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Related Concept Videos

Mechanically-gated Ion Channels01:12

Mechanically-gated Ion Channels

Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...
Mechanically-gated Ion Channels01:12

Mechanically-gated Ion Channels

Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...
Voltage-gated Ion Channels01:26

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 Channels01:26

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 Channels01:24

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 Channels01:24

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: Jun 16, 2026

Patch Clamp and Perfusion Techniques for Studying Ion Channels Expressed in Xenopus oocytes
10:19

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

Published on: January 10, 2011

Stretch-activated ion channels: what are they?

Frederick Sachs1

  • 1State University of New York, Buffalo, New York, USA. sachs@buffalo.edu

Physiology (Bethesda, Md.)
|February 6, 2010
PubMed
Summary

Mechanosensitive ion channels (MSCs) are found in all cells and respond to local membrane stress. Understanding the diverse mechanical stimuli is key to deciphering MSC function.

Area of Science:

  • Cell Biology
  • Biophysics

Background:

  • Mechanosensitive ion channels (MSCs) are ubiquitous in cells, but their sensitivity is a functional phenotype, not a fixed genetic trait.
  • Specialized mechanoreceptors, like cochlear hair cells, utilize complex mechanical impedance matching for stress coupling.
  • In contrast, MSCs in non-specialized cells are activated by local membrane bilayer stress, typically within a few lipid molecules.

Purpose of the Study:

  • To elucidate the mechanisms by which mechanosensitive ion channels (MSCs) are activated by mechanical stimuli in non-specialized cells.
  • To differentiate the activation pathways of MSCs in specialized sensory cells versus general cellular contexts.

Main Methods:

  • Review of existing literature on mechanosensitive ion channel activation.
  • Analysis of biophysical models describing membrane mechanics and ion channel gating.

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Recapitulation of an Ion Channel IV Curve Using Frequency Components
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Recapitulation of an Ion Channel IV Curve Using Frequency Components

Published on: February 8, 2011

One-channel Cell-attached Patch-clamp Recording
13:07

One-channel Cell-attached Patch-clamp Recording

Published on: June 9, 2014

Related Experiment Videos

Last Updated: Jun 16, 2026

Patch Clamp and Perfusion Techniques for Studying Ion Channels Expressed in Xenopus oocytes
10:19

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

Published on: January 10, 2011

Recapitulation of an Ion Channel IV Curve Using Frequency Components
10:14

Recapitulation of an Ion Channel IV Curve Using Frequency Components

Published on: February 8, 2011

One-channel Cell-attached Patch-clamp Recording
13:07

One-channel Cell-attached Patch-clamp Recording

Published on: June 9, 2014

  • Identification of various sources of local mechanical stress relevant to MSCs.

    • Main Results:

    • Mechanosensitivity in non-specialized cells is primarily driven by local membrane stress, affecting lipids near the channel.
    • Diverse mechanical forces, including tension, amphipaths, phase separations, cytoskeletal interactions, extracellular matrix, and pipette adhesion, can generate this local stress.
    • The specific stimulus dictates the activation of MSCs, highlighting the context-dependent nature of their function.

    Conclusions:

    • Understanding the diverse mechanical stimuli is crucial for comprehending mechanosensitive ion channel function across different cell types.
    • The local nature of the stimulus in non-specialized cells contrasts with the more complex coupling mechanisms in specialized mechanoreceptors.
    • Further research into the precise relationship between specific mechanical forces and MSC gating is warranted.