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Abstract
CD36 (also known as platelet glycoprotein IV) is expressed by a variety of different cell entities, where it possesses functions as a signaling receptor, but additionally acts as a transporter for long-chain fatty acids. This dual function of CD36 has been investigated for its relevance in immune and nonimmune cells. Although CD36 was first identified on platelets, the understanding of the role of CD36 in platelet biology remained scarce for decades. In the past few years, several discoveries have shed a new light on the CD36 signaling activity in platelets. Notably, CD36 has been recognized as a sensor for oxidized low-density lipoproteins in the circulation that mitigates the threshold for platelet activation under conditions of dyslipidemia. Thus, platelet CD36 transduces atherogenic lipid stress into an increased risk for thrombosis, myocardial infarction, and stroke. The underlying pathways that are affected by CD36 are the inhibition of cyclic nucleotide signaling pathways and simultaneously the induction of activatory signaling events. Furthermore, thrombospondin-1 secreted by activated platelets binds to CD36 and furthers paracrine platelet activation. CD36 also serves as a binding hub for different coagulation factors and, thus, contributes to the plasmatic coagulation cascade. This review provides a comprehensive overview of the recent findings on platelet CD36 and presents CD36 as a relevant target for the prevention of thrombotic events for dyslipidemic individuals with an elevated risk for thrombosis.
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Affiliation(s)
- Gerd Bendas
- Department of Pharmacy, University of Bonn, Bonn, Germany
| | - Martin Schlesinger
- Department of Pharmacy, University of Bonn, Bonn, Germany
- Federal Institute for Drugs and Medical Devices (BfArM), Bonn, Germany
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2
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Zhang Y, Dong D, Xu X, He H, Zhu Y, Lei T, Ou H. Oxidized high-density lipoprotein promotes CD36 palmitoylation and increases lipid uptake in macrophages. J Biol Chem 2022; 298:102000. [PMID: 35500650 PMCID: PMC9144050 DOI: 10.1016/j.jbc.2022.102000] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2022] [Revised: 04/21/2022] [Accepted: 04/22/2022] [Indexed: 02/02/2023] Open
Abstract
Oxidized high-density lipoprotein (oxHDL) reduces the ability of cells to mediate reverse cholesterol transport and also shows atherogenic properties. Palmitoylation of cluster of differentiation 36 (CD36), an important receptor mediating lipoprotein uptake, is required for fatty acid endocytosis. However, the relationship between oxHDL and CD36 has not been described in mechanistic detail. Here, we demonstrate using acyl-biotin exchange analysis that oxHDL activates CD36 by increasing CD36 palmitoylation, which promotes efficient uptake in macrophages. This modification increased CD36 incorporation into plasma lipid rafts and activated downstream signaling mediators, such as Lyn, Fyn, and c-Jun N-terminal kinase, which elicited enhanced oxHDL uptake and foam cell formation. Furthermore, blocking CD36 palmitoylation with the pharmacological inhibitor 2-bromopalmitate decreased cell surface translocation and lowered oxHDL uptake in oxHDL-treated macrophages. We verified these results by transfecting oxHDL-induced macrophages with vectors expressing wildtype or mutant CD36 (mCD36) in which the cytoplasmic palmitoylated cysteine residues were replaced. We show that cells containing mCD36 exhibited less palmitoylated CD36, disrupted plasma membrane trafficking, and reduced protein stability. Moreover, in ApoE−/−CD36−/− mice, lipid accumulation at the aortic root in mice receiving the mCD36 vector was decreased, suggesting that CD36 palmitoylation is responsible for lipid uptake in vivo. Finally, our data indicated that palmitoylation of CD36 was dependent on DHHC6 (Asp-His-His-Cys) acyltransferase and its cofactor selenoprotein K, which increased the CD36/caveolin-1 interaction and membrane targeting in cells exposed to oxHDL. Altogether, our study uncovers a causal link between oxHDL and CD36 palmitoylation and provides insight into foam cell formation and atherogenesis.
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Affiliation(s)
- Yun Zhang
- Department of Biochemistry and Molecular Biology, School of Basic Medical Science, Guizhou Medical University, Guiyang, Guizhou, China
| | - Doudou Dong
- Department of Biochemistry and Molecular Biology, School of Basic Medical Science, Guizhou Medical University, Guiyang, Guizhou, China
| | - Xiaoting Xu
- Department of Biochemistry and Molecular Biology, School of Basic Medical Science, Guizhou Medical University, Guiyang, Guizhou, China
| | - Hui He
- Department of Biochemistry and Molecular Biology, School of Basic Medical Science, Guizhou Medical University, Guiyang, Guizhou, China
| | - Yuan Zhu
- Department of Biochemistry and Molecular Biology, School of Basic Medical Science, Guizhou Medical University, Guiyang, Guizhou, China
| | - Tingwen Lei
- Department of Biochemistry and Molecular Biology, School of Basic Medical Science, Guizhou Medical University, Guiyang, Guizhou, China
| | - Hailong Ou
- Department of Biochemistry and Molecular Biology, School of Basic Medical Science, Guizhou Medical University, Guiyang, Guizhou, China.
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3
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Comprehensive Characterization of Platelet-Enriched MicroRNAs as Biomarkers of Platelet Activation. Cells 2022; 11:cells11081254. [PMID: 35455934 PMCID: PMC9030873 DOI: 10.3390/cells11081254] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Revised: 03/18/2022] [Accepted: 03/23/2022] [Indexed: 12/13/2022] Open
Abstract
Dysregulation of platelet function is causally connected to thrombus formation and cardiovascular diseases. Therefore, assessing platelet reactivity is crucial. However, current platelet function tests come with pitfalls, limiting clinical use. Plasma miRNA signatures have been suggested as novel biomarkers for predicting/diagnosing cardiovascular diseases and monitoring antiplatelet therapy. Here, we provide results from a comprehensive study on the feasibility of using circulatory platelet miRNAs as surrogate markers of platelet activation. We performed small RNA-Seq on different blood cell types to confirm known and identify novel platelet-enriched miRNAs and validated a panel of 16 miRNAs using RT-qPCR. To identify the main carrier of these blood-based platelet miRNAs, we enriched and analyzed distinct microvesicle populations. Platelets were stimulated with GPVI and P2Y12 agonists in vitro to monitor the release of the selected miRNAs following activation. Finally, the miRNA panel was also measured in plasma from mice undergoing the Folts intervention (recurrent thrombus formation in the carotid artery). Applying an unbiased bioinformatics-supported workflow to our NGS data, we were able to confirm a panel of previously established miRNA biomarker candidates and identify three new candidates (i.e., miR-199a-3p, miR-151a-5p, and miR-148b-3p). Basal levels of platelet-derived miRNAs in plasma were mainly complexed with proteins, not extracellular vesicles. We show that changes in miRNA levels due to platelet activation are detectable using RT-qPCR. In addition, we highlight limitations of studying the in vitro release of miRNAs from platelets. In vivo thrombosis resulted in significant elevations of platelet-derived miRNA levels in mice. In conclusion, we provide in-depth evidence that activated platelets release miRNAs, resulting in measurable changes in circulatory miRNA levels, rendering them promising biomarker candidates.
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Paes AMDA, Gaspar RS, Fuentes E, Wehinger S, Palomo I, Trostchansky A. Lipid Metabolism and Signaling in Platelet Function. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2019; 1127:97-115. [PMID: 31140174 DOI: 10.1007/978-3-030-11488-6_7] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Modern society has changed its diet composition, transitioning to a higher intake of saturated fat with a 50% increase of cardiovascular risk (CVD). Within the context of increased CVD, there is an induction of a prothrombotic phenotype mainly due to increased platelet reactivity as well as decreased platelet response to inhibitors. Platelets maintain haemostasis through both blood components and endothelial cells that secrete inhibitory or stimulatory molecules to regulate thrombus formation. There exist a correlation between platelets' polyunsaturated fatty acid (PUFA) and the increase in platelet reactivity. The aim of this chapter is to review the metabolism of the main PUFAs involved in platelet function associated with the role that their enzyme-derived oxidized metabolites exert in platelet function and fate. Finally, how lipid metabolism in the organism affect platelet aggregation and activation and the pharmacological modulation of these processes will also be discussed.
