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Strana 1 od 137 výsledky
Effects of caffeine and ryanodine on delayed afterdepolarizations and sustained rhythmic activity in 1-day-old myocardial infarction in the dog.
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Caffeine and ryanodine are known to modulate oscillatory release of Ca2+ from the sarcoplasmic reticulum. The effects of caffeine and ryanodine on delayed afterdepolarizations (DADs) and sustained rhythmic activity in subendocardial Purkinje fibers surviving 1-day-old myocardial infarction in the
Cardiac-Specific Caveolin-3 Overexpression Prevents Post-Myocardial Infarction Ventricular Arrhythmias by Inhibiting Ryanodine Receptor-2 Hyperphosphorylation.
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Cardiomyocytes hypertrophic status after myocardial infarction determines distinct types of arrhythmia: role of the ryanodine receptor.
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The mechanisms responsible for sudden cardiac death in heart failure (HF) are unclear. We investigated early and delayed afterdepolarizations (EADs, DADs) in HF. Cardiomyocytes were enzymatically isolated from the right ventricle (RV) and the septum of rats 8 weeks after myocardial infarction (MI)
Defects in ryanodine receptor calcium release in skeletal muscle from post-myocardial infarct rats.
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Defective calcium (Ca2+) signaling and impaired contractile function have been observed in skeletal muscle secondary to impaired myocardial function. However, the molecular basis for these muscle defects have not been identified. In this study, we evaluated the alterations of the ryanodine-sensitive
Atrial Infarction-Induced Spontaneous Focal Discharges and Atrial Fibrillation in Sheep: Role of Dantrolene-Sensitive Aberrant Ryanodine Receptor Calcium Release.
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BACKGROUND
The mechanisms underlying spontaneous atrial fibrillation (AF) associated with atrial ischemia/infarction are incompletely elucidated. Here, we investigate the mechanisms underlying spontaneous AF in an ovine model of left atrial myocardial infarction (LAMI).
RESULTS
LAMI was created by
Hyperphosphorylation of the cardiac ryanodine receptor at serine 2808 is not involved in cardiac dysfunction after myocardial infarction.
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BACKGROUND
Abnormal behavior of the cardiac ryanodine receptor (RyR2) has been linked to cardiac arrhythmias and heart failure (HF) after myocardial infarction (MI). It has been proposed that protein kinase A (PKA) hyperphosphorylation of the RyR2 at a single residue, Ser-2808, is a critical
Ablation of PLN rescues reperfusion arrhythmias but exacerbates myocardium infarction in hearts with Ca2+/calmodulin kinase II constitutive phosphorylation of ryanodine receptors.
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UNASSIGNED
Abnormal Ca2+ release from the sarcoplasmic reticulum (SR), associated with CaMKII-dependent phosphorylation of RyR2 at Ser2814, has consistently been linked to arrhythmogenesis and ischemia/reperfusion-induced cell death. In contrast, the role played by SR Ca2+ uptake under these stress
Analysis of calstabin2 (FKBP12.6)-ryanodine receptor interactions: rescue of heart failure by calstabin2 in mice.
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The ryanodine receptor (RyR)/calcium-release channel on the sarcoplasmic reticulum mediates intracellular calcium release required for striated muscle contraction. RyR2, the predominant isoform in cardiac myocytes, comprises a macromolecular complex that includes calstabin2 (FKBP12.6). Calstabin2,
Cardiac sarcoplasmic reticular function in rats with chronic heart failure following myocardial infarction.
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Sarcoplasmic reticular function of rats with chronic heart failure (CHF) following coronary artery ligation was examined. The coronary artery ligation produced 43% infarction of the left ventricle and increased left ventricular end-diastolic pressure 8 weeks after the operation, suggesting the
(N-3) long-chain polyunsaturated fatty acids prolong survival following myocardial infarction in rats.
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Many clinical studies report that (n-3) PUFAs decrease the incidence of sudden death in patients with coronary artery disease after myocardial infarction (MI). However, the mechanisms for the beneficial effects of (n-3) PUFAs are unknown. The objectives of the present study were to confirm the
Effect of ryanodine on ventricular fibrillation induced by myocardial ischaemia.
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OBJECTIVE
Myocardial ischaemia can provoke a rise in cytosolic calcium which may in turn trigger malignant ventricular arrhythmias. Recently, inhibition of calcium entry has been shown to prevent these lethal arrhythmias. However, the contributions of calcium release from cytosolic stores to these
Correlation between oxidative stress and alteration of intracellular calcium handling in isoproterenol-induced myocardial infarction.
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Myocardial Ca(2+) overload and oxidative stress are well documented effects associated to isoproterenol (ISO)-induced myocardial necrosis, but information correlating these two issues is scarce. Using an ISO-induced myocardial infarction model, 3 stages of myocardial damage were defined:
Chronic intermittent hypoxia alters Ca2+ handling in rat cardiomyocytes by augmented Na+/Ca2+ exchange and ryanodine receptor activities in ischemia-reperfusion.
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This study examined Ca(2+) handling mechanisms involved in cardioprotection induced by chronic intermittent hypoxia (CIH) against ischemia-reperfusion (I/R) injury. Adult male Sprague-Dawley rats were exposed to 10% inspired O(2) continuously for 6 h daily from 3, 7, and 14 days. In isolated
Selective modulation of coupled ryanodine receptors during microdomain activation of calcium/calmodulin-dependent kinase II in the dyadic cleft.
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BACKGROUND
In ventricular myocytes of large mammals with low T-tubule density, a significant number of ryanodine receptors (RyRs) are not coupled to the sarcolemma; cardiac remodeling increases noncoupled RyRs.
OBJECTIVE
Our aim was to test the hypothesis that coupled and noncoupled RyRs have
Effects of long-term treatment with trandolapril on sarcoplasmic reticulum function of cardiac muscle in rats with chronic heart failure following myocardial infarction.
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1 Calcium transport activity of isolated cardiac sarcoplasmic reticulum (SR) including Ca2+ uptake and release is decreased in animals with chronic heart failure (CHF) following myocardial infarction. The present study was undertaken to determine whether an angiotensin converting enzyme (ACE)
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