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https://www.readbyqxmd.com/read/28205396/can-the-diagnostic-reliability-of-the-thrombin-generation-test-as-a-global-haemostasis-assay-be-improved-the-impact-of-calcium-chloride-concentration
#1
L A Parunov, S S Surov, Y Liang, T K Lee, M V Ovanesov
BACKGROUND: Thrombin generation test (TGT) is a global haemostasis assay with a potential to predict bleeding tendencies and treatment effects in patients with haemophilia. Despite 15 years of clinical research, the diagnostic value of TGT remains controversial, possibly due to suboptimal sensitivity to coagulation deficiencies, robustness and reproducibility. OBJECTIVE: The goal of this study was to explore the effect of calcium chloride (CaCl2 ) concentration on the TGT's response to intrinsic coagulation factors (F) VIII, IX and XIa...
February 15, 2017: Haemophilia: the Official Journal of the World Federation of Hemophilia
https://www.readbyqxmd.com/read/28199364/coagulation-profile-in-patients-undergoing-video-assisted-thoracoscopic-lobectomy-a-randomized-controlled-trial
#2
Thomas Decker Christensen, Henrik Vad, Søren Pedersen, Kåre Hornbech, Nora Elisabeth Zois, Peter B Licht, Mads Nybo, Anne-Mette Hvas
BACKGROUND: Knowledge about the impact of Low-Molecular-Weight Heparin (LMWH) on the coagulation system in patients undergoing minimal invasive lung cancer surgery is sparse. The aim of this study was to assess the effect of LMWH on the coagulation system in patients undergoing Video-Assisted Thoracoscopic Surgery (VATS) lobectomy for primary lung cancer. METHODS: Sixty-three patients diagnosed with primary lung cancer undergoing VATS lobectomy were randomized to either subcutaneous injection with dalteparin (Fragmin®) 5000 IE once daily or no intervention...
2017: PloS One
https://www.readbyqxmd.com/read/28196451/phenotypic-and-genetic-analysis-of-dysprothrombinemia-due-to-a-novel-homozygous-mutation
#3
Kankan Su, Yanhui Jin, Zhihai Miao, Xiaoli Cheng, Lihong Yang, Mingshan Wang
OBJECTIVE: We study the phenotype and genotype of a novel gene mutation of factor II (FII) that leads to dysprothrombinemia, and do the meta-analysis to illuminate its molecular pathogenesis. It will further contribute to our comprehension of the pathogenesis of this type of disease. METHODS: The prothrombin time (PT), activated partial thromboplastin time (APTT) and the activities of other factors were determined by the one-stage clotting method. The prothrombin antigen was measured with enzyme-linked immunosorbent assay (ELISA)...
February 14, 2017: Hematology (Amsterdam, Netherlands)
https://www.readbyqxmd.com/read/28192448/differential-inhibitory-action-of-apixaban-on-platelet-and-fibrin-components-of-forming-thrombi-studies-with-circulating-blood-and-in-a-platelet-based-model-of-thrombin-generation
#4
Lluis Pujadas-Mestres, Irene Lopez-Vilchez, Eduardo Arellano-Rodrigo, Joan Carles Reverter, Antonio Lopez-Farre, Maribel Diaz-Ricart, Juan Jose Badimon, Gines Escolar
INTRODUCTION: Mechanisms of action of direct oral anticoagulants (DOAC) suggest a potential therapeutic use in the prevention of thrombotic complications in arterial territories. However, effects of DOACs on platelet activation and aggregation have not been explored in detail. We have investigated the effects of apixaban on platelet and fibrin components of thrombus formation under static and flow conditions. METHODS: We assessed the effects of apixaban (10, 40 and 160 ng/mL) on: 1) platelet deposition and fibrin formation onto a thrombogenic surface, with blood circulating at arterial shear-rates; 2) viscoelastic properties of forming clots, and 3) thrombin generation in a cell-model of coagulation primed by platelets...
2017: PloS One
https://www.readbyqxmd.com/read/28190562/a-combined-approach-to-early-detect-in-vitro-drug-induced-hemostatic-changes-in-preclinical-safety
#5
Myriam Defontis, Serge Côté, David Ledieu
Early detection of drug-induced alterations of hemostasis is challenging. Drugs can affect different components of the Virchow's triad and measurement of plasmatic coagulation times lacks sensitivity. New techniques for a more global assessment of the hemostasis are now available: the impedance platelet aggregometry, the thromboelastography and the thrombin generation measurement. The aim of this study was to evaluate three techniques (i.e.: Multiplate(®), TEG(®) and CAT) for the in vitro detection of the effect of a drug known to induce hemostatic alterations in a preclinical safety environment...
