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Platelet Aggregation

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https://www.readbyqxmd.com/read/29149707/over-expression-of-cyclooxygenase-2-in-increased-reticulated-platelets-leads-to-aspirin-resistance-after-elective-off-pump-coronary-artery-bypass-surgery
#1
Xiaoxuan Gong, Xuezhong Wang, Zhuowen Xu, Tiantian Zhu, Qiu Zhang, Jinying Zhang, Xiaowei Wang, Chunjian Li
INTRODUCTION: Aspirin resistance (AR) has been reported to present after coronary artery bypass graft causing saphenous vein graft failure. We aimed to investigate the factors that affect the anti-platelet effect of aspirin after off-pump coronary artery bypass surgery (OPCAB). MATERIALS AND METHODS: Thirty OPCAB candidates were successively recruited. Platelet count, platelet aggregation, reticulated platelet (RP), platelets' cyclooxygenase (COX)-1 and COX-2 expressions were determined during the peri-operative period...
November 9, 2017: Thrombosis Research
https://www.readbyqxmd.com/read/29148431/comparative-efficacy-of-hemorrhage-control-of-a-novel-mesoporous-bioactive-glass-versus-two-commercial-hemostats
#2
Sara Pourshahrestani, Nahrizul Adib Bin Kadri, Ehsan Zeimaran, Nicola Gargiulo, Shani Samuel, Sangeetha Vasudevaraj Naveen, Khairunnisa Hasikin, Tunku Kamarul, Mark R Towler
Mesoporous bioactive glass containing 1% Ga2O3 (1%Ga-MBG) is attractive for hemorrhage control because of its surface chemistry which can promote blood-clotting. The present study compares this proprietary inorganic coagulation accelerator with two commercial hemostats, CeloxTM (CX) and QuikClot Advanced Clotting Sponge PlusTM (ACS+). The results indicate that the number of adherent platelets were higher on the 1%Ga-MBG and CX surfaces than ACS+ whereas a greater contact activation was seen on 1%Ga-MBG and ACS+ surfaces than CX...
November 17, 2017: Biomedical Materials
https://www.readbyqxmd.com/read/29146750/trpm7-transient-receptor-potential-melastatin-like-7-channel-kinase-controls-calcium-responses-in-arterial-thrombosis-and-stroke-in-mice
#3
Sanjeev K Gotru, Wenchun Chen, Peter Kraft, Isabelle C Becker, Karen Wolf, Simon Stritt, Susanna Zierler, Heike M Hermanns, Deviyani Rao, Anne-Laure Perraud, Carsten Schmitz, René P Zahedi, Peter J Noy, Michael G Tomlinson, Thomas Dandekar, Masayuki Matsushita, Vladimir Chubanov, Thomas Gudermann, Guido Stoll, Bernhard Nieswandt, Attila Braun
OBJECTIVE: TRPM7 (transient receptor potential melastatin-like 7 channel) is a ubiquitously expressed bifunctional protein comprising a transient receptor potential channel segment linked to a cytosolic α-type serine/threonine protein kinase domain. TRPM7 forms a constitutively active Mg(2+) and Ca(2+) permeable channel, which regulates diverse cellular processes in both healthy and diseased conditions, but the physiological role of TRPM7 kinase remains largely unknown. APPROACH AND RESULTS: Here we show that point mutation in TRPM7 kinase domain deleting the kinase activity in mice (Trpm7(R/R) ) causes a marked signaling defect in platelets...
November 16, 2017: Arteriosclerosis, Thrombosis, and Vascular Biology
https://www.readbyqxmd.com/read/29145467/adenosine-lidocaine-and-mg2-alm-fluid-therapy-attenuates-systemic-inflammation-platelet-dysfunction-and-coagulopathy-after-non-compressible-truncal-hemorrhage
#4
Hayley Letson, Geoffrey Dobson
BACKGROUND: Systemic inflammation and coagulopathy are major drivers of injury progression following hemorrhagic trauma. Our aim was to examine the effect of small-volume 3% NaCl adenosine, lidocaine and Mg2+ (ALM) bolus and 0.9% NaCl/ALM 'drip' on inflammation and coagulation in a rat model of hemorrhagic shock. METHODS: Sprague-Dawley rats (429±4 g) were randomly assigned to: 1) shams, 2) no-treatment, 3) saline-controls, 4) ALM-therapy, and 5) Hextend®. Hemorrhage was induced in anesthetized-ventilated animals by liver resection (60% left lateral lobe and 50% medial lobe)...
