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stability fibrinogen concentrate

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https://www.readbyqxmd.com/read/28875196/preparation-and-antithrombotic-activity-identification-of-perinereis-aibuhitensis-extract-a-high-temperature-and-wide-ph-range-stable-biological-agent
#1
Yang Li, Jing Li, Tianhong Liu, Ying Wang, Zhongzheng Zhou, Feng Cheng, Chao Feng, Xiaojie Cheng, Hongjun Liu, Xiguang Chen
In this work, a thermal and wide pH range (from 1 to 13) stable biological agent was extracted from Perinereis aibuhitensis (P. aibuhitensis), and the antithrombotic activity of this P. aibuhitensis extract (PaE) was investigated. In vitro antithrombotic activity test indicated that PaE could significantly extend the clotting time of recalcified rabbit blood: the clotting time of the 10 mg mL(-1), 20 mg mL(-1) and 40 mg mL(-1) PaE groups increased by 24.24%, 68.64% and 130.76%, respectively. Further platelet poor plasma (PPP) coagulation study proved that PaE could obviously inhibit the intrinsic coagulation pathway and slightly inhibit the extrinsic coagulation pathway...
September 6, 2017: Food & Function
https://www.readbyqxmd.com/read/28801570/the-buckling-instability-of-aggregating-red-blood-cells
#2
Daniel Flormann, Othmane Aouane, Lars Kaestner, Christian Ruloff, Chaouqi Misbah, Thomas Podgorski, Christian Wagner
Plasma proteins such as fibrinogen induce the aggregation of red blood cells (RBC) into rouleaux, which are responsible for the pronounced shear thinning behavior of blood, control the erythrocyte sedimentation rate (ESR) - a common hematological test - and are involved in many situations of physiological relevance such as structuration of blood in the microcirculation or clot formation in pathological situations. Confocal microscopy is used to characterize the shape of RBCs within rouleaux at equilibrium as a function of macromolecular concentration, revealing the diversity of contact zone morphology...
August 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28772927/collagen-fibrinogen-lyophilised-scaffolds-for-soft-tissue-regeneration
#3
Jennifer Shepherd, Daniel Bax, Serena Best, Ruth Cameron
A significant body of research has considered collagen as a scaffold material for soft tissue regeneration. The main structural component of extra-cellular matrix (ECM), collagen's advantages over synthetic polymers are numerous. However, for applications where higher stiffness and stability are required, significant cross-linking may affect bioactivity. A carbodiimide (EDC) cross-linking route consumes carboxylate groups that are key to collagen's essential cell recognition motifs (GxOGER). Fibrinogen was considered as a promising additive as it plays a key role in the process of wound repair and contains RGD integrin binding sites which bind to a variety of cells, growth factors and cytokines...
May 23, 2017: Materials
https://www.readbyqxmd.com/read/28738008/randomized-placebo-controlled-study-of-the-effects-of-yunnan-baiyao-on-hemostasis-in-horses
#4
SallyAnne L Ness, Amelia H Frye, Thomas J Divers, Mark Rishniw, Hollis N Erb, Marjory B Brooks
OBJECTIVE To determine effects of oral administration of Yunnan Baiyao on platelet activation, coagulation, and fibrinolysis in healthy horses. ANIMALS 12 healthy adult horses. PROCEDURES In a randomized blinded crossover study that included a 4-week washout period between treatments, horses were orally administered a paste containing Yunnan Baiyao (15 mg/kg) or placebo at 12-hour intervals for 3 days. Blood samples were collected before start of treatment (time 0) and at 24 and 72 hours for a CBC, measurement of fibrinogen concentration, coagulation screening tests, and a panel of assays to assess platelet activation (including ADP- and collagen-induced aggregation and closure times, flow-cytometric variables of platelet-leukocyte aggregates, platelet membrane P-selectin and phosphatidylserine expression, and microparticle release), von Willebrand factor (vWF) concentration, and cofactor activity...
August 2017: American Journal of Veterinary Research
https://www.readbyqxmd.com/read/28651441/the-effect-of-ex-vivo-factor-xiii-supplementation-on-clot-formation-in-blood-samples-from-cardiac-and-scoliosis-surgery-patients
#5
Caroline Shams Hakimi, Malin S Carling, Emma C Hansson, Helena Brisby, Camilla Hesse, Vladimir Radulovic, Anders Jeppsson
Excessive perioperative bleeding remains a substantial problem. Factor XIII (FXIII) contributes to clot stability, and it has therefore been suggested that supplementation with FXIII concentrate may improve perioperative hemostasis. We evaluated the effects of increasing doses of FXIII, alone or in combination with fibrinogen or platelet concentrate, in blood samples from 2 considerably different groups of surgical patients: cardiac and scoliosis surgery patients. Whole-blood samples were collected immediately after operation from cardiac and scoliosis surgery patients...
