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Li Y, Wang H, Zhao Z, Yang Y, Meng Z, Qin L. Effects of the interactions between platelets with other cells in tumor growth and progression. Front Immunol 2023; 14:1165989. [PMID: 37153586 PMCID: PMC10158495 DOI: 10.3389/fimmu.2023.1165989] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Accepted: 03/31/2023] [Indexed: 05/09/2023] Open
Abstract
It has been confirmed that platelets play a key role in tumorigenesis. Tumor-activated platelets can recruit blood cells and immune cells to migrate, establish an inflammatory tumor microenvironment at the sites of primary and metastatic tumors. On the other hand, they can also promote the differentiation of mesenchymal cells, which can accelerate the proliferation, genesis and migration of blood vessels. The role of platelets in tumors has been well studied. However, a growing number of studies suggest that interactions between platelets and immune cells (e.g., dendritic cells, natural killer cells, monocytes, and red blood cells) also play an important role in tumorigenesis and tumor development. In this review, we summarize the major cells that are closely associated with platelets and discuss the essential role of the interaction between platelets with these cells in tumorigenesis and tumor development.
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Manuchehrfar F, Tian W, Chou T, Liang J. Evolution of Coagulation-Fragmentation Stochastic Processes Using Accurate Chemical Master Equation Approach. COMMUNICATIONS IN INFORMATION AND SYSTEMS 2019; 19:37-55. [PMID: 34421394 DOI: 10.4310/cis.2019.v19.n1.a3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Coagulation and fragmentation (CF) is a fundamental process in which smaller particles attach to each other to form larger clusters while existing clusters break up into smaller particles . It is a ubiquitous process that plays important roles in many physical and biological phenomena. CF is typically a stochastic process that often occurs in confined spaces with a limited number of available particles . Here, we study the CF process formulated with the discrete Chemical Master Equation (dCME). Using the newly developed Accurate Chemical Master Equation (ACME) method, we examine the time-dependent behavior of the CF system. We investigate the effects of a number of important factors that influence the overall behavior of the system, including the dimensionality, the ratio of attachment to detachment rates among clusters, and the initial conditions. By comparing CF in one and three dimensions, we conclude that systems in three dimensions are more likely to form large clusters. We also demonstrate how the ratio of the attachment to detachment rates affects the dynamics and the steady-state of the system. Finally, we demonstrate the relationship between the formation of large clusters and the initial condition.
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Affiliation(s)
- Farid Manuchehrfar
- Department of Bioengineering, University of Illinois at Chicago (UIC), Chicago, Illinois, USA
| | - Wei Tian
- Department of Bioengineering, University of Illinois at Chicago (UIC), Chicago, Illinois, USA
| | - Tom Chou
- Departments of Biomathematics and Mathematics, University of California at Los Angeles (UCLA), Los Angeles, California
| | - Jie Liang
- Department of Bioengineering, University of Illinois at Chicago (UIC), Chicago, Illinois, USA
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Sperling C, Maitz MF, Grasso S, Werner C, Kanse SM. A Positively Charged Surface Triggers Coagulation Activation Through Factor VII Activating Protease (FSAP). ACS APPLIED MATERIALS & INTERFACES 2017; 9:40107-40116. [PMID: 29091393 DOI: 10.1021/acsami.7b14281] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Contact between biomedical materials and blood often initiates undesirable pro-coagulant and pro-inflammatory processes. On negatively charged materials, blood coagulation is known to be triggered through autoactivation of Factor XII, while activation on cationic surfaces follows a distinct and so far enigmatic mechanism. Because Factor VII activating protease (FSAP) is known to be activated on positively and on negatively charged macromolecules in plasma, we have investigated its interaction with charged biomaterials and its consequences for coagulation. Several activation processes in blood and plasma were characterized after contact with material surfaces with varied charge. FSAP was found to be exclusively activated by the positively charged surfaces polyethylenimine (PEI) and poly-l-lysine (PLL), not by the negatively charged glass or self-assembled monolayer with carboxyl group termination (SAM-COOH), as well as uncharged (Teflon AF) surfaces. Whole blood incubation on PEI showed that this activation was concomitant with coagulation as determined by thrombin and fibrin formation, which was high for glass (F1+2, 138 nM) and PEI (F1+2, 44 nM) but low for Teflon AF (F1+2, 3.3 nM) and SAM COOH (F1+2, 5.8 nM). Contact phase inhibitor diminished coagulation to background levels for all surfaces except PEI (F1+2: ^PEI 43 to 25 nM; glass, 58 to 1.5 nM) indicating that coagulation activation is not dependent on FXII activation on the PEI surface. A decisive role of endogenous FSAP for coagulation however was confirmed with the use of FSAP inhibitory antibodies which showed no influence on Teflon AF, glass and SAM COOH but diminished F1+2 on PEI to less than 50%. We propose that FSAP activation could be a novel mechanism of surface-driven coagulation. An inhibition of this protease might improve hemocompatibility of cationic surfaces and therefore facilitate the application of polycationic surfaces in blood.
