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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
#1
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/28070807/successful-synthesis-of-active-human-coagulation-factor-vii-by-co-expression-of-mammalian-gamma-glutamyl-carboxylase-and-modification-of-vit-k-cycle-in-drosophila-schneider-s2-cells
#2
Kotomi Nagahashi, Kazuo Umemura, Naohiro Kanayama, Takayuki Iwaki
Mammalian gamma-glutamyl carboxylase and reduced vitamin K are indispensable for synthesis of mature mammalian vitamin K dependent proteins including some of blood coagulation factors (factors II, VII, IX, and X). It was well known that Drosophila melanogaster expressed gamma-glutamyl carboxylase and possessed a vit.K cycle although native substrates for them have not been identified yet. Despite the potential capability of gamma carboxylation in D. melanogaster derived cells such as S2 cells, Drosophila gamma-glutamyl carboxylase failed to gamma carboxylate a peptide fused to the human coagulation factor IX propeptide...
January 9, 2017: Cytotechnology
https://www.readbyqxmd.com/read/28055147/monitoring-of-treatment-with-vitamin-k-antagonists-recombinant-thromboplastins-are-more-sensitive-to-factor-vii-than-tissue-extract-thromboplastins
#3
Joseph S Biedermann, Antonius M H P van den Besselaar, Moniek P M de Maat, Frank W G Leebeek, Marieke J H A Kruip
BACKGROUND: Differences regarding sensitivity to factor VII (FVII) have been suggested for recombinant human and tissue-extract thromboplastins used for International Normalized Ratio (INR) measurement, but evidence is scarce. Differences in FVII sensitivity are clinically relevant since they can affect INR stability during treatment with vitamin K antagonists (VKA). OBJECTIVES: To determine if commercial thromboplastins react differently to changes in FVII. METHODS: We studied the effect of addition of FVII on the INR in plasma using three tissue-extract (Neoplastin C1+, Hepato Quick, Thromborel S) and three recombinant human (Recombiplastin 2G, Innovin, Coaguchek XS) thromboplastins...
January 5, 2017: Journal of Thrombosis and Haemostasis: JTH
https://www.readbyqxmd.com/read/28049362/warfarin-dose-model-for-the-prediction-of-stable-maintenance-dose-in-indian-patients
#4
Tejasvita Gaikwad, Kanjaksha Ghosh, Peter Avery, Farhad Kamali, Shrimati Shetty
The main aim of this study was to screen various genetic and nongenetic factors that are known to alter warfarin response and to generate a model to predict stable warfarin maintenance dose for Indian patients. The study comprised of 300 warfarin-treated patients. Followed by extensive literature review, 10 single-nucleotide polymorphisms, that is, VKORC1-1639 G>A (rs9923231), CYP2C9*2 (rs1799853), CYP2C9*3 (rs1057910), FVII R353Q (rs6046), GGCX 12970 C>G (rs11676382), CALU c.*4A>G (rs1043550), EPHX1 c...
January 1, 2017: Clinical and Applied Thrombosis/hemostasis
https://www.readbyqxmd.com/read/28038846/primary-prophylaxis-for-children-with-severe-congenital-factor-vii-deficiency-clinical-and-laboratory-assessment
#5
A A Kuperman, A A Barg, Y Fruchtman, E Shaoul, N Rosenberg, G Kenet, T Livnat
Severe congenital factor VII (FVII) deficiency is a rare bleeding disorder. Prophylaxis with replacement therapy has been suggested to patients, yet the most beneficial dosing regimens and therapy intervals are still to be defined. Due to the lack of evidence-based data, we hereby present our experience with long-term administration and monitoring primary prophylaxis in children with severe FVII deficiency and an extremely high bleeding risk. Four children with familial FVII deficiency, treated by prophylactic recombinant activated factor VII (rFVIIa), 15-30μg/kg/dose, given 2-3 times weekly since infancy, are discussed...
