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Von Willebrand Factor

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https://www.readbyqxmd.com/read/29140542/perioperative-von-willebrand-factor-dynamics-are-associated-with-liver-regeneration-and-predict-outcome-after-liver-resection
#1
Patrick Starlinger, David Pereyra, Stefanie Haegele, Paul Braeuer, Lukas Oehlberger, Florian Primavesi, Andreas Kohler, Florian Offensperger, Thomas Reiberger, Arnulf Ferlitsch, Barbara Messner, Guido Beldi, Stefan Staettner, Christine Brostjan, Thomas Gruenberger
Von Willebrand Factor (vWF) was found to mediate platelet influx during the early phase of liver regeneration in mice. Further, increased vWF-antigen (vWF-Ag) levels were shown to be predictive for outcome of patients with chronic liver disease. Accordingly, we aimed to assess the relevance of perioperative vWF-Ag dynamics in terms of liver regeneration and clinical outcome in patients undergoing liver resection (LR). Accordingly, we observed that vWF-Ag and its activity - estimated via ristocetin cofactor measurement - increased immediately after induction of liver regeneration and was associated with platelet accumulation within the liver...
November 15, 2017: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
https://www.readbyqxmd.com/read/29138837/vegf-secreted-by-mesenchymal-stem-cells-mediates-the-differentiation-of-endothelial-progenitor-cells-into-endothelial-cells-via-paracrine-mechanisms
#2
Quanhu Ge, Hongwei Zhang, Jixue Hou, Longfei Wan, Wenzhe Cheng, Xiaoyi Wang, Dan Dong, Congzhe Chen, Jie Xia, Jun Guo, Xueling Chen, Xiangwei Wu
Stem cell therapy is a promising treatment strategy for ischemic diseases. Mesenchymal stem cells (MSCs) and endothelial progenitor cells (EPCs) adhere to each other in the bone marrow cavity and in in vitro cultures. We have previously demonstrated that the adhesion between MSCs and EPCs is critical for MSC self‑renewal and their multi‑differentiation into osteoblasts and chondrocytes. In the present study, the influence of the indirect communication between EPCs and MSCs on the endothelial differentiation potential of EPCs was investigated, and the molecular mechanisms underlying MSC‑mediated EPC differentiation were explored...
November 14, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29135477/thrombin-potential-and-traditional-coagulation-assay-are-they-useful-in-exploring-recurrent-pregnancy-loss-risk
#3
Ilaria Romagnuolo, Monica Attanasio, Mauro Cozzolino, Enrichetta Paladino, Giancarlo Castaman, Maria E Coccia, Cinzia Fatini
: An adequate hemostatic balance is mandatory to get successful pregnancy. Obstetric complications, such as recurrent pregnancy loss (RPL), might be due to an impairment of placental perfusion possibly related to an underlying prothrombotic status. In this study, we used the global coagulation assay, calibrated automated thrombography and traditional coagulation assay to search for a possible underlying hypercoagulable status in women with history of RPL compared with uneventful pregnancy women. Thrombin generation, Fibrinogen, factor VIII (FVIII), Plasminogen Activator Inhibitor-1 (PAI-1) and von Willebrand factor levels were analyzed in 92 not pregnant unexplained RPL and 64 uneventful pregnancy women...
November 10, 2017: Blood Coagulation & Fibrinolysis: An International Journal in Haemostasis and Thrombosis
https://www.readbyqxmd.com/read/29133328/associations-of-time-of-day-with-cardiovascular-disease-risk-factors-measured-in-older-men-results-from-the-british-regional-heart-study
#4
Claudio Sartini, Peter H Whincup, S Goya Wannamethee, Barbara J Jefferis, Lucy Lennon, Gordon DO Lowe, Paul Welsh, Naveed Sattar, Richard W Morris
OBJECTIVE: We estimated associations of time of day with cardiovascular disease (CVD) risk factors measured in older men. METHODS: CVD risk factors (markers of inflammation and haemostasis, and cardiac markers) were measured on one occasion between 08:00 and 19:00 hours in 4252 men aged 60-79 years from the British Regional Heart Study. Linear models were used to estimate associations between time of day and risk factors. When an association was found, we examined whether the relationship between risk factors and cardiovascular mortality was affected by the adjustment for time of day using survival analyses...
