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Related Concept Videos

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.
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Voltage-gated Ion Channels01:26

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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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Voltage-gated Ion Channels01:26

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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.
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Ligand-Gated Ion Channel Receptor: Gating Mechanism01:30

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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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Site Directed Spin Labeling and EPR Spectroscopic Studies of Pentameric Ligand-Gated Ion Channels
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Na+ channel function, regulation, structure, trafficking and sequestration.

Ye Chen-Izu1, Robin M Shaw, Geoffrey S Pitt

  • 1Department of Pharmacology, University of California, Davis, USA; Department of Biomedical Engineering, University of California, Davis, USA; Department of Internal Medicine/Cardiology, University of California, Davis, USA.

The Journal of Physiology
|March 17, 2015
PubMed
Summary
This summary is machine-generated.

This review examines sodium channel function, structure, and regulation in the heart. It explores how sodium transport impacts cardiac excitation-contraction coupling and arrhythmias, crucial for cardiovascular health.

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Area of Science:

  • Cardiovascular Science
  • Molecular Cardiology
  • Electrophysiology

Background:

  • Cardiac excitation-contraction coupling is vital for heart function.
  • Arrhythmias can arise from disruptions in cardiac ion transport.
  • Sodium ions play a critical role in cardiac electrophysiology.

Purpose of the Study:

  • To review the function, structure, and regulation of cardiac sodium channels.
  • To discuss the trafficking, sequestration, and complexing of sodium channels.
  • To synthesize current understanding of sodium's role in cardiac excitation-contraction coupling and arrhythmias.

Main Methods:

  • Literature review of recent research on cardiac sodium channels.
  • Synthesis of findings from the University of California Davis Cardiovascular Symposium 2014.
  • Analysis of consensus and controversy regarding sodium's role in cardiac function.

Main Results:

  • Detailed overview of sodium channel structure-function relationships.
  • Insights into the regulation of sodium channel activity.
  • Understanding of sodium channel dynamics including trafficking and complexing.

Conclusions:

  • Sodium channels are key determinants of cardiac electrical activity.
  • Dysregulation of sodium channels contributes to arrhythmias.
  • A systems approach is essential for understanding cardiac electrophysiology and developing targeted therapies.