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Platelets calcium

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https://www.readbyqxmd.com/read/29301628/platelet-derived-mrp-14-induces-monocyte-activation-in-patients-with-symptomatic-peripheral-artery-disease
#1
Rebecca Dann, Tarik Hadi, Emilie Montenont, Ludovic Boytard, Dornaszadat Alebrahim, Jordyn Feinstein, Nicole Allen, Russell Simon, Krista Barone, Kunihiro Uryu, Yu Guo, Caron Rockman, Bhama Ramkhelawon, Jeffrey S Berger
BACKGROUND: Peripheral artery disease (PAD), a diffuse manifestation of atherothrombosis, is a major cardiovascular threat. Although platelets are primary mediators of atherothrombosis, their role in the pathogenesis of PAD remains unclear. OBJECTIVES: The authors sought to investigate the role of platelets in a cohort of symptomatic PAD. METHODS: The authors profiled platelet activity, mRNA, and effector roles in patients with symptomatic PAD and in healthy controls...
January 2, 2018: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/29296853/role-of-calcium-in-regulating-the-intra-and-extracellular-cleavage-of-von-willebrand-factor-by-the-protease-adamts13
#2
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/29285174/kasabach-merritt-syndrome-combined-with-hypercalcemia-a-case-report
#3
Runying Zou, Fang Peng, Tian Yu, Saizhen Zeng, Yalan You, Keke Chen, Hui Zou, Xin Tian, Chengguang Zhu, Xiangling He
The present case report presented the diagnosis and treatment course of an infant diagnosed with Kasabach-Merritt syndrome (KMS) combined with hypercalcemia (HC). A 35-day-old infant with swelling on the upper right arm for >1 month and thrombocytopenia for 1 day was admitted to Hunan Provincial People's Hospital (Changsha, China) and a series of treatments, including γ-globulin impact, heparin anticoagulation, platelet transfusion, supplement of cryoprecipitate and fibrinogen following heparinization and inhabitation of vascular endothelial cell proliferation by propranolol, were performed...
December 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/29284605/filamin-a-modulates-store-operated-ca2-entry-by-regulating-stim1-stromal-interaction-molecule-1-orai1-association-in-human-platelets
#4
Jose J Lopez, Letizia Albarrán, Isaac Jardín, Jose Sanchez-Collado, Pedro C Redondo, Nuria Bermejo, Regis Bobe, Tarik Smani, Juan A Rosado
OBJECTIVE: Here, we provide evidence for the role of FLNA (filamin A) in the modulation of store-operated calcium entry (SOCE). APPROACH AND RESULTS: SOCE is a major mechanism for calcium influx controlled by the intracellular Ca2+ stores. On store depletion, the endoplasmic reticulum calcium sensor STIM1 (stromal interaction molecule 1) redistributes into puncta at endoplasmic reticulum/plasma membrane junctions, a process supported by the cytoskeleton, where it interacts with the calcium channels; however, the mechanism for fine-tuning SOCE is not completely understood...
December 28, 2017: Arteriosclerosis, Thrombosis, and Vascular Biology
https://www.readbyqxmd.com/read/29258493/antiplatelet-mechanism-of-an-herbal-mixture-prepared-from-the-extracts-of-phyllostachys-pubescens-leaves-and-prunus-mume-fruits
#5
Eunjung Son, Seung-Hyung Kim, Won-Kyung Yang, Dong-Seon Kim, Jimin Cha
BACKGROUND: Bamboo (Phyllostachys pubescens) leaves and Japanese apricot (Mume fructus) fruit are traditionally recognized to be safe herbs broadly used for food and medicinal purposes in Southeast Asia. Our group previously explored their antiplatelet effects. This study was designed to confirm inhibition effects of PM21 (a 2:1 mixture of bamboo leaf extract and Japanese apricot fruit extract) on platelet aggregation and evaluate its potency to use as an herbal remedy to prevent and/or treat the diseases caused by platelet aggregation and thrombus formation...
December 19, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/29241307/the-mechanism-of-mitochondria-mediated-pathway-in-the-apoptosis-of-platelets-in-immune-induced-bone-marrow-failure
#6
Qin Zheng, Yiling Jiang, Aiping Zhang, Lele Cui, Lemin Xia, Meihong Luo
Excessive platelet apoptosis is one of the pathogenic causes of immune-induced bone marrow failure (BMF). The aim of the present study was to explore the role of mitochondria-mediated pathway in the apoptosis of platelets in immune-induced BMF. An immune-induced BMF model was established in mice, which were randomly divided into three groups: normal control (CTL) group, BMF group and cyclosporine (CSA) group (n = 10 in each group). Mice were given 0.027 g/kg CSA daily in the cyclosporine group. Platelet count, mitochondrial transmembrane potential (ΔΨm), cytochrome C (CytC), phosphatidylserine (PS), calcium ion (Ca²⁺) and expression of proteins of the mitochondrial apoptotic pathway, including Bak, Bax, caspase-3, caspase-8 and caspase-9, was examined and compared...
