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https://www.readbyqxmd.com/read/29221961/prevalence-of-high-on-treatment-aspirin-and-clopidogrel-platelet-reactivity-in-patients-with-critical-limb-ischemia
#1
Leonardo C Clavijo, Noor Al-Asady, Ashwat Dhillon, Ray V Matthews, Jorge Caro, Han Tun, Vincent Rowe, David M Shavelle
OBJECTIVES: The goal of this study is to establish the prevalence of high on-treatment platelet reactivity to aspirin (HPRA) and clopidogrel (HPRC) in patients with critical limb ischemia (CLI). BACKGROUND: CLI is associated with an increased risk of death and cardiovascular events. Unlike other patient populations with atherosclerotic cardiovascular disease, previous studies failed to demonstrate a benefit of antiplatelet therapy in patients with CLI. METHODS: From June 2014 to November 2016, we performed platelet reactivity studies for P2Y12 and thromboxane A2 (TXA2) inhibition in 100 CLI patients receiving daily treatment with aspirin and clopidogrel...
October 28, 2017: Cardiovascular Revascularization Medicine: Including Molecular Interventions
https://www.readbyqxmd.com/read/29216624/sildenafil-viagra%C3%A2-prevents-cox-1-txa2-pathway-mediated-vascular-hypercontractility-in-apoe-mice
#2
Marcos A S Leal, Ananda T Dias, Marcella L Porto, Bruna F Brun, Agata L Gava, Silvana S Meyrelles, José Gil-Longo, Manuel Campos-Toimil, Thiago M C Pereira, Elisardo C Vasquez
BACKGROUND/AIMS: The atherosclerotic apolipoprotein E-deficient (apoE-/-) mouse exhibits impaired vasodilation and enhanced vasoconstriction responsiveness. The objectives of this study were: a) to determine the relative contribution of cyclooxygenases (Cox-1 and Cox-2), thromboxane A2 (TXA2) and endothelin-1 (ET-1) to enhancing vascular hyperresponsiveness in this model of atherosclerosis and b) to investigate the beneficial effects of the phosphodiesterase 5 inhibitor sildenafil on this endothelial dysfunction...
December 7, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29200735/therapeutic-effects-of-cyathula-officinalis-kuan-and-its-active-fraction-on-acute-blood-stasis-rat-model-and-identification-constituents-by-hplc-qtof-ms-ms
#3
Yanmei Cao, Cuicui Gu, Fangli Zhao, Yuanlin Tang, Xiaobing Cui, Le Shi, Li Xu, Lian Yin
Background: Cyathula officinalis Kuan is widely used in the clinics for the treatment of blood stasis in China. Objective: To evaluate the improving blood rheology and anti-inflammatory properties of C. officinalis Kuan extract (CO) and its active fraction (ACO) on acute blood stasis model Wistar rats and characterize the correlative constituents. Materials and Methods: CO at 0.26, 0.53, and 1.04 g/kg and ACO at 0.38, 0.75, and 1.5 g/kg were administered to acute blood stasis model Wistar rats for 3 days...
October 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/29180071/role-of-thromboxane-a2-signaling-in-endothelium-dependent-contractions-of-arteries
#4
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/29157825/1-6-di-o-caffeoyl-%C3%AE-d-glucopyranoside-a-natural-compound-from-callicarpa-nudiflora-hook-impairs-p2y12-and-thromboxane-a2-receptor-mediated-amplification-of-platelet-activation-and-aggregation
#5
Jianjiang Fu, Xiaocui Zhu, Wei Wang, Hong Lu, Zhoumiao Zhang, Ting Liu, Huanjun Xu, Huizheng Fu, Shuangcheng Ma, Yuehua Luo
BACKGROUND: Platelet activation and subsequent accumulation at sites of vascular injury perform a central role in thrombus formation, which is believed to be the trigger of several cardiovascular diseases, such as atherosclerosis, myocardial infarction and strokes. In this sense, the search for agents that are capable of blocking platelets aggregation has important implications for these diseases. Callicarpa nudiflora (C. nudiflora) Hook is a traditional Chinese medicine herb for eliminating stasis to subdue swelling and hemostasis...
