EC was mediated by GAGs, they were removed enzymatically. Removal of HA (but not HS) inhibited neutrophil recruitment, as did antibody blockade of CD44, a counter-receptor for HA on neutrophils. Supernatants from hyaluronidase-treated day 20 ECs were more potent in activating neutrophils than supernatants from untreated EC. Thus, HA has a role in neutrophil recruitment that is revealed in long-term cultures where it increases potency of response to sub-optimal levels of TNF. This effect appears to occur through a dual mechanism involving chemokine presentation and interaction with CD44.
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Affiliation(s)
- Lynn M Butler
- School of Clinical and Experimental Medicine, College of Medical and Dental Sciences, The Medical School, The University of Birmingham, Birmingham, UK.
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43
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Madden J, Shearman CP, Dunn RL, Dastur ND, Tan RM, Nash GB, Rainger GE, Brunner A, Calder PC, Grimble RF. Altered monocyte CD44 expression in peripheral arterial disease is corrected by fish oil supplementation. Nutr Metab Cardiovasc Dis 2009; 19:247-252. [PMID: 18804988 DOI: 10.1016/j.numecd.2008.06.011] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/11/2008] [Revised: 06/23/2008] [Accepted: 06/23/2008] [Indexed: 11/27/2022]
Abstract
BACKGROUND AND AIMS CD44 and its splice variants can be expressed on all leukocytes, conferring adhesive properties and enhancing cellular recruitment to the endothelium during inflammation. CD44 expression is increased in inflammatory conditions such as rheumatoid arthritis and CD44 variant 3 (CD44v3) expression may be associated with inflammation. We have examined CD44 and CD44v3 expression on peripheral blood monocytes from patients with peripheral arterial disease (PAD) and healthy controls. We have also examined the effect of fish oil supplementation on these markers. METHODS AND RESULTS CD44 and CD44v3 were assessed at baseline and following dietary supplementation with fish oil for 12 weeks in both PAD and control groups. Monocytes from PAD patients had higher CD44 expression than those from controls (median intensity fluorescence (MIF): 480+/-278 vs 336+/-251 (mean+/-SD); p<0.001). Following 12 weeks' dietary supplementation with fish oil, CD44 expression was reduced in PAD patients (MIF: 480+/-278 vs 427+/-262; p=0.05) but not in controls (336+/-251 vs 355+/-280; ns). Monocyte CD44v3 expression was lower in cultured monocytes from PAD patients compared to those from controls (0.15+/-0.15 vs 0.22+/-0.14 OD units; p<0.02). This was increased in the PAD group following fish oil supplementation (0.15+/-0.14 to 0.27+/-0.23 OD units; p<0.001). CONCLUSION Monocyte CD44 and CD44v3 expression are altered in arterial disease but are returned towards levels seen in control subjects by dietary fish oil supplementation.
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Affiliation(s)
- J Madden
- Institute of Human Nutrition, University of Southampton, Tremona Road,Southampton, UK.
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44
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McGettrick HM, Smith E, Filer A, Kissane S, Salmon M, Buckley CD, Rainger GE, Nash GB. Fibroblasts from different sites may promote or inhibit recruitment of flowing lymphocytes by endothelial cells. Eur J Immunol 2009; 39:113-25. [PMID: 19130557 PMCID: PMC2821685 DOI: 10.1002/eji.200838232] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
We examined the hypothesis that stromal fibroblasts modulate the ability of endothelial cells (EC) to recruit lymphocytes in a site-specific manner. PBL were perfused over HUVEC that had been cultured with fibroblasts isolated from the inflamed synovium or the skin of patients with rheumatoid arthritis or osteoarthritis, or from normal synovium, with or without exposure to the inflammatory cytokines TNF-alpha+IFN-gamma. Fibroblasts from inflamed synovium, but no others, caused unstimulated HUVEC to bind flowing lymphocytes. This adhesion was supported by alpha(4)beta(1)-VCAM-1 interaction and stabilised by activation of PBL through CXCR4-CXCL12. Antibody neutralisation of IL-6 during co-culture effectively abolished the ability of EC to bind lymphocytes. Cytokine-stimulated EC supported high levels of lymphocyte adhesion, through the presentation of VCAM-1, E-selectin and chemokine(s) acting through CXCR3. Interestingly, co-culture with dermal fibroblasts caused a marked reduction in cytokine-induced adhesion, while synovial fibroblasts had variable effects depending on their source. In the dermal co-cultures, neutralisation of IL-6 or TGF-beta caused partial recovery of cytokine-induced lymphocyte adhesion; this was complete when both were neutralised. Exogenous IL-6 was also found to inhibit response to TNF-alpha+IFN-gamma. Normal stromal fibroblasts appear to regulate the cytokine-sensitivity of vascular endothelium, while fibroblasts associated with chronic inflammation bypass this and develop a directly inflammatory phenotype. Actions of IL-6 might be pro-inflammatory or anti-inflammatory, depending on the local milieu.
