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https://www.readbyqxmd.com/read/27913583/epigenetic-control-of-microsomal-prostaglandin-e-synthase-1-by-hdac-mediated-recruitment-of-p300
#1
Christian Fork, Andrea E Vasconez, Patrick Janetzko, Carlo Angioni, Yannick Schreiber, Nerea Ferreiros, Gerd Geisslinger, Matthias S Leisegang, Dieter Steinhilber, Ralf P Brandes
: Nonsteroidal anti-inflammatory drugs (NSAIDs) are the most widely used medicine to treat pain, fever, inflammation and to inhibit platelet function. Understanding the expression regulation of enzymes of the prostanoid pathway is of great medical relevance. Histone acetylation crucially controls gene expression. We set out to identify the impact of histone deacetylases (HDACs) on the generation of prostanoids and examine the consequences on vascular function. Inhibition of HDACs (HDACi) with the pan HDAC inhibitor SAHA attenuated prostaglandin E2 (PGE2) generation in the murine vasculature and in human vascular smooth muscle cells...
December 2, 2016: Journal of Lipid Research
https://www.readbyqxmd.com/read/27913545/what-have-we-learned-from-large-population-studies-of-von-willebrand-disease
#2
Robert R Montgomery, Veronica H Flood
Von Willebrand factor (VWF) is a critical regulator of hemostatic processes, including collagen binding, platelet adhesion, and platelet aggregation. It also serves as a carrier protein to normalize plasma factor VIII synthesis, release, and survival. While VWF protein measurements by immunoassay are reasonably comparable between institutions, the measurement of VWF ristocetin cofactor activity (VWF:RCo) has significant variability. Other tests of VWF function, including collagen binding or platelet glycoprotein IIb-IIIa binding, are not universally available, yet these functional defects may cause major bleeding even with normal VWF antigen (VWF:Ag) and VWF:RCo assays...
December 2, 2016: Hematology—the Education Program of the American Society of Hematology
https://www.readbyqxmd.com/read/27913514/understanding-red-blood-cell-alloimmunization-triggers
#3
Jeanne E Hendrickson, Christopher A Tormey
Blood group alloimmunization is "triggered" when a person lacking a particular antigen is exposed to this antigen during transfusion or pregnancy. Although exposure to an antigen is necessary for alloimmunization to occur, it is not alone sufficient. Blood group antigens are diverse in structure, function, and immunogenicity. In addition to red blood cells (RBCs), a recipient of an RBC transfusion is exposed to donor plasma, white blood cells, and platelets; the potential contribution of these elements to RBC alloimmunization remains unclear...
December 2, 2016: Hematology—the Education Program of the American Society of Hematology
https://www.readbyqxmd.com/read/27913489/platelets-in-infectious-disease
#4
Elizabeth Middleton, Matthew T Rondina
Sepsis is a dynamic, acute, infectious disease syndrome characterized by dysregulated thrombo-inflammatory responses. The high mortality associated with sepsis has been recognized since the earliest clinicians' writings. Despite this, advances in the treatment of sepsis have been more modest. This is limited, in part, by the heterogeneity in the definition, population, presentation, and causal factors of infectious syndromes. Given the persistently high morbidity and mortality associated with sepsis, a better understanding of the dysregulated cellular biology underpinning sepsis is needed...
December 2, 2016: Hematology—the Education Program of the American Society of Hematology
https://www.readbyqxmd.com/read/27913488/platelets-in-liver-and-renal-disease
#5
Michele P Lambert
This review will discuss how 2 common and morbid conditions, renal disease and liver disease, alter platelet number and function. It will review the impact of thrombocytopenia on bleeding complications in patients with these disorders and whether the low platelet count actually correlates with bleeding risk. Emerging data also suggest that platelets are much more than bystanders in both renal and liver disease, but instead play an active role in the pathobiology of these disorders. This review will briefly cover the emerging information on novel roles of platelets in the biology of renal and liver disease...
December 2, 2016: Hematology—the Education Program of the American Society of Hematology
https://www.readbyqxmd.com/read/27913437/surface-expression-of-tgf%C3%AE-docking-receptor-garp-promotes-oncogenesis-and-immune-tolerance-in-breast-cancer
#6
Alessandra Metelli, Bill X Wu, Caroline W Fugle, Saleh Rachidi, Shaoli Sun, Yongliang Zhang, Jennifer Wu, Stephen Tomlinson, Philip H Howe, Yi Yang, Elizabeth Garrett-Mayer, Bei Liu, Zihai Li
GARP encoded by the Lrrc32 gene is the cell surface docking receptor for latent TGFβ, which is expressed naturally by platelets and regulatory T cells (Treg). Although Lrrc32 is amplified frequently in breast cancer, the expression and relevant functions of GARP in cancer have not been explored. Here, we report that GARP exerts oncogenic effects, promoting immune tolerance by enriching and activating latent TGFβ in the tumor microenvironment. We found that human breast, lung, and colon cancers expressed GARP aberrantly...
