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Weiss R, Mostageer M, Eichhorn T, Huber S, Egger D, Spittler A, Tripisciano C, Kasper C, Weber V. The fluorochrome-to-protein ratio is crucial for the flow cytometric detection of tissue factor on extracellular vesicles. Sci Rep 2024; 14:6419. [PMID: 38494537 PMCID: PMC10944842 DOI: 10.1038/s41598-024-56841-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2023] [Accepted: 03/12/2024] [Indexed: 03/19/2024] Open
Abstract
Extracellular vesicles (EVs) have crucial roles in hemostasis and coagulation. They sustain coagulation by exposing phosphatidylserine and initiate clotting by surface expression of tissue factor (TF) under inflammatory conditions. As their relevance as biomarkers of coagulopathy is increasingly recognized, there is a need for the sensitive and reliable detection of TF+ EVs, but their flow cytometric analysis is challenging and has yielded controversial findings for TF expression on EVs in the vascular system. We investigated the effect of different fluorochrome-to-protein (F/P) ratios of anti-TF-fluorochrome conjugates on the flow cytometric detection of TF+ EVs from activated monocytes, mesenchymal stem cells (MSCs), and in COVID-19 plasma. Using a FITC-labeled anti-TF antibody (clone VD8), we show that the percentage of TF+ EVs declined with decreasing F/P ratios. TF was detected on 7.6%, 5.4%, and 1.1% of all EVs derived from activated monocytes at F/P ratios of 7.7:1, 6.6:1, and 5.2:1. A similar decline was observed for EVs from MSCs and for EVs in plasma, whereas the detection of TF on cells remained unaffected by different F/P ratios. We provide clear evidence that next to the antibody clone, the F/P ratio affects the flow cytometric detection of TF+ EVs and should be carefully controlled.
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Affiliation(s)
- René Weiss
- Center for Biomedical Technology, Department for Biomedical Research, University for Continuing Education Krems, Dr.-Karl-Dorrek-Strasse 30, 3500, Krems, Austria
| | - Marwa Mostageer
- Center for Biomedical Technology, Department for Biomedical Research, University for Continuing Education Krems, Dr.-Karl-Dorrek-Strasse 30, 3500, Krems, Austria
| | - Tanja Eichhorn
- Center for Biomedical Technology, Department for Biomedical Research, University for Continuing Education Krems, Dr.-Karl-Dorrek-Strasse 30, 3500, Krems, Austria
| | - Silke Huber
- Institute of Hygiene and Medical Microbiology, Medical University of Innsbruck, Innsbruck, Austria
| | - Dominik Egger
- Institute of Cell and Tissue Culture Technology, Department of Biotechnology, University of Natural Resources and Life Sciences, Vienna, Austria
| | - Andreas Spittler
- Core Facility Flow Cytometry & Surgical Research Laboratories, Medical University of Vienna, Vienna, Austria
| | - Carla Tripisciano
- Clinical Division of Haematology and Haemostaseology, Department of Medicine I, Medical University of Vienna, Vienna, Austria
| | - Cornelia Kasper
- Institute of Cell and Tissue Culture Technology, Department of Biotechnology, University of Natural Resources and Life Sciences, Vienna, Austria
| | - Viktoria Weber
- Center for Biomedical Technology, Department for Biomedical Research, University for Continuing Education Krems, Dr.-Karl-Dorrek-Strasse 30, 3500, Krems, Austria.
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Mackman N. Tissue Factor and COVID-19 Associated Thrombosis. Arterioscler Thromb Vasc Biol 2024; 44:523-529. [PMID: 38381854 PMCID: PMC10883617 DOI: 10.1161/atvbaha.123.320144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Accepted: 01/17/2024] [Indexed: 02/23/2024]
Abstract
Microbial infections activate the innate and adaptive immune systems.1 Pathogen-associated molecular patterns produced by microbes, such as double-stranded RNA, are detected by PRRs (pattern-recognition receptors), such as toll-like receptor 3, and this leads to the expression of interferons and cytokines.1,2.
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Affiliation(s)
- Nigel Mackman
- Department of Medicine, UNC Blood Research Center, University of North Carolina at Chapel Hill
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3
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Sachetto ATA, Mackman N. Monocyte Tissue Factor Expression: Lipopolysaccharide Induction and Roles in Pathological Activation of Coagulation. Thromb Haemost 2023; 123:1017-1033. [PMID: 37168007 PMCID: PMC10615589 DOI: 10.1055/a-2091-7006] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2021] [Accepted: 05/08/2023] [Indexed: 05/13/2023]
Abstract
The coagulation system is a part of the mammalian host defense system. Pathogens and pathogen components, such as bacterial lipopolysaccharide (LPS), induce tissue factor (TF) expression in circulating monocytes that then activates the coagulation protease cascade. Formation of a clot limits dissemination of pathogens, enhances the recruitment of immune cells, and facilitates killing of pathogens. However, excessive activation of coagulation can lead to thrombosis. Here, we review studies on the mechanism of LPS induction of TF expression in monocytes and its contribution to thrombosis and disseminated intravascular coagulation. Binding of LPS to Toll-like receptor 4 on monocytes induces a transient expression of TF that involves activation of intracellular signaling pathways and binding of various transcription factors, such as c-rel/p65 and c-Fos/c-Jun, to the TF promoter. Inhibition of TF in endotoxemia and sepsis models reduces activation of coagulation and improves survival. Studies with endotoxemic mice showed that hematopoietic cells and myeloid cells play major roles in the activation of coagulation. Monocyte TF expression is also increased after surgery. Activated monocytes release TF-positive extracellular vesicles (EVs) and levels of circulating TF-positive EVs are increased in endotoxemic mice and in patients with sepsis. More recently, it was shown that inflammasomes contribute to the induction of TF expression and activation of coagulation in endotoxemic mice. Taken together, these studies indicate that monocyte TF plays a major role in activation of coagulation. Selective inhibition of monocyte TF expression may reduce pathologic activation of coagulation in sepsis and other diseases without affecting hemostasis.
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Affiliation(s)
- Ana T. A. Sachetto
- Division of Hematology, Department of Medicine, UNC Blood Research Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States
| | - Nigel Mackman
- Division of Hematology, Department of Medicine, UNC Blood Research Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States
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4
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Wright A, Snyder OL, He H, Christenson LK, Fleming S, Weiss ML. Procoagulant Activity of Umbilical Cord-Derived Mesenchymal Stromal Cells' Extracellular Vesicles (MSC-EVs). Int J Mol Sci 2023; 24:ijms24119216. [PMID: 37298168 DOI: 10.3390/ijms24119216] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2023] [Revised: 05/11/2023] [Accepted: 05/17/2023] [Indexed: 06/12/2023] Open
Abstract
Many cell types, including cancer cells, release tissue factor (TF)-exposing extracellular vesicles (EVs). It is unknown whether MSC-EVs pose a thromboembolism risk due to TF expression. Knowing that MSCs express TF and are procoagulant, we hypothesize that MSC-EVs also might. Here, we examined the expression of TF and the procoagulant activity of MSC-EVs and the impact of EV isolation methods and cell culture expansion on EV yield, characterization, and potential risk using a design of experiments methodology. MSC-EVs were found to express TF and have procoagulant activity. Thus, when MSC-derived EVs are employed as a therapeutic agent, one might consider TF, procoagulant activity, and thromboembolism risk and take steps to prevent them.
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Affiliation(s)
- Adrienne Wright
- Department of Anatomy and Physiology, Kansas State University, Manhattan, KS 66506, USA
- Midwest Institute of Comparative Stem Cell Biotechnology, Kansas State University, Manhattan, KS 66506, USA
| | - Orman Larry Snyder
- Department of Anatomy and Physiology, Kansas State University, Manhattan, KS 66506, USA
- Midwest Institute of Comparative Stem Cell Biotechnology, Kansas State University, Manhattan, KS 66506, USA
| | - Hong He
- Department of Anatomy and Physiology, Kansas State University, Manhattan, KS 66506, USA
- Midwest Institute of Comparative Stem Cell Biotechnology, Kansas State University, Manhattan, KS 66506, USA
| | - Lane K Christenson
- Department of Cell Biology and Physiology, University of Kansas Medical Center, Kansas City, KS 66160, USA
| | - Sherry Fleming
- Division of Biology, Kansas State University, Manhattan, KS 66506, USA
| | - Mark L Weiss
- Department of Anatomy and Physiology, Kansas State University, Manhattan, KS 66506, USA
- Midwest Institute of Comparative Stem Cell Biotechnology, Kansas State University, Manhattan, KS 66506, USA
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5
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Mackman N, Sachetto ATA, Hisada Y. Measurement of tissue factor-positive extracellular vesicles in plasma: strengths and weaknesses of current methods. Curr Opin Hematol 2022; 29:266-274. [PMID: 35852819 DOI: 10.1097/moh.0000000000000730] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
PURPOSE OF REVIEW This review evaluates the different methods used to measure levels of tissue factor (TF) in plasma and on extracellular vesicles (EVs). Levels of TF-positive (TF+) EVs in blood are increased in a variety of diseases, such as cancer, sepsis, and viral infection, and are associated with thrombosis. Highly sensitive assays are required to measure the low levels of TF+ EVs in blood. RECENT FINDINGS TF antigen levels in plasma have been measured using standard ELISAs, SimpleStep ELISA technology, and solid-phase proximity ligation assay. Some studies reported the detection of TF+ EVs in plasma by flow cytometry. In addition, TF+ EVs can be captured onto beads and chips using anti-TF antibodies. Several assays have been developed to measure TF activity in EVs isolated from plasma. Importantly, activity-based assays are more sensitive than antigen-based assays as a single TF/FVIIa complex can generate large amounts of FXa. SUMMARY We recommend isolating EVs from plasma and measuring TF activity using a functional assay in the presence and absence of an anti-TF antibody. We do not recommend using antigen-based assays as these are not sensitive enough to detect the low levels of TF in plasma.