2017: PloS One
https://www.readbyqxmd.com/read/29144506/soluble-p-selectin-promotes-retinal-ganglion-cell-survival-through-activation-of-nrf2-signaling-after-ischemia-injury
#5
Kishan Kapupara, Yao-Tseng Wen, Rong-Kung Tsai, Shun-Ping Huang
Retinal ischemic injuries play an important role in the pathogenesis of several eye disorders. Inflammation and oxidative stress are key players in ischemic injuries. Following retinal ischemia, vascular endothelial cells and leukocytes express several inflammatory adhesion receptors, such as selectins and cell adhesion molecules. P-selectin stimulates leukocyte recruitment to platelet aggregates and has an important role in vascular homeostasis and inflammatory leukocyte extravasation. Soluble P-selectin can be neuroprotective through competitive binding to the receptors of endogenous P-selectin molecules...
November 16, 2017: Cell Death & Disease
https://www.readbyqxmd.com/read/29142942/complement-activation-induces-neutrophil-adhesion-and-neutrophil-platelet-aggregate-formation-on-vascular-endothelial-cells
#6
Magdalena Riedl, Damien G Noone, Meraj A Khan, Fred G Pluthero, Walter H A Kahr, Nades Palaniyar, Christoph Licht
Introduction: Atypical hemolytic uremic syndrome is a thrombotic microangiopathy, which is linked to hereditary or autoimmune defects in complement activators or regulators present in blood and on vascular endothelial cells. Acute thrombotic microangiopathy episodes are typically preceded by infections, which by themselves would not be expected to manifest HUS. Thus, it is possible that the host immune response contributes to the precipitation of aHUS. However, the mechanisms involved are not fully understood...
January 2017: KI Reports
https://www.readbyqxmd.com/read/29142014/model-predictions-of-deformation-embolization-and-permeability-of-partially-obstructive-blood-clots-under-variable-shear-flow
#7
Shixin Xu, Zhiliang Xu, Oleg V Kim, Rustem I Litvinov, John W Weisel, Mark Alber
Thromboembolism, one of the leading causes of morbidity and mortality worldwide, is characterized by formation of obstructive intravascular clots (thrombi) and their mechanical breakage (embolization). A novel two-dimensional multi-phase computational model is introduced that describes active interactions between the main components of the clot, including platelets and fibrin, to study the impact of various physiologically relevant blood shear flow conditions on deformation and embolization of a partially obstructive clot with variable permeability...
November 2017: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/29141676/platelets-are-activated-in-anca-associated-vasculitis-via-thrombin-pars-pathway-and-can-activate-the-alternative-complement-pathway
#8
Di Miao, Dan-Yang Li, Min Chen, Ming-Hui Zhao
BACKGROUND: In this study, we investigated the mechanism of platelet activation in patients with antineutrophil cytoplasmic antibody (ANCA)-associated vasculitis (AAV), as well as the activation of the alternative complement pathway by platelets in AAV. METHODS: CD62P and platelet-leukocyte aggregates in AAV patients were tested by flow cytometry. Platelets were stimulated by plasma from active AAV patients. The effect of the thrombin-protease-activated receptors (PARs) pathway was evaluated by blocking thrombin or PAR1 antagonists...
November 15, 2017: Arthritis Research & Therapy
https://www.readbyqxmd.com/read/29140951/platelet-aggregation-after-blunt-trauma-is-associated-with-the-acute-respiratory-distress-syndrome-and-altered-by-cigarette-smoke-exposure
#9
Farzad Moazed, Carolyn Hendrickson, Mary Nelson, Amanda Conroy, Mitchell J Cohen, Carolyn S Calfee
BACKGROUND: The risk of the acute respiratory distress syndrome (ARDS) is increased in passive and active smokers after blunt trauma. However, the mechanisms responsible, including the role of platelet aggregation, for this association are unknown. METHODS: We analyzed 215 patients with severe blunt trauma from a prospective observational cohort at a Level 1 trauma center between 2010 - 2015. Subjects underwent impedance-based platelet aggregometry in response to platelet agonists arachidonic acid (ASPI), adenosine diphosphate (ADP), collagen (COL) and thrombin receptor activating peptide-6 (TRAP)...
November 14, 2017: Journal of Trauma and Acute Care Surgery
https://www.readbyqxmd.com/read/29140832/platelet-function-changes-in-a-time-dependent-manner-following-traumatic-brain-injury-in-a-murine-model
#10
Grace E Martin, Brent Xia, Young Kim, Mark D Johnson, Rosalie Veile, Lou Ann Friend, Amy T Makley, Charles C Caldwell, Michael D Goodman
Traumatic brain injury (TBI) results in systemic changes in coagulation and inflammation that contribute to post-traumatic morbidity and mortality. The potential interaction of platelets and pro-inflammatory cytokines in the modulation of coagulation, microthrombosis, and venous thromboembolic events after moderate TBI (TBI) has not been determined. Using a murine model, we hypothesized 1) that the degree of platelet-induced coagulation varies depending on the platelet aggregation agonist 2) platelet-induced coagulation changes in a time-dependent manner following TBI, and 3) changes in platelet-induced coagulation are mirrored by changes in the levels of circulating pro-inflammatory cytokines...