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Affiliation(s)
- Helen M McGettrick
- Centre for Cardiovascular Sciences, The Medical School, The University of Birmingham, Birmingham, UK
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45
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McGettrick HM, Hunter K, Moss PA, Buckley CD, Rainger GE, Nash GB. Direct observations of the kinetics of migrating T cells suggest active retention by endothelial cells with continual bidirectional migration. J Leukoc Biol 2008; 85:98-107. [PMID: 18948550 PMCID: PMC2626767 DOI: 10.1189/jlb.0508301] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
The kinetics and regulatory mechanisms of T cell migration through the endothelium have not been fully defined. In experimental, filter-based assays in vitro, transmigration of lymphocytes takes hours, compared with minutes, in vivo. We cultured endothelial cell (EC) monolayers on filters, solid substrates, or collagen gels and treated them with TNF-α, IFN-γ, or both prior to analysis of lymphocyte migration in the presence or absence of flow. PBL, CD4+ cells, or CD8+ cells took many hours to migrate through EC-filter constructs for all cytokine treatments. However, direct microscopic observations of EC filters, which had been mounted in a flow chamber, showed that PBL crossed the endothelial monolayer in minutes and were highly motile in the subendothelial space. Migration through EC was also observed on clear plastic, with or without flow. After a brief settling without flow, PBL and isolated CD3+ or CD4+ cells crossed EC in minutes, but the numbers of migrated cells varied little with time. Close observation revealed that lymphocytes migrated back and forth continuously across endothelium. Under flow, migration kinetics and the proportions migrating back and forth were altered little. On collagen gels, PBL again crossed EC in minutes and migrated back and forth but showed little penetration of the gel over hours. In contrast, neutrophils migrated efficiently through EC and into gels. These observations suggest a novel model for lymphoid migration in which EC support migration but retain lymphocytes (as opposed to neutrophils), and additional signal(s) are required for onward migration.
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Affiliation(s)
- Helen M McGettrick
- The Medical School, The University of Birmingham, Birmingham B15 2TT, UK
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46
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Smith E, McGettrick HM, Stone MA, Shaw JS, Middleton J, Nash GB, Buckley CD, Ed Rainger G. Duffy antigen receptor for chemokines and CXCL5 are essential for the recruitment of neutrophils in a multicellular model of rheumatoid arthritis synovium. ACTA ACUST UNITED AC 2008; 58:1968-73. [PMID: 18576313 DOI: 10.1002/art.23545] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
OBJECTIVE The role of chemokines and their transporters in rheumatoid arthritis (RA) is poorly described. Evidence suggests that CXCL5 plays an important role, because it is abundant in RA tissue, and its neutralization moderates joint damage in animal models of arthritis. Expression of the chemokine transporter Duffy antigen receptor for chemokines (DARC) is also up-regulated in early RA. The aim of this study was to investigate the role of CXCL5 and DARC in regulating neutrophil recruitment, using an in vitro model of RA synovium. METHODS To model RA synovium, RA synovial fibroblasts (RASFs) were cocultured with endothelial cells (ECs) for 24 hours. Gene expression in cocultured cells was investigated using TaqMan gene arrays. The roles of CXCL5 and DARC were determined by incorporating cocultures into a flow-based adhesion assay, in which their function was demonstrated by blocking neutrophil recruitment with neutralizing reagents. RESULTS EC-RASF coculture induced chemokine expression in both cell types. Although the expression of CXC chemokines was modestly up-regulated in ECs, the expression of CXCL1, CXCL5, and CXCL8 was greatly increased in RASFs. RASFs also promoted the recruitment of flowing neutrophils to ECs. Anti-CXCL5 antibody abolished neutrophil recruitment by neutralizing CXCL5 expressed on ECs or when used to immunodeplete coculture-conditioned medium. DARC was also induced on ECs by coculture, and anti-Fy6 antibody or small interfering RNA targeting of DARC expression effectively abolished neutrophil recruitment. CONCLUSION This study is the first to demonstrate, in a model of human disease, that the function of DARC is essential for editing the chemokine signals presented by ECs and for promoting unwanted leukocyte recruitment.
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Affiliation(s)
- Emily Smith
- Department of Physiology, Medical School, University of Birmingham, Edgbaston, Birmingham, UK.