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Affiliation(s)
- Antonio Marcus de Andrade Paes
- Laboratory of Experimental Physiology, Department of Physiological Sciences, Federal University of Maranhão, São Luís, Brazil
| | - Renato Simões Gaspar
- Institute of Cardiovascular and Metabolic Research, University of Reading, Reading, UK
| | - Eduardo Fuentes
- Thrombosis Research Center, Department of Clinical Biochemistry and Immunohaematology, Faculty of Health Sciences, Interdisciplinary Excellence Research Program on Healthy Aging (PIEI-ES), Universidad de Talca, Talca, Chile
| | - Sergio Wehinger
- Thrombosis Research Center, Department of Clinical Biochemistry and Immunohaematology, Faculty of Health Sciences, Interdisciplinary Excellence Research Program on Healthy Aging (PIEI-ES), Universidad de Talca, Talca, Chile
| | - Iván Palomo
- Thrombosis Research Center, Department of Clinical Biochemistry and Immunohaematology, Faculty of Health Sciences, Interdisciplinary Excellence Research Program on Healthy Aging (PIEI-ES), Universidad de Talca, Talca, Chile
| | - Andrés Trostchansky
- Departamento de Bioquímica and Centro de Investigaciones Biomédicas (CEINBIO), Facultad de Medicina, Universidad de la República, Montevideo, Uruguay.
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Zahran AM, El-Badawy O, Mohamad IL, Tamer DM, Abdel-Aziz SM, Elsayh KI. Platelet Activation and Platelet-Leukocyte Aggregates in Type I Diabetes Mellitus. Clin Appl Thromb Hemost 2018; 24:230S-239S. [PMID: 30309255 PMCID: PMC6714843 DOI: 10.1177/1076029618805861] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Hyperglycemia alone may not explain the increased risk of cardiovascular diseases (CVDs)
in patients with type 1 diabetes (T1D) compared with type 2. This study emphases on the
evaluation of some platelet activity markers in patients with T1D, with relevance to some
metabolic disorders as hyperlipidemia and hyperglycemia. This study was performed on 35
patients with T1D and 20 healthy controls. All participants were subjected to full history
taking, clinical examination and assay of glycated hemoglobin (HbA1c), and
lipid profile. The expression of CD62P and CD36 on platelets and the frequency of
platelet–monocyte, and platelet–neutrophil aggregates were assessed by flow cytometry.
Patients showed significantly higher expression of CD62P and CD36 than the control group.
Platelets aggregates with monocytes were also higher among patients than the control
group. Levels of CD36+ platelets, CD62P+ platelets, and
platelet–monocyte aggregates revealed significant correlations with the levels of
HbA1c, total cholesterol, low-density lipoprotein, and triglycerides.
Hyperlipidemia and hyperglycemia accompanying T1D have a stimulatory effect on platelet
activation which probably makes those patients vulnerable to CVD than nondiabetics.
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Affiliation(s)
- Asmaa M Zahran
- Department of Clinical Pathology, South Egypt Cancer Institute, Assiut, Egypt
| | - Omnia El-Badawy
- Medical Microbiology and Immunology Department, Faculty of Medicine, Assiut University, Assiut, Egypt
| | - Ismail L Mohamad
- Pediatric Department, Faculty of Medicine, Assiut University, Assiut, Egypt
| | - Deiaaeldin M Tamer
- Pediatric Department, Faculty of Medicine, Assiut University, Assiut, Egypt
| | | | - Khalid I Elsayh
- Pediatric Department, Faculty of Medicine, Assiut University, Assiut, Egypt
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6
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Garcia C, Montée N, Faccini J, Series J, Meilhac O, Cantero AV, Le Faouder P, Elbaz M, Payrastre B, Vindis C. Acute coronary syndrome remodels the antiplatelet aggregation properties of HDL particle subclasses. J Thromb Haemost 2018; 16:933-945. [PMID: 29543379 DOI: 10.1111/jth.14003] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2017] [Indexed: 01/29/2023]
Abstract
Essentials HDL subclasses were studied in acute coronary syndrome (ACS). HDL2 from ACS patients have better antiplatelet potency than HDL from non ACS subjects. ACS remodels the antiplatelet properties of HDL subclasses. Oxidized polyunsaturated fatty acids content of HDL is modified by ACS. SUMMARY Background Although HDLs have antithrombotic effects by reducing platelet activation, the relationship between HDL levels and the risk of acute coronary syndrome (ACS) is unclear, as HDL particles are heterogeneous in composition and biological properties. Objective To characterize the effects of HDL2 and HDL3 subclasses from ACS patients and non-coronary artery disease (CAD) subjects on platelet activation. Methods We measured platelet aggregation and ex vivo thrombus formation, analyzed signaling pathways by flow cytometry, and performed a targeted lipidomics analysis on HDL subclasses. Results Analysis of human platelet aggregation in suspension, adhesion on von Willebrand factor and thrombus formation on collagen under arterial shear demonstrated that HDL2 from ACS patients had higher antiplatelet potency than HDL3 from ACS patients and HDL from non-CAD subjects. HDL binding to scavenger receptor class B type I was essential for this effect. A lipidomics analysis revealed that HDL2 from ACS patients had more oxidized polyunsaturated fatty acids (PUFAs). An inverse correlation between the concentrations of 9-hydroxyoctadecadienoic acid (9-HODE), 13-hydroxyoctadecadienoic acid (13-HODE), the eicosapentaenoic acid metabolite 18-hydroxyeicosapentaenoic acid (18-HEPE) and hydroxyeicosatetraenoic acid isomers in HDL2 and platelet aggregation was observed. This relationship was further demonstrated by the direct inhibitory effects of 18-HEPE, 9-HODE, 13-HODE, 17-hydroxydocosahexaenoic acid and 14-hydroxydocosahexaenoic acid on collagen-related peptide-induced platelet aggregation, indicating that oxidized PUFAs contribute to the antithrombotic effect of ACS HDL2. Conclusions Our data shed new light on the antiplatelet effects of HDL subclasses, and suggest physiological adaptation through the modulation of HDL properties in ACS patients that may limit their platelet-dependent thrombotic risk.
