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Platelet Aggregation

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https://www.readbyqxmd.com/read/29352103/dynamic-cycling-of-t-snare-acylation-regulates-platelet-exocytosis
#1
Jinchao Zhang, Yunjie Huang, Jing Chen, Haining Zhu, Sidney W Whiteheart
Platelets regulate vascular integrity by secreting a host of molecules that promote hemostasis and its sequelae. Given the importance of platelet exocytosis, it is critical to understand how it is controlled. The t-SNAREs, SNAP-23 and syntaxin-11, lack classical transmembrane domains (TMDs), yet both are associated with platelet membranes and redistributed into cholesterol-dependent, lipid rafts when platelets were activated. Using metabolic labeling and hydroxylamine/HCl (HA) treatment, we showed that both contain thioester-linked acyl groups...
January 19, 2018: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29351455/thrombosis-systemic-and-cardiac-oxidative-stress-and-dna-damage-induced-by-pulmonary-exposure-to-diesel-exhaust-particles-and-the-effect-of-nootkatone-thereon
#2
Abderrahim Nemmar, Suhail Al-Salam, Sumaya Beegam, Priya Yuvaraju, Badreldin H Ali
Adverse cardiovascular effects of particulate air pollution persist even at lower concentrations than those of the current air quality limit. Therefore, identification of safe and effective measures against particles-induced cardiovascular toxicity is needed. Nootkatone is a sesquiterpenoid in grapefruit with diverse bioactivities including anti-inflammatory and antioxidant effects. However, its protective effect on the cardiovascular injury induced by diesel exhaust particles (DEP) has not been studied before...
January 5, 2018: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/29351454/detrimental-effects-of-2-arachidonoylglycerol-on-whole-blood-platelet-aggregation-and-on-cerebral-blood-flow-after-a-focal-ischemic-insult-in-rats
#3
Jennifer A Shearer, Susan J Coker, Hilary Victoria Carswell Carswell
2-Arachidonoylglycerol (2-AG) is a major modulator of blood flow and platelet aggregation and a potential neuroprotectant. The present study investigated the effects of 2-AG on cerebral blood flow (CBF) in the first critical hours during middle cerebral artery occlusion (MCAO) and on platelet aggregation for the first time in rats. Adult male Sprague Dawley rats (n=30) underwent permanent MCAO under isoflurane anaesthesia and were randomly assigned to receive either 2-AG (6 mgkg-1, i.v.), monoacylglycerol lipase inhibitor JZL184 (10 mgkg-1, i...
January 5, 2018: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/29351433/%C3%AE-nitrostyrene-derivatives-attenuate-lps-mediated-acute-lung-injury-via-the-inhibition-of-neutrophil-platelet-interactions-and-net-release
#4
Yao-Wen Chang, Ching-Ping Tseng, Chih-Hsun Lee, Tsong-Long Hwang, Yu-Li Chen, Mei-Tzu Su, Kowit-Yu Chong, Ying-Wei Lan, Chin-Chung Wu, Kung-Ju Chen, Fen-Hua Lu, Hsiang-Ruei Liao, Chuen Hsueh, Pei-Wen Hsieh
Acute lung injury (ALI) and the acute respiratory distress syndrome (ARDS) are high-mortality and life-threatening diseases that are associated with neutrophil activation and accumulation within lung tissue. Emerging evidence indicates that neutrophil-platelet aggregates (NPAs) at sites of injury increases acute inflammation and contributes to the development of ALI. Even though numerous studies have increased our understanding of the pathophysiology of ALI, there is still a lack of innovative and useful treatments that reduce mortality, emphasizing that there is an urgent need for novel treatment strategies...
January 11, 2018: American Journal of Physiology. Lung Cellular and Molecular Physiology
https://www.readbyqxmd.com/read/29350995/a-review-of-analytical-methods-for-the-determination-of-clopidogrel-in-pharmaceuticals-and-biological-matrices
#5
Kavitha J, K S Kokilambigai, R Seetharaman, Harini R R, A A Kaaviya, Sowndaravel P, Lakshmi K S
P2Y12 belongs to a group of G protein - coupled (GPCR) purinergic receptors and is a receptor for adenosine diphosphate (ADP). The P2Y12 receptor is involved in platelet aggregation and acts as a biological target for treating thromboembolisms and other clotting disorders. The use of Clopidogrel (CLO) has improved the morbidity and mortality endpoints including cardiovascular death, recurrent myocardial infarction (MI) and stroke at 30 days after percutaneous coronary intervention (PCI). CLO is one such drug that specifically and irreversibly inhibits the P2Y12 subtype of ADP receptor...
