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Platelets

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https://www.readbyqxmd.com/read/28300459/mildly-elevated-unconjugated-bilirubin-is-associated-with-reduced-platelet-activation-related-thrombogenesis-and-inflammation-in-gilbert-s-syndrome
#1
Avinash R Kundur, Abishek B Santhakumar, Andrew C Bulmer, Indu Singh
Gilbert's syndrome (GS) is associated with a mild unconjugated hyperbilirubinemia, increased circulating antioxidant capacity, and reduced cardiovascular disease (CVD) risk. The current study investigated whether mildly elevated circulating unconjugated bilirubin (UCB) is negatively associated with multiple thrombotic risk factors including platelet activity, hemostatic function, and inflammation in individuals with GS. Blood samples were collected from matched GS and control subjects (14 per group). Activation-dependent platelet surface marker expression of PAC-1 (binds to GPIIb/IIIa surface receptors on activated platelets) and CD62P (marker for P-selectin released from activated degranulated platelets) was assessed in adenosine diphosphate (ADP)-stimulated platelets using flow cytometry...
March 16, 2017: Platelets
https://www.readbyqxmd.com/read/28287032/new-platelet-functional-method-for-identification-of-pathogenic-antibodies-in-hit-patients
#2
M L Guarino, I Massimi, S Mardente, A Lappa, S Donfrancesco, G P Visentin, F M Pulcinelli
Heparin-induced thrombocytopenia (HIT) is a thrombotic complication of heparin therapy. The most used functional method for HIT diagnosis is serotonin release assay (SRA). A different functional method based on ATP release with luciferin/luciferase long-life and stable luminescent signal is used here, which is shown to be comparable for accuracy with SRA in both negative (patients 4Ts ≤3, and negative for both anti-PF4/heparin immunoassay and SRA) and positive (4Ts >3, and positive for both PF4/heparin antibodies and SRA) patients...
March 13, 2017: Platelets
https://www.readbyqxmd.com/read/28287031/comparison-of-diverse-platelet-activation-markers-as-indicators-for-left-atrial-thrombus-in-atrial-fibrillation
#3
Daniel Tarnowski, David M Poitz, Lina Plichta, Felix M Heidrich, Stephan Wiedemann, Tobias Ruf, Johannes Mierke, Tobias Löhn, Stefanie Jellinghaus, Ruth H Strasser, Karim Ibrahim, Christian Pfluecke
Atrial fibrillation (AF) is well known for being a major risk factor of thromboembolic stroke. We could recently demonstrate an association of monocyte-platelet aggregates (MPAs) with the degree of thrombogenicity in patients with AF. This study investigated platelet activation markers, as potential biomarkers for the presence of left atrial (LA) thrombus in patients with AF. One hundred and eight patients with symptomatic AF underwent transesophageal echocardiography (TEE) before scheduled cardioversion or pulmonary vein isolation...
March 13, 2017: Platelets
https://www.readbyqxmd.com/read/28287000/risk-factors-and-clinical-outcome-of-profound-thrombocytopenia-in-adult-patients-with-denv-infections
#4
Amreeta Dhanoa, Ganeswrie Rajasekaram, Sharifah Syed Hassan, Amutha Ramadas, Nur Amelia Azreen Adnan, Chun Fatt Lau, Teik Seng Chan, Chin Fang Ngim
Severe thrombocytopenia is common in dengue virus (DENV) infections. However, studies focusing on the role of profound thrombocytopenia (PT) (nadir platelet counts ≤ 20 000/mm(3)) in DENV infections are scarce. This study aims to identify the associated features and outcome of DENV patients with PT. It involves 237 adult hospitalized patients who were DENV PCR positive. The presence of comorbidity (AOR = 4.625; 95% CI = 1.113-19.230), higher admission hematocrit (AOR = 1.213; 95% CI = 1.067-1.379), lower admission albumin (AOR = 0...
March 13, 2017: Platelets
https://www.readbyqxmd.com/read/28267395/the-role-of-platelets-in-antiphospholipid-syndrome
#5
G Baroni, A Banzato, E Bison, G Denas, G Zoppellaro, V Pengo
Despite extensive research, the pathogenesis of antiphospholipid syndrome (APS) remains obscure in many aspects. However, it is widely accepted that thrombosis is the result of a hypercoagulable state caused by antibodies directed against β2-glycoprotein I (β2-GPI), a protein whose physiological role is unknown. Although underestimated, platelets may be involved in APS and its thrombotic manifestations, especially arterial, in several ways. Thrombocytopenia is the most relevant non-criteria manifestation of APS, possibly caused by direct binding of anti-β2-GPI antibodies or anti-β2-GPI-β2-GPI complexes...
