Abstract:
AIMS:This study examines the effect of endogenous male sex hormones on thromboxane A2 (TXA2), prostaglandin (PG) I2, PGF(2 alpha), and PGE I2 release, as well as their role in acetylcholine (ACh)-mediated relaxation in the aorta. METHODS AND RESULTS:Aortic segments from orchidectomized and control male Sprague-Dawley rats were used to measure COX-2 protein expression. ACh-induced relaxation of these segments was also determined in the absence and presence of the COX-2 inhibitor NS-398, the TXA2 synthesis inhibitor furegrelate, the PGI2 synthesis inhibitor tranylcypromine (TCP), or the thromboxane-prostanoid (TP) receptor antagonist SQ-29 548. Furthermore, TXA2, PGI2, PGF(2 alpha), and PGE2 release as well as the vasomotor effect of exogenous TXA2, PGI2, PGF(2 alpha), and PGE2 were measured. COX-2 expression was increased in aortas from orchidectomized rats. NS-398 did not modify the ACh-induced relaxation in arteries from both control or orchidectomized rats. Furegrelate did not modify the ACh-induced relaxation in aortas from control animals but, in aortas from orchidectomized rats, it increased that response. TCP decreased the ACh-induced relaxation in both groups. The TP receptor antagonist, SQ29 548 failed to modify ACh-induced relaxation in aortas from either rat group. Pre-incubating arteries from orchidectomized rats with TCP plus furegrelate did not modify the decrease in the ACh response induced by TCP alone, but this response was restored by co-incubation of TCP plus SQ29 548. ACh-induced TXA2, PGI2, PGF(2 alpha), and PGE2 release were increased by orchidectomy. The presence of furegrelate plus TCP increased the ACh-induced PGE2 release more in arteries from orchidectomized than in those from control rats. The contractile responses induced by the TXA2 mimetic U-46619 or by exogenous PGF(2 alpha) were similar in arteries from control and orchidectomized rats, while those induced by exogenous PGE2 were increased in arteries from orchidectomized rats; the vasodilator response induced by exogenous PGI2 was decreased in arteries from orchidectomized rats. CONCLUSION:These data show that endogenous male sex hormone deprivation increases COX-2 expression, the release of TXA2, PGI2, PGF(2 alpha), and PGE2 and the contractile response induced by exogenous PGE2 and TXA2, while it decreases the relaxation induced by exogenous PGI2. Despite the predominance of vasoconstrictor prostanoids derived from COX-2 in aortas from orchidectomized rats, the ACh-induced relaxation remains increased.
journal_name
Cardiovasc Resjournal_title
Cardiovascular researchauthors
Martorell A,Blanco-Rivero J,Aras-López R,Sagredo A,Balfagón G,Ferrer Mdoi
10.1093/cvr/cvm059subject
Has Abstractpub_date
2008-02-01 00:00:00pages
590-9issue
3eissn
0008-6363issn
1755-3245pii
cvm059journal_volume
77pub_type
杂志文章abstract:AIMS:Peroxisome proliferator-activated receptors (PPARs) are members of the nuclear receptor superfamily of ligand-activated transcriptional regulators. PPARdelta has an established role in metabolism, wound healing, and angiogenesis. However, little is known about its function in endothelial homeostasis. We investigat...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1093/cvr/cvp365
更新日期:2010-03-01 00:00:00
abstract:OBJECTIVE:Insulin protects cardiomyocytes from apoptosis. Insulin resistance usually refers to a defect in the ability of insulin to stimulate glucose uptake. It is unknown, however, whether or not insulin resistance compromises the cell-protective effect of the hormone. Caspases are a family of cysteine proteases that...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1016/j.cardiores.2007.07.012
更新日期:2007-12-01 00:00:00
abstract:AIMS:Processes in the development of atherosclerotic lesions can lead to plaque rupture or erosion, which can in turn elicit myocardial infarction or ischaemic stroke. The aims of this study were to determine whether Toll-like receptor 7 (TLR7) gene expression levels influence patient outcome and to explore the mechani...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1093/cvr/cvw231
更新日期:2017-01-01 00:00:00
abstract::Stroke, ischaemic stroke and subtypes of ischaemic stroke display substantial heritability. When compared with related vascular conditions, the number of established risk loci reaching genome-wide significance for association with stroke is still in the lower range, particularly for aetiological stroke subtypes such a...
journal_title:Cardiovascular research
pub_type: 杂志文章,评审
doi:10.1093/cvr/cvy068
更新日期:2018-07-15 00:00:00
abstract::Genetic and environmental factors influence the development of coronary artery disease (CAD). Genetic analyses of families and the population continue to yield important fundamental insights for CAD. For the past four decades, CAD human genetic research focused largely on the study of germline genetic variation in CAD...
journal_title:Cardiovascular research
pub_type: 杂志文章,评审
doi:10.1093/cvr/cvz032
更新日期:2019-04-15 00:00:00
abstract::As the developing heart grows and the chamber walls thicken, passive diffusion of oxygen and nutrients is replaced by a vascular plexus which remodels and expands to form a mature coronary vascular system. The coronary arteries and veins ensure the continued development of the heart and facilitate cardiac output with ...