October 20, 2016: Cancer Research
https://www.readbyqxmd.com/read/27911420/-role-of-immunological-factors-in-the-development-of-myopic-choroidal-neovascularization
#7
A G Shchuko, N V Zaitseva, T N Yur'eva, E R Chernykh, I M Mikhalevich, A V Grigor'eva
AIM: To study the concentration of cytokines in the aqueous humor of the anterior chamber in patients with myopic choroidal neovascularization (mCNV) and to compare the results to their ophthalmic status. MATERIAL AND METHODS: A total of 19 patients (19 eyes) with mCNV treated with intravitreal ranibizumab were included in the study. The control group consisted of 15 patients (15 eyes) with myopia who had cataract surgery. Age, sex, and refractive error distribution were similar to that in the study group...
2016: Vestnik Oftalmologii
https://www.readbyqxmd.com/read/27911324/proteomics-analysis-of-blood-serums-from-alzheimer-s-disease-patients-using-itraq-labeling-technology
#8
Liming Shen, Liping Liao, Cheng Chen, Yi Guo, Dalin Song, Yong Wang, Youjiao Chen, Kaoyuan Zhang, Ming Ying, Shuiming Li, Qiong Liu, Jiazuan Ni
Alzheimer' disease (AD) is the most common form of dementia affecting up to 6% of the population over the age of 65. In order to discover differentially expressed proteins that might serve as potential biomarkers, the serums from AD patients and healthy controls were compared and analyzed using the proteomics approach of isobaric tagging for relative and absolute quantitation (iTRAQ). For the first time, AD biomarkers in serums are investigated in the Han Chinese population using iTRAQ labeled proteomics strategy...
December 1, 2016: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/27910906/analysis-of-the-serum-lipid-profile-in-polypoidal-choroidal-vasculopathy
#9
Miaoling Li, Xiongze Zhang, Nanying Liao, Baikang Ye, Yuting Peng, Yuying Ji, Feng Wen
Polypoidal choroidal vasculopathy (PCV), the predominant subtype of neovascular age-related macular degeneration in the Asian population, is associated with genetic polymorphism of lipid metabolism. In this study, we performed the untargeted lipidomics approach of ultra-performance liquid chromatography coupled with mass spectrometry (UPLC-MS) to reveal the potential discriminating lipid profile of PCV patients in serum (21 PCV patients and 19 age-matched controls). Unsupervised principal component, supervised orthogonal partial least squares analysis, correlation analysis, and heatmap analysis were performed with the data obtained by UPLC-MS...
December 2, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27909715/a-new-scaffold-containing-small-intestinal-submucosa-and-mesenchymal-stem-cells-improves-pancreatic-islet-function-and-survival-in%C3%A2-vitro-and-in%C3%A2-vivo
#10
Dan Wang, Xiaoming Ding, Wujun Xue, Jin Zheng, Xiaohui Tian, Yang Li, Xiaohong Wang, Huanjin Song, Hua Liu, Xiaohui Luo
It is unknown whether a scaffold containing both small intestinal submucosa (SIS) and mesenchymal stem cells (MSCs) for transplantation may improve pancreatic islet function and survival. In this study, we examined the effects of a SIS-MSC scaffold on islet function and survival in vitro and in vivo. MSCs and pancreatic islets were isolated from Sprague-Dawley rats, and SIS was isolated from Bamei pigs. The islets were apportioned among 3 experimental groups as follows: SIS-islets, SIS-MSC-islets and control-islets...
November 29, 2016: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/27909342/ristocetin-induced-platelet-aggregation-for-monitoring-of-bleeding-tendency-in-cll-treated-with-ibrutinib
#11
L Kazianka, C Drucker, C Skrabs, W Thomas, T Melchardt, S Struve, M Bergmann, P B Staber, E Porpaczy, C Einberger, M Heinz, A Hauswirth, M Raderer, I Pabinger, R Thalhammer, A Egle, C-M Wendtner, G Follows, G Hoermann, P Quehenberger, B Jilma, U Jaeger
Bleeding because of impaired platelet function is a major side effect of the Bruton's tyrosine kinase (BTK) inhibitor ibrutinib. We quantitatively assessed ristocetin-induced platelet aggregation (RIPA) in 64 patients with chronic lymphocytic leukemia (CLL) under ibrutinib at 287 time points. Eighty-seven bleeding episodes in 39 patients were registered (85 Common Toxicity Criteria (CTC) grade 1 or 2, 2 CTC grade 3) during a median observation period of 10.9 months. At times of bleeding, RIPA values were significantly lower (14 vs 28 U; P<0...