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Affiliation(s)
- Claudia Sperling
- Institute Biofunctional Polymer Materials, Max Bergmann Center of Biomaterials, Leibniz-Institut für Polymerforschung Dresden e.V. Hohe Strasse 6, 01069 Dresden, Germany
| | - Manfred F Maitz
- Institute Biofunctional Polymer Materials, Max Bergmann Center of Biomaterials, Leibniz-Institut für Polymerforschung Dresden e.V. Hohe Strasse 6, 01069 Dresden, Germany
| | - Simona Grasso
- Oslo University Hospital and University of Oslo , 0372 Oslo, Norway
| | - Carsten Werner
- Institute Biofunctional Polymer Materials, Max Bergmann Center of Biomaterials, Leibniz-Institut für Polymerforschung Dresden e.V. Hohe Strasse 6, 01069 Dresden, Germany
| | - Sandip M Kanse
- Oslo University Hospital and University of Oslo , 0372 Oslo, Norway
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Kiouptsi K, Reinhardt C. Protein disulfide-isomerase – a trigger of tissue factor-dependent thrombosis. Clin Hemorheol Microcirc 2017; 64:279-286. [DOI: 10.3233/ch-168106] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Gremmel T, Ay C, Riedl J, Kopp CW, Eichelberger B, Koppensteiner R, Panzer S. Platelet-specific markers are associated with monocyte-platelet aggregate formation and thrombin generation potential in advanced atherosclerosis. Thromb Haemost 2015; 115:615-21. [PMID: 26467184 DOI: 10.1160/th15-07-0598] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Accepted: 10/08/2015] [Indexed: 12/20/2022]
Abstract
Platelet activation and thrombin generation are crucial steps in primary and secondary haemostasis. However, both also play major roles in intravascular thrombus formation and therefore in the development of adverse cardiovascular events. In the current study, we first sought to investigate the associations of the platelet biomarkers platelet factor (PF)-4, thrombospondin (TSP)-1, soluble CD40 ligand (sCD40L), and soluble P-selectin (sP-selectin) with each other and with monocyte-platelet aggregate (MPA) formation in 316 patients undergoing angioplasty and stenting. To better understand the interplay between platelet activation and thrombin generation, we subsequently investigated the associations of the platelet biomarkers with thrombin generation potential. The mostly platelet-specific markers PF-4, TSP-1 and sCD40L correlated strongly with each other (all p < 0.001), and the best correlation was observed between PF-4 and TSP-1 (r=0.91). In contrast, sP-selectin, which derives from platelets and endothelial cells, correlated rather poorly with TSP-1 (r=0.12, p=0.04), and did not correlate with PF-4 and sCD40L. While PF-4, TSP-1 and sP-selectin correlated significantly with in vivo MPA formation (all p< 0.001), no such association was found between sCD40L and MPA formation. PF-4, TSP-1 and sCD40L correlated strongly with peak thrombin generation (all p< 0.001) with the best correlation between PF-4 and peak thrombin generation (r=0.55), whereas sP-selectin did not correlate with peak thrombin generation. Likewise, PF-4, TSP-1 and sCD40L correlated significantly with the area under the thrombin generation curve (AUC; all p< 0.01), whereas sP-selectin did not correlate with the AUC. In conclusion, platelet-specific markers are associated with MPA formation and thrombin generation potential in patients with advanced atherosclerosis.
