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Platelets calcium

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https://www.readbyqxmd.com/read/28742189/novel-endogenous-negative-modulators-of-platelet-function-as-potential-anti-thrombotic-targets
#1
Y-J Li, H-X Zhu, D Zhang, H-C Li, P Ma, L-Y Huang
Platelets are megakaryocyte-derived nuclear-free fragments that participate in cardiovascular diseases including acute myocardial infarction, ischemic stroke, hypertension, and atherosclerosis. At the endothelium damage site, platelets interact with sub-endothelial matrix proteins such as glycoprotein VI/Fc receptor γ-chain (GPVI/FcRγ), G protein-coupled receptor/phospholipase Cγ(β) (GPCR/PLCγ(β)), Rho/RhoK and integrin. The activation of these signaling pathways triggers intracellular calcium increase and causes platelet adhesion, aggregation, granule release and finally thrombus formation...
July 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/28726538/marked-bleeding-diathesis-in-patients-with-platelet-dysfunction-due-to-a-novel-mutation-in-rasgrp2-encoding-caldag-gefi-p-gly305asp
#2
Emilse Bermejo, Maria F Alberto, David S Paul, Aaron A Cook, Paquita Nurden, Analia Sanchez Luceros, Alan T Nurden, Wolfgang Bergmeier
Congenital platelet function disorders are often the result of defects in critical signal transduction pathways required for platelet adhesion and clot formation. Mutations affecting RASGRP2, the gene encoding the Rap GTPase activator, CalDAG-GEFI, give rise to a novel, and rare, group of platelet signal transduction abnormalities. We here report platelet function studies for two brothers (P1 and P2) expressing a novel variant of RASGRP2, CalDAG-GEFI(p.Gly305Asp). P1 and P2 have a lifelong history of bleeding with severe epistaxis successfully treated with platelet transfusions or rFVIIa...
July 20, 2017: Platelets
https://www.readbyqxmd.com/read/28723285/case-244-systemic-amyloidosis-a-complication-of-waldenstr%C3%A3-m-macroglobulinemia
#3
Maja Hrabak-Paar, Marko Kralik
History A 68-year-old man was admitted to the hospital for work-up because of generalized fatigue, anorexia, chronic diarrhea, and weight loss. Laboratory work-up revealed an erythrocyte sedimentation rate of 58 mm/h (reference range, 3-23 mm/h), a hemoglobin level of 14.1 g/dL (reference range, 13.8-17.5 g/dL), a leukocyte count of 8.1 × 10(9)/L (reference range, [3.4-9.7] × 10(9)/L), a platelet count of 223 × 10(9)/L (reference range, [158-424] × 10(9)/L), an alkaline phosphatase level of 85 U/L (1.42 μkat/L) (normal level, <142 U/L [2...
August 2017: Radiology
https://www.readbyqxmd.com/read/28719356/co-incubation-of-pmn-and-caco-2-cells-modulates-inflammatory-potential
#4
M B Schaefer, C A Schaefer, M Hecker, R E Morty, M Witzenrath, W Seeger, K Mayer
Polymorphonuclear granulocytes (PMN) are activated in inflammatory reactions. Intestinal epithelial cells are relevant for maintaining the intestinal barrier. We examined interactions of PMN and intestinal epithelial cell-like CaCo-2 cells to elucidate their regulation of inflammatory signalling and the impact of cyclooxygenase (COX), nitric oxide (NO) and platelet-activating factor (PAF). Human PMN and CaCo-2 cells, separately and in co-incubation, were stimulated with the calcium ionophore A23187 or with N-Formyl-methionyl-leucyl-phenylalanin (fMLP) that activates PMN only...
May 20, 2017: Cellular and Molecular Biology
https://www.readbyqxmd.com/read/28717879/comparison-of-the-effect-of-activated-or-non-activated-prp-in-various-concentrations-on-osteoblast-and-fibroblast-cell-line-proliferation
#5
Surena Vahabi, Zahra Yadegari, Hossein Mohammad-Rahimi
Platelet-rich plasma (PRP) contains growth factors which positively affect cell proliferation, cell differentiation, chemotaxis and intracellular matrix synthesis. All these processes are involved in wound healing and tissue regeneration; thus, PRP as a source of growth factors can be used in periodontal regenerative therapies. The purpose of the present study was to assess the effect of various concentrations of activated and non-activated PRP on proliferation of osteoblasts and fibroblasts in vitro. PRP was obtained from three healthy volunteers...