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Affiliation(s)
- Nigel Mackman
- UNC Blood Research Center, Division of Hematology, Department of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, USA
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Rivera Rivas JJ, Czuprynski CJ. Histophilus somni stimulates bovine monocyte-derived macrophages to release microparticles that increase fibrin clot formation in vitro. Vet Microbiol 2021; 264:109280. [PMID: 34808430 DOI: 10.1016/j.vetmic.2021.109280] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2021] [Revised: 10/14/2021] [Accepted: 11/08/2021] [Indexed: 11/28/2022]
Abstract
Histophilus somni is a Gram-negative coccobacillus that causes diffuse vasculitis and intravascular thrombosis that can lead to multiple organ failure in cattle. Macrophages are important cellular mediators of fibrin deposition and removal at sites of inflammation. It has become evident that macrophages and other cells release microparticles (MPs) that have an array of biological activities, including pro-coagulant activity. We sought to determine whether monocyte-derived macrophages exposed to H. somni in vitro release MPs that activate the clotting cascade in a manner that could lead to thrombus formation. Bovine monocyte-derived macrophages were incubated with H. somni (at a 10:1 ratio) in RPMI with 10% heat inactivated fetal bovine serum for 6 h at 37 °C with 5 % CO2. Membrane-shed MPs were isolated from the conditioned media, washed twice with Ca2+ and Mg2+ free HBSS, and pro-coagulant activity assessed by a one-step plasma clotting assay. We observed greater pro-coagulant activity for MPs from H. somni stimulated macrophages than from unstimulated controls. Microparticle pro-coagulant activity was inhibited by addition of an anti-tissue factor antibody. We also observed co-localization of fluorescein-labeled H. somni cells and annexin V staining as evaluated by confocal microscopy. These results demonstrate that exposure to H. somni cells causes bovine monocyte-derived macrophages to release MPs that contain tissue factor, the first such report for bovine macrophages. We infer that if similar events occur in vivo they could amplify thrombus formation in bovine histophilosis.
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Affiliation(s)
- José J Rivera Rivas
- Department of Pathobiological Sciences, School of Veterinary Medicine, University of Wisconsin-Madison, 2015 Linden Drive, Madison, WI, 53706, USA.
| | - Charles J Czuprynski
- Department of Pathobiological Sciences, School of Veterinary Medicine, University of Wisconsin-Madison, 2015 Linden Drive, Madison, WI, 53706, USA
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7
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Bacitracin and Rutin Regulate Tissue Factor Production in Inflammatory Monocytes and Acute Myeloid Leukemia Blasts. Cancers (Basel) 2021; 13:cancers13163941. [PMID: 34439096 PMCID: PMC8393688 DOI: 10.3390/cancers13163941] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 08/02/2021] [Accepted: 08/02/2021] [Indexed: 12/20/2022] Open
Abstract
Simple Summary Aberrant tissue factor (TF) expression by transformed myeloblasts and inflammatory monocytes contributes to coagulation activation in acute myeloid leukemia (AML). TF procoagulant activity (PCA) is regulated by protein disulfide isomerase (PDI), an oxidoreductase with chaperone activity, but its specific role in AML-associated TF biology is unclear. Here, we provide novel mechanistic insights into this interrelation. We show that bacitracin and rutin, two pan-inhibitors of the PDI family, prevent lipopolysaccharide (LPS)-induced monocyte TF production under inflammatory conditions and constitutive TF expression by THP1 cells and AML blasts, thus exerting promising anticoagulant activity. Downregulation of the TF protein was mainly restricted to its non-coagulant, cryptic pool and was at least partially regulated on the mRNA level in LPS-stimulated monocytes. Collectively, our study indicates a complex role of thiol isomerases in the regulation of myeloid TF PCA, with the most abundant PDI being a promising therapeutic target in the management of AML-associated coagulopathies. Abstract Aberrant expression of tissue factor (TF) by transformed myeloblasts and inflammatory monocytes drives coagulation activation in acute myeloid leukemia (AML). Although regulation of TF procoagulant activity (PCA) involves thiol-disulfide exchange reactions, the specific role of protein disulfide isomerase (PDI) and other thiol isomerases in AML-associated TF biology is unclear. THP1 cells and peripheral blood mononuclear cells (PBMCs) from healthy controls or AML patients were analyzed for thiol isomerase-dependent TF production under various experimental conditions. Total cellular and membrane TF antigen, TF PCA and TF mRNA were analyzed by ELISA, flow cytometry, clotting or Xa generation assay and qPCR, respectively. PBMCs and THP1 cells showed significant insulin reductase activity, which was inhibited by bacitracin or rutin. Co-incubation with these thiol isomerase inhibitors prevented LPS-induced TF production by CD14-positive monocytes and constitutive TF expression by THP1 cells and AML blasts. Downregulation of the TF antigen was mainly restricted to the cryptic pool of TF, efficiently preventing phosphatidylserine-dependent TF activation by daunorubicin, and at least partially regulated on the mRNA level in LPS-stimulated monocytes. Our study thus delineates a complex role of thiol isomerases in the regulation of myeloid TF PCA, with PDI being a promising therapeutic target in the management of AML-associated coagulopathies.
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Mackman N, Hisada Y, Grover SP, Rosell A, Havervall S, von Meijenfeldt F, Aguilera K, Lisman T, Thålin C. Response by Mackman et al to Letter Regarding Article, "Patients With COVID-19 Have Elevated Levels of Circulating Extracellular Vesicle Tissue Factor Activity That Is Associated With Severity and Mortality-Brief Report". Arterioscler Thromb Vasc Biol 2021; 41:e381-e382. [PMID: 34038165 DOI: 10.1161/atvbaha.121.316203] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Nigel Mackman
- UNC Blood Research Center, Division of Hematology, Department of Medicine, University of North Carolina, Chapel Hill (N.M., Y.H., S.P.G)
| | - Yohei Hisada
- UNC Blood Research Center, Division of Hematology, Department of Medicine, University of North Carolina, Chapel Hill (N.M., Y.H., S.P.G)
| | - Steven P Grover
- UNC Blood Research Center, Division of Hematology, Department of Medicine, University of North Carolina, Chapel Hill (N.M., Y.H., S.P.G)
| | - Axel Rosell
- Division of Internal Medicine, Department of Clinical Sciences, Karolinska Institutet, Danderyd Hospital, Stockholm, Sweden (A.R., S.H., K.A., C.T.)
| | - Sebastian Havervall
- Division of Internal Medicine, Department of Clinical Sciences, Karolinska Institutet, Danderyd Hospital, Stockholm, Sweden (A.R., S.H., K.A., C.T.)
| | - Fien von Meijenfeldt
- Surgical Research Laboratory, Department of Surgery, University of Groningen, University Medical Center Groningen, the Netherlands (F.v.M., T.L.)
| | - Katherina Aguilera
- Division of Internal Medicine, Department of Clinical Sciences, Karolinska Institutet, Danderyd Hospital, Stockholm, Sweden (A.R., S.H., K.A., C.T.)
| | - Ton Lisman
- Surgical Research Laboratory, Department of Surgery, University of Groningen, University Medical Center Groningen, the Netherlands (F.v.M., T.L.)
| | - Charlotte Thålin
- Division of Internal Medicine, Department of Clinical Sciences, Karolinska Institutet, Danderyd Hospital, Stockholm, Sweden (A.R., S.H., K.A., C.T.)