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Affiliation(s)
- Thomas Gremmel
- Prof. Dr. Thomas Gremmel, MD, Division of Angiology, Department of Internal Medicine II, Medical University of Vienna, Waehringer Guertel 18-20, 1090 Vienna, Austria, Tel.: +43 1 40400 46710, Fax: +43 1 40400 46650, E-mail:
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6
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Barboza T, Gomes T, Mizurini DM, Monteiro RQ, König S, Francischetti IMB, Signoretti PVP, Ramos IP, Gutfilen B, Souza SAL. (99m)Tc-ixolaris targets glioblastoma-associated tissue factor: in vitro and pre-clinical applications. Thromb Res 2015; 136:432-9. [PMID: 26070446 DOI: 10.1016/j.thromres.2015.05.032] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2014] [Revised: 04/18/2015] [Accepted: 05/30/2015] [Indexed: 11/18/2022]
Abstract
BACKGROUND The clotting initiator protein tissue factor (TF) has recently been described as a potential target that can be exploited to image aggressive tumors. Ixolaris is a specific TF inhibitor that blocks tumor cell procoagulant activity and tumor growth. OBJECTIVE Herein we evaluated the ability of (99m)Tc-ixolaris to target tumor-derived TF using an orthotopic glioblastoma (GBM) model in mice. METHODS The right forebrains of Swiss mice were stereotactically inoculated with U87-MG human GBM cells. Histological and immunohistochemical analyses were performed on the resulting tumors after 35-45 days. The biodistribution of (99m)Tc-ixolaris was evaluated by semi-quantitative whole-body scintigraphy and a quantitative analysis of radioactivity in isolated organs. RESULTS No (99m)Tc-ixolaris uptake was observed in brain of tumor-free mice, independently of the integrity of brain-blood barrier. In contrast, the presence of TF-expressing brain tumor masses determined a significant (99m)Tc-ixolaris uptake. CONCLUSION (99m)Tc-ixolaris recognized TF-expressing GBM cells in vivo. Given the proposed role of TF in tumor progression, (99m)Tc-ixolaris is a promising radiopharmaceutical agent for quantifying cancer-associated TF in aggressive tumors, including GBM.
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Affiliation(s)
- Thiago Barboza
- Laboratório de Marcação de Células e Moléculas, Departamento de Radiologia, Hospital Universitário Clementino Fraga Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brasil
| | - Tainá Gomes
- Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brasil; Instituto de Bioquímica Médica Leopoldo de Meis, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brasil
| | - Daniella M Mizurini
- Instituto de Bioquímica Médica Leopoldo de Meis, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brasil
| | - Robson Q Monteiro
- Instituto de Bioquímica Médica Leopoldo de Meis, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brasil
| | - Sandra König
- Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brasil
| | - Ivo M B Francischetti
- Vector Biology Section, Laboratory of Malaria and Vector Research, National Institutes of Health, Bethesda, MD, USA
| | - Paula V P Signoretti
- Laboratório de Físico-Química Biológica Aída Hassón Voloch e Laboratório Intermediário de Biomembranas, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brasil
| | - Isalira P Ramos
- Laboratório de Cardiologia Celular e Molecular, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brasil
| | - Bianca Gutfilen
- Laboratório de Marcação de Células e Moléculas, Departamento de Radiologia, Hospital Universitário Clementino Fraga Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brasil
| | - Sergio A L Souza
- Laboratório de Marcação de Células e Moléculas, Departamento de Radiologia, Hospital Universitário Clementino Fraga Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brasil.
