Effects of premature stimulation on HERG K + channels
نویسندگان
چکیده
منابع مشابه
HERG-like K+ Channels in Microglia
A voltage-gated K+ conductance resembling that of the human ether-à-go-go-related gene product (HERG) was studied using whole-cell voltage-clamp recording, and found to be the predominant conductance at hyperpolarized potentials in a cell line (MLS-9) derived from primary cultures of rat microglia. Its behavior differed markedly from the classical inward rectifier K+ currents described previous...
متن کاملMolecular determinants of dofetilide block of HERG K+ channels.
The human ether-a-go-go-related gene (HERG) encodes a K+ channel with biophysical properties nearly identical to the rapid component of the cardiac delayed rectifier K+ current (IKr). HERG/IKr channels are a prime target for the pharmacological management of arrhythmias and are selectively blocked by class III antiarrhythmic methanesulfonanilide drugs, such as dofetilide, E4031, and MK-499, at ...
متن کاملIdiosyncratic Gating of HERG-like K 1 Channels in Microglia
A simple kinetic model is presented to explain the gating of a HERG-like voltage-gated K 1 conductance described in the accompanying paper (Zhou, W., F.S. Cayabyab, P.S. Pennefather, L.C. Schlichter, and T.E. DeCoursey. 1998. J. Gen. Physiol . 111:781–794). The model proposes two kinetically distinct closing pathways, a rapid one favored by depolarization (deactivation) and a slow one favored b...
متن کاملSaxitoxin Is a Gating Modifier of hERG K+ Channels
Potassium (K+) channels mediate numerous electrical events in excitable cells, including cellular membrane potential repolarization. The hERG K+ channel plays an important role in myocardial repolarization, and inhibition of these K+ channels is associated with long QT syndromes that can cause fatal cardiac arrhythmias. In this study, we identify saxitoxin (STX) as a hERG channel modifier and i...
متن کاملUp-Regulation of hERG K+ Channels by B-RAF
Human ether-a-go-go related-gene K⁺ channels (hERG) participate in the regulation of tumor cell proliferation and apoptosis. HERG channel activity is up-regulated by growth factors. Kinases sensitive to growth factor signaling include the serine/threonine protein kinase B-RAF. The present study thus explored whether B-RAF influences hERG channel expression and activity. To this end, hERG channe...
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ژورنال
عنوان ژورنال: The Journal of Physiology
سال: 2001
ISSN: 0022-3751,1469-7793
DOI: 10.1111/j.1469-7793.2001.00843.x