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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.
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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-gated Ion Channels01:12

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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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Updated: Mar 22, 2026

Voltage-Dependent Potassium Current Recording on H9c2 Cardiomyocytes via the Whole-Cell Patch-Clamp Technique
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Vascular potassium channels in NVC.

K Yamada1

  • 1Hirosaki University Graduate School of Medicine, Hirosaki, Aomori, Japan.

Progress in Brain Research
|May 1, 2016
PubMed
Summary

External potassium ions (K(+)) regulate cerebral blood flow. Mild elevations cause vasodilation by hyperpolarizing smooth muscle, while large increases trigger vasoconstriction, impacting brain function during events like stroke.

Keywords:
AstrocyteBK channelCerebral blood flowFunctional hyperemiaInward rectifierKATP channelNeurovascular couplingSmooth muscle cell

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Area of Science:

  • Neuroscience
  • Cerebrovascular Physiology
  • Cellular Electrophysiology

Background:

  • The role of external potassium ions ([K(+)]0) in regulating local cerebral blood flow is a long-standing hypothesis.
  • Astrocytes are implicated in modulating [K(+)]0 via calcium-activated potassium channels, responding to neuronal activity.

Purpose of the Study:

  • To elucidate the mechanisms by which external potassium ions influence cerebral vascular tone.
  • To investigate the differential effects of mild versus severe [K(+)]0 elevations on cerebral blood flow regulation.

Main Methods:

  • The study proposes mechanisms involving astrocyte calcium-activated potassium channels and vascular smooth muscle ion channels (Na(+)/K(+)-ATPase, inwardly rectifying potassium channels).

Main Results:

  • Mild [K(+)]0 elevations in perivascular spaces may lead to vascular smooth muscle hyperpolarization and vasodilation via Na(+)/K(+)-ATPase and inwardly rectifying potassium channels.
  • Endothelial ion channels may also contribute to potassium-mediated hyperpolarization and vasodilation.
  • Pathophysiological elevations of [K(+)]0, as seen in spreading depression or stroke, can induce vascular smooth muscle depolarization and vasoconstriction.

Conclusions:

  • External potassium ions play a dual role in cerebral blood flow regulation, mediating vasodilation at mild concentrations and vasoconstriction at higher, pathological levels.
  • Understanding these [K(+)]0 dynamics is crucial for comprehending cerebral blood flow control and neurological conditions.