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Page 1 od 1759 rezultati
Connexin 43 and ATP-sensitive potassium channels crosstalk: a missing link in hypoxia/ischemia stress.
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Connexin 43 (Cx43) is a gap junction protein expressed in various tissues and organs of vertebrates. Besides functioning as a gap junction, Cx43 also regulates diverse cellular processes like cell growth and differentiation, cell migration, cell survival, etc. Cx43 is critical for normal cardiac
ATP-sensitive potassium channels in the sinoatrial node contribute to heart rate control and adaptation to hypoxia.
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ATP-sensitive potassium channels (KATP) contribute to membrane currents in many tissues, are responsive to intracellular metabolism, and open as ATP falls and ADP rises. KATP channels are widely distributed in tissues and are prominently expressed in the heart. They have generally been observed in
Sevoflurane preconditioning attenuates the fall in adenosine triphosphate levels, but does not alter the changes in sodium and potassium levels during hypoxia in rat hippocampal slices.
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BACKGROUND
Sevoflurane preconditioning improves recovery after hypoxia. Sevoflurane administered before and during hypoxia improved recovery and attenuated the changes in intracellular sodium, potassium, and adenosine triphosphate (ATP) levels during hypoxia. In this study, the authors examine the
The effect of hydrogen peroxide on hypoxia, prostaglandin F2 alpha and potassium chloride induced contractions in isolated rat pulmonary arteries.
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We have investigated the action of the product of the enzyme NADPH oxidase; hydrogen peroxide (H2O2), on the first phase of the hypoxic contraction, prostaglandin F2 alpha (PGF2 alpha)-induced contractions and potassium chloride (KCl)-induced contractions, in isolated rat pulmonary arteries in a
Effects of hypoxia upon contractions evoked in isolated rabbit pulmonary artery by potassium and noradrenaline.
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1. Comparisons have been made between rabbit thoracic aorta and main pulmonary artery of the effects of hypoxia upon contractions evoked by noradrenaline (NA) and KCl (K+). 2. Contractions were evoked in cylindrical sections of pulmonary artery and aorta, mounted for isometric recording of tension,
[Chronic intermittent hypoxia decreases acute hypoxic inhibition of voltage-gated potassium channel in rat pulmonary arterial smooth muscle cells].
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For determination the ionic mechanisms of the hypoxic acclimatization at the level of channels, male Spradue-Dawley rats were divided into two groups: control normoxic group and chronic intermittent hypoxic group [O2 concentration: (10 +/-0.5)%, hypoxia 8 h a day]. Using whole cell patch-clamp
[Effects of acute hypoxia on potassium channels in spiral ganglion cells of SD rats].
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OBJECTIVE
The present study was to investigate the effects of acute hypoxia on the electrophysiological properties and outward current of spiral ganglion cell (SGC).
METHODS
SGC of newborn's Sprague Dawley (SD) rats were isolated and digested, primary cultured neurons for 8 h. By perfusion with
Effect of anoxia on intracellular and extracellular potassium activity in hypoglossal neurons in vitro.
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1. A brain slice preparation was used to study the hypoglossal (XII) neuronal response to anoxia. Both intra- and extracellular potassium activities (K+i,K+o) were measured by the use of ion-selective microelectrodes, and K+ flux was assessed by the use of pharmacologic blockers. 2. Extracellular
Protective effect of proanthocyanidins on anoxia-reoxygenation injury of myocardial cells mediated by the PI3K/Akt/GSK-3β pathway and mitochondrial ATP-sensitive potassium channel.
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The aim of the present study was to examine the protective effect of proanthocyanidins anoxia-reoxygenation injury of myocardial cells and its association with phosphatidylinositol-3-kinase/Akt and glycogen synthase kinase (PI3K/Akt/GSK)-3β and ATP-sensitive potassium channels. Neonatal rat
Hypoxia sensitivity of a voltage-gated potassium current in porcine intrapulmonary vein smooth muscle cells.
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Hypoxia contracts the pulmonary vein, but the underlying cellular effectors remain unclear. Utilizing contractile studies and whole cell patch-clamp electrophysiology, we report for the first time a hypoxia-sensitive K(+) current in porcine pulmonary vein smooth muscle cells (PVSMC). Hypoxia induced
Activation of potassium channels by hypoxia and reoxygenation in the human lung adenocarcinoma cell line A549.
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Active oxygen species are generated in cells during pathophysiologic conditions such as inflammation and postischemic reperfusion. If oxygen radical scavengers are added before reperfusion, then the magnitude of injury is reduced. We investigated whether free radicals generated following exposure to
A link between adenosine, ATP-sensitive K+ channels, potassium and muscle vasodilatation in the rat in systemic hypoxia.
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1. In anaesthetized rats, systemic hypoxia evoked hyperventilation, tachycardia, a fall in arterial pressure, vasodilatation in skeletal muscle and increases in K+ concentration measured in arterial plasma ([K+]a), venous efflux from muscle ([K+]v) and in right atrial plasma ([K+]at). The
Central venous hypoxemia is a determinant of human atrial ATP-sensitive potassium channel expression: evidence for a novel hypoxia-inducible factor 1alpha-Forkhead box class O signaling pathway.
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ATP-sensitive potassium channels couple cell excitability to energy metabolism, thereby providing life-saving protection of stressed cardiomyocytes. The signaling for ATP-sensitive potassium channel expression is still unknown. We tested involvement of biochemical and biophysical parameters and
Resistance of Fetal Guinea Pig Ventricular Myocardium to Hypoxia: Maintained Intracellular ATP Prevents the Opening of ATP-Sensitive Potassium Channels.
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The presence and function of the ATP-sensitive potassium channel current (IKATP) were examined in the guinea pig myocardium to clarify the mechanisms for the resistance of the fetal myocardium to hypoxia. Experimental hypoxia markedly reduced the action potential duration and contractile
Age-related modifications of potassium homeostasis and synaptic transmission during and after anoxia in rat hippocampal slices.
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Age-related changes in the capacity of the brain to survive short anoxic episodes were studied in stratum pyramidale (region CA1) of hippocampal slices from control (6-7 months) and aged (26-27 months) rats. Our primary interest was in how aging affected the ability of slices to maintain or to
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