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https://www.readbyqxmd.com/read/29328041/von-willebrand-factor-immunohistochemical-staining-quantitative-optical-density-parameters-in-the-endothelium-and-fibrinoid-of-the-placenta-during-secundines-inflammation-and-concomitant-iron-deficiency-anemia-in-gravidas
#1
V Ilika, I Davydenko
The aim of the research was to set the optical density quantitative parameters of the von Willebrand factor immunohistochemical staining (vWF) in the endothelium and fibrinoid of the placenta during the secundines inflammation concomitant with iron deficiency anemia in gravidas. The total number of 198 placentas was studied. The immunohistochemical technique was performed using the visualization of the primary antibodies to vWF with a diaminobenzidine dye polymer system. The optical density of the histochemical staining was measured by means of computer microdensitometry after the digital copies of the images had been obtained...
December 2017: Georgian Medical News
https://www.readbyqxmd.com/read/29321442/acquired-von-willebrand-syndrome-due-to-aortic-valve-stenosis-in-a-case-with-antiphospholipid-antibody
#2
Hiroaki Tanaka, Yurie Nagai, Chihiro Kuwabara, Ryo Shimizu, Akihide Umeki, Tetsufumi Yamamoto
Acquired von Willebrand syndrome (AVWS) is a bleeding disorder caused by an acquired deficiency of von Willebrand factor (vWF). Some patients with AVWS show a low bleeding tendency and are diagnosed by the presence of a mild prolongation of activated partial thromboplastin time (APTT) preoperatively. Another cause of APTT prolongation is the presence of antiphospholipid antibody (aPL). We experienced a case of AVWS due to aortic valve stenosis in a patient with aPL in whom aortic valve replacement surgery was successful with vWF replacement...
January 11, 2018: Internal Medicine
https://www.readbyqxmd.com/read/29319374/sensitive-and-specific-assessment-of-recombinant-von-willebrand-factor-in-platelet-function-analyzer
#3
Isabell Pekrul, Thorsten Kragh, Peter L Turecek, Aaron R Novack, Helmut W Ott, Michael Spannagl
BACKGROUND: Recombinant von Willebrand factor (rVWF), which was licensed in the United States in 2015, has the multimeric distribution of freshly secreted VWF with ultralarge (UL) and high molecular weight multimers (HMWM) from endothelial cells and megakaryocytes since it has never been exposed to ADAMTS13 or any other proteolytic enzyme. Measurement of closure time (CT) using the platelet function analyzer-200 (PFA-200) is highly sensitive to the presence of UL VWF multimers in added VWF concentrates...
January 10, 2018: Platelets
https://www.readbyqxmd.com/read/29315665/effect-of-remote-ischemic-preconditioning-on-left-atrial-remodeling-and-prothrombotic-response-after-radiofrequency-catheter-ablation-for-atrial-fibrillation
#4
Ruijuan Han, Xiaoqing Liu, Meili Zheng, RuiPing Zhao, XiaoYan Liu, Xiandong Yin, Xingpeng Liu, Ying Tian, Liang Shi, Kai Sun, Xinchun Yang
BACKGROUND: Radiofrequency catheter ablation (RFCA) of atrial fibrillation (AF) is known to induce left atrial remodeling and prothrombotic response. AIMS: This study aimed to evaluate the effect of remote ischemic preconditioning (RIPC) on left atrial remodeling and prothrombotic response induced by radiofrequency catheter ablation (RFCA) of atrial fibrillation (AF). METHODS: Forty-four patients with drug-refractory paroxysmal AF undergoing RFCA were randomized into RIPC (4 short episodes of forearm ischemia) and control groups before the procedure...
January 5, 2018: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/29311493/cellular-atypia-is-negatively-correlated-with-immunohistochemical-reactivity-of-cd31-and-vwf-expression-levels-in-canine-hemangiosarcoma
#5
Aprilia Maharani, Keisuke Aoshima, Shinichi Onishi, Kevin Christian Montecillo Gulay, Atsushi Kobayashi, Takashi Kimura
Canine hemangiosarcoma (HSA) is one of the most common mesenchymal tumors in dogs. Its high metastatic and growth rates are usually associated with poor prognosis. Neoplastic cells of HSA can show various levels of cellular atypia in the same mass and may consist of various populations at different differentiated stages. Up to present, however, there is no report analyzing their differentiation states by comparing cellular atypia with differentiation-related protein expressions. To evaluate whether cellular atypia can be used as a differentiation marker in HSA, we analyzed correlation between cellular atypia and intensities of CD31 and von Willebrand Factor (vWF) staining in HSA cases...