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Balbi C, Burrello J, Bolis S, Lazzarini E, Biemmi V, Pianezzi E, Burrello A, Caporali E, Grazioli LG, Martinetti G, Fusi-Schmidhauser T, Vassalli G, Melli G, Barile L. Circulating extracellular vesicles are endowed with enhanced procoagulant activity in SARS-CoV-2 infection. EBioMedicine 2021; 67:103369. [PMID: 33971404 PMCID: PMC8104913 DOI: 10.1016/j.ebiom.2021.103369] [Citation(s) in RCA: 58] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Revised: 03/26/2021] [Accepted: 04/14/2021] [Indexed: 12/29/2022] Open
Abstract
Background Coronavirus-2 (SARS-CoV-2) infection causes an acute respiratory syndrome accompanied by multi-organ damage that implicates a prothrombotic state leading to widespread microvascular clots. The causes of such coagulation abnormalities are unknown. The receptor tissue factor, also known as CD142, is often associated with cell-released extracellular vesicles (EV). In this study, we aimed to characterize surface antigens profile of circulating EV in COVID-19 patients and their potential implication as procoagulant agents. Methods We analyzed serum-derived EV from 67 participants who underwent nasopharyngeal swabs molecular test for suspected SARS-CoV-2 infection (34 positives and 33 negatives) and from 16 healthy controls (HC), as referral. A sub-analysis was performed on subjects who developed pneumonia (n = 28). Serum-derived EV were characterized for their surface antigen profile and tested for their procoagulant activity. A validation experiment was performed pre-treating EV with anti-CD142 antibody or with recombinant FVIIa. Serum TNF-α levels were measured by ELISA. Findings Profiling of EV antigens revealed a surface marker signature that defines circulating EV in COVID-19. A combination of seven surface molecules (CD49e, CD209, CD86, CD133/1, CD69, CD142, and CD20) clustered COVID (+) versus COVID (-) patients and HC. CD142 showed the highest discriminating performance at both multivariate models and ROC curve analysis. Noteworthy, we found that CD142 exposed onto surface of EV was biologically active. CD142 activity was higher in COVID (+) patients and correlated with TNF-α serum levels. Interpretation In SARS-CoV-2 infection the systemic inflammatory response results in cell-release of substantial amounts of procoagulant EV that may act as clotting initiation agents, contributing to disease severity. Funding Cardiocentro Ticino Institute, Ente ospedaliero Cantonale, Lugano-Switzerland.
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Affiliation(s)
- Carolina Balbi
- Laboratory of Cellular and Molecular Cardiology, Istituto Cardiocentro Ticino, Ente Ospedaliero Cantonale, Lugano, Switzerland; Center for Molecular Cardiology, Zurich, Switzerland
| | - Jacopo Burrello
- Laboratory for Cardiovascular Theranostics, Istituto Cardiocentro Ticino, Ente Ospedaliero Cantonale Lugano, Switzerland
| | - Sara Bolis
- Laboratory of Cellular and Molecular Cardiology, Istituto Cardiocentro Ticino, Ente Ospedaliero Cantonale, Lugano, Switzerland; Laboratory for Cardiovascular Theranostics, Istituto Cardiocentro Ticino, Ente Ospedaliero Cantonale Lugano, Switzerland
| | - Edoardo Lazzarini
- Laboratory for Cardiovascular Theranostics, Istituto Cardiocentro Ticino, Ente Ospedaliero Cantonale Lugano, Switzerland
| | - Vanessa Biemmi
- Laboratory for Cardiovascular Theranostics, Istituto Cardiocentro Ticino, Ente Ospedaliero Cantonale Lugano, Switzerland
| | - Enea Pianezzi
- Laboratory of Microbiology, Ente Ospedaliero Cantonale, Bellinzona, Switzerland
| | - Alessio Burrello
- Department of Electrical, Electronic and Information Engineering (DEI), University of Bologna, Bologna, Italy
| | - Elena Caporali
- Cardiology Department, Istituto Cardiocentro Ticino, Ente Ospedaliero Cantonale, Lugano, Switzerland
| | - Lorenzo Gauthier Grazioli
- Internal Medicine Department, Ospedale Regionale di Lugano, Ente Ospedaliero Cantonale, Lugano, Switzerland
| | - Gladys Martinetti
- Laboratory of Microbiology, Ente Ospedaliero Cantonale, Bellinzona, Switzerland
| | - Tanja Fusi-Schmidhauser
- Internal Medicine Department, Ospedale Regionale di Lugano, Ente Ospedaliero Cantonale, Lugano, Switzerland
| | - Giuseppe Vassalli
- Laboratory of Cellular and Molecular Cardiology, Istituto Cardiocentro Ticino, Ente Ospedaliero Cantonale, Lugano, Switzerland; Center for Molecular Cardiology, Zurich, Switzerland; Faculty of Biomedical Sciences, Università della Svizzera italiana, Lugano, Switzerland
| | - Giorgia Melli
- Faculty of Biomedical Sciences, Università della Svizzera italiana, Lugano, Switzerland; Laboratory for Biomedical Neurosciences, Neurocenter of Southern Switzerland, Lugano, Switzerland
| | - Lucio Barile
- Laboratory for Cardiovascular Theranostics, Istituto Cardiocentro Ticino, Ente Ospedaliero Cantonale Lugano, Switzerland; Faculty of Biomedical Sciences, Università della Svizzera italiana, Lugano, Switzerland; Institute of Life Science, Scuola Superiore Sant'Anna, Pisa, Italy.
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Mechanisms and biomarkers of cancer-associated thrombosis. Transl Res 2020; 225:33-53. [PMID: 32645431 PMCID: PMC8020882 DOI: 10.1016/j.trsl.2020.06.012] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Revised: 06/24/2020] [Accepted: 06/30/2020] [Indexed: 02/07/2023]
Abstract
Cancer-associated thrombosis is a leading cause of non-cancer death in cancer patients and is comprised of both arterial and venous thromboembolism (VTE). There are multiple risk factors for developing VTE, including cancer type, stage, treatment, and other medical comorbidities, which suggests that the etiology of thrombosis is multifactorial. While cancer-associated thrombosis can be treated with anticoagulation, benefits of therapy must be balanced with the increased bleeding risks seen in patients with cancer. Although risk models exist for primary and recurrent VTE, additional predictors are needed to improve model performance and discrimination of high-risk patients. This review will outline the diverse mechanisms driving thrombosis in cancer patients, as well as provide an overview of biomarkers studied in thrombosis risk and important considerations when selecting candidate biomarkers.
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Holstein K, Matysiak A, Witt L, Sievers B, Beckmann L, Haddad M, Renné T, Voigtlaender M, Langer F. LPS-induced expression and release of monocyte tissue factor in patients with haemophilia. Ann Hematol 2020; 99:1531-1542. [PMID: 32430703 PMCID: PMC7316670 DOI: 10.1007/s00277-020-04075-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Accepted: 05/04/2020] [Indexed: 12/11/2022]
Abstract
In haemophilia, thrombin generation and fibrin deposition upon vascular injury critically depend on the tissue factor (TF)-driven coagulation pathway. TF expression by monocytes/macrophages and circulating microvesicles contributes to haemostasis, thrombosis and inflammation. Inflammation is a hallmark of blood-induced joint disease. The aim of this study is to correlate TF production by whole-blood monocytes with inflammatory markers and clinical parameters in patients with moderate-to-severe haemophilia A or B (n = 43) in comparison to healthy males (n = 23). Monocyte TF antigen and microvesicle-associated TF procoagulant activity (MV TF PCA) were measured immediately after blood draw (baseline) and following incubation of whole blood with buffer or lipopolysaccharide (LPS) using two-colour flow cytometry and chromogenic FXa generation assay, respectively. Patients with HIV or uncontrolled HBV/HCV infections were excluded. TF was hardly detectable and not different in baseline and buffer-treaded samples from both groups. Stimulation with LPS, however, induced monocyte TF production, with increased TF-specific mean fluorescence intensity (P = 0.08) and MV TF PCA (P < 0.05) in patients compared to controls. Patients also had elevated hs-CRP and IL-6 serum levels (P < 0.001), which correlated with LPS-induced TF parameters. Further exploratory analyses revealed that the presence of systemic (low-grade) inflammation and boosted LPS-induced monocyte TF production were mainly restricted to patients with clinically controlled HBV and/or HCV infection (n = 16), who were older and also had a significantly worse orthopaedic joint score than patients with no history of viral hepatitis (P < 0.01). Our study delineates a previously unrecognised link between systemic inflammation and inducible monocyte TF production in patients with haemophilia A or B.
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Affiliation(s)
- Katharina Holstein
- Department of Haematology and Oncology, University Cancer Centre Hamburg (UCCH), University Medical Centre Eppendorf, Hamburg, Germany
| | - Anna Matysiak
- Department of Haematology and Oncology, University Cancer Centre Hamburg (UCCH), University Medical Centre Eppendorf, Hamburg, Germany
| | - Leonora Witt
- Department of Haematology and Oncology, University Cancer Centre Hamburg (UCCH), University Medical Centre Eppendorf, Hamburg, Germany
| | - Bianca Sievers
- Department of Haematology and Oncology, University Cancer Centre Hamburg (UCCH), University Medical Centre Eppendorf, Hamburg, Germany
| | - Lennart Beckmann
- Department of Haematology and Oncology, University Cancer Centre Hamburg (UCCH), University Medical Centre Eppendorf, Hamburg, Germany
| | - Munif Haddad
- Institute of Clinical Chemistry and Laboratory Medicine, University Medical Centre Eppendorf, Hamburg, Germany
| | - Thomas Renné
- Institute of Clinical Chemistry and Laboratory Medicine, University Medical Centre Eppendorf, Hamburg, Germany
| | - Minna Voigtlaender
- Department of Haematology and Oncology, University Cancer Centre Hamburg (UCCH), University Medical Centre Eppendorf, Hamburg, Germany
| | - Florian Langer
- Department of Haematology and Oncology, University Cancer Centre Hamburg (UCCH), University Medical Centre Eppendorf, Hamburg, Germany.
