Abstract:
OBJECTIVE:The aim was to test for the presence of cAMPi activated and ATPo activated chloride conductances (ICl(cAMP) and ICl(ATP)) in mouse ventricular myocytes. METHODS:Membrane currents were measured in enzymatically dissociated ventricular myocytes using the whole cell configuration of the patch clamp technique. RESULTS:After inhibiting the activation of sodium, calcium, and potassium currents, increasing [cAMP]i with isoprenaline (1 microM), forskolin (10 microM), or isobutylmethylxanthine (500 microM) had no effect on residual membrane current but extracellular ATP (100 microM) elicited a time independent background conductance. The ATP-activated conductance was observed during voltage steps ranging from +40 to -110 mV from a holding potential of -30 mV within 1 min after adding ATP to the bath. The reversal potential for the ATP activated conductance varied with changes in the chloride gradient and was within several mV of the predicted Nernst potential for chloride. Partially substituting external chloride with aspartate attenuated the ATP activated currents and shifted the reversal potential to values close to those predicted for ECl, suggesting the chloride selective nature of the conductance. The poorly hydrolysable ATP analogue ATP gamma S (100 microM) also elicited the chloride conductance, suggesting purinoceptor linked activation rather than a mechanism dependent on hydrolysis of ATP by ectoATPases. The conductance may be activated following P2 and not P1 purinoceptor stimulation, since the P1 purinoceptor agonists adenosine (500 microM) and adenosine monophosphate (500 microM) had no effect in seven and four cells, respectively. Activation of ICl(ATP) is not likely to be dependent on increased [Ca2+]i since ATP activated the current in cells dialysed with 10 mM EGTA or 20 mM BAPTA. CONCLUSIONS:(1) cAMPi does not activate a chloride conductance in mouse ventricular myocytes; (2) ATPo does activate a chloride conductance, through stimulation of a P2 purinoceptor; and (3) Ca2+i and cAMPi are not involved in activation of ICl(ATP). Also, macroscopic ICl(ATP) from mouse ventricle and ICl(cAMP) from other species appear to be indistinguishable in terms of time independence and rectification properties that depend on the concentration and permeability of intracellular anions. ICl(ATP) could be of physiological and pathophysiological significance considering the ability of chloride channels to modulate cardiac electrical activity and the fact that ATP may be an important neuromediator in the heart.
journal_name
Cardiovasc Resjournal_title
Cardiovascular researchauthors
Levesque PC,Hume JRsubject
Has Abstractpub_date
1995-03-01 00:00:00pages
336-43issue
3eissn
0008-6363issn
1755-3245pii
0008-6363(96)88590-7journal_volume
29pub_type
杂志文章abstract::An investigation of changes in the Mg2+ -dependent, Na+ -K+ -stimulated sarcolemmal ATPase and of intracellular electrolytes in the left failing heart due to pressure overload (aortic banding) was carried out in dogs. There was no change in the sarcolemmal Mg2+ -ATPase of the left or right ventricle for the whole dura...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1093/cvr/13.2.95
更新日期:1979-02-01 00:00:00
abstract:OBJECTIVE:Anisotropic conduction characteristics, which may be expressed as the ratio of conduction velocities in the longitudinal (Vlong) and transverse (Vtrans) fibre directions, have been shown to stabilise reentry and favour the induction of sustained, uniform ventricular tachycardia. The aim of this study was to i...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1016/s0008-6363(96)88593-2
更新日期:1995-03-01 00:00:00
abstract:OBJECTIVE:The aim was to investigate whether infusion of either atrial natriuretic factor (ANF, 800 ng.h-1.rat-1) or a specific inhibitory of neutral endopeptidase 24.11 (NEI, UK 73,967, 5.4 mg.kg-1.d-1) can influence the reversal of the pulmonary vascular remodelling produced by exposure to hypoxia. METHODS:Male Wist...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1093/cvr/28.4.519
更新日期:1994-04-01 00:00:00
abstract::Diabetes is one of the most prevalent chronic conditions that has a high association with death from cardiovascular disease(s). An impaired cardiac function independent of vascular disease suggests the existence of a primary myocardial defect in diabetes mellitus. We and others have documented that myocardial performa...