March 7, 2017: Platelets
https://www.readbyqxmd.com/read/28267389/molecular-requirements-involving-the-human-platelet-protease-activated-receptor-4-mechanism-of-activation-by-peptide-analogues-of-its-tethered-ligand
#6
I C Moschonas, T F Kellici, T Mavromoustakos, P Stathopoulos, V Tsikaris, V Magafa, A G Tzakos, A D Tselepis
Thrombin is the most potent agonist of human platelets and its effects are primarily mediated through the protease-activated receptors (PARs)-1 and -4. Although PAR-1 has higher affinity for thrombin than PAR-4, both receptors contribute to thrombin-mediated actions on platelets. Recently, a potent and selective PAR-1 antagonist (vorapaxar) was approved for clinical use in selected patients. In contrast, despite the fact that several PAR-4 antagonists have been developed, few of them have been tested in clinical trials...
March 7, 2017: Platelets
https://www.readbyqxmd.com/read/28267384/comparison-of-p2y12-inhibitors-for-mortality-and-stent-thrombosis-in-patients-with-acute-coronary-syndromes-single-center-study-of-10-793-consecutive-real-world-patients
#7
Rebecca Gosling, Momina Yazdani, Yasir Parviz, Ian R Hall, Ever D Grech, Julian P Gunn, Robert F Storey, Javaid Iqbal
Three oral platelet P2Y12 inhibitors, clopidogrel, prasugrel, and ticagrelor, are available for reducing the risk of cardiovascular death and stent thrombosis in patients with acute coronary syndromes (ACS). We sought to compare the efficacy of these antiplatelet drugs in contemporary practice. Data were collected for 10 793 consecutive ACS patients undergoing coronary angiography at Sheffield, UK (2009-2015). Since prasugrel use was mostly restricted to the STEMI subgroup, clopidogrel and ticagrelor were compared for all ACS patients, and all three agents were compared in the STEMI subgroup...
March 7, 2017: Platelets
https://www.readbyqxmd.com/read/28267383/whole-exome-sequencing-identifies-a-mutation-in-thrombomodulin-as-the-genetic-cause-of-a-suspected-platelet-disorder-in-a-family-with-normal-platelet-function
#8
Annabel Maclachlan, Gerry Dolan, Charlotte Grimley, Steve P Watson, Neil V Morgan, On Behalf Of The Uk Gapp Study Group
Here, we describe a mother and son with a lifelong bleeding tendency and posttraumatic bleeding who were recruited to the UK Genotyping and Phenotyping of Platelets (GAPP) study with a suspected platelet function disorder. However, despite a clinically significant bleeding score, both had normal platelet counts and normal platelet function. The patients' blood was analyzed by light transmission aggregometry and genotyping by whole exome sequencing, as outlined by the GAPP study. Approximately 25 000 genetic variants were found for each patient as a result of sequencing and were filtered using a specialized bioinformatics pipeline...
March 7, 2017: Platelets
https://www.readbyqxmd.com/read/28277059/detection-of-platelet-vesicles-by-flow-cytometry
#9
John P Nolan, Jennifer C Jones
The composition and function of platelet-derived extracellular vesicles (EVs) in health and in disease are a major topic of investigation in biomedical research. However, efforts to delineate specific molecular repertoires and roles for different types of EVs in the circulation are limited not only by the lack of flow cytometers capable of analyzing submicron- and nano-materials across the full size spectrum of plasma EVs, but also by the lack of standardized methods and reference materials that would permit inter-laboratory reproducibility for these analyses...
March 2, 2017: Platelets
https://www.readbyqxmd.com/read/28277058/the-interaction-between-preoperative-platelet-count-and-function-and-its-relationship-with-postoperative-bleeding-in-cardiac-surgery
#10
Marco Ranucci, Ekaterina Baryshnikova
Platelet function tests (PFTs) before cardiac surgery are predictive of postoperative bleeding and can guide a correct timing of surgery in patients under P2Y12 inhibitors. Thrombocytopenia affects PFT and may determine postoperative bleeding. The present study aims to investigate the relationship between platelet count and function, and its role in determining postoperative bleeding in cardiac surgery patients pre-treated with P2Y12 inhibitors. The study includes 589 consecutive cardiac surgery patients, tested before surgery with platelet count and multiple electrode aggregometry (MEA) ADPtest (investigating P2Y12 receptor platelet reactivity) and TRAPtest (investigating the thrombin-dependent platelet reactivity)...