December 2, 2016: Leukemia: Official Journal of the Leukemia Society of America, Leukemia Research Fund, U.K
https://www.readbyqxmd.com/read/27908894/contraction-of-blood-clots-is-impaired-in-acute-ischemic-stroke
#12
Valerie Tutwiler, Alina D Peshkova, Izabella A Andrianova, Dina R Khasanova, John W Weisel, Rustem I Litvinov
OBJECTIVE: Obstructive thrombi or thrombotic emboli are the pathogenic basis of ischemic stroke. In vitro blood clots and in vivo thrombi can undergo platelet-driven contraction (retraction), resulting in volume shrinkage. Clot contraction can potentially reduce vessel occlusion and improve blood flow past emboli or thrombi. The aim of this work was to examine a potential pathogenic role of clot contraction in ischemic stroke. APPROACH AND RESULTS: We used a novel automated method that enabled us to quantify time of initiation and extent and rate of clot contraction in vitro...
December 1, 2016: Arteriosclerosis, Thrombosis, and Vascular Biology
https://www.readbyqxmd.com/read/27907814/platelet-function-one-and-three-months-after-coronary-bypass-surgery-in-relation-to-once-or-twice-daily-dosing-of-acetylsalicylic-acid
#13
Torbjörn Ivert, Magnus Dalén, Charlotte Ander, Ragnhild Stålesen, Per Näsman, Marie Lordkipanidzé, Paul Hjemdahl
INTRODUCTION: Current guidelines recommend acetylsalicylic acid (ASA) treatment after coronary artery bypass grafting (CABG) to reduce thrombotic vein graft occlusion. The optimal dosage of ASA is not known. MATERIALS AND METHODS: Forty-two patients undergoing elective CABG were randomized to receive either ASA 75mg or 160mg once daily (OD) or 75mg twice daily (BID) after the operation. Platelet function testing was performed before, and one and three months after the operation...
November 21, 2016: Thrombosis Research
https://www.readbyqxmd.com/read/27906940/a-new-technique-for-the-treatment-of-lumbar-facet-joint-syndrome-using-intra-articular-injection-with-autologous-platelet-rich-plasma
#14
Jiuping Wu, Zhenwu Du, Yang Lv, Jun Zhang, Wei Xiong, Ruiqiang Wang, Rui Liu, Guizhen Zhang, Qinyi Liu
BACKGROUND AND OBJECTIVES: Lumbar facet joint syndrome is currently suggested to be a main source of axial low back pain, and a large portion of axial low back pain is caused by disorders in lumbar facet joints. Intra-articular injection is one of the most common treatment methods in the early clinical application. Therefore, we attempt to seek a new injectable material, autologous platelet rich plasma (PRP), to treat lumbar facet syndrome, as well as to assess its therapeutic effectiveness and safety...
November 2016: Pain Physician
https://www.readbyqxmd.com/read/27905868/short-term-effects-of-low-let-radiation-on-the-endothelial-barrier-uncoupling-of-pecam-1-and-the-production-of-endothelial-microparticles
#15
Thomas Templin, Preety Sharma, Peter Guida, Peter Grabham
A significant target for radiation-induced effects is the microvascular system, which is critical to healthy tissue function and its pathology is linked to disrupted endothelial barrier function. Low-linear energy transfer (LET) ionizing radiation is a source of noncancer pathologies in humans and little is known about the early events that could initiate subsequent diseases. However, it is well known that gamma radiation causes a very early disruption of the endothelial barrier at doses below those required for cytotoxic effects...
