Calcium-dependent Potassium Channels
Calcium-dependent Potassium Channels - Related Videos
10:07
High-throughput Screening for Small-molecule Modulators of Inward Rectifier Potassium Channels
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Cited by 20 •
2013
Methods for developing and validating a quantitative fluorescence assay for measuring the activity of inward rectifier potassium (Kir) channels for high-throughput compound screening is presented.
01:20
Antiepileptic Drugs: Potassium Channel Activators
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2024
Ezocgabine or retigabine, an antiepileptic drug of remarkable efficacy, has revolutionized the management of seizures. It is a potassium channel activator, explicitly targeting the family of Q subtype potassium channels. It enhances the transmembrane potassium currents, regulating neuronal excitability. This action stabilizes the resting membrane potential, a pivotal factor in mitigating the hyperexcitability that characterizes epilepsy. Ezogabine has gained approval as an adjunctive treatment...
10:59
Use of Label-free Optical Biosensors to Detect Modulation of Potassium Channels by G-protein Coupled Receptors
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Cited by 5 •
2014
Optical biosensor techniques can detect changes in mass near the plasma membrane in living cells and allow one to follow cellular responses in both individual cells and populations of cells. This protocol will describe detection of the modulation of potassium channels by G-protein coupled receptors in intact cells using this approach.
11:02
Exploring Arterial Smooth Muscle Kv7 Potassium Channel Function using Patch Clamp Electrophysiology and Pressure Myography
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Cited by 8 •
2012
Measurements of Kv7 (KCNQ) potassium channel activity in isolated arterial myocytes (using patch clamp electrophysiological techniques) in parallel with measurements of constrictor/dilator responses (using pressure myography) can reveal important information about the roles of Kv7 channels in vascular smooth muscle physiology and pharmacology.
01:12
Antiarrhythmic Drugs: Class III Agents as Potassium Channel Blockers
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2024
Class III antiarrhythmic drugs are a group of medications that can prolong action potentials in the heart. They achieve this by blocking potassium channels or enhancing inward currents from sodium channels. However, these drugs have a unique property of "reverse use-dependence," which is most pronounced at slower heart rates and can lead to torsades de pointes—a specific type of arrhythmia. However, it is essential to note that excessive QT interval prolongation—a measure of the heart's...
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Activation begins when neuronal activity raises intracellular calcium, either through voltage-gated calcium channels or through intracellular signaling. Calcium may bind directly to the channel or act through associated sensor proteins. This coupling allows the channel to respond to changes in calcium concentration and convert those signals into potassium movement across the membrane.
Once activated, potassium efflux shifts the membrane potential toward a more negative value, producing hyperpolarization. This electrical change contributes to the afterhyperpolarization that follows an action potential and can reduce the likelihood of immediate additional spiking. The resulting feedback helps shape firing patterns rather than simply turning neuronal activity on or off.
Calcium sensitivity determines how strongly a channel responds to a rise in intracellular calcium, while kinetics describe how rapidly its activity develops and changes over time. Together, these properties influence how neuronal activity is translated into membrane responses. They help explain why related channels can produce different effects on excitability, firing patterns, and signal timing.
Electrophysiological studies examine how neuronal membrane activity changes as calcium signals and stimulation vary. Researchers can relate electrical responses to action-potential firing, afterhyperpolarization, and changes in firing frequency, while considering the calcium entry or intracellular signaling associated with activation. This approach connects channel behavior with measurable changes in neuronal excitability.
Analyzing these channels can show how neurons regulate afterhyperpolarization, adapt their spike frequency during sustained activity, and influence synaptic transmission. Their effects provide information about how calcium signals are converted into electrical feedback. Such measurements help researchers interpret how neurons integrate activity and maintain stable signaling under changing stimulation conditions.
They provide a mechanistic link between intracellular calcium dynamics and the electrical behavior of neurons. Studying that link helps clarify how stimulation produces changes in firing, how synaptic activity is regulated, and how neurons avoid excessive or unstable responses. Their distinct calcium sensitivity and kinetics also make them useful for investigating the timing of neuronal integration.