February 9, 2017: Experimental and Toxicologic Pathology: Official Journal of the Gesellschaft Für Toxikologische Pathologie
https://www.readbyqxmd.com/read/28166112/endogenous-thrombin-potential-as-marker-of-procoagulant-response-that-can-be-useful-in-early-stage-of-sepsis
#6
Dunja Mihajlovic, Snezana Brkic, Dajana Lendak, Aleksandra Novakov Mikic, Biljana Draskovic, Gorana Mitic
Sepsis is associated with complex procoagulant and anticoagulant changes that modify inflammatory response. Identification of coagulation markers that can differentiate useful procoagulant response from adverse alteration of clotting mechanism in patient with sepsis. In total, 150 patients who fulfilled criteria for diagnosis of sepsis were included in this study. Patients were categorized in two groups according to sepsis severity in the first 24 h from intensive care unit admission: sepsis and septic shock...
February 3, 2017: Blood Coagulation & Fibrinolysis: An International Journal in Haemostasis and Thrombosis
https://www.readbyqxmd.com/read/28164577/clinical-and-experimental-analysis-of-platelet-micro-particles-inducing-thrombosis-after-coronary-stenting
#7
Muyesai Nijiati, Abulijiang Saidaming, Adelijiang Tuohuti, Li Guoqing, Du Rong
BACKGROUND: A limited number of reports are analyzing the etiology and the mechanism of coronary heart disease by examining the source cells of micro particles (MPs) in coronary heart disease patients with percutaneous coronary intervention (PCI). This study aims to explore the circulating platelet micro particles (PMPs) content variation in the blood stream and the mechanism of MPs-inducing thrombosis in patients operated with coronary stenting, with the intent to analyze the impact of PMPs on thrombosis and in-stent restenosis...
September 1, 2016: Clinical Laboratory
https://www.readbyqxmd.com/read/28164533/possibility-of-coagulation-system-activation-determination-with-tissue-factor-in-pregnancy-complications
#8
Ludek Slavik, Martin Novak, Jana Ulehlova, Martin Prochazka, Jana Prochazkova, Veronika Lattova, Petr Polak, Radovan Pilka
BACKGROUND: In this part of the study, where we determined the causes of preeclampsia and other obstetric complications, we focused on the role of tissue factor (TF) in the activation of these pathophysiological processes. Recent findings attribute a significant part of the activation of coagulation creation of autoantibodies. Once this mechanism is activated, the antibodies induce expression of tissue factor (TF, CD142) on monocytes and vascular endothelial cells. METHODS: We have proposed a monitor activation model of the coagulation system in preeclampsia and other pregnancy complications using TF expression on monocytes by flow cytometry and simultaneous determination the TF-induced thrombin generation in plasma...
October 1, 2016: Clinical Laboratory
https://www.readbyqxmd.com/read/28159824/novel-thrombolytic-drug-based-on-thrombin-cleavable-microplasminogen-coupled-to-a-single-chain-antibody-specific-for-activated-gpiib-iiia
#9
Thomas Bonnard, Zachary Tennant, Be'Eri Niego, Ruchi Kanojia, Karen Alt, Shweta Jagdale, Lok Soon Law, Sheena Rigby, Robert Lindsay Medcalf, Karlheinz Peter, Christoph Eugen Hagemeyer
BACKGROUND: Thrombolytic therapy for acute thrombosis is limited by life-threatening side effects such as major bleeding and neurotoxicity. New treatment options with enhanced fibrinolytic potential are therefore required. Here, we report the development of a new thrombolytic molecule that exploits key features of thrombosis. We designed a recombinant microplasminogen modified to be activated by the prothrombotic serine-protease thrombin (HtPlg), fused to an activation-specific anti-glycoprotein IIb/IIIa single-chain antibody (SCE5), thereby hijacking the coagulation system to initiate thrombolysis...
February 3, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/28159767/ticagrelor-reversal-in-vitro-assessment-of-four-haemostatic-agents
#10
Leyla Calmette, Anne-Céline Martin, Bernard Le Bonniec, Diane Zlotnik, Isabelle Gouin-Thibault, Christilla Bachelot-Loza, Pascale Gaussem, Anne Godier
AIM: Management of ticagrelor-induced bleeding is challenging as platelet transfusion is ineffective. An effective strategy is needed. This study aimed to investigate in vitro the efficacy of four haemostatic drugs (HDs), namely recombinant activated factor VII (rFVIIa), fibrinogen concentrate (Fib), tranexamic acid (TXA) and factor XIII concentrate (FXIII) to improve the haemostatic capacity in the presence of ticagrelor. METHODS: Blood was spiked with ticagrelor then supplemented by either HD or control...
