Abstract：
:A diminished sympathetic activity has been related to training bradycardia seen at rest and during exercise. In order to evaluate if changes in heart adrenergic receptors can be one of the mechanisms by which the sympathetic responsiveness could be decreased by physical training, the number and affinity of beta-adrenergic receptors were determined in heart ventricular tissue of rats submitted to a 10-week running programme. Binding studies were done at different concentrations of (-)[3H] dihydroalprenolol (DHA) (0.5 to 14.4 nmol X litre-1) with ventricular membrane preparations from control and trained rats. Direct linear plot analysis revealed that physical training reduced the total number (1933 +/- 192 vs 2922 +/- 211 fmol X ventricles-1; P less than 0.01) density of beta-adrenergic receptors expressed either as fmol X mg-1 of membrane protein (34 +/- 3 vs 43 +/- 3; P less than 0.05) or as fmol X g-1 ventricle (1740 +/- 170 vs 2308 +/- 155; P less than 0.05). There was no significant change in the dissociation constant (3.11 +/- 0.14 vs 4.08 +/- 0.51 nmol X litre-1; P greater than 0.05). Basal plasma noradrenaline levels were not affected by training (116 +/- 18 vs 101 +/- 14 pg X cm-3; P greater than 0.10); however the adrenaline values were significantly higher in trained rats (91 +/- 16 vs 47 +/- 7 pg X cm-3; P less than 0.05). These data indicate that physical training induces changes at the level of beta-adrenergic receptors and this may partly explain the bradycardia seen in trained subjects and animals.
journal_name
Cardiovasc Resjournal_title
Cardiovascular researchauthors
Sylvestre-Gervais L,Nadeau A,Nguyen MH,Tancrède G,Rousseau-Migneron Sdoi
10.1093/cvr/16.9.530subject
Has Abstractpub_date
1982-09-01 00:00:00pages
530-4issue
9eissn
0008-6363issn
1755-3245journal_volume
16pub_type
杂志文章abstract：AIMS:Therapeutic use of sulfhydrylated inhibitor S-zofenopril has raised different hypotheses regarding the role played by its thiol group in the beneficial clinical effects exerted compared with other angiotensin-converting enzyme (ACE) inhibitors. Here, we investigated hydrogen sulfide (H2S) pathway as accountable fo...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1093/cvr/cvu026
更新日期：2014-04-01 00:00:00
abstract：OBJECTIVE:Myocardial cellular electrophysiology and intracellular Ca2+ regulation are altered in heart failure. The extent of these changes may vary within the layers of the ventricular wall. To examine this, cell size, action potential and intracellular Ca2+ transient characteristics (Fura-2) were measured in single c...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1016/s0008-6363(99)00360-0
更新日期：2000-01-14 00:00:00
abstract：AIMS:G-protein-coupled receptors (GPCRs) modulate vascular tone, at least in part, via matrix metalloproteinase (MMP) transactivation of the epidermal growth factor receptor (EGFR). We previously have identified novel signalling pathways downstream of the EGFR suggestive of mitogen-activated protein kinase and mitochon...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1093/cvr/cvp230
更新日期：2009-12-01 00:00:00
abstract：OBJECTIVE:To determine if angiogenesis is altered in adult Endoglin heterozygous (Eng(+/-)) mice, the animal model for the vascular disorder hereditary hemorrhagic telangiectasia type 1 (HHT1). METHODS:Primary cultures of endothelial cells were generated from Eng(+/-) and Eng(+/+) mice and analyzed for proliferation, ...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1016/j.cardiores.2005.11.020
更新日期：2006-03-01 00:00:00
abstract：OBJECTIVE:Diastolic dysfunction is a characteristic finding of the aged mammalian heart. Parvalbumin acts as a Ca2+ sink and enhances relaxation in skeletal muscle, and overexpression of parvalbumin in myocardium increased cardiac relaxation in vitro as well as in vivo. Therefore, the objective of this study is to test...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1016/j.cardiores.2004.06.028
更新日期：2005-05-01 00:00:00
abstract：STUDY OBJECTIVE:The aim was to evaluate the influence that centrally administered angiotensin-II has on the intrarenal renin-angiotensin system and renal sympathetic nerve activity. DESIGN:Renal responses to centrally administered angiotensin-II (10 micrograms) or saralasin (50 micrograms) were measured in anaesthetis...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1093/cvr/25.5.353
更新日期：1991-05-01 00:00:00
abstract：:Infarct size can be limited by reducing the determinants of infarct size or increasing collateral blood flow by treatment initiated before the ischaemic event. Reperfusion is the definitive treatment for permanently reducing infarct size and restoring some degree of contractile function to the affected myocardium. Inn...
