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Functional clotting assay

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https://www.readbyqxmd.com/read/28219843/the-impact-of-the-endothelial-protein-c-receptor-on-thrombin-generation-and-clot-lysis
#1
Laura Pepler, Chengliang Wu, Dhruva J Dwivedi, Cynthia Wu, Paul Y Kim, Patricia C Liaw
INTRODUCTION: When thrombin is bound to thrombomodulin (TM), it becomes a potent activator of protein C (PC) and thrombin-activable fibrinolysis inhibitor (TAFI). Activation of PC is enhanced when PC is bound to the endothelial protein C receptor (EPCR). Activated protein C (APC) inhibits thrombin generation while activated TAFI (TAFIa) attenuates fibrinolysis. To determine the impact of diminished EPCR function on thrombin generation and fibrinolysis we generated cells that expressed TM and a variant of EPCR (R96C) that does not bind PC...
February 3, 2017: Thrombosis Research
https://www.readbyqxmd.com/read/28196451/phenotypic-and-genetic-analysis-of-dysprothrombinemia-due-to-a-novel-homozygous-mutation
#2
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/28158230/the-effects-of-residual-platelets-in-plasma-on-plasminogen-activator-inhibitor-1-and-plasminogen-activator-inhibitor-1-related-assays
#3
Marlien Pieters, Sunelle A Barnard, Du Toit Loots, Dingeman C Rijken
Due to controversial evidence in the literature pertaining to the activity of plasminogen activator inhibitor-1 in platelets, we examined the effects of residual platelets present in plasma (a potential pre-analytical variable) on various plasminogen activator inhibitor-1 and plasminogen activator inhibitor-1-related assays. Blood samples were collected from 151 individuals and centrifuged at 352 and 1500 g to obtain plasma with varying numbers of platelet. In a follow-up study, blood samples were collected from an additional 23 individuals, from whom platelet-poor (2000 g), platelet-containing (352 g) and platelet-rich plasma (200 g) were prepared and analysed as fresh-frozen and after five defrost-refreeze cycles (to determine the contribution of in vitro platelet degradation)...
2017: PloS One
https://www.readbyqxmd.com/read/28109042/expression-and-characterization-of-a-codon-optimized-blood-coagulation-factor-viii
#4
S A Shestopal, J-J Hao, E Karnaukhova, Y Liang, M V Ovanesov, M Lin, J H Kurasawa, T K Lee, J H McVey, A G Sarafanov
BACKGROUND: Production of recombinant factor VIII (FVIII) is challenging due to its low expression. It was previously shown that codon-optimization of a B domain-deleted FVIII (BDD-FVIII) cDNA resulted in increased protein expression. However, it is well-recognized that synonymous mutations may affect the protein structure and function. OBJECTIVES: To compare biochemical properties of a BDD-FVIII expressed from codon-optimized (CO) and the wild-type (WT) cDNAs. METHODS: Each variant of the BDD-FVIII was expressed in several independent CHO cell lines, generated using a lentiviral platform...
January 21, 2017: Journal of Thrombosis and Haemostasis: JTH
https://www.readbyqxmd.com/read/28102731/microfluidic-whole-blood-testing-of-platelet-response-to-pharmacological-agents
#5
Ruizhi Li, Tilo Grosser, Scott L Diamond
Platelets present a number of intracellular and transmembrane targets subject to pharmacological modulation, either for cardiovascular disease reduction or as an unintended drug response. Microfluidic devices allow human blood to clot on a defined surface under controlled hemodynamic and pharmacological conditions. The potencies of a number of antiplatelet and anticancer drugs have been tested with respect to platelet deposition on collagen under flow. Inhibitors of cyclooxygenase-1 (COX-1) reduce platelet deposition, either when added ex vivo to blood or ingested orally by patients prior to testing...
January 19, 2017: Platelets
https://www.readbyqxmd.com/read/28091958/identification-and-anticoagulant-activity-of-a-novel-kunitz-type-protein-ha11-from-the-salivary-gland-of-the-tick-hyalomma-asiaticum
#6
Houshuang Zhang, Ruiqiong Qiao, Haiyan Gong, Jie Cao, Yongzhi Zhou, Jinlin Zhou
Kunitz/bovine pancreatic trypsin inhibitor proteins are abundant in the salivary glands of ticks and perform multiple functions in blood feeding, including inhibiting blood coagulation, regulating host blood supply and disrupting host angiogenesis. In this study, we identified a novel gene designated HA11 (Hyalomma asiaticum 11 kDa protein) from the salivary gland of the tick H. asiaticum. HA11 is encoded by a gene with an open reading frame of 306 bp that is translated into a deduced 101 amino acid 11 kDa protein that shares 27% sequence identity with a Kunitz-like protease inhibitor precursor in Amblyomma variegatum...
