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Von Willebrand Factor

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https://www.readbyqxmd.com/read/28743168/calorie-restriction-reverses-age-related-alteration-of-cavernous-neurovascular-structure-in-the-rat
#1
A Limanjaya, K-M Song, M-J Choi, K Ghatak, N N Minh, D H Kang, J Ock, G N Yin, H Y Chung, J-K Ryu, J-K Suh
Calorie restriction (CR) refers to a reduction of calorie intake without compromising essential nutrients to avoid malnutrition. CR has been established as a non-genetic method of altering longevity and attenuating biological changes associated with aging. Aging is also an important risk factor for erectile dysfunction. The aim of this study was to examine whether CR diet can reverse the age-related alterations of erectile tissue in the aged rat. Four groups of rats were used: young rats (7 months) + ad libitum, aged rats (22 months) + ad libitum, young rats + CR diet, and aged rats + CR diet...
July 25, 2017: Andrology
https://www.readbyqxmd.com/read/28743060/glucose-fluctuation-and-the-resultant-endothelial-injury-are-correlated-with-pancreatic-%C3%AE-cell-dysfunction-in-patients-with-coronary-artery-disease
#2
Makoto Murata, Hitoshi Adachi, Shigeru Oshima, Masahiko Kurabayashi
AIMS: We evaluated whether glucose fluctuation (GF) causes vascular endothelial injury and affects glucometabolic factors during lengthy oral glucose tolerance test (OGTT). METHODS: We enrolled consecutive 116 patients with coronary artery disease (CAD) who were performed coronary angiography and 4-h OGTT. Blood samples were collected before and 4h after glucose load to measure endothelial injury factor [von Willebrand factor (vWF) and vWF/a disintegrin-like and metalloproteinase with thrombospondin type-1 motifs 13 (ADAMTS-13) ratio]...
July 8, 2017: Diabetes Research and Clinical Practice
https://www.readbyqxmd.com/read/28739590/mast-cells-granular-contents-are-crucial-for-deep-vein-thrombosis-in-mice
#3
Tatyana Ponomaryov, Holly Payne, Larissa Fabritz, Denisa D Wagner, Alexander Brill
Rationale: Deep vein thrombosis (DVT) and its complication pulmonary embolism have high morbidity reducing quality of life and leading to death. Cellular mechanisms of DVT initiation remain poorly understood. Objective: We sought to determine the role of mast cells (MCs) in DVT initiation and validate MCs as a potential target for DVT prevention. Methods and Results: In a mouse model, DVT was induced by partial ligation (stenosis) of the inferior vena cava (IVC). We demonstrated that two strains of mice deficient for MCs were completely protected from DVT...
July 24, 2017: Circulation Research
https://www.readbyqxmd.com/read/28739377/blood-hemostatic-changes-during-an-ultraendurance-road-cycling-event-in-a-hot-environment
#4
Brian R Kupchak, Josh B Kazman, Jakob L Vingren, Danielle E Levitt, Elaine C Lee, Keith H Williamson, Lawrence E Armstrong, Patricia A Deuster
OBJECTIVE: This study aims to examine blood hemostatic responses to completing a 164-km road cycling event in a hot environment. METHODS: Thirty-seven subjects (28 men and 9 women; 51.8±9.5 [mean±SD] y) completed the ride in 6.6±1.1 hours. Anthropometrics (height, body mass [taken also during morning of the ride], percent body fat [%]) were collected the day before the ride. Blood samples were collected on the morning of the ride (PRE) and immediately after (IP) the subject completed the ride...
July 21, 2017: Wilderness & Environmental Medicine
https://www.readbyqxmd.com/read/28738496/-progress-in-the-relationship-between-von-willebrand-factor-and-acute-myocardial-infarction
#5
B Yan, Y M Zhao
No abstract text is available yet for this article.
