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Related Concept Videos

Antihypertensive Drugs: Potassium-Sparing Diuretics01:28

Antihypertensive Drugs: Potassium-Sparing Diuretics

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Liddle syndrome is a genetically inherited form of hypertension characterized by the overactivity of epithelial sodium channels in the nephron, the functional unit of the kidney. This heightened activity leads to increased sodium reabsorption and excessive excretion of potassium. To counteract this, potassium-sparing diuretics such as amiloride are used. They function by blocking these sodium channels, thereby reducing the influx of sodium into the epithelial cells and minimizing the loss of...
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Antiepileptic Drugs: Potassium Channel Activators01:20

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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...
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Voltage-gated Ion Channels01:26

Voltage-gated Ion Channels

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Voltage-gated ion channels are transmembrane proteins that open and close in response to changes in the membrane potential. They are present on the membranes of all electrically excitable cells such as neurons, heart, and muscle cells.
Generally, all voltage-gated ion channels have a 'voltage-sensing domain' that spans the lipid bilayer. The charged residues in the sensor move in response to the membrane potential changes that open the channel allowing ions movement. There are several...
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Non-gated Ion Channels01:24

Non-gated Ion Channels

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Ion channels are specialized proteins on the plasma membrane that allow charged ions to pass down their electrochemical gradient. Their main function is to maintain the membrane potential which is critical for cell viability. These channels are either gated or non-gated and can transport more than a thousand ions within milliseconds for the cellular event to occur.
Compared to the gated ion channels, the non-gated channels, also known as leakage or passive channels, have no gating mechanism....
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Ligand-Gated Ion Channel Receptor: Gating Mechanism01:30

Ligand-Gated Ion Channel Receptor: Gating Mechanism

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Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
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Ligand-gated Ion Channels01:19

Ligand-gated Ion Channels

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Ligand-gated ion channels are transmembrane proteins with a channel for ions to pass through and a binding site for a ligand. The channel opens only when a ligand attaches to the binding site.
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Updated: Jul 23, 2025

Isolation and Kv Channel Recordings in Murine Atrial and Ventricular Cardiomyocytes
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Potential Benefit of Channel Activators in Loss-of-Function Primary Potassium Channelopathies Causing Heredoataxia.

José Gazulla1, José Berciano2

  • 1Department of Neurology, Hospital Universitario Miguel Servet, Isabel la Católica, 1-3, 50009, Saragossa, Spain. josegazulla@gmail.com.

Cerebellum (London, England)
|July 17, 2023
PubMed
Summary

Potassium channel (KCN) dysfunction contributes to hereditary ataxias like spinocerebellar ataxia (SCA). Non-specific KCN opening agents may improve symptoms by restoring normal cell activity.

Keywords:
Episodic ataxia type 1Myoclonus epilepsy and ataxia due to KCNC1 mutationPotassium channelPotassium channel openerSpinocerebellar ataxia type 13Spinocerebellar ataxia type 19

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Patch Clamp and Perfusion Techniques for Studying Ion Channels Expressed in Xenopus oocytes
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Last Updated: Jul 23, 2025

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Determination of the Relative Cell Surface and Total Expression of Recombinant Ion Channels Using Flow Cytometry
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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • Potassium channels (KCN) are crucial for regulating cell membrane potential and action potential duration.
  • KCN dysfunction can lead to neurological disorders, including hereditary ataxias.

Purpose of the Study:

  • To investigate the role of KCN dysfunction in hereditary ataxias.
  • To explore the therapeutic potential of KCN opening agents (KCO) for these conditions.

Main Methods:

  • A comprehensive review of existing medical literature was conducted.
  • Analysis focused on KCN mutations associated with ataxia and the mechanisms of KCO.

Main Results:

  • Mutations in Kv3.3, Kv4.3, and Kv1.1 channels are linked to spinocerebellar ataxia (SCA) types 13, 19/22, and episodic ataxia type 1 (EA1).
  • Reduced K+ efflux in affected models causes prolonged depolarization and impaired repetitive firing.
  • Non-specific KCOs demonstrated potential to ameliorate ataxic symptoms in experimental models.

Conclusions:

  • KCN dysfunction is implicated in the pathogenesis of specific hereditary ataxias.
  • Non-specific KCN opening agents show promise for symptomatic treatment of SCA13 and SCA19/22.
  • Developing specific KCN opening agents represents a significant future therapeutic strategy.