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Related Concept Videos

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...
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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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Ligand-gated Ion Channels01:19

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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.
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Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
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A postsynaptic neuron usually receives numerous impulses from several other presynaptic neurons. The axon hillock of the postsynaptic neuron integrates all these signals and determines the likelihood of firing an action potential.
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Related Experiment Video

Updated: Sep 13, 2025

Determination of the Relative Cell Surface and Total Expression of Recombinant Ion Channels Using Flow Cytometry
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Brain Capillary Ion Channels: Physiology and Channelopathies.

Osama F Harraz1, Ahmed M Hashad1

  • 1Department of Pharmacology, Larner College of Medicine, Vermont Center for Cardiovascular and Brain HealthUniversity of Vermont Burlington Vermont.

Physiology (Bethesda, Md.)
|August 1, 2025
PubMed
Summary

Ion channels in brain capillaries are vital for regulating blood flow to neurons. Dysfunction in these channels contributes to neurological diseases, offering therapeutic targets.

Keywords:
brain capillariescerebral blood flowendothelial cellsion channelspericytes

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Area of Science:

  • Neuroscience
  • Vascular Biology
  • Cell Physiology

Background:

  • The brain requires a constant supply of oxygen and nutrients via its vascular network.
  • Functional hyperemia links brain blood flow to neuronal activity, a process crucial for cognitive function.
  • Ion channels in brain endothelial cells and pericytes play key roles in this neurovascular coupling.

Purpose of the Study:

  • To review the function of ion channels in brain capillary endothelial cells and pericytes.
  • To elucidate their role in regulating cerebral blood flow and neurovascular coupling.
  • To discuss the implications of ion channel dysfunction in neurological diseases.

Main Methods:

  • Literature review of studies on ion channels in brain microvasculature.
  • Analysis of the roles of specific ion channels (e.g., Kir2.1, KATP, TRPV4, TRPA1, Piezo1, VGCC, TRPC, TMEM16A) in endothelial cells and pericytes.
  • Examination of channelopathies associated with neurological disorders.

Main Results:

  • Endothelial ion channels regulate membrane potential and calcium signaling, influencing blood flow.
  • Pericyte ion channels control vascular contractility and blood flow responses.
  • Ion channel dysfunction is implicated in Alzheimer's disease, cerebral small vessel diseases, hypertension, and stroke.

Conclusions:

  • Ion channels in brain capillary endothelial cells and pericytes are critical regulators of neurovascular coupling.
  • Dysfunctional ion channels contribute to impaired cerebral blood flow in various neurological conditions.
  • Targeting these capillary ion channels presents a promising therapeutic strategy for brain disorders.