journal_title:Cardiovascular research
pub_type: 杂志文章,评审
doi:10.1093/cvr/cvr035
更新日期:2011-07-15 00:00:00
abstract::The contractile response to beta-adrenoceptor stimulation has been found to be reduced in single myocytes from failing human ventricle. A portion of that reduction was statistically related to the age of the patient. We have developed a method for obtaining viable contracting myocytes from small biopsies of human vent...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:
更新日期:1996-01-01 00:00:00
abstract:AIMS:Shock wave therapy (SWT) represents a clinically widely used angiogenic and thus regenerative approach for the treatment of ischaemic heart or limb disease. Despite promising results in preclinical and clinical trials, the exact mechanism of action remains unknown. Toll-like receptor 3, which is part of the innate...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1093/cvr/cvv272
更新日期:2016-02-01 00:00:00
abstract:OBJECTIVES:Coronary collateral flow often mitigates the effects of coronary artery obstruction and has a significant impact on the prognosis of patients with coronary artery disease. In the presence of variable degrees of coronary collateral flow, digital radiographic assessment of myocardial blood flow has not been qu...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1016/s0008-6363(96)00218-0
更新日期:1997-02-01 00:00:00
abstract:OBJECTIVE:While atrial natriuretic peptide (ANP) has been shown to be released mainly from cardiac muscle cells in response to atrial distension, the regulatory mechanisms of ANP secretion are still not fully understood. We sought to determine whether the ATP-sensitive K+ (K(ATP)) channel modulates the secretion of ANP...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1016/j.cardiores.2005.03.011
更新日期:2005-07-01 00:00:00
abstract::Cardiac hypertrophy occurs in a number of disease states associated with chronic increases in cardiac work load. Although cardiac hypertrophy may initially represent an adaptive response of the myocardium, ultimately, it often progresses to ventricular dilatation and heart failure. Much investigation has focused on th...
journal_title:Cardiovascular research
pub_type: 杂志文章,评审
doi:10.1016/j.cardiores.2004.04.002
更新日期:2004-08-15 00:00:00
abstract::Microelectrode recordings of skin nerve sympathetic activity were made in the median nerve supplying the right hand of nine patients with Raynaud's phenomenon and 10 control subjects. With subjects warmed up (finger temperature 33 to 34 degrees C) different manoeuvres were used to evoke strong, single sympathetic burs...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1093/cvr/19.5.249
更新日期:1985-05-01 00:00:00
abstract:AIMS:Arrhythmias and sudden cardiac death (SCD) occur commonly in patients with heart failure. We found T-box 5 (TBX5) dysregulated in ventricular myocardium from heart failure patients and thus we hypothesized that TBX5 reduction contributes to arrhythmia development in these patients. To understand the underlying mec...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1093/cvr/cvaa239
更新日期:2020-08-10 00:00:00
abstract::Currently, a high carbohydrate/low fat diet is recommended for patients with hypertension; however, the potentially important role that the composition of dietary fat and carbohydrate plays in hypertension and the development of pathological left ventricular hypertrophy (LVH) has not been well characterized. Recent st...
journal_title:Cardiovascular research
pub_type: 杂志文章,评审
doi:10.1016/j.cardiores.2006.11.007
更新日期:2007-01-15 00:00:00
abstract::End-diastolic current thresholds have been measured in 12 open-chested dogs with epicardial disc electrodes ranging in radius from 0.01 to 9.0 mm. The current threshold for cathodal 1 ms impulses proved to be independent of electrode size for radii smaller than 0.2 mm and proportional to the radius to the power 1.5 fo...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1093/cvr/12.8.477
更新日期:1978-08-01 00:00:00
abstract::Numerous epidemiological studies documented an inverse relationship between plasma high-density lipoprotein (HDL) cholesterol levels and the extent of atherosclerotic disease. However, clinical interventions targeting HDL cholesterol failed to show clinical benefits with respect to cardiovascular risk reduction, sugge...