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7
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High intravascular tissue factor expression in dogs with idiopathic immune-mediated haemolytic anaemia. Vet Immunol Immunopathol 2011; 144:346-54. [DOI: 10.1016/j.vetimm.2011.08.010] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2011] [Revised: 08/11/2011] [Accepted: 08/11/2011] [Indexed: 02/07/2023]
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8
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A multiscale model of venous thrombus formation with surface-mediated control of blood coagulation cascade. Biophys J 2010; 98:1723-32. [PMID: 20441735 DOI: 10.1016/j.bpj.2009.12.4331] [Citation(s) in RCA: 87] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2009] [Revised: 12/15/2009] [Accepted: 12/28/2009] [Indexed: 11/22/2022] Open
Abstract
A combination of the extended multiscale model, new image processing algorithms, and biological experiments is used for studying the role of Factor VII (FVII) in venous thrombus formation. A detailed submodel of the tissue factor pathway of blood coagulation is introduced within the framework of the multiscale model to provide a detailed description of coagulation cascade. Surface reactions of the extrinsic coagulation pathway on membranes of platelets are studied under different flow conditions. It is shown that low levels of FVII in blood result in a significant delay in thrombin production, demonstrating that FVII plays an active role in promoting thrombus development at an early stage.
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Maroney SA, Ellery PE, Mast AE. Alternatively spliced isoforms of tissue factor pathway inhibitor. Thromb Res 2010; 125 Suppl 1:S52-6. [PMID: 20176395 DOI: 10.1016/j.thromres.2010.01.038] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Tissue factor pathway inhibitor (TFPI) is the major regulator of tissue factor (TF)-induced coagulation. It down regulates coagulation by binding to the TF/fVIIa complex in a fXa dependent manner. It is predominantly produced by microvascular endothelial cells, though it is also found in platelets, monocytes, smooth muscle cells, and plasma. Its physiological importance is demonstrated by the embryonic lethality observed in TFPI knockout mice and by the increase in thrombotic burden that occurs when heterozygous TFPI mice are bred with mice carrying genetic risk factors for thrombotic disease, such as factor V Leiden. Multiple TFPI isoforms, termed TFPIalpha, TFPIbeta, and TFPIdelta in humans and TFPIalpha, TFPIbeta, and TFPIgamma in mice, have been described, which differ in their domain structure and method for cell surface attachment. A significant functional difference between these isoforms has yet to be described in vivo. Both human and mouse tissues produce, on average, approximately 10 times more TFPIalpha message when compared to that of TFPIbeta. Consistent with this finding, several lines of evidence suggest that TFPIalpha is the predominant protein isoform in humans. In contrast, recent work from our laboratory demonstrates that TFPIbeta is the major protein isoform produced in adult mice, suggesting that TFPI isoform production is translationally regulated.
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Affiliation(s)
- Susan A Maroney
- Blood Research Institute, Blood Center of Wisconsin, 8727 Watertown Plank Road, Milwaukee, WI 53226-3548, USA
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10
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Cho Y, Rickles FR, Parver LM, Tuo J, Chan CC. The potential pathophysiological role of tissue factor in age-related macular degeneration. EXPERT REVIEW OF OPHTHALMOLOGY 2010. [DOI: 10.1586/eop.09.58] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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11
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Mezzano D, Matus V, Sáez CG, Pereira J, Panes O. Tissue factor storage, synthesis and function in normal and activated human platelets. Thromb Res 2008; 122 Suppl 1:S31-6. [PMID: 18691497 DOI: 10.1016/s0049-3848(08)70016-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
The source and significance of blood-borne tissue factor (TF) are controversial. The presence of TF in platelets was initially attributed to transfer of the protein from other cells (e.g., monocytes) and/or TF-bearing microparticles. Recently, TF-mRNA, neo-synthesis of the protein and TF-dependent procoagulant activity (PCA) have been reported in human platelets. The storage of "encrypted", potentially active TF in circulating, non-stimulated platelets remains debatable. One report strongly suggests that the starting of platelet PCA depends on de novo TF synthesis induced by platelet activation, whereas others provide persuasive evidence that platelets circulate with preformed TF, readily functional upon demand. These findings may have an impact on our current ideas of physiological hemostasis and thrombus formation. In fact, platelets would lead not only the formation of the primary plug, but in this microenvironment they would also contribute to the triggering of thrombin generation, fibrin deposition, clot consolidation and initial protection from fibrinolysis. Much research is needed to validate this platelet-based hemostasis model.