January 1, 2017: Clinical and Applied Thrombosis/hemostasis
https://www.readbyqxmd.com/read/28445754/probing-the-dynamics-of-clot-bound-thrombin-at-venous-shear-rates
#6
Laura M Haynes, Thomas Orfeo, Kenneth G Mann, Stephen J Everse, Kathleen E Brummel-Ziedins
In closed system models of fibrin formation, exosite-mediated thrombin binding to fibrin contributes to clot stability and is resistant to inhibition by antithrombin/heparin while still susceptible to small, active-site inhibitors. Each molecule of fibrin can bind ∼1.6 thrombin molecules at low-affinity binding sites (Kd = 2.8 μM) and ∼0.3 molecules of thrombin at high-affinity binding sites (Kd = 0.15 μM). The goal of this study is to assess the stability of fibrin-bound thrombin under venous flow conditions and to determine both its accessibility and susceptibility to inhibition...
April 25, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28382370/impact-of-fibrinogen-carbamylation-on-fibrin-clot-formation-and-stability
#7
Veronika Binder, Brith Bergum, Stéphane Jaisson, Philippe Gillery, Carsten Scavenius, Endy Spriet, Anne Karin Nyhaug, Helen M Roberts, Iain L C Chapple, Annelie Hellvard, Nicolas Delaleu, Piotr Mydel
Carbamylation is a non-enzymatic post-translational modification induced upon exposure of free amino groups to urea-derived cyanate leading to irreversible changes of protein charge, structure and function. Levels of carbamylated proteins increase significantly in chronic kidney disease and carbamylated albumin is considered as an important biomarker indicating mortality risk. High plasma concentrations and long half-life make fibrinogen a prime target for carbamylation. As aggregation and cross-linking of fibrin monomers rely on lysine residues, it is likely that carbamylation impacts fibrinogen processing...
May 3, 2017: Thrombosis and Haemostasis
https://www.readbyqxmd.com/read/28132723/eb1-contributes-to-proper-front-to-back-polarity-in-neutrophil-like-hl-60-cells
#8
Matthias Samereier, Michael Schleicher, Heike Roth, Doris Brechtefeld, Barbara Walzog, Annette Müller-Taubenberger
Directed migration of leukocytes towards a chemotactic source is largely dependent on coordinated actin cytoskeleton functions that provide the driving forces at the cell front and enable contractility at the rear. In contrast to the force-generating properties of the actin cytoskeleton, the microtubule network assumes a regulatory function in balancing front-to-back polarity. In migrating neutrophils, microtubules are mostly concentrated at the cell rear, and previously published work suggested that microtubules are stabilized and kept in place by a mechanism involving Cdc42, WASP, CD11b, and the end-binding protein 1 (EB1)...
March 2017: European Journal of Cell Biology
https://www.readbyqxmd.com/read/28030952/calcium-stearate-as-an-effective-alternative-to-poly-vinyl-alcohol-in-poly-lactic-co-glycolic-acid-nanoparticles-synthesis
#9
Claudia Cella, Irini Gerges, Paolo Milani, Cristina Lenardi, Simona Argentiere
Poly(d,l-lactic-co-glycolic acid) (PLGA) nanoparticles (NPs) are among the most studied systems for drug and gene targeting. So far, the synthesis of stable and uniform PLGA NPs has involved the use of a large excess of polyvinyl surfactants such as poly(vinyl alcohol) (PVA) and polyvinylpyrrolidone (PVP), whose removal requires multistep purification procedures of high ecological and economic impact. Hence the development of environment-friendly and cost-effective synthetic procedures for the synthesis of PLGA NPs would effectively boost their use in clinics...
February 13, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/27942000/free-fatty-acids-modulate-thrombin-mediated-fibrin-generation-resulting-in-less-stable-clots
#10
Anna Tanka-Salamon, Erzsébet Komorowicz, László Szabó, Kiril Tenekedjiev, Krasimir Kolev
Upon platelet activation, free fatty acids are released at the stage of thrombus formation, but their effects on fibrin formation are largely unexplored. Our objective was to characterize the kinetic effects of fatty acids on thrombin activity, as well as the structural and mechanical properties of the resultant fibrin clots. Thrombin activity on fibrinogen was followed by turbidimetry and detailed kinetic characterization was performed using a fluorogenic short peptide substrate. The viscoelastic properties of fibrin were measured with rotatory oscillation rheometer, whereas its structure was analyzed with scanning electron microscopy (SEM)...
