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Platelets calcium

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https://www.readbyqxmd.com/read/29131001/atorvastatin-calcium-inhibits-pdgf-%C3%AE-%C3%AE-induced-proliferation-and-migration-of-vsmcs-through-the-g0-g1-cell-cycle-arrest-and-suppression-of-activated-pdgfr%C3%AE-pi3k-akt-signaling-cascade
#1
Shuang Chen, Siyuan Dong, Zhao Li, Xiaofan Guo, Naijin Zhang, Bo Yu, Yingxian Sun
BACKGROUND/AIMS: Abnormal proliferation of vascular smooth muscle cells (VSMCs) is a hallmark of vascular lesions, such as atherosclerosis and restenosis. PDGF-ββ, an isoform of PDGF (platelet-derived growth factor), has been demonstrated to induce proliferation and migration of VSMCs. Atorvastatin calcium, a selective inhibitor of 3-hydroxy-3-methylglutaryl coenzyme A (HMG-CoA) reductase, has favorable protective effects on VSMCs. This study examined the effects of atorvastatin calcium on the proliferation and migration of PDGF-ββ-treated VSMCs, as well as its underlying mechanisms...
November 9, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29126301/coagulation-testing-in-the-core-laboratory
#2
William E Winter, Sherri D Flax, Neil S Harris
Primary hemostasis begins with endothelial injury. VWF, produced by endothelial cells, binds to platelets and links them to subendothelial collagen. Platelet-derived ADP and thromboxane activate non-adhered platelets via their GPIIb/IIIa receptors, allowing these platelets to participate in platelet aggregation. Secondary hemostasis is initiated with the binding of factor VII to extravascular tissue factor (TF). Factors II, VII, IX and X are vitamin K-dependent factors. The role of vitamin K is to assist in the addition of gamma carboxylate groups to glutamic acids in the "GLA" domains of these factors...
November 8, 2017: Laboratory Medicine
https://www.readbyqxmd.com/read/29125132/chitosan-inhibits-platelet-mediated-clot-retraction-increases-platelet-derived-growth-factor-release-and-increases-residence-time-and-bioactivity-of-platelet-rich-plasma-in-vivo
#3
Gabrielle Deprés-Tremblay, Anik Chevrier, Nicolas Tran-Khanh, Monica Nelea, Michael D Buschmann
Platelet-rich plasma (PRP) has been used to treat different orthopedic conditions, however, the clinical benefits of using PRP remain uncertain. Chitosan (CS)-PRP implants have been shown to improve meniscus, rotator cuff and cartilage repair in pre-clinical models. The purpose of this current study was to investigate in vitro and in vivo mechanisms of action of CS-PRP implants. Freeze-dried formulations containing 1% (w/v) CS (80% degree of deacetylation and number average molar mass 38 kDa), 1% (w/v) trehalose as a lyoprotectant and 42...
November 10, 2017: Biomedical Materials
https://www.readbyqxmd.com/read/29105970/effects-of-platelet-rich-plasma-on-biological-activity-and-bone-regeneration-of-brushite-based-calcium-phosphate-cement
#4
Md Lemon Hasan, Mirana Taz, Byong-Taek Lee
In this study, we focused on identifying the effects of platelet-rich plasma (PRP) on bioactivity and bone ingrowths incorporated into brushite cement. We introduced PRP as a series of substitutions with an aqueous citrate-ion solution, and the optimized cement with PRP showed no disintegration of the paste consistency. Incorporating PRP showed that the setting time decreased with the increasing of PRP ratios, although the compressive strength was not significantly changed. We evaluated in vitro degradation and bioactivity with the simulated body fluid test, and the result showed that adding PRP accelerated the carbonated apatite nucleation and markedly improved the surface reactivity of the cement...
November 6, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/29101791/calpain-1-regulates-platelet-function-in-a-humanized-mouse-model-of-sickle-cell-disease
#5
Jennifer O Nwankwo, Thomas Gremmel, Anja J Gerrits, Farha J Mithila, Rod R Warburton, Nicholas S Hill, Yunzhe Lu, Lauren J Richey, Joseph A Jakubowski, Andrew L Frelinger, Athar H Chishti
One of the major contributors to sickle cell disease (SCD) pathobiology is the hemolysis of sickle red blood cells (RBCs), which release free hemoglobin and platelet agonists including adenosine 5'-diphosphate (ADP) into the plasma. While platelet activation/aggregation may promote tissue ischemia and pulmonary hypertension in SCD, modulation of sickle platelet dysfunction remains poorly understood. Calpain-1, a ubiquitous calcium-activated cysteine protease expressed in the hematopoietic cells, mediates aggregation of platelets in healthy mice...