December 19, 2016: Blood Cells, Molecules & Diseases
https://www.readbyqxmd.com/read/28034354/recombinant-activated-factor-vii-eptacog-alfa-activated-novoseven-%C3%A2-in-patients-with-rare-congenital-bleeding-disorders-a-systematic-review-on-its-use-in-surgical-procedures
#6
Matteo Nicola Dario Di Minno, Pasquale Ambrosino, Veronika A Myasoedova, Manuela Amato, Itala Ventre, Elena Tremoli, Alessandro Di Minno
In the absence of definite guidelines in the area, we have carried a systemic review to provide a thorough overview concerning the efficacy and safety of recombinant activated factor VII (rFVIIa, NovoSeven®, Novo Nordisk A/S, Bagsværd, Denmark) in patients with Glanzmann's thrombasthenia (GT) and FVII deficiency, undergoing surgical procedures. PubMed, Web of Science, Scopus and EMBASE databases was employed for the search. Three multicenter registries were identified: the Glanzmann's Thrombasthenia Registry (GTR), the Seven Treatment Evaluation Registry (STER), and a German post-marketing surveillance registry (the WIRK study)...
December 30, 2016: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/28003931/stability-of-thawed-apheresis-fresh-frozen-plasma-stored-for-up-to-120-hours-at-1%C3%A2-c-to-6%C3%A2-c
#7
William P Sheffield, Varsha Bhakta, Qi-Long Yi, Craig Jenkins
Regulations concerning the storage of transfusable plasma differ internationally. In Canada, plasma obtained from whole blood donations and frozen within 24 hours of phlebotomy (frozen plasma, FP) may be thawed and transfused within 120 hours of refrigerated storage. However, plasma frozen within 8 hours of phlebotomy following apheresis donation (FFPA) must be transfused within 24 hours of thawing and refrigeration. Our objectives were to measure coagulation factors (F) V, VII, and VIII, fibrinogen activities, and the prothrombin time (PT) in thawed refrigerated FFPA at 0, 24, and 120 hours of storage and to compare these values to those in thawed refrigerated FP...
2016: Journal of Blood Transfusion
https://www.readbyqxmd.com/read/27921096/poly-glycoamidoamine-brush-nanomaterials-for-systemic-sirna-delivery-in-vivo
#8
X Luo, W Wang, J R Dorkin, O Veiseh, P H Chang, I Abutbul-Ionita, D Danino, R Langer, D G Anderson, Y Dong
Delivery is the key challenge for siRNA based therapeutics. Here, we report the development of new poly(glycoamidoamine) brush nanomaterials for efficient siRNA delivery. GluN4C10 polymer brush nanoparticles, a lead material, demonstrated significantly improved delivery efficiency for siRNA against factor VII (FVII) in mice compared to poly(glycoamidoamine) brush nanomaterials reported previously.
December 20, 2016: Biomaterials Science
https://www.readbyqxmd.com/read/27913544/treatment-of-rare-factor-deficiencies-in-2016
#9
Flora Peyvandi, Marzia Menegatti
Rare bleeding disorders (RBDs) are a heterogeneous group of coagulation disorders characterized by fibrinogen, prothrombin, factors V, VII, X, XI, or XIII (FV, FVII, FX, FXI, or FXIII, respectively), and the combined factor V + VIII and vitamin K-dependent proteins deficiencies, representing roughly 5% of all bleeding disorders. They are usually transmitted as autosomal, recessive disorders, and the prevalence of the severe forms could range from 1 case in 500 000 for FVII up to 1 in 2-3 million for FXIII in the general population...
December 2, 2016: Hematology—the Education Program of the American Society of Hematology
https://www.readbyqxmd.com/read/27903969/targeting-tissue-factor-as-a-novel-therapeutic-oncotarget-for-eradication-of-cancer-stem-cells-isolated-from-tumor-cell-lines-tumor-xenografts-and-patients-of-breast-lung-and-ovarian-cancer
#10
Zhiwei Hu, Jie Xu, Jijun Cheng, Elizabeth McMichael, Lianbo Yu, William E Carson
Targeting cancer stem cell (CSC) represents a promising therapeutic approach as it can potentially fight cancer at its root. The challenge is to identify a surface therapeutic oncotarget on CSC. Tissue factor (TF) is known as a common yet specific surface target for cancer cells and tumor neovasculature in several solid cancers. However, it is unknown if TF is expressed by CSCs. Here we demonstrate that TF is constitutively expressed on CD133 positive (CD133+) or CD24-CD44+ CSCs isolated from human cancer cell lines, tumor xenografts from mice and breast tumor tissues from patients...
