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https://www.readbyqxmd.com/read/28549218/exosite-2-directed-ligands-attenuate-protein-c-activation-by-the-thrombin-thrombomodulin-complex
#1
Kai Chen, Alan R Stafford, Chengliang Wu, Calvin Yeh, Paul Y Kim, James C Fredenburgh, Jeffrey I Weitz
Thrombin activity, inhibition, and localization are regulated by two exosites that flank the active site. Substrates, cofactors and inhibitors bind to exosite 1 to promote active site access, whereas exosite 2 interactions retain thrombin on cells, platelets, and proteins. The exosites also serve allosteric roles, whereby ligand binding alters thrombin activity. Previously, we showed that ligands that bind exosite 2 attenuate the exosite 1-mediated interaction of thrombin with fibrin, demonstrating allosteric connection between the exosites...
May 26, 2017: Biochemistry
https://www.readbyqxmd.com/read/28548671/controllable-n-fe2o3-graphene-nanomaterials-by-ald-applied-in-an-aptasensor-with-enhanced-electrochemical-performance-for-thrombin-detection
#2
Hongfen Zhang, Baiyan Zhang, Anjia Chen, Yong Qin
An elegant atomic layer deposition (ALD) method has been employed for the controllable preparation of a uniform Fe2O3-coated graphene nanostructure (Fe2O3@graphene). The Fe2O3 coating thickness of the Fe2O3@graphene nanostructure can be tuned by varying the cycle number of Fe2O3 ALD. The produced Fe2O3@graphene composites are characterized by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy and cyclic voltammetry (CV). It is revealed that Fe2O3 is effectively deposited on the surface of graphene...
May 26, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28539062/two-new-flavonoids-from-artemisia-argyi-with-their-anticoagulation-activities
#3
Jie-Li Lv, Zhen-Zhen Li, Lai-Bin Zhang
A new flavone glycoside, eupatilin 7-O-β-d-glucopyranoside (1) and a new flavone, 5,6,2',4'-tetrahydroxy-7,5'-dimethoxyflavone (2), were isolated from Artemisia argyi. Their structures were unambiguously elucidated by extensive spectroscopic analysis. Both flavonoids were evaluated for in vitro anticoagulation activities. Compound 1 significantly extended thrombin time. Compound 2 had obvious effect in increasing prothrombin time.
May 25, 2017: Natural Product Research
https://www.readbyqxmd.com/read/28537975/reduced-requirement-for-prothrombin-complex-concentrate-for-the-restoration-of-thrombin-generation-in-plasma-from-liver-transplant-recipients
#4
Ezeldeen Abuelkasem, Shaheer Hasan, Michael A Mazzeffi, Raymond M Planinsic, Tetsuro Sakai, Kenichi A Tanaka
BACKGROUND: Plasma transfusion remains the mainstay hemostatic therapy during liver transplantation (LT) in most countries. However, a large volume is required for plasma to achieve clinically relevant factor increases. Prothrombin complex concentrate (PCC) is a low-volume alternative to plasma in warfarin reversal, but its efficacy has not been well studied in LT. METHODS: Blood samples were collected from 28 LT patients at baseline (T0) and 30 minutes after graft reperfusion (T1)...
May 19, 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/28537563/anastomotic-leaks-in-gastrointestinal-surgery-and-their-prevention
#5
Tomasz Banasiewicz, Adam Dziki, Paweł Lampe, Zbigniew Lorenc, Marek Szczepkowski, Jacek Zieliński, Grzegorz Wallner
Anastomotic leak in the gastrointestinal tract is one of the most important complications of resection. They are the main cause of reoperation, their occurrence worsens the prognosis of the patient, increasing the proportion of direct mortality, as well as being a significant risk factor for recurrence of cancer. The risk of leaks within the gastrointestinal tract is greatly varied, depending on the location and extent of the resection, but also on patient, disease or a surgical procedure, including surgeon...
April 30, 2017: Polski Przeglad Chirurgiczny
https://www.readbyqxmd.com/read/28528289/platelet-hyperactivation-apoptosis-and-hypercoagulability-in-patients-with-acute-pulmonary-embolism
#6
Samin Rezania, Michael A Puskarich, Daniela N Petrusca, Evandro M Neto-Neves, Matthew T Rondina, Jeffrey A Kline
Changes in systemic redox balance can alter platelet activation and aggregation. Acute pulmonary embolism (PE) is a systematic inflammatory disease associated with mechanical shear stress, increased thrombin, catecholamines, serotonin and hemolysis, which cumulatively can hyperactivate platelets and accelerate their turnover. We tested the hypothesis that platelets from patients with moderately severe PE will show hyperstimulation and a pre-apoptotic phenotype associated with microparticles (MPs) in plasma...