January 2017: Experimental & Applied Acarology
https://www.readbyqxmd.com/read/28089408/the-various-assays-for-measuring-activity-states-of-factor-viia-in-plasma-and-therapeutic-products-diagnostic-value-and-analytical-usefulness-in-various-pathophysiological-states
#7
REVIEW
Jean Amiral, Claire Dunois, Cédric Amiral, Jerard Seghatchian
The key coagulation factor FVII, and its activated form FVIIa, present a major interest for their role at the initiation phase of blood coagulation, and because they can activate all blood coagulation cascade, through the extrinsic, but also the intrinsic pathway. Blood activation initiated through FVII is first presented, as it is understood nowadays. Measurement of FVII and FVIIa were of main interest for epidemiological studies, but FVIIa contribution to assay results was only deduced. The introduction of specific FVIIa assays, functional or immunoassays, allowed measuring directly FVIIa without any interference of non-activated FVII, or other coagulation factors or their activated forms...
December 29, 2016: Transfusion and Apheresis Science
https://www.readbyqxmd.com/read/28050371/haemostatic-profile-in-patients-of-myeloproliferative-neoplasms-a-tertiary-care-centre-experience
#8
Yatendra Parashar, Rashmi Kushwaha, Ashutosh Kumar, Kamal Agarwal, U S Singh, Mili Jain, S P Verma, A K Tripathi
INTRODUCTION: Patients of MPN commonly present with abnormalities in laboratory coagulation tests that are consistent with hypercoagulable state. Some individuals with MPN exhibit a pattern of exclusive bleeding or thrombotic events; many others have both bleeding and thrombosis during the course of the disease. AIM: This study was undertaken to assess the haemostatic defects and platelet functions in patients of MPN. MATERIALS AND METHODS: One year prospective study was conducted at a tertiary care centre in North India in Department of Pathology in collaboration with Department of Clinical Haematology...
November 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28029716/inactivation-of-human-coagulation-factor-x-by-a-protease-of-the-pathogen-capnocytophaga-canimorsus
#9
K Hack, F Renzi, E Hess, F Lauber, J Douxfils, J M Dogné, G R Cornelis
BACKGROUND: Capnocytophaga canimorsus is a Gram-negative bacterium, which belongs to the oral flora of dogs and causes fulminant sepsis in humans who have been bitten, licked or scratched. In patients, bleeding abnormalities, such as petechiae, purpura fulminans or disseminated intravascular coagulation (DIC) occur frequently. OBJECTIVE: We investigated whether C. canimorsus could actively contribute to these bleeding abnormalities. METHODS: Calibrated automated thrombogram and clotting time assays were performed to assess the anticoagulant activity of C...
December 28, 2016: Journal of Thrombosis and Haemostasis: JTH
https://www.readbyqxmd.com/read/28028882/simultaneous-lactic-acidification-and-coagulation-by-using-recombinant-lactococcus-lactis-strain
#10
Mohammad Raftari, Sobhan Ghafourian, Fatimah Abu Bakar
AIMS: This study was an attempt to create a novel milk clotting procedure using recombinant bacterium capable of milk coagulation. METHODS AND RESULTS: The Rhizomucor pusillus proteinase (RPP) gene was sub-cloned into pALF expression vector. The recombinant pALF-RPP vector was then electro-transferred into L. lactis. Finally, milk coagulation ability of recombinant L. lactis carrying RPP gene was evaluated. Nucleotide sequencing of DNA insertion from the clone revealed that the RPP activity corresponded to an open reading frame consisting of 1218 bp coding for a 43...
December 28, 2016: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/28028118/rapid-evaluation-of-platelet-function-with-t2-magnetic-resonance
#11
Adam Cuker, Holleh Husseinzadeh, Tatiana Lebedeva, Joseph E Marturano, Walter Massefski, Thomas J Lowery, Michele P Lambert, Charles S Abrams, John W Weisel, Douglas B Cines
OBJECTIVES: The clinical diagnosis of qualitative platelet disorders (QPDs) based on light transmission aggregometry (LTA) requires significant blood volume, time, and expertise, all of which can be barriers to utilization in some populations and settings. Our objective was to develop a more rapid assay of platelet function by measuring platelet-mediated clot contraction in small volumes (35 µL) of whole blood using T2 magnetic resonance (T2MR). METHODS: We established normal ranges for platelet-mediated clot contraction using T2MR, used these ranges to study patients with known platelet dysfunction, and then evaluated agreement between T2MR and LTA with arachidonic acid, adenosine diphosphate, epinephrine, and thrombin receptor activator peptide...