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Affiliation(s)
- Diego Mezzano
- Department of Hematology-Oncology, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile.
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12
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Warren OJ, Smith AJ, Alexiou C, Rogers PLB, Jawad N, Vincent C, Darzi AW, Athanasiou T. The inflammatory response to cardiopulmonary bypass: part 1--mechanisms of pathogenesis. J Cardiothorac Vasc Anesth 2008; 23:223-31. [PMID: 18930659 DOI: 10.1053/j.jvca.2008.08.007] [Citation(s) in RCA: 217] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/23/2008] [Indexed: 01/17/2023]
Affiliation(s)
- Oliver J Warren
- Department of BioSurgery and Surgical Technology, Imperial College London, London, United Kingdom
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Abstract
Recently, the presence of functionally active tissue factor (TF) in platelets has been reported by several groups. In this location, TF is postulated to play an important role in the propagation phase of thrombus formation. Although the existence of platelet TF still remains controversial to some extent, a review of the current literature proposes at least three distinct sources of "platelet-associated TF" in those laboratories that have reported its presence: (1) TF that is taken up in the form of circulating microparticles, usually derived from monocytes; (2) TF stored in the alpha-granules of platelets that may have been taken up and/or endogenously synthesized; and (3) TF that is synthesized and expressed on the plasma membrane of mature platelets. These pathways are not mutually exclusive, and the dominant mechanism may depend on the state of platelet activation and, possibly, on other host factors that differ in physiological hemostasis versus pathological thrombosis. This brief review will summarize the state-of-the-art understanding on the origins and possible role of platelet TF.
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Affiliation(s)
- Nigel S Key
- Department of Medicine, Division of Hematology/Oncology, University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, NC, USA.
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Reinhardt C, von Brühl ML, Manukyan D, Grahl L, Lorenz M, Altmann B, Dlugai S, Hess S, Konrad I, Orschiedt L, Mackman N, Ruddock L, Massberg S, Engelmann B. Protein disulfide isomerase acts as an injury response signal that enhances fibrin generation via tissue factor activation. J Clin Invest 2008; 118:1110-22. [PMID: 18274674 DOI: 10.1172/jci32376] [Citation(s) in RCA: 137] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2007] [Accepted: 12/19/2007] [Indexed: 11/17/2022] Open
Abstract
The activation of initiator protein tissue factor (TF) is likely to be a crucial step in the blood coagulation process, which leads to fibrin formation. The stimuli responsible for inducing TF activation are largely undefined. Here we show that the oxidoreductase protein disulfide isomerase (PDI) directly promotes TF-dependent fibrin production during thrombus formation in vivo. After endothelial denudation of mouse carotid arteries, PDI was released at the injury site from adherent platelets and disrupted vessel wall cells. Inhibition of PDI decreased TF-triggered fibrin formation in different in vivo murine models of thrombus formation, as determined by intravital fluorescence microscopy. PDI infusion increased - and, under conditions of decreased platelet adhesion, PDI inhibition reduced - fibrin generation at the injury site, indicating that PDI can directly initiate blood coagulation. In vitro, human platelet-secreted PDI contributed to the activation of cryptic TF on microvesicles (microparticles). Mass spectrometry analyses indicated that part of the extracellular cysteine 209 of TF was constitutively glutathionylated. Mixed disulfide formation contributed to maintaining TF in a state of low functionality. We propose that reduced PDI activates TF by isomerization of a mixed disulfide and a free thiol to an intramolecular disulfide. Our findings suggest that disulfide isomerases can act as injury response signals that trigger the activation of fibrin formation following vessel injury.