July 24, 2017: Zhonghua Xin Xue Guan Bing za Zhi
https://www.readbyqxmd.com/read/28738008/randomized-placebo-controlled-study-of-the-effects-of-yunnan-baiyao-on-hemostasis-in-horses
#6
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/28734872/modeling-the-cleavage-of-von-willebrand-factor-by-adamts13-protease-in-shear-flow
#7
Brooke Huisman, Masoud Hoore, Gerhard Gompper, Dmitry A Fedosov
Von Willebrand factor (VWF) is a key protein in hemostasis as it mediates adhesion of blood platelets to a site of vascular injury. A proper distribution of VWF lengths is important for normal functioning of hemostatic processes, because a diminished number of long VWF chains may significantly limit blood clotting and lead to bleeding, while an abundant number of long VWFs may result in undesired thrombotic events. VWF size distribution is controlled by ADAMTS13 protease, which can cleave VWF chains beyond a critical shear rate when the chains are stretched enough such that cleavage sites become accessible...
July 19, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28731872/bleeding-risk-assessment-in-hemophilia-a-carriers-from-dakar-senegal
#8
Moussa Seck, Blaise F Faye, Abibatou Sall, Diariétou Sy, Sokhna A Touré, Nata Dieng, Youssou B Guéye, Macoura Gadji, Awa O Touré, Cathérine Costa, Dominique Lasne, Chantal Rothschild, Saliou Diop
: Hemophilia A carriers have an abnormal X chromosome with a molecular abnormality of FVIII gene. These carriers, long considered to be free of bleeding risk, could have the same symptoms as mild hemophiliacs. This study aim to assess bleeding risk of hemophilia A carriers monitored at the Clinical Hematology of Dakar. This is a prospective study of a period of 6 months including 22 hemophilia A carriers aged between 8 and 48 years. Hemophilia carriers were recruited using the genealogical tree of hemophiliacs followed in the service...
July 20, 2017: Blood Coagulation & Fibrinolysis: An International Journal in Haemostasis and Thrombosis
https://www.readbyqxmd.com/read/28731176/hypotonic-contrast-media-is-more-toxic-than-isotonic-contrast-media-on-endothelial-cells-in-vivo-and-in-vitro
#9
Lihui Ren, Ping Wang, Zuoyan Wang, Yong Liu, Shuzheng Lv
The aim of the current study was to investigate the cytotoxic effects of hypotonic (iopamidol) and isotonic (iodixanol) contract media (CMs) in vitro and in vivo. A total of 60 Wistar rats were included and were randomly divided into three groups (20 rats per group). Iodixanol (4 g iodine/kg), iopamidol (4 g iodine/kg) or equal volume of normal saline was injected via tail vein. HUVEC and H5V cell viability was determined by Cell Counting Kit‑8 agents. Western blotting was performed to detect ATP‑binding cassette subfamily G member 1 (ABCG1) expression...
July 21, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28729354/continuous-flow-lvad-support-causes-a-distinct-form-of-intestinal-angiodysplasia
#10
Jooeun Kang, Samson Hennessy-Strahs, Pawel Kwiatkowski, Christian Bermudez, Michael A Acker, Pavan Atluri, Patrick McConnell, Carlo R Bartoli
Rationale: The objective of this autopsy study was to determine whether abnormal gastrointestinal vascularity develops during continuous-flow LVAD support. Objective: Left ventricular assist device (LVAD) support causes pathologic degradation of von Willebrand factor (vWF) and bleeding from gastrointestinal angiodysplasia at an alarming rate. It has been speculated that LVAD support, itself may cause angiodysplasia. The relationship to abnormal vWF metabolism is unknown. We tested the hypothesis that abnormal gastrointestinal vascularity develops during continuous-flow LVAD support...
July 20, 2017: Circulation Research
https://www.readbyqxmd.com/read/28726980/interdependence-between-osteoprotegerin-and-active-von-willebrand-factor-in-long-term-cardiovascular-mortality-prediction-in-patients-undergoing-percutaneous-coronary-intervention
#11
Jolanta Siller-Matula, Irene M Lang, Christian Schoergenhofer, Mark Roest, Bernd Jilma
The interdependence of the predictive accuracy of serum osteoprotegerin (OPG) and von Willebrand factor (vWF) levels for long-term cardiovascular outcomes has not been investigated so far. This was a prospective observational cohort study in 361 patients with coronary artery disease undergoing percutaneous coronary intervention (PCI). Baseline levels of OPG, vWF, active vWF (act vWF) and ristocetin cofactor activity (vWF:RICO) were measured. Cardiovascular mortality was recorded over a median of five years...