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12
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Østerud B, Bouchard BA. Detection of tissue factor in platelets: why is it so troublesome? Platelets 2019; 30:957-961. [DOI: 10.1080/09537104.2019.1624708] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Bjarne Østerud
- K.G. Jebsen Thrombosis Research Center (TREC), Deparment of Medical Biology, UiT The Artic University of Norway, Tromsø, Norway
| | - Beth A. Bouchard
- Department of Biochemistry, Larner College of Medicine at the University of Vermont, Burlington, VT, USA
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13
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Madkhali Y, Featherby S, Collier ME, Maraveyas A, Greenman J, Ettelaie C. The Ratio of Factor VIIa:Tissue Factor Content within Microvesicles Determines the Differential Influence on Endothelial Cells. TH OPEN 2019; 3:e132-e145. [PMID: 31259295 PMCID: PMC6598090 DOI: 10.1055/s-0039-1688934] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2018] [Accepted: 04/10/2019] [Indexed: 02/07/2023] Open
Abstract
Tissue factor (TF)-positive microvesicles from various sources can promote cellular proliferation or alternatively induce apoptosis, but the determining factors are unknown. In this study the hypothesis that the ratio of fVIIa:TF within microvesicles determines this outcome was examined. Microvesicles were isolated from HepG2, BxPC-3, 786-O, MDA-MB-231, and MCF-7 cell lines and microvesicle-associated fVIIa and TF antigen and activity levels were measured. Human coronary artery endothelial cells (HCAECs) were incubated with these purified microvesicles, or with combinations of fVIIa-recombinant TF, and cell proliferation/apoptosis was measured. Additionally, by expressing mCherry-PAR2 on HCAEC surface, PAR2 activation was quantified. Finally, the activation of PAR2 on HCAEC or the activities of TF and fVIIa in microvesicles were blocked prior to addition of microvesicles to cells. The purified microvesicles exhibited a range of fVIIa:TF ratios with HepG2 and 786-O cells having the highest (54:1) and lowest (10:1) ratios, respectively. The reversal from proapoptotic to proliferative was estimated to occur at a fVIIa:TF molar ratio of 15:1, but HCAEC could not be rescued at higher TF concentrations. The purified microvesicles induced HCAEC proliferation or apoptosis according to this ruling. Blocking PAR2 activation on HCAEC, or inhibiting fVIIa or TF-procoagulant function on microvesicles prevented the influence on HCAEC. Finally, incubation of HCAEC with recombinant TF resulted in increased surface exposure of fVII. The induction of cell proliferation or apoptosis by TF-positive microvesicles is dependent on the ratio of fVIIa:TF and involves the activation of PAR2. At lower TF concentrations, fVIIa can counteract the proapoptotic stimulus and induce proliferation.
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Affiliation(s)
- Yahya Madkhali
- Department of Biomedical Sciences, University of Hull, Hull, United Kingdom.,Department of Medical Laboratories, College of Applied Medical Sciences, Majmaah University, KSA, Al Majmaah, Saudi Arabia
| | - Sophie Featherby
- Department of Biomedical Sciences, University of Hull, Hull, United Kingdom
| | - Mary E Collier
- Department of Cardiovascular Sciences, University of Leicester, Glenfield General Hospital, Leicester, United Kingdom
| | - Anthony Maraveyas
- Division of Cancer-Hull York Medical School, University of Hull, Hull, United Kingdom
| | - John Greenman
- Department of Biomedical Sciences, University of Hull, Hull, United Kingdom
| | - Camille Ettelaie
- Department of Biomedical Sciences, University of Hull, Hull, United Kingdom
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14
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Elevated blood plasma levels of tissue factor-bearing extracellular vesicles in patients with atrial fibrillation. Thromb Res 2019; 173:141-150. [DOI: 10.1016/j.thromres.2018.11.026] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Revised: 11/05/2018] [Accepted: 11/27/2018] [Indexed: 02/06/2023]
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15
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Spectre G, Mobarrez F, Stålesen R, Östenson CG, Varon D, Wallen H, Hjemdahl P. Meal intake increases circulating procoagulant microparticles in patients with type 1 and type 2 diabetes mellitus. Platelets 2018; 30:348-355. [DOI: 10.1080/09537104.2018.1445837] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Galia Spectre
- Department of Medicine Solna, Clinical Pharmacology Unit, Karolinska Institutet and Karolinska University Hospital/Solna, Stockholm, Sweden
- Hematology Institute, Thrombosis and Heamostasis Unit, Rabin Medical Center, Beilinson Hospital, Petach Tikva, Israel
- The Sackler Faculty of Medicine, Tel-Aviv University, Tel Aviv, Israel
| | - Fariborz Mobarrez
- Department of Clinical Sciences, Danderyds Hospital, Division of Cardiovascular Medicine, Karolinska Institutet, Stockholm, Sweden
- Karolinska Institutet, Department of Medicine Solna, Unit of Rheumatology, Karolinska University Hospital, Stockholm, Sweden
| | - Ragnhild Stålesen
- Department of Medicine Solna, Clinical Pharmacology Unit, Karolinska Institutet and Karolinska University Hospital/Solna, Stockholm, Sweden
| | - Claes-Göran Östenson
- Department of Molecular Medicine and Surgery, Endocrinology and Diabetology Unit, Karolinska Institutet, Karolinska University Hospital/Solna, Stockholm,Sweden
| | - David Varon
- Department of Hematology, Coagulation Unit, Hadassah –Hebrew University Medical Center, Jerusalem, Israel
| | - Håkan Wallen
- Department of Clinical Sciences, Danderyds Hospital, Division of Cardiovascular Medicine, Karolinska Institutet, Stockholm, Sweden
| | - Paul Hjemdahl
- Department of Medicine Solna, Clinical Pharmacology Unit, Karolinska Institutet and Karolinska University Hospital/Solna, Stockholm, Sweden
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16
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Shantsila E, Montoro-García S, Gallego P, Lip GYH. Circulating microparticles: challenges and perspectives of flow cytometric assessment. Thromb Haemost 2017; 111:1009-14. [DOI: 10.1160/th13-11-0937] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2013] [Accepted: 01/07/2014] [Indexed: 12/18/2022]
Abstract
SummaryCirculating blood microparticles are likely to play a significant role as messengers of biological information. Their accurate quantification and characterisation is challenging and needs to be carefully designed with preferable usage of fresh minimally-processed blood samples. Utilisation of flow cytometers specifically designed for analysis of small-size particles is likely to provide considerable methodological advantages and should be the preferable option. This viewpoint manuscript provides a critical summary of the key methodological aspects of microparticle analysis.Note: The review process for this viewpoint article was fully handled by Christian Weber, Editor in Chief.
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17
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Wisgrill L, Lamm C, Hartmann J, Preißing F, Dragosits K, Bee A, Hell L, Thaler J, Ay C, Pabinger I, Berger A, Spittler A. Peripheral blood microvesicles secretion is influenced by storage time, temperature, and anticoagulants. Cytometry A 2017; 89:663-72. [PMID: 27442840 DOI: 10.1002/cyto.a.22892] [Citation(s) in RCA: 74] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2016] [Revised: 04/20/2016] [Accepted: 05/19/2016] [Indexed: 12/13/2022]
Abstract
Microvesicles (MVs) are small membrane bound vesicles released from various cell types after activation or apoptosis. In the last decades, MVs received an increased interest as biomarkers in inflammation, coagulation and cancer. However, standardized pre-analytical steps are crucial for the minimization of artifacts in the MV analysis. Thus, this study evaluated the MV release in whole blood samples under the influence of different anticoagulants, storage time and various temperature conditions. Samples were collected from healthy probands and processed immediately, after 4, 8, 24 and 48 hours at room temperature (RT) or 4°C. To identify MV subpopulations, platelet free plasma (PFP) was stained with Annexin V, calcein AM, CD15, CD41 and CD235a. Analysis was performend on a CytoFLEX flow cytometer. Procoagulatory function of MVs was measured using a phospholipid dependent activity and a tissue factor MVactivity assay. Without prior storage, sodium citrate showed the lowest MV count compared to heparin and EDTA. Interestingly, EDTA showed a significant release of myeloid-derived MVs (MMVs) compared to sodium citrate. Sodium citrate showed a stable MV count at RT in the first 8 hours after blood collection. Total MV counts increased after 24 hours in sodium citrated or heparinzed blood which was related to all subpopulations. Interestingly, EDTA showed stable platelet-derived MV (PMV) and erythrocyte-derived MV (EryMV) count at RT over a 48 h period. In addition, the procoagulatory potential increased significantly after 8-hour storage. Based on both, this work and literature data, the used anticoagulant, storage time and storage temperature differently influence the analysis of MVs within 8 hours. To date, sodium citrated tubes are recommended for MV enumeration and functional analysis. EDTA tubes might be an option for the clinical routine due to stable PMV and EryMV counts. These new approaches need to be validated in a clinical laboratory setting before being applied to patient studies. © 2016 International Society for Advancement of Cytometry.