October 26, 2017: Thrombosis Research
https://www.readbyqxmd.com/read/29101437/comparison-of-the-efficacy-of-homologous-and-autologous-platelet-rich-plasma-prp-for-treating-androgenic-alopecia
#6
Bilsev Ince, Mehmet Emin Cem Yildirim, Mehmet Dadaci, Mustafa Cihat Avunduk, Nedim Savaci
BACKGROUND: Androgenetic alopecia (AGA), the most common cause of hair loss in both sexes, accounts for 95% of all cases of hair loss. Although the literature has suggested that both nonactivated (n-PRP) and activated autologous (a-PRP) PRP can be used to treat AGA, we did not find any study investigating the use of homologous PRP (h-PRP) for this purpose. Also, to the best of our knowledge, there are no studies comparing the efficacy of h-PRP, a-PRP, or n-PRP on AGA therapy. OBJECTIVES: The aim of this study was to compare the increase in hair density, average number of platelets, complications, preparation, and duration of application in the treatment of AGA using a-PRP, n-PRP, and h-PRP...
November 3, 2017: Aesthetic Plastic Surgery
https://www.readbyqxmd.com/read/29078099/neuromedin-u-potentiates-adp-and-epinephrine-induced-human-platelet-activation
#7
C Grippi, B Izzi, F Gianfagna, F Noro, E Falcinelli, A Di Pardo, E Amico, M B Donati, G de Gaetano, L Iacoviello, M F Hoylaerts, C Cerletti
Neuromedin U (NmU) is a pleiotropic hypothalamic neuropeptide involved in the gut-brain axis. It acts via both a Gαq/11-coupled receptor (NMUR1) and a Gαi-coupled receptor (NMUR2) in different cell types. Expression of both receptors was reported in platelets, but their significance for NmU signaling remains elusive. We studied the potential effects of NmU on human platelet activation. In platelet-rich plasma (PRP), NmU alone (up to 10μM) did not induce any measurable aggregation, but at nanomolar concentrations, it potentiated platelet aggregation by low (mean 0...
September 29, 2017: Thrombosis Research
https://www.readbyqxmd.com/read/29064632/the-effects-of-platelet-derived-growth-factor-bb-on-human-dental-pulp-stem-cells-mediated-dentin-pulp-complex-regeneration
#8
Maolin Zhang, Fei Jiang, Xiaochen Zhang, Shaoyi Wang, Yuqin Jin, Wenjie Zhang, Xinquan Jiang
Dentin-pulp complex regeneration is a promising alternative treatment for the irreversible pulpitis caused by tooth trauma or dental caries. This process mainly relies on the recruitment of endogenous or the transplanted dental pulp stem cells (DPSCs) to guide dentin-pulp tissue formation. Platelet-derived growth factor (PDGF), a well-known potent mitogenic, angiogenic, and chemoattractive agent, has been widely used in tissue regeneration. However, the mechanisms underlying the therapeutic effects of PDGF on dentin-pulp complex regeneration are still unclear...
October 24, 2017: Stem Cells Translational Medicine
https://www.readbyqxmd.com/read/29052936/a-humanized-monoclonal-antibody-that-inhibits-platelet-surface-erp72-reveals-a-role-for-erp72-in-thrombosis
#9
L Holbrook, G K Sandhar, P Sasikumar, M P Schenk, A R Stainer, K Sahli, G D Flora, A B Bicknell, J M Gibbins
BACKGROUND: Within the endoplasmic reticulum, thiol isomerase enzymes modulate the formation and rearrangement of disulphide bonds in newly folded proteins entering the secretory pathway to ensure correct protein folding. In addition to their intracellular importance, thiol isomerases have been recently identified to be present on the surface of a number of cell types where they are important for cell function. Several thiol isomerases are known to be present on the resting platelet surface including PDI, ERp5 and ERp57 and levels are increased following platelet activation...
October 20, 2017: Journal of Thrombosis and Haemostasis: JTH
https://www.readbyqxmd.com/read/29052380/-action-mechanism-of-total-flavonoids-of-hippophae-rhamnoides-in-treatment-of-myocardial-ischemia-based-on-network-pharmacology
#10
Zhi-Cheng Wei, Dong Tong, Juan Yang, Ke-Hui Zhao, Xian-Li Meng, Yi Zhang
In this study, a network pharmacological screening method was adopted to further study the active ingredients and action mechanism of total flavonoids of Hippophae rhamnoides(TFH) for the treatment of myocardial ischemia. Firstly TCMSP database and PubChem database were searched, and then the data were combined with oral bioavailability and drug analysis to screen flavonoids of H.rhamnoides compounds. Then predictive analysis was conducted for the 7 screened compounds by ChemMapper server.The obtained potential targets were imported into MAS 3...