26, 2016: Oncotarget
https://www.readbyqxmd.com/read/27899993/predictive-value-of-microparticle-associated-tissue-factor-activity-for-permeability-glycoprotein-mediated-multidrug-resistance-in-cancer
#11
Antonio Angelini, Sebastiano Miscia, Maria Antonietta Centurione, Roberta Di Pietro, Lucia Centurione
Multidrug resistance (MDR) protein 1, which is also known as permeability glycoprotein (Pgp), and tissue factor (TF) are recurrently overexpressed on the surface of cancer cells, likely in response to stimuli such as chemotherapy. Microparticles (MPs) released from cancer cells into the bloodstream express tumour markers on their surface that may be useful as predictive biomarkers for evaluating disease progression. The present study measured the level of TF/factor VII (FVII)-dependent coagulation of MPs isolated from the plasma of cancer patients with various tumours, who were undergoing chemotherapy...
November 2016: Oncology Letters
https://www.readbyqxmd.com/read/27882572/a-paired-comparison-of-thawed-and-liquid-plasma
#12
Lucy Backholer, Laura Green, Sian Huish, Sean Platton, Michael Wiltshire, Heidi Doughty, Elinor Curnow, Rebecca Cardigan
BACKGROUND: To make plasma readily available to treat major hemorrhage, some centers are internationally using either thawed plasma (TP) or "never-frozen" liquid plasma (LP). Despite the routine use of both, there are limited data comparing the two. The hemostatic properties of LP were evaluated and compared to TP in a paired study. STUDY DESIGN AND METHODS: Two ABO-matched plasma units were pooled and split to produce 1 unit for LP and 1 unit for TP. Samples of TP and LP, stored at 2 to 6°C, were tested for a range of coagulation factors, thrombin generation, and rotational thromboelastometry...
November 23, 2016: Transfusion
https://www.readbyqxmd.com/read/27864149/mechanistic-insight-into-the-procoagulant-activity-of-tumor-derived-apoptotic-vesicles
#13
Morad-Rémy Muhsin-Sharafaldine, Bailey R Kennedy, Sarah C Saunderson, Catrin R Buchanan, Amy C Dunn, James M Faed, Alexander D McLellan
BACKGROUND: Chemotherapy induces the release of apoptotic vesicles (ApoV) from the tumor plasma membrane. Tumor ApoV may enhance the risk of thrombotic events in cancer patients undergoing chemotherapy. However, the relative contribution of ApoV to coagulation and the pathways involved remain poorly characterized. In addition, this study sets out to compare the procoagulant activity of chemotherapy-induced ApoV with their cell of origin and to determine the mechanisms of ApoV-induced coagulation...
February 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/27829580/inhibitory-effect-of-ethinylestradiol-on-coagulation-factors-in-rats
#14
Yanira Franco-Murillo, Ruth Jaimez
Epidemiological and experimental data have indicated the beneficial and adverse effects of estrogenic replacement therapy. In the present study, we explored the effect of ethinylestradiol (EE) and 17β-estradiol (E2) on screening tests, prothrombin time (PT) and activated partial thromboplastin time (APTT), as well as the activity of coagulation factors (FVII, FX, FXI, and FXII) in male Wistar rats. Animals were injected subcutaneously during three consecutive days with EE or E2 (1, 3, 10, and 30 mg/kg) and propylene glycol (0...
November 9, 2016: Experimental Animals
https://www.readbyqxmd.com/read/27824210/vkcfd2-from-clinical-phenotype-to-molecular-mechanism
#15
K J Czogalla, M Watzka, J Oldenburg
Vitamin K 2,3-epoxide reductase complex, subunit 1 (VKORC1) is an enzyme essential for the vitamin K cycle. VKORC1 catalyses the reduction of vitamin K 2,3-epoxide to the quinone form of vitamin K and further to vitamin K hydroquinone. The generated vitamin K hydroquinone serves as substrate for the enzyme γ-glutamyl-carboxylase which modifies all vitamin K-dependent proteins, allowing them to bind calcium ions necessary for physiological activity. Vitamin K-dependent proteins include the coagulation factors FII, FVII, FIX, FX, and proteins C, S und Z...