January 19, 2018: Critical Reviews in Analytical Chemistry
https://www.readbyqxmd.com/read/29350605/in-situ-administration-of-abciximab-for-thrombus-resolution-during-intracranial-bypass-surgery-case-report
#6
Ian A Buchanan, Brian Lee, Arun P Amar, Steven L Giannotta
Abciximab is a glycoprotein IIb/IIIa receptor antagonist that functions to prevent platelet aggregation, thus reducing thrombus initiation and propagation. It has been widely used during percutaneous endovascular interventions, such as aneurysm coil embolization, angioplasty, atherectomy, and stent placement, as both a preventative and a salvage therapy. The use of abciximab in cardiac and neurosurgical procedures has been associated with a reduced incidence of ischemic complications and a decreased need for repeated intervention...
January 19, 2018: Journal of Neurosurgery
https://www.readbyqxmd.com/read/29343953/impact-of-acute-exacerbations-on-platelet-reactivity-in-chronic-obstructive-pulmonary-disease-patients
#7
Mariana Muñoz-Esquerre, José Luis Ferreiro, Daniel Huertas, Ana Lucrecia Marcano, Marta López-Sánchez, Gerard Roura, Joan Antoni Gómez-Hospital, Jordi Dorca, Angel Cequier, Salud Santos
Background: A higher risk of atherothrombotic cardiovascular events, which are platelet-driven processes, has been described during acute exacerbations of chronic obstructive pulmonary disease (AECOPD). However, the relevance of platelet reactivity during AECOPD and whether this is affected by antiplatelet agents are not fully elucidated to date. This study aimed to evaluate whether platelet reactivity is augmented during an exacerbation in COPD patients with and without antiplatelet therapy and its association with systemic inflammatory parameters...
2018: International Journal of Chronic Obstructive Pulmonary Disease
https://www.readbyqxmd.com/read/29340741/-platelet-inhibition-in-patients-with-coronary-cerebral-and-peripheral-macroangiopathy-what-when-and-how-long
#8
REVIEW
M Halbach, S Baldus
BACKGROUND: Inhibition of platelet aggregation can reduce the rate of vascular events in patients with coronary artery disease, carotid artery stenosis and symptomatic peripheral arterial disease. The choice of platelet inhibitors in monotherapy and combination therapy as well as the duration of dual platelet inhibition depend on the clinical situation and individual patient characteristics. GOAL: The present review summarizes the latest data from clinical trials and recommendations regarding platelet inhibition in coronary, cerebral and peripheral arterial disease...
January 16, 2018: Der Internist
https://www.readbyqxmd.com/read/29340130/mechanism-action-of-platelets-and-crucial-blood-coagulation-pathways-in-hemostasis
#9
REVIEW
Mercy Halleluyah Periayah, Ahmad Sukari Halim, Arman Zaharil Mat Saad
Blood is considered to be precious because it is the basic necessity for health; our body needs a steady provision of oxygen, supplied via blood, to reach billions of tissues and cells. Hematopoiesis is the process that generates blood cells of all lineages. However, platelets are the smallest blood component produced from the very large bone marrow cells called megakaryocytes and they play a fundamental role in thrombosis and hemostasis. Platelets contribute their hemostatic capacity via adhesion, activation and aggregation, which are triggered upon tissue injury, and these actions stimulate the coagulation factors and other mediators to achieve hemostasis...
October 1, 2017: International Journal of Hematology-oncology and Stem Cell Research
https://www.readbyqxmd.com/read/29339168/selection-of-p2y12-inhibitor-in-percutaneous-coronary-intervention-and-or-acute-coronary-syndrome
#10
REVIEW
Udaya Tantry, Eliano P Navarese, Aung Myat, Paul Gurbel
The P2Y12 receptor plays a critical role in the amplification of platelet aggregation in response to various agonists and stable thrombus generation at the site of vascular injury leading to deleterious ischemic complications. Therefore, treatment with a P2Y12 receptor blocker is a major effective strategy to prevent ischemic complications in high -risk patients with acute coronary syndrome (ACS) and patients undergoing percutaneous coronary intervention (PCI). The determination of optimal platelet inhibition is based on maximizing antithrombotic properties while minimizing bleeding risk and is critically dependent on individual patient's propensity for thrombotic and bleeding risks...