December 15, 2017: Chinese Journal of Physiology
https://www.readbyqxmd.com/read/29236646/evaluation-of-bone-mineral-density-bmd-and-indicators-of-bone-turnover-in-patients-with-hemophilia
#7
Mehmet Dagli, Ali Kutlucan, Sedat Abusoglu, Abdulkadir Basturk, Mehmet Sozen, Leyla Kutlucan, Ali Unlu, Farise Yilmaz
A decrease in bone mass is observed in hemophilic patients. The aim of this study was to evaluate bone mineral density (BMD), parathyroid hormone (PTH), 25-hydroxy vitamin D (vitamin D), and a bone formation and resorption marker, procollagen type I N-terminal propeptide (PINP) and urinary N-terminal telopeptide (uNTX) respectively, in hemophilic patients and healthy controls. Laboratory parameters related to the pathogenesis of bone loss such as neutrophil-lymphocyte ratio (NLR) and platelet-lymphocyte ratio (PLR) were also evaluated...
December 13, 2017: Bosnian Journal of Basic Medical Sciences
https://www.readbyqxmd.com/read/29234351/space-and-time-resolved-detection-of-platelet-activation-and-von-willebrand-factor-conformational-changes-in-deep-suspensions
#8
Jacopo Biasetti, Kaushik Sampath, Angel Cortez, Alaleh Azhir, Assaf A Gilad, Thomas S Kickler, Tobias Obser, Zaverio M Ruggeri, Joseph Katz
Tracking cells and proteins' phenotypic changes in deep suspensions is critical for the direct imaging of blood-related phenomena in in vitro replica of cardiovascular systems and blood-handling devices. This paper introduces fluorescence imaging techniques for space and time resolved detection of platelet activation, von Willebrand factor (VWF) conformational changes, and VWF-platelet interaction in deep suspensions. Labeled VWF, platelets, and VWF-platelet strands are suspended in deep cuvettes, illuminated, and imaged with a high-sensitivity EM-CCD camera, allowing detection using an exposure time of 1 ms...
2017: International Journal of Biomedical Imaging
https://www.readbyqxmd.com/read/29227167/diagnosis-of-platelet-function-disorders-a-standardized-rational-and-modular-flow-cytometric-approach
#9
Oliver Andres, Katja Henning, Gabriele Strauß, Annerose Pflug, Georgi Manukjan, Harald Schulze
A high proportion of patients with mucocutaneous bleeding diathesis and suspected inherited or acquired platelet disorder remain without diagnosis even after comprehensive laboratory testing. Since flow cytometry allows investigation of resting and activated platelets on the single cell level by requiring only minimal amounts of blood, this method has become an important assay within the diagnostic algorithm, especially in pediatrics. We therefore developed a standardized and modular flow cytometric approach that contributes to clarify impaired platelet function in a rational step-by-step manner...
December 11, 2017: Platelets
https://www.readbyqxmd.com/read/29220877/increased-circulating-plasma-cells-detected-by-flow-cytometry-predicts-poor-prognosis-in-patients-with-plasma-cell-myeloma
#10
Mi Hyun Bae, Chan-Jeoung Park, Bo Hyun Kim, Young-Uk Cho, Seongsoo Jang, Dong-Hyun Lee, Eul-Ju Seo, Dok Hyun Yoon, Jung-Hee Lee, Cheolwon Suh
BACKGROUND: Flow cytometry (FC) is a reliable tool for diagnosing and monitoring of plasma cell myeloma (PCM). Recent studies used FC for quantifying plasma cells (PCs) in peripheral blood (PB) using various panels, and an adverse prognostic effect of circulating PCs (cPCs) has been reported. We investigated the prognostic implication of cPCs quantified using a simple panel in patients with PCM. METHODS: Bone marrow (BM) and PB of 85 patients with PCM were analyzed by five-color FC at time of diagnosis...
