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Related Concept Videos

Mechanically-gated Ion Channels01:12

Mechanically-gated Ion Channels

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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...
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Ion Channels01:19

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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.
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Voltage-gated Ion Channels01:26

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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.
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Non-gated Ion Channels01:24

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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.
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Mechanically Activated Ion Channels.

Sanjeev S Ranade1, Ruhma Syeda1, Ardem Patapoutian1

  • 1Howard Hughes Medical Institute, Molecular and Cellular Neuroscience, Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA.

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|September 25, 2015
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Summary

Mechanotransduction relies on mechanically activated (MA) ion channels to convert physical forces into biochemical signals. Recent discoveries are advancing our understanding of touch and hearing mechanisms.

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Area of Science:

  • Physiology
  • Molecular Biology
  • Biophysics

Background:

  • Mechanotransduction is vital for sensory perception (touch, hearing) and physiological regulation (blood flow).
  • Mechanically activated (MA) ion channels are hypothesized sensors, but their identities and mechanisms were unclear.
  • Previous research identified novel MA channels, transforming the understanding of mechanosensation.

Purpose of the Study:

  • To review eukaryotic ion channel families involved in mechanotransduction.
  • To evaluate candidate genes for MA channel function based on specific criteria.
  • To discuss MA ion channel gating models and structural studies.

Main Methods:

  • Literature review of eukaryotic ion channel families.
  • Evaluation of candidate genes implicated in mechanotransduction.
  • Analysis of proposed gating models and structural data for MA ion channels.

Main Results:

  • Identification and evaluation of various eukaryotic ion channel families in mechanotransduction.
  • Discussion of criteria for qualifying candidate MA ion channels.
  • Overview of current knowledge on MA ion channel gating mechanisms and structures.

Conclusions:

  • Significant progress has been made in identifying and characterizing MA ion channels.
  • Understanding these channels is crucial for elucidating sensory processes like touch and hearing.
  • Further research into gating models and structural biology will deepen insights into mechanotransduction.