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arterial vasodilators

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https://www.readbyqxmd.com/read/28214688/h2s-causes-contraction-and-relaxation-of-major-arteries-of-the-rabbit
#1
Martin Caprnda, Tawar Qaradakhi, Joanne L Hart, Nazarii Kobyliak, Radka Opatrilova, Peter Kruzliak, Anthony Zulli
OBJECTIVE: Cardiovascular disease (CVD) caused by atherosclerosis remains a worldwide burden. Hydrogen sulfide is a promising new therapeutic avenue for the treatment of CVD, however reports show exogenous H2S has both vasodilator and vasoconstrictor effects depending on organ examined, and in vitro studies in animal models which are not resistant to developing atherosclerosis are limited. We sought to determine if rabbit arteries constricted or dilated to hydrogen sulfide. MATERIAL AND METHODS: The aorta, carotid, renal and iliac arteries were harvested from New Zealand White rabbits (n=4) and subjected to a concentration response curve to the fast H2S releaser NaHS...
February 16, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28213406/mitochondria-regulated-formation-of-endothelial-extracellular-vesicles-shifts-the-mediator-of-flow-induced-vasodilation
#2
Julie K Freed, Matthew J Durand, Brian Robert Hoffmann, John C Densmore, Andrew S Greene, David D Gutterman
In order to examine the effect of endothelial-derived extracellular vesicles (eEVs) on the mechanism of flow-induced dilation (FID) composition, formation, and functional effects on the mechanism of FID were examined from two different eEV subtypes, one produced from ceramide, the other from plasminogen-activator inhibitor 1 (PAI-1). Using videomicroscopy, internal diameter changes in response to increases in flow were measured in human adipose resistance arteries acutely exposed (30min) to eEVs derived from cultured endothelial cells exposed to ceramide or PAI-1...
February 17, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/28212823/cyp-epoxygenase-derived-h2o2-is-involved-in-the-endothelium-derived-hyperpolarization-edh-and-relaxation-of-intrarenal-arteries
#3
Mercedes Muñoz, Maria Elvira López-Oliva, Estéfano Pinilla, María Pilar Martínez, Ana Sánchez, Claudia Rodríguez, Albino García-Sacristán, Medardo Hernández, Luis Rivera, Dolores Prieto
Reactive oxygen species (ROS) like hydrogen peroxide (H2O2) are involved in the in endothelium-derived hyperpolarization (EDH)-type relaxant responses of coronary and mesenteric arterioles. The role of ROS in kidney vascular function has mainly been investigated in the context of harmful ROS generation associated to kidney disease. The present study was sought to investigate whether H2O2 is involved in the endothelium-dependent relaxations of intrarenal arteries as well the possible endothelial sources of ROS generation involved in these responses...
February 14, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28208647/soy-leaf-extract-exerts-atheroprotective-effects-via-modulation-of-kr%C3%A3-ppel-like-factor-2-and-adhesion-molecules
#4
Jong-Min Han, Hua Li, Moon-Hee Cho, Seung-Hwa Baek, Chul-Ho Lee, Ho-Yong Park, Tae-Sook Jeong
Soy-leaf extracts exert their cardioprotective effects by inducing endothelium-dependent vasodilation in the arteries, and they favorably modulate the serum lipid profile. In this study, we investigated the atheroprotective effects of an ethanol extract of soy leaf (ESL) in human umbilical vein endothelial cells (HUVECs) and high-cholesterol diet (HCD)-fed low-density lipoprotein receptor deficient (LDLR-/-) mice. ESL induced the expression of Krüppel-like factor 2 (KLF2), an endothelial transcription factor, and endothelial nitric oxide synthase (eNOS), and suppressed the expression of vascular cell adhesion molecule-1 (VCAM-1) and intercellular adhesion molecule-1 (ICAM-1) through moderate inflammatory signal activation, not only in tumor necrosis factor-α (TNF-α)-stimulated HUVECs but also in 7-ketocholesterol (7-KC)-stimulated HUVECs...
February 10, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28202869/treatment-of-vasodilator-resistant-mixed-connective-tissue-disease-associated-pulmonary-arterial-hypertension-with-glucocorticoid-and-cyclophosphamide
#5
Eri Sugawara, Masaru Kato, Ryo Hisada, Kenji Oku, Toshiyuki Bohgaki, Tetsuya Horita, Shinsuke Yasuda, Tatsuya Atsumi
Pulmonary arterial hypertension (PAH) associated with systemic lupus erythematosus (SLE) or mixed connective tissue disease (MTCD), in contrast to other types of PAH, may respond to immunosuppressive therapy. Most PAH cases with an immunosuppressant response were in the early stages of the disease (WHO functional class III or less). The present case was a 34-year-old woman with MCTD-associated PAH (WHO functional class IV) who was resistant to a combination of three vasodilators. Afterwards, she was treated with glucocorticoid and cyclophosphamide...
