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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.
Ion channels are specialized integral membrane proteins on the plasma membrane that allow...
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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 types of...
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Electrochemical Gradient and Channel Proteins: An Overview01:21

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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...
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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.
Three Subfamilies of Ligand-gated Ion Channels
Ligand-gated ion channels fall into three subfamilies. The 'Cys-loop' includes the nicotinic acetylcholine receptors, γ-aminobutyric acid (GABA), glycine, and 5-hydroxytryptamine receptors. The second one is the 'Pore-loop' channels that...
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G-Protein Gated Ion Channels01:21

G-Protein Gated Ion Channels

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GPCRs are primarily responsible for our sense of smell, taste, and vision.  The binding of a sensory stimulus activates GPCR to stimulate effector proteins, many of which are ion channels in the sensory organs. GPCRs modulate the opening and closing of the target ion channels either directly by binding them, or by releasing second messengers that activate these channels. As ions move across the membrane, the membrane potential is altered, which induces an appropriate response.
Sensory...
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Mechanical transduction by ion channels: A cautionary tale.

Frederick Sachs1

  • 1UB School of Medicine and Biomedical Sciences, Physiology and Biophysics, Buffalo, NY 14214, United States.

World Journal of Neurology
|January 13, 2017
PubMed
Summary

Mechanosensitive ion channels (MSCs) in all cells, including red blood cells, respond to mechanical stress and play roles in sensation and organ function. A novel peptide, GsMtx4, offers a new therapeutic approach for stress-related pathologies.

Keywords:
BilayerBiomechanicsChannelDomainForceMechanicalOsmoticPatchTensionTransduction

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Area of Science:

  • Cell Biology
  • Biophysics
  • Neuroscience

Background:

  • Mechanical forces are sensed by mechanosensitive ion channels (MSCs) present in all cell types.
  • These channels are crucial for sensory functions (hearing, touch), proprioception, and autonomic system regulation.
  • Cationic MSCs, typically inactive under normal conditions, open during pathological stress and are blocked by GsMtx4.

Purpose of the Study:

  • To provide a guide for new investigators studying mechanosensitive ion channels.
  • To highlight the technology, potential artifacts, and fundamental mechanics involved in MSC research.
  • To address the challenge of determining the precise force applied to MSCs.

Main Methods:

  • Review of existing literature on mechanosensitive ion channels.
  • Discussion of experimental challenges, including force application and measurement.
  • Introduction of GsMtx4 as a specific blocker for cationic MSCs.

Main Results:

  • Cationic MSCs act as 'fire alarms,' signaling excessive bilayer tension.
  • GsMtx4 is a novel, non-toxic, and stable therapeutic agent for stress-related pathologies.
  • Significant challenges remain in precisely quantifying the mechanical forces acting on MSCs.

Conclusions:

  • Mechanosensitive ion channels are vital cellular components with diverse physiological roles.
  • GsMtx4 represents a promising therapeutic strategy for conditions involving excessive mechanical stress.
  • Further research is needed to overcome technical hurdles in studying MSCs and their mechanical stimuli.