December 8, 2017: Cytometry. Part B, Clinical Cytometry
https://www.readbyqxmd.com/read/29194002/auranofin-a-thioredoxin-reductase-inhibitor-causes-platelet-death-through-calcium-overload
#11
Matthew T Harper
Platelets are central to normal hemostasis and must be tightly controlled to prevent thrombosis. However, drug treatments that also affect platelets could lead to unwanted side effects on hemostasis or thrombosis. In this study, the effect of auranofin on platelets was tested. Auranofin, a gold-based thioredoxin reductase (TRXR) inhibitor, has been previously used in arthritis. Recently, auranofin and other inhibitors of the thioredoxin system have been proposed as novel anti-cancer therapies. TRXR is an important part of the antioxidant defenses in many cells that maintain intracellular proteins in their reduced state...
December 1, 2017: Platelets
https://www.readbyqxmd.com/read/29192635/is-hemorrhage-the-reason-in-crimean-congo-hemorrhagic-fever-patients-with-neurological-signs-and-symptomsa
#12
Fatma Aktaş, Zafer Özmen, Ayşegül Altunkaş, Eda Albayrak, Fazilet Duygu, Osman Demir, Zeliha Cansel Özmen
PURPOSE: Crimean-Congo hemorrhagic fever (CCHF) is a tick-borne disease can result in mortality varying from 3.0% to 50.0%. In this study, we wished to discuss computed tomography (CT) findings together with clinical and laboratory findings in patients who had disease-related neurological signs. MATERIALS AND METHODS: The study included patients who were diagnosed with CCHF. Seventeen patients that had neurological signs were enrolled as the patient group. As a control group, 40 patients diagnosed with CCHF and did not have neurological signs were enrolled...
October 2017: Nigerian Journal of Clinical Practice
https://www.readbyqxmd.com/read/29190288/hematologic-and-biochemical-differences-between-two-free-ranging-yangtze-finless-porpoise-populations-the-implications-of-habitat
#13
Ghulam Nabi, Yujiang Hao, Xianyuan Zeng, Zheng Jinsong, Richard W McLaughlin, Ding Wang
The goals of this study were to compare the serum chemistry and hematology values of wild and semi-natural free-ranging Yangtze Finless Porpoises (Neophocaena asiaeorientalis ssp. asiaeorientalis) populations and to ascertain how these values change with the different environmental condition. For this study, samples were collected from 81 YFPs, 35 living in the wild and 46 living in a semi-natural reserve. Each population was divided into 8 life history categories; Male Calf, Female Calf, Juvenile Male, Juvenile Female, Adult Male, Pregnant, Lactating and Pregnant plus Lactating...
2017: PloS One
https://www.readbyqxmd.com/read/29184033/networks-of-enzymatically-oxidized-membrane-lipids-support-calcium-dependent-coagulation-factor-binding-to-maintain-hemostasis
#14
Sarah N Lauder, Keith Allen-Redpath, David A Slatter, Maceler Aldrovandi, Anne O'Connor, Daniel Farewell, Charles L Percy, Jessica E Molhoek, Sirpa Rannikko, Victoria J Tyrrell, Salvatore Ferla, Ginger L Milne, Alastair W Poole, Christopher P Thomas, Samya Obaji, Philip R Taylor, Simon A Jones, Phillip G de Groot, Rolf T Urbanus, Sohvi Hörkkö, Stefan Uderhardt, Jochen Ackermann, P Vince Jenkins, Andrea Brancale, Gerhard Krönke, Peter W Collins, Valerie B O'Donnell
Blood coagulation functions as part of the innate immune system by preventing bacterial invasion, and it is critical to stopping blood loss (hemostasis). Coagulation involves the external membrane surface of activated platelets and leukocytes. Using lipidomic, genetic, biochemical, and mathematical modeling approaches, we found that enzymatically oxidized phospholipids (eoxPLs) generated by the activity of leukocyte or platelet lipoxygenases (LOXs) were required for normal hemostasis and promoted coagulation factor activities in a Ca2+- and phosphatidylserine (PS)-dependent manner...