May 13, 2017: Thrombosis Research
https://www.readbyqxmd.com/read/28527240/recurrent-deep-vein-thrombosis-after-the-first-venous-thromboembolism-event-a-single-institution-experience
#7
Mohammad Asim, Hassan Al-Thani, Ayman El-Menyar
BACKGROUND We investigated the frequency, clinical presentation, risk factors, and outcome after the first deep vein thrombosis (DVT) event. MATERIAL AND METHODS A retrospective study was conducted for patients with DVT between 2008 and 2012 with a 1-year follow-up. Patients were divided into 2 groups: single vs. recurrent DVT (RDVT). RESULTS Of the 6420 patients screened for DVT, 662 (10.3%) had DVT. RDVT constituted 22% of cases. A single event was more frequent in left lower limb DVT (p=0.01), while RDVT cases had more bilateral DVT (p=0...
May 20, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28527185/surface-heparinization-and-blood-compatibility-modification-of-small-intestinal-submucosa-sis-for-small-caliber-vascular-regeneration
#8
Bensong Han, Feng Xue, Cunyi Fan, Xiumei Mo
OBJECTIVES: This study aims to investigate the small intestinal submucosal (SIS) surface after heparinization with the hypothermia plasma technique, to improve the blood compatibility of SIS, and to explore the possibility of construction of small-caliber vascular grafts with modified SIS scaffolds in vivo. METHODS: SIS films prepared from jejunums of pigs were processed for surface treatment at different time periods with the argon plasma initiation technique under vacuum, and were then immediately immersed in 4% (m/v) heparin sodium solution for 24-h heparinization...
2017: Bio-medical Materials and Engineering
https://www.readbyqxmd.com/read/28526142/anticoagulant-reversal-and-anesthetic-considerations
#9
REVIEW
Joseph Meltzer, Joseph R Guenzer
Bleeding complications are a common concern with the use of anticoagulant agents. In many situations, reversing of neutralizing their effects may be warranted. Prothrombin complex concentrate replaces coagulation factors lowered by warfarin, as does fresh frozen plasma, but in a more concentrated form. Protamine negates the effect of heparin and combines chemically with heparin molecules to form an inactive salt. It also partially reverses the effects of low-molecular-weight heparin. Recombinant activated factor VII is a nonspecific procoagulant that activates the extrinsic clotting pathway, resulting in thrombin generation, but does not directly neutralize the activity of any of the new oral anticoagulants...
June 2017: Anesthesiology Clinics
https://www.readbyqxmd.com/read/28525975/venous-thromboembolism-in-hospitalized-patients-receiving-chemotherapy-for-malignancies-at-japanese-community-hospital-prospective-observational-study
#10
Hiromitsu Kitayama, Tomohiro Kondo, Junko Sugiyama, Kazutomo Kurimoto, Yasuhiro Nishino, Michiaki Hirayama, Yasushi Tsuji
BACKGROUND: Although Asian population was recognized to have a lower risk of venous thromboembolism (VTE), its increasing prevalence and incidence remain unclear in patients with malignancies. We attempted to predict VTE development using activation markers of coagulation and fibrinolysis. METHODS: We enrolled patients with malignancy admitted to Tonan Hospital between April and December 2014 to receive a new-for-them chemotherapy regimen. All patients were examined for VTE by computed tomography and whole-leg compression ultrasonography before chemotherapy and three months later...
May 19, 2017: BMC Cancer
https://www.readbyqxmd.com/read/28525532/the-effects-of-indirect-and-direct-acting-anticoagulants-on-lupus-anticoagulant-assays-a-large-retrospective-study-at-a-coagulation-reference-laboratory
#11
Jansen N Seheult, Michael P Meyer, Franklin A Bontempo, Irina Chibisov
Objectives: To investigate the effects of indirect- and direct-acting anticoagulants on the interpretation of lupus anticoagulant (LAC) assays. Methods: A retrospective database review was performed to identify all LAC panels from November 2012 to November 2015. The positivity rates for three LAC tests were compared among various anticoagulant medications. Results: This analysis included 7,721 LAC panels. Direct oral anticoagulants, warfarin, and unfractionated heparin (UFH) were associated with higher LAC positivity rates compared with patients not receiving documented anticoagulation (83% for argatroban, 58% for dabigatran, 72% for rivaroxaban, 53% for apixaban, 56% for warfarin, and 36% for UFH vs 29% for no anticoagulation, P < ...
