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Oldal 1 tól től 47 eredmények
Effects of NKH477, a water-soluble forskolin derivative, on cardiac function in rats with chronic heart failure after myocardial infarction.
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Our study was designed to determine whether NKH477, a novel, potent and water-soluble forskolin derivative, may exert a positive inotropic effect in rats with chronic heart failure (CHF) after myocardial infarction. Cardiac output and stroke volume indices were decreased and systemic vascular
Potent adenylate cyclase agonist forskolin restores myoprotective effects of ischemic preconditioning in rat hearts after myocardial infarction.
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BACKGROUND
The purpose of this study was to determine whether ischemic preconditioning (IPC) provides myoprotective effects in post-myocardial infarction (MI) hearts, and whether beta adrenergic signaling is involved in IPC.
METHODS
Rats were subjected to either ligation of the left anterior
H-89, a non-specific inhibitor of protein kinase A, promotes post-ischemic cardiac contractile recovery and reduces infarct size.
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Myocardial ischemia is associated with increased production of cyclic adenosine monophosphate (cAMP), with potentially deleterious effects. We hypothesized that the ischemia-induced activation of cAMP-dependent protein kinase A (PKA), could beneficially be inhibited by a PKA-inhibitor
Effects of the angiotensin-converting enzyme inhibitor enalapril on sympathetic neuronal function and beta-adrenergic desensitization in heart failure after myocardial infarction in rats.
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One of the beneficial effects of angiotensin-converting enzyme (ACE) inhibitors in the treatment of heart failure may derive from sympathoinhibition and the prevention of beta-adrenergic desensitization. However, the roles of these properties in the overall effects of ACE inhibitor are not clear. We
Influence of cardiac dysfunction on fast sodium current regulation by Forskolin.
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There are several reports of an altered beta-adrenergic pathway in heart failure. Since the fast cardiac sodium current (INa+) is also subject to beta-receptor dependent regulation, we investigated its regulation in a model of cardiac dysfunction. Adenylyl cyclase was stimulated directly with
Behavioral and histological evaluation of a focal cerebral infarction rat model transplanted with neurons induced from bone marrow stromal cells.
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Neurons can be specifically induced from bone marrow stromal cells (MSCs) with extremely high efficiency using gene transfection of the Notch intracellular domain and subsequent treatment with basic-fibroblast growth factor, forskolin, and ciliary neurotrophic factor. We investigated the behavioral
Myocyte response to beta-adrenergic stimulation is preserved in the noninfarcted myocardium of globally dysfunctional rat hearts after myocardial infarction.
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BACKGROUND
Cellular mechanisms underlying the diminished inotropic response of remodeled hearts after myocardial infarction (MI) remain unclear.
RESULTS
Left ventricular (LV) remodeling and function were assessed by 2D echocardiography and isolated perfused heart studies in 6-week post-MI and
Inotropic responses to human gene 2 (B29) relaxin in a rat model of myocardial infarction (MI): effect of pertussis toxin.
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Relaxin produces powerful inotropic and chronotropic responses in isolated atria. The effect of relaxin has been examined in a rat model of cardiac failure, induced by myocardial infarction (MI). Maximum inotropic responses to isoprenaline (sham 5.4+/-0.3 mN; MI 2.6+/-0.3 mN; P<0.001) and relaxin
Decreased type VI adenylyl cyclase mRNA concentration and Mg(2+)-dependent adenylyl cyclase activities and unchanged type V adenylyl cyclase mRNA concentration and Mn(2+)-dependent adenylyl cyclase activities in the left ventricle of rats with myocardial infarction and longstanding heart failure.
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OBJECTIVE
To address the effect of longstanding left ventricular (LV) hypertrophy and failure on LV adenylyl cyclase (AC) gene expression, mRNA concentrations of the main cardiac AC isoforms were measured in the non-infarcted area of LV from rats with myocardial infarction (MI), without (H) or with
Beta-adrenoceptor and adenylate cyclase function in the infarct model of rat heart failure.
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In order to determine the possible etiology for diminished inotropic responsiveness to catecholamines in the infarction model of chronic congestive heart failure in rats, we studied beta-adrenoceptor number and site-specific stimulated adenylate cyclase activity in noninfarcted left ventricular
Vascular beta-adrenergic receptor system is dysfunctional after myocardial infarction.
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We identified abnormalities in the vascular beta-adrenergic receptor (beta-AR) signaling pathway in heart failure after myocardial infarction (MI). To examine these abnormalities, we measured beta-AR-mediated hemodynamics, vascular reactivity, and the vascular beta-AR molecular signaling components
Improvement of cardiac function and beta-adrenergic signal transduction by propionyl L-carnitine in congestive heart failure due to myocardial infarction.
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OBJECTIVE
Earlier studies have revealed beneficial effects of metabolic therapy in animals with congestive heart failure (CHF) due to myocardial infarction. Because heart failure is also associated with attenuated response to catecholamines, we examined the effects of propionyl L-carnitine (PLC) (a
Inotropic responses to isoproterenol in congestive heart failure subsequent to myocardial infarction in rats.
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It is well known that the positive inotropic effect of catecholamines is mediated through the activation of adrenergic receptors and the formation of cyclic adenosine monophosphate (AMP) in the cardiac cell. Although attenuated responses of failing hearts to catecholamines are commonly seen in
Desensitization of cardiac beta-adrenoceptor signaling with heart failure produced by myocardial infarction in the rat. Evidence for the role of Gi but not Gs or phosphorylating proteins.
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This study examined mechanisms of beta-adrenergic (AR) desensitization in a myocardial infarction (MI) model of heart failure in the rat. Inotropic responses to isoproterenol (non-selective beta-AR agonist) and RO 363 (selective beta1-AR agonist), in left atria and left papillary muscle, were
Adenylyl cyclase regulation in heart failure due to myocardial infarction in rats.
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Cardiac adenylyl cyclase (AC) activity was described to be differentially regulated in left and right ventricles (LVs and RVs) of rats with heart failure (HF) due to LV myocardial infarction (MI) (Sethi et al. Am J Physiol 272:H884-H893, 1997). AC activities in LVs and RVs were increased and
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