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Affiliation(s)
- C Garcia
- Laboratory of Hematology, CHU Toulouse, Toulouse, France
| | - N Montée
- Institute of Metabolic and Cardiovascular Diseases/I2MC, INSERM, UMR-1048 and University Toulouse 3, Toulouse, France
- INSERM, UMR-1188, Diabète Athérothrombose Thérapies Réunion Océan Indien, Université de la Réunion, Saint Denis, France
| | - J Faccini
- Institute of Metabolic and Cardiovascular Diseases/I2MC, INSERM, UMR-1048 and University Toulouse 3, Toulouse, France
| | - J Series
- Laboratory of Hematology, CHU Toulouse, Toulouse, France
| | - O Meilhac
- INSERM, UMR-1188, Diabète Athérothrombose Thérapies Réunion Océan Indien, Université de la Réunion, Saint Denis, France
| | - A-V Cantero
- Institute of Metabolic and Cardiovascular Diseases/I2MC, INSERM, UMR-1048 and University Toulouse 3, Toulouse, France
- Laboratory of Biochemistry, CHU Toulouse, Toulouse, France
| | - P Le Faouder
- MetaToul-Lipidomic Core Facility, MetaboHUB, INSERM, UMR-1048, Toulouse, France
| | - M Elbaz
- Institute of Metabolic and Cardiovascular Diseases/I2MC, INSERM, UMR-1048 and University Toulouse 3, Toulouse, France
- Department of Cardiology, CHU Toulouse, Toulouse, France
| | - B Payrastre
- Laboratory of Hematology, CHU Toulouse, Toulouse, France
- Institute of Metabolic and Cardiovascular Diseases/I2MC, INSERM, UMR-1048 and University Toulouse 3, Toulouse, France
| | - C Vindis
- Laboratory of Hematology, CHU Toulouse, Toulouse, France
- Institute of Metabolic and Cardiovascular Diseases/I2MC, INSERM, UMR-1048 and University Toulouse 3, Toulouse, France
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7
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Lipoproteins as modulators of atherothrombosis: From endothelial function to primary and secondary coagulation. Vascul Pharmacol 2016; 82:1-10. [DOI: 10.1016/j.vph.2015.10.009] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2015] [Revised: 10/23/2015] [Accepted: 10/26/2015] [Indexed: 12/20/2022]
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8
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Lê QH, El Alaoui M, Véricel E, Ségrestin B, Soulère L, Guichardant M, Lagarde M, Moulin P, Calzada C. Glycoxidized HDL, HDL enriched with oxidized phospholipids and HDL from diabetic patients inhibit platelet function. J Clin Endocrinol Metab 2015; 100:2006-14. [PMID: 25794249 PMCID: PMC4803888 DOI: 10.1210/jc.2014-4214] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
CONTEXT High-density lipoproteins (HDL) possess atheroprotective properties including anti-thrombotic and antioxidant effects. Very few studies relate to the functional effects of oxidized HDL on platelets in type 2 diabetes (T2D). OBJECTIVE The objective of our study was to investigate the effects of in vitro glycoxidized HDL and HDL from patients with T2D on platelet aggregation and arachidonic acid signaling cascade. At the same time, the contents of hydroxylated fatty acids were assessed in HDL. RESULTS Compared with control HDL, in vitro glycoxidized HDL had decreased proportions of linoleic (LA) and arachidonic (AA) acids in phospholipids and cholesteryl esters, and increased concentrations of hydroxy-octadecadienoic acids (9-HODE and 13-HODE) and 15-hydroxy-eicosatetraenoic acid (15-HETE), derived from LA and AA respectively, especially hydroxy derivatives esterified in phospholipids. Glycoxidized HDL dose-dependently decreased collagen-induced platelet aggregation by binding to scavenger receptor BI (SR-BI). Glycoxidized HDL prevented collagen-induced increased phosphorylation of platelet p38 MAPK and cytosolic phospholipase A2, as well as intracellular calcium mobilization. HDL enriched with oxidized phosphatidylcholine (PC), namely PC(16:0/13-HODE) dose-dependently inhibited platelet aggregation. Increased concentrations of 9-HODE, 13-HODE, and 15-HETE in phospholipids (2.1-, 2.1-, and 2.4-fold increase, respectively) were found in HDL from patients with T2D, and these HDL also inhibited platelet aggregation via SR-BI. CONCLUSIONS Our results suggest that in vitro glycoxidized HDL as well as HDL from patients with T2D inhibit platelet aggregation, and suggest that oxidized LA-containing phospholipids may contribute to the anti-aggregatory effects of glycoxidized HDL and HDL from patients with T2D.
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Affiliation(s)
- Quang Huy Lê
- CARMEN, Laboratoire de recherche en cardiovasculaire, métabolisme, diabétologie et nutrition
Université Claude Bernard Lyon 1Institut National des Sciences Appliquées LyonInstitut national de la recherche agronomique (INRA)INSERMHospices Civils de LyonFaculté de Médecine Lyon Sud - BP 12 - 165 Chemin du Grand Revoyet - 69921 Oullins cedex INSA, Bâtiment. IMBL, La Doua - 11 Avenue Jean Capelle - 69621 Villeurbanne Cedex
| | - Meddy El Alaoui
- ICBMS, Institut de Chimie et Biochimie Moléculaires et Supramoléculaires
Université Claude Bernard Lyon 1Institut National des Sciences Appliquées LyonÉcole Supérieure Chimie Physique Électronique de LyonCentre National de la Recherche ScientifiqueBâtiment CPE 43 Boulvard du 11 Novembre 1918 69622 Villeurbanne Cedex
| | - Evelyne Véricel
- CARMEN, Laboratoire de recherche en cardiovasculaire, métabolisme, diabétologie et nutrition
Université Claude Bernard Lyon 1Institut National des Sciences Appliquées LyonInstitut national de la recherche agronomique (INRA)INSERMHospices Civils de LyonFaculté de Médecine Lyon Sud - BP 12 - 165 Chemin du Grand Revoyet - 69921 Oullins cedex INSA, Bâtiment. IMBL, La Doua - 11 Avenue Jean Capelle - 69621 Villeurbanne Cedex
| | | | - Laurent Soulère
- ICBMS, Institut de Chimie et Biochimie Moléculaires et Supramoléculaires
Université Claude Bernard Lyon 1Institut National des Sciences Appliquées LyonÉcole Supérieure Chimie Physique Électronique de LyonCentre National de la Recherche ScientifiqueBâtiment CPE 43 Boulvard du 11 Novembre 1918 69622 Villeurbanne Cedex
| | - Michel Guichardant
- CARMEN, Laboratoire de recherche en cardiovasculaire, métabolisme, diabétologie et nutrition
Université Claude Bernard Lyon 1Institut National des Sciences Appliquées LyonInstitut national de la recherche agronomique (INRA)INSERMHospices Civils de LyonFaculté de Médecine Lyon Sud - BP 12 - 165 Chemin du Grand Revoyet - 69921 Oullins cedex INSA, Bâtiment. IMBL, La Doua - 11 Avenue Jean Capelle - 69621 Villeurbanne Cedex
| | - Michel Lagarde
- CARMEN, Laboratoire de recherche en cardiovasculaire, métabolisme, diabétologie et nutrition
Université Claude Bernard Lyon 1Institut National des Sciences Appliquées LyonInstitut national de la recherche agronomique (INRA)INSERMHospices Civils de LyonFaculté de Médecine Lyon Sud - BP 12 - 165 Chemin du Grand Revoyet - 69921 Oullins cedex INSA, Bâtiment. IMBL, La Doua - 11 Avenue Jean Capelle - 69621 Villeurbanne Cedex
| | - Philippe Moulin
- CARMEN, Laboratoire de recherche en cardiovasculaire, métabolisme, diabétologie et nutrition
Université Claude Bernard Lyon 1Institut National des Sciences Appliquées LyonInstitut national de la recherche agronomique (INRA)INSERMHospices Civils de LyonFaculté de Médecine Lyon Sud - BP 12 - 165 Chemin du Grand Revoyet - 69921 Oullins cedex INSA, Bâtiment. IMBL, La Doua - 11 Avenue Jean Capelle - 69621 Villeurbanne Cedex
- Fédération d'Endocrinologie
Hospices Civils de Lyon69677 Lyon Bron
| | - Catherine Calzada
- CARMEN, Laboratoire de recherche en cardiovasculaire, métabolisme, diabétologie et nutrition
Université Claude Bernard Lyon 1Institut National des Sciences Appliquées LyonInstitut national de la recherche agronomique (INRA)INSERMHospices Civils de LyonFaculté de Médecine Lyon Sud - BP 12 - 165 Chemin du Grand Revoyet - 69921 Oullins cedex INSA, Bâtiment. IMBL, La Doua - 11 Avenue Jean Capelle - 69621 Villeurbanne Cedex
- * Correspondence should be addressed to Catherine Calzada
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9
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Wu J, He Z, Gao X, Wu F, Ding R, Ren Y, Jiang Q, Fan M, Liang C, Wu Z. Oxidized high-density lipoprotein impairs endothelial progenitor cells' function by activation of CD36-MAPK-TSP-1 pathways. Antioxid Redox Signal 2015; 22:308-24. [PMID: 25313537 PMCID: PMC4298149 DOI: 10.1089/ars.2013.5743] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
AIMS High-density lipoprotein (HDL) levels inversely correlate with cardiovascular events due to the protective effects on vascular wall and stem cells, which are susceptible to oxidative modifications and then lead to potential pro-atherosclerotic effects. We proposed that oxidized HDL (ox-HDL) might lead to endothelial progenitor cells (EPCs) dysfunction and investigated underlying mechanisms. RESULTS ox-HDL was shown to increase apoptosis and intracellular reactive oxygen species levels, but to reduce migration, angiogenesis, and cholesterol efflux of EPCs in a dose-dependent manner. p38 mitogen-activated protein kinase (MAPK) and NF-κB were activated after ox-HDL stimulation, which also upregulated thrombospondin-1 (TSP-1) expression without affecting vascular endothelial growth factor. Effects caused by ox-HDL could be significantly attenuated by pretreatment with short hairpin RNA-mediated CD36 knockdown or probucol. Data of in vivo experiments and the inverse correlation of ox-HDL and circulating EPC numbers among patients with coronary artery diseases (CAD) or CAD and type 2 diabetes also supported it. Meanwhile, HDL separated from such patients could significantly increase cultured EPC's caspase 3 activity, further supporting our proposal. INNOVATION This is the most complete study to date of how ox-HDL would impair EPCs function, which was involved with activation of CD36-p38 MAPK-TSP-1 pathways and proved by not only the inverse relationship between ox-HDL and circulating EPCs in clinic but also pro-apoptotic effects of HDL separated from patients' serum. CONCLUSION Activation of CD36-p38 MAPK-TSP-1 pathways contributes to the pathological effects of ox-HDL on EPCs' dysfunction, which might be one of the potential etiological factors responsible for the disturbed neovascularization in chronic ischemic disease.