November 14, 2017: Shock
https://www.readbyqxmd.com/read/29140295/quantification-of-cardiovascular-disease-biomarkers-in-human-platelets-by-targeted-mass-spectrometry
#11
Sebastian Malchow, Christina Loosse, Albert Sickmann, Christin Lorenz
Platelets are known to be key players in thrombosis and hemostasis, contributing to the genesis and progression of cardiovascular diseases. Due to their pivotal role in human physiology and pathology, platelet function is regulated tightly by numerous factors which have either stimulatory or inhibitory effects. A variety of factors, e.g., collagen, fibrinogen, ADP, vWF, thrombin, and thromboxane promote platelet adhesion and aggregation by utilizing multiple intracellular signal cascades. To quantify platelet proteins for this work, a targeted proteomics workflow was applied...
November 15, 2017: Proteomes
https://www.readbyqxmd.com/read/29139273/-comparative-study-on-promoting-blood-effects-of-danshen-honghua-herb-pair-with-different-preparations-based-on-chemometrics-and-multi-attribute-comprehensive-index-methods
#12
Cheng Qu, Yu-Ping Tang, Xu-Qin Shi, Gui-Sheng Zhou, Er-Xin Shang, Li-Li Shang, Jian-Ming Guo, Pei Liu, Jing Zhao, Bu-Chang Zhao, Jin-Ao Duan
To evaluate the promoting blood circulation and removing blood stasis effects of Danshen-Honghua(DH) herb pair with different preparations (alcohol, 50% alcohol and water) on blood rheology and coagulation functions in acute blood stasis rats, and optimize the best preparation method of DH based on principal component analysis(PCA), hierarchical cluster heatmap analysis and multi-attribute comprehensive index methods. Ice water bath and subcutaneous injection of adrenaline were both used to establish the acute blood stasis rat model...
August 2017: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/29139268/-mineral-composition-analysis-and-hemostatic-effect-of-limonitum-with-different-mineral-genesis
#13
Chao-Ying Wu, Sheng-Jin Liu, Fang Fang, Yu-Hua Wang, Wen-Guo Yang, Yu-Lu Ma, De-Kang Wu
Models were established in mice with warfarin sodium method, and their bleeding time and hemostasis time were measured by tail cutting method and slide method respectively. Rats were administered for 15 consecutive days to measure their recalcification time, plasma viscosity, platelet adhesion rate, platelet aggregation rate and other blood indexes. As compared with the blank group, the bleeding time was prolonged in model groupn(P<0.05). As compared with the model group, the results showed that the positive vitamin K, the leaching type water decoction and the sediment type decoction could significantly shorten the bleeding time (P<0...
August 2017: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/29138834/mechanism-of-free-radical-generation-in-platelets-and-primary-hepatocytes-a-novel-electron-spin-resonance-study
#14
Chiun-Lang Wang, Po-Sheng Yang, Jeng-Ting Tsao, Thanasekaran Jayakumar, Meng-Jiy Wang, Joen-Rong Sheu, Duen-Suey Chou
Oxygen free radicals have been implicated in the pathogenesis of toxic liver injury and are thought to be involved in cardiac dysfunction in the cirrhotic heart. Therefore, direct evidence for the electron spin resonance (ESR) detection of how D‑galactosamine (GalN), an established experimental hepatotoxic substance, induced free radicals formation in platelets and primary hepatocytes is presented in the present study. ESR results demonstrated that GalN induced hydroxyl radicals (OH•) in a resting human platelet suspension; however, radicals were not produced in a cell free Fenton reaction system...
November 14, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29136006/lipopolysaccharide-potentiates-platelet-responses-via-toll-like-receptor-4-stimulated-akt-erk-pla2-signalling
#15
Maria E Lopes Pires, Simon R Clarke, Sisi Marcondes, Jonathan M Gibbins
Lipopolysaccharide (LPS) from the cell envelope of Gram-negative bacteria is a principal cause of the symptoms of sepsis. LPS has been reported to modulate the function of platelets although the underlying mechanisms of LPS action in these cells remain unclear. Platelets express the Toll-like receptor 4 (TLR4) which serves as a receptor for LPS, although the potential role of TLR4 and associated cell signalling in controlling platelet responses to LPS has not been extensively explored. In this study, we therefore investigated the actions of LPS prepared from different strains of Escherichia coli on platelet function, the underlying signalling mechanisms, and the potential role of TLR4 in orchestrating these...