2017: Internal Medicine
https://www.readbyqxmd.com/read/28194919/management-of-pulmonary-vasodilator-therapy-in-three-pregnancies-with-pulmonary-arterial-hypertension
#6
Atsushi Daimon, Chizuko A Kamiya, Naoko Iwanaga, Tomoaki Ikeda, Norifumi Nakanishi, Jun Yoshimatsu
Pregnancy with pulmonary arterial hypertension (PAH) has a significantly high risk of maternal death and women with PAH are basically advised to avoid pregnancy. Recently, several reports have described pregnant women with PAH who were treated with pulmonary vasodilators during pregnancy and delivered safely. However, the efficacy of this treatment during pregnancy is still not clear. Here we report on the short-term outcomes of three primiparous women with PAH who were prescribed pulmonary vasodilator therapy during their pregnancies...
February 14, 2017: Journal of Obstetrics and Gynaecology Research
https://www.readbyqxmd.com/read/28192258/binding-and-functional-pharmacological-characteristics-of-gepant-type-antagonists-in-rat-brain-and-mesenteric-arteries
#7
Majid Sheykhzade, Nilofar Amandi, Monica Vidal Pla, Bahareh Abdolalizadeh, Anette Sams, Karin Warfvinge, Lars Edvinsson, Darryl S Pickering
AIM: The neuropeptide calcitonin gene-related peptide (CGRP) is found in afferent sensory nerve fibers innervating the resistance arteries and plays a pivotal role in a number of neurovascular diseases such as migraine and subarachnoid bleedings. The present study investigates the binding and antagonistic characteristics of small non-peptide CGRP receptor antagonists (i.e. gepants) in isolated rat brain and mesenteric resistance arteries. METHODS: The antagonistic behavior of gepants was investigated in isolated rat mesenteric arteries using a wire myograph setup while binding of gepants to CGRP receptors was investigated in rat brain membranes using a radioligand competitive binding assay...
February 10, 2017: Vascular Pharmacology
https://www.readbyqxmd.com/read/28192231/hypotensive-and-vasorelaxant-effect-of-diapocynin-in-normotensive-rats
#8
Simone R Potje, Jéssica A Troiano, Murilo E Graton, Valdecir F Ximenes, Ana Claúdia M S Nakamune, Cristina Antoniali
Nicotinamide adenine dinucleotide phosphate oxidase (NAD(P)H-oxidase) is a multicomponent enzyme system that generates superoxide anion by one-electron reduction of molecular oxygen and represents the major source of reactive oxygen species (ROS) in the vascular cells. Apocynin has been extensively used as an inhibitor of NADPH oxidase (NOX) in phagocytic cells and as an antioxidant in non-phagocytic cells. In phagocytes cells, due to the presence of myeloperoxidase, apocynin can be the converted to diapocynin, which is supposed to be the active form of this phytochemical...
February 9, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28192151/angiotensin-1-7-dependent-vasorelaxation-of-the-renal-artery-exhibits-unique-angiotensin-and-bradykinin-receptor-selectivity
#9
Mariam H M Yousif, Ibrahim F Benter, Debra I Diz, Mark C Chappell
Angiotensin-(1-7) [Ang-(1-7)] exhibits blood pressure lowering actions, inhibits cell growth, and reduces tissue inflammation and fibrosis which may functionally antagonize an activated Ang II-AT1 receptor axis. Since the vascular actions of Ang-(1-7) and the associated receptor/signaling pathways varies in different vascular beds, the current study established the vasorelaxant properties of the heptapeptide in the renal artery of male Wistar male rats. Ang-(1-7) produced an endothelium-dependent vasodilator relaxation of isolated renal artery segments pre-contracted by a sub-maximal concentration of phenylephrine (PE) (10(-7)M)...
February 9, 2017: Peptides
https://www.readbyqxmd.com/read/28191874/instantaneous-wave-free-ratio-to-guide-coronary-revascularization-physiological-framework-validation-and-differences-with-fractional-flow-reserve
#10
Guus A de Waard, Carlo Di Mario, Amir Lerman, Patrick W Serruys, Niels van Royen
Determining the optimal treatment strategy for revascularization of coronary artery stenosis involves the use of fractional flow reserve (FFR). To improve the low clinical uptake of physiological lesion assessment to guide revascularization, the instantaneous wave-free period (iFR) was proposed as a simpler alternative to FFR that does not require adenosine administration. iFR is calculated as the ratio of blood pressure distal and proximal to a coronary artery stenosis during the diastolic wave- free period...
