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https://www.readbyqxmd.com/read/29425800/influence-of-the-selective-cox-2-inhibitor-celecoxib-on-sex-differences-in-blood-pressure-and-albuminuria-in-spontaneously-hypertensive-rats
#1
Ahmed A Elmarakby, Mohamed Katary, Jennifer S Pollock, Jennifer C Sullivan
We previously reported that female spontaneously hypertensive rats (SHR) have greater cyclooxygenase-2 (COX-2) expression in the renal medulla and enhanced urinary excretion of prostaglandin (PG) E2 (PGE2) metabolites compared to male SHR. Based on the role of COX-2-derived prostanoids in the regulation of cardiovascular health, the aim of the current study was to test the hypothesis that blood pressure (BP) in female SHR is more sensitive to COX-2 inhibition than in males. Seven week old male and female SHR were implanted with telemetry transmitters for continuous BP recording...
February 6, 2018: Prostaglandins & Other Lipid Mediators
https://www.readbyqxmd.com/read/29412230/protective-effect-of-dexmedetomidine-against-myocardial-ischemia-reperfusion-injury-in-rabbits
#2
Jianjun Ren, Changfa Li, Yan Liu, Haitao Liu, Zhenming Dong
PURPOSE: To investigate the influence of dexmedetomidine on myocardial ischemia-reperfusion injury (IRI) in rabbits. METHODS: Twenty-four New Zealand white rabbits were randomly divided into two equal-sized groups: IRI group (group IR) and dexmedetomidine group (group D). Systolic blood pressure (SBP), diastolic blood pressure (DBP), heart rate (HR), left ventricular systolic pressure (LVSP), left ventricular end-diastolic pressure (LVEDP), left ventricular diastolic pressure (LVDP), +dp/dtmax, -dp/dtmax, and t-dp/dtmax were recorded and calculated at the following time points: before (T0) and after (T1) dexmedetomidine infusion, after 30-min ischemia (T2), and after 120-min reperfusion (T3)...
January 2018: Acta Cirúrgica Brasileira
https://www.readbyqxmd.com/read/29399191/effects-of-flurbiprofen-on-serum-level-of-interleukin-6-prostacyclin-and-corticosteroid-a2-in-patients-with-bone-metastases-of-cancer
#3
Yanwei Yin, Yusheng Yi, Junmin Yu, Xiuming Sun, Chuansheng Liu, Fenghe Xu
The present study aimed to investigate the effects of flurbiprofen on serum level of interleukin-6 (IL-6), prostacyclin (PGI2) and corticosteroid A2 (TXA2) in patients with bone metastases of cancer. A total of 210 patients with bone metastasis of cancer were randomly divided into two groups: Flurbiprofen axetil analgesia group (group A) and dezocine analgesia group (group B), 105 cases in each group. The analgesic effect was evaluated using visual analogue scale (VAS) scoring system at 1, 12, 24 and 48 h after treatment...
February 2018: Oncology Letters
https://www.readbyqxmd.com/read/29378362/inhibitory-effects-of-an-orally-active-thromboxane-a2-receptor-antagonist-nstpbp5185-on-atherosclerosis-in-apoe-deficient-mice
#4
Shiu-Wen Huang, Jin-Cherng Lien, Sheng-Chu Kuo, Tur-Fu Huang
Thromboxane A2 (TXA2) activation of TP receptor has been shown contributing to the progression and acute complications of atherosclerosis including endothelial dysfunction, platelet hyperactivity and inflammation. Growing evidence suggests that TP receptor may represent as a therapeutic target in atherosclerosis and related cardiovascular diseases. We investigated whether nstpbp5185, an orally active TP receptor antagonist, exhibits protective effects against atherosclerotic progression. Nstpbp5185 and aspirin were orally administered daily for 12 weeks in high-cholesterol-fed ApoE-deficient mice to examine their anti-atherosclerosis effects...
February 2018: Thrombosis and Haemostasis
https://www.readbyqxmd.com/read/29374184/creating-a-mouse-model-resistant-to-induced-ischemic-stroke-and-cardiovascular-damage
#5
Qing-Lan Ling, Anita J Mohite, Emma Murdoch, Hironari Akasaka, Qun-Ying Li, Shui-Ping So, Ke-He Ruan
Vascular prostanoids, isomerized from an intermediate prostaglandin (PG), H2, produced by cyclooxygenase (COX), exert various effects on the vascular system, both protective and destructive. During endothelial dysfunction, vascular protector prostacyclin/prostaglandin I2 (PGI2) is decreased, while inflammatory PGE2 and thrombotic TXA2 are increased. Therefore, our research aim was to reverse the event by controlling PGH2 metabolism by generating an in vivo model via enzymatic engineering of COX-1 and prostacyclin synthase (PGIS)...