February 3, 2017: Journal of Clinical Pathology
https://www.readbyqxmd.com/read/28158181/platelet-full-length-tfpi-%C3%AE-in-healthy-volunteers-is-not-affected-by-sex-or-hormonal-use
#11
Kristien Winckers, Stella Thomassen, Hugo Ten Cate, Tilman M Hackeng
BACKGROUND: Only 10% of plasma TFPIα (TFPI) exists in the full length form, the rest circulates as a C-terminally truncated form. However, blood platelets exclusively contain full length TFPI, which is released at the site of injury upon platelet activation, and which could play an important local regulatory role in thrombin generation and prevention of thrombosis. METHODS: The anticoagulant activities of full length and truncated TFPI were investigated using thrombin generation assays...
2017: PloS One
https://www.readbyqxmd.com/read/28151805/comparison-of-tissue-factor-expression-and-activity-in-foetal-and-adult-endothelial-cells
#12
Mary E W Collier, Atinuke Akinmolayan, Alison H Goodall
Tissue factor (TF) is not usually expressed by endothelial cells but can be induced in these cells by inflammatory cytokines. Many studies have used human umbilical vein endothelial cells (HUVEC) as a model to examine the regulation of TF expression. However, there is a question as to whether this reflects TF expression in adult endothelial cells. This study compared TF expression and the release of TF-positive microvesicles in HUVEC and adult human dermal blood endothelial cells (HDBEC) in response to tumour necrosis factor α (TNFα) and interleukin-1 β (IL-1β)...
February 1, 2017: Blood Coagulation & Fibrinolysis: An International Journal in Haemostasis and Thrombosis
https://www.readbyqxmd.com/read/28150855/fibrin-clot-structure-pro-fibrinolytic-effect-of-oral-contraceptives-in-apparently-healthy-women
#13
Johannes J Sidelmann, Cornelis Kluft, Andrea H Krug, Ulrich Winkler, Jørgen Jespersen, Jørgen B Gram
Fibrin metabolism is influenced by many factors. The velocity of fibrin formation, genetic polymorphisms, fibrinolytic features and the structure of the fibrin clot are determinants of fibrin turnover. Oral contraceptives (OCs) have significant impact on the haemostatic system, by increasing the concentration of coagulation factors, plasminogen and tissue plasminogen activator activity, and decreasing the concentration of haemostatic inhibitors. The present study addresses the influence of OCs on fibrin structure and fibrin metabolism...
February 2, 2017: Thrombosis and Haemostasis
https://www.readbyqxmd.com/read/28150310/plasma-treated-with-amotosalen-and-ultraviolet-a-light-retains-activity-for-hemostasis-after-5-days-post-thaw-storage-at-1-to-6-o-c
#14
Anna Erickson, Katie Waldhaus, Tovo David, Norman Huang, Salvador Rico, Laurence Corash, Nina Mufti, Richard J Benjamin
BACKGROUND: Plasma thawed and stored at 1 to 6(°) C for up to 5 days (thawed plasma [TP]) provides rapid availability in emergencies and reduces plasma waste, but it carries risks of coagulation factor loss or activation, bacterial outgrowth, and viral contamination. We characterized changes in amotosalen/ultraviolet A (UVA) light pathogen-reduced, fresh-frozen plasma (FFP) and plasma frozen within 24 hours (PF24) with post-thaw storage. STUDY DESIGN AND METHODS: Amotosalen/UVA light-treated FFP and PF24 were thawed after approximately 3 to more than 12 months of frozen storage and held at 1 to 6(°) C for 5 days...
February 1, 2017: Transfusion
https://www.readbyqxmd.com/read/28148841/platelet-localized-fxi-promotes-a-vascular-coagulation-inflammatory-circuit-in-arterial-hypertension
#15
Sabine Kossmann, Jeremy Lagrange, Sven Jäckel, Kerstin Jurk, Moritz Ehlken, Tanja Schönfelder, Yvonne Weihert, Maike Knorr, Moritz Brandt, Ning Xia, Huige Li, Andreas Daiber, Matthias Oelze, Christoph Reinhardt, Karl Lackner, Andras Gruber, Brett Monia, Susanne H Karbach, Ulrich Walter, Zaverio M Ruggeri, Thomas Renné, Wolfram Ruf, Thomas Münzel, Philip Wenzel
Multicellular interactions of platelets, leukocytes, and the blood vessel wall support coagulation and precipitate arterial and venous thrombosis. High levels of angiotensin II cause arterial hypertension by a complex vascular inflammatory pathway that requires leukocyte recruitment and reactive oxygen species production and is followed by vascular dysfunction. We delineate a previously undescribed, proinflammatory coagulation-vascular circuit that is a major regulator of vascular tone, blood pressure, and endothelial function...
