Abstract:
:Human and bovine alpha-thrombins (greater than 90% alpha form) with high fibrinogen clotting activities (approximately 3,000 U.S. units/mg protein) exhibit similar Michaelis menten kinetics with the p-nitroanilide tripeptide substrates Tos-Gly-Pro-arg-pNA (Chromozym-TH) and D-Phe-Pip-Arg-pNA (S-2238). The kinetic parameters at I = 0.11 M, 25 degrees C, pH 7.8 are: (Km = 4.18 +/- 0.22 and 3.61 +/- 0.15 microM; kcat = 127 +/- 8 and 100 +/- 1 s-1) for Chromozym TH and (Km = 1.33 +/- 0.07 and 1.50 +/- 0.10 microM; kcat = 91.4 +/- 1.8 and 98.0 +/- 0.5 s-1) for S-2238 for the human and bovine enzymes, respectively. Unlike the native enzyme forms, their "non-clotting" terminal degradative forms, human gamma-thrombin (approximately 5 units/mg) and bovine beta-thrombin (approximately 200 units/mg), give increased values for these parameters (km = 14.3 +/- 2.4 and 14.4 +/- 2.2 microM; kcat = 160 +/- 9 and 124 +/- 6 s-1) for Chromozym-TH; and (Km = 2.50 +/- 0.36 and 2.99 +/- 0.33 microM; kcat = 106 +/- 3 and 106 +/- 3 s-1) for S-2238. Based on these parameters, 50% degradation of human or bovine alpha-thrombins can be calculated to produce relatively small errors in the kinetic measurement of total thrombin concentrations (maximally 9% and 7% for Chromozym-TH; 7% and 3% for S-2238, respectively) if the kinetic parameters for all alpha forms are erroneously used and assays are at 150 microM substrate. This is in contrast to the large errors inherent in clotting activity measurements on thrombin mixtures. Incorporation of 1 mg/ml of polyethylene glycol 6,000 into assay solutions eliminates systematic errors otherwise caused by thrombin adsorption to surfaces and enables thrombin to be accurately assayed at concentrations less than 0.1 nM or 0.01 clotting unit/ml of alpha-thrombin.
journal_name
Thromb Resjournal_title
Thrombosis researchauthors
Lottenberg R,Hall JA,Fenton JW 2nd,Jackson CMdoi
10.1016/0049-3848(82)90114-1subject
Has Abstractpub_date
1982-11-01 00:00:00pages
313-32issue
3eissn
0049-3848issn
1879-2472pii
0049-3848(82)90114-1journal_volume
28pub_type
杂志文章abstract::There is now compelling evidence that use of oral contraceptives and postmenopausal hormonal therapies containing various estrogens is associated with a weak, but clinically relevant risk of both arterial and venous thrombosis. The increased risk is related to type and dose of both estrogen and combined progestagen an...
journal_title:Thrombosis research
pub_type: 杂志文章,评审
doi:10.1016/S0049-3848(13)70009-4
更新日期:2013-01-01 00:00:00
abstract:BACKGROUND:Non-vitamin K antagonist oral anticoagulants (NOACs) do not need routine laboratory monitoring but measurement of drug concentration is important in emergency conditions. Specific laboratory tests are not readily available or not implemented in every hospital. Point-of-Care Tests (POCT) may bridge this gap a...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/j.thromres.2018.01.044
更新日期:2018-03-01 00:00:00
abstract::Chloroquine inhibited aggregation of rat blood platelets in a dose-dependent way. The inhibitory effect decreased, depending on the aggregation stimulus used, in the rank order of potency: ADP > thrombin > A23187. Effect of 1 millimolar chloroquine on A23187-stimulated aggregation was significantly decreased or comple...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/0049-3848(94)90270-4
更新日期:1994-06-01 00:00:00
abstract::A quantitative assessment was made of the distribution of arachidonic acid (AA), eicosapentaenoic acid (EPA), docosapentaenoic acid (DPA), and docosahexaenoic acid (DHA) among the individual sub-classes (diacyl, alkylacyl, alkenylacyl) of the various platelet phospholipids of human subjects consuming a fish oil concen...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/0049-3848(88)90181-8
更新日期:1988-04-01 00:00:00
abstract::A new type of assay for heparins has been devised, in which the test material competes with 125I-labelled heparin for binding to protamine-Sepharose. The assay is very sensitive and will measure heparin concentrations down to 10 ng ml-1. It responds to both the degree of sulphation and the molecular weight of acidic p...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/0049-3848(82)90056-1
更新日期:1982-08-15 00:00:00
abstract:INTRODUCTION:In reconstructive head and neck cancer surgery, tissue flaps are transferred to the surgical defect and revascularized by anastomosis of small vessels. Cancer patients are in a hypercoagulable state with high risk of peri- and postoperative thrombotic events. Thrombosis to the tissue flap anastomoses or mi...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/S0049-3848(16)30195-5
更新日期:2016-04-01 00:00:00
abstract::The antithrombotic properties of acetyl salicylic acid (ASA) used at current doses are largely demonstrated. However, our previous study showed unexpected thrombotic potencies associated with the use of this drug. In this study we investigate the effect of aspirin on an experimental thrombosis induced by laser beams, ...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/s0049-3848(97)00302-2
更新日期:1998-02-01 00:00:00