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Affiliation(s)
- Lukas Wisgrill
- Department of Paediatrics and Adolescent Medicine, Division of Neonatology, Paediatric Intensive Care & Neuropaediatrics, Medical University of Vienna, Währinger Gürtel 18-20, Vienna, 1090, Austria
| | - Christian Lamm
- Department of Surgery, Research Labs, Medical University of Vienna, Lazarettgasse 14, Vienna, 1090, Austria
| | - Julia Hartmann
- Department of Surgery, Research Labs, Medical University of Vienna, Lazarettgasse 14, Vienna, 1090, Austria
| | - Falk Preißing
- Department of Surgery, Research Labs, Medical University of Vienna, Lazarettgasse 14, Vienna, 1090, Austria
| | - Klaus Dragosits
- Department of Surgery, Research Labs, Medical University of Vienna, Lazarettgasse 14, Vienna, 1090, Austria
| | - Annica Bee
- Department of Surgery, Research Labs, Medical University of Vienna, Lazarettgasse 14, Vienna, 1090, Austria
| | - Lena Hell
- Clinical Division of Haematology and Haemostaseology, Department of Medicine I, Medical University of Vienna, Vienna, Währinger Gürtel 18-20, Austria
| | - Johannes Thaler
- Clinical Division of Haematology and Haemostaseology, Department of Medicine I, Medical University of Vienna, Vienna, Währinger Gürtel 18-20, Austria
| | - Cihan Ay
- Clinical Division of Haematology and Haemostaseology, Department of Medicine I, Medical University of Vienna, Vienna, Währinger Gürtel 18-20, Austria
| | - Ingrid Pabinger
- Clinical Division of Haematology and Haemostaseology, Department of Medicine I, Medical University of Vienna, Vienna, Währinger Gürtel 18-20, Austria
| | - Angelika Berger
- Department of Paediatrics and Adolescent Medicine, Division of Neonatology, Paediatric Intensive Care & Neuropaediatrics, Medical University of Vienna, Währinger Gürtel 18-20, Vienna, 1090, Austria
| | - Andreas Spittler
- Department of Surgery, Research Labs, Medical University of Vienna, Lazarettgasse 14, Vienna, 1090, Austria
- Core Facility Flow Cytometry, Medical University of Vienna, Lazarettgasse 14, Vienna, 1090, Austria
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18
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Abstract
PURPOSE OF REVIEW The role of tissue factor (TF) in the initiation of the blood coagulation network leading to generation of a fibrin clot has been well defined over the past 50 years. Although much is known about this sequence of events and its regulation, many important questions remain unresolved. More recently, a complex role for TF in cellular processes independent of fibrin generation has emerged. This review summarizes some of the advances in this field. RECENT FINDINGS TF is the cellular receptor and cofactor for factor VII/VIIa; however, controversy still surrounds expression of TF within the vasculature, the role of circulating microvesicle pools of TF and mechanisms of 'encryption' of TF activity. However, there have been significant advances in the role of TF-initiated cell signalling. Lastly, an alternatively spliced TF transcript has been identified and some insights into its role in cancer cell metastasis/proliferation have been elucidated. SUMMARY Understanding of TF structure function has increased substantially; however, multiple controversies still surround some aspects of its regulation. TF has emerged as a pivotal player in orchestrating not only fibrin generation but wound repair. Derangement of these repair processes contributes significantly to the pathophysiology of a number of disease processes.
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19
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Tripisciano C, Weiss R, Eichhorn T, Spittler A, Heuser T, Fischer MB, Weber V. Different Potential of Extracellular Vesicles to Support Thrombin Generation: Contributions of Phosphatidylserine, Tissue Factor, and Cellular Origin. Sci Rep 2017; 7:6522. [PMID: 28747771 PMCID: PMC5529579 DOI: 10.1038/s41598-017-03262-2] [Citation(s) in RCA: 99] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2017] [Accepted: 04/25/2017] [Indexed: 01/05/2023] Open
Abstract
Cells release diverse types of vesicles constitutively or in response to proliferation, injury, inflammation, or stress. Extracellular vesicles (EVs) are crucial in intercellular communication, and there is emerging evidence for their roles in inflammation, cancer, and thrombosis. We investigated the thrombogenicity of platelet-derived EVs, which constitute the majority of circulating EVs in human blood, and assessed the contributions of phosphatidylserine and tissue factor exposure on thrombin generation. Addition of platelet EVs to vesicle-free human plasma induced thrombin generation in a dose-dependent manner, which was efficiently inhibited by annexin V, but not by anti-tissue factor antibodies, indicating that it was primarily due to the exposure of phosphatidylserine on platelet EVs. Platelet EVs exhibited higher thrombogenicity than EVs from unstimulated monocytic THP-1 cells, but blockade of contact activation significantly reduced thrombin generation by platelet EVs. Stimulation of monocytic cells with lipopolysaccharide enhanced their thrombogenicity both in the presence and in the absence of contact activation, and thrombin generation was efficiently blocked by anti-tissue factor antibodies. Our study provides evidence that irrespective of their cellular origin, EVs support the propagation of coagulation via the exposure of phosphatidylserine, while the expression of functional tissue factor on EVs appears to be limited to pathological conditions.
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Affiliation(s)
- Carla Tripisciano
- Christian Doppler Laboratory for Innovative Therapy Approaches in Sepsis, Danube University Krems, Dr.-Karl-Dorrek-Strasse 30, 3500, Krems, Austria
| | - René Weiss
- Christian Doppler Laboratory for Innovative Therapy Approaches in Sepsis, Danube University Krems, Dr.-Karl-Dorrek-Strasse 30, 3500, Krems, Austria
| | - Tanja Eichhorn
- Christian Doppler Laboratory for Innovative Therapy Approaches in Sepsis, Danube University Krems, Dr.-Karl-Dorrek-Strasse 30, 3500, Krems, Austria
| | - Andreas Spittler
- Core Facility Flow Cytometry & Surgical Research Laboratories, Medical University of Vienna, Lazarettgasse 14, 1090, Vienna, Austria
| | - Thomas Heuser
- Electron Microscopy Facility, Vienna Biocenter Core Facilities, Dr.-Bohr-Gasse 3, 1030, Vienna, Austria
| | - Michael Bernhard Fischer
- Christian Doppler Laboratory for Innovative Therapy Approaches in Sepsis, Danube University Krems, Dr.-Karl-Dorrek-Strasse 30, 3500, Krems, Austria.,Center for Biomedical Technology, Department for Health Sciences and Biomedicine, Danube University Krems, Dr.-Karl-Dorrek-Strasse 30, 3500, Krems, Austria
| | - Viktoria Weber
- Christian Doppler Laboratory for Innovative Therapy Approaches in Sepsis, Danube University Krems, Dr.-Karl-Dorrek-Strasse 30, 3500, Krems, Austria. .,Center for Biomedical Technology, Department for Health Sciences and Biomedicine, Danube University Krems, Dr.-Karl-Dorrek-Strasse 30, 3500, Krems, Austria.
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20
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Laroche M, Dunois C, Vissac AM, Amiral J. Update on functional and genetic laboratory assays for the detection of platelet microvesicles. Platelets 2017; 28:235-241. [PMID: 28102740 DOI: 10.1080/09537104.2016.1265925] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Functional and genetic assays for measuring platelet microvesicles (PMVs) are presented and discussed. Functional assays concern two groups of methods: a) homogeneous assays using the cofactor activity of phospholipids (PPLs) contained in PMVs and present in assayed plasmas, and a coagulation or a thrombin generation assay (TGA) as "end points"; b) capture-based assays, in which PMVs bind to an immobilized ligand, such as Annexin V in the presence of calcium, or monoclonal antibodies (MoAbs) specific for membrane proteins. Genetic assays aim to detect micro-RNA (miRNA) present in PMVs: miRNA must be extracted from plasma, and the expression pattern can be determined by various methods such as quantitative real-time PCR, microarray or sequencing. All these technical approaches introduce new exploration tools for measuring or quantitating PMVs or their associated activities, as biomarkers for disease evolution, their diagnosis or prognosis, and for monitoring of some antithrombotic or anti-inflammatory therapies. They offer invaluable analytical tools for research, drug discovery and epidemiological studies and have a strong potential as diagnostic tests.