journal_title:Cardiovascular research
pub_type: 杂志文章,评审
doi:10.1016/s0008-6363(97)00059-x
更新日期:1997-04-01 00:00:00
abstract:OBJECTIVE:Research in the pathophysiology of ischemia/reperfusion or redox signaling is hindered by lack of simple methodology to measure short-lived oxygen radicals. In the presence of hydroxyl radical ((*)OH), d-phenylalanine (d-Phe) yields para-, meta- and ortho-tyrosine. We have previously demonstrated that d-Phe c...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1016/j.cardiores.2006.03.005
更新日期:2006-07-15 00:00:00
abstract:AIMS:The expression of PUMA (p53-up-regulated modulator of apoptosis), an apoptosis-regulating gene, increases during endoplasmic reticulum stress. The mechanisms by which cyclic stretch influences the regulation of PUMA in vascular smooth muscle cells (VSMCs) during apoptosis remain unclear. We hypothesized that cycli...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1093/cvr/cvr280
更新日期:2012-01-01 00:00:00
abstract:AIMS:Smad7 plays a negative regulatory role in many inflammatory diseases, but its effect on hypertensive disease remains unknown. The present study tested the hypothesis that overexpression of Smad7 may have therapeutic potential for angiotensin II (Ang II)-mediated hypertensive cardiac remodelling. METHODS AND RESUL...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1093/cvr/cvt151
更新日期:2013-09-01 00:00:00
abstract:OBJECTIVE:The objective of this study was to investigate the relationship between acute decreases in right ventricular volume during Valsalva strain (with resultant changes in autonomic neural tone) and measures of local endocardial repolarization time independent of heart rate and autonomic neural tone. METHODS:Patie...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1016/s0008-6363(99)00261-8
更新日期:2000-01-14 00:00:00
abstract::STUDY OBJECTIVE - The aim of the study was to determine the changes in the beta adrenergic system induced by cardiac hypertrophy due to valvular aortic stenosis. DESIGN - Density of beta adrenoceptors, cardiac tissue noradrenalime concentrations, coronary blood flow (using radioactive microspheres), and haemodynamic v...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1093/cvr/24.1.65
更新日期:1990-01-01 00:00:00
abstract::Impairment of contractile function and extent of release of several intracellular marker enzymes and DNA were studied in isolated perfused rat hearts after low-flow (0.16 ml . min-1) ischaemia followed by 2 h of reperfusion and after anoxia followed by 2 h of reoxygenation. After varying periods of ischaemia or anoxia...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1093/cvr/18.12.768
更新日期:1984-12-01 00:00:00
abstract:AIMS:In developing blood vessel networks, the overall level of vessel branching often correlates with angiogenic sprout initiations, but in some pathological situations, increased sprout initiations paradoxically lead to reduced vessel branching and impaired vascular function. We examine the hypothesis that defects in ...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1093/cvr/cvw091
更新日期:2016-07-01 00:00:00
abstract::Regional distribution of myocardial blood flow (MBF) was examined in eight normal and nine pulmonary artery banded (PAB) pigs before and during pacing induced tachycardia (heart rates: 175, 225 and 275 beats X min-1) as well as during iv adenosine infusion (1.5 mg X kg-1 X min-1; maximal coronary vasodilatation) using...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1093/cvr/19.2.104
更新日期:1985-02-01 00:00:00
abstract::Circulating concentrations of leucocyte elastase and free radical activity were measured in 11 adults undergoing cardiopulmonary bypass. In all patients the bypass procedure was associated with pronounced changes in plasma elastase concentrations, and peak enzyme concentrations correlated closely with the duration of ...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1093/cvr/22.1.37
更新日期:1988-01-01 00:00:00
abstract:OBJECTIVE:The purpose of this study was to determine whether exercise training could precondition the myocardium against hydrogen peroxide (H(2)O(2))-induced damage. METHODS:Male Fischer 344 rats ran on a treadmill for 9 weeks (60 min/day, 22 m/min, 6 degrees grade, 5 days/week). Isolated perfused working hearts from ...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1016/s0008-6363(03)00285-2
更新日期:2003-06-01 00:00:00
abstract:AIMS:Ivabradine (Iva) has shown beneficial structural and functional effects in clinical and experimental heart failure (HF), but its action in combination with mechanical unloading (MU), such as during treatment with left ventricular assist devices (LVAD), is unknown. The aim of this study was to investigate the effec...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1093/cvr/cvs318
更新日期:2013-02-01 00:00:00
abstract::Atherosclerosis is characterized by a persistent, low-grade inflammation of the arterial wall. Monocytes and monocyte-derived macrophages play a pivotal role in the various stages of atherosclerosis. In the past few years, metabolic reprogramming has been identified as an important controller of myeloid cell activatio...