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Affiliation(s)
- Christoph Reinhardt
- Vaskuläre Biologie und Hämostase, Institut für Klinische Chemie, Ludwig-Maximilians-Universität, Munich, Germany
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Warren OJ, Darzi AW, Athanasiou T. Recombinant activated factor VII in cardiac surgery - first, do no harm. J Cardiothorac Surg 2007; 2:50. [PMID: 18036233 PMCID: PMC2170438 DOI: 10.1186/1749-8090-2-50] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2007] [Accepted: 11/24/2007] [Indexed: 11/10/2022] Open
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Panes O, Matus V, Sáez CG, Quiroga T, Pereira J, Mezzano D. Human platelets synthesize and express functional tissue factor. Blood 2007; 109:5242-50. [PMID: 17347408 DOI: 10.1182/blood-2006-06-030619] [Citation(s) in RCA: 161] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
AbstractThe source and significance of bloodborne tissue factor (TF) are controversial. TF mRNA, protein, and TF-dependent procoagulant activity (PCA) have been detected in human platelets, but direct evidence of TF synthesis is missing. Nonstimulated monocyte-free platelets from most patients expressed TF mRNA, which was enhanced or induced in all of them after platelet activation. Immunoprecipitation assays revealed TF protein (mainly of a molecular weight [Mr] of approximately 47 kDa, with other bands of approximately 35 and approximately 60 kDa) in nonstimulated platelet membranes, which also increased after activation. This enhancement was concomitant with TF translocation to the plasma membrane, as demonstrated by immunofluorescence–confocal microscopy and biotinylation of membrane proteins. Platelet PCA, assessed by factor Xa (FXa) generation, was induced after activation and was inhibited by 48% and 76% with anti-TF and anti-FVIIa, respectively, but not by intrinsic pathway inhibitors. Platelets incorporated [35S]-methionine into TF proteins with Mr of approximately 47 kDa, approximately 35 kDa, and approximately 60 kDa, more intensely after activation. Puromycin but not actinomycin D or DRB (5,6-dichloro-1-beta-D-ribofuranosylbenzimidazole) inhibited TF neosynthesis. Thus, human platelets not only assemble the clotting reactions on their membrane, but also supply their own TF for thrombin generation in a timely and spatially circumscribed process. These observations simplify, unify, and provide a more coherent formulation of the current cell-based model of hemostasis.
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Affiliation(s)
- Olga Panes
- Department of Hematology-Oncology, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
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Warren O, Mandal K, Hadjianastassiou V, Knowlton L, Panesar S, John K, Darzi A, Athanasiou T. Recombinant Activated Factor VII in Cardiac Surgery: A Systematic Review. Ann Thorac Surg 2007; 83:707-14. [PMID: 17258029 DOI: 10.1016/j.athoracsur.2006.10.033] [Citation(s) in RCA: 104] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/01/2006] [Revised: 10/11/2006] [Accepted: 10/13/2006] [Indexed: 11/23/2022]
Abstract
Postoperative hemorrhage is a common complication in cardiac surgery, and it is associated with a considerable increase in morbidity, mortality, and cost. Recombinant activated factor VII (rFVIIa) is an emerging hemostatic agent, increasingly used in cardiac surgery. This article systematically reviews the evidence regarding the efficacy, safety, and cost of rFVIIa in this setting. Although definitive evidence from randomized controlled trials is lacking, the use of rFVIIa in patients experiencing refractory postoperative hemorrhage seems promising and relatively safe. However further research is required to definitively establish its clinical utility in the postoperative cardiac patient.
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Affiliation(s)
- Oliver Warren
- Department of BioSurgery and Surgical Technology, Imperial College Faculty of Medicine, St. Mary's Hospital, London, United Kingdom
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