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Affiliation(s)
- Maxime Laroche
- a R&D Department , HYPHEN BioMed , Neuville sur Oise , France
| | - Claire Dunois
- a R&D Department , HYPHEN BioMed , Neuville sur Oise , France
| | | | - Jean Amiral
- b Scientific Consultant for HYPHEN BioMed , Neuville sur Oise , France
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21
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Gabbasov ZA, Saburova OS, Antonova OA, Golubeva NV, Khaspekova SG, Shustova ON, Zyuryaev IT, Ruda MY, Mazurov AV. Platelet subpopulation bearing leukocyte specific antigen and tissue factor. DOKL BIOCHEM BIOPHYS 2017; 471:431-434. [PMID: 28058691 DOI: 10.1134/s1607672916060156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2016] [Indexed: 11/23/2022]
Abstract
Platelets bearing leukocyte antigen CD45 were identified in the blood of patients with myocardial infarction (MI) and healthy donors by flow cytofluorimetry. Part of these platelets contained tissue factor (TF)-primary initiator of blood clotting. The number of CD45+ and CD45+/TF+ platelets in MI patients at the first day was comparable with their level in healthy donors, but was increased at 8-12 days after MI onset. At that time in some patients the amount of CD45+ and CD45+/TF+ platelets reached 5-6 and 2-3% of their total number. It is assumed that CD45+/TF+ platelets could be formed as a result of platelet interaction with leukocytes or leukocyte produced membrane microparticles.
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Affiliation(s)
- Z A Gabbasov
- Russian Cardiology Research and production Complex, Russian Ministry of Health, Moscow, Russia
| | - O S Saburova
- Russian Cardiology Research and production Complex, Russian Ministry of Health, Moscow, Russia
| | - O A Antonova
- Russian Cardiology Research and production Complex, Russian Ministry of Health, Moscow, Russia
| | - N V Golubeva
- Russian Cardiology Research and production Complex, Russian Ministry of Health, Moscow, Russia
| | - S G Khaspekova
- Russian Cardiology Research and production Complex, Russian Ministry of Health, Moscow, Russia
| | - O N Shustova
- Russian Cardiology Research and production Complex, Russian Ministry of Health, Moscow, Russia
| | - I T Zyuryaev
- Russian Cardiology Research and production Complex, Russian Ministry of Health, Moscow, Russia
| | - M Ya Ruda
- Russian Cardiology Research and production Complex, Russian Ministry of Health, Moscow, Russia
| | - A V Mazurov
- Russian Cardiology Research and production Complex, Russian Ministry of Health, Moscow, Russia.
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22
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Matijevic N, Wang YWW, Holcomb JB, Kozar R, Cardenas JC, Wade CE. Microvesicle phenotypes are associated with transfusion requirements and mortality in subjects with severe injuries. J Extracell Vesicles 2015; 4:29338. [PMID: 26689982 PMCID: PMC4685295 DOI: 10.3402/jev.v4.29338] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2015] [Revised: 11/23/2015] [Accepted: 11/26/2015] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Severe injury often results in substantial bleeding and mortality. Injury provokes cellular activation and release of extracellular vesicles. Circulating microvesicles (MVs) are predominantly platelet-derived and highly procoagulant. They support hemostasis and vascular function. The roles of MVs in survival after severe injury are largely unknown. We hypothesized that altered MV phenotypes would be associated with transfusion requirements and poor outcomes. METHODS This single-centre study was approved by the Institutional Review Board. The study cohort consisted of patients with major trauma requiring blood product transfusion and 26 healthy controls. Plasma samples for MVs were collected upon admission to the emergency department (n=169) and post-resuscitation (n=42), and analysed by flow cytometry for MV counts and cellular origin: platelet (PMV), erythrocyte (RMV), leukocyte (LMV), endothelial (EMV), tissue factor (TFMV), and annexin V (AVMV). Twenty-four hour mortality is the outcome measurement used to classify survivors versus non-survivors. Data were compared over time and analysed with demographic and clinical data. RESULTS The median age was 34 (IQR 23, 51), 72% were male, Injury Severity Score was 29 (IQR 19, 36), and 24 h mortality was 13%. MV levels and phenotypes differed between patients and controls. Elevated admission EMVs were found both in survivors (409/µL) and non-survivors (393/µL) compared to controls (23/µL, p<0.001) and persisted over time. Admission levels of PMV, AVMV, RMV, and TFMV were significantly lower in patients who died compared to survivors, but were not independently associated with the 24 h mortality rate. Patients with low MV levels at admission received the most blood products within the first 24 h. AVMV and PMV levels either increased over time or stabilized in survivors but decreased in non-survivors, resulting in significantly lower levels at intensive care unit admission in non-survivors (1,048 vs. 1,880 AVMV/µL, p<0.00004 and 1,245 PMP/µL vs. 1,866 PMP/µL, p=0.003). CONCLUSION Severe injury results in endothelial activation and altered MV phenotypes. Significant differences in specific MV phenotypes or changes over time were associated with blood product requirements and the 24 h mortality rate.
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Affiliation(s)
- Nena Matijevic
- Department of Surgery, The University of Texas Health Science Center at Houston, Houston, TX, USA.,The Center for Translational Injury Research, The University of Texas Health Science Center at Houston, Houston, TX, USA;
| | - Yao-Wei W Wang
- The Center for Translational Injury Research, The University of Texas Health Science Center at Houston, Houston, TX, USA
| | - John B Holcomb
- Department of Surgery, The University of Texas Health Science Center at Houston, Houston, TX, USA.,The Center for Translational Injury Research, The University of Texas Health Science Center at Houston, Houston, TX, USA
| | - Rosemary Kozar
- Department of Surgery, The University of Texas Health Science Center at Houston, Houston, TX, USA
| | - Jessica C Cardenas
- Department of Surgery, The University of Texas Health Science Center at Houston, Houston, TX, USA.,The Center for Translational Injury Research, The University of Texas Health Science Center at Houston, Houston, TX, USA
| | - Charles E Wade
- Department of Surgery, The University of Texas Health Science Center at Houston, Houston, TX, USA.,The Center for Translational Injury Research, The University of Texas Health Science Center at Houston, Houston, TX, USA
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23
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Gardiner C, Harrison P, Belting M, Böing A, Campello E, Carter BS, Collier ME, Coumans F, Ettelaie C, van Es N, Hochberg FH, Mackman N, Rennert RC, Thaler J, Rak J, Nieuwland R. Extracellular vesicles, tissue factor, cancer and thrombosis - discussion themes of the ISEV 2014 Educational Day. J Extracell Vesicles 2015; 4:26901. [PMID: 25773446 PMCID: PMC4359985 DOI: 10.3402/jev.v4.26901] [Citation(s) in RCA: 68] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2014] [Revised: 02/11/2015] [Accepted: 02/18/2015] [Indexed: 12/31/2022] Open
Abstract
Although the association between cancer and venous thromboembolism (VTE) has long been known, the mechanisms are poorly understood. Circulating tissue factor–bearing extracellular vesicles have been proposed as a possible explanation for the increased risk of VTE observed in some types of cancer. The International Society for Extracellular Vesicles (ISEV) and International Society on Thrombosis and Haemostasis (ISTH) held a joint Educational Day in April 2014 to discuss the latest developments in this field. This review discusses the themes of that event and the ISEV 2014 meeting that followed.
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Affiliation(s)
- Chris Gardiner
- Nuffield Department of Obstetrics and Gynaecology, University of Oxford, Level 3 Women's Centre, John Radcliffe Hospital, Oxford, UK;
| | - Paul Harrison
- School of Immunity and Infection, University of Birmingham Medical School, Birmingham, UK
| | - Mattias Belting
- Department of Oncology and Pathology, Clinical Sciences, Skåne University Hospital, Lund, Sweden
| | - Anita Böing
- Department of Clinical Chemistry, Academic Medical Centre of the University of Amsterdam, Amsterdam, The Netherlands
| | - Elena Campello
- Department of Cardiologic, Thoracic and Vascular Sciences, University of Padua Medical School, Padua, Italy
| | - Bob S Carter
- Division of Neurosurgery, University of California San Diego, La Jolla, CA, USA
| | - Mary E Collier
- Department of Cardiovascular Sciences, University of Leicester, Clinical Sciences Wing, Glenfield General Hospital, Leicester, UK
| | - Frank Coumans
- Department of Clinical Chemistry, Academic Medical Centre of the University of Amsterdam, Amsterdam, The Netherlands.,Department of Biomedical Engineering and Physics, Academic Medical Centre of the University of Amsterdam, Amsterdam, The Netherlands
| | - Camille Ettelaie
- School of Biological, Biomedical and Environmental Sciences, The University of Hull, Hull, UK
| | - Nick van Es
- Department of Vascular Medicine, Academic Medical Centre of the University of Amsterdam, Amsterdam, The Netherlands
| | - Fred H Hochberg
- Division of Neurosurgery, University of California San Diego, La Jolla, CA, USA.,Department of Neurology and Program in Neuroscience, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | - Nigel Mackman
- Thrombosis and Hemostasis Program, Department of Medicine, UNC McAllister Heart Institute, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Robert C Rennert
- Division of Neurosurgery, University of California San Diego, La Jolla, CA, USA
| | - Johannes Thaler
- Clinical Division of Haematology and Haemostaseology, Department of Medicine I, Medical University of Vienna, Vienna, Austria
| | - Janusz Rak
- Department of Pediatrics, McGill University, Montreal Children's Hospital Research Institute MUHC, Montreal, QC, Canada
| | - Rienk Nieuwland
- Department of Clinical Chemistry, Academic Medical Centre of the University of Amsterdam, Amsterdam, The Netherlands
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24
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Dicke C, Langer F. Pathophysiology of Trousseau's syndrome. Hamostaseologie 2014; 35:52-9. [PMID: 25403091 DOI: 10.5482/hamo-14-08-0037] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2014] [Accepted: 11/06/2014] [Indexed: 12/26/2022] Open
Abstract
Clinically relevant clotting abnormalities in cancer patients are referred to as Trousseau's syndrome. While thrombotic complications such as venous thromboembolism are most frequent in every day's practice, cancer patients may also experience severe bleeding symptoms due to complex systemic coagulopathies, including disseminated intravascular coagulation, haemolytic thrombotic microangiopathy, and hyperfibrinolysis. The pathophysiology of Trousseau's syndrome involves all aspects of Virchow's triad, but previous basic research has mainly focused on the cellular and molecular mechanisms underlying blood hypercoagulability in solid cancers and haematological malignancies. In this regard, over-expression of tissue factor (TF), the principal initiator of the extrinsic coagulation pathway, by primary tumour cells and increased shedding of TF-bearing plasma microparticles are critical to both thrombus formation and cancer progression. However, novel findings on intrinsic contact activation in vivo, such as the release of polyphosphates or DNA by activated platelets and neutrophils, respectively, have pointed to additional pathways in the complex pathophysiology of Trousseau's syndrome.