journal_title：Cardiovascular research
pub_type： 杂志文章,评审
doi：10.1093/cvr/cvp129
更新日期：2009-07-15 00:00:00
abstract：AIMS:Our recent work demonstrated that common cardiovascular progenitor cells are characterized and induced by the expression of the transcription factor mesoderm posterior1 (MesP1) in vertebrate embryos and murine embryonic stem cells. As the proliferative potential of stem cell-derived cardiomyocytes is limited, it i...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1093/cvr/cvr158
更新日期：2011-10-01 00:00:00
abstract：:Since the establishment of the inflammatory basis of atherosclerosis, several pro- or anti-inflammatory agents have been examined as potential mediators of the biochemical pathways of lesion formation. Interleukin (IL)-8 was first characterized in 1987. Since then, knowledge regarding its role in leucocyte trafficking...
journal_title：Cardiovascular research
pub_type： 杂志文章,评审
doi：10.1093/cvr/cvp241
更新日期：2009-12-01 00:00:00
abstract：:The rate of QT adaptation to abrupt changes in pacing rate was studied in seven patients with newly diagnosed complete heart block with a ventricular escape rate of less than 40 beats.min-1. Their median age was 70 (range 36-84) years, and none was taking any cardioactive medication known to affect the QT interval. Fr...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1093/cvr/22.1.67
更新日期：1988-01-01 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：:The importance of the vascular adventitia is increasingly being recognized not only in vascular disease but also in normal maintenance and homeostasis of vessels. Activation of the adventitia and its resident fibrocytic cells in response to injury, stretch, cytokines, and hormones has been shown to stimulate different...
journal_title：Cardiovascular research
pub_type： 杂志文章,评审
doi：10.1016/j.cardiores.2007.06.016
更新日期：2007-09-01 00:00:00
abstract：OBJECTIVES:Angiotensin converting enzyme (ACE) activity in the plasma does not change significantly with hypertension in two-kidney, one-clip hypertensive (2K-1C) rats. However, heart ACE activity and mRNA increase with hypertension. We measured the ACE activity and mRNA in hypertrophied hearts at different times after...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：
更新日期：1995-08-01 00:00:00
abstract：AIMS:Ischaemia-reperfusion provokes barrier failure of the coronary microvasculature, impeding functional recovery of the heart during reperfusion. The aim of the present study was to investigate whether the stimulation of cGMP signalling by activation of soluble guanylyl cyclase (sGC) can reduce reperfusion-induced en...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1093/cvr/cvp065
更新日期：2009-07-15 00:00:00
abstract：:Reperfusion of the heart after a period of ischaemia leads to the opening of a nonspecific pore in the inner mitochondrial membrane, known as the mitochondrial permeability transition pore (MPTP). This transition causes mitochondria to become uncoupled and capable of hydrolysing rather than synthesising ATP. Unrestrai...