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Affiliation(s)
- Jianxiang Wu
- Department of Cardiology, Shanghai Changzheng Hospital, Second Military Medical University, Shanghai, People's Republic of China
- Department of Geriatrics, No. 411 Hospital of People's Liberation Army, Shanghai, People's Republic of China
| | - Zhiqing He
- Department of Cardiology, Shanghai Changzheng Hospital, Second Military Medical University, Shanghai, People's Republic of China
| | - Xiang Gao
- Department of Nephrology, Shanghai Changzheng Hospital, Second Military Medical University, Shanghai, People's Republic of China
| | - Feng Wu
- Department of Cardiology, Shanghai Changzheng Hospital, Second Military Medical University, Shanghai, People's Republic of China
- Department of Research, Center for Stem Cell Biology, Roger Williams Medical Center, Boston University School of Medicine, Providence, Rhode Island
| | - Ru Ding
- Department of Cardiology, Shanghai Changzheng Hospital, Second Military Medical University, Shanghai, People's Republic of China
| | - Yusheng Ren
- Department of Cardiology, Shanghai Changzheng Hospital, Second Military Medical University, Shanghai, People's Republic of China
| | - Qijun Jiang
- Department of Cardiology, Shanghai Changzheng Hospital, Second Military Medical University, Shanghai, People's Republic of China
| | - Min Fan
- Department of Cardiology, Shanghai Changzheng Hospital, Second Military Medical University, Shanghai, People's Republic of China
| | - Chun Liang
- Department of Cardiology, Shanghai Changzheng Hospital, Second Military Medical University, Shanghai, People's Republic of China
| | - Zonggui Wu
- Department of Cardiology, Shanghai Changzheng Hospital, Second Military Medical University, Shanghai, People's Republic of China
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10
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Chan LW, Luo XP, Ni HC, Shi HM, Liu L, Wen ZC, Gu XY, Qiao J, Li J. High levels of LDL-C combined with low levels of HDL-C further increase platelet activation in hypercholesterolemic patients. ACTA ACUST UNITED AC 2014; 48:167-73. [PMID: 25466164 PMCID: PMC4321223 DOI: 10.1590/1414-431x20144182] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2014] [Accepted: 09/09/2014] [Indexed: 01/31/2023]
Abstract
High levels of low-density lipoprotein cholesterol (LDL-C) enhance platelet
activation, whereas high levels of high-density lipoprotein cholesterol (HDL-C) exert
a cardioprotective effect. However, the effects on platelet activation of high levels
of LDL-C combined with low levels of HDL-C (HLC) have not yet been reported. We aimed
to evaluate the platelet activation marker of HLC patients and investigate the
antiplatelet effect of atorvastatin on this population. Forty-eight patients with
high levels of LDL-C were enrolled. Among these, 23 had HLC and the other 25 had high
levels of LDL-C combined with normal levels of HDL-C (HNC). A total of 35
normocholesterolemic (NOMC) volunteers were included as controls. Whole blood flow
cytometry and platelet aggregation measurements were performed on all participants to
detect the following platelet activation markers: CD62p (P-selectin), PAC-1
(GPIIb/IIIa), and maximal platelet aggregation (MPAG). A daily dose of 20 mg
atorvastatin was administered to patients with high levels of LDL-C, and the above
assessments were obtained at baseline and after 1 and 2 months of treatment. The
expression of platelets CD62p and PAC-1 was increased in HNC patients compared to
NOMC volunteers (P<0.01 and P<0.05). Furthermore, the surface expression of
platelets CD62p and PAC-1 was greater among HLC patients than among HNC patients
(P<0.01 and P<0.05). Although the expression of CD62p and PAC-1 decreased
significantly after atorvastatin treatment, it remained higher in the HLC group than
in the HNC group (P<0.05 and P=0.116). The reduction of HDL-C further increased
platelet activation in patients with high levels of LDL-C. Platelet activation
remained higher among HLC patients regardless of atorvastatin treatment.
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Affiliation(s)
- L W Chan
- Department of Cardiology, Huashan Hospital, Fudan University, Shanghai, China
| | - X P Luo
- Department of Cardiology, Huashan Hospital, Fudan University, Shanghai, China
| | - H C Ni
- Department of Cardiology, Huashan Hospital, Fudan University, Shanghai, China
| | - H M Shi
- Department of Cardiology, Huashan Hospital, Fudan University, Shanghai, China
| | - L Liu
- Department of Cardiology, Huashan Hospital, Fudan University, Shanghai, China
| | - Z C Wen
- Department of Cardiology, Huashan Hospital, Fudan University, Shanghai, China
| | - X Y Gu
- Department of Laboratory Medicine, Huashan Hospital, Fudan University, Shanghai, China
| | - J Qiao
- Department of Neurology, Huashan Hospital, Fudan University, Shanghai, China
| | - J Li
- Department of Cardiology, Huashan Hospital, Fudan University, Shanghai, China
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11
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van der Stoep M, Korporaal SJA, Van Eck M. High-density lipoprotein as a modulator of platelet and coagulation responses. Cardiovasc Res 2014; 103:362-71. [DOI: 10.1093/cvr/cvu137] [Citation(s) in RCA: 90] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
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12
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Assinger A, Wang Y, Butler LM, Hansson GK, Yan ZQ, Söderberg-Nauclér C, Ketelhuth DFJ. Apolipoprotein B100 danger-associated signal 1 (ApoBDS-1) triggers platelet activation and boosts platelet-leukocyte proinflammatory responses. Thromb Haemost 2014; 112:332-41. [PMID: 24816772 DOI: 10.1160/th13-12-1026] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2013] [Accepted: 03/20/2014] [Indexed: 12/21/2022]
Abstract
Low-density lipoproteins (LDL), occurring in vivo in both their native and oxidative form, modulate platelet function and thereby contribute to atherothrombosis. We recently identified and demonstrated that 'ApoB100 danger-associated signal 1' (ApoBDS-1), a native peptide derived from Apolipoprotein B-100 (ApoB100) of LDL, induces inflammatory responses in innate immune cells. Platelets are critically involved in the development as well as in the lethal consequences of atherothrombotic diseases, but whether ApoBDS-1 has also an impact on platelet function is unknown. In this study we examined the effect of ApoBDS-1 on human platelet function and platelet-leukocyte interactions in vitro. Stimulation with ApoBDS-1 induced platelet activation, degranulation, adhesion and release of proinflammatory cytokines. ApoBDS-1-stimulated platelets triggered innate immune responses by augmenting leukocyte activation, adhesion and transmigration to/through activated HUVEC monolayers, under flow conditions. These platelet-activating effects were sequence-specific, and stimulation of platelets with ApoBDS-1 activated intracellular signalling pathways, including Ca2+, PI3K/Akt, PLC, and p38- and ERK-MAPK. Moreover, our data indicates that ApoBDS-1-induced platelet activation is partially dependent of positive feedback from ADP on P2Y1 and P2Y12, and TxA2. In conclusion, we demonstrate that ApoBDS-1 is an effective platelet agonist, boosting platelet-leukocyte's proinflammatory responses, and potentially contributing to the multifaceted inflammatory-promoting effects of LDL in the pathogenesis of atherothrombosis.