July 20, 2017: Thrombosis and Haemostasis
https://www.readbyqxmd.com/read/28721832/biomarkers-associated-with-bleeding-risk-in-the-setting-of-atrial-fibrillation
#12
Skevos Sideris, Stefanos Archontakis, George Latsios, George Lazaros, Konstantinos Toutouzas, Eleftherios Tsiamis, Manolis Vavuranakis, Charalampos Vlachopoulos, Konstantinos Gatzoulis, Konstantinos Tsioufis, Dimitris Tousoulis
Background Prevention of thromboembolic disease, mainly stroke, with oral anticoagulants remains a major therapeutic goal in patients with atrial fibrillation. Unfortunately, despite the high efficacy, anticoagulant therapy is associated with a significant risk of, frequently catastrophic, hemorrhagic complications. Among different clinical and laboratory parameters related to an increased risk of bleeding, several biological markers have been recognized and various risk scores for bleeding have been developed...
July 18, 2017: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/28720509/the-neuropeptide-galanin-promotes-an-anti-thrombotic-phenotype-on-endocardial-endothelial-cells-from-heart-failure-patients
#13
Christina Tyrrell, Amanda Toyooka, Faiza Khan, Kent L Thornburg, James O Mudd, Wohaib Hasan
Thromboembolic complications are a significant cause of mortality and re-hospitalization in heart failure (HF) patients. One source of thrombi is the ventricular endocardial surface that becomes increasingly pro-thrombotic as HF progresses. Anticoagulation comes with bleeding risks so identifying therapeutic agents for improving cardiac endothelial health are of critical clinical importance. Endocardial endothelial cells are closely apposed to cardiac sympathetic nerves. In HF, cardiac sympathetic nerves are dysregulated and promote disease progression...
July 12, 2017: Autonomic Neuroscience: Basic & Clinical
https://www.readbyqxmd.com/read/28716745/gut-derived-endotoxin-stimulates-factor-viii-secretion-from-endothelial-cells-implications-for-hypercoagulability-in-cirrhosis
#14
Carnevale Roberto, Raparelli Valeria, Nocella Cristina, Bartimoccia Simona, Novo Marta, Severino Anna, De Falco Elena, Cammisotto Vittoria, Pasquale Chiara, Crescioli Clara, Sili Scavalli Antonio, Riggio Oliviero, Basili Stefania, Violi Francesco
BACKGROUND & AIMS: Patients with cirrhosis display enhanced blood levels of factor VIII, which may result in harmful activation of the clotting system; however, the underlying mechanism is unknown. METHODS: We performed a cross-sectional study in cirrhotic patients (n=61) and matched controls (n=61) comparing blood levels of factor VIII, von Willebrand factor (vWf), lipopolysaccharide (LPS) and positivity for Escherichia Coli DNA. Furthermore, we performed an in-vitro study to investigate if LPS, in a range of concentration similar to that found in the peripheral circulation of cirrhotic patients, was able to elicit factor VIII secretion from human umbilical vein endothelial cells (HUVEC)...
July 14, 2017: Journal of Hepatology
https://www.readbyqxmd.com/read/28716211/to-serve-and-protect-the-modulatory-role-of-von-willebrand-factor-on-factor-viii-immunogenicity
#15
REVIEW
Robin B Hartholt, Alice S van Velzen, Ivan Peyron, Anja Ten Brinke, Karin Fijnvandraat, Jan Voorberg
Hemophilia A is a bleeding disorder characterized by the absence or dysfunction of blood coagulation factor VIII (FVIII). Patients are treated with regular infusions of FVIII concentrate. In response to treatment, approximately 30% of patients with severe hemophilia A develop inhibitory antibodies targeting FVIII. Both patient and treatment related risk factors for inhibitor development have been described. Multiple studies comparing the immunogenicity of recombinant and plasma-derived FVIII have yielded conflicting results...