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Affiliation(s)
| | - F Langer
- Priv.-Doz. Dr. med. Florian Langer, II. Medizinische Klinik und Poliklinik, Hubertus Wald Tumorzentrum - Universitäres Cancer Center Hamburg (UCCH), Universitätsklinikum Eppendorf, Martinistr. 52, 20246 Hamburg, Germany, Tel. +49/(0)40/741 05-24 53, -06 64; Fax -51 93, E-mail:
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25
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Cugno M, Marzano AV, Lorini M, Carbonelli V, Tedeschi A. Enhanced tissue factor expression by blood eosinophils from patients with hypereosinophilia: a possible link with thrombosis. PLoS One 2014; 9:e111862. [PMID: 25375118 PMCID: PMC4222944 DOI: 10.1371/journal.pone.0111862] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2014] [Accepted: 10/05/2014] [Indexed: 12/30/2022] Open
Abstract
Thrombotic risk is increased in eosinophil-mediated disorders, and several hypotheses have been proposed to link eosinophilia and thrombosis. In particular, eosinophils have been described as source of tissue factor (TF), the main initiator of blood coagulation; however, this aspect is still controversial. This study was aimed to evaluate whether TF expression varies in eosinophils isolated from normal subjects and patients with different hypereosinophilic conditions. Eosinophils were immunologically purified from peripheral blood samples of 9 patients with different hypereosinophilic conditions and 9 normal subjects. Western blot analysis and real-time polymerase chain reaction (RT-PCR) were performed to test eosinophil TF expression. For comparison, TF expression was evaluated in monocytes from blood donors and in human endothelial (ECV304) and fibroblast (IMR90) cell lines. Western blot analysis revealed a major band of 47,000 corresponding to native TF in homogenates of purified eosinophils with a higher intensity in the 9 patients than in the 9 controls (p<0.0001). According to RT-PCR cycle threshold (Ct), TF gene expression was higher in eosinophils from patients than in those from controls, median (range) 35.10 (19.45-36.50) vs 37.17 (35.33-37.87) (p = 0.002), and was particularly abundant in one patient with idiopathic hypereosinophilic syndrome and ischemic heart attacks (Ct: 19.45). TF gene expression was moderate in monocytes, Ct: 31.32 (29.82-33.49) and abundant in endothelial cells, Ct: 28.70 (27.79-29.57) and fibroblasts, Ct: 22.77 (19.22-25.05). Our results indicate that human blood eosinophils contain variable amounts of TF. The higher TF expression in patients with hypereosinophilic disorders may contribute to increase the thrombotic risk.
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Affiliation(s)
- Massimo Cugno
- Dipartimento di Fisiopatologia Medico-Chirurgica e dei Trapianti, Università degli Studi di Milano, Milano, Italy
- Medicina Interna, Fondazione IRCCS Ca' Granda, Ospedale Maggiore Policlinico, Milano, Italy
- * E-mail:
| | - Angelo V. Marzano
- Unità Operativa di Dermatologia, Fondazione IRCCS Ca' Granda, Ospedale Maggiore Policlinico, Milano, Italy
| | - Maurizio Lorini
- Dipartimento di Fisiopatologia Medico-Chirurgica e dei Trapianti, Università degli Studi di Milano, Milano, Italy
| | - Vincenzo Carbonelli
- Dipartimento di Fisiopatologia Medico-Chirurgica e dei Trapianti, Università degli Studi di Milano, Milano, Italy
| | - Alberto Tedeschi
- Unità Operativa di Allergologia e Immunologia Clinica, Fondazione IRCCS Ca' Granda, Ospedale Maggiore Policlinico, Milano, Italy
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Curry N, Raja A, Beavis J, Stanworth S, Harrison P. Levels of procoagulant microvesicles are elevated after traumatic injury and platelet microvesicles are negatively correlated with mortality. J Extracell Vesicles 2014; 3:25625. [PMID: 26077419 PMCID: PMC4216813 DOI: 10.3402/jev.v3.25625] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2014] [Revised: 10/03/2014] [Accepted: 10/08/2014] [Indexed: 12/16/2022] Open
Abstract
BACKGROUND Microvesicles (MV) have been implicated in the development of thrombotic disease, such as acute respiratory distress syndrome (ARDS) and multiple organ failure (MOF). Trauma patients are at increased risk of late thrombotic events, particularly those who receive a major transfusion. The aims of this study were: (a) to determine whether there were increased numbers of pro-coagulant MV following injury; (b) to determine their cellular origin; and (c) to explore the effects of MV with clinical outcomes; in particular red cell transfusion requirements and death. METHODS Trauma patients were recruited at a Level 1 trauma centre. The presence of MV procoagulant phospholipid (PPL) was assessed using 2 activity assays (PPL and thrombin generation). Enumeration and MV cellular origin was assessed using 2 colour flow cytometry. RESULTS Fifty consecutive patients were recruited; median age 38 (IQR: 24-55), median ISS 18 (IQR: 9-27). Circulating procoagulant MV, rich in phospholipid, were significantly elevated following traumatic injury relative to controls and remained elevated at 72 h post-injury. Red cell/AnnV+ and platelet/AnnV+ MV numbers were 6-fold and 2-fold higher than controls, respectively. Patients who died (n=9, 18%) had significantly fewer CD41/AnnV+ MV and lower endogenous thrombin potential relative to patients who survived. CONCLUSIONS MV are elevated following traumatic injury and may be implicated in the increased risk of trauma patients to pro-thrombotic states such as MOF and ARDS. Lower levels of procoagulant MV are associated with mortality and further investigation of this association is warranted.
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Affiliation(s)
- Nicola Curry
- Oxford Haemophilia & Thrombosis Centre, Oxford University Hospitals Trust, Churchill Hospital, Oxford, UK
| | - Amber Raja
- National Blood & Transplant, John Radcliffe Hospital, Oxford, UK
| | - James Beavis
- Oxford Haemophilia & Thrombosis Centre, Oxford University Hospitals Trust, Churchill Hospital, Oxford, UK
| | - Simon Stanworth
- National Blood & Transplant, John Radcliffe Hospital, Oxford, UK
| | - Paul Harrison
- School of Immunity and Infection, University of Birmingham Medical School, Birmingham, UK;
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Rautou PE, Mackman N. Microvesicles as risk markers for venous thrombosis. Expert Rev Hematol 2014; 6:91-101. [DOI: 10.1586/ehm.12.74] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Platelets do not express the oxidized or reduced forms of tissue factor. Biochim Biophys Acta Gen Subj 2013; 1840:1188-93. [PMID: 24361609 DOI: 10.1016/j.bbagen.2013.11.024] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2013] [Revised: 11/11/2013] [Accepted: 11/25/2013] [Indexed: 02/07/2023]
Abstract
BACKGROUND Expression of tissue factor (TF) antigen and activity in platelets is controversial and dependent upon the laboratory and reagents used. Two forms of TF were described: an oxidized functional form and a reduced nonfunctional form that is converted to the active form through the formation of an allosteric disulfide. This study tests the hypothesis that the discrepancies regarding platelet TF expression are due to differential expression of the two forms. METHODS Specific reagents that recognize both oxidized and reduced TF were used in flow cytometry of unactivated and activated platelets and western blotting of whole platelet lysates. TF-dependent activity measurements were used to confirm the results. RESULTS Western blotting analyses of placental TF demonstrated that, in contrast to anti-TF#5, which is directed against the oxidized form of TF, a sheep anti-human TF polyclonal antibody recognizes both the reduced and oxidized forms. Flow cytometric analyses demonstrated that the sheep antibody did not react with the surface of unactivated platelets or platelets activated with thrombin receptor agonist peptide, PAR-1. This observation was confirmed using biotinylated active site-blocked factor (F)VIIa: no binding was observed. Likewise, neither form of TF was detected by western blotting of whole platelet lysates with sheep anti-hTF. Consistent with these observations, no FXa or FIXa generation by FVIIa was detected at the surface of these platelets. Similarly, no TF-related activity was observed in whole blood using thromboelastography. CONCLUSION AND SIGNIFICANCE Platelets from healthy donors do not express either oxidized (functional) or reduced (nonfunctional) forms of TF.