December 1, 2017: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
https://www.readbyqxmd.com/read/29155368/urinary-11-dehydro-thromboxane-b2-levels-are-associated-with-vascular-inflammation-and-prognosis-in-atherosclerotic-cardiovascular-disease
#6
Nan Wang, Kimberly C Vendrov, Brian P Simmons, Robert N Schuck, George A Stouffer, Craig R Lee
Cyclooxygenase-derived thromboxane (TxA2) and prostacyclin (PGI2) regulate atherogenesis in preclinical models. However, the relationship between TxA2 and PGI2 biosynthesis, vascular inflammation, and atherosclerotic cardiovascular disease (ASCVD) progression in humans remains unclear. The association between stable urine metabolites of thromboxane (TxA2-M) and prostacyclin (PGI2-M), circulating levels of cellular adhesion molecules (CAMs: E-selectin, P-selectin), chemokines and C-reactive protein, and the incidence of major adverse cardiovascular events (MACE) were evaluated in 120 patients with stable ASCVD on aspirin therapy...
November 16, 2017: Prostaglandins & Other Lipid Mediators
https://www.readbyqxmd.com/read/29136266/prostanoids-and-hair-follicles-implications-for-therapy-of-hair-disorders
#7
Xue-Gang Xu, Hong-Duo Chen
Prostanoids, including prostaglandins (PGs) and thromboxane A2 (TXA2), are a family of lipid-derived autacoids that modulate many physiological systems and pathological contexts. Prostanoids are generated by sequential metabolism of arachidonic acid, catalysed by cyclo-oxygenase, to PGH2, which is then converted to PGD2, PGE2, PGF2α, PGI2 and TXA2, catalysed by their specific synthases. Recent evidence suggests that prostanoids play a role in regulating hair growth. The PGF2α analogue is Food and Drug Administration-approved and routinely used to enhance the growth of human eyelashes...
November 14, 2017: Acta Dermato-venereologica
https://www.readbyqxmd.com/read/29136006/lipopolysaccharide-potentiates-platelet-responses-via-toll-like-receptor-4-stimulated-akt-erk-pla2-signalling
#8
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/29090616/mouse-podoplanin-supports-adhesion-and-aggregation-of-platelets-under-arterial-shear-a-novel-mechanism-of-haemostasis
#9
Stephanie E Lombard, Alice Y Pollitt, Craig E Hughes, Ying Di, Tom Mckinnon, Chris A O'callaghan, Steve P Watson
The podoplanin-CLEC-2 axis is critical in mice for prevention of hemorrhage in the cerebral vasculature during mid-gestation. This raises the question as to how platelets are captured by podoplanin on neuroepithelial cells in a high shear environment. In this study, we demonstrate that mouse platelets form stable aggregates on mouse podoplanin at arterial shear through a CLEC-2 and Src kinase-dependent pathway. Adhesion and aggregation are also dependent on the platelet glycoprotein (GP) receptors, integrin αIIbβ3 and GPIb, and the feedback agonists ADP and thromboxane A2 (TxA2)...
November 1, 2017: Platelets
https://www.readbyqxmd.com/read/29076977/multiple-actions-of-phencyclidine-and-mk-801-on-isolated-bovine-cerebral-arteries
#10
Woodrow W Wendling, Dong Chen, Karen S Wendling, Ihab R Kamel
This study examines the direct effects of 3 noncompetitive N-methyl-D-aspartate receptor antagonists, phencyclidine (PCP), (+)MK-801, and (-)MK-801, on bovine middle cerebral arteries (BMCA). Rings of BMCA were mounted in isolated tissue chambers equipped with isometric tension transducers to obtain pharmacologic dose-response curves. In the absence of endogenous vasoconstrictors, the 3 N-methyl-D-aspartate antagonists each produced direct constriction of BMCA. The thromboxane A2 receptor antagonist SQ-29,548, the TxA2 synthase inhibitor furegrelate, the calcium antagonist nimodipine, and calcium-deficient media all inhibited maximal phencyclidine or (+)MK-801-induced constriction...