July 17, 2017: Cell and Tissue Banking
https://www.readbyqxmd.com/read/28711490/long-term-response-to-sunitinib-treatment-in-metastatic-renal-cell-carcinoma-a-pooled-analysis-of-clinical-trials
#6
Nizar M Tannir, Robert A Figlin, Martin E Gore, M Dror Michaelson, Robert J Motzer, Camillo Porta, Brian I Rini, Caroline Hoang, Xun Lin, Bernard Escudier
BACKGROUND: We characterized clinical outcomes of patients with metastatic renal cell carcinoma (mRCC) treated with sunitinib who were long-term responders (LTRs), defined as patients having progression-free survival (PFS) > 18 months. PATIENTS AND METHODS: A retrospective analysis of data from 5714 patients with mRCC treated with sunitinib in 8 phase II/III clinical trials and the expanded access program. Duration on-study and objective response rate (ORR) were compared between LTRs and patients with PFS ≤ 18 months ("others")...
June 20, 2017: Clinical Genitourinary Cancer
https://www.readbyqxmd.com/read/28705647/telomerase-activity-in-patients-with-stage-2-5d-chronic-kidney-disease
#7
Veysel Kidir, Ayse Aynali, Atila Altuntas, Salih Inal, Buket Aridogan, Mehmet Tugrul Sezer
BACKGROUND: Molecular mechanisms of increased cardiovascular mortality in chronic kidney disease (CKD) associated with biological age are not well understood. Recent studies support the hypothesis that common factors responsible for this phenomenon are cellular aging and telomere dysfunction. OBJECTIVES: The purpose of this study was to investigate the relation between telomerase activity and CKD stages. METHODS: The study included 120 patients who were followed-up for CKD stage 2-5D, composed of 30 patients of each stage and 30 healthy volunteers without any known disease who were admitted to our hospital for routine check-ups...
July 10, 2017: Nefrología: Publicación Oficial de la Sociedad Española Nefrologia
https://www.readbyqxmd.com/read/28704925/licochalcone-a-prevents-platelet-activation-and-thrombus-formation-through-the-inhibition-of-plc%C3%AE-2-pkc-akt-and-mapk-pathways
#8
Li-Ming Lien, Kuan-Hung Lin, Li-Ting Huang, Mei-Fang Tseng, Hou-Chang Chiu, Ray-Jade Chen, Wan-Jung Lu
Platelet activation is involved in cardiovascular diseases, such as atherosclerosis and ischemic stroke. Licochalcone A (LA), an active ingredient of licorice, exhibits multiple biological activities such as anti-oxidation and anti-inflammation. However, its role in platelet activation remains unclear. Therefore, the study investigated the antiplatelet mechanism of LA. Our data revealed that LA (2-10 μM) concentration dependently inhibited platelet aggregation induced by collagen, but not thrombin and U46619...
July 12, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28704250/abnormal-calcium-levels-during-trauma-resuscitation-are-associated-with-increased-mortality-increased-blood-product-use-and-greater-hospital-resource-consumption-a-pilot-investigation
#9
Emily J MacKay, Michael D Stubna, Daniel N Holena, Patrick M Reilly, Mark J Seamon, Brian P Smith, Lewis J Kaplan, Jeremy W Cannon
BACKGROUND: Admission hypocalcemia predicts both massive transfusion and mortality in severely injured patients. However, the effect of calcium derangements during resuscitation remains unexplored. We hypothesize that any hypocalcemia or hypercalcemia (either primary or from overcorrection) in the first 24 hours after severe injury is associated with increased mortality. METHODS: All patients at our institution with massive transfusion protocol activation from January 2013 through December 2014 were identified...
July 10, 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/28701909/biogenic-calcite-particles-from-microalgae-coccoliths-as-a-potential-raw-material
#10
Ioanna Jakob, Makrina Artemis Chairopoulou, Marijan Vučak, Clemens Posten, Ulrich Teipel
Synthetic calcite (CaCO3) particles are found in a broad range of applications. The geometry of particles produced from limestone or precipitation are versatile but limited to basic shapes. The microalga Emiliania huxleyi produces micro-structured calcite platelets, called coccoliths. This article presents the results of an application-orientated study, which includes characteristic values also used in the calcite industry for particle evaluation. It is demonstrated that coccoliths are significantly different from all industrial particles produced so far...