March 2, 2017: Platelets
https://www.readbyqxmd.com/read/28277060/thrombelastographic-hypercoagulability-and-antiplatelet-therapy-after-coronary-artery-bypass-surgery-teg-cabg-trial-a-randomized-controlled-trial
#11
Sulman Rafiq, Pär I Johansson, Klaus F Kofoed, Jens T Lund, Peter S Olsen, Simon Bentsen, Daniel A Steinbrüchel
A hypercoagulable state has, in observational studies, been associated with increased risk of thromboembolic events. The aim of this trial was to study whether dual antiplatelet therapy (DAPT) with clopidogrel in addition to aspirin could reduce the rate of graft occlusions, thromboembolic events, and death compared to aspirin monotherapy in hypercoagulable patients undergoing coronary artery bypass surgery. A total of 1683 patients were screened for eligibility, among which 165 patients were randomized and 133 patients underwent multislice computed tomography scan to evaluate their grafts...
February 22, 2017: Platelets
https://www.readbyqxmd.com/read/28277064/inhibition-of-nmda-receptor-function-with-an-anti-glun1-s2-antibody-impairs-human-platelet-function-and-thrombosis
#12
Taryn N Green, Justin R Hamilton, Marie-Christine Morel-Kopp, Zhaohua Zheng, Ting-Yu T Chen, James I Hearn, Peng P Sun, Jack U Flanagan, Deborah Young, P Alan Barber, Matthew J During, Christopher M Ward, Maggie L Kalev-Zylinska
GluN1 is a mandatory component of N-methyl-D-aspartate receptors (NMDARs) best known for their roles in the brain, but with increasing evidence for relevance in peripheral tissues, including platelets. Certain anti-GluN1 antibodies reduce brain infarcts in rodent models of ischaemic stroke. There is also evidence that human anti-GluN1 autoantibodies reduce neuronal damage in stroke patients, but the underlying mechanism is unclear. This study investigated whether anti-GluN1-mediated neuroprotection involves inhibition of platelet function...
February 21, 2017: Platelets
https://www.readbyqxmd.com/read/28277063/quantification-of-growth-factors-in-different-platelet-concentrates
#13
Jing Qiao, Na An, Xiangying Ouyang
Concentrated growth factor (CGF), a new generation of platelet concentrate product, appears to have more abundant growth factors because of its special centrifugation process. However, there are few studies supporting this. This study was designed to evaluate the contents of major growth factors in CGF and compare them with those found in PRP (platelet-rich plasma) and PRF (platelet-rich fibrin). PRP, PRF, and CGF were obtained from the same samples of peripheral blood. Concentrations of five representative growth factors in platelets were measured with enzyme-linked immunosorbent assay (ELISA): platelet-derived growth factor-BB (PDGF-BB), transforming growth factor β-1 (TGF-β1), insulin-like growth factor-1 (IGF-1), vascular endothelial growth factor (VEGF), and basic fibroblast growth factor (bFGF)...
February 21, 2017: Platelets
https://www.readbyqxmd.com/read/28277062/platelet-function-testing-in-cardiac-surgery-a-comparative-study-of-electrical-impedance-aggregometry-and-thromboelastography
#14
Bilal H Kirmani, Robert Ian Johnson, Seema Agarwal
Point of care platelet function tests are increasingly used to assess drug-related platelet inhibition prior to cardiac surgery. Numerous devices are available including Thromboelastography (TEG(®) PlateletMapping™). The latest generation TEG(®) - the TEG(®) 6 - has recently been released incorporating a cartridge-based system with a PlateletMapping cartridge. In this study, the performance of the TEG(®) 6 PlateletMapping was compared to that of Multiple Electrode Aggregometry (MEA) performed with the Multiplate™...
February 21, 2017: Platelets
https://www.readbyqxmd.com/read/28277065/gene-of-the-issue-runx1-mutations-and-inherited-bleeding
#15
Neil V Morgan, Martina E Daly
No abstract text is available yet for this article.