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Affiliation(s)
- A Assinger
- Dr. Alice Assinger, Institute of Physiology, Center for Physiology and Pathophysiology, Medical University of Vienna, Schwarzspanierstrasse 17, A-1090 Vienna, Austria, E-mail:
| | | | | | | | | | | | - D F J Ketelhuth
- Dr. Daniel FJ Ketelhuth, Cardiovascular Research Unit, Center for Molecular Medicine, L8:03, Karolinska University Hospital, S-17176 Stockholm, Sweden, Fax: +46 8 313147, E-mail:
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13
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Gründemann C, Thell K, Lengen K, Garcia-Käufer M, Huang YH, Huber R, Craik DJ, Schabbauer G, Gruber CW. Cyclotides Suppress Human T-Lymphocyte Proliferation by an Interleukin 2-Dependent Mechanism. PLoS One 2013; 8:e68016. [PMID: 23840803 PMCID: PMC3694003 DOI: 10.1371/journal.pone.0068016] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2013] [Accepted: 05/24/2013] [Indexed: 02/07/2023] Open
Abstract
Cyclotides are a diverse and abundant group of ribosomally synthesized plant peptides containing a unique cyclic cystine-knotted topology that confers them with remarkable stability. Kalata B1, a representative member of this family of mini-proteins, has been found to inhibit the proliferation of human peripheral blood mononuclear cells. Analysis of T-cell proliferation upon treatment with chemically synthesized kalata B1 mutants revealed a region comprising inter-cysteine loops 1 and 2 of the cyclotide framework to be important for biological activity. Cytokine signaling analysis using an 'active' kalata B1 mutant [T20K], and the reference drug cyclosporin A (CsA) demonstrated that treatment of activated T-lymphocytes with these compounds decreased the expression of the interleukin-2 (IL-2) surface receptor as well as IL-2 cytokine secretion and IL-2 gene expression, whereas the 'inactive' kalata B1 mutant [V10K] did not cause any effects. The anti-proliferative activity of [T20K] kalata B1 was antagonized by addition of exogenous IL-2. Furthermore, treatment with [T20K] kalata B1 led to an initial reduction of the effector function, as indicated by the reduced IFN-γ and TNF-α production, but the levels of both cytokines stabilized over time and returned to their normal levels. On the other hand, the degranulation activity remained reduced. This indicated that cyclotides interfere with T-cell polyfunctionality and arrest the proliferation of immune-competent cells through inhibiting IL-2 biology at more than one site. The results open new avenues to utilize native and synthetically-optimized cyclotides for applications in immune-related disorders and as immunosuppressant peptides.
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Affiliation(s)
- Carsten Gründemann
- Center for Physiology and Pharmacology, Medical University of Vienna, Vienna, Austria
- Center for Complementary Medicine, Department of Environmental Health Sciences, University Medical Center Freiburg, Freiburg, Germany
| | - Kathrin Thell
- Center for Physiology and Pharmacology, Medical University of Vienna, Vienna, Austria
| | - Karin Lengen
- Center for Complementary Medicine, Department of Environmental Health Sciences, University Medical Center Freiburg, Freiburg, Germany
| | - Manuel Garcia-Käufer
- Center for Complementary Medicine, Department of Environmental Health Sciences, University Medical Center Freiburg, Freiburg, Germany
| | - Yen-Hua Huang
- Institute for Molecular Bioscience, the University of Queensland, Brisbane, Queensland, Australia
| | - Roman Huber
- Center for Complementary Medicine, Department of Environmental Health Sciences, University Medical Center Freiburg, Freiburg, Germany
| | - David J. Craik
- Institute for Molecular Bioscience, the University of Queensland, Brisbane, Queensland, Australia
| | - Gernot Schabbauer
- Center for Physiology and Pharmacology, Medical University of Vienna, Vienna, Austria
| | - Christian W. Gruber
- Center for Physiology and Pharmacology, Medical University of Vienna, Vienna, Austria
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14
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Native high density lipoproteins (HDL) interfere with platelet activation induced by oxidized low density lipoproteins (OxLDL). Int J Mol Sci 2013; 14:10107-21. [PMID: 23665908 PMCID: PMC3676831 DOI: 10.3390/ijms140510107] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2013] [Revised: 04/16/2013] [Accepted: 04/29/2013] [Indexed: 01/03/2023] Open
Abstract
Platelets and lipoproteins play a crucial role in atherogenesis, in part by their ability to modulate inflammation and oxidative stress. While oxidized low density lipoproteins (OxLDL) play a central role in the development of this disease, high density lipoproteins (HDL) represent an atheroprotective factor of utmost importance. As platelet function is remarkably sensitive to the influence of plasma lipoproteins, it was the aim of this study to clarify if HDL are able to counteract the stimulating effects of OxLDL with special emphasis on aspects of platelet function that are relevant to inflammation. Therefore, HDL were tested for their ability to interfere with pro-thrombotic and pro-inflammatory aspects of platelet function. We are able to show that HDL significantly impaired OxLDL-induced platelet aggregation and adhesion. In gel-filtered platelets, HDL decreased both the formation of reactive oxygen species and CD40L expression. Furthermore, HDL strongly interfered with OxLDL-induced formation of platelet-neutrophil aggregates in whole blood, suggesting that platelets represent a relevant and sensitive target for HDL. The finding that HDL effectively competed with the binding of OxLDL to the platelet surface might contribute to their atheroprotective and antithrombotic properties.
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15
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Calzada C, Véricel E, Colas R, Guillot N, El Khoury G, Drai J, Sassolas A, Peretti N, Ponsin G, Lagarde M, Moulin P. Inhibitory effects of in vivo oxidized high-density lipoproteins on platelet aggregation: evidence from patients with abetalipoproteinemia. FASEB J 2013; 27:2855-61. [PMID: 23507868 DOI: 10.1096/fj.12-225169] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
There is evidence that high-density lipoproteins (HDLs) may regulate platelet function, but disparate results exist regarding the effects of oxidized HDLs on platelets. The objective of our study was to determine the role of in vivo oxidized HDLs on platelet aggregation. Platelet aggregation and redox status were investigated in 5 patients with abetalipoproteinemia (ABLP) or homozygous hypobetalipoproteinemia, two rare metabolic diseases characterized by the absence of apolipoprotein B-containing lipoproteins, compared to 5 control subjects. Platelets isolated from plasma of patients with ABLP aggregated 4 to 10 times more than control platelets, depending on the agonist. By contrast, no differences in the extent of platelet aggregation were observed between ABLP platelet-rich plasma (PRP) and control PRP, suggesting the presence of a protective factor in ABLP plasma. ABLP HDLs inhibited agonist-induced platelet aggregation by binding to SR-BI, while control HDLs had no effect. On the other hand, lipoprotein-deficient plasma from patients with ABLP did not inhibit platelet aggregation. Severe oxidative stress was evidenced in patients with ABLP. Compared to control HDLs, ABLP HDLs showed a 40% decrease of α-tocopherol and an 11-fold increased malondialdehyde concentration. These results demonstrate that in vivo oxidized HDLs do not lose their antiaggregatory properties despite oxidation.
