forskolin/infarction

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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