abstract:INTRODUCTION:The prevalence and etiology of occult bleeding among patients on warfarin who are screened systematically for new anemia is largely unknown. We aimed to estimate the usefulness of following hemoglobin and mean red cell volume (MCV) with INR in order to screen for developing anemia as an indicator of occult...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/j.thromres.2012.05.005
更新日期:2012-09-01 00:00:00
abstract:BACKGROUND:Immune thrombocytopenia (ITP) is an immune-mediated bleeding disorder in children. Activated T cells have been shown to play important roles in ITP. The aims of this study were to evaluate whether these T cell activation markers could be used as indicators to differentiate ITP patients from controls, and to ...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/j.thromres.2019.05.010
更新日期:2019-08-01 00:00:00
abstract::The antithrombotic effect of a synthetic symmetrical triglyceride having eicosapentaenoic acid (EPA) at positions 1 and 3, and gamma-linolenic acid (GLA) at position 2 was investigated. Administration of the triglyceride significantly increased thrombus formation time and thrombotic occlusion time induced by light irr...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/0049-3848(95)99610-k
更新日期:1995-06-01 00:00:00
abstract::Postoperative chylothorax is a frequently encountered pathology occurring in up to 4% of patients undergoing surgery for repair of congenital heart disease. Symptomatic thrombosis is associated with chylothorax and may contribute to its severity and duration. Furthermore, vessel thrombosis resulting in persistent vess...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/j.thromres.2013.06.014
更新日期:2013-08-01 00:00:00
abstract:INTRODUCTION:Inter-individual variability in clopidogrel responsiveness is dependent on genetic polymorphisms. We aimed to investigate the impact of 3 genetic polymorphisms involved in clopidogrel metabolism on a strategy of dose-adjustment according to platelet reactivity (PR) monitoring. MATERIAL AND METHODS:[correc...
journal_title:Thrombosis research
pub_type: 临床试验,杂志文章,多中心研究
doi:10.1016/j.thromres.2011.12.038
更新日期:2012-07-01 00:00:00
abstract:INTRODUCTION:Though thrombin-activatable fibrinolysis inhibitor (TAFI) may contribute to hypercoagulability during pregnancy, limited data are available on the role of TAFI in women with recurrent fetal loss. MATERIAL/METHODS:We performed a case-control study aimed at evaluating any possible association between TAFI l...
journal_title:Thrombosis research
pub_type: 杂志文章,随机对照试验
doi:10.1016/j.thromres.2011.09.029
更新日期:2012-08-01 00:00:00
abstract:BACKGROUND:The purpose of this study was to determine whether the administration of multiple boluses of oral and intravenous tranexamic acid (TXA) postoperatively was equivalent in reducing blood loss in primary THA. METHODS:A total of 108 patients were randomized into two groups: oral TXA group (54 patients receiving...
journal_title:Thrombosis research
pub_type: 杂志文章,随机对照试验
doi:10.1016/j.thromres.2018.02.007
更新日期:2018-04-01 00:00:00
abstract:INTRODUCTION:Although accumulating evidence within the past 5 years strongly supports the importance of platelet P2X(1) receptors in hemostasis and thrombosis, P2X(1) receptors of platelet and/or its progenitor cell, megakaryocyte, have not been fully characterized. The aim of this study was to electrophysiologically a...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/j.thromres.2006.03.007
更新日期:2007-01-01 00:00:00
abstract:INTRODUCTION:Pre-eclampsia is an important cause of maternal morbidity and mortality. Its etiology is still unknown. Clinical symptoms correlate with activation of coagulation and inherited thrombophilia has been associated with pre-eclampsia. ABO blood group has been associated with thrombotic disorders and pre-eclamp...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/j.thromres.2008.11.012
更新日期:2009-06-01 00:00:00
abstract::To demonstrate that human alpha-thrombin is effectively inactivated by human antithrombin III (AT) during the production of a fibrin clot we measured the amount of alpha-thrombin activity which can be recovered from a clot generated from purified human proteins. We discovered that 0.05-0.07% of the original alpha-thro...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/0049-3848(93)90234-f
更新日期:1993-03-01 00:00:00
abstract::The extracellular nucleotides, ATP and ADP, as well as adenosine have been implicated in a great number of physiological functions. ADP is one of the major platelet recruiting factors, whereas ATP is considered to be a competitive inhibitor of ADP-induced platelet aggregation and adenosine is able to induce vasodilata...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/j.thromres.2007.01.006
更新日期:2007-01-01 00:00:00
abstract:INTRODUCTION:Early achievement of therapeutic INR leads to shorter hospital stay and lesser cost. Two warfarin initiation nomograms (10 mg nomogram and 5 mg nomogram) are widely used but it is not yet clear which one is better. They have been validated in the West but there are no studies from India. We undertook this ...