January 12, 2018: Progress in Cardiovascular Diseases
https://www.readbyqxmd.com/read/29336311/comparison-of-the-effects-of-p2y12-receptor-antagonists-on-platelet-function-and-clinical-outcomes-in-patients-undergoing-primary-pci-a-substudy-of-the-heat-ppci-trial
#11
Adeel Shahzad, Vikram Khanna, Ian Kemp, Matthew Shaw, Christine Mars, Robert Cooper, Keith Wilson, Nick Curzen, Rod H Stables
AIMS: The HEAT-PPCI trial compared bivalirudin and unfractionated heparin in patients undergoing Primary PCI. We report pre-specified, secondary analyses comparing the effects of P2Y12 inhibiting agents on platelet reactivity and clinical events. METHODS AND RESULTS: All patients received pre-procedural oral anti-platelet therapy. During the early stages of the trial, the P2Y12 inhibitor of choice was prasugrel with some use of clopidogrel. Later, routine therapy switched to ticagrelor...
January 16, 2018: EuroIntervention
https://www.readbyqxmd.com/read/29336258/association-of-thrombospondin-1-n700s-and-thrombospondin-4-a387p-gene-polymorphisms-with-the-incidence-of-acute-myocardial-infarction-in-egyptians
#12
Mohamed Z Gad, Noura Ayman Ahmed Abdelmonem, Nancy Osama Elsayed Turky
BACKGROUND: Thrombospondin (TSP) 1 and 4 are extracellular matrix glycoproteins that mediate cell proliferation, platelet aggregation and inflammatory response. Conflicting data addressed the possible contribution of TSP-1 and TSP-4 gene polymorphisms to acute myocardial infarction (AMI). OBJECTIVE: Our study aimed to examine the association of TSP-1 (N700S) and TSP-4 (A387P) genetic variants with the incidence of AMI in Egyptians. It also correlated TSP-1 variants to TSP-1 and TNF-α serum concentrations while TSP-4 variants to IL-8 concentration identifying TSPs' contribution to vascular inflammation...
January 15, 2018: Current Pharmaceutical Biotechnology
https://www.readbyqxmd.com/read/29335786/anti-inflammatory-and-antiplatelet-effects-of-non-vitamin-k-antagonist-oral-anticoagulants-in-acute-phase-of-ischemic-stroke-patients
#13
Taizen Nakase, Junta Moroi, Tatsuya Ishikawa
BACKGROUND: Recently, non-vitamin K antagonist oral anticoagulants such as direct thrombin and direct factor Xa inhibitors have been prescribed for prevention of embolic stroke. While in Japan, argatroban, also a direct thrombin inhibitor, is available for the treatment of atherothrombotic stroke patients. This study aimed to explore whether there is any differences between direct thrombin and direct factor Xa inhibitors regarding the inhibiting effect against thrombogenesis in the clinical setting of acute ischemic stroke...
January 12, 2018: Clinical and Translational Medicine
https://www.readbyqxmd.com/read/29335190/phytochemistry-and-pharmacology-of-the-genus-leonurus-the-herb-to-benefit-the-mothers-and-more
#14
REVIEW
Rui-Han Zhang, Zhi-Ke Liu, Da-Song Yang, Xing-Jie Zhang, Han-Dong Sun, Wei-Lie Xiao
Plants belonging to the genus Leonurus, also named motherwort, are traditionally used for anti-gynecological disorder in East Asia, and for sedative in Europe. Chemical investigation of the genus Leonurus not only enriched the natural products library, but also enlarged the pharmacological application of this traditional herb. In this review, we systematically summarized the structures of 259 compounds isolated from the genus Leonurus, featured with 147 labdane diterpenoids. The reported bioactivity studies up to 2017 are presented in the second part, with the main focus on the isolated compounds and also concerning the extracts...
January 12, 2018: Phytochemistry
https://www.readbyqxmd.com/read/29335059/association-of-%C3%AE-2a-adrenergic-receptor-genetic-variants-with-platelet-reactivity-in-chinese-patients-on-dual-antiplatelet-therapy-undergoing-percutaneous-coronary-intervention
#15
Ying Song, Xiao Fang Tang, Yi Yao, Chen He, Jing Jing Xu, Huan Huan Wang, Zhan Gao, Mia Wang, Jin Qing Yuan
OBJECTIVE: The alpha 2A-adrenergic receptor gene (ADRA2A) polymorphism in individuals modifies the antiplatelet response to sympathetic stimulation. The aim of this study was to investigate the effect of ADRA2A variants on platelet reactivity in Chinese patients on dual antiplatelet therapy (DAPT) after undergoing percutaneous coronary intervention (PCI). METHODS: From March 2011 to March 2013, 1,024 patients were enrolled in this prospective, single-center, observational study in China...
