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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 types of...
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Class I antiarrhythmic drugs are used to treat various types of arrhythmias or irregular heart rhythms. These drugs block the sodium (Na+) channels in the cardiac cells, thereby affecting the movement of electrical impulses across the heart. Class I antiarrhythmic drugs are divided into three subgroups: Class IA, Class IB, and Class IC, each with distinct mechanisms of action and effects on the heart.
Class 1A Antiarrhythmic Drugs: These drugs work by moderately blocking sodium channels,...
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The Role of Ion Channels in Neuronal Computation01:19

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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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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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Recapitulation of an Ion Channel IV Curve Using Frequency Components
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Introduction to sodium channels.

Colin H Peters1, Peter C Ruben

  • 1Department of Biomedical Physiology and Kinesiology, Simon Fraser University, Burnaby, BC, Canada, chpeters@sfu.ca.

Handbook of Experimental Pharmacology
|April 17, 2014
PubMed
Summary
This summary is machine-generated.

Voltage-gated sodium channels (VGSCs) are crucial for electrical signaling in cardiac and neuronal tissues. Understanding their structure and function is vital for treating diseases like epilepsy and arrhythmias.

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Area of Science:

  • Biophysics
  • Neuroscience
  • Cardiology

Background:

  • Voltage-gated sodium channels (VGSCs) are transmembrane proteins essential for electrical signal generation and propagation.
  • These channels are found in various tissues, notably cardiac and neuronal cells.
  • Their structure comprises four domains, each with six transmembrane segments, surrounding a central ion pore.

Purpose of the Study:

  • To provide a concise overview of VGSC structure, physiology, and pathophysiology.
  • To highlight the importance of studying VGSCs due to their role in critical physiological processes.
  • To introduce the relevance of VGSCs in various disease states.

Main Methods:

  • This review synthesizes existing knowledge on VGSCs.
  • It focuses on structural characteristics, electrophysiological properties, and disease associations.
  • No new experimental data were generated for this review.

Main Results:

  • VGSCs exhibit distinct activation, deactivation, and inactivation gating mechanisms in response to membrane potential changes.
  • The conserved structure of VGSCs facilitates their role in electrical excitability.
  • Dysfunction of VGSCs is linked to significant pathologies.

Conclusions:

  • VGSCs are fundamental to cellular electrophysiology in the human body.
  • Their structural and functional characteristics are key to their physiological roles.
  • Further research into VGSCs is critical for developing treatments for neurological and cardiac disorders.