December 2016: American Journal of Clinical Pathology
https://www.readbyqxmd.com/read/28007010/genetic-analysis-of-a-hereditary-factor-xii-deficiency-pedigree-of-a-consanguineous-marriage-due-to-a-homozygous-f12-gene-mutation-gly341arg
#12
Xiaoli Cheng, Lihong Yang, Guoyong Huang, Yanhui Jin, Xiuping Hao, Mingshan Wang
OBJECTIVE AND IMPORTANCE: To study the gene mutations of factor XII (FXII) in a Chinese family of consanguineous marriage with FXII deficiency and illuminate the possible molecular pathogenic mechanism. It will contribute to our comprehension of the pathogenesis of the disease. CLINICAL PRESENTATION: The proband was a 26-year-old Chinese pregnant woman who was discovered, in a pregnancy test, with a prolonged activated partial thromboplastin time (APTT) at 61.6s (reference range, 29...
December 22, 2016: Hematology (Amsterdam, Netherlands)
https://www.readbyqxmd.com/read/27983747/laboratory-and-clinical-monitoring-of-direct-acting-oral-anticoagulants-what-clinicians-need-to-know
#13
Susan E Conway, Andrew Y Hwang, Charles D Ponte, John G Gums
The direct acting oral anticoagulants (DOACs), including dabigatran, rivaroxaban, apixaban, and edoxaban, have favorable pharmacokinetic and pharmacodynamic properties and equal or superior efficacy and an improved safety profile compared with warfarin. Noted shortcomings with DOACs are shorter half-lives requiring stricter adherence, lack of standardized laboratory monitoring, lack of anticoagulation reversal agents, and loss of routine coagulation monitoring leading to fewer patient-clinician interactions...
December 16, 2016: Pharmacotherapy
https://www.readbyqxmd.com/read/27941590/traumatic-hemothorax-blood-contains-elevated-levels-of-microparticles-that-are-prothrombotic-but-inhibit-platelet-aggregation
#14
Thomas A Mitchell, Maryanne C Herzig, Chriselda G Fedyk, Marc A Salhanick, Aaron T Henderson, Bijaya K Parida, Nicolas J Prat, Daniel L Dent, Martin G Schwacha, Andrew P Cap
OBJECTIVES: Autotransfusion of shed blood from traumatic hemothorax is an attractive option for resuscitation of trauma patients in austere environments. However, previous analyses revealed that shed hemothorax (HX) blood is defibrinated, thrombocytopenic, and contains elevated levels of D-dimer. Mixing studies with normal pooled plasma demonstrated hypercoagulability, evoking concern for potentiation of acute traumatic coagulopathy. We hypothesized that induction of coagulopathic changes by shed HX blood may be due to increases in cellular microparticles (MP) and that these may also affect recipient platelet function...
December 9, 2016: Shock
https://www.readbyqxmd.com/read/27939487/cerebrospinal-fluid-levels-of-tau-and-phospho-tau-181-proteins-during-pregnancy
#15
Wolfgang Lederer, Cristina Alomar Dominguez, Marina Popovscaia, Günther Putz, Christian Humpel
OBJECTIVES: During pregnancy various interactions occur between structural alterations of the maternal brain and placental metabolism. The aim of the present study was to investigate whether cerebrospinal fluid concentrations of tau and phospho-tau-181 protein vary during normal pregnancy and in women with preeclampsia and HELLP syndrome. STUDY DESIGN: We measured cerebrospinal fluid biomarkers, tau and phospho-tau-181 protein levels in 90 pregnant women electively assigned for regional anaesthesia during pregnancy or for cesarean section using enzyme-linked immunosorbent assays...
