Abstract:
INTRODUCTION:Unfractionated heparin (UFH) potentiates platelet aggregation induced by some agonists. P2Y12 and P2Y1 receptors play a major role in amplifying platelet aggregation. We assessed the ability of cangrelor, a selective P2Y12 antagonist, A2P5P, a selective P2Y1 antagonist, and aspirin to block the potentiating effects of heparin. MATERIALS AND METHODS:Whole blood from healthy human volunteers was anticoagulated with either hirudin or UFH 10 IU/ml. Some tubes anticoagulated with hirudin also contained UFH 1 or 10 IU/ml. The low-molecular-weight heparin dalteparin was also assessed. Platelet aggregation was performed using whole blood single-platelet counting. Dense granule release was assessed using 14C-5HT-labelled platelets. RESULTS:UFH and, to a lesser extent, dalteparin potentiated platelet aggregation induced by ADP, PAF, 5HT, U46619, epinephrine and TRAP in a concentration-dependent manner but inhibited aggregation induced by collagen. Cangrelor effectively opposed the potentiating effects of heparins on sustained aggregation induced by ADP, PAF, 5HT, U46619 and TRAP but had less effect on epinephrine-induced aggregation, whereas A2P5P was more effective at blocking both the initial phase of ADP-induced aggregation and the aggregation response to epinephrine, reflecting the differences in G protein coupling between the agonist receptors. Aspirin had no effect on potentiation by heparin. Heparins did not increase ADP- or TRAP-induced 14C-5HT release. CONCLUSIONS:Heparins potentiate platelet responses to ADP and numerous other agonists. This potentiation is attenuated by cangrelor and A2P5P, and is not mediated by increased dense granule release. ADP receptor antagonists but not aspirin may have potential therapeutic benefits in counteracting the pro-thrombotic effects of heparins.
journal_name
Thromb Resjournal_title
Thrombosis researchauthors
Storey RF,May JA,Heptinstall Sdoi
10.1016/j.thromres.2004.09.004subject
Has Abstractpub_date
2005-01-01 00:00:00pages
301-7issue
4eissn
0049-3848issn
1879-2472pii
S0049-3848(04)00495-5journal_volume
115pub_type
杂志文章abstract:AIM:Postprandial platelet activation was related to postprandial insulin rather than glucose levels in a previous meal insulin study in type 2 diabetes mellitus (T2DM). We therefore compared postprandial platelet activation in type 1 (T1DM) patients without insulin secretion and T2DM patients with high postprandial ins...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/j.thromres.2016.03.009
更新日期:2016-05-01 00:00:00
abstract:BACKGROUND:Ultrasound has the potential to augment chemical thrombolysis. METHODS AND RESULTS:Thrombotic occlusions in the left circumflex artery (LCx) were induced in 27 dogs. Sixty minutes later, tissue-type plasminogen activator (t-PA) was given intravenously over 90 min. Thrombotic occlusions (n = 20) were treated...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/s0049-3848(03)00335-9
更新日期:2003-05-01 00:00:00
abstract:BACKGROUND:The fibrinogen γ' variant (γ') has both antithrombotic and prothrombotic properties when compared to normal fibrinogen. It may therefore be of relevance in intracerebral hemorrhage and intraventricular extension of the bleeding. OBJECTIVE:To study the role of γ' in intracerebral hemorrhage, and in intravent...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/j.thromres.2011.08.017
更新日期:2012-06-01 00:00:00
abstract::Three methods commonly used for isolation of blood platelets from plasma were compared. Platelets were isolated by: 1) a washing method; 2) a method of metrizamide-gradient centrifugation; 3) a modified method of gel-filtration. The last method employed BSA-Sepharose gel instead of routinely used Sepharose gel saturat...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/s0049-3848(00)00282-6
更新日期:2000-09-01 00:00:00
abstract:INTRODUCTION:Bleeding after cardiac surgery may be caused by surgical factors, impaired haemostasis, or a combination of both. Transfusion of blood products is used to improve haemostasis, but little is known about what combination is optimal. We hypothesized that addition of both fibrinogen and platelets to blood samp...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/j.thromres.2014.05.023
更新日期:2014-10-01 00:00:00
abstract::Mass-Length ratio of fibrin fibres (microT and microP) derived independently from turbidity and permeability respectively, in networks made in fibrinogen solution and plasma, have been compared under similar conditions of clotting. Amount of fibrinogen conversion to fibrin was similar in both systems when high thrombi...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/0049-3848(87)90193-9
更新日期:1987-02-01 00:00:00
abstract::The interaction of platelets with collagen involves short aminoacid sequences which recur along the fibres. Platelet aggregation by collagen and serotonin release is inhibited by a synthetic octapeptide LYS-PRO-GLY-GLU- PRO-GLY-PRO-LYS- derived from type III collagen. In contrast, this octapeptide inhibits only weakly...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/0049-3848(83)90061-0
更新日期:1983-12-15 00:00:00
abstract::The levels of protein C (PC) and other coagulation factors were monitored during endotoxin-induced disseminated intravascular coagulation (DIC) in the dog. Initial evaluation of the effectiveness of intradermal administration of bolus endotoxin quantities into the dog, demonstrated induction of DIC in the canine, with...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/0049-3848(89)90062-5
更新日期:1989-08-01 00:00:00
abstract::In 51 shock patients with DIC Antithrombin III (AT III) substitution, heparin or a combination of both substances respectively was administered. In the two groups which had been given AT III substitution the concentration of AT III rose considerably higher than the activity. There was a drop of the platelet count in b...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/0049-3848(85)90123-9
更新日期:1985-07-01 00:00:00
abstract:INTRODUCTION:To validate the diagnostic criteria for disseminated intravascular coagulation (DIC) established by the Japanese Association for Acute Medicine (JAAM) at an early stage of trauma and to evaluate the hypothesis that the JAAM criteria can diagnose DIC with a higher sensitivity than the International Society ...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/j.thromres.2009.06.036
更新日期:2009-12-01 00:00:00
abstract:INTRODUCTION:After major liver surgery, there are risks of both postoperative bleeding and thrombosis. Routine coagulation monitoring is indicated, but may not provide adequate clinical guidance. Thus, we described the clotting status in a pilot study using broader coagulation testing. We analysed the temporal pattern ...