January 1, 2018: Journal of Veterinary Medical Science
https://www.readbyqxmd.com/read/29305979/target-gene-screening-and-evaluation-of-prognostic-values-in-non-small-cell-lung-cancers-by-bioinformatics-analysis
#6
Junjie Piao, Jie Sun, Yang Yang, Tiefeng Jin, Liyan Chen, Zhenhua Lin
BACKGROUND: Non-small cell lung cancer (NSCLC) is the major leading cause of cancer-related deaths worldwide. This study aims to explore molecular mechanism of NSCLC. METHODS: Microarray dataset was obtained from the Gene Expression Omnibus (GEO) database, and analyzed by using GEO2R. Functional and pathway enrichment analysis were performed based on Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) database. Then, STRING, Cytoscape and MCODE were applied to construct the Protein-protein interaction (PPI) network and screen hub genes...
January 3, 2018: Gene
https://www.readbyqxmd.com/read/29304535/circulating-angiogenic-mediators-in-patients-with-moderate-and-severe-von-willebrand-disease-a-multicentre-cross-sectional-study
#7
Dafna J Groeneveld, Yvonne V Sanders, Jelle Adelmeijer, Evelien P Mauser-Bunschoten, Johanna G van der Bom, Marjon H Cnossen, Karin Fijnvandraat, Britta A P Laros-van Gorkom, Karina Meijer, Ton Lisman, Jeroen Eikenboom, Frank W G Leebeek
Inhibition of von Willebrand factor (VWF) expression in endothelial cells results in enhanced, possible dysfunctional angiogenesis, consistent with observations of severe gastrointestinal bleedings caused by vascular malformations in patients with von Willebrand disease (VWD). VWF is stored in endothelial Weibel-Palade bodies (WPB) with several other mediators of angiogenesis, like angiopoietin-2, osteoprotegerin and galectin-3. Increased release of angiopoietin-2 has been observed in medium of endothelial cells lacking VWF, but data on circulating levels of angiogenic factors in patients with VWD are lacking...
January 2018: Thrombosis and Haemostasis
https://www.readbyqxmd.com/read/29304532/platelet-count-adamts13-activity-von-willebrand-factor-level-and-survival-in-patients-with-colorectal-cancer-5-year-follow-up-study
#8
Nóra Garam, Éva Maláti, György Sinkovits, Tímea Gombos, Attila Szederjesi, Loránd Barabás, László Gráf, Judit Kocsis, Zoltán Prohászka
Distant metastasis is a major cause of colorectal cancer-related death, but the mechanism of tumour progression is not fully understood. There is growing evidence of an interaction between tumour cells and platelets which may influence tumour progression and metastasis formation. Quality and quantity of von Willebrand factor may regulate the interaction between tumour cells and platelets. Our aim was to measure the platelet count, von Willebrand factor antigen (VWF:Ag) levels and ADAMTS13 activity in a large (n = 232) cohort of colorectal cancer patients and to examine their relationships with the stage of the disease and 5-year survival without thrombotic complications using multivariable models...
January 2018: Thrombosis and Haemostasis
https://www.readbyqxmd.com/read/29304530/alteration-of-von-willebrand-factor-after-transcatheter-aortic-valve-replacement-in-the-absence-of-paravalvular-regurgitation
#9
Felix Pawlitschek, Cornelius Keyl, Barbara Zieger, Ulrich Budde, Friedhelm Beyersdorf, Franz-Josef Neumann, Christian Stratz, Thomas G Nührenberg, Dietmar Trenk
Moderate or severe paravalvular regurgitation after transcatheter aortic valve implantation (TAVI) is frequently associated with a loss of high-molecular-weight multimers of von Willebrand factor (VWF) and a reduced VWF collagen-binding capacity. It is unclear whether this phenomenon can also be observed in patients with mild paravalvular regurgitation, and whether there are differences between patients undergoing conventional aortic valve replacement (AVR) or TAVI. We analysed the multimeric structure of VWF and the ratio of VWF collagen-binding capacity to VWF antigen pre- and postoperatively in 12 patients scheduled for AVR and in 31 patients scheduled for TAVI...
January 2018: Thrombosis and Haemostasis
https://www.readbyqxmd.com/read/29304525/low-self-rated-health-is-related-to-blood-hypercoagulability-in-patients-admitted-with-acute-myocardial-infarction
#10
Roland von Känel, Rebecca E Meister-Langraf, Jean-Paul Schmid, Jürgen Barth, Hansjörg Znoj, Ulrich Schnyder, Mary Princip
Self-rated health (SRH) is independently associated with all-cause mortality and adverse cardiovascular outcomes in individuals with and without cardiovascular disease. We examined whether SRH relates to haemostatic factors of a hypercoagulable state with prognostic impact in patients admitted with acute myocardial infarction (MI). We assessed 190 patients (median age: 59 years; all Caucasian; 83% men) within 48 hours of an acute coronary intervention in terms of demographic factors, medical and psychiatric comorbidity, health behaviours, cardiac-related variables and psychosocial characteristics...
