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Related Concept Videos

Voltage-gated Ion Channels01:26

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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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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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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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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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Postganglionic sympathetic fibers (except those supplying the sweat glands) releasing noradrenaline or norepinephrine are called noradrenergic or adrenergic neurons. Noradrenaline, dopamine, adrenaline, or epinephrine are collectively called "catecholamines" as they contain a catechol moiety and an amine side chain. The five stages of neurotransmitter release involve their synthesis, storage, release, reuptake and metabolism.
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Updated: Feb 19, 2026

Voltage-Dependent Potassium Current Recording on H9c2 Cardiomyocytes via the Whole-Cell Patch-Clamp Technique
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Persistent Na-channels: origin and function. A review.

T Kiss1

  • 1Department of Experimental Zoology, Balaton Limnological Research Institute, Hungarian Academy of Sciences, Tihany, Hungary. kisst@tres.blki.hu

Acta Biologica Hungarica
|July 26, 2008
PubMed
Summary
This summary is machine-generated.

Persistent sodium currents, though small, significantly impact cell function by regulating membrane potential and neuronal firing. Their origin, whether from distinct channels or altered gating, remains a key question in channel research.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Biophysics

Background:

  • Voltage-dependent sodium channels are crucial for action potential generation.
  • These channels also produce a persistent sodium current, vital for subthreshold membrane potential regulation, dendritic depolarization, repetitive firing, and synaptic transmission.
  • The evolutionary origins of sodium channels suggest ancient conservation across invertebrates and vertebrates.

Purpose of the Study:

  • To review the origin and function of persistent sodium currents.
  • To explore the controversial mechanisms underlying persistent sodium current generation.
  • To focus on data from invertebrate models to understand sodium channel function.

Main Methods:

  • Literature review focusing on voltage-dependent sodium channels.
  • Analysis of biophysical properties and gene organization of sodium channels.
  • Comparative study of invertebrate and vertebrate sodium channel data.

Main Results:

  • Persistent sodium currents, while comprising a small fraction of the transient current, have significant physiological roles.
  • Invertebrate and vertebrate sodium channels share largely similar biophysical properties and gene organization, indicating an ancient origin.
  • The precise mechanism generating persistent sodium currents (distinct channels vs. altered gating) is still under investigation.

Conclusions:

  • Persistent sodium currents play a critical role in neuronal excitability and synaptic function.
  • Understanding the origin of persistent currents is essential for a complete picture of sodium channel physiology.
  • Invertebrate systems offer valuable insights into the fundamental mechanisms of voltage-dependent sodium channels.