Abstract:
:The modulation of L-type Ca2+ currents (I(Ca,L)) by the basal activities of G proteins was studied in adult guinea pig ventricular myocytes by whole-cell patch-clamp techniques. With intrapipette guanosine triphosphate (GTP) (100 microM), a specific inhibition of G1 proteins by pertussis toxin (PTX) produced an increase in the basal density of I(Ca,L) (from 11.0+/-0.8, n = 13, to 25.0+/-2.0 pA/pF, n = 11, at OmV test potential). In addition, PTX shifted the forskolin (Fsk) concentration-I(Ca,L) response relation significantly leftward (EC50, = 63.7+/-12.5 vs 625+/-75 nM). With intrapipette guanosine diphosphate (GDP)betaS (1 mM), the Fsk-I(Ca,L) relation was also shifted leftward (EC50 = 197+/-18.3 vs 781+/-82.5 nM). However, chronic GDPbetaS dialysis accelerated the rundown of I(Ca,L) significantly, suggesting a potential contribution of Gs proteins in maintaining basal I(Ca,L). In contrast, intra-pipette GTPgammaS (100 microM) produced a transient rise in I(Ca,L) from 11.0+/-3.0 to 22.8+/-7.0 pA/pF (in 3.4 min after whole-cell formation at 0 mV, n = 9), presumably through the activation of Gs proteins. It was followed by a gradual decline in I(Ca,L) (to 15.5+/-3.5 pA/pF), which was still enhanced by Fsk (EC50 = 1450+/-98 nM), indicating that the current decay was not solely due to rundown but to activation of Gi proteins. Gs, in addition to Gi proteins, show sufficient basal activity to modulate I(Ca,L) in an agonist-independent manner.
journal_name
Heart Vesselsjournal_title
Heart and vesselsauthors
Makita T,Horie M,Xie LH,Okada Y,Sasayama Sdoi
10.1007/s003800070013subject
Has Abstractpub_date
2000-01-01 00:00:00pages
233-9issue
5eissn
0910-8327issn
1615-2573journal_volume
15pub_type
杂志文章abstract::Percutaneous transvenous mitral commissurotomy (PTMC) increases peak oxygen uptake (VO2) chronically, but not acutely, despite early symptomatic improvements. Analysis of transient VO2 responses to submaximal exercise (an exercise regimen more comparable to the patients' daily activities than that provided by maximal ...
journal_title:Heart and vessels
pub_type: 杂志文章
doi:10.1007/BF02911391
更新日期:1995-01-01 00:00:00
abstract::The resting full-cycle ratio (RFR), a novel resting index, is well correlated with and shows good diagnostic accuracy to the fractional flow reserve (FFR). However, discordance results between the RFR and FFR have been observed to occur in about 20% of cases. This study aimed to clarify the prevalence and factors of d...
journal_title:Heart and vessels
pub_type: 杂志文章
doi:10.1007/s00380-020-01763-1
更新日期:2021-01-05 00:00:00
abstract::In the present study, we investigated whether gallic acid (GA) can induce death in cultured vascular smooth muscle cells (VSMCs), and whether production of the hydroxyl radical (.OH) is involved in the process of GA action. GA killed cultured VSMCs from rat aorta, in a dosc- and time-dependent manner. Cytoplasmic shri...
journal_title:Heart and vessels
pub_type: 杂志文章
doi:10.1007/s003800070038
更新日期:2000-01-01 00:00:00
abstract::Existing methods to calculate pre-test probability of obstructive coronary artery disease (CAD) have been established using selected high-risk patients who were referred to conventional coronary angiography. The purpose of this study is to develop and validate our new method for pre-test probability of obstructive CAD...
journal_title:Heart and vessels
pub_type: 杂志文章
doi:10.1007/s00380-014-0515-6
更新日期:2015-09-01 00:00:00
abstract::Levels of testosterone and estradiol influence the incidence of cardiovascular diseases: generally, estrogens in females are protective before menopause; coronaropathies, hypertension, and dyslipidemias in normal men are more frequent at comparable ages. We investigated the modulation by castration of in vitro vasorea...
journal_title:Heart and vessels
pub_type: 杂志文章
doi:10.1007/s00380-008-1098-x
更新日期:2009-03-01 00:00:00
abstract::Periprocedural bleeding and thromboembolic events are worrisome complications of catheter ablation for atrial fibrillation (AF). Periprocedural anticoagulation management could decrease the risk of these complications. However, evaluation of the complications from pulmonary vein isolation using cryoballoon related to ...
journal_title:Heart and vessels
pub_type: 杂志文章,随机对照试验
doi:10.1007/s00380-019-01370-9
更新日期:2019-09-01 00:00:00
abstract::Dilated cardiomyopathy (DCM) is a common primary myocardial disease leading to congestive heart failure, arrhythmia and sudden cardiac death. Increasing studies demonstrate substantial genetic determinants for DCM. Nevertheless, DCM is of substantial genetic heterogeneity, and the genetic basis for DCM in most patient...