April 2017: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/29047220/the-cytokines-and-microenvironment-of-fracture-haematoma-current-evidence
#11
REVIEW
Gavin Walters, Ippokratis Pountos, Peter V Giannoudis
BACKGROUND: Fracture haematoma formation is the first and foremost important stage of fracture healing. It orchestrates the inflammatory and cellular processes leading to the formation of callus and the restoration of the continuity of the bone. Evidence suggests that blocking this initial stage could lead to an impairment of the overall bone healing process. This review aims to analyse the existing evidence of molecular contributions to bone healing within fracture haematoma, and to determine the potential to modify the molecular response to fracture in the haematoma with the aim of improving union times...
October 19, 2017: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/29042668/signalling-mechanisms-in-paf-induced-intestinal-failure
#12
Ingmar Lautenschläger, Yuk Lung Wong, Jürgen Sarau, Torsten Goldmann, Karina Zitta, Martin Albrecht, Inéz Frerichs, Norbert Weiler, Stefan Uhlig
Capillary leakage syndrome, vasomotor disturbances and gut atony are common clinical problems in intensive care medicine. Various inflammatory mediators and signalling pathways are involved in these pathophysiological alterations among them platelet-activating factor (PAF). The related signalling mechanisms of the PAF-induced dysfunctions are only poorly understood. Here we used the model of the isolated perfused rat small intestine to analyse the role of calcium (using calcium deprivation, IP-receptor blockade (2-APB)), cAMP (PDE-inhibition plus AC activator), myosin light chain kinase (inhibitor ML-7) and Rho-kinase (inhibitor Y27632) in the following PAF-induced malfunctions: vasoconstriction, capillary and mucosal leakage, oedema formation, malabsorption and atony...
October 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29040496/changes-in-platelet-bax-levels-contribute-to-impaired-platelet-response-to-thrombin-after-cardiopulmonary-bypass-prospective-observational-clinical-and-laboratory-investigations
#13
M Murase, Y Nakayama, D I Sessler, N Mukai, S Ogawa, Y Nakajima
Background: Anucleate platelets can undergo apoptosis in response to various stimuli, as do nucleated cells. Cardiopulmonary bypass (CPB) causes platelet dysfunction and can also activate platelet apoptotic pathways. We therefore evaluated time-dependent changes in blood platelet Bax (a pro-apoptotic molecule) levels and platelet dysfunction after cardiac surgery. Methods: We assessed blood samples obtained from subjects having on-pump or off-pump coronary artery bypass graft surgery (n=20 each)...
October 10, 2017: British Journal of Anaesthesia
https://www.readbyqxmd.com/read/29028628/role-of-pdgf-bb-in-proliferation-differentiation-and-maintaining-stem-cell-properties-of-pdl-cells-in-vitro
#14
Zornitsa Mihaylova, Rozaliya Tsikandelova, Pavel Sanimirov, Natalia Gateva, Vanyo Mitev, Nikolay Ishkitiev
OBJECTIVE: Platelet-derived growth factor-BB (PDGF-BB) is one of the most abundant growth factors in platelet derived products and has been shown to stimulate regeneration after tissue injury. There is a population of mesenchymal stem cells (MSC) in human periodontal ligament (PDL) which can contribute to tissue regeneration under appropriate conditions. DESIGN: PDL cells were isolated and characterized using stem cell and differentiation markers via immunofluorescence and flow cytometry and then cultured in vitro and treated with different concentrations of PDGF-BB...
September 25, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/29026589/a-retrospective-analysis-of-biochemical-and-haematological-parameters-in-patients-with-eating-disorders
#15
Leanne J Barron, Robert F Barron, Jeremy C S Johnson, Ingrid Wagner, Cameron J B Ward, Shannon R B Ward, Faye M Barron, Warren K Ward
BACKGROUND: The objective of the study was to determine whether levels of biochemical and haematological parameters in patients with eating disorders (EDs) varied from the general population. Whilst dietary restrictions can lead to nutritional deficiencies, specific abnormalities may be relevant to the diagnosis, pathogenesis and treatment of EDs. METHODS: With ethics approval and informed consent, a retrospective chart audit was conducted of 113 patients with EDs at a general practice in Brisbane, Australia...