February 17, 2017: Platelets
https://www.readbyqxmd.com/read/28277067/platelet-activation-by-adp-is-increased-in-selected-patients-with-anterior-ischemic-optic-neuropathy-or-retinal-vein-occlusion
#16
Claudia Kuhli-Hattenbach, Peter Hellstern, Thomas Kohnen, Lars-Olof Hattenbach
To investigate whether adenosine diphosphate (ADP)-induced platelet hyperaggregability is associated with nonarteritic anterior ischemic optic neuropathy (NAION) or retinal vein occlusion (RVO). We retrospectively reviewed thrombophilia screening data of patients with NAION or RVO without a history of arterial hypertension, diabetes mellitus, hyperlipidemia, obesity, and cigarette abuse. Patients with a positive family history for thromboembolism were not excluded. Platelet aggregation (area under the curve, AUC) after induction of 0...
February 16, 2017: Platelets
https://www.readbyqxmd.com/read/28277066/spectrum-of-5-utr-mutations-in-ankrd26-gene-in-patients-with-inherited-thrombocytopenia-c-140c-g-mutation-is-more-frequent-than-expected
#17
Silvia Ferrari, Anna Maria Lombardi, Maria Caterina Putti, Antonella Bertomoro, Irene Cortella, Isabella Barzon, Antonio Girolami, Fabrizio Fabris
No abstract text is available yet for this article.
February 16, 2017: Platelets
https://www.readbyqxmd.com/read/28150526/evaluation-of-an-automated-light-transmission-aggregometry
#18
Li-Qin Ling, Juan Liao, Qian Niu, Xia Wang, Jin Jia, Cheng-Hua Zuo, Hong Jiang, Jing Zhou
Light transmission aggregometry (LTA) is the "gold standard" for platelet function assessment, but it is time-consuming and labor intensive. Recently, an automated platelet aggregation method has been developed on a routine coagulation analyzer (Sysmex CS-2100i). In this study, the performances of CS-2100i including repeatability, correlation with a reference aggregometer (Chrono-log Model 700), and the threshold limitation of platelet counts in platelet-rich plasma (PRP) were evaluated for clinical use. The agonists were adenosine diphosphate (ADP), arachidonic acid, collagen, epinephrine, and ristocetin...
February 2, 2017: Platelets
https://www.readbyqxmd.com/read/28150525/role-of-homocysteine-and-folic-acid-on-the-altered-calcium-homeostasis-of-platelets-from-rats-with-biliary-cirrhosis
#19
Paola Romecín, Noemí M Atucha, Esther G Navarro, M Clara Ortiz, David Iyú, Juan Antonio Rosado, Joaquín García-Estañ
Previously, we have found that intracellular calcium homeostasis is altered in platelets from an experimental model of liver cirrhosis, the bile-duct ligated (BDL) rat; these alterations are compatible with the existence of a hypercoagulable state. Different studies indicate that cholestatic diseases are associated with hyperhomocysteinemia; thus, we hypothetized that it could contribute to those platelet alterations. In the present study, we have investigated the role of homocysteine (HCY) in platelet aggregation and calcium signaling in the BDL model...
February 2, 2017: Platelets
https://www.readbyqxmd.com/read/28150522/dyspnea-in-patients-treated-with-p2y12-receptor-antagonists-insights-from-the-greek-antiplatelet-grape-registry
#20
Dimitrios Alexopoulos, Ioanna Xanthopoulou, Angelos Perperis, John Goudevenos, Michalis Hamilos, George Sitafidis, Ioannis Kanakakis, Manolis Vavouranakis, George Giannopoulos, Nikolaos Barampoutis, Spyridon Deftereos, John Lekakis
In 'real life' acute coronary syndrome (ACS) patients undergoing percutaneous coronary intervention (PCI) and receiving contemporary antiplatelet treatment, data on dyspnea occurrence and impact on persistence with treatment are scarce. In a prospective, multicenter, cohort study, ACS patients undergoing PCI were recruited into the GReekAntiPlatElet (GRAPE) registry. During 1-year follow up, overall, 249/1989 (12.5%) patients reported dyspnea, more frequently at 1-month and decreasing thereafter. Multivariate analysis showed that ticagrelor administration (n = 738) at discharge was associated with the occurrence of dyspnea: Odds ratio 2...
February 2, 2017: Platelets
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