journal_title:Heart and vessels
pub_type: 杂志文章
doi:10.1007/s00380-017-1110-4
更新日期:2018-07-01 00:00:00
abstract::The role of inflammation in acute coronary syndrome (ACS) and the mechanism by which statin treats ACS is explored. Serum high-sensitivity C-reactive protein (hs-CRP) and interleukin-6 (IL-6) levels were measured in 50 patients with ACS [including 30 cases with unstable angina (UA) and 20 patients with acute myocardia...
journal_title:Heart and vessels
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1007/s00380-004-0776-6
更新日期:2004-11-01 00:00:00
abstract::The coronary flow velocity reserve (CFVR), a measure of endothelial function in coronary circulation, can be measured semi-invasively in the left anterior descending coronary artery by using stress transesophageal echocardiography (TEE). During the same stress TEE, aortic distensibility indices (elastic modulus [E(p)]...
journal_title:Heart and vessels
pub_type: 杂志文章
doi:10.1007/s00380-006-0939-8
更新日期:2007-03-01 00:00:00
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journal_title:Heart and vessels
pub_type: 杂志文章
doi:10.1007/BF01747190
更新日期:1996-01-01 00:00:00
abstract::In this study, coronary diagnostic parameters, pressure drop coefficient (CDP: ratio of trans-stenotic pressure drop to distal dynamic pressure), and lesion flow coefficient (LFC: ratio of % area stenosis (%AS) to the CDP at throat region), were evaluated to distinguish levels of %AS under varying contractility condit...
journal_title:Heart and vessels
pub_type: 杂志文章
doi:10.1007/s00380-013-0355-9
更新日期:2014-01-01 00:00:00
abstract::Left ventricular (LV) dilatation following myocardial infarction (MI) is a major determinant of the patient's prognosis, and myocardial energy metabolism may play a key role in LV remodeling. We aimed to investigate the relative timing of LV dilatation to LV function, myocardial energy regulation by uncoupling protein...
journal_title:Heart and vessels
pub_type: 杂志文章
doi:10.1007/s00380-004-0805-5
更新日期:2005-03-01 00:00:00
abstract::Raising high-density lipoprotein cholesterol (HDL-C) is an important strategy for reducing residual cardiovascular risk. In the present study, we sought to assess the effect of extended-release niacin/laropiprant on endothelial function in patients after a myocardial infarction with target low-density lipoprotein chol...
journal_title:Heart and vessels
pub_type: 杂志文章,随机对照试验
doi:10.1007/s00380-013-0367-5
更新日期:2014-05-01 00:00:00
abstract::Scanning electron microscopy was used to compare the shape, size, and connection of left ventricular (LV) myocytes between spontaneously hypertensive rats (SHR) and Wistar Kyoto rats (WKY) at 3, 8, 15, 35, and 63 weeks of age. For either strain at each age, five rats were studied, in which LV myocytes consisted of a c...
journal_title:Heart and vessels
pub_type: 杂志文章
doi:10.1007/BF02481739
更新日期:1999-01-01 00:00:00
abstract::We investigated the incidence of post-intubation hypotension (PIH) in hemodynamically stable patients with STEMI requiring rapid sequences intubation (RSI) and medicated with ketamine or midazolam as induction agent. STEMI patients admitted between 1st January 2009 and 1st January 2017 who did not receive any type of ...
journal_title:Heart and vessels
pub_type: 杂志文章
doi:10.1007/s00380-017-1049-5
更新日期:2018-03-01 00:00:00
abstract::Six patients with coronary arterial lesions due to Kawasaki disease underwent aortocoronary by-pass grafting at our institute. Before surgery, all of them had been closely monitored for some years by means of selective coronary arteriography, thallium myocardial imaging, electrocardiography (treadmill and/or Holter), ...
journal_title:Heart and vessels
pub_type: 杂志文章
doi:10.1007/BF02066356
更新日期:1985-05-01 00:00:00
abstract::Myocardial ischemia leads to the activation of neutrophils as well as endothelial cells. The interaction between these cells is dependent on certain adhesion glycoproteins which are expressed on their surface. Adhesion of neutrophils to endothelium, mediated by adhesion molecules, has been shown to result in coronary ...
journal_title:Heart and vessels
pub_type: 杂志文章
doi:10.1007/BF01745043
更新日期:1998-01-01 00:00:00
abstract::We retrospectively analyzed coronary arteriograms in 66 patients with hypertrophic cardiomyopathy (HCM) who underwent coronary arteriography. Four of these patients showed a large conus artery supplying the interventricular septum, and the characteristics of their echocardiograms revealed a marked interventricular sep...
journal_title:Heart and vessels
pub_type: 杂志文章
doi:10.1007/BF01745868
更新日期:1992-01-01 00:00:00
abstract::Activation of mineralocorticoid receptor antagonists (MRAs) is cardioprotective; however, this property is lost upon blockade or inactivation of adenosine (ADO) receptor A2b. In this study, we investigated whether the effects of MRAs are mediated by an interaction between cardioprotective ADO receptors A1 and A3. Spir...