journal_title:Thrombosis research
pub_type: 临床试验,杂志文章
doi:10.1016/j.thromres.2015.05.023
更新日期:2015-08-01 00:00:00
abstract::The effects of desmopressin and dextran on haemostasis and fibrinolysis were studied in four healthy volunteers. Both drugs were compared to placebo, each volunteer being subject to four experiments. Dextran 70 (30 g i.v.) moderately decreased VIII:C and vWF:Ag and slightly increased antithrombin III, also when haemod...
journal_title:Thrombosis research
pub_type: 临床试验,杂志文章
doi:10.1016/0049-3848(91)90009-l
更新日期:1991-06-01 00:00:00
abstract::Cell lysates of the human monoblastic leukemia cell line, THP-1, have procoagulant activity (PCA) that is Ca++-dependent and not demonstrable in either Factor VII-, or Factor X-deficient plasma. The PCA of THP-1 cells was enhanced by human recombinant tumor necrosis factor-alpha (TNF-alpha) up to five fold. There was ...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/0049-3848(89)90162-x
更新日期:1989-10-15 00:00:00
abstract::We characterized the antithrombotic, haemorrhagic, and ex vivo anticoagulant effects of a recently identified depolymerized holothurian glycosaminoglycan (DHG), and compared these effects with those of unfractionated heparin (UFH), low molecular weight heparin (LMWH), and dermatan sulfate (DS). In thrombin-induced ven...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/0049-3848(96)00166-1
更新日期:1996-10-15 00:00:00
abstract::The three polypeptide chains of fibrinogen, A alpha, B beta and gamma chain, are synthesized on separate polysomes. Fully formed fibrinogen is a six chain, disulfide-linked, dimeric molecule with a molecular weight of 340kDa. Previous pulse-chase studies with L-35 S methionine using the human hepatocellular carcinoma ...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/0049-3848(87)90290-8
更新日期:1987-04-15 00:00:00
abstract::The specific thromboxane A2/prostaglandin H2 (TXA2/PGH2) antagonist 13-azaprostanoic acid (13-APA) reverses platelet aggregation stimulated by TXA2/PGH2 and the prostaglandin endoperoxide analog U46619. The present report demonstrates that the deaggregatory properties of 13-APA are potentiated by prostacyclin (PGI2). ...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/0049-3848(82)90097-4
更新日期:1982-12-15 00:00:00
abstract:INTRODUCTION:Information regarding any possible additional effect of genetic variants other than CYP2C19*2 on platelet reactivity in patients undergoing percutaneous coronary intervention (PCI), while on dual antiplatelet therapy, is sparse. MATERIALS AND METHODS:Genotyping for CYP2C19*2, CYP2C19*17, CYP2C9*3, CYP2B6*...
journal_title:Thrombosis research
pub_type: 临床试验,杂志文章
doi:10.1016/j.thromres.2011.07.022
更新日期:2012-04-01 00:00:00
abstract::The heparin-derived oligosaccharide C3 (C3) is currently underdevelopment for the prevention and treatment of vascular dementia and senile dementia of Alzheimer's type. C3 exhibits a molecular weight of 2200-2500 Da with a narrow distribution. The objective of the present study was to assess the pharmacodynamics and p...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/j.thromres.2003.11.008
更新日期:2003-01-01 00:00:00
abstract:INTRODUCTION:In patients with new symptoms in a leg previously affected by deep vein thrombosis (DVT), the presence of thrombus on ultrasound cannot be assumed to be due to recurrent thrombosis. Several parameters have been suggested to differentiate between acute and chronic thrombus on ultrasound, including measureme...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/j.thromres.2005.02.011
更新日期:2006-01-01 00:00:00
abstract:INTRODUCTION:The safety and efficacy of low-molecular-weight heparin (LMWH) treatment in patients with cancer-associated thrombosis (CAT) beyond 6months are unknown. Our aim was to determine the safety of long-term tinzaparin use in patients with CAT. METHODS:We performed a prospective, open, single arm, multicentre s...