November 8, 2016: Hämostaseologie
https://www.readbyqxmd.com/read/27807692/tissue-factor-is-an-angiogenic-specific-receptor-for-factor-vii-targeted-immunotherapy-and-photodynamic-therapy
#16
Zhiwei Hu, Jijun Cheng, Jie Xu, Wolfram Ruf, Charles J Lockwood
Identification of target molecules specific for angiogenic vascular endothelial cells (VEC), the inner layer of pathological neovasculature, is critical for discovery and development of neovascular-targeting therapy for angiogenesis-dependent human diseases, notably cancer, macular degeneration and endometriosis, in which vascular endothelial growth factor (VEGF) plays a central pathophysiological role. Using VEGF-stimulated vascular endothelial cells (VECs) isolated from microvessels, venous and arterial blood vessels as in vitro angiogenic models and unstimulated VECs as a quiescent VEC model, we examined the expression of tissue factor (TF), a membrane-bound receptor on the angiogenic VEC models compared with quiescent VEC controls...
November 2, 2016: Angiogenesis
https://www.readbyqxmd.com/read/27799968/evaluation-of-aryoseven-safety-recombinant-activated-factor-vii-in-patients-with-bleeding-disorders-an-observational-post-marketing-surveillance-study
#17
Gholamreza Toogeh, Hassan Abolghasemi, Peyman Eshghi, Mohammadreza Managhchi, Mohammadreza Shaverdi-Niasari, Katayoon Karimi, Samin Roostaei, Neda Emran, Alireza Abdollahi
BACKGROUND: Recombinant activated factor VII induces hemostasis in patients with coagulopathy disorders. AryoSeven™ as a safe Iranian Recombinant activated factor VII has been available on our market. This study was performed to establish the safety of AryoSeven on patients with coagulopathy disorder. METHODS: This single-center, descriptive, cross sectional study was carried out in Thrombus and Homeostasis Research Center ValiAsr Hospital during 2013-2014. Fifty one patients with bleeding disorders who received at least one dose of Aryoseven were enrolled...
2016: Iranian Journal of Pathology
https://www.readbyqxmd.com/read/27777753/coagulative-safety-of-epidural-catheters-after-major-upper-gastrointestinal-surgery-advanced-and-routine-coagulation-analysis-in-38-patients
#18
Owain Thomas, Hampus Rein, Karin Strandberg, Ulf Schött
BACKGROUND: The risk of spinal haematoma in patients receiving epidural catheters is estimated using routine coagulation tests, but guidelines are inconsistent in their recommendations on what to do when results indicate slight hypocoagulation. Postoperative patients are prone to thrombosis, and thromboelastometry has previously shown hypercoagulation in this setting. We aimed to better understand perioperative haemostasis by comparing results from routine and advanced tests, hypothesizing that patients undergoing major upper gastrointestinal surgery would be deficient in vitamin K-dependent coagulation factors because of malnutrition, or hypocoagulative because of accumulation of low molecular weight heparin (LMWH)...
2016: Perioperative Medicine
https://www.readbyqxmd.com/read/27776919/ischemic-stroke-in-a-patient-with-moderate-to-severe-inherited-factor-vii-deficiency
#19
Manasa Reddy, Bernard Tawfik, Chakri Gavva, Sean Yates, Nicole De Simone, Sandra L Hofmann, Siayareh Rambally, Ravi Sarode
Thrombosis is known to occur in patients with rare inherited bleeding disorders, usually in the presence of a thrombotic risk factor such as surgery and/or factor replacement therapy, but sometimes spontaneously. We present the case of a 72-year-old African American male diagnosed with congenital factor VII (FVII) deficiency after presenting with ischemic stroke, presumably embolic, in the setting of atherosclerotic carotid artery stenosis. The patient had an international normalized ratio (INR) of 2.0 at presentation, with FVII activity of 6% and normal Extem clotting time in rotational thromboelastometry...
December 2016: Transfusion and Apheresis Science
https://www.readbyqxmd.com/read/27774726/during-warfarin-induction-the-fiix-prothrombin-time-reflects-the-anticoagulation-level-better-than-the-standard-prothrombin-time
#20
P I Jonsson, L Letertre, S J Juliusson, B R Gudmundsdottir, C W Francis, P T Onundarson
: Essentials Fiix-prothrombin time (PT) monitoring of warfarin measuring factor (F) II and X, is effective. Plasma obtained during warfarin induction and stable phase in Fiix-trial was assayed. Fiix-PT stabilized anticoagulation earlier than monitoring with traditional PT-INR. FVII had little effect on thrombin generation that was mainly determined by FII and FX. SUMMARY: Background The prothrombin time (PT) is equally prolonged by reduction of each of the vitamin K-dependent (VKD) factors (F) II, VII and X...
October 23, 2016: Journal of Thrombosis and Haemostasis: JTH
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