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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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Ebeyer-Masotta M, Eichhorn T, Weiss R, Lauková L, Weber V. Activated Platelets and Platelet-Derived Extracellular Vesicles Mediate COVID-19-Associated Immunothrombosis. Front Cell Dev Biol 2022; 10:914891. [PMID: 35874830 PMCID: PMC9299085 DOI: 10.3389/fcell.2022.914891] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2022] [Accepted: 06/08/2022] [Indexed: 12/12/2022] Open
Abstract
Activated platelets and platelet-derived extracellular vesicles (EVs) have emerged as central players in thromboembolic complications associated with severe coronavirus disease 2019 (COVID-19). Platelets bridge hemostatic, inflammatory, and immune responses by their ability to sense pathogens via various pattern recognition receptors, and they respond to infection through a diverse repertoire of mechanisms. Dysregulated platelet activation, however, can lead to immunothrombosis, a simultaneous overactivation of blood coagulation and the innate immune response. Mediators released by activated platelets in response to infection, such as antimicrobial peptides, high mobility group box 1 protein, platelet factor 4 (PF4), and PF4+ extracellular vesicles promote neutrophil activation, resulting in the release of neutrophil extracellular traps and histones. Many of the factors released during platelet and neutrophil activation are positively charged and interact with endogenous heparan sulfate or exogenously administered heparin via electrostatic interactions or via specific binding sites. Here, we review the current state of knowledge regarding the involvement of platelets and platelet-derived EVs in the pathogenesis of immunothrombosis, and we discuss the potential of extracorporeal therapies using adsorbents functionalized with heparin to deplete platelet-derived and neutrophil-derived mediators of immunothrombosis.
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Affiliation(s)
- Marie Ebeyer-Masotta
- Center for Biomedical Technology, Department for Biomedical Research, University for Continuing Education Krems, Krems, Austria
| | - Tanja Eichhorn
- Center for Biomedical Technology, Department for Biomedical Research, University for Continuing Education Krems, Krems, Austria
| | - René Weiss
- Center for Biomedical Technology, Department for Biomedical Research, University for Continuing Education Krems, Krems, Austria
| | - Lucia Lauková
- Center for Biomedical Technology, Department for Biomedical Research, University for Continuing Education Krems, Krems, Austria
| | - Viktoria Weber
- Center for Biomedical Technology, Department for Biomedical Research, University for Continuing Education Krems, Krems, Austria
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3
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Impact of angiotensin-converting enzyme inhibition on platelet tissue factor expression in stroke-prone rats. J Hypertens 2019; 36:1360-1371. [PMID: 29470366 PMCID: PMC6037281 DOI: 10.1097/hjh.0000000000001702] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Supplemental Digital Content is available in the text Objective: Hypertension is a well known risk factor for thrombotic events such as myocardial infarction and stroke. Platelets express tissue factor (TF), the key activator of blood coagulation and thrombus formation. The number of TF-positive platelets increases in pathological conditions characterized by thrombotic complications but whether this occurs in hypertension is unknown. Here we investigated whether platelet TF expression is increased in a hypertensive status through a mechanism acting on megakaryocytes; the phenomenon could be modulated by antihypertensive drug as captopril; angiotensin (AngII) influences platelet TF expression. Methods: Spontaneously hypertensive stroke prone (SHRSP) rats received standard diet (StD) or a Japanese high-salt permissive diet (JpD). After 3 weeks, JpD animals were randomized to receive captopril or vehicle. Normotensive Wistar Kyoto (WKY) rats were used as controls. Cell-associated TF expression and activity were analyzed by flow cytometry and calibrated automated thrombogram, respectively. Results: Hypertensive StD-SHRSP showed an increased number of TF-positive platelets compared with normotensive WKY. After JpD administration, SHRSP developed severe hypertension and renal damage; the number of TF-positive megakaryocytes significantly increased compared with StD-SHRSP resulting in a higher number of TF-positive platelets with a faster kinetic of thrombin generation. These effects were reverted by captopril. Ex-vivo stimulation of platelets, isolated from normotensive WKY and from healthy individuals, with AngII induced a concentration-dependent increase of surface-associated TF expression. Conclusion: The current study shows for the first time that in hypertension the number of TF-positive megakaryocytes increases thus releasing in the circulation more platelets carrying a functionally active TF. AngII stimulates platelets to express TF.
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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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Canzano P, Rossetti L, Ferri N, Balduini A, Abbonante V, Boselli D, De Marco L, Di Minno M, Toschi V, Corsini A, Tremoli E, Brambilla M, Facchinetti L, Camera M. Human megakaryocytes confer tissue factor to a subset of shed platelets to stimulate thrombin generation. Thromb Haemost 2017; 114:579-92. [DOI: 10.1160/th14-10-0830] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2014] [Accepted: 04/11/2015] [Indexed: 11/05/2022]
Abstract
SummaryTissue factor (TF), the main activator of the blood coagulation cascade, has been shown to be expressed by platelets. Despite the evidence that both megakaryocytes and platelets express TF mRNA, and that platelets can make de novo protein synthesis, the main mechanism thought to be responsible for the presence of TF within platelets is through the uptake of TF positive microparticles. In this study we assessed 1) whether human megakaryocytes synthesise TF and transfer it to platelets and 2) the contribution of platelet-TF to the platelet hemostatic capacity. In order to avoid the cross-talk with circulating microparticles, we took advantage from an in vitro cultured megakaryoblastic cell line (Meg-01) able to differentiate into megakaryocytes releasing platelet-like particles. We show that functionally active TF is expressed in human megakaryoblasts, increased in megakaryocytes, and is transferred to a subset of shed platelets where it contributes to clot formation. These data were all confirmed in human CD34pos- derived megakaryocytes and in their released platelets. The effect of TF silencing in Meg-megakaryoblasts resulted in a significant reduction of TF expression in these cells and also in Meg-megakaryocytes and Meg-platelets. Moreover, the contribution of platelet-TF to the platelet hemostatic capacity was highlighted by the significant delay in the kinetic of thrombin formation observed in platelets released by TF-silenced megakaryocytes. These findings provide evidences that TF is an endogenously synthesised protein that characterises megakaryocyte maturation and that it is transferred to a subset of newly-released platelets where it is functionally active and able to trigger thrombin generation.