November 12, 2017: BMJ Open
https://www.readbyqxmd.com/read/29130325/the-plasma-levels-of-adamts-13-von-willebrand-factor-vwfpp-and-fibrin-related-markers-in-patients-with-systemic-sclerosis-having-thrombosis
#5
Koji Habe, Hideo Wada, Ayaka Higashiyama, Tomoko Akeda, Kenshiro Tsuda, Ryoko Mori, Masato Kakeda, Takeshi Matsumoto, Kohshi Ohishi, Keiichi Yamanaka, Naoyuki Katayama, Hitoshi Mizutani
This study aimed to examine the hemostatic abnormalities in patients with systemic sclerosis (SSc) and the relationship between these abnormalities and thrombotic events (THEs), focusing on the difference in diffuse cutaneous SSc (dcSSc) and limited cutaneous SSc (lcSSc). The plasma levels of ADAMTS-13 (a disintegrin-like and metalloproteinase with thrombospondin type 1 motifs 13), von Willebrand factor (VWF), VWF propeptide (VWFpp), d-dimer, and soluble fibrin (SF) were measured in 233 patients with SSc. The relationship between their levels and organ involvement, including THEs and interstitial lung disease (ILD), was evaluated...
January 1, 2017: Clinical and Applied Thrombosis/hemostasis
https://www.readbyqxmd.com/read/29121798/angelica-sinensis-exerts-angiogenic-and-anti-apoptotic-effects-against-cerebral-ischemia-reperfusion-injury-by-activating-p38mapk-hif-1-formula-see-text-vegf-a-signaling-in-rats
#6
Chin-Yi Cheng, Tin-Yun Ho, Chien-Yun Hsiang, Nou-Ying Tang, Ching-Liang Hsieh, Shung-Te Kao, Yu-Chen Lee
This study evaluated the effects of Angelica sinensis extract [Dang Gui (DG)] administered before 60[Formula: see text]min of middle cerebral artery occlusion followed by 3[Formula: see text]d of reperfusion and investigated the involvement of mitogen-activated protein kinase (MAPK)/hypoxia-inducible factor (HIF)-1[Formula: see text] signaling in the cortical ischemic penumbra. DG was intraperitoneally administered at a dose of 0.25[Formula: see text]g/kg (DG-0.25g), 0.5[Formula: see text]g/kg (DG-0.5g), or 1[Formula: see text]g/kg (DG-1g) 30[Formula: see text]min before the onset of cerebral ischemia...
November 9, 2017: American Journal of Chinese Medicine
https://www.readbyqxmd.com/read/29121438/platelet-rescue-by-macrophage-depletion-in-obese-adamts13-deficient-mice-at-risk-for-thrombotic-thrombocytopenic-purpura
#7
Lotte Geys, Elien Roose, Ilse Scroyen, Hanspeter Rottensteiner, Claudia Tersteeg, Marc F Hoylaerts, Karen Vanhoorelbeke, H Roger Lijnen
BACKGROUND: Thrombotic thrombocytopenic purpura (TTP) is caused by the absence of ADAMTS13 activity. Thrombocytopenia is presumably related to the formation of microthrombi rich in von Willebrand Factor (VWF) and platelets. Obesity may be a risk factor for TTP; it is associated with abundance of macrophages that may phagocytose platelets. OBJECTIVES: To evaluate the role of obesity and ADAMTS13 deficiency in TTP, and to establish whether macrophages contribute to thrombocytopenia...
November 9, 2017: Journal of Thrombosis and Haemostasis: JTH
https://www.readbyqxmd.com/read/29119855/two-novel-variants-of-uncertain-significance-in-gp9-associated-with-bernard-soulier-syndrome-are-they-true-mutations
#8
P Boisseau, C Debord, M Eveillard, A Quéméner, M Sigaud, M Giraud, P Talarmain, C Thomas, G Landeau, S Bezieau, B Pan Petesch, M C Béné, M Fouassier
Bernard-Soulier syndrome (BSS) is an autosomal recessive major thrombocytopathy, the symptoms of which are mainly marked by mucocutaneous bleeding. This rare disease, initially described in the 1970s, is the result of an abnormal formation of the glycoprotein complex Ib-IX-V (GP Ib-IX-V), a platelet receptor of von Willebrand factor. A large number of mutations, sometimes involving the GP9 gene, have been described as possibly responsible for the disease. We report here the case of a BSS patient who presented with persistent thrombocytopenia (31x10(9)/L) and decreased surface expression of GPIb-IX-V on large platelets with anisocytosis...
November 9, 2017: Platelets
https://www.readbyqxmd.com/read/29115440/aspirin-ameliorates-cerebral-infarction-through-regulation-of-tlr4-nf%C3%A2-%C3%AE%C2%BAb%C3%A2-mediated-endoplasmic-reticulum-stress-in-mouse-model
#9
Xin Wang, Bin Shen, Dezhou Sun, Xiangyu Cui
Cerebral infarction is a cerebrovascular disease caused by local brain ischemic necrosis or softening, which is associated with diabetes, obesity, hypertension and rheumatic heart arrhythmia. Previous studies have indicated that aspirin is a potential oral anticoagulant in the treatment of cerebral ischemic stroke. However, the potential mechanism mediated by aspirin in cerebral infarction therapy is not well understood. The present study analyzed the therapeutic effects of aspirin on cerebral infarction and investigated the underlying molecular mechanism of aspirin‑ameliorated benefits for thrombolysis...