October 2016: Pregnancy Hypertension
https://www.readbyqxmd.com/read/27926787/comparison-of-the-effects-of-a-balanced-crystalloid-based-and-a-saline-based-tetrastarch-solution-on-canine-whole-blood-coagulation-and-platelet-function
#16
Annina Reuteler, Shannon Axiak-Flammer, Judith Howard, Katja-Nicole Adamik
OBJECTIVE: To evaluate the effects of a 6% hydroxyethyl starch (130/0.42) solution in either a buffered, electrolyte-balanced (HES-BAL), or a saline (HES-SAL) carrier solution on canine platelet function and whole blood coagulation. DESIGN: Prospective, randomized study. SETTING: University teaching hospital. ANIMALS: Thirty-seven client-owned dogs undergoing general anesthesia for arthroscopy or imaging studies. INTERVENTIONS: Dogs received a 15 mL/kg intravenous bolus of HES-SAL (n = 13), HES-BAL (n = 14), or a modified Ringer's solution (n = 10) over 30-40 minutes...
January 2017: Journal of Veterinary Emergency and Critical Care
https://www.readbyqxmd.com/read/27918018/a-planar-model-of-the-vessel-wall-from-cellularized-collagen-scaffolds-focus-on-cell-matrix-interactions-in-mono-bi-and-tri-culture-models
#17
Caroline Loy, Sébastien Meghezi, Lucie Lévesque, Daniele Pezzoli, Heena Kumra, Dieter Reinhardt, Jayachandran N Kizhakkedathu, Diego Mantovani
The acquisition of new thorough knowledge on the interactions existing between vascular cells would represent a step forward in the engineering of vascular tissues. In this light, herein we designed a physiological-like tri-culture in vitro vascular wall model using a planar cellularized collagen gel as the scaffold. The model can be obtained in 24 h and features multi-layered hierarchical organization composed of a fibroblast-containing adventitia-like layer, a media-like layer populated by smooth muscle cells and an intima-like endothelial cell monolayer...
December 20, 2016: Biomaterials Science
https://www.readbyqxmd.com/read/27917409/gadolinium-functionalized-peptide-amphiphile-micelles-for-multimodal-imaging-of-atherosclerotic-lesions
#18
Sang Pil Yoo, Federico Pineda, John C Barrett, Christopher Poon, Matthew Tirrell, Eun Ji Chung
The leading causes of morbidity and mortality globally are cardiovascular diseases, and nanomedicine can provide many improvements including disease-specific targeting, early detection, and local delivery of diagnostic agents. To this end, we designed fibrin-binding, peptide amphiphile micelles (PAMs), achieved by incorporating the targeting peptide cysteine-arginine-glutamic acid-lysine-alanine (CREKA), with two types of amphiphilic molecules containing the gadoliniuim (Gd) chelator diethylenetriaminepentaacetic acid (DTPA), DTPA-bis(stearylamide)(Gd), and 1,2-distearoyl-sn-glycero-3-phosphoethanolamine-N-[(poly(ethylene glycol) (PEG))-2000]-DTPA(Gd) (DSPE-PEG2000-DTPA(Gd))...
November 30, 2016: ACS Omega
https://www.readbyqxmd.com/read/27901294/performance-of-functional-fibrinogen-thromboelastography-in-children-undergoing-congenital-heart-surgery
#19
Nischal K Gautam, Chunyan Cai, Olga Pawelek, Muhammad B Rafique, Davide Cattano, Evan G Pivalizza
BACKGROUND: Functional Fibrinogen assay of the Thromboelastography (FFTEG), a whole blood viscoelastic hemostatic assay, has been used to estimate fibrinogen levels in adult patients undergoing major surgery but its performance in pediatric patients undergoing cardiac surgery requires evaluation. In this study, we evaluate the correlation between FFTEG parameters and standard laboratory tests for fibrinogen and platelet counts before and after cardiopulmonary bypass in children undergoing repair for congenital heart disease...
February 2017: Paediatric Anaesthesia
https://www.readbyqxmd.com/read/27892731/is-arachidonic-acid-stimulation-really-a-test-for-the-response-to-aspirin-time-to-think-again
#20
REVIEW
Bartosz Olechowski, Alexander Ashby, Mark Mariathas, Vikram Khanna, Michael Mahmoudi, Nick Curzen
Platelets play a key role in pathogenesis of atherothrombosis. Activated platelets initiate thrombus formation. Antiplatelet therapy (APT) modifies these properties. APT involves aspirin. The existence of 'aspirin resistance' is reported in many populations with cardiovascular disease. The prevalence of this phenomenon is highly variable, affecting more than 50% of patient subgroups in some papers. Areas covered: This review describes the prevalence of 'aspirin resistance', analyses why there is so much apparent variation and addresses whether the commonly used tests of aspirin response are in fact accurately assessing its functional performance...
January 2017: Expert Review of Cardiovascular Therapy
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