February 1, 2017: Science Translational Medicine
https://www.readbyqxmd.com/read/28148395/tissue-factor-factor-viia-complex-triggers-protease-activated-receptor-2-dependent-growth-factor-release-and-migration-in-ovarian-cancer
#16
Alice Chanakira, Pamela R Westmark, Irene M Ong, John P Sheehan
OBJECTIVE: Enhanced tissue factor (TF) expression in epithelial ovarian cancer (EOC) is associated with aggressive disease. Our objective was to evaluate the role of the TF-factor VIIa-protease-activated receptor-2 (PAR-2) pathway in human EOC. METHODS: TCGA RNAseq data from EOC databases were analyzed for PAR expression. Cell and microparticle (MP) associated TF protein expression (Western blot) and MP-associated coagulant activity were determined in human EOC (SKOV-3, OVCAR-3 and CaOV-3) and control cell lines...
January 29, 2017: Gynecologic Oncology
https://www.readbyqxmd.com/read/28145534/thrombin-generation-a-potentially-useful-biomarker-of-thrombotic-risk-in-philadelphia-negative-myeloproliferative-neoplasms
#17
Romeo-Gabriel Mihaila
The diagnosis of essential thrombocythemia and polycythemia vera is often made during a thrombotic event which can be serious. Philadelphia-negative chronic myeloproliferative neoplasia patients have an increased thrombotic risk. This is assessed using various scoring systems but these are far from ideal and individual risk. The currend trend to personalised medicine requires finding the most useful thrombotic risk biomarker in these patients. Routine tests for coagulation do not take account of both pro- and anti-coagulant factors which is why these tests are not useful in patients with Philadelphia-negative myeloproliferative neoplasms...
January 6, 2017: Biomedical Papers of the Medical Faculty of the University Palacký, Olomouc, Czechoslovakia
https://www.readbyqxmd.com/read/28145076/low-agreement-between-fresh-and-frozen-thawed-platelet-rich-plasma-in-the-calibrated-automated-thrombogram-assay
#18
M Ljungkvist, S Lövdahl, E Zetterberg, E Berntorp
INTRODUCTION: Thrombin generation tests (TGTs) are considered to give more detailed information of the overall coagulation capability of a patient than clotting-based routine assays. The TGT thrombin generation assay-calibrated automated thrombogram (TGA-CAT) uses both platelet-poor plasma (PPP) and platelet-rich plasma (PRP). Assessing PRP gives more physiological test conditions and is of great interest considering the important role platelets play in haemostasis. However, PRP needs to be assessed close after blood draw/preparation as freezing fragments the platelets...
January 31, 2017: Haemophilia: the Official Journal of the World Federation of Hemophilia
https://www.readbyqxmd.com/read/28142075/platelet-tissue-factor-activity-and-membrane-cholesterol-are-increased-in-hypercholesterolemia-and-normalized-by-rosuvastatin-but-not-by-atorvastatin
#19
Olga Panes, César González, Patricia Hidalgo, Juan P Valderas, Mónica Acevedo, Susana Contreras, Ximena Sánchez, Jaime Pereira, Attilio Rigotti, Diego Mezzano
BACKGROUND AND AIMS: High plasma LDL-cholesterol (LDL-C) and platelet responses have major pathogenic roles in atherothrombosis. Thus, statins and anti-platelet drugs constitute mainstays in cardiovascular prevention/treatment. However, the role of platelet tissue factor-dependent procoagulant activity (TF-PCA) has remained unexplored in hypercholesterolemia. We aimed to study platelet TF-PCA and its relationship with membrane cholesterol in vitro and in 45 hypercholesterolemic patients (HC-patients) (LDL-C >3...
December 16, 2016: Atherosclerosis
https://www.readbyqxmd.com/read/28138665/a-sub-picomolar-assay-for-protein-by-using-cubic-cu2o-nanocages-loaded-with-au-nanoparticles-as-robust-redox-probes-and-efficient-non-enzymatic-electrocatalysts
#20
Jianmin Zhao, Ting Zheng, Jiaxi Gao, Shijing Guo, Xingxing Zhou, Wenju Xu
In this work, a simple and sensitive electrochemical aptasensor for protein (thrombin - TB used as the model) was developed by using cubic Cu2O nanocages (Cu2O-NCs) loaded with Au nanoparticles (AuNPs@Cu2O-NCs) as non-enzymatic electrocatalysts and robust redox probes. Through the specific sandwich-type reaction between TB and TB aptamers (TBA), the formed AuNPs@Cu2O-NCs bound with NH2-TBA were captured onto the electrode surface modified with SH-TBA. Based on the inherent redox activity of AuNPs@Cu2O-NCs with cubic nanostructures, a detectable electrochemical signal was generated which was dependent on the analyte concentration...
January 31, 2017: Analyst
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