June 2017: Engineering in Life Sciences
https://www.readbyqxmd.com/read/28696993/special-communication-of-a-case-of-hypovolemic-associated-eah-lessons-learned-during-recovery
#11
Tamara Hew-Butler, Rus Hamilton, Bridget Hamilton, Zachary Colesa
Severe exercise-associated hyponatremia (EAH) is largely dilutional, whereas contributions of sodium loss remain equivocal. We present a case of EAH with encephalopathy involving an experienced male cyclist with no recollection of the event. We thereby conducted a retrospective analysis of biochemical trajectories during hospital recovery. The normalization of serum [Na], in context with changes in other variables, offered a 'reverse' perspective of the underlying pathophysiology. The following biochemical changes were temporally observed, with the return of normonatremia: 1) a decrease in serum potassium and calcium concentrations (absence of extracellular fluid dilution); 2) a decrease in total protein, blood urea nitrogen, hematocrit and hemoglobin (plasma volume expansion); and 3) an increase in mean platelet and red cell corpuscular volumes (cellular expansion after total body water and sodium deficits)...
July 2017: Current Sports Medicine Reports
https://www.readbyqxmd.com/read/28690009/amorphous-surface-layer-versus-transient-amorphous-precursor-phase-in-bone-a-case-study-investigated-by-solid-state-nmr-spectroscopy
#12
Stanislas Von Euw, Widad Ajili, Tsou-Hsi-Camille Chan-Chang, Annette Delices, Guillaume Laurent, Florence Babonneau, Nadine Nassif, Thierry Azaïs
The presence of an amorphous surface layer that coats a crystalline core has been proposed for many biominerals, including bone mineral. In parallel, transient amorphous precursor phases have been proposed in various biomineralization processes, including bone biomineralization. Here we propose a methodology to investigate the origin of these amorphous environments taking the bone tissue as a key example. This study relies on the investigation of a bone tissue sample and its comparison with synthetic calcium phosphate samples, including a stoichiometric apatite, an amorphous calcium phosphate sample, and two different biomimetic apatites...
July 6, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28688902/serum-s100-calcium-binding-protein-a4-improves-the-diagnostic-accuracy-of-transient-elastography-for-assessing-liver-fibrosis-in-hepatitis-b
#13
Li-Bo Yan, Qing-Bo Zhang, Xia Zhu, Min He, Hong Tang
AIM: The diagnostic performance of Fibroscan might be improved when combined with other serum fibrosis related markers. Previous study has demonstrated that S100A4 expression is associated with liver fibrosis in humans with hepatitis. This study aimed to clarify diagnostic accuracy of serum S100A4 levels for significant liver fibrosis in patients with chronic hepatitis B (CHB), and develop a combined algorithm of liver stiffness measurement (LSM) and S100A4 to predict significant liver fibrosis in CHB...
July 5, 2017: Clinics and Research in Hepatology and Gastroenterology
https://www.readbyqxmd.com/read/28686728/regulation-of-platelet-activating-factor-mediated-protein-tyrosine-phosphatase-1b-activation-by-a-janus-kinase-2-calpain-pathway
#14
Geneviève Hamel-Côté, Daniel Gendron, Marek Rola-Pleszczynski, Jana Stankova
Atherosclerosis is a pro-inflammatory condition underlying many cardiovascular diseases. Platelet-activating factor (PAF) and interleukin 6 (IL-6) are actively involved in the onset and progression of atherosclerotic plaques. The involvement of monocyte-derived macrophages is well characterized in the installation of inflammatory conditions in the plaque, but less is known about the contribution of monocyte-derived dendritic cells (Mo-DCs). In the same way, the involvement of calcium, phospholipase C and A2 in PAF-induced IL-6 production, in different cells types, has been shown; however, the importance of the Jak/STAT pathway and its regulation by protein-tyrosine phosphatases in this response have not been addressed...
2017: PloS One
https://www.readbyqxmd.com/read/28681653/comparison-of-the-single-syringe-push-pull-technique-with-the-discard-technique-for-obtaining-blood-samples-from-pediatric-central-venous-access-devices
#15
Sarah Hess, Mary Decker
The discard technique is the most widely used method of obtaining blood samples from patients with central venous access devices (CVADs), but risks removing more blood than is necessary for laboratory testing and may increase a patient's risk of anemia. We hypothesized that laboratory results from pediatric blood specimens obtained via CVAD using the single-syringe push-pull (formerly called the mixing) method and the discard method would be similar. Blood samples were obtained from pediatric oncology patients in a hospital setting using both collection methods and laboratory values were analyzed for concordance using the pairwise t-test, intraclass correlation coefficient, and Bland-Altman analysis methods...