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Affiliation(s)
- Catherine Calzada
- Université de Lyon, Institut National de la Santé et de la Recherche Médicale (INSERM), Unité Mixte de Recherche (UMR) 1060, Cardiovasculaire, Métabolisme, Diabétologie, et Nutrition (CarMeN) Laboratory, Villeurbanne, France.
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16
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Talens S, Malfliet JJMC, Leebeek FWG, Rijken DC. Oxidized high-density lipoprotein reduces blood clot firmness. J Thromb Haemost 2013; 11:561-3. [PMID: 23294903 DOI: 10.1111/jth.12125] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2012] [Accepted: 12/23/2012] [Indexed: 11/28/2022]
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17
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Secretome of apoptotic peripheral blood cells (APOSEC) attenuates microvascular obstruction in a porcine closed chest reperfused acute myocardial infarction model: role of platelet aggregation and vasodilation. Basic Res Cardiol 2012; 107:292. [PMID: 22899170 PMCID: PMC3442164 DOI: 10.1007/s00395-012-0292-2] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/04/2011] [Revised: 07/02/2012] [Accepted: 07/17/2012] [Indexed: 12/12/2022]
Abstract
Although epicardial blood flow can be restored by an early intervention in most cases, a lack of adequate reperfusion at the microvascular level is often a limiting prognostic factor of acute myocardial infarction (AMI). Our group has recently found that paracrine factors secreted from apoptotic peripheral blood mononuclear cells (APOSEC) attenuate the extent of myocardial injury. The aim of this study was to determine the influence of APOSEC on microvascular obstruction (MVO) in a porcine AMI model. A single dose of APOSEC was intravenously injected in a closed chest reperfused infarction model. MVO was determined by magnetic resonance imaging and cardiac catheterization. Role of platelet function and vasodilation were monitored by means of ELISA, flow cytometry, aggregometry, western blot and myographic experiments in vitro and in vivo. Treatment of AMI with APOSEC resulted in a significant reduction of MVO. Platelet activation markers were reduced in plasma samples obtained during AMI, suggesting an anti-aggregatory capacity of APOSEC. This finding was confirmed by in vitro tests showing that activation and aggregation of both porcine and human platelets were significantly impaired by co-incubation with APOSEC, paralleled by vasodilator-stimulated phosphoprotein (VASP)-mediated inhibition of platelets. In addition, APOSEC evidenced a significant vasodilatory capacity on coronary arteries via p-eNOS and iNOS activation. Our data give first evidence that APOSEC reduces the extent of MVO during AMI, and suggest that modulation of platelet activation and vasodilation in the initial phase after myocardial infarction contributes to the improved long-term outcome in APOSEC treated animals.
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Periodontopathogens induce expression of CD40L on human platelets via TLR2 and TLR4. Thromb Res 2012; 130:e73-8. [PMID: 22608210 DOI: 10.1016/j.thromres.2012.04.017] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2012] [Revised: 04/20/2012] [Accepted: 04/26/2012] [Indexed: 11/22/2022]
Abstract
INTRODUCTION The outstanding importance of (soluble) CD40L to cardiovascular disease (CVD) is becoming increasingly apparent as CD40L is an important mediator of thrombotic and inflammatory processes. Platelets are the main source for CD40 ligand, linking platelet stimulatory events to inflammation and adverse adaptive immune responses. Periodontitis represents a chronic dental infection by distinct gram negative bacteria that is associated with an increased risk for CVD. However, the effects of periodontopathogens on CD40L expression by platelets have not been determined. MATERIAL AND METHODS Effects of periodontopathogens A. actinomycetemcomitans Y and P. gingivalis on the expression of CD40L were determined and the underlying receptors and pathways were investigated. 26 patients with periodontitis and 19 controls were included in the clinical part of this study. RESULTS Periodontopathogens directly induce surface expression of CD40L in human platelets. This activation depends on plasma factors like CD14 and involves TLR2 and TLR4 but not FcγRII. Inhibition of PI3K and PLC completely abolishes bacteria-induced surface expression of CD40L. TLR2 and TLR4 agonists, for example, are also able to induce expression and release of CD40L in human platelets. In patients with periodontitis, plasma levels of soluble CD40L are elevated and positivity for P. gingivalis is associated with a statistical significant increase of soluble CD40L. CONCLUSIONS Our data indicate an involvement of periodontopathogens in increased plasma levels of soluble CD40L in periodontitis and therefore provide a novel link between periodontitis and increased risk for CVD.
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Abstract
PURPOSE OF REVIEW HDL cholesterol levels have been inversely correlated with thrombosis and HDL has been shown to mediate various antithrombotic effects. However, molecular mechanisms underlying the suppressing effect of HDL on platelet reactivity are not completely understood. The present review summarizes the recent advancements in understanding the role played by scavenger receptor class B type I (SR-BI) - an HDL receptor - in modulating platelet function and mediating platelet-HDL interactions. RECENT FINDINGS SR-BI is expressed on platelet surface and platelets from SR-BI knockout animals are characterized by increased free-to-total cholesterol ratio, abnormal morphology, increased reactivity to strong platelets agonists, enhanced adherence to immobilized fibrinogen, and a propensity to form arterial thrombi. Crossover incubation experiments and a bone marrow transplantation approach reveal increased wild-type platelet reactivity in plasma from SR-BI mice and normal or decreased SR-BI-deficient platelet reactivity in wild-type plasma. A similar functional platelet phenotype has been observed in human carriers of an SR-BI genetic variant. SR-BI ligands interfere with HDL binding to murine platelets and impede the agonist-induced platelet activation as effectively as native HDL. The inhibitory effects of native HDL, moderately oxidized HDL, and SR-BI ligands are abolished in SR-BI-deficient platelets but not in CD36-deficient platelets. SUMMARY SR-BI exerts an indirect influence on platelet reactivity via maintaining normal plasma cholesterol homeostasis. In addition, SR-BI is a functional receptor for native and moderately oxidized HDL on platelets that generates an inhibitory signal for platelet activation.
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Affiliation(s)
- Jerzy-Roch Nofer
- Center for Laboratory Medicine, University Hospital Münster, Münster, Germany.