February 14, 2017: EuroIntervention
https://www.readbyqxmd.com/read/28190469/proanthocyanidins-from-vitis-vinifera-inhibit-oxidative-stress-induced-vascular-impairment-in-pulmonary-arteries-from-diabetic-rats
#11
Christian Pinna, Paolo Morazzoni, Angelo Sala
BACKGROUND: Vitis vinifera L. (grape seed extract) is a natural source of proanthocyanidins with antioxidant and free radical-scavenging activities. HYPOTHESIS: Grape seed extract supplementation may prevent vascular endothelium impairment associated with diabetes mellitus in rat pulmonary artery. STUDY DESIGN: We evaluated endothelial function of rat pulmonary artery ex-vivo at the intermediate stage (4 weeks) of streptozotocin (STZ)-induced diabetes mellitus...
February 15, 2017: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
https://www.readbyqxmd.com/read/28188813/glutathione-metabolic-status-in-the-aged-rabbit-aorta
#12
Domenico Lapenna, Giuliano Ciofani, Maria Adele Giamberardino
It is not known whether aging alters glutathione metabolic status of the mammalian arterial tissue favoring vascular oxidative stress and dysfunction. Thus we assessed total, reduced and oxidized glutathione (TG, GSH and GSSG, respectively), the glutathione redox ratio (GRR, namely [GSSG]/[GSH+2GSSG]×100), and the activities of the glutathione status-regulating enzymes glutathione reductase (GSSG-Red), γ-glutamylcysteine synthetase (γ-GCS) and γ-glutamyl transpeptidase (γ-GT) in the aortic tissue of 9 young adult control rabbits (YACR, about 4months old) and 9 aged rabbits (AR, about 4...
February 8, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28186430/cerebral-blood-flow-frontal-lobe-oxygenation-and-intra-arterial-blood-pressure-during-sprint-exercise-in-normoxia-and-severe-acute-hypoxia-in-humans
#13
David Curtelin, David Morales-Alamo, Rafael Torres-Peralta, Peter Rasmussen, Marcos Martin-Rincon, Mario Perez-Valera, Christoph Siebenmann, Ismael Pérez-Suárez, Evgenia Cherouveim, A William Sheel, Carsten Lundby, José Al Calbet
Cerebral blood flow (CBF) is regulated to secure brain O2 delivery while simultaneously avoiding hyperperfusion; however, both requisites may conflict during sprint exercise. To determine whether brain O2 delivery or CBF is prioritized, young men performed sprint exercise in normoxia and hypoxia (PIO2 = 73 mmHg). During the sprints, cardiac output increased to ∼22 L min(-1), mean arterial pressure to ∼131 mmHg and peak systolic blood pressure ranged between 200 and 304 mmHg. Middle-cerebral artery velocity (MCAv) increased to peak values (∼16%) after 7...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/28185800/inhaled-sildenafil-as-an-alternative-to-oral-sildenafil-in-the-treatment-of-pulmonary-arterial-hypertension-pah
#14
Jahidur Rashid, Brijeshkumar Patel, Eva Nozik-Grayck, Ivan F McMurtry, Kurt R Stenmark, Fakhrul Ahsan
The practice of treating PAH patients with oral or intravenous sildenafil suffers from the limitations of short dosing intervals, peripheral vasodilation, unwanted side effects, and restricted use in pediatric patients. In this study, we sought to test the hypothesis that inhalable poly(lactic-co-glycolic acid) (PLGA) particles of sildenafil prolong the release of the drug,produce pulmonary specific vasodilation, reduce the systemic exposure of the drug, and may be used as an alternative to oral sildenafil in the treatment of PAH...
February 6, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28185531/endothelial-dysfunction-in-normoglycaemic-first-degree-relatives-of-type-2-diabetes-mellitus-complicated-with-hyperuricaemia
#15
Junxia Zhang, Lin Xiang, Bilin Zhang, Yangyang Cheng
OBJECTIVE: To reveal the effect of hyperuricaemia on endothelial function in normoglycaemic first-degree relatives of type 2 diabetes mellitus. METHODS: In all, 40 first-degree relatives of type 2 diabetes mellitus with hyperuricaemia, 40 first-degree relatives of type 2 diabetes mellitus with normouricaemia and 35 healthy subjects without diabetic family history were recruited in this study. Anthropometric parameters as well as blood pressure, blood lipids, fasting blood glucose, fasting insulin, C-reactive protein, tumour necrosis factor-α and interleukin-6 were measured...