2017: PloS One
https://www.readbyqxmd.com/read/29135309/screening-for-platelet-function-disorders-with-multiplate-and-platelet-function-analyzer
#16
Floor C J I Moenen, Minka J A Vries, Patricia J Nelemans, Katrien J M van Rooy, Jeannique R R A Vranken, Paul W M Verhezen, Rick J H Wetzels, Hugo Ten Cate, Harry C Schouten, Erik A M Beckers, Yvonne M C Henskens
Light transmission aggregation (LTA) is the gold standard for the diagnosis of platelet function disorders (PFDs), but it is time-consuming and limited to specialized laboratories. Whole-blood impedance aggregometry (Multiplate) and platelet function analyzer (PFA) may be used as rapid screening tools to exclude PFDs. The aim of this study is to assess the diagnostic performance of Multiplate and PFA for PFDs, as detected by LTA.Data from preoperative patients, patients referred to the hematologist for bleeding evaluation, and patients with a diagnosed bleeding disorder were used...
November 14, 2017: Platelets
https://www.readbyqxmd.com/read/29135287/molecular-modelling-studies-in-explaining-the-higher-gpvi-antagonistic-activity-of-the-racemic-2-4-methoxyphenylsulfonyl-2-3-4-9-tetrahydro-1h-pyrido-3-4-b-indole-3-carboxamide-than-its-enantiomers
#17
S S Bhunia, A K Saxena
The GPVI receptor on the platelets plays a major role in inhibiting arterial thrombosis with limited risk of bleeding and is considered a potential anti-thrombotic target for arterial thrombosis. In the reported anti-thrombotics, tetrahydropyridoindoles, the title compound was the best inhibitor of the collagen mediated platelet aggregation by antagonizing the platelet receptor GPVI. Interestingly, the racemic title compound showed better antagonism (IC50 racemate = 6.7 μM) than either of its enantiomers (IC50 S enantiomer = 25...
November 14, 2017: SAR and QSAR in Environmental Research
https://www.readbyqxmd.com/read/29133350/extracellular-histones-induce-erythrocyte-fragility-and-anemia
#18
Farzaneh Kordbacheh, Connor H O'Meara, Lucy A Coupland, Patrick M Lelliott, Christopher R Parish
Extracellular histones have been shown to play an important pathogenic role in many diseases, primarily through their cytotoxicity towards nucleated cells and their ability to promote platelet activation with resultant thrombosis and thrombocytopenia. In contrast, little is known about the effect of extracellular histones on erythrocyte function. We demonstrate here that histones promote erythrocyte aggregation, sedimentation and, using a novel in vitro shear stress model, induce erythrocyte fragility and lysis in a concentration dependent manner...
November 13, 2017: Blood
https://www.readbyqxmd.com/read/29132139/study-of-hspb6-insights-into-the-properties-of-the-multifunctional-protective-agent
#19
Fazhao Li, Han Xiao, Fangfang Zhou, Zhiping Hu, Binbin Yang
HSPB6(Heat shock protein B6), is also referred to as P20/HSP20. Unlike other many other members of sHSP(small Heat shock protein) family, which tend to form high-molecular-mass oligomers, in solution, human HSPB6 only forms dimers. However, it still exhibits chaperon-like activity comparable with that of HSPB5. It is expressed ubiquitously, with high and constitutive expression in muscular tissues. sHSPs characteristically function as molecular chaperones and HSPB6 also has a molecular chaperone activity. HSPB6 is up-regulated in response to diverse cellular stress or damage and protect cells from otherwise lethal conditions...
November 13, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29131285/favourable-hypotensive-effect-after-standardised-tomato-extract-treatment-in-hypertensive-subjects-at-high-estimated-cardiovascular-risk-a-randomised-controlled-trial
#20
Beata Krasińska, Angelika Osińska, Aleksandra Krasińska, Maciej Osiński, Piotr Rzymski, Andrzej Tykarski, Zbigniew Krasiński
BACKGROUND: Cardiovascular (CV) diseases remain a leading global cause of death. Lowering blood pressure (BP) reduces the risk of CV complications, especially stroke and acute coronary events, and it delays the progression of kidney disease. Adequate non-pharmacological treatment improves the effectiveness of the antihypertensive therapy. A Mediterranean diet with high content of vegetables (rich in tomatoes) is associated with a reduced CV risk. AIM: The main objective of the present study was to assess if the addition of standardised extract of tomato (STE) or acetylsalicylic acid (ASA) to standard antihypertensive therapy can improve blood pressure control in patients with hypertension (HT)...
November 13, 2017: Kardiologia Polska
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