May 19, 2017: American Journal of Clinical Pathology
https://www.readbyqxmd.com/read/28523947/potentiation-of-trap-6-induced-platelet-dense-granule-release-by-blockade-of-p2y12-signaling-with-mrs2395
#12
Annachiara Mitrugno, Rachel A Rigg, Nicole B Laschober, Anh T P Ngo, Jiaqing Pang, Craig D Williams, Joseph E Aslan, Owen J T McCarty
The release of ADP from platelet dense granules and its binding to platelet P2Y12 receptors is key to amplifying the initial hemostatic response and propagating thrombus formation. P2Y12 has thus emerged as a therapeutic target to safely and effectively prevent secondary thrombotic events in patients with acute coronary syndrome or a history of myocardial infarction. Pharmacological inhibition of P2Y12 receptors represents a useful approach to better understand the signaling mediated by these receptors and to elucidate the role of these receptors in a multitude of platelet hemostatic and thrombotic responses...
May 19, 2017: Platelets
https://www.readbyqxmd.com/read/28522812/selection-and-characterization-of-a-dna-aptamer-inhibiting-coagulation-factor-xia
#13
David A Donkor, Varsha Bhakta, Louise J Eltringham-Smith, Alan R Stafford, Jeffrey I Weitz, William P Sheffield
Factor XIa (FXIa) is a serine protease that catalyzes the activation of Factor IX (FIX) in the blood coagulation cascade. FXIa and its precursor FXI are emergent therapeutic targets for the development of safer anticoagulant agents. Here, we sought a novel DNA-based agent to inhibit FXIa. Towards this goal, an 80 base, single-stranded DNA aptamer library (containing a 40 base randomized core) was screened for FXIa-binding candidates, using ten rounds of positive and negative selection. After selection, 6 of 89 different sequences inhibited FXIa-mediated chromogenic substrate S2366 cleavage...
May 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28521572/tissue-factor-activity-in-women-with-preeclampsia-or-sga-a-potential-explanation-for-the-excessive-thrombin-generation-in-these-syndromes
#14
Offer Erez, Roberto Romero, Edi Vaisbuch, Nandor Gabor Than, Juan Pedro Kusanovic, Shali Mazaki-Tovi, Francesca Gotsch, Pooja Mittal, Zhong Dong, Tinnakorn Chaiworapongsa, Chong Jai Kim, Chia-Ling Nhan-Chang, Sun Kwon Kim, Lami Yeo, Moshe Mazor, Sonia S Hassan
OBJECTIVE: The aim of this study was to determine whether the activity of tissue factor (TF) and tissue factor pathway inhibitor (TFPI) in the plasma of women with preeclampsia (PE) and small for gestational age (SGA) neonate differ from that of normal pregnant women and whether they are related to specific placental lesions. METHODS: This cross-sectional study included the following groups: (1) normal pregnancy (n = 68); (2) PE (n= 128); and (3) SGA (n = 56)...
May 19, 2017: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/28520812/the-effect-of-platelet-rich-plasma-on-osseous-healing-in-dogs-undergoing-high-tibial-osteotomy
#15
Samuel P Franklin, Emily E Burke, Shannon P Holmes
OBJECTIVES: The purpose of this study was to investigate whether platelet-rich plasma (PRP) enhances osseous healing in conjunction with a high tibial osteotomy in dogs. STUDY DESIGN: Randomized controlled trial. METHODS: Sixty-four client-owned pet dogs with naturally occurring rupture of the anterior cruciate ligament and that were to be treated with a high tibial osteotomy (tibial plateau leveling osteotomy) were randomized into the treatment or control group...
