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Ion Channels

Ion Channels

The movement of ions like sodium, potassium, and calcium into and out of the cell is essential to maintain the electrochemical gradient in living cells. The ion channels—a class of membrane transport proteins—help maintain this ionic gradient for the smooth functioning of physiological activities such as maintaining cell size and volume, conducting nerve impulses, and gas and nutrient exchange.
Ion channels are specialized integral membrane proteins on the plasma membrane that allow specific...

Electrochemical Gradient and Channel Proteins: An Overview

Electrochemical Gradient and Channel Proteins: An Overview

An electrochemical gradient is a fundamental concept in biology and chemistry. It regulates the movement of ions across cell membranes. This movement is influenced by two factors:
The electrical gradient: The electrical gradient across cell membranes refers to the difference in electric charge between the inside and outside of a cell. This difference drives the movement of ions towards or away from the cells. For instance, if the inside of the cell is more negatively charged relative to the...

Voltage-gated Ion Channels

Voltage-gated Ion Channels

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 types of...

Voltage-gated Ion Channels

Voltage-gated Ion Channels

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 types of...

Non-gated Ion Channels

Non-gated Ion Channels

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.

Non-gated Ion Channels

Non-gated Ion Channels

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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Related Experiment Video

Updated: Jul 15, 2026

Patch Clamp and Perfusion Techniques for Studying Ion Channels Expressed in Xenopus oocytes

Patch Clamp and Perfusion Techniques for Studying Ion Channels Expressed in Xenopus oocytes

Published on: January 10, 2011

SK channels are on the move.

V Seutin¹, J-F Liégeois

¹Laboratory of Pharmacology and Research Center for Cellular and Molecular Neurobiology, University of Liège, Liège, Belgium. V.Seutin@ulg.ac.be

British Journal of Pharmacology

|May 9, 2007

Summary

Researchers discovered a novel positive modulator for small-conductance calcium-activated potassium (SK) channels. This compound shows selectivity for SK channels and specific subtypes, offering new tools for central nervous system drug development.

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Area of Science:

Neuroscience
Molecular Biology
Pharmacology

Background:

Small-conductance calcium-activated potassium (SK) channels are crucial for neuronal excitability.
Three SK channel subtypes (SK1, SK2, SK3) are differentially expressed in the central nervous system (CNS).

Purpose of the Study:

To report the discovery of the first positive modulator with selectivity for SK channels.
To investigate subtype selectivity among SK channels (SK3>SK2>>>SK1=IK).

Main Methods:

Discovery of a novel positive modulator.
Electrophysiological and pharmacological characterization of channel activity.

Main Results:

Identified a positive modulator selective for SK channels over other ion channels.
Demonstrated subtype selectivity, with potentiation favoring SK3 > SK2 >> SK1 channels.

Conclusions:

The novel modulator represents a valuable tool for studying SK channel function.
This discovery advances the potential of SK channels as therapeutic targets for CNS disorders.