journal_title:Thrombosis research
pub_type: 临床试验,信件
doi:10.1016/j.thromres.2018.12.026
更新日期:2019-04-01 00:00:00
abstract::Defibrotide (D) was labelled with 125I or with 32P. The radiolabelled compounds ([125I]-Defibrotide ([125I]-D), [32P]-Defibrotide ([32P]-D) retained the same profibrinolytic activity, in vitro, as the parent drug, suggesting that the labelling procedures had not modified the pharmacological properties of D and hence t...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/0049-3848(95)00213-8
更新日期:1996-01-01 00:00:00
abstract::VKORC1 and VKORC1L1 are enzymes that both catalyze the reduction of vitamin K2,3-epoxide via vitamin K quinone to vitamin K hydroquinone. VKORC1 is the key enzyme of the classical vitamin K cycle by which vitamin K-dependent (VKD) proteins are γ-carboxylated by the hepatic γ-glutamyl carboxylase (GGCX). In contrast, t...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/j.thromres.2015.01.025
更新日期:2015-05-01 00:00:00
abstract::Experimental and clinical studies support the pivotal role played by reactive oxidant species in the mechanism of platelet activation. This effect is achieved via multiple pathways, including enhanced formation of isoprostanes. Platelet NADPH oxidase seems to be the main source of platelet reactive oxidant species and...
journal_title:Thrombosis research
pub_type: 杂志文章,评审
doi:10.1016/j.thromres.2011.12.002
更新日期:2012-03-01 00:00:00
abstract:INTRODUCTION:The activated partial thromboplastin time (APTT) is commonly used to monitor unfractionated heparin (UFH) but may not accurately measure the amount of heparin present. The anti-Xa assay is less susceptible to confounding factors and may be a better assay for this purpose. MATERIALS AND METHODS:The validit...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/j.thromres.2017.07.006
更新日期:2017-09-01 00:00:00
abstract::Venous thromboembolism (VTE), comprising deep vein thrombosis (DVT) and pulmonary embolism (PE), presents a large clinical burden. Prompt, effective and sustained anticoagulation is vital because of the risk of recurrent events, including life-threatening PE, and complications such as post-thrombotic syndrome and chro...
journal_title:Thrombosis research
pub_type: 杂志文章,评审
doi:10.1016/j.thromres.2014.05.013
更新日期:2014-08-01 00:00:00
abstract::Microheterogeneity of antithrombin III (ATIII) was examined in pooled normal human plasma and serum by IEF/PA and immunoblotting techniques. A pattern consisting of 8 bands varying in isoelectric point from 4.7 to 5.2 was observed in citrated plasma following IEF in a pH range of 4-6. A similar pattern was observed in...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/0049-3848(85)90331-7
更新日期:1985-10-15 00:00:00
abstract::There are some issues in the current factor (F)VIII replacement therapy for severe hemophilia A. One is mental and physical burden for the multiple intravenous infusions, and the other is difficulty in the hemostatic treatment for the patients with FVIII inhibitor. The development of novel drug with fully hemostatic e...
journal_title:Thrombosis research
pub_type: 杂志文章,评审
doi:10.1016/S0049-3848(16)30361-9
更新日期:2016-05-01 00:00:00
abstract:BACKGROUND:Ambient particulate matter (PM) is associated with cardiovascular morbidity and mortality. It has been proposed that PM induces a pro-thrombotic process, increasing the risk of cardiovascular events, with some support from epidemiological and laboratory-based models. Diesel exhaust is a major contributor to ...
journal_title:Thrombosis research
pub_type: 杂志文章,随机对照试验
doi:10.1016/j.thromres.2007.01.005
更新日期:2007-01-01 00:00:00
abstract:INTRODUCTION:There is some controversy regarding the effect of CYP2C19 polymorphism on clinical outcome in patients with dual antiplatelet therapy. Chronic kidney disease (CKD) is associated with increased risk of cardiovascular event, but the association between the possession of CYP2C19 loss-of-function (LOF) alleles...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/j.thromres.2014.07.039
更新日期:2014-11-01 00:00:00
abstract::Isolated rat liver macrophages (Kupffer cells) produce a factor(s) which stimulates fibrinogen synthesis 5-8 fold in hepatocyte cultures. The production of the stimulatory factor reached maximum during the first 24 hours the cells were in culture. When the cell culture medium was chromatographed on a calibrated Sephad...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/0049-3848(83)90025-7
更新日期:1983-10-15 00:00:00
abstract:BACKGROUND/AIMS:The plasminogen activator (PA)-plasmin system is primarily involved in fibrinolysis, but is also in the patho/physiological events in which breakdown of extracellular matrices is evoked topically. In this present study, we examined the expression of fibrinolytic factors, tissue-type PA (t-PA) and Type 1...
journal_title:Thrombosis research
pub_type: 杂志文章
doi:10.1016/s0049-3848(01)00370-x
更新日期:2001-11-15 00:00:00