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Hampson P, Kavanagh D, Smith E, Wang K, Lord JM, Ed Rainger G. The anti-tumor agent, ingenol-3-angelate (PEP005), promotes the recruitment of cytotoxic neutrophils by activation of vascular endothelial cells in a PKC-delta dependent manner. Cancer Immunol Immunother 2008; 57:1241-51. [PMID: 18265980 PMCID: PMC11030169 DOI: 10.1007/s00262-008-0458-9] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2007] [Accepted: 01/13/2008] [Indexed: 11/25/2022]
Abstract
The modes of action of the novel anti-skin tumor agent ingenol-3-angelate (PEP005) are incompletely understood. Crucially, the cytotoxic functions of neutrophils recruited to the tumor in response to topical application of PEP005 are necessary for effective ablation of the treated lesion. Here, we investigated the hypothesis that the phorbol ester-like properties of PEP005 and its ability to activate PKC could directly activate endothelial cells (EC) so that they support the recruitment of neutrophils. Exposure of EC to PEP005 induced mRNA and/or protein for E-selectin, ICAM-1 and IL-8 in a dose dependent manner, while in a flow based adhesion assay, PEP005 treated EC supported the recruitment of neutrophils at levels comparable to EC stimulated with TNF-alpha. Neutrophil adhesion was inhibited by antibody against E-selectin but not P-selectin. Activation of EC was inhibited by the PKC inhibitor bisindolylmaleimide-1 and confocal immuno-fluorescent studies demonstrated translocation of PKC-delta from the cytosol to the peri-nuclear membrane in response to PEP005. Importantly, the knock down of PKC-delta using siRNA completely abolished neutrophil recruitment to EC subsequently treated with PEP005. Thus, we describe a novel route by which the anti-tumor agent PEP005 regulates the recruitment of cytotoxic leukocytes by directly activating EC in a PKC-delta dependent manner.
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Affiliation(s)
- Peter Hampson
- MRC Centre for Immune Regulation and Centre for Cardiovascular Sciences, The Institute for Biomedical Research, The Medical School, University of Birmingham, Birmingham, B15 2TT UK
| | - Dean Kavanagh
- MRC Centre for Immune Regulation and Centre for Cardiovascular Sciences, The Institute for Biomedical Research, The Medical School, University of Birmingham, Birmingham, B15 2TT UK
| | - Emily Smith
- MRC Centre for Immune Regulation and Centre for Cardiovascular Sciences, The Institute for Biomedical Research, The Medical School, University of Birmingham, Birmingham, B15 2TT UK
| | - Keqing Wang
- MRC Centre for Immune Regulation and Centre for Cardiovascular Sciences, The Institute for Biomedical Research, The Medical School, University of Birmingham, Birmingham, B15 2TT UK
| | - Janet M. Lord
- MRC Centre for Immune Regulation and Centre for Cardiovascular Sciences, The Institute for Biomedical Research, The Medical School, University of Birmingham, Birmingham, B15 2TT UK
| | - G. Ed Rainger
- MRC Centre for Immune Regulation and Centre for Cardiovascular Sciences, The Institute for Biomedical Research, The Medical School, University of Birmingham, Birmingham, B15 2TT UK
- Department of Physiology, The Medical School, University of Birmingham, Birmingham, B15 2TT UK
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Haworth O, Hardie DL, Burman A, Rainger GE, Eksteen B, Adams DH, Salmon M, Nash GB, Buckley CD. A role for the integrin alpha6beta1 in the differential distribution of CD4 and CD8 T-cell subsets within the rheumatoid synovium. Rheumatology (Oxford) 2008; 47:1329-34. [PMID: 18635598 DOI: 10.1093/rheumatology/ken263] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
OBJECTIVE CD4 and CD8 T-cell subsets accumulate in distinct microdomains within the inflamed rheumatoid synovium. The molecular basis for their differential distribution remains unclear. Since chemokines and adhesion molecules play an important role in the positioning of leucocytes at sites of inflammation, we tested the hypothesis that the differential expression and function of chemokine and/or adhesion molecules explains why CD4(+) T cells accumulate within perivascular cuffs, whereas CD8(+) T cells distribute diffusely within the tissue. METHODS Expression of an extensive panel of chemokine receptors and adhesion molecules on matched CD4(+) and CD8(+) T cells from peripheral blood (PB) and synovial fluid (SF) was analysed by multicolour flow cytometry. Migration assays and flow-based adhesion assays were used to assess the functional consequences of any differences in the expression of chemokine and adhesion receptors. RESULTS CD4(+) and CD8(+) T cells from PB and SF expressed unique yet consistent patterns of chemokine and adhesion receptors. SF CD8(+) T cells were much less promiscuous in their expression of chemokine receptors than SF CD4(+) T cells. The alpha(6)beta(1) integrin was highly expressed on PB CD4(+) T cells, but not on PB CD8(+) T cells. Laminin, the ligand for alpha(6)beta(1), retained CD4(+) T cells, but less so CD8(+) T cells, within inflamed synovial tissue. CONCLUSION Infiltrating PB CD4(+) T cells, but not CD8(+) T cells, express functional levels of the alpha(6)beta(1) integrin. We propose that this leads to their retention within the rheumatoid synovium in perivascular cuffs, which are defined and delineated by the expression of laminin.