November 28, 2017: Science Signaling
https://www.readbyqxmd.com/read/29180865/fabrication-of-large-pore-mesoporous-ca-si-based-bioceramics-for-bone-regeneration
#15
Deliang Zeng, Xingdi Zhang, Xiao Wang, Lingyan Cao, Ao Zheng, Jiahui Du, Yongsheng Li, Qingfeng Huang, Xinquan Jiang
Our previous study revealed that mesoporous Ca-Si-based materials exhibited excellent osteoconduction because dissolved ions could form a layer of hydroxycarbonate apatite on the surface of the materials. However, the biological mechanisms underlying bone regeneration were largely unknown. The main aim of this study was to evaluate the osteogenic ability of large-pore mesoporous Ca-Si-based bioceramics (LPMSCs) by alkaline phosphatase assay, real-time PCR analysis, von Kossa, and alizarin red assay. Compared with large-pore mesoporous silica (LPMS), LPMSCs had a better effect on the osteogenic differentiation of dental pulp cells...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/29180071/role-of-thromboxane-a2-signaling-in-endothelium-dependent-contractions-of-arteries
#16
REVIEW
H Chen
Thromboxane A2 (TxA2) plays a very important role in various cardiovascular diseases through its action on platelet aggregation, vasoconstriction, and proliferation. The present article focuses on the role of TxA2 signaling in endothelium-dependent contractions of arteries. Arachidonic acid (AA) is metabolized by cyclooxygenase (COX) to form the unstable prostaglandin H2 which is further converted into TxA2. After being produced by thromboxane synthase (TxAS), TxA2 ultimately stimulates TxA2/prostanoid (TP) receptor to induce vasoconstriction...
November 24, 2017: Prostaglandins & Other Lipid Mediators
https://www.readbyqxmd.com/read/29167980/role-of-isolated-percutaneous-autologous-platelet-concentrate-in-delayed-union-of-long-bones
#17
Gipson Samuel, Jagdish Menon, Sreenivas Thimmaiah, Gayadhar Behera
PURPOSE: The objective of this study is to evaluate the efficacy of percutaneous platelet concentrate (PC) injection in increasing the chances of attaining union in delayed union of long bones and to know whether the time taken for union decreases with use of PC. METHODS: Forty delayed unions (15-30 weeks old) were randomized into a study group in which autologous PC prepared by blood bank centrifuge was percutaneously injected at the fracture site under image intensifier after activation with 10% calcium gluconate and a control group where patients were observed over time...
November 22, 2017: European Journal of Orthopaedic Surgery & Traumatology: Orthopédie Traumatologie
https://www.readbyqxmd.com/read/29166373/pilot-study-of-novel-lab-methodology-and-testing-of-platelet-function-in-adolescent-women-with-heavy-menstrual-bleeding
#18
Anne D Rocheleau, Ayesha Khader, Anh T P Ngo, Colin Boehnlein, Cara McDavitt, Susan Lattimore, Michael Recht, Owen J T McCarty, Kristina M Haley
INTRODUCTION: Approximately 40% of adolescent women experience heavy menstrual bleeding (HMB), and 10-62% of them have an underlying bleeding disorder (BD). Diagnosing BD remains challenging due to limitations of available clinical platelet function assays. AIM: To characterize platelet function in a population of adolescent women with HMB using small-volume whole blood assays. METHODS: Anticoagulated whole blood was used to assess platelet GPIIbIIIa activation, α-granule secretion, and aggregation in response to multiple agonists...
November 22, 2017: Pediatric Research
https://www.readbyqxmd.com/read/29160629/chitosan-and-its-composites-properties-for-use-in-bone-substitution
#19
REVIEW
Marek Stępniewski, Jacek Martynkiewicz, Jerzy Gosk
For many years, research has been carried out on finding an ideal bone substitute. Chitosan (CTS) is a naturally occurring polysaccharide, obtained mainly from, inter alia, the shells of crustaceans. It is characterized by its high level of biocompatibility, biodegradability and antimicrobial properties as well as its support in the healing of wounds. Chitosan, due to its ability to form porous structures, can be used in the production of scaffolds used in the treatment of bone defects. There are numerous studies on the use of CTS in combination with other substances which aim to improve its biological and mechanical properties...
January 2017: Polimery W Medycynie
https://www.readbyqxmd.com/read/29147489/the-effect-of-platelet-rich-plasma-on-human-mesenchymal-stem-cell-induced-bone-regeneration-of-canine-alveolar-defects-with-calcium-phosphate-based-scaffolds
#20
Reihaneh Shafieian, Maryam Moghaddam Matin, Amin Rahpeyma, Alireza Fazel, Hamideh Salari Sedigh, Ariane Sadr-Nabavi, Halimeh Hassanzadeh, Alireza Ebrahimzadeh-Bideskan
Objectives: Autologous bone transplantation known as the "gold standard" to reconstruction of osseous defects has known disadvantages. This study was designed to explore the effects of hydroxy-apatite/tricalcium-phosphate (HA/TCP) and platelet-rich plasma (PRP) on the osteogenesis ability of human adipose-derived mesenchymal stem cells (hAdMSCs) in vitro and in vivo. Materials and Methods: hAdMSCs were incubated with HA/TCP granules and/or PRP in vitro and then, cell proliferation and differentiation was assessed by MTT assay, AZR S staining and SEM examination...
October 2017: Iranian Journal of Basic Medical Sciences
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