October 25, 2017: Journal of Neurosurgical Anesthesiology
https://www.readbyqxmd.com/read/29066405/effects-of-danhong-injection-on-platelet-aggregation-in-hyperlipidemia-rats
#11
Hongjing Fan, Min Li, Li Yu, Weifeng Jin, Jiehong Yang, Yuyan Zhang, Haitong Wan
ETHNOPHARMACOLOGICAL RELEVANCE: Danhong Injection (DHI), a Chinese medical product extracted from Radix et Rhizoma Salviae Miltiorrhizae (Salvia miltiorrhiza Bge., Labiatae, Danshen in Chinese) and Flos Carthami (Carthamus tinctorius L., Compositae, Honghua in Chinese), has been reported to have effects on inflammatory, anti-fibrinolytic properties, antithrombotic and decrease blood-lipid. It is extensively used for the clinical treatment of cardiovascular disease. This study aimed to investigate the effects of DHI on blood-lipid levels and platelet aggregation rate in hyperlipidemia rats...
October 21, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/29042013/inhibition-of-microsomal-prostaglandin-e-synthase-1-mpges-1-selectively-suppresses-pge2-in-an-in-vitro-equine-inflammation-model
#12
Emily M Martin, Samuel L Jones
Inhibition of prostaglandin E2 (PGE2) production effectively limits inflammation in horses, however nonspecific prostaglandin blockade via cyclooxygenase (COX) inhibition elicits deleterious gastrointestinal side effects in equine patients. Thus, more selective PGE2 targeting therapeutics are needed to treat inflammatory disease in horses. One potential target is microsomal prostaglandin E-synthase-1 (mPGES-1), which is the terminal enzyme downstream of COX-2 in the inducible PGE2 synthesis cascade. This enzyme has yet to be studied in equine leukocytes, which play a pivotal role in equine inflammatory disease...
October 2017: Veterinary Immunology and Immunopathology
https://www.readbyqxmd.com/read/28991105/low-dose-aspirin-inhibits-cardiac-sympathetic-activation-and-vagal-withdrawal-response-to-morning-rising
#13
Tomiya Yasumasu, Kazuo Takahara, Yutaka Otsuji
Aspirin is known to interfere with platelet function and can protect individuals at risk of sudden death. However, this property of aspirin is less defined for cardiac autonomic activity. We assessed pulse rate variability by spectral analysis and measured plasma eicosanoid levels before and after administration of 81-mg aspirin to 12 healthy subjects over a 60-degree head-up tilt test in the morning. In upright posture, low-dose aspirin decreased both the normalized unit value of low-frequency (normalized LF) power (mean ± SD, 82...
October 2017: Journal of Cardiovascular Pharmacology
https://www.readbyqxmd.com/read/28969559/genetic-signatures-in-ischemic-stroke-focus-on-aspirin-resistance
#14
Anjana Munshi, Kanika Vasudeva, Pratibha Chaurasia, Sulena Singh
Stroke is one of the leading causes of death. There has been compelling evidence that stroke has a genetic component. Genetic variants not only influence susceptibility to stroke but have also been found to alter the response to pharmacological agents and influence the clinical outcome of the disease. Stroke patients are treated with antiplatelet drugs like aspirin and clopidogrel to prevent a secondary stroke. Inspite the fact that many new antiplatelet drugs have been developed; aspirin is still considered as a golden standard for the antiplatelet therapy...
October 2, 2017: CNS & Neurological Disorders Drug Targets
https://www.readbyqxmd.com/read/28948741/-anti-platelet-adhesive-effect-and-mechanisms-of-xueshuantong-capsules-under-flow-conditions
#15
Shu-Xian Han, Ying Chen, Qian Zhang, Bing Han, Yi-Meng Ge, Yan-Hua Xiang, Fu-Long Liao, Yun You
To investigate the anti-platelet adhesive effect and possible mechanisms of Xueshuantong capsule (XST) under flow conditions. Human umbilical vein endothelial cells (HUVECs) and human platelets were employed as experimental materials, and TNF-α (20 μg•L⁻¹) was used to establish vascular endothelial cell injury models. In vivo flow conditions were simulated under controlled shear stress of 0.1 Pa and 0.9 Pa by Bioflux1000 assays accordingly. Anti-platelet adhesive effects of XST at 0.3 g•L⁻¹ were dynamically monitored by microscopic time-lapse photography...