2017: Journal of Eating Disorders
https://www.readbyqxmd.com/read/29021703/ginsenoside-rg3-enriched-red-ginseng-extract-inhibits-platelet-activation-and-in%C3%A2-vivo-thrombus-formation
#16
Dahye Jeong, Muhammad Irfan, Sung-Dae Kim, Suk Kim, Jun-Hwan Oh, Chae-Kyu Park, Hyun-Kyoung Kim, Man Hee Rhee
BACKGROUND: Korean Red Ginseng has been used for several decades to treat many diseases, enhancing both immunity and physical strength. Previous studies have documented the therapeutic effects of ginseng, including its anticancer, antiaging, and anti-inflammatory activities. These activities are mediated by ginsenosides present in the ginseng plant. Ginsenoside Rg3, an effective compound from red ginseng, has been shown to have antiplatelet activity in addition to its anticancer and anti-inflammatory activities...
October 2017: Journal of Ginseng Research
https://www.readbyqxmd.com/read/28990414/biomarkers-of-endothelial-renal-and-platelet-dysfunction-in-stage-5-chronic-kidney-disease-hemodialysis-patients-with-heart-failure
#17
Ryan McMillan, Leonidas Skiadopoulos, Debra Hoppensteadt, Nil Guler, Vinod Bansal, Ravipresenna Parasuraman, Jawed Fareed
The aim of this study was to determine the role of endothelial, renal, and inflammatory biomarkers in the pathogenesis of heart failure (HF) in patients with stage 5 chronic kidney disease (CKD5) undergoing maintenance hemodialysis (HD). Plasma levels of biomarkers-kidney injury molecule 1 (KIM-1), N-terminal pro brain natriuretic peptide (NT-proBNP), glycated hemoglobin, neutrophil gelatinase-associated lipocalin, interleukin-18,platelet-derived growth factor, platelet factor 4 (PF4), 25-OH vitamin D, parathyroid hormone (PTH), endothelin, and endocan-were measured in CKD5-HD patients at the Loyola University Ambulatory Dialysis facility...
January 1, 2017: Clinical and Applied Thrombosis/hemostasis
https://www.readbyqxmd.com/read/28990195/comparative-analyses-of-industrial-scale-human-platelet-lysate-preparations
#18
Jan Pierce, Eric Benedetti, Amber Preslar, Pam Jacobson, Ping Jin, David F Stroncek, Jo-Anna Reems
BACKGROUND: Efforts are underway to eliminate fetal bovine serum from mammalian cell cultures for clinical use. An emerging, viable replacement option for fetal bovine serum is human platelet lysate (PL) as either a plasma-based or serum-based product. STUDY DESIGN AND METHODS: Nine industrial-scale, serum-based PL manufacturing runs (i.e., lots) were performed, consisting of an average ± standard deviation volume of 24.6 ± 2.2 liters of pooled, platelet-rich plasma units that were obtained from apheresis donors...
October 8, 2017: Transfusion
https://www.readbyqxmd.com/read/28987709/impact-of-levosimendan-on-platelet-function
#19
Joanna Sikora, Krzysztof Pstrągowski, Natalia Skibińska, Przemysław Sobczak, Adam Sikora, Michał Piotr Marszałł, Tomasz Fabiszak, Grzegorz Grześk, Jacek Kubica
Levosimendan has been developed for treatment of severe heart failure. The favorable hemodynamic effect of levosimendan is related to its unique dual mechanism of action - increase of the contractile force of the myocardium caused by enhanced sensitivity of myofilaments to calcium combined with vasodilatation caused by the opening of adenosine triphosphate - dependent potassium channels. Due to the structural similarities to phosphodiesterase inhibitors it may partly exert its action via inhibition of phosphodiesterase inhibitors III...
October 2, 2017: Thrombosis Research
https://www.readbyqxmd.com/read/28981200/soluble-fibrin-causes-an-acquired-platelet-glycoprotein-vi-signaling-defect-implications-for-coagulopathy
#20
M Y Lee, C C Verni, B A Herbig, S L Diamond
Essentials Collagen and thrombin when used simultaneously generate highly activated platelets. The effect of thrombin stimulation on subsequent glycoprotein VI (GPVI) function was observed. Soluble fibrin, but not protease activated receptor (PAR) activation, prevented GPVI activation. Circulating soluble fibrin in coagulopathic blood may cause an acquired GPVI signaling defect. SUMMARY: Background In coagulopathic blood, circulating thrombin may drive platelet dysfunction. Methods/Results Using calcium dye-loaded platelets, the effect of thrombin exposure and soluble fibrin generation on subsequent platelet GPVI function was investigated...
October 5, 2017: Journal of Thrombosis and Haemostasis: JTH
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