Mechanisms Underlying Rate-Dependent Remodeling of Transient Outward Potassium Current in Canine Ventricular Myocytes
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چکیده
منابع مشابه
Mechanisms underlying rate-dependent remodeling of transient outward potassium current in canine ventricular myocytes.
Transient outward K+ current (I to) downregulation following sustained tachycardia in vivo is usually attributed to tachycardiomyopathy. This study assessed potential direct rate regulation of cardiac I(to) and underlying mechanisms. Cultured adult canine left ventricular cardiomyocytes (37 degrees C) were paced continuously at 1 or 3 Hz for 24 hours. I to was recorded with whole-cell patch cla...
متن کاملTwo components of transient outward current in canine ventricular myocytes.
Repolarization during phase 1 of cardiac action potential is important in that it may influence both impulse conduction in partially depolarized tissue and action potential duration. Thus, it is important to know the properties and regulation of the underlying currents. In about 50% of canine ventricular myocytes, the actin potential displays a phase 1 of fast repolarization and a prominent not...
متن کاملCharacterization of a transient outward K1 current with inward rectification in canine ventricular myocytes
Li, Gui-Rong, Haiying Sun, and Stanley Nattel. Characterization of a transient outward K1 current with inward rectification in canine ventricular myocytes. Am. J. Physiol. 274 (Cell Physiol. 43): C577–C585, 1998.—The threshold potential for the classical depolarization-activated transient outward K1 current and Cl2 current is positive to 230 mV. With the whole cell patch technique, a transient ...
متن کاملEffect of acidosis on transient outward potassium current in isolated rat ventricular myocytes.
The effect of acidosis on the transient outward K(+) current (I(to)) of rat ventricular myocytes has been investigated using the perforated patch-clamp technique. When the holding potential was -80 mV, depolarizing pulses to potentials positive to -20 mV activated I(to) in subepicardial cells but activated little I(to) in subendocardial cells. Exposure to an acid solution (pH 6.5) had no signif...
متن کاملCharacterization of a transient outward K+ current with inward rectification in canine ventricular myocytes.
The threshold potential for the classical depolarization-activated transient outward K+ current and Cl- current is positive to -30 mV. With the whole cell patch technique, a transient outward current was elicited in the presence of 5 mM 4-aminopyridine (4-AP) and 5 μM ryanodine at voltages positive to the K+ equilibrium potential in canine ventricular myocytes. The current was abolished by 200 ...
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ژورنال
عنوان ژورنال: Circulation Research
سال: 2008
ISSN: 0009-7330,1524-4571
DOI: 10.1161/circresaha.108.171157