October 25, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29115418/predicting-pathogenic-genes-for-primary-myelofibrosis-based-on-a-system%C3%A2-network-approach
#10
Shu-Cai Xu, Peng Ning
The aim of the present study was to predict pathogenic genes for primary myelofibrosis (PMF) using a system‑network approach by combining protein‑protein interaction (PPI) network and gene expression data with known pathogenic genes. PMF gene expression profiles, known pathogenic genes and protein‑protein interactions were obtained. Using these data, differentially expressed genes (DEGs) were identified between PMF and normal conditions using significance analysis of microarrays, and seed genes were determined based on the intersection of known pathogenic genes and the PMF gene expression profile...
October 20, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29115006/type-2n-von-willebrand-disease-characterization-and-diagnostic-difficulties
#11
A Casonato, E Galletta, L Sarolo, V Daidone
INTRODUCTION: An abnormal factor VIII (FVIII) binding capacity of von Willebrand factor (VWF) identifies type 2N von Willebrand disease (VWD). Type 2N VWD patients are identified by means of the VWF FVIII binding (VWF:FVIIIB) assay, and especially their VWF:FVIIIB/VWF:Ag ratio (VWF:FVIIIB ratio). AIM: We report on our 15-year experience of diagnosing type 2N VWD. METHODS: We have performed 2178 VWF:FVIIIB assays in bleeders and normal subjects...
November 8, 2017: Haemophilia: the Official Journal of the World Federation of Hemophilia
https://www.readbyqxmd.com/read/29114091/circulating-endothelial-markers-in-retinal-vasculopathy-with-cerebral-leukoencephalopathy-and-systemic-manifestations
#12
Nadine Pelzer, Roel Bijkerk, Marlies E J Reinders, Anton Jan van Zonneveld, Michel D Ferrari, Arn M J M van den Maagdenberg, Jeroen Eikenboom, Gisela M Terwindt
BACKGROUND AND PURPOSE-: Retinal vasculopathy with cerebral leukoencephalopathy and systemic manifestations (RVCL-S) is a monogenic small vessel disease, caused by C-terminal truncating TREX1 mutations, that can be considered a model for stroke and vascular dementia. The pathophysiology of RVCL-S is largely unknown, but systemic endothelial involvement has been suggested, leading to pathology in the brain and other highly vascularized organs. Here, we investigated circulating endothelial markers to confirm endothelial involvement and identify biomarkers for disease activity...
November 7, 2017: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/29108103/adamts13-and-von-willebrand-factor-a-dynamic-duo
#13
REVIEW
Kieron South, David A Lane
VWF is a key player in haemostasis, acting as a carrier for FVIII and capturing platelets at sites of vascular damage. To capture platelets, it must undergo conformational changes, both within its A1 domain and at the macromolecular level through A2 domain unfolding. Its size and this function are regulated by the metalloproteinase, ADAMTS13. Recently, it has been shown that ADAMTS13 undergoes a conformational change upon interaction with VWF and that this enhances its activity towards its substrate. This review summarises recent work on these conformational transitions, describing how they are controlled...
November 6, 2017: Journal of Thrombosis and Haemostasis: JTH
https://www.readbyqxmd.com/read/29106354/characteristics-of-thawed-pooled-cryoprecipitate-stored-at-refrigerated-temperature-for-24-hours
#14
Esther P Soundar, Meredith Reyes, Laura Korte, Arthur Bracey
BACKGROUND: The need for thawed cryoprecipitate is growing. However, according to current guidelines, the shelf-life of pooled thawed cryoprecipitate at room temperature is limited because of possible bacterial contamination and loss of clotting factor activity. Here we assessed microbial growth and retention of clotting activity in cryoprecipitate stored at 4 °C after thawing to see whether its shelf life could be safely extended. MATERIALS AND METHODS: Pooled thawed cryoprecipitate units (n=10) were maintained at room temperature for 6 hours and then placed at 1-6 °C for 18 hours after thawing...
October 30, 2017: Blood Transfusion, Trasfusione del Sangue
https://www.readbyqxmd.com/read/29104003/assessment-of-the-procoagulant-potential-after-laparoscopic-sleeve-gastrectomy-a-potential-role-for-extended-thromboprophylaxis
#15
Amihai Rottenstreich, Ram Elazary, Jonathan B Yuval, Galia Spectre, Geffen Kleinstern, Yosef Kalish
BACKGROUND: Bariatric surgery is associated with increased thromboembolic risk, which may extend well beyond hospital stay. The hemostatic mechanisms implicated in this risk are not well established. OBJECTIVES: We aimed to determine the dynamics of hemostatic changes and procoagulant potential among patients undergoing laparoscopic sleeve gastrectomy, during both the early and late postoperative periods. SETTING: A university hospital. METHODS: Patients who underwent laparoscopic sleeve gastrectomy were recruited consecutively to this study...