journal_title：Cardiovascular research
pub_type： 杂志文章,评审
doi：10.1016/S0008-6363(03)00533-9
更新日期：2004-02-15 00:00:00
abstract：OBJECTIVE:To determine the effect of acute left ventricular dilatation on refractoriness in normal hearts. METHODS:During sustained ventricular fibrillation (VF) in isolated perfused hearts, recording of local activation time yields VF intervals which provide an index of local refractoriness. Simultaneous measurement ...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1016/s0008-6363(98)00092-3
更新日期：1998-08-01 00:00:00
abstract：AIMS:Fibromuscular dysplasia (FMD) and spontaneous coronary artery dissection (SCAD) are related, non-atherosclerotic arterial diseases mainly affecting middle-aged women. Little is known about their physiopathological mechanisms. We aimed to identify rare genetic causes to elucidate molecular mechanisms implicated in ...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1093/cvr/cvaa161
更新日期：2020-06-12 00:00:00
abstract：OBJECTIVE:Inflammatory cells invade the fibrotic myocardium of spontaneously hypertensive rats at the same sites as where fibroblasts are produced. The role of these inflammatory cells in myocardial fibrogenesis was studied in the present work. METHODS:The production and distribution of proteins that may be implicated...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：
更新日期：1996-04-01 00:00:00
abstract：OBJECTIVE:The aim was to investigate the effects of a calcium antagonist (diltiazem) and a catecholamine (noradrenaline) on extracellular potassium accumulation during global ischaemia. METHODS:Extracellular potassium concentration ([K+]e) was measured during 30 min global ischaemia in the isolated rat heart using a v...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1093/cvr/26.11.1040
更新日期：1992-11-01 00:00:00
abstract：OBJECTIVES:Action potential prolongation related to the alteration of several membrane currents is constantly reported in heart failure (HF) but reports about its role in arrhythmogenesis are sparse. Our aim was to determine, by analogy with long QT syndromes, whether prolonged repolarization is associated with increas...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1016/s0008-6363(02)00236-5
更新日期：2002-04-01 00:00:00
abstract：STUDY OBJECTIVE:The aim was to investigate the effects of long-term treatment with an alpha 1 blocker, bunazosin hydrochloride, on blood pressure, heart weight, myocardial contractility, and ventricular myosin isoenzyme pattern in spontaneously hypertensive rats (SHR). DESIGN:Bunazosin hydrochloride was given orally i...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1093/cvr/25.7.565
更新日期：1991-07-01 00:00:00
abstract：OBJECTIVE:Atrial remodeling contributes to the maintenance of atrial fibrillation (AF) in several cardiac disorders. There is evidence that angiotensin-converting enzyme (ACE) inhibitors reduce the prevalence of AF in patients with congestive heart failure (CHF). There have been no studies performed to assess the effec...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1016/s0008-6363(02)00243-2
更新日期：2002-05-01 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：BACKGROUND:We, and others, have previously reported a strong correlation between increased inter-ventricular dispersion of repolarization and the occurrence of fatal arrhythmia in animal models of CHF. The existence of this and other such distinct electrophysiologic phenotypes in right (RV) vs. left ventricles (LV) cou...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1016/s0008-6363(02)00703-4
更新日期：2003-02-01 00:00:00
abstract：:The effects of both gradual and abrupt coronary occlusion on regional wall function (sonomicrometry) and left ventricular relaxation were studied in the intact dog heart. The ischaemic dysfunction observed in the two interventions as assessed by pressure-length loops showed considerably different patterns. The regiona...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1093/cvr/21.7.507
更新日期：1987-07-01 00:00:00
abstract：OBJECTIVE:Progressive loss of cardiomyocytes is one of the most important pathogenic characteristics of heart failure. Apoptosis may be an important mode of cell death in heart failure but it must be demonstrated by multiple criteria and not just TUNEL staining alone. Previously, we and others have demonstrated that be...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1016/s0008-6363(01)00290-5
更新日期：2001-08-01 00:00:00
abstract：:Atrial fibrillation (AF) is a very common clinical problem, and presently available treatment options are suboptimal. A tremendous amount has been learned over the past 10 years about the atrial substrates that support sustained AF at the tissue, ionic and molecular levels. This understanding of the fundamental mechan...
journal_title：Cardiovascular research
pub_type： 杂志文章,评审
doi：10.1016/s0008-6363(01)00562-4
更新日期：2002-05-01 00:00:00
abstract：:The significance of pre-existing coronary collaterals for preservation of the myocardium during coronary occlusion and reperfusion was studied in anaesthetised open-chest dogs. The extent of myocardial ischaemic damage was assessed by the accumulation of calcium in the central zone of the ischaemic area and the size o...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1093/cvr/14.5.288
更新日期：1980-05-01 00:00:00
abstract：AIMS:ATP sensitive K(+) channels (K(ATP)) sense adenine nucleotide concentrations and thus couple the metabolic state of the cell to membrane potential. The hetero-octameric complex of a sulphonylurea receptor (SUR2B) and an inwardly rectifying K(+) channel (Kir6.1) and the corresponding native channel in smooth muscle...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1093/cvr/cvn138
更新日期：2008-09-01 00:00:00
abstract：AIMS:Insulin (Ins) resistance (IRES) associates to increased cardiovascular risk as observed in metabolic syndrome. Chronic stimulation of beta-adrenergic receptors (betaAR) due to exaggerated sympathetic nervous system activity is involved in the pathogenesis of IRES. The cellular levels of G protein coupled receptor ...
journal_title：Cardiovascular research
pub_type： 杂志文章
doi：10.1093/cvr/cvp252
更新日期：2009-12-01 00:00:00