2016: PloS One
https://www.readbyqxmd.com/read/27506588/in-vitro-effects-of-different-sources-of-fibrinogen-supplementation-on-clot-initiation-and-stability-in-a-model-of-dilutional-coagulopathy
#11
N Schäfer, A Driessen, U Bauerfeind, M Fröhlich, J Ofir, E K Stürmer, M Maegele
OBJECTIVES: To analyse which fibrinogen source may improve coagulation using an in vitro 33% dilutional coagulopathy model. BACKGROUND: Uncritical volume resuscitation in the context of trauma haemorrhage contributes to the iatrogenic arm of the acute trauma-induced coagulopathy through dilution and depletion of coagulation factors, with fibrinogen reaching critical levels first. MATERIALS AND METHODS: By using an experimental model of 33% dilutional coagulopathy, we have analysed which fibrinogen source may exert superior effects on improving haemocoagulative capacities and correcting depleted fibrinogen levels...
October 2016: Transfusion Medicine
https://www.readbyqxmd.com/read/27192476/hemostatic-therapy-using-tranexamic-acid-and-coagulation-factor-concentrates-in-a-model-of-traumatic-liver-injury
#12
Christian Zentai, Paola E J van der Meijden, Till Braunschweig, Nicolai Hueck, Markus Honickel, Henri M H Spronk, Rolf Rossaint, Oliver Grottke
BACKGROUND: The potential clinical benefits of targeted therapy with coagulation factor concentrates (e.g., fibrinogen) and antifibrinolytic agents (e.g., tranexamic acid [TXA]) for the treatment of trauma-induced coagulopathy are increasingly recognized. We hypothesized that human fibrinogen concentrate (FC) and prothrombin complex concentrate (PCC), administered as combined therapy with TXA, would provide additive effects for reducing blood loss in an animal trauma model. METHODS: Thirty-six pigs were subjected to 2 consecutive blunt liver injuries, resulting in severe hemorrhagic shock and coagulopathy...
July 2016: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/26969525/significantly-reduced-adsorption-and-activation-of-blood-components-in-a-membrane-oxygenator-system-coated-with-crosslinkable-zwitterionic-copolymer
#13
Yan-Bing Wang, Ke-Hui Shi, Hong-Li Jiang, Yong-Kuan Gong
UNLABELLED: A crosslinkable zwitterionic copolymer PMBT was coated onto the surfaces of polypropylene hollow fiber membrane (PP-HFM) oxygenator and its connecting tubes. The PMBT copolymer coating on the oxygenator circuit formed a cell outer membrane mimetic surface with excellent stability. The hemocompatibility of the PMBT copolymer coated PP-HFM oxygenator circuit was evaluated by animal extracorporeal circulation. The concentrations of clotting components fibrinogen and platelet in the blood were almost unchanged during the circulation through the PMBT copolymer coated oxygenator circuits...
August 2016: Acta Biomaterialia
https://www.readbyqxmd.com/read/26840731/real-time-monitoring-of-platelet-activation-using-quartz-thickness-shear-mode-resonator-sensors
#14
Huiyan Wu, Guangyi Zhao, Hongfei Zu, James H-C Wang, Qing-Ming Wang
In this study, quartz thickness-shear mode (TSM) resonator sensors were adopted to monitor the process of platelet activation. Resting platelets adhering to fibrinogen-coated electrodes were activated by different concentrations of thrombin (1, 10, and 100 U/mL), and the corresponding electrical admittance spectra of TSM resonators during this process were recorded. Based on a bilayer-loading transmission line model of TSM resonators, the complex shear modulus (G' + jG″) and the average thickness (hPL) of the platelet monolayer at a series of time points were obtained...
February 2, 2016: Biophysical Journal
https://www.readbyqxmd.com/read/26689816/translation-of-cell-therapy-into-clinical-practice-validation-of-an-application-procedure-for-bone-marrow-progenitor-cells-and-platelet-rich-plasma
#15
REVIEW
Joerg Nowotny, Jana Farack, Corina Vater, Matthias Johnsen, Michael Gelinsky, Torsten Tonn, Philip Kasten
PURPOSE: Tissue regeneration can be improved by local application of autologous bone marrow derived progenitor cells (BMSC) and platelet rich plasma (PRP). However, there is a lack of standardized application procedures for clinical use. Therefore, a technique in accordance with the guidelines for advanced therapies medical products of the European Medicine Agency was developed and established. METHODS: In detail, a process for the isolation and formulation of autologous bone marrow cells (BMC) and PRP in a clinical setting was validated...