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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: 110] [Impact Index Per Article: 15.7] [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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Lopez-Vilchez I, Diaz-Ricart M, Galan AM, Roque M, Caballo C, Molina P, White JG, Escolar G. Internalization of Tissue Factor-Rich Microvesicles by Platelets Occurs Independently of GPIIb-IIIa, and Involves CD36 Receptor, Serotonin Transporter and Cytoskeletal Assembly. J Cell Biochem 2015. [DOI: 10.1002/jcb.25293] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Irene Lopez-Vilchez
- Department of Hemotherapy and Hemostasis; Hospital Clinic, Centre of Biomedical Diagnosis (CDB), Institute of Biomedical Research August Pi i Sunyer (IDIBAPS), University of Barcelona; 170 Villarroel Street Barcelona 08036 Spain
| | - Maribel Diaz-Ricart
- Department of Hemotherapy and Hemostasis; Hospital Clinic, Centre of Biomedical Diagnosis (CDB), Institute of Biomedical Research August Pi i Sunyer (IDIBAPS), University of Barcelona; 170 Villarroel Street Barcelona 08036 Spain
| | - Ana M. Galan
- Department of Hemotherapy and Hemostasis; Hospital Clinic, Centre of Biomedical Diagnosis (CDB), Institute of Biomedical Research August Pi i Sunyer (IDIBAPS), University of Barcelona; 170 Villarroel Street Barcelona 08036 Spain
| | - Merce Roque
- Institute Clinic of Thorax; Hospital Clinic, Institute of Biomedical Research August Pi i Sunyer (IDIBAPS), University of Barcelona, 170 Villarroel Street; Barcelona 08036 Spain
| | - Carolina Caballo
- Department of Hemotherapy and Hemostasis; Hospital Clinic, Centre of Biomedical Diagnosis (CDB), Institute of Biomedical Research August Pi i Sunyer (IDIBAPS), University of Barcelona; 170 Villarroel Street Barcelona 08036 Spain
| | - Patricia Molina
- Department of Hemotherapy and Hemostasis; Hospital Clinic, Centre of Biomedical Diagnosis (CDB), Institute of Biomedical Research August Pi i Sunyer (IDIBAPS), University of Barcelona; 170 Villarroel Street Barcelona 08036 Spain
| | - James G. White
- Departments of Laboratory and Clinical Medicine and Pediatrics; University of Minnesota; 420 Delaware Street S.E. Minneapolis Minnesota 55455
| | - Gines Escolar
- Department of Hemotherapy and Hemostasis; Hospital Clinic, Centre of Biomedical Diagnosis (CDB), Institute of Biomedical Research August Pi i Sunyer (IDIBAPS), University of Barcelona; 170 Villarroel Street Barcelona 08036 Spain
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Chou ML, Lin LT, Devos D, Burnouf T. Nanofiltration to remove microparticles and decrease the thrombogenicity of plasma: in vitro feasibility assessment. Transfusion 2015; 55:2433-44. [DOI: 10.1111/trf.13162] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2014] [Revised: 04/07/2015] [Accepted: 04/08/2015] [Indexed: 12/24/2022]
Affiliation(s)
- Ming-Li Chou
- Graduate Institute of Medical Sciences, College of Medicine, Taipei Medical University; Taipei Taiwan
| | - Liang-Tzung Lin
- Graduate Institute of Medical Sciences, College of Medicine, Taipei Medical University; Taipei Taiwan
- Department of Microbiology and Immunology; School of Medicine, College of Medicine, Taipei Medical University; Taipei Taiwan
| | - David Devos
- Service de Pharmacologie Médicale, EA 1046, Faculté de Médecine de Lille, Service de Neurologie, CHRU de Lille, Université Lille Nord de France; Lille France
| | - Thierry Burnouf
- Graduate Institute of Biomedical Materials and Tissue Engineering, College of Biomedical Engineering, Taipei Medical University; Taipei Taiwan
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Platelet microparticle: A sensitive physiological “fine tuning” balancing factor in health and disease. Transfus Apher Sci 2015; 52:12-8. [DOI: 10.1016/j.transci.2014.12.015] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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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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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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12
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Lopez-Vilchez I, Galan AM, Hernandez MR, Caballo C, Roque M, Diaz-Ricart M, White JG, Escolar G. Platelet-associated tissue factor enhances platelet reactivity and thrombin generation in experimental studies in vitro. Thromb Res 2012; 130:e294-300. [DOI: 10.1016/j.thromres.2012.10.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2012] [Revised: 10/05/2012] [Accepted: 10/17/2012] [Indexed: 12/13/2022]
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