March 2017: Diabetes & Vascular Disease Research
https://www.readbyqxmd.com/read/28183819/a-chronic-physical-activity-treatment-in-obese-rats-normalizes-the-contributions-of-et-1-and-no-to-insulin-mediated-posterior-cerebral-artery-vasodilation
#16
T Dylan Olver, Matthew W McDonald, Diana Klakotskaia, Rachel A Richardson, Jeffrey L Jasperse, C W James Melling, Todd R Schachtman, Hsiao T Yang, Craig A Emter, M Harold Laughlin
This study tested the hypotheses that obesity-induced decrements in insulin-stimulated cerebrovascular vasodilation would be normalized with acute endothelin-1a receptor antagonism, and treatment with a physical activity intervention restores vasoreactivity to insulin through augmented nitric oxide synthase (NOS)-dependent dilation. Otsuka Long-Evans Tokushima Fatty rats were divided into the following groups; 20-wk old food-controlled (CON-20); 20-wk old free-food access (model of obesity, OB-20); 40-wk old food-controlled (CON-40); 40-wk old free-food access (OB-40); and 40-wk old free-food access+RUN (RUN-40; wheel-running access from 20-40 wk)...
February 9, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28182034/topical-vasodilator-response-in-skeletonized-internal-mammary-artery-is-there-really-a-difference
#17
Syed Raza Shah, Syed Arbab Shah, Muhammad Ahmed Jangda, Mohammad Danial Yaqub, Ayesha Altaf Jangda, Maham Khan, Muhammad Asim Khan, Brian Tomkins
AIM OF THE STUDY: Coronary artery bypass graft surgery is the gold standard for the treatment of multivessel and left main coronary artery disease. However, there is considerable debate that whether left internal mammary artery (IMA) should be taken as pedicled or skeletonized. This study was conducted to assess the difference in blood flow after the application of topical vasodilator in skeletonized and pedicled IMA. MATERIALS AND METHODS: In this study, each patient underwent either skeletonized (n = 25) or pedicled IMA harvesting (n = 25)...
January 2017: Avicenna Journal of Medicine
https://www.readbyqxmd.com/read/28180006/effects-of-amniotic-epithelial-cell-transplantation-in-endothelial-injury
#18
REVIEW
Gabriella Vácz, Attila Cselenyák, Zsuzsanna Cserép, Rita Benkő, Endre Kovács, Eszter Pankotai, Andrea Lindenmair, Susanne Wolbank, Charlotte M Schwarz, Dénes B Horváthy, Levente Kiss, István Hornyák, Zsombor Lacza
PURPOSE: Human amniotic epithelial cells (hAECs) are promising tools for endothelial repair in vascular regenerative medicine. We hypothesized that these epithelial cells are capable of repairing the damaged endothelial layer following balloon injury of the carotid artery in adult male rats. RESULTS: Two days after injury, the transplanted hAECs were observed at the luminal side of the arterial wall. Then, 4 weeks after the injury, significant intimal thickening was observed in both untreated and cell implanted vessels...
December 2016: Interventional Medicine & Applied Science
https://www.readbyqxmd.com/read/28178055/pulmonary-hypertension-in-pregnancy-a-report-of-49-cases-at-four-tertiary-north-american-sites
#19
Marie-Louise Meng, Ruth Landau, Olof Viktorsdottir, Jennifer Banayan, Tamila Grant, Brian Bateman, Richard Smiley, Elena Reitman
OBJECTIVE: To identify whether pregnancy outcomes vary by etiology and severity of pulmonary hypertension and whether contemporary therapies influence outcomes. METHODS: A retrospective review of medical records at four academic institutions was conducted to identify pregnant women with pulmonary hypertension (2001-2015). International Classification of Diseases, 9th Revision codes for pulmonary hypertension and pregnancy were used to identify potential participants...
February 6, 2017: Obstetrics and Gynecology
https://www.readbyqxmd.com/read/28177653/prognostic-value-of-stress-dynamic-myocardial-perfusion-ct-in-a-multicenter-population-with-known-or-suspected-coronary-artery-disease
#20
Felix G Meinel, Francesca Pugliese, U Joseph Schoepf, Ullrich Ebersberger, Julian L Wichmann, Gladys G Lo, Yeon Hyeon Choe, Yining Wang, Sabrina Segreto, Fabian Bamberg, Carlo N De Cecco
OBJECTIVE: The purpose of this study was to determine the prognostic value of myocardial perfusion CT for major adverse cardiac events (MACE). MATERIALS AND METHODS: Data from six centers in Asia, Europe, and North America on 144 patients with known or suspected coronary artery disease who had undergone coronary CT angiography (CCTA) and dynamic myocardial perfusion CT with a dual-source CT system were analyzed. CCTA studies were acquired at rest. Dynamic myocardial perfusion CT was performed under vasodilator stress...
February 8, 2017: AJR. American Journal of Roentgenology
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