January 2018: Thrombosis and Haemostasis
https://www.readbyqxmd.com/read/29304523/insights-into-3d-structure-of-adamts13-a-stepping-stone-towards-novel-therapeutic-treatment-of-thrombotic-thrombocytopenic-purpura
#11
Bogac Ercig, Kanin Wichapong, Chris P M Reutelingsperger, Karen Vanhoorelbeke, Jan Voorberg, Gerry A F Nicolaes
ADAMTS13 (A D: isintegrin A: nd M: etalloprotease with a T: hromboS: pondin type-1 motif, member 13: ) and von Willebrand factor (VWF) can be considered as scale weights which control platelet adhesion during primary haemostasis. In a very uncommon condition designated thrombotic thrombocytopenic purpura (TTP), functional absence of ADAMTS13 tips the balance toward VWF-mediated platelet adhesion in the microcirculation. TTP is associated with a high mortality and arises from either a congenital or acquired autoimmune deficiency of the plasma enzyme ADAMTS13...
January 2018: Thrombosis and Haemostasis
https://www.readbyqxmd.com/read/29299165/gata3-induced-vwf-upregulation-in-the-lung-adenocarcinoma-vasculature
#12
Yinghua Xu, Silin Pan, Jing Liu, Fengyun Dong, Zuowang Cheng, Jinjin Zhang, Ruixia Qi, Qi Zang, Caiqing Zhang, Xia Wang, Jiandong Zhang, Fufang Wang, Thaddeus D Allen, Ju Liu
Lung adenocarcinoma (LAC) is the leading cause of cancer-related death worldwide. Aberrant expression of genes expressed preferentially in the lung tumor vasculature may yield clues for prognosis and treatment. Von Willebrand factor (vWF) is a large multifunctional glycoprotein with a well-known function in hemostasis. However, vWF has been reported to exert an anti-tumor effect, independent of its role in hemostasis. We investigated the expression of vWF in LAC through immunohistochemical staining of tumor tissue microarrays (TMAs)...
December 15, 2017: Oncotarget
https://www.readbyqxmd.com/read/29297854/flow-induced-adhesion-of-shear-activated-polymers-to-a-substrate
#13
Masoud Hoore, Kathrin Rack, Dmitry Fedosov, Gerhard Gompper
Adhesion of polymers and proteins to substrates plays a crucial role in many technological applications and biological processes. A prominent example is the von Willebrand factor (VWF) protein, which is essential in blood clotting as it mediates adhesion of blood platelets to the site of injury at high shear rates. VWF is activated by flow and is able to bind efficiently to damaged vessel walls even under extreme flow-stress conditions; however, its adhesion is reversible when the flow strength is significantly reduced or the flow is ceased...
January 3, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29296914/severe-platelet-dysfunction-in-nhl-patients-receiving-ibrutinib-is-absent-in-patients-receiving-acalabrutinib
#14
Alexander P Bye, Amanda J Unsworth, Michael J Desborough, Catherine A T Hildyard, Niamh Appleby, David Bruce, Neline Kriek, Sophie H Nock, Tanya Sage, Craig E Hughes, Jonathan M Gibbins
The Bruton tyrosine kinase (Btk) inhibitor ibrutinib induces platelet dysfunction and causes increased risk of bleeding. Off-target inhibition of Tec is believed to contribute to platelet dysfunction and other side effects of ibrutinib. The second-generation Btk inhibitor acalabrutinib was developed with improved specificity for Btk over Tec. We investigated platelet function in patients with non-Hodgkin lymphoma (NHL) receiving ibrutinib or acalabrutinib by aggregometry and by measuring thrombus formation on collagen under arterial shear...
December 12, 2017: Blood Advances
https://www.readbyqxmd.com/read/29296853/role-of-calcium-in-regulating-the-intra-and-extracellular-cleavage-of-von-willebrand-factor-by-the-protease-adamts13
#15
Shobhit Gogia, Anju Kelkar, Changjie Zhang, Kannayakanahalli M Dayananda, Sriram Neelamegham
von Willebrand factor (VWF) and the metalloprotease a disintegrin and metalloprotease with thrombospondin type 1 motif 13 (ADAMTS13) are present both within endothelial cells (ECs) and in peripheral blood. Calcium concentrations are lower in intracellular compartments (80-400 μM) compared with the extracellular milieu (∼1.25 mM). Because low calcium favors VWF A2-domain proteolysis by ADAMTS13, the dependence of proteolysis rates on calcium was assayed both within ECs and in blood. Confocal microscopy studies demonstrate partial perinuclear colocalization of VWF with ADAMTS13 in human umbilical vein ECs (HUVECs)...