July 4, 2017: Blood Reviews
https://www.readbyqxmd.com/read/28715643/new-insights-into-the-non-hemostatic-role-of-von-willebrand-factor-in-endothelial-protection
#16
Silvia Agostini, Vincenzo Lionetti
During exposure to ischemia and reperfusion (I/R) insult, angiotensin II (AngII)-induced endothelin-1 (ET-1) upregulation in endothelial cells progressively impairs nitric oxide (NO) bioavailability while increasing levels of superoxide anion (O2-) and leading to the onset of endothelial dysfunction. Moreover, the overexpression of ET-1 increases the endothelial and circulating levels of von Willebrand Factor (vWF), a glycoprotein with a crucial role in arterial thrombus formation. Nowadays, the non-hemostatic role of endothelial vWF is emerging; although we not yet know if its increased expression is cause or consequence of endothelial dysfunction...
July 17, 2017: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28713823/intracardiac-hemostasis-and-fibrinolysis-parameters-in-patients-with-atrial-fibrillation
#17
Noémi Klára Tóth, Zoltán Csanádi, Orsolya Hajas, Alexandra Kiss, Edina Nagy-Baló, Kitti Bernadett Kovács, Ferenc Sarkady, László Muszbek, Zsuzsanna Bereczky, László Csiba, Zsuzsa Bagoly
AIMS: To identify intracardiac hemostasis or fibrinolysis abnormalities, which are associated with atrial fibrillation (AF) and increase the risk of thromboembolism. PATIENTS AND METHODS: Patient group consisted of 24 patients with AF and control group included 14 individuals with other supraventricular tachycardia undergoing transcatheter radiofrequency ablation. Blood samples were drawn from the femoral vein (FV), left atrium (LA), and left atrial appendage (LAA) before the ablation procedure...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28713010/hemolectin-expression-reveals-functional-heterogeneity-in-honey-bee-apis-mellifera-hemocytes
#18
Erika Gábor, Gyöngyi Cinege, Gábor Csordás, Tibor Török, Katalin Folkl-Medzihradszky, Zsuzsanna Darula, István Andó, Éva Kurucz
The identification of molecular markers considerably facilitated the classification and functional analysis of blood cell types. Apis mellifera hemocytes have been classified by morphological criteria and lectin binding properties; however, the use of molecular markers has been minimal. Here we describe a monoclonal antibody to a non-phagocytic subpopulation of A. mellifera hemocytes and to a constituent of the hemolymph clot. We demonstrate that the antibody identifies the A. mellifera hemolectin, a protein carrying human von Willebrand factor homology domains, characteristic of proteins involved in blood coagulation and platelet aggregation in mammals...
July 13, 2017: Developmental and Comparative Immunology
https://www.readbyqxmd.com/read/28712423/anxiety-and-depression-in-patients-three-months-after-myocardial-infarction-association-with-markers-of-coagulation-and-the-relevance-of-age
#19
Franziska Geiser, Anne Sarah Urbach, Ursula Harbrecht, Rupert Conrad, Bernd Pötzsch, Nele Amann, Katharina Kiesewetter, Alexandra Sieke, Kyra Wolffs, Dirk Skowasch
OBJECTIVE: Anxiety and depression are associated with an activation of coagulation and an impairment of fibrinolysis, which may contribute to the increased cardiovascular risk associated with the two disorders. However, very few studies have examined the impact of psychological distress on coagulation factors in coronary artery disease patients. The aim of this study was to assess the correlation between anxiety/depression and factors of coagulation and fibrinolysis in patients who had suffered an acute MI three months prior...
August 2017: Journal of Psychosomatic Research
https://www.readbyqxmd.com/read/28709930/particle-image-velocimetry-study-of-the-celiac-trunk-hemodynamic-induced-by-continuous-flow-left-ventricular-assist-device
#20
Francesco Scardulla, Diego Bellavia, Leonardo D'Acquisto, Giuseppe M Raffa, Salvatore Pasta
Whereas left ventricular assist device (LVAD) is the gold-standard therapy for patients with heart failure, gastrointestinal bleeding is one of the most common complications. LVAD implantation may remarkably impact aortic hemodynamics so that experimental and computational flow analyses can be used to study the disease mechanisms. Here we present an experimentally-calibrated computational model of the celiac trunk hemodynamic of a LVAD-supported patient who experienced bleeding after device implantation. Specifically, both particle image velocimetry (PIV) and echocardiography were used to measure and compare flow distributions in each branch of a phantom model of the patient abdominal aorta...
July 12, 2017: Medical Engineering & Physics
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