journal_title:Cardiovascular research
pub_type: 杂志文章,评审
doi:10.1093/cvr/cvu136
更新日期:2014-08-01 00:00:00
abstract:OBJECTIVE:We recently showed that mitochondrial coupling factor 6 (CF6) is present as a pressor substance and a prostacyclin inhibitor in systemic circulation. However, the regulation mechanism for circulating CF6 is unknown. We investigated the role of tumor necrosis factor-alpha (TNF-alpha) in the generation and rele...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1016/j.cardiores.2004.01.031
更新日期:2004-06-01 00:00:00
abstract:OBJECTIVE:Cardiac energetics and performance depend on the expression level of the fast (alpha-) and slow (beta-) myosin heavy chain (MHC) isoform. In ventricular tissue, the beta-MHC isoform predominates, whereas in atrial tissue a variable mixture of alpha- and beta-MHC is found. In several cardiac diseases, the slow...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1016/j.cardiores.2004.09.029
更新日期:2005-01-01 00:00:00
abstract:AIMS:Adequate microcirculatory perfusion, and not just opening of occluded arteries, is critical to salvage heart tissue following myocardial infarction. However, the degree of microvascular perfusion taking place is not known, limited primarily by an inability to directly image coronary microcirculation in a beating h...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1093/cvr/cvz118
更新日期:2019-11-01 00:00:00
abstract::Felodipine (4(2,3-dichlorophenyl)-1,4-dihydro-2, 6-dimethyl-3-ethoxycarbonyl-5-methoxycarbonyl pyridine)), a selective vasodilating anti-hypertensive drug, was used in the treatment of spontaneously hypertensive rats (SHRs) and age-matched Wistar-Kyoto rats (WKYs) from age 6 to 14 weeks, ie during the time of high blo...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1093/cvr/19.9.528
更新日期:1985-09-01 00:00:00
abstract::Congenital coronary artery anomalies are of major significance in clinical cardiology and cardiac surgery due to their association with myocardial ischaemia and sudden death. Such anomalies are detectable by imaging modalities and, according to various definitions, their prevalence ranges from 0.21 to 5.79%. This cons...
journal_title:Cardiovascular research
pub_type: 杂志文章,评审
doi:10.1093/cvr/cvv251
更新日期:2016-02-01 00:00:00
abstract::The heart is challenged by a plethora of extracellular stimuli over the course of a normal day, each of which distinctly influences myocardial contractile function. It is therefore not surprising that myocardial metabolism also oscillates in a time-of-day dependent manner. What is becoming increasingly apparent is tha...
journal_title:Cardiovascular research
pub_type: 杂志文章,评审
doi:10.1093/cvr/cvn054
更新日期:2008-07-15 00:00:00
abstract:AIMS:Hypercholesterolaemia and myeloperoxidase (MPO) overexpression are two well-recognized risk factors for ischaemic heart disease. Peroxisome proliferator-activated receptor-gamma (PPARgamma) agonists have recently been shown to reduce ischaemic heart injury in hypercholesterolaemic animals. However, whether PPARgam...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1093/cvr/cvn308
更新日期:2009-02-01 00:00:00
abstract::Atrial fibrillation is the most common cardiac arrhythmia with an overall prevalence of almost 1%. Increasing prevalence and associated risks such as stroke and mortality have increased the need for better and more reliable therapeutic treatment. This has stimulated research to elucidate the pathophysiological mechani...
journal_title:Cardiovascular research
pub_type: 杂志文章,评审
doi:10.1016/s0008-6363(01)00367-4
更新日期:2001-10-01 00:00:00
abstract:OBJECTIVE:Exposure to anoxia has been reported to activate ATP-sensitive potassium (K+(ATP)) channels in isolated ventricular myocytes. We aimed to investigate the mechanisms underlying the anoxia-induced activation of K+(ATP) channels. METHODS:Guinea pig ventricular myocytes were isolated using collagenase digestion....
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1016/s0008-6363(97)00092-8
更新日期:1997-08-01 00:00:00
abstract:OBJECTIVE:The endothelium is a newly recognised target tissue of parathyroid hormone (PTH). It is not clear whether hyperparathyroidism affects endothelial function and whether parathyroidectomy (Ptx) has an influence on arterial vessel wall properties. We studied brachial flow-mediated vasodilation (FMD) and brachial ...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1016/s0008-6363(00)00130-9
更新日期:2000-09-01 00:00:00
abstract:Aims:Heart failure (HF) produces left atrial (LA)-selective fibrosis and promotes atrial fibrillation. HF also causes adrenergic activation, which contributes to remodelling via a variety of signalling molecules, including the exchange protein activated by cAMP (Epac). Here, we evaluate the effects of Epac1-signalling ...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1093/cvr/cvy173
更新日期:2019-01-01 00:00:00
abstract:OBJECTIVE:Current guidelines are controversial regarding exercise intensity in cardiovascular prevention and rehabilitation. Although high-intensity training induces larger increases in fitness and maximal oxygen uptake (VO(2max)), moderate intensity is often recommended as equally effective. Controlled preclinical stu...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1016/j.cardiores.2005.03.010
更新日期:2005-07-01 00:00:00
abstract:OBJECTIVE:Pigment epithelial-derived factor (PEDF) is a potent anti-angiogenic factor whose effects are partially mediated through the induction of endothelial cell apoptosis. The pathway mediating endothelial cell apoptosis has not been fully established. Here we investigated the participation of peroxisome proliferat...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1016/j.cardiores.2007.06.032
更新日期:2007-11-01 00:00:00
abstract:AIMS:Sulfur dioxide (SO₂) is an air pollutant that impedes neonatal development and induces adverse cardiorespiratory health effects, including tachycardia. Here, an animal model was developed that enabled characterization of (i) in vivo alterations in heart rate and (ii) altered activity in brainstem neurons that cont...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1093/cvr/cvt057
更新日期:2013-07-01 00:00:00