October 24, 2017: Blood Advances
https://www.readbyqxmd.com/read/29296808/severe-reduction-of-free-form-adamts13-unbound-to-von-willebrand-factor-in-plasma-of-patients-with-hellp-syndrome
#16
Yoko Yoshida, Masanori Matsumoto, Hideo Yagi, Ayami Isonishi, Kazuya Sakai, Masaki Hayakawa, Yuji Hori, Toshiyuki Sado, Hiroshi Kobayashi, Yoshihiro Fujimura
Severely decreased ADAMTS13 unbound to VWF may play a key role in the pathogenesis of HELLP syndrome.A qualitative ADAMTS13 assay may be important for diagnosing HELLP syndrome.
September 12, 2017: Blood Advances
https://www.readbyqxmd.com/read/29296746/genetic-variants-in-adamts13-as-well-as-smoking-are-major-determinants-of-plasma-adamts13-levels
#17
Qianyi Ma, Paula M Jacobi, Brian T Emmer, Colin A Kretz, Ayse Bilge Ozel, Beth McGee, Chava Kimchi-Sarfaty, David Ginsburg, Jun Z Li, Karl C Desch
The metalloprotease ADAMTS13 cleaves von Willebrand factor (VWF) in circulating blood, limiting the size of VWF multimers and regulating VWF activity. Abnormal regulation of VWF contributes to bleeding and to thrombotic disorders. ADAMTS13 levels in plasma are highly variable among healthy individuals, although the heritability and the genetic determinants of this variation are unclear. We performed genome-wide association studies of plasma ADAMTS13 concentrations in 3244 individuals from 2 independent cohorts of healthy individuals...
June 27, 2017: Blood Advances
https://www.readbyqxmd.com/read/29288565/high-and-long-term-von-willebrand-factor-expression-after-sleeping-beauty-transposon-mediated-gene-therapy-in-a-mouse-model-of-severe-von-willebrand-disease
#18
Irina Portier, Karen Vanhoorelbeke, Sebastien Verhenne, Inge Pareyn, Nele Vandeputte, Hans Deckmyn, Daniel S Goldenberg, Himanshu B Samal, Manvendra Singh, Zoltán Ivics, Zsuzsanna Izsvák, Simon F De Meyer
BACKGROUND: Type 3 von Willebrand disease (VWD) is characterized by complete absence of von Willebrand factor (VWF). Current therapy is limited to treatment with exogenous VWF/FVIII products, which only provide a short-term solution. Gene therapy offers the potential for a long-term treatment for VWD. OBJECTIVES: To develop an integrative Sleeping Beauty (SB) transposon-mediated VWF gene transfer approach in a preclinical mouse model of severe VWD. METHODS: We established a robust platform for sustained transgene murine (m)VWF expression in the liver of Vwf-/- mice by combining a liver-specific promoter with a sandwich transposon design and the SB100X transposase via hydrodynamic gene delivery...
December 29, 2017: Journal of Thrombosis and Haemostasis: JTH
https://www.readbyqxmd.com/read/29285851/von-willebrand-factor-propeptide-to-antigen-ratio-identifies-platelet-activation-and-reduced-vwf-survival-phenotype-in-mice
#19
Paula M Jacobi, Sachiko Kanaji, David Jakab, Ashley L Gehrand, Jill M Johnsen, Sandra L Haberichter
BACKGROUND: Reduced plasma survival of VWF is characteristic of patients with type 1C VWD. These subjects can be identified by an increased steady-state ratio of plasma VWFpp to VWF:Ag. A similar phenotype occurs in mice with the Mvwf1 allele. OBJECTIVES: To 1) determine if VWFpp/VWF:Ag ratio can be used to identify a "type 1C" phenotype in mice, 2) determine the most reliable method for murine blood sampling, and 3) identify the source of VWF released during problematic blood collection...
December 28, 2017: Journal of Thrombosis and Haemostasis: JTH
https://www.readbyqxmd.com/read/29282218/a-novel-role-for-the-macrophage-galactose-type-lectin-mgl-receptor-in-mediating-von-willebrand-factor-clearance
#20
Soracha E Ward, Jamie M O'Sullivan, Clive Drakeford, Sonia Aguila, Christopher N Jondle, Jyotika Sharma, Padraic G Fallon, Teresa M Brophy, Roger J S Preston, Paul Smyth, Orla Sheils, Alain Chion, James S O'Donnell
Previous studies have shown that loss of terminal sialic acid causes enhanced VWF clearance through the Ashwell-Morrell receptor (AMR). In this study we investigated (i) the specific importance of N- versus O-linked sialic acid in protecting against VWF clearance (ii) whether additional receptors contribute to the reduced half-life of hyposialylated VWF. α2-3 linked sialic acid accounts for <20% of total sialic acid and is predominantly expressed on VWF O-glycans. Nevertheless, specific digestion with α2-3 neuraminidase (α2-3Neu-VWF) was sufficient to cause markedly enhanced VWF clearance...
December 27, 2017: Blood
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