Ioannis Smyrnias

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Over the past 15 years or so, numerous studies have sought to characterise how nuclear calcium (Ca2+) signals are generated and reversed, and to understand how events that occur in the nucleoplasm influence cellular Ca2+ activity, and vice versa. In this Commentary, we describe mechanisms of nuclear Ca2+ signalling and discuss what is known about the origin(More)
Narrow, tubular, inward projections of the sarcolemma ('T-tubules') are an established feature of adult mammalian ventricular myocytes that enables them to generate the whole-cell Ca2+ transients and produce coordinated contraction. Loss of T-tubules can occur during ageing and under pathological conditions, leading to altered cardiac excitation-contraction(More)
Endothelin-1 (ET-1) is a potent G(q)-coupled agonist with important physiological effects on the heart. In the present study, we characterised the effect of prolonged ET-1 stimulation on Ca(2+) signalling within acutely isolated atrial myocytes. ET-1 induced a reproducible and complex sequence of effects, including negative inotropy, positive inotropy and(More)
Whereas Ca(2+) signalling in ventricular cardiomyocytes is well described, much less is known regarding the Ca(2+) signals within atrial cells. This is surprising given that atrial cardiomyocytes make an important contribution to the refilling of ventricles with blood, which enhances the subsequent ejection of blood from the heart. The dependence of cardiac(More)
Ca(2+) increases in the heart control both contraction and transcription. To accommodate a short-term increased cardiovascular demand, neurohormonal modulators acting on the cardiac pacemaker and individual myocytes induce an increase in frequency and magnitude of myocyte contraction respectively. Prolonged, enhanced function results in hypertrophic growth(More)
BACKGROUND AND PURPOSE Vessel graft failure is typically associated with arteriosclerosis, in which endothelial dysfunction/damage is a key event. Resveratrol has been shown to possess cardioprotective capacity and to reduce atherosclerosis. We aimed to study the influence of resveratrol on the behavior of resident stem cells that may contribute to graft(More)
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