2017: PloS One
https://www.readbyqxmd.com/read/28520400/femtomole-scale-high-throughput-screening-of-protein-ligands-with-droplet-based-thermal-shift-assay
#16
Wen-Wen Liu, Ying Zhu, Qun Fang
There is a great demand to measure protein-ligand interactions in rapid and low cost way. Here we developed a microfluidic droplet-based thermal shift assay (dTSA) system for high throughput screening of small-molecule protein ligands. The system is composed of a nanoliter droplet array chip, a microfluidic droplet robot, and a real-time fluorescence detection system. Total 324 assays could be performed in parallel in a single chip with an 18 × 18 droplet array. The consumption of dTSA for each protein or ligand sample was only 5 nL (femtomole scale), which is significantly reduced by over 3 orders of magnitude compared with those in 96 or 384-well plate-based systems...
May 18, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28512053/effect-of-chitosan-and-coagulation-factors-on-the-wound-repair-phenotype-of-bioengineered-blood-clots
#17
Caroline D Hoemann, Catherine Marchand, Georges-Etienne Rivard, Hani El-Gabalawy, Patrice E Poubelle
Controlling the blood clot phenotype in a surgically prepared wound is an evolving concept in scaffold-guided tissue engineering. Here, we investigated the effect of added chitosan (80% or 95% Degree of Deacetylation, DDA) or coagulation factors (recombinant human Factor VIIa, Tissue Factor, thrombin) on inflammatory factors released by blood clots. We tested the hypothesis that 80% DDA chitosan specifically enhances leukotriene B4 (LTB4) production. Human or rabbit whole blood was combined with isotonic chitosan solutions, coagulation factors, or lipopolysaccharide, cultured in vitro at 37°C, and after 4hours the serum was assayed for LTB4 or inflammatory factors...
May 13, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28511553/whole-blood-platelet-aggregation-test-and-prediction-of-hemostatic-difficulty-after-tooth-extraction-in-patients-receiving-antiplatelet-therapy
#18
Yasushi Nagao, Rikuo Masuda, Akane Ando, Mutsumi Nonaka, Akiko Nishimura, Kinuko Goto, Yasubumi Maruoka, Takehiko Iijima
When patients on antiplatelet therapy (APT) require minor invasive surgery, APT is usually continued to limit the risk of thrombosis. However, the possibility of hemostatic difficulties necessitates the monitoring of platelet aggregation to prevent unexpected bleeding. We examined whether whole blood aggregometry as a point-of-care testing (POCT) could be useful as a tool for predicting hemostatic difficulties. Sixty-five patients receiving APT and 15 patients who were not receiving APT were enrolled in the present study; all patients were scheduled to undergo a tooth extraction...
January 1, 2017: Clinical and Applied Thrombosis/hemostasis
https://www.readbyqxmd.com/read/28509761/dabigatran-in-nonvalvular-atrial-fibrillation-from-clinical-trials-to-real-life-experience
#19
Nicola Mumoli, Daniela Mastroiacovo, Eleonora Tamborini-Permunian, Josè Vitale, Matteo Giorgi-Pierfranceschi, Marco Cei, Francesco Dentali
: Atrial fibrillation is the most common arrhythmia in over-midlife patients. In addition to systolic heart failure, cerebral thromboembolism represents the most dramatic complication of this rhythm disorder, contributing to morbidity and mortality. Traditionally, anticoagulation has been considered the main strategy in preventing stroke and systemic embolism in atrial fibrillation patients and vitamin K-dependent antagonists have been widely used in clinical practice. Recently, the development of direct oral anticoagulants has certainly improved the management of this disease, providing, for the first time, the opportunity to go beyond vitamin K-dependent antagonists limits...
July 2017: Journal of Cardiovascular Medicine
https://www.readbyqxmd.com/read/28509344/cgmp-signalling-inhibits-platelet-shape-change-through-regulation-of-the-rhoa-rho-kinase-mlc-phosphatase-signalling-pathway
#20
Ahmed Aburima, Kochar Walladbegi, Jonathan D Wake, Khalid M Naseem
BACKGROUND: Platelet shape change, spreading and thrombus stability requires activation of the actin cytoskeleton contractile machinery. The mechanisms controlling actin assembly to prevent unwanted platelet activation are unclear. OBJECTIVES: We examined the effects of nitric oxide on the signalling pathways regulating platelet actin-myosin activation. RESULTS: S-nitrosoglutathione (GSNO) inhibited thrombin-induced platelet shape change and myosin phosphorylation of myosin light chain (MLC)...
May 16, 2017: Journal of Thrombosis and Haemostasis: JTH
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