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20
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Brodde MF, Korporaal SJ, Herminghaus G, Fobker M, Van Berkel TJ, Tietge UJ, Robenek H, Van Eck M, Kehrel BE, Nofer JR. Native high-density lipoproteins inhibit platelet activation via scavenger receptor BI. Atherosclerosis 2011; 215:374-82. [DOI: 10.1016/j.atherosclerosis.2010.12.026] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/25/2010] [Revised: 12/14/2010] [Accepted: 12/27/2010] [Indexed: 10/18/2022]
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21
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Assinger A, Laky M, Schabbauer G, Hirschl AM, Buchberger E, Binder BR, Volf I. Efficient phagocytosis of periodontopathogens by neutrophils requires plasma factors, platelets and TLR2. J Thromb Haemost 2011; 9:799-809. [PMID: 21251195 DOI: 10.1111/j.1538-7836.2011.04193.x] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
BACKGROUND Periodontitis represents a chronic infection of supportive dental tissues by distinct gram-negative bacteria. It is characterized by chronic and local inflammation as well as transient bacteremia with frequently occurring infections at distant sites. OBJECTIVES The present work aimed to clarify the role of platelets and plasma factors in neutrophil interactions with the periodontopathogens A. actinomycetemcomitans and P. gingivalis. METHODS Phagocytosis, cell-cell interactions and activation of platelets and neutrophils in response to periodontopathogens were analyzed by flow cytometry, confocal microscopy and bacteria survival assay. Plasma factors, platelet signaling pathways and receptors involved in platelet-neutrophil-bacteria interactions were determined. The role of platelet and neutrophil TLR2 in phagocytosis was further evaluated in a murine TLR2 knockout model. RESULTS In the presence of plasma neutrophil-mediated clearance of periodontopathogens is doubled due to opsonisation of bacteria. Platelets, which become activated by periodontopathogens, further enhance clearance of bacteria by 20%, via direct interaction with neutrophils. Plasma factors (e.g. CD14) are required for platelet activation, which is mainly TLR2 dependent and results in PI3K/Akt activation. In a murine TLR2 knockout model we prove that platelet TLR2 is important for formation of platelet-neutrophil aggregates and enhanced phagocytosis of periodontopathogens. In contrast, neutrophil TLR2 is not involved in platelet-neutrophil aggregate formation but is required for efficient phagocytosis. CONCLUSIONS These data indicate that efficient elimination of periodontopathogens by neutrophils involves a complex interplay of plasma factors as well as platelets and requires functional TLR2. By enhancing neutrophil activation platelets contribute to immune defense but may also foster inflammation.
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Affiliation(s)
- A Assinger
- Institute of Physiology, Centre for Physiology and Pharmacology, Medical University of Vienna, Vienna, Austria.
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22
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Korporaal SJA, Meurs I, Hauer AD, Hildebrand RB, Hoekstra M, Cate HT, Praticò D, Akkerman JWN, Van Berkel TJC, Kuiper J, Van Eck M. Deletion of the high-density lipoprotein receptor scavenger receptor BI in mice modulates thrombosis susceptibility and indirectly affects platelet function by elevation of plasma free cholesterol. Arterioscler Thromb Vasc Biol 2010; 31:34-42. [PMID: 21051668 DOI: 10.1161/atvbaha.110.210252] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
OBJECTIVE Scavenger receptor BI (SR-BI) is a cell surface receptor that promotes the selective uptake of cholesteryl esters from high-density lipoprotein (HDL) by the liver. In mice, SR-BI deficiency results in increased plasma HDL cholesterol levels and enhanced susceptibility to atherosclerosis. The aim of this study was to investigate the role of SR-BI deficiency on platelet function. METHODS AND RESULTS SR-BI-deficient mice were thrombocytopenic, and their platelets were abnormally large, probably because of an increased cholesterol content. The FeCl(3) acute injury model to study arterial thrombosis susceptibility showed that SR-BI wild-type mice developed total arterial occlusion after 24±2 minutes. In SR-BI-deficient mice, however, the time to occlusion was reduced to 13±1 minutes (P=0.02). Correspondingly, in SR-BI-deficient mice, platelets circulated in an activated state and showed increased adherence to immobilized fibrinogen. In contrast, platelet-specific disruption of SR-BI by bone marrow transplantation in wild-type mice did not alter plasma cholesterol levels or affect platelet count, size, cholesterol content, or reactivity, suggesting that changes in plasma cholesterol levels were responsible for the altered responsiveness of platelets in SR-BI-deficient mice. CONCLUSIONS The function of SR-BI in HDL cholesterol homeostasis and prevention of atherosclerosis is indirectly also essential for maintaining normal platelet function and prevention of thrombosis.
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Affiliation(s)
- Suzanne J A Korporaal
- Leiden/Amsterdam Center for Drug Research, Division of Biopharmaceutics, Gorlaeus Laboratories, Einsteinweg 55, 2333 CC, Leiden, the Netherlands.
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Zhang M, Gao X, Wu J, Liu D, Cai H, Fu L, Mei C. Oxidized high-density lipoprotein enhances inflammatory activity in rat mesangial cells. Diabetes Metab Res Rev 2010; 26:455-63. [PMID: 20623482 DOI: 10.1002/dmrr.1102] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
AIMS Inflammation is a mechanism of glomerular damage in chronic glomerulopathies, in which dyslipidaemia plays an important role. Unlike native high-density lipoprotein (HDL), oxidized HDL is thought to be an adverse factor in chronic ischaemic disease and may increase the production of inflammatory cytokines in atheromatous plaques and plasma, but the effect of oxidized HDL on mesangial cells remains unclear. METHODS Intracellular reactive oxygen species level was measured. The inflammatory and proapoptotic effects of oxidized HDL were detected in rat mesangial cells by measuring levels of tumour necrosis factor-alpha, regulated upon activation, normal T-cell expressed and secreted, monocyte chemoattractant protein-1, CXC chemokine ligand-1 and early apoptosis. The expression of mitogen-activated protein kinase (MAPK) (p38/MAPK, extracellular-regulated kinase/MAPK and c-Jun N-terminal kinase/MAPK), nuclear factor-kappaB activity and lipoprotein scavenger receptors (CD36, low-density lipoprotein receptor-1 and scavenger receptor BI) were also detected. RESULTS Oxidized HDL enhanced reactive oxygen species production and upregulated expression of proinflammatory factors, including tumour necrosis factor-alpha, regulated upon activation, normal T-cell expressed and secreted (RANTES), monocyte chemoattractant protein-1 and CXC chemokine ligand-1 by rat mesangial cells dose in a dependent fashion. Incubation with oxidized HDL also increased rat mesangial cells apoptosis in a dose-dependent manner. These effects partly depended on scavenger receptors CD36 and low-density lipoprotein receptor-1, but not scavenger receptor BI. In addition, co-culture with oxidized HDL activated P38/MAPK, extracellular-regulated kinase (ERK)/MAPK and nuclear factor-kappaB (NF-kappaB). CONCLUSIONS The results of the present study suggest that oxidized HDL enhanced proinflammatory properties in mesangial cells partly via CD36 and low-density lipoprotein receptor-1. MAPK and nuclear factor-kappaB pathways were involved in the process. The ability of oxidized HDL to negatively influence mesangial cell biology may represent an important mechanism of chronic kidney disease.
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Affiliation(s)
- Miao Zhang
- Department of Medicine, Drum Tower Hospital, Nanjing University Medical School, People's Republic of China
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24
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Starlinger P, Moll HP, Assinger A, Nemeth C, Hoetzenecker K, Gruenberger B, Gruenberger T, Kuehrer I, Schoppmann SF, Gnant M, Brostjan C. Thrombospondin-1: a unique marker to identify in vitro platelet activation when monitoring in vivo processes. J Thromb Haemost 2010; 8:1809-19. [PMID: 20492458 DOI: 10.1111/j.1538-7836.2010.03908.x] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
BACKGROUND Measuring platelet activation in patients has become a potent method to investigate pathophysiological processes. However, the commonly applied markers are sensitive to detrimental influences by in vitro platelet activation during blood analysis. OBJECTIVES Protein isoforms of platelet-derived thrombospondin-1 (TSP-1) were investigated for their potential to identify in vitro platelet activation when monitoring in vivo processes. METHODS TSP-1 was determined in plasma, serum or supernatant of purified platelets by ELISA and immunoblotting and was compared with standard markers of platelet activation. A collective of 20 healthy individuals and 30 cancer patients was analyzed. RESULTS While in vitro platelet degranulation led to a selective increase in the 200-kDa full-length molecule, an in vivo process involving platelet activation such as wound healing resulted in the predominant rise of the 140-kDa TSP-1 protein. The physiological ratio of circulating TSP-1 variants was determined and a cut-off level at 1.0 was defined to identify plasma samples with artificial in vitro platelet activation exceeding the cut-off level. In contrast, cancer patients known to frequently exhibit increased in vivo activation of platelets presented with a significantly decreased ratio of TSP-1 variants as compared with healthy volunteers. CONCLUSIONS In comparison to standard platelet markers, TSP-1 constitutes a sensitive and stable parameter suited to monitor in vitro platelet activation. The analysis of TSP-1 protein isoforms further offers a valuable tool to reliably discriminate between in vitro and in vivo effects, to exclude variability introduced during blood processing and improve clinical monitoring.