December 2017: Biomedical and Environmental Sciences: BES
https://www.readbyqxmd.com/read/29334511/evaluation-of-recombinant-factor-viia-tranexamic-acid-and-desmopressin-to-reduce-prasugrel-related-bleeding-a-randomised-placebo-controlled-study-in-a-rabbit-model
#16
Fanny Bonhomme, Thomas Lecompte, Charles M Samama, Anne Godier, Pierre Fontana
BACKGROUND: Prasugrel is a thienopyridine that inhibits platelet aggregation more rapidly and effectively than clopidogrel, with an increased bleeding risk. OBJECTIVE: The current study aimed to evaluate the efficacy of three nonspecific haemostatic drugs - recombinant activated factor VII (rFVIIa), tranexamic acid and desmopressin (DDAVP) - to limit blood loss after administration of prasugrel in a rabbit model of bleeding while also evaluating any prothrombotic effects...
January 13, 2018: European Journal of Anaesthesiology
https://www.readbyqxmd.com/read/29328426/relaxant-and-vasoprotective-effects-of-ginger-extracts-on-porcine-coronary-arteries
#17
Hsing-Chen Wu, Chi-Ting Horng, Shih-Chang Tsai, You-Li Lee, Shou-Cheng Hsu, Yi-Jen Tsai, Fuu-Jen Tsai, Jo-Hua Chiang, Daih-Huang Kuo, Jai-Sing Yang
Ginger (Zingiber officinale Roscoe) is a popular Chinese herbal medicine, which is considered to warm the stomach and dispel cold in traditional Chinese medicine. Ginger is widely used to treat stomach disorders, and it has been reported to exhibit antithrombotic activity via the inhibition of platelet aggregation and thromboxane B2 production in vitro. Cardiovascular disease is associated with the aberrant functioning of the heart and circulatory system; the relatively narrow vessels of the circulation are commonly affected and blocked by atherosclerosis, which may result in angina or heart attack...
January 11, 2018: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/29325746/first-report-of-the-characterization-of-a-snake-venom-apyrase-ruviapyrase-from-indian-russell-s-viper-daboia-russelii-venom
#18
Bhargab Kalita, Aparup Patra, Shagufta Jahan, Ashis K Mukherjee
A novel apyrase from Russell's viper venom (RVV) was purified and characterized, and it was named Ruviapyrase (Russell's viper apyrase). It is a high molecular weight (79.4 kDa) monomeric glycoprotein that contains 2.4% neutral sugars and 58.4% N-linked oligosaccharides and strongly binds to Concanavalin A. The LC-MS/MS analysis did not identify any protein in NCBI protein database, nevertheless some de novo sequences of Ruviapyrase showed putative conserved domain of apyrase superfamily. Ruviapyrase hydrolysed adenosine triphosphate (ATP) to a significantly greater extent (p < ...
January 8, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29324848/platelet-rich-plasma-to-treat-experimentally-induced-skin-wounds-in-animals-a-systematic-review-and-meta-analysis
#19
Adolfo Maria Tambella, Anna Rita Attili, Gilles Dupré, Andrea Cantalamessa, Stefano Martin, Vincenzo Cuteri, Sabrina Marcazzan, Massimo Del Fabbro
The objective of the study was to review current literature to determine whether the topical application of platelet-rich plasma (PRP) promotes healing in experimentally-induced full-thickness skin wounds in animals. The hypothesis was that the adjunct of PRP has a positive effect on wound healing. An electronic search was carried out on the following databases: Web of Science, Cochrane Library, PubMed, Research Gate, Cochrane Wounds Group, Veterinary Information Network. No publication date nor language restrictions were applied...
2018: PloS One
https://www.readbyqxmd.com/read/29322294/ticagrelor-inhibits-platelet-tumor-cell-interactions-and-metastasis-in-human-and-murine-breast-cancer
#20
Alison J Gareau, Colin Brien, Simon Gebremeskel, Robert S Liwski, Brent Johnston, Michael Bezuhly
Activated platelets promote the proliferation and metastatic potential of cancer cells. Platelet activation is largely mediated through ADP engagement of purinergic P2Y12 receptors on platelets. We examined the potential of the reversible P2Y12 inhibitor ticagrelor, an agent used clinically to prevent cardiovascular and cerebrovascular events, to reduce tumor growth and metastasis. In vitro, MCF-7, MDA-MB-468, and MDA-MB-231 human mammary carcinoma cells exhibited decreased interaction with platelets treated with ticagrelor compared to untreated platelets...
January 11, 2018: Clinical & Experimental Metastasis
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