journal_title:Thrombosis research
pub_type: 杂志文章,多中心研究
doi:10.1016/j.thromres.2017.07.004
更新日期:2017-09-01 00:00:00
abstract:BACKGROUND:The treatment of venous thromboembolism (VTE) in cancer patients remains controversial. PURPOSE:The Italian Society for Thrombosis and Haemostasis (SISET) commissioned a project to develop clinical practice guidelines for the therapy of VTE in patients with malignancies. METHODS:Key questions about the tre...
journal_title:Thrombosis research
pub_type: 杂志文章,实务指引
doi:10.1016/j.thromres.2009.08.006
更新日期:2009-11-01 00:00:00
abstract:INTRODUCTION:Management of pregnant women at risk for venous thromboembolism (VTE) remains complex. Guidelines do not definitively fix optimal strategies due to limited trial data. Our objective was to build an easy-to-use tool allowing individualised, risk-adapted prophylaxis. MATERIALS AND METHODS:A Delphi exercise ...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/j.thromres.2010.01.012
更新日期:2010-08-01 00:00:00
abstract:INTRODUCTION:Plasminogen activator inhibitor (PAI-1) may have an independent prognostic value in breast cancer (BC). PAI-1 4G/5G polymorphism may have significance for antigen expression. Thus, we analyzed the possible associations between PAI-1 4G/5G polymorphism, plasma PAI-1 levels, and clinicopathological features ...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/j.thromres.2009.02.014
更新日期:2009-09-01 00:00:00
abstract:INTRODUCTION:Changes in platelet count and function contribute to thrombo-hemorrhagic episodes in chronic myeloproliferative syndromes (MPS). We used flow cytometry to study platelet-leukocyte conjugates and markers of platelet activation in patients with MPS. METHODS:Whole blood from patients with chronic myelogenous...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/s0049-3848(02)00354-7
更新日期:2002-11-01 00:00:00
abstract:INTRODUCTION:Global clotting assays may reflect an individual's net hemostatic balance and could contribute to prothrombotic and hemorrhagic risk assessment. In this research, a global assay that measures both coagulation and fibrinolytic capacities was developed and investigated. MATERIALS AND METHODS:In the Clot For...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/j.thromres.2004.12.009
更新日期:2005-01-01 00:00:00
abstract:INTRODUCTION:Tissue factor plays a key role in the extrinsic coagulation pathway and is induced by inflammatory cytokines. Atrial myocarditis has been detected recently in some patients with lone atrial fibrillation. Virchow's triad of low blood flow, hypercoagulability, and endothelial dysfunction, enhances thrombus f...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/s0049-3848(03)00405-5
更新日期:2003-01-01 00:00:00
abstract::The presence of one acidifying Cl-/HCO3- exchange mechanism in human platelets has not been previously reported. This paper demonstrates that this mechanism does function and that it increases its activity after stimulation with thrombin. On resuspension of BCECF-loaded platelets in a chloride-free medium (gluconate r...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/j.thromres.2004.11.012
更新日期:2005-01-01 00:00:00
abstract:INTRODUCTION:The contribution of platelet activation to the pathogenesis of sickle cell disease (SCD) remains uncertain. We evaluated the safety and efficacy of eptifibatide, a synthetic peptide inhibitor of the αIIbβ3 receptor, in SCD patients during acute painful episodes. MATERIALS AND METHODS:In this single site, ...
journal_title:Thrombosis research
pub_type: 杂志文章,随机对照试验
doi:10.1016/j.thromres.2013.08.002
更新日期:2013-09-01 00:00:00
abstract:INTRODUCTION:High concentrations of N-terminal-pro-brain natriuretic peptide (NT-proBNP) are found in patients with right ventricular overload. Right ventricular overload may be the result of large perfusion defects in patients with pulmonary embolism (PE). NT-proBNP levels are associated with poorer outcome in patient...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/j.thromres.2011.02.014
更新日期:2011-06-01 00:00:00
abstract::Clot lysis induced by streptokinase has been studied and the influences of pH and the concentrations of plasminogen, fibrinogen and buffer composition investigated. Variations in the concentrations of plasminogen strongly effect the SK apparent activity, maxima being obtained at different plasminogen concentrations li...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/0049-3848(91)90071-4
更新日期:1991-12-15 00:00:00