journal_title:Heart and vessels
pub_type: 杂志文章
doi:10.1007/s00380-019-01542-7
更新日期:2020-05-01 00:00:00
abstract::The vascular responses to 5-hydroxytrypamine (5-HT), 5-carboxamidotryptamine (5-CT, a selective 5-HT1-like receptor agonist), alpha-methyl-5-HT (alpha-M-5-HT, a relatively selective 5-HT2 receptor agonist), noradrenaline (NA), and KCl were examined in isolated, cannulated, and perfused canine common carotid arterial p...
journal_title:Heart and vessels
pub_type: 杂志文章
doi:10.1007/BF01745103
更新日期:1994-01-01 00:00:00
abstract::Myocardial perfusion and perfusion reserve are diminished in patients with atrial fibrillation (AF). Phase-contrast (PC) cine magnetic resonance imaging (MRI) of the coronary sinus serves as a non-invasive means of quantifying coronary flow reserve (CFR) without any radioactive tracer. The present study aimed to evalu...
journal_title:Heart and vessels
pub_type: 杂志文章
doi:10.1007/s00380-020-01759-x
更新日期:2021-01-23 00:00:00
abstract::The purpose of this study was to examine factors influencing readmission to hospital in patients with heart failure. This multicenter, retrospective cohort study analyzed 197 heart failure patients admitted to the research cooperation facilities between January 2017 and November 2017. We defined the readmission group ...
journal_title:Heart and vessels
pub_type: 杂志文章,多中心研究
doi:10.1007/s00380-019-01500-3
更新日期:2020-03-01 00:00:00
abstract::Phrenic nerve (PN) stimulation is essential for the elimination of PN palsy during balloon-based pulmonary vein isolation (PVI). Although ultrasound-guided vascular access is safe, insertion of a PN stimulation catheter via central venous access carries a potential risk of the development of mechanical complications. ...
journal_title:Heart and vessels
pub_type: 杂志文章
doi:10.1007/s00380-019-01402-4
更新日期:2019-10-01 00:00:00
abstract::While recent guidelines for the treatment of acute heart failure syndromes (AHFS) recommend pharmacotherapy with vasodilators in patients without excessively low blood pressure (BP), few reports have compared the relative efficiency of vasodilators on hemodynamics in AHFS patients. The present study aimed to assess th...
journal_title:Heart and vessels
pub_type: 临床试验,杂志文章
doi:10.1007/s00380-012-0252-7
更新日期:2013-05-01 00:00:00
abstract::Early and long-term outcomes in elderly patients who underwent isolated aortic valve replacement (iAVR) are well defined. Conflicting data exist in elderly patients who underwent AVR plus coronary artery bypass grafting (CABG). We sought to evaluate the early and long-term outcomes of combined AVR + CABG in patients o...
journal_title:Heart and vessels
pub_type: 杂志文章
doi:10.1007/s00380-019-01519-6
更新日期:2020-04-01 00:00:00
abstract::Previous studies assessing vascular responses in nonexercising beds during exercise in patients with chronic heart failure (CHF) have yielded varying results. We proposed that the clinical and hemodynamic severity of heart failure may explain some of the variation. We reasoned that diastolic ventricular interaction (D...
journal_title:Heart and vessels
pub_type: 临床试验,杂志文章
doi:10.1007/BF03257232
更新日期:1998-01-01 00:00:00
abstract::To define mechanisms that may influence collateral circulation and angiogenesis, we investigated vascular endothelial growth factor (VEGF) mRNA expression in human hearts. In non-ischemic human hearts, VEGF mRNA was not detected in vessels, but was found in cardiomyocytes. In hearts with myocardial infarction, the int...
journal_title:Heart and vessels
pub_type: 杂志文章
doi:10.1007/BF01745169
更新日期:1996-01-01 00:00:00
abstract:BACKGROUND:An increase in epicardial adipose tissue (EAT) volume is associated with the development of atrial fibrillation (AF) and coronary artery disease (CAD), but little is known about differences in its distribution. METHODS AND RESULTS:We included 50 patients with paroxysmal AF (PAF), 50 patients with CAD, and 5...
journal_title:Heart and vessels
pub_type: 杂志文章
doi:10.1007/s00380-020-01575-3
更新日期:2020-08-01 00:00:00
abstract::Inflammatory markers are elevated in acute coronary syndromes, and are also known to play a crucial role in the pathogenesis of neointimal proliferation and stent restenosis. Drug-eluting stents (DESs) have been shown to decrease stent restenosis in different studies. In this study, we aimed to investigate the effect ...
journal_title:Heart and vessels
pub_type: 临床试验,杂志文章
doi:10.1007/s00380-007-1020-y
更新日期:2008-03-01 00:00:00
abstract::The records of 153 patients with doubly committed subarterial ventricular septal defect (DCVSD) who underwent intracardiac repair were analyzed to evaluate factors responsible for aortic valve leaflet deformity. The patients were divided into two groups according to their echocardiographic and angiographic features as...
journal_title:Heart and vessels
pub_type: 杂志文章
doi:10.1007/BF01747853
更新日期:1999-01-01 00:00:00