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Geddings JE, Mackman N. Comment on "tissue factor expressed by microparticles is associated with mortality but not with thrombosis in cancer patients". Thromb Haemost 2013; 111:180-1. [PMID: 24153434 DOI: 10.1160/th13-07-0599] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2013] [Accepted: 09/04/2013] [Indexed: 11/05/2022]
Affiliation(s)
| | - Nigel Mackman
- Nigel Mackman, PhD, 98 Manning Drive, CB# 7035, University of North Carolina, Chapel Hill, North Carolina 27599, USA, Tel.: +1 919 843 3961, Fax: +1 919 966 7639, E-mail:
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Geddings JE, Mackman N. Tumor-derived tissue factor-positive microparticles and venous thrombosis in cancer patients. Blood 2013; 122:1873-80. [PMID: 23798713 PMCID: PMC3772497 DOI: 10.1182/blood-2013-04-460139] [Citation(s) in RCA: 241] [Impact Index Per Article: 21.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2013] [Accepted: 06/04/2013] [Indexed: 12/14/2022] Open
Abstract
Patients with cancer have an increased risk for venous thrombosis. Interestingly, different cancer types have different rates of thrombosis, with pancreatic cancer having one of the highest rates. However, the mechanisms responsible for the increase in venous thrombosis in patients with cancer are not understood. Tissue factor (TF) is a transmembrane receptor and primary initiator of blood coagulation. Tumor cells express TF and spontaneously release TF-positive microparticles (MPs) into the blood. MPs are small membrane vesicles that are highly procoagulant. It has been proposed that these circulating tumor-derived, TF-positive MPs may explain the increased rates of venous thrombosis seen in patients with cancer. In animal models, increased levels of tumor-derived, TF-positive MPs are associated with activation of coagulation. Moreover, these MPs bind to sites of vascular injury and enhance thrombosis. We and others have found that patients with cancer have elevated levels of circulating TF-positive MPs. These MPs are derived from tumors because they express tumor markers and are decreased by tumor resection. Importantly, several studies have shown that increased levels of TF-positive MPs correlate with venous thrombosis in patients with cancer. Taken together, these results suggest that TF-positive MPs may be a useful biomarker to identify patients with cancer who are at high risk for thrombosis.
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Abstract
Tissue factor (TF) is a transmembrane cofactor that binds and promotes the catalytic activity of factor (F) VIIa. The TF/VIIa complex activates FX by limited proteolysis to initiate blood coagulation and helps provide the thrombin burst that is important for a stable thrombus. TF is present both in the extravascular compartment, where it functions as a hemostatic envelope, and the intravascular compartment, where it contributes to thrombus formation, particularly when endothelial disruption is minimal. The regulation of its cofactor function appears to differ in the two compartments. Intravascular TF derives predominately from leucocytes, with either monocytes or neutrophils implicated in different models of thrombosis. This TF exists mostly in a non-coagulant or cryptic form and acute events lead to local decryption of TF and FX activation. A variety of experimental observations imply that decryption of leucocyte surface TF involves both a dithiol/disulfide switch and exposure of phosphatidylserine. The dithiol/disulfide switch appears to involve the Cys186-Cys209 disulfide bond in the membrane-proximal domain of TF, although this has not been demonstrated in vivo. Activation of a purinergic receptor or complement has recently been observed to decrypt TF on myeloid cells and a dithiol/disulfide switch and the oxidoreductase, protein disulfide isomerase, have been implicated in both systems. The molecular mechanism of action of protein disulfide isomerase in TF encryption/decryption, though, remains to be determined.
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Affiliation(s)
- V M Chen
- Lowy Cancer Research Centre and Prince of Wales Clinical School, University of New South Wales, Sydney, NSW, Australia
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Mackman N, Luther T. Platelet tissue factor: to be or not to be. Thromb Res 2013; 132:3-5. [PMID: 23731564 DOI: 10.1016/j.thromres.2013.05.009] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2013] [Revised: 05/05/2013] [Accepted: 05/07/2013] [Indexed: 10/26/2022]
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Human platelets do not express tissue factor. Thromb Res 2013; 132:112-5. [PMID: 23623171 DOI: 10.1016/j.thromres.2013.04.010] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2013] [Revised: 04/09/2013] [Accepted: 04/09/2013] [Indexed: 11/22/2022]
Abstract
BACKGROUND The controversy about the expression of tissue factor (TF) in platelet after de novo synthesis prevail despite many groups recognize that platelet isolation, assays and reagents, particularly non-specific antibodies, may account for the diversity. In this study the potential of TF expression was evaluated using immune-purified human platelets and employing a very sensitive and highly specific TF activity assay. METHODS Isolated platelets in plasma anti-coagulated with Fragmin were subjected to stimulation by LPS plus PMA, IgG antibody or TRAP and tested for TF activity. RESULTS Platelets stimulated with LPS plus PMA for 4 hours expressed trace amounts of TF like activity (PCA), not inhibited by anti-TF antibody (0.2±0.1 mU/ml blood). Platelets, not immune-adsorbed to remove monocytes, showed significant TF activity (2.0±0.9 mU/ml blood) that was nearly abolished by anti-TF antibody. IgG antibody from patient with lupus anticoagulant failed to enhance the trace amount of PCA as compared to the control in contrast to high TF activity induced in monocytes (0.4±0.1 mU/ml blood versus 27.5±10.5 mU/10(6) cells) showing that activation of complement is not mediating TF expression. Platelet subjected to TRAP activation for 10 min possessed only trace amounts of PCA that was not inhibited by anti-TF antibody and slightly enhanced by anti-TFPI antibody. CONCLUSIONS It is concluded that platelets free of monocytes do not express TF activity when stimulated by LPS or activated complement factors, implying no role for Toll like receptor (TLR4) as suggested recently. There is no evidence of TF activity associated with platelets as a result of rapid and dynamic process.
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Gao C, Xie R, Li W, Zhou J, Liu S, Cao F, Liu Y, Ma R, Si Y, Liu Y, Bi Y, Gilbert GE, Shi J. Endothelial cell phagocytosis of senescent neutrophils decreases procoagulant activity. Thromb Haemost 2013; 109:1079-90. [PMID: 23571768 DOI: 10.1160/th12-12-0894] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2012] [Accepted: 03/14/2013] [Indexed: 12/22/2022]
Abstract
Abundant senescent neutrophils traverse the vascular compartment and may contribute to pathologic conditions. For example, they become procoagulant when undergoing apoptosis and may contribute to thrombosis or inflammation. Our previous studies demonstrated a dominant clearance pathway in which the neutrophils can be phagocytosed by liver macrophages. The aim of this study was to explore an alternate pathway of neutrophil clearance by endothelial cells. Phagocytosis of the neutrophils by endothelial cells was performed using various experimental approaches includingflow cytometry, confocal microscopy and electron microscopy assays in vitro and in vivo. Procoagulant activity of cultured neutrophils was evaluated by coagulation time, factor Xase and prothrombinase assays. Lactadherin functioned as a novel probe for the detection of phosphatidylserine on apoptotic cells, an opsonin (bridge) between apoptotic cell and phagocyte for promoting phagocytosis, and an efficient anticoagulant for inhibition of factor Xase and thrombin formation. When cultured, purified human neutrophils spontaneously entered apoptosis and developed procoagulant activity that was directly related to the degree of phosphatidylserine exposure. Co-culture of aged neutrophils and endothelial cells resulted in phagocytosis of the neutrophils and prolonged coagulation time. Lactadherin diminished the procoagulant activity and increased the rate of neutrophil clearance. In vivo, neutrophils were sequestered by endothelial cells after blockade of Kupffer cells, a process that was dependent upon both phosphatidylserine exposure and P-selectin expression. Thus, the ability of endothelial cells to clear senescent neutrophils may limit the procoagulant and/or inflammatory impact of these cells.
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Affiliation(s)
- Chunyan Gao
- Department of Medicine, The First Affiliated Hospital, Harbin Medical University, 23 Youzheng Street, Nangang District, Harbin 150001, China
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