September 28, 2017: Surgery for Obesity and related Diseases: Official Journal of the American Society for Bariatric Surgery
https://www.readbyqxmd.com/read/29099367/dental-management-of-patients-with-inherited-bleeding-disorders-a-multidisciplinary-approach
#16
Hassan Abed, Abdalrahman Ainousa
Bleeding disorders can be inherited or acquired and demonstrate different levels of severity. Dentists may be called on to treat patients who have bleeding disorders such as hemophilia A and von Willebrand disease (vWD). Dental extraction in any patient with clotting factor defects can result in a delayed bleeding episode. Local hemostatic measures provide effective results in a majority of cases but are insufficient in patients with severe hemophilia A and vWD. Therefore, consultation with the patient's hematologist is required to ensure preoperative prophylactic coverage...
November 2017: General Dentistry
https://www.readbyqxmd.com/read/29098718/outgrowing-the-laboratory-diagnosis-of-type-1-von-willebrand-disease-a-two-decade-study
#17
Mouhamed Yazan Abou-Ismail, Gbolahan O Ogunbayo, Michelle Secic, Peter A Kouides
Von Willebrand Factor (VWF) levels are known to increase with age in the general population, but that effect is unclear in von Willebrand's disease (VWD) patients. Thus, it is important to assess the trends of VWF levels with age, and the extent and rate of their normalization in patients with VWD. In a retrospective cohort study, we reviewed the medical records of 126 patients between 1996 and 2016 who met the NHLBI diagnostic criteria for Type 1 VWD or "Low VWF" (LVWF). We followed all their historically documented VWF antigen (VWF:Ag), VWF activity (VWF:RCo), and Factor VIII (FVIII) levels longitudinally over time, correlating data with clinical setting at time of testing...
November 3, 2017: American Journal of Hematology
https://www.readbyqxmd.com/read/29097365/refrigeration-induced-binding-of-von-willebrand-factor-facilitates-fast-clearance-of-refrigerated-platelets
#18
Wenchun Chen, Samuel A Druzak, Yingchun Wang, Cassandra D Josephson, Karin M Hoffmeister, Jerry Ware, Renhao Li
OBJECTIVE: Apheresis platelets for transfusion treatment are currently stored at room temperature because after refrigeration platelets are rapidly cleared on transfusion. In this study, the role of von Willebrand factor (VWF) in the clearance of refrigerated platelets is addressed. APPROACH AND RESULTS: Human and murine platelets were refrigerated in gas-permeable bags at 4°C for 24 hours. VWF binding, platelet signaling events, and platelet post-transfusion recovery and survival were measured...
November 2, 2017: Arteriosclerosis, Thrombosis, and Vascular Biology
https://www.readbyqxmd.com/read/29093073/midlife-systemic-inflammatory-markers-are-associated-with-late-life-brain-volume-the-aric-study
#19
Keenan A Walker, Ron C Hoogeveen, Aaron R Folsom, Christie M Ballantyne, David S Knopman, B Gwen Windham, Clifford R Jack, Rebecca F Gottesman
OBJECTIVE: To clarify the temporal relationship between systemic inflammation and neurodegeneration, we examined whether a higher level of circulating inflammatory markers during midlife was associated with smaller brain volumes in late life using a large biracial prospective cohort study. METHODS: Plasma levels of systemic inflammatory markers (fibrinogen, albumin, white blood cell count, von Willebrand factor, and Factor VIII) were assessed at baseline in 1,633 participants (mean age 53 [5] years, 60% female, 27% African American) enrolled in the Atherosclerosis Risk in Communities Study...
November 1, 2017: Neurology
https://www.readbyqxmd.com/read/29093059/weibel-palade-bodies-at-a-glance
#20
REVIEW
Jessica J McCormack, Mafalda Lopes da Silva, Francesco Ferraro, Francesca Patella, Daniel F Cutler
The vascular environment can rapidly alter, and the speed with which responses to both physiological and pathological changes are required necessitates the existence of a highly responsive system. The endothelium can quickly deliver bioactive molecules by regulated exocytosis of its secretory granules, the Weibel-Palade bodies (WPBs). WPBs include proteins that initiate both haemostasis and inflammation, as well those that modulate blood pressure and angiogenesis. WPB formation is driven by von Willebrand factor, their most abundant protein, which controls both shape and size of WPBs...
November 1, 2017: Journal of Cell Science
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