July 1, 2017: Journal of Pediatric Oncology Nursing: Official Journal of the Association of Pediatric Oncology Nurses
https://www.readbyqxmd.com/read/28680886/the-phosphatase-inhibitor-calyculin-a-impairs-clot-retraction-platelet-activation-and-thrombin-generation
#16
Renáta Hudák, János Vincze, László Csernoch, Ildikó Beke Debreceni, Tamás Oláh, Ferenc Erdődi, Kenneth J Clemetson, János Kappelmayer
The aim of this study was to investigate the effect of the serine/threonine protein phosphatase inhibitor, calyculin-A (CLA), on clot formation and on the procoagulant activity of human platelets. Platelet-rich plasma (PRP) samples were preincubated with buffer or CLA and subsequently platelets were activated by the protease-activated receptor 1 (PAR-1) activator, thrombin receptor activating peptide (TRAP). Clot retraction was detected by observing clot morphology up to 1 hour, phosphatidylserine- (PS-) expression was studied by flow cytometry, and thrombin generation was measured by a fluorimetric assay...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28675986/clinical-determinants-of-clopidogrel-responsiveness-in-a-heterogeneous-cohort-of-puerto-rican-hispanics
#17
Dagmar F Hernandez-Suarez, Stuart A Scott, Matthew I Tomey, Kyle Melin, Angel Lopez-Candales, Charlotte E Buckley, Jorge Duconge
BACKGROUND: Clopidogrel is by far the most prescribed platelet adenosine diphosphate (ADP) antagonist in Puerto Rico despite the advent of newer agents (prasugrel and ticagrelor). Given the paucity of data on clopidogrel responsiveness in Hispanics, we sought to determine the association between clinical characteristics and platelet reactivity in Puerto Rican patients on clopidogrel therapy. STUDY POPULATION: A total of 100 Puerto Rican patients on clopidogrel therapy were enrolled and allocated into two groups: Group I, without high on-treatment platelet reactivity (HTPR); and Group II, with HTPR...
July 1, 2017: Therapeutic Advances in Cardiovascular Disease
https://www.readbyqxmd.com/read/28674029/atla-mediates-extracellular-dna-release-that-contributes-to-streptococcus-mutans-biofilm-formation-in-an-experimental-infective-endocarditis-rat-model
#18
Chiau-Jing Jung, Ron-Bin Hsu, Chia-Tung Shun, Chih-Chieh Hsu, Jean-San Chia
Host factors, like platelets, have been shown to enhance biofilm formation of oral commensal streptococci, inducing infective endocarditis (IE), but how bacterial components contribute to biofilm formation in vivo is still not clear. We previously demonstrated that an isogenic mutant strain of Streptococcus mutans deficient in autolysin AtlA (ΔatlA) showed reduced ability to cause vegetation in a rat model of bacterial endocarditis. However, the role of AtlA in bacterial biofilm formation is unclear. Herein, confocal laser scanning microscopy analysis showed the extracellular DNA (eDNA) embedded inside S...
July 3, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28653765/a-liquid-calcium-vitamin-d3-supplement-is-effective-prophylaxis-against-hypocalcemic-toxicity-during-apheresis-platelet-donation
#19
Robert Weinstein, Stefanie Haynes, Yong Zhao, Elda Hickson, Jeanne Linden, Patricia St Pierre, Paula Ducharme, Paula Sulmasy, Molly Graves, Jeffrey A Bailey, Linda Welch, Amie Simard, Michelle Vauthrin, Mindy Greene
Hypocalcemic toxicity, because of return of citrate anion to the donor, is the major toxicity of apheresis platelet donation. Oral calcium carbonate, given prophylactically at the start of donation, has shown limited ability to alleviate this toxicity. We examined whether repeated prophylactic doses of calcium carbonate, or of a liquid preparation containing calcium citrate, calcium phosphate, and vitamin D3 , would be more effective at preventing symptoms of hypocalcemic toxicity. Symptoms were reported by 48% of donors who received no prophylaxis and 60% of donors who received 1000 mg of oral calcium carbonate at the start of, and every 20 minutes during, donation (P = 0...
June 27, 2017: Journal of Clinical Apheresis
https://www.readbyqxmd.com/read/28641644/-clinical-significance-of-mean-platelet-volume-determination-in-multiple-myeloma
#20
Peng Gao, Zhong-Ping Xiao, Kun Fu, Mei Han
OBJECTIVE: To investigate the clinical significance of mean platelet volume(MPV) in patients with multiple myeloma(MM). METHODS: The clinical data of 198 patients with MM admitted in our hospital from March 2008 to March 2015 were collected and analyzed. The clinical data included the Ig type, hemoglobin level, platelet count, creatinine, calciumion albumin, β2-MG, LDH, plasmocytes in bone marrow, MPV, complications such as diabetes, a history of venous thromboembolism (VTE) and arterial events such as coronary artery disease, cerebrovascular disease, thrombosis and blood clotting...
June 2017: Zhongguo Shi Yan Xue Ye Xue za Zhi
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