January 2017: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/28925467/effects-of-rosuvastatin-on-pentraxin-3-level-and-platelet-aggregation-rate-in-elderly-patients-with-acute-myocardial-infarction-undergoing-elective-interventional-therapy-a-double-blind-controlled-study
#16
Y-H Li, L-H Wang, Q Li, D-W Yu, Y-S Gai, S-X Cai, F Tian, H-Y Zhou
OBJECTIVE: To investigate clinical effects of rosuvastatin on blood lipid levels, hemorheological profiles, vascular endothelial function, pentraxin 3 (PTX-3) level, the number of granule membrane glycoprotein (GMP-140) molecules and platelet aggregation rate in elderly patients with acute myocardial infarction (AMI) undergoing elective percutaneous coronary intervention (PCI). PATIENTS AND METHODS: Total of 120 elderly patients admitted with AMI undergoing elective PCI from July 2014 to January 2016 were selected...
August 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/28888922/microrna-20a-participates-in-the-aerobic-exercise-based-prevention-of-coronary-artery-disease-by-targeting-pten
#17
Dongwei Wang, Yi Wang, Juan Ma, Wenping Wang, Bingbing Sun, Tengfei Zheng, Ming Wei, Yangli Sun
BACKGROUND: Exercise can reduce the coronary artery disease (CAD) incidence. MiRNA-20a has been reported to distinctly expressed after sustain physical activity. However, its expression and regulation pattern in CAD model with or without exercise has not been reported. OBJECTIVE: In present study, we aim to investigate regulatory mechanism of miR-20a in exercise-associated reduced-CAD incidence and miR-20a-dependent signaling pathways. METHODS: Eight weeks old male ApoE/LDLR double knock out mice were recruited for this study...
November 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28877347/sex-differences-in-the-role-of-phospholipase-a2-dependent-arachidonic-acid-pathway-in-the-perivascular-adipose-tissue-function-in-pigs
#18
Abdulla A Ahmad, Michael D Randall, Richard E Roberts
KEY POINTS: The fat surrounding blood vessels (perivascular adipose tissue or PVAT) releases vasoactive compounds that regulate vascular smooth muscle tone. There are sex differences in the regulation of vascular tone, but, to date, no study has investigated whether there are sex differences in the regulation of blood vessel tone by PVAT. This study has identified that the cyclooxygenase products thromboxane and PGF2α are released from coronary artery PVAT from pigs. Thromboxane appears to mediate the PVAT-induced contraction in arteries from females, whereas PGF2α appears to mediate the contraction in arteries from males...
November 1, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28780058/endothelial-nitric-oxide-synthase-and-cyclooxygenase-are-activated-by-hydrogen-peroxide-in-renal-hypertensive-rat-aorta
#19
B R Silva, L Pernomian, T D De Paula, M D Grando, L M Bendhack
In this work, we hypothesized that cyclooxygenase (COX) activity can be regulated by nitric oxide (NO) and hydrogen peroxide (H2O2). In the renal hypertension (2K-1C), phenylephrine (PE)-induced contraction was lower than in normotensive (2K) rat aortas. This impaired contraction is due to NO/H2O2- induced vasodilation. We evaluated the effects of H2O2 on the activity of COX and endothelial NO-Synthase (eNOS) in 2K-1C rat aortas stimulated with PE. Responses for PE or H2O2 were evaluated in 2K-1C and 2K rat aortas, without or with inhibitors for COX (Indomethacin) or eNOS (L-NAME)...
November 5, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/28770228/mmp-2-mmp-9-and-timp-4-and-response-to-aspirin-in-diabetic-and-nondiabetic-patients-with-stable-coronary-artery-disease-a-pilot-study
#20
Wiktor Kuliczkowski, Marek Radomski, Mariusz Gąsior, Joanna Urbaniak, Jacek Kaczmarski, Andrzej Mysiak, Marta Negrusz-Kawecka, Iwona Bil-Lula
BACKGROUND: High on-aspirin treatment platelets reactivity (HPR) is a significant problem in long-term secondary prevention of cardiovascular events. We hypothesize that imbalance between platelets MMPs/TIMPs results in cardiovascular disorders. We also explored whether chronically elevated blood glucose affects MMP-2/TIMP-4 release from platelets. MATERIALS AND METHODS: Seventy patients with stable coronary artery disease, supplemented with aspirin, participated in this pilot study...
2017: BioMed Research International
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