journal_title:Cardiovascular research
pub_type: 杂志文章,评审
doi:10.1093/cvr/cvz107
更新日期:2019-07-01 00:00:00
abstract:STUDY OBJECTIVE:The aim was to compare platelet function in diabetic and non-diabetic survivors of acute myocardial infarction and to relate it to an index of free radical activity in these patients. DESIGN:In vivo and in vitro indices of platelet function and diene conjugate molar ratios were measured in diabetic and...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1093/cvr/25.8.676
更新日期:1991-08-01 00:00:00
abstract:AIMS:The P2Y12 antagonist ticagrelor reduces mortality in patients with acute coronary syndrome (ACS), compared with clopidogrel, and the mechanisms underlying this effect are not clearly understood. Arterial thrombosis is the key event in ACS; however, direct vascular effects of either ticagrelor or clopidogrel with f...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1093/cvr/cvw233
更新日期:2017-01-01 00:00:00
abstract::Sinoatrial conduction times, estimated by premature atrial stimulation, were compared with direct measurement of the sinoatrial conduction time in 15 isolated rabbit sinus node preparations before and after intrasinusal pacemaker shifts induced by cooling. Transmembrane potentials and surface electrograms were recorde...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1093/cvr/20.2.81
更新日期:1986-02-01 00:00:00
abstract:BACKGROUND:Alkalinizing agents reverse cardiotoxicity of a variety of sodium channel blockers, including tricyclic antidepressants, but their mechanisms of action are poorly understood. PURPOSE:To establish the mechanisms by which alkalinization diminishes the sodium channel blocking action of imipramine. METHODS:The...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1016/s0008-6363(98)00011-x
更新日期:1998-05-01 00:00:00
abstract:OBJECTIVE:Some neuropeptides have direct cardiac effects and also modulate the cardiac effects of catecholamines. Vasopressin is an abundantly available neuropeptide having well known interactions with catecholamines in vascular smooth muscle. The aim of this study was to determine the direct and modulatory effects of ...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1093/cvr/27.9.1624
更新日期:1993-09-01 00:00:00
abstract:STUDY OBJECTIVE:The aim was to evaluate the protective effect of verapamil during myocardial ischaemia and reperfusion. DESIGN:In vivo phosphorus-31 (31P) magnetic resonance spectroscopy was performed on rats pretreated with verapamil (mg.kg-1 intraperitoneal) and controls during a 45 min left coronary artery occlusio...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1093/cvr/25.2.101
更新日期:1991-02-01 00:00:00
abstract::Atherosclerosis is considered to be a form of chronic inflammation governed by a complex network of inter- and intra-cellular signaling pathways. The pleiotropic cytokine interferon-gamma (IFN-gamma) is a key pro-inflammatory mediator that is expressed at high levels in atherosclerotic lesions. IFN-gamma regulates the...
journal_title:Cardiovascular research
pub_type: 杂志文章,评审
doi:10.1016/j.cardiores.2005.04.019
更新日期:2005-07-01 00:00:00
abstract:Aims:Dilated cardiomyopathy (DCM) induced chronic heart failure is a life-threatening disease worldwide. Long non-coding RNAs (lncRNAs) are potential new therapeutic targets and may provide new pathophysiological mechanisms for development of DCM. Methods and results:Microarray assays in 14 DCM and 10 control human he...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1093/cvr/cvy012
更新日期:2018-04-01 00:00:00
abstract:OBJECTIVE:Polymorphonuclear leukocytes (PMN), retained in the microvascular bed, can contribute to postischemic myocardial reperfusion injury. Since a beneficial effect of ACE-inhibition on reperfusion injury has been reported, we investigated the impact of cilazaprilat on PMN dependent reperfusion injury in isolated g...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1016/s0008-6363(97)00191-0
更新日期:1997-12-01 00:00:00
abstract::Cardiomyocytes are long-lived post-mitotic cells with limited regenerative capacity. Proper cardiomyocyte function depends critically on the maintenance of a healthy homeostasis of protein expression, folding, assembly, trafficking, function, and degradation, together commonly referred to as proteostasis. Impairment o...
journal_title:Cardiovascular research
pub_type: 杂志文章,评审
doi:10.1093/cvr/cvv265
更新日期:2016-04-01 00:00:00
abstract:OBJECTIVES:Plasma endothelin (ET) concentrations are increased in heart failure. The aims of the present study were to investigate to what extent cardiac ET mRNA expression is induced in ischemic heart failure and whether there may be compensatory downregulation of myocardial mRNA levels for the ETA and ETB receptor su...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1016/s0008-6363(96)00266-0
更新日期:1997-03-01 00:00:00
abstract:AIMS:Increased proinflammatory cytokines after myocardial infarction augment the progression of heart failure (HF) and are of prognostic significance. Recently, we demonstrated that increased proinflammatory cytokines in the brains of HF rats increased paraventricular nucleus (PVN) superoxide and down-regulated neurona...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1093/cvr/cvp160
更新日期:2009-09-01 00:00:00
abstract:AIMS:Human influenza A virus (hIAV) infection is associated with important cardiovascular complications, although cardiac infection pathophysiology is poorly understood. We aimed to study the ability of hIAV of different pathogenicity to infect the mouse heart, and establish the relationship between the infective capac...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1093/cvr/cvaa117
更新日期:2020-04-28 00:00:00
abstract:AIMS:Ventricular remodelling following myocardial infarction progressively leads to loss of contractile capacity and heart failure. Although calcineurin promotes maladaptive cardiac hypertrophy, we recently showed that the calcineurin splicing variant, CnAβ1, has beneficial effects on the infarcted heart. However, whet...
journal_title:Cardiovascular research
pub_type: 杂志文章
doi:10.1093/cvr/cvu068
更新日期:2014-06-01 00:00:00