January 26, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29364918/riociguat-versus-sildenafil-on-hypoxic-pulmonary-vasoconstriction-and-ventilation-perfusion-matching
#6
Virginia Chamorro, Daniel Morales-Cano, Javier Milara, Bianca Barreira, Laura Moreno, María Callejo, Gema Mondejar-Parreño, Sergio Esquivel-Ruiz, Julio Cortijo, Ángel Cogolludo, Joan A Barberá, Francisco Perez-Vizcaino
INTRODUCTION: Current treatment with vasodilators for pulmonary hypertension associated with respiratory diseases is limited by their inhibitory effect on hypoxic pulmonary vasoconstriction (HPV) and uncoupling effects on ventilation-perfusion (V'/Q'). Hypoxia is also a well-known modulator of the nitric oxide (NO) pathway, and may therefore differentially affect the responses to phosphodiesterase 5 (PDE5) inhibitors and soluble guanylyl cyclase (sGC) stimulators. So far, the effects of the sGC stimulator riociguat on HPV have been poorly characterized...
2018: PloS One
https://www.readbyqxmd.com/read/29297721/mucor-circinelloides-induces-platelet-aggregation-through-integrin-%C3%AE-iib%C3%AE-3-and-fc%C3%AE-riia
#7
Harlene Ghuman, Alicia Shepherd-Roberts, Stephanie Watson, Malou Zuidscherwoude, Steve P Watson, Kerstin Voelz
Thrombosis is a hallmark of the fatal fungal infection mucormycosis. Yet, the platelet activation pathway in response to mucormycetes is unknown. In this study we determined the platelet aggregation potential of Mucor circinelloides (M. circinelloides) NRRL3631, characterized the signaling pathway facilitating aggregation in response to fungal spores, and identified the influence of the spore developmental stage upon platelet aggregation potential. Using impedance and light-transmission aggregometry, we showed that M...
January 3, 2018: Platelets
https://www.readbyqxmd.com/read/29296928/coordination-of-platelet-agonist-signaling-during-the-hemostatic-response-in-vivo
#8
Jian Shen, Sara Sampietro, Jie Wu, Juan Tang, Shuchi Gupta, Chelsea N Matzko, Chaojun Tang, Ying Yu, Lawrence F Brass, Li Zhu, Timothy J Stalker
The local microenvironment within an evolving hemostatic plug shapes the distribution of soluble platelet agonists, resulting in a gradient of platelet activation. We previously showed that thrombin activity at a site of vascular injury is spatially restricted, resulting in robust activation of a subpopulation of platelets in the hemostatic plug core. In contrast, adenosine 5'-diphosphate (ADP)/P2Y12 signaling contributes to the accumulation of partially activated, loosely packed platelets in a shell overlying the core...
December 26, 2017: Blood Advances
https://www.readbyqxmd.com/read/29258493/antiplatelet-mechanism-of-an-herbal-mixture-prepared-from-the-extracts-of-phyllostachys-pubescens-leaves-and-prunus-mume-fruits
#9
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/29251519/impairment-of-amyloid-precursor-protein-alpha-processing-in-cerebral-microvessels-of-type-1-diabetic-mice
#10
Tongrong He, Ruohan Sun, Anantha Vr Santhanam, Livius V d'Uscio, Tong Lu, Zvonimir S Katusic
The mechanisms underlying dysfunction of cerebral microvasculature induced by type 1 diabetes (T1D) are not fully understood. We hypothesized that in cerebral microvascular endothelium, α-processing of amyloid precursor protein (APP) is impaired by T1D. In cerebral microvessels derived from streptozotocin (STZ)-induced T1D mice protein levels of APP and its α-processing enzyme, a disintegrin and metalloprotease 10 (ADAM10) were significantly decreased, along with down-regulation of adenylate cyclase 3 (AC3) and enhanced production of thromboxane A2 (TXA2)...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/29247478/chinese-medicine-tongxinluo-capsule-alleviates-cerebral-microcirculatory-disturbances-in-ischemic-stroke-by-modulating-vascular-endothelial-function-and-inhibiting-leukocyte-endothelial-cell-interactions-in-mice-a-two-photon-laser-scanning-microscopy-study
#11
Shen Liu, Cong Wei, Ning Kang, Qilong He, Junqing Liang, Hongtao Wang, Liping Chang, Daohong Chen, Qiuyan Zhang, Chengcheng Chang, Junfang Zhang, Hong Ren, Yiling Wu
OBJECTIVE: The aim of this study was to examine the effect of Tongxinluo capsule (TXL), a Chinese medicine prescription, on cerebral microcirculatory disturbances after permanent middle cerebral artery occlusion (pMCAO) in mice using two-photon laser scanning microscopy (TPLSM) and further explore the underlying mechanisms. METHODS: C57BL/6J mice were subjected to pMCAO and orally administered with TXL (3.0, 1.5 and 0.75 g/kg/day) at 1h, 3h and 21h after pMCAO. The following parameters were examined at 6h and 24h after pMCAO: neurological deficit, infarct volume, blood-brain barrier (BBB) permeability, cerebral microvessel structure, brain microcirculation (TPLSM imaging), vasoactive factors and adhesion molecules...
December 15, 2017: Microcirculation: the Official Journal of the Microcirculatory Society, Inc
https://www.readbyqxmd.com/read/29221961/prevalence-of-high-on-treatment-aspirin-and-clopidogrel-platelet-reactivity-in-patients-with-critical-limb-ischemia
#12
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
#13
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...
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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