December 1, 2016: Radiation Research
https://www.readbyqxmd.com/read/27903864/oral-thrombin-inhibitor-aggravates-platelet-adhesion-and-aggregation-during-arterial-thrombosis
#16
Tobias Petzold, Manuela Thienel, Ildiko Konrad, Irene Schubert, Ron Regenauer, Boj Hoppe, Michael Lorenz, Annekathrin Eckart, Sue Chandraratne, Carsten Lennerz, Christof Kolb, Daniel Braun, Janina Jamasbi, Richard Brandl, Siegmund Braun, Wolfgang Siess, Christian Schulz, Steffen Massberg
In patients with atrial fibrillation, oral anticoagulation with oral thrombin inhibitors (OTIs), in contrast to vitamin K antagonists (VKAs), associates with a modest increase in acute coronary syndromes (ACSs). Whether this observation is causatively linked to OTI treatment and, if so, whether OTI action is the result of a lower antithrombotic efficacy of OTI compared to VKA or reflects a yet undefined prothrombotic activity of OTI remain unclear. We analyzed platelet function in patients receiving OTI or dose-adapted VKA under static and flow conditions...
November 30, 2016: Science Translational Medicine
https://www.readbyqxmd.com/read/27903653/the-phosphatidylinositol-3-4-5-trisphosphate-pi-3-4-5-p3-binder-rasa3-regulates-phosphoinositide-3-kinase-pi-3-kinase-dependent-integrin-%C3%AE-iib%C3%AE-3-outside-in-signaling
#17
Anthony M Battram, Tom N Durrant, Ejaife O Agbani, Kate J Heesom, David S Paul, Raymond Piatt, Alastair W Poole, Peter J Cullen, Wolfgang Bergmeier, Samantha F Moore, Ingeborg Hers
The class I phosphoinositide 3-kinase (PI 3-kinase) family of lipid kinases plays an important role in integrin αIIbβ3 function, thereby supporting thrombus growth and consolidation. Here, we identify the Ras/Rap1GAP Rasa3 (GAP1IP4BP) as a major phosphatidylinositol-3,4,5-trisphosphate (PI(3,4,5)P3)-binding protein in human platelets and a key regulator of integrin αIIbβ3 outside-in signaling. We demonstrate that cytosolic Rasa3 translocates to the plasma membrane in a PI 3kinase-dependent manner upon activation of human platelets...
November 30, 2016: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/27903531/dream-plays-an-important-role-in-platelet-activation-and-thrombogenesis
#18
Kyungho Kim, Alan Tseng, Andrew Barazia, Joseph E Italiano, Jaehyung Cho
Downstream regulatory element antagonist modulator (DREAM), a transcriptional repressor, is known to modulate pain responses. However, it is unknown whether DREAM is expressed in anucleate platelets and plays a role in thrombogenesis. By using intravital microscopy with DREAM-null mice and their bone marrow chimeras, we demonstrated that both hematopoietic and non-hematopoietic cell DREAM are required for platelet thrombus formation following laser-induced arteriolar injury. In a FeCl3-induced thrombosis model, we found that compared to WT control and non-hematopoietic DREAM knockout (KO) mice, DREAM KO control and hematopoietic DREAM KO mice showed a significant delay in time to occlusion...
November 30, 2016: Blood
https://www.readbyqxmd.com/read/27902606/preoperative-aspartate-aminotransferase-to-platelet-ratio-index-apri-is-a-predictor-on-postoperative-outcomes-of-hepatocellular-carcinoma
#19
JiWen Cheng, Pu Zhao, JiangBo Liu, Xi Liu, XuanLin Wu
Preoperative aspartate aminotransferase-to-platelet ratio index (APRI) has been identified as a biochemical marker for histological fibrogenesis and fibrosis in cirrhosis and prognosis of hepatocellular carcinoma (HCC). Whether preoperative APRI can predict postoperative short-term outcomes has not been studied. The purpose of this study was to investigate the ability of preoperative APRI to predict short-term outcomes following liver resection for HCC. APRI was evaluated in 360 patients undergoing liver resection for HCC...
November 2016: Medicine (Baltimore)
https://www.readbyqxmd.com/read/27901294/performance-of-functional-fibrinogen-thromboelastography-in-children-undergoing-congenital-heart-surgery
#20
Nischal K Gautam, Chunyan Cai, Olga Pawelek, Muhammad B Rafique, Davide Cattano, Evan G Pivalizza
BACKGROUND: Functional Fibrinogen assay of the Thromboelastography (FFTEG), a whole blood viscoelastic hemostatic assay, has been used to estimate fibrinogen levels in adult patients undergoing major surgery but its performance in pediatric patients undergoing cardiac surgery requires evaluation. In this study, we evaluate the correlation between FFTEG parameters and standard laboratory tests for fibrinogen and platelet counts before and after cardiopulmonary bypass in children undergoing repair for congenital heart disease...
November 30, 2016: Paediatric Anaesthesia
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