April 6, 2016: Journal of Applied Biomaterials & Functional Materials
https://www.readbyqxmd.com/read/26687734/haemocompatibility-and-cytotoxic-studies-of-non-metallic-composite-materials-modified-with-magnetic-nano-and-microparticles
#16
Maria Szymonowicz, Zbigniew Rybak, Aneta Fraczek-Szczypta, Danuta Paluch, Agnieszka Rusak, Katarzyna Nowicka, Marta Blazewicz
PURPOSE: Preventing the formation of blood clots on the surface of biomaterials and investigation of the reasons of their formation are the leading topics of the research and development of biomaterials for implants placed into the bloodstream. Biocompatibility and stability of a material in body fluids and direct effect on blood cell counts components are related both to the structure and physico-chemical state of an implant surface. The aim of this study was to determine haemocompatibility and cytotoxicity of polysulfone-based samples containing nano and micro particles of magnetite (Fe3O4)...
2015: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/26385924/calcium-regulates-the-activity-and-structural-stability-of-tpr-a-bacterial-calpain-like-peptidase
#17
Dominika Staniec, Miroslaw Ksiazek, Ida B Thøgersen, Jan J Enghild, Aneta Sroka, Danuta Bryzek, Matthew Bogyo, Magnus Abrahamson, Jan Potempa
Porphyromonas gingivalis is a peptide-fermenting asaccharolytic periodontal pathogen. Its genome contains several genes encoding cysteine peptidases other than gingipains. One of these genes (PG1055) encodes a protein called Tpr (thiol protease) that has sequence similarity to cysteine peptidases of the papain and calpain families. In this study we biochemically characterize Tpr. We found that the 55-kDa Tpr inactive zymogen proteolytically processes itself into active forms of 48, 37, and 33 kDa via sequential truncations at the N terminus...
November 6, 2015: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/26324704/factor-xiiia-dependent-retention-of-red-blood-cells-in-clots-is-mediated-by-fibrin-%C3%AE-chain-crosslinking
#18
James R Byrnes, Cédric Duval, Yiming Wang, Caroline E Hansen, Byungwook Ahn, Micah J Mooberry, Martha A Clark, Jill M Johnsen, Susan T Lord, Wilbur A Lam, Joost C M Meijers, Heyu Ni, Robert A S Ariëns, Alisa S Wolberg
Factor XIII(a) [FXIII(a)] stabilizes clots and increases resistance to fibrinolysis and mechanical disruption. FXIIIa also mediates red blood cell (RBC) retention in contracting clots and determines venous thrombus size, suggesting FXIII(a) is a potential target for reducing thrombosis. However, the mechanism by which FXIIIa retains RBCs in clots is unknown. We determined the effect of FXIII(a) on human and murine clot weight and composition. Real-time microscopy revealed extensive RBC loss from clots formed in the absence of FXIIIa activity, and RBCs exhibited transient deformation as they exited the clots...
October 15, 2015: Blood
https://www.readbyqxmd.com/read/26206586/determining-the-effect-of-storage-conditions-on-prothrombin-time-activated-partial-thromboplastin-time-and-fibrinogen-concentration-in-rat-plasma-samples
#19
Vinod Kumar Goyal, Somesh Kakade, Santosh Kumar Pandey, Anil Kalidas Gothi, Ramakrishna Nirogi
Coagulation parameters are usually included in clinical and preclinical safety studies to evaluate the effect of xenobiotics on the extrinsic or intrinsic pathways of coagulation. The analysis is generally performed at the time of terminal sacrifice where many activities are scheduled. Chances of delay in analysis are likely particularly when blood is collected for coagulation via the abdominal vena cava. This experiment was planned to assess the variations in coagulation parameters caused by delay in analysis as well as by storage conditions...
October 2015: Laboratory Animals
https://www.readbyqxmd.com/read/26178178/stability-of-coagulation-protein-activities-in-single-units-or-pools-of-cryoprecipitate-during-storage-at-20-24%C3%A2-c-for-up-to-24-h
#20
W P Sheffield, V Bhakta, C Jenkins
BACKGROUND AND OBJECTIVE: Cryoprecipitate is a concentrated source of fibrinogen and other plasma proteins. Cryoprecipitate must be transfused within 4-6 h of thawing and storage at 20-24°C. We compared plasma protein activities in single or pooled cryoprecipitate units stored at 20-24°C for 0, 4 or 24 h. MATERIALS AND METHODS: Individual cryoprecipitate units (n = 36) were thawed, diluted with sterile saline and sampled over time. Cryoprecipitate pools of eight individual units were assembled either by serial passage of diluent (Method A, n = 6 pools) or by separate dilution into a single collection bag (Method B, n = 6 pools)...
January 2016: Vox Sanguinis
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