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Affiliation(s)
- O Haworth
- Division of Immunity and Infection, University of Birmingham, Birmingham, UK
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49
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Luu NT, Madden J, Calder PC, Grimble RF, Shearman CP, Chan T, Dastur N, Howell WM, Rainger GE, Nash GB. Dietary supplementation with fish oil modifies the ability of human monocytes to induce an inflammatory response. J Nutr 2007; 137:2769-74. [PMID: 18029497 DOI: 10.1093/jn/137.12.2769] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Monocytes/macrophages are key orchestrators of inflammation and are involved in the pathogenesis of chronic inflammatory disorders, including atherosclerosis. (n-3) Fatty acids, found in fish oil, have been shown to have protective effects in such disorders. To investigate possible modes of action, we used a monocyte:endothelial cell (EC) coculture model to investigate the pro-inflammatory potential of monocytes. Monocytes were isolated from the blood of donors with peripheral arterial disease (PAD) or control donors, before and after a 12-wk supplementation of their diet with fish oil. The monocytes were cultured with human umbilical vein EC (HUVEC) for 24 h, after which the ability of the HUVEC to recruit flowing neutrophils was tested. Monocytes from either group of donors stimulated the EC to support the adhesion and migration of neutrophils. Fish oil supplementation reduced the potency of monocytes from normal subjects, but not those from patients with PAD, to induce recruitment. Concurrent medication may have acted as a complicating factor. On subgroup analysis, only those free of medication showed a significant effect of fish oil. Responses before or after supplementation were not closely linked to patterns of secretion of cytokines by cultured monocytes, tested in parallel monocultures. These results suggest that fish oil can modulate the ability of monocytes to stimulate EC and that this might contribute to their protective effects against chronic inflammatory disorders. Benefits, however, may depend on existing medical status and on other treatments being received.
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Affiliation(s)
- Nguyet-Thin Luu
- Centre for Cardiovascular Sciences, Department of Physiology, The Medical School, University of Birmingham, Birmingham, B15 2TT, UK
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50
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Luu NT, Madden J, Calder PC, Grimble RF, Shearman CP, Chan T, Tull SP, Dastur N, Rainger GE, Nash GB. Comparison of the pro-inflammatory potential of monocytes from healthy adults and those with peripheral arterial disease using an in vitro culture model. Atherosclerosis 2007; 193:259-68. [PMID: 16982061 DOI: 10.1016/j.atherosclerosis.2006.08.050] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/12/2005] [Revised: 08/16/2006] [Accepted: 08/24/2006] [Indexed: 10/24/2022]
Abstract
We adapted a monocyte:endothelial cell co-culture model to investigate the pro-inflammatory potential of monocytes from patients with peripheral arterial disease (PAD). Isolated monocytes were cultured with human umbilical vein endothelial cells (HUVEC) for 24h, after which the ability of the HUVEC to recruit flowing neutrophils was tested. Development of a usable protocol required comparisons of primary HUVEC with cells that had been passaged and/or frozen and thawed, evaluation of optimal culture media and comparison of monocytes from freshly drawn and stored blood. We found, for instance, that expansion of HUVEC was assisted by inclusion of hydrocortisone, but this agent was withdrawn before the test phase because it reduced responses of HUVEC. Using the optimal practical protocol, we found great variation in the ability of monocytes from different donors to cause neutrophil adhesion. Slightly more ( approximately 20%) monocytes from patients with PAD adhered to HUVEC than monocytes from healthy controls, and the monocytes from PAD patients induced approximately 70% greater subsequent adhesion of neutrophils. Thus, we developed a functional model of inflammatory potential usable in clinically-related studies and found that patients with PAD had circulating monocytes with greater than normal ability to activate endothelial cells.
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Affiliation(s)
- N T Luu
- Centre for Cardiovascular Sciences, Department of Physiology, Medical School, The University of Birmingham, Birmingham B15 2TT, UK
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