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Affiliation(s)
- P Starlinger
- Department of Surgery, General Hospital Institute of Physiology, Medical University of Vienna, Vienna, Austria
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25
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Assinger A, Koller F, Schmid W, Zellner M, Babeluk R, Koller E, Volf I. Specific binding of hypochlorite-oxidized HDL to platelet CD36 triggers proinflammatory and procoagulant effects. Atherosclerosis 2010; 212:153-60. [PMID: 20684828 DOI: 10.1016/j.atherosclerosis.2010.05.010] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/17/2009] [Revised: 05/06/2010] [Accepted: 05/06/2010] [Indexed: 01/13/2023]
Abstract
OBJECTIVE Oxidative stress and systemic inflammation negatively affect several protective functions of high density lipoproteins (HDL) and oxidative modification of HDL by the inflammation-derived oxidant hypochlorite converts HDL into a potent platelet agonist. Therefore it was the aim of this work to clarify if these platelet-activating effects result from specific binding of hypochlorite-oxidized HDL (hyp-OxHDL) to the platelet surface and to identify responsible receptors. METHODS Binding and functional studies were performed with hyp-OxHDL in absence and presence of (potential) competitors in normal and CD36-deficient human platelets. Platelet aggregation was quantified by light transmission aggregometry. Surface expression of CD62P, phosphatidylserine and CD40L was quantified by flow cytometry. RESULTS Binding studies reveal that hyp-OxHDL show specific and saturable high-affinity binding to the platelet surface. Hyp-OxHDL trigger platelet aggregation and in a dose dependent way provoke the release of significant amounts of CD40L as well as phosphatidylserine on the platelet surface. Blocking specific binding of hyp-OxHDL to the platelet surface interferes with the ability of hyp-OxHDL to stimulate human platelets. CD36-deficient human platelets show markedly reduced binding of hyp-OxHDL. Upon addition of hypochlorite-oxidized HDL, CD36-deficient platelets do not aggregate and completely fail to release CD40L or phosphatidylserine. CONCLUSIONS From these results we conclude that specific binding of hyp-OxHDL to platelet CD36 is essential for the proinflammatory and procoagulant effects of hyp-OxHDL shown within this work. The contribution of other receptors besides CD36 to specific binding of hyp-OxHDL to the platelet membrane appears to be minimal, at best.
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Affiliation(s)
- Alice Assinger
- Institute of Physiology, Center for Physiology & Pharmacology, Medical University of Vienna, Schwarzspanierstr. 17, A-1090 Vienna, Austria
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26
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Nofer JR, Brodde MF, Kehrel BE. High-density lipoproteins, platelets and the pathogenesis of atherosclerosis. Clin Exp Pharmacol Physiol 2010; 37:726-35. [PMID: 20337657 DOI: 10.1111/j.1440-1681.2010.05377.x] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
1. Prospective and interventional studies demonstrate an inverse relationship between plasma high-density lipoprotein (HDL)-cholesterol and the incidence of coronary artery disease. Although the atheroprotective effects of HDL are usually attributed to the reverse cholesterol transport, in which HDL shuttles cholesterol from cells in the arterial wall to the liver, other mechanisms are also under investigation. 2. Platelets are involved in both the initiation and progression of atherosclerotic lesions. In addition, the formation of thrombi over ruptured atherosclerotic plaques results in the narrowing or complete occlusion of coronary arteries. Current experimental evidence suggests that HDL may exert antiplatelet effects and thereby counteract the development of atherothrombotic vascular disease. 3. In vitro studies show that HDL inhibits agonist-stimulated platelet aggregation, fibrinogen binding, granule secretion and liberation of thromboxane A(2). Inhibitory effects of HDL are mediated, in part, by scavenger receptor type B1 and/or the apolipoprotein E receptor apoER2/LRP8 and are linked to the induction of intracellular signalling cascades encompassing stimulation of protein kinase C, cytoplasmatic alkalization and generation of nitric oxide. 4. Populational studies demonstrate that there is an inverse association between plasma HDL levels and recurrent venous thromboembolism. In addition, HDL-cholesterol has been identified as an independent predictor of acute platelet thrombus formation. The administration of reconstituted HDL particles in humans attenuates ex vivo platelet activation. 5. The present review summarizes recent advances in understanding HDL-platelet interactions and discusses the potential use of HDL-like particles in the therapy of thrombosis.
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Affiliation(s)
- Jerzy-Roch Nofer
- Center for Laboratory Medicine, University Hospital Münster, Münster, Germany.
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27
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Cox D, McConkey S. The role of platelets in the pathogenesis of cerebral malaria. Cell Mol Life Sci 2010; 67:557-68. [PMID: 20091081 PMCID: PMC11115904 DOI: 10.1007/s00018-009-0211-3] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2009] [Accepted: 11/05/2009] [Indexed: 01/31/2023]
Abstract
Malaria is a major cause of morbidity and mortality in the developing world and cerebral malaria is responsible for the majority of malaria-associated deaths. There is a strong association between thrombocytopenia and outcome in malaria, suggesting a role for platelets in the pathogenesis of malaria. This thrombocytopenia is likely due to platelet activation possibly through an interaction between PfEMP1 on plasmodium and CD36 on platelets. Platelet activation by plasmodium has two potential consequences. It can lead to the formation of micro-aggregates of infected red blood cells and platelets which can occlude blood vessels and it also leads to binding to and activation of the endothelium.
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Affiliation(s)
- Dermot Cox
- Molecular and Cellular Therapeutics, Royal College of Surgeons in Ireland, 123 St Stephens Green, Dublin 2, Ireland.
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28
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Silverstein RL. Type 2 scavenger receptor CD36 in platelet activation: the role of hyperlipemia and oxidative stress. CLINICAL LIPIDOLOGY 2009; 4:767. [PMID: 20161667 PMCID: PMC2819200 DOI: 10.2217/clp.09.57] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Platelet hyper-reactivity and a systemic prothrombotic state are associated with atherosclerosis and other inflammatory conditions. CD36, a member of the Type 2 scavenger receptor family, is a multiligand pattern recognition receptor that recognizes specific oxidized phospholipids, molecules expressed on microbial pathogens, apoptotic cells, and cell-derived microparticles. Recent studies have demonstrated that CD36 binding to oxidized LDL or microparticles activates a specific signaling pathway that induces platelet activation. This pathway is activated in vivo in the setting of hyperlipidemia and oxidant stress. Genetic deletion of CD36 protects mice from pathological thrombosis associated with hyperlipidemia without any apparent effect on normal hemostasis. Targeting CD36 or its signaling pathway could potentially lead to the development of novel antithrombotic therapies for patients with atheroinflammatory disorders.
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Affiliation(s)
- Roy L Silverstein
- Department of Cell Biology, Lerner Research Institute, Cleveland Clinic Foundation, Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, 9500 Euclid Ave 44195, NC10, Cleveland, OH, USA Tel.: +1 216 444 5220 Fax: +1 216 444 9404
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29
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van Wijk DF, Stroes ESG, Monajemi H. Changing paradigm in HDL metabolism and cellular effects. ACTA ACUST UNITED AC 2009. [DOI: 10.2217/17584299.4.1.17] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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