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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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Ligand-Gated Ion Channel Receptor: Gating Mechanism01:30

Ligand-Gated Ion Channel Receptor: Gating Mechanism

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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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The Role of Ion Channels in Neuronal Computation01:19

The Role of Ion Channels in Neuronal Computation

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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.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential....
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Non-gated Ion Channels01:24

Non-gated Ion Channels

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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.
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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Antiepileptic Drugs: Modulators of Neurotransmitter Release Mediated by SV2A Protein01:20

Antiepileptic Drugs: Modulators of Neurotransmitter Release Mediated by SV2A Protein

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Antiepileptic drugs, such as levetiracetam (Keppra) and brivaracetam (Briviact), have emerged as crucial tools in managing epilepsy. These medications exert their therapeutic effects by targeting the synaptic vesicle protein SV2A, a transmembrane glycoprotein primarily found in the brain.
SV2A is a transmembrane glycoprotein located predominantly in the brain, modulating the release of neurotransmitters for neuronal communication. Both levetiracetam and brivaracetam exhibit a high affinity for...
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Antiepileptic Drugs: Potassium Channel Activators01:20

Antiepileptic Drugs: Potassium Channel Activators

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Ezocgabine or retigabine, an antiepileptic drug of remarkable efficacy, has revolutionized the management of seizures. It is a potassium channel activator, explicitly targeting the family of Q subtype potassium channels. It enhances the transmembrane potassium currents, regulating neuronal excitability. This action stabilizes the resting membrane potential, a pivotal factor in mitigating the hyperexcitability that characterizes epilepsy.
Ezogabine has gained approval as an adjunctive treatment...
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Related Experiment Video

Updated: Oct 3, 2025

Vibrodissociation of Neurons from Rodent Brain Slices to Study Synaptic Transmission and Image Presynaptic Terminals
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Cannabidiol activates neuronal Kv7 channels.

Han-Xiong Bear Zhang1, Laurel Heckman2, Zachary Niday1

  • 1Department of Neurobiology, Harvard Medical School, Boston, United States.

Elife
|February 18, 2022
PubMed
Summary

Cannabidiol (CBD) enhances Kv7.2/7.3 channel activity, a potential mechanism for its antiepileptic effects. This finding sheds light on how CBD reduces neuronal hyperexcitability to treat epilepsy.

Keywords:
Dravet syndromeKv7.2M-currentcannabinoidsepilepsyhippocampusmouseneurosciencerat

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Study of the Functions and Activities of Neuronal K-Cl Co-Transporter KCC2 Using Western Blotting
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Exploring Arterial Smooth Muscle Kv7 Potassium Channel Function using Patch Clamp Electrophysiology and Pressure Myography
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Study of the Functions and Activities of Neuronal K-Cl Co-Transporter KCC2 Using Western Blotting
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Exploring Arterial Smooth Muscle Kv7 Potassium Channel Function using Patch Clamp Electrophysiology and Pressure Myography
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Exploring Arterial Smooth Muscle Kv7 Potassium Channel Function using Patch Clamp Electrophysiology and Pressure Myography

Published on: September 14, 2012

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Area of Science:

  • Neuroscience
  • Pharmacology
  • Molecular Biology

Background:

  • Cannabidiol (CBD) is an effective antiepileptic drug derived from *Cannabis sativa*.
  • The precise mechanism underlying CBD's therapeutic action remains largely unknown.
  • Kv7.2/7.3 channels are crucial for neuronal excitability and are targets for epilepsy treatment.

Purpose of the Study:

  • To investigate the molecular targets and mechanisms of action of Cannabidiol (CBD).
  • To determine if CBD modulates the function of human Kv7.2/7.3 potassium channels.
  • To explore the potential contribution of Kv7.2/7.3 channel modulation to CBD's antiepileptic properties.

Main Methods:

  • A large-scale fluorescence-based thallium flux assay was employed to screen for CBD's effects on heterologously expressed human Kv7.2/7.3 channels.
  • Patch-clamp electrophysiology was used to record channel currents and analyze voltage dependence.
  • Native M-currents in mouse superior cervical ganglion and rat hippocampal neurons were assessed.

Main Results:

  • Cannabidiol (CBD) was found to enhance ion flux through human Kv7.2/7.3 channels.
  • CBD shifted the voltage dependence of Kv7.2/7.3 channels in the hyperpolarizing direction at submicromolar concentrations.
  • CBD significantly enhanced native M-current in both mouse and rat neuronal preparations.

Conclusions:

  • CBD's potent enhancement of Kv7.2/7.3 channel activity provides a novel molecular mechanism for its antiepileptic efficacy.
  • Modulation of Kv7.2/7.3 channels by CBD may reduce neuronal hyperexcitability, contributing to seizure control.
  • These findings identify Kv7.2/7.3 channels as key targets for CBD's therapeutic effects in epilepsy.