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Related Concept Videos

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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The regulation of sodium and potassium ion concentrations in the human body is a complex process governed primarily by hormones such as aldosterone, antidiuretic hormone (ADH), and atrial natriuretic peptide (ANP).
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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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Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
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Related Experiment Video

Updated: Mar 15, 2026

Author Spotlight: Functional Site-Directed Fluorometry in Native Cells to Study Skeletal Muscle Excitability
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Developmental and Regulatory Functions of Na(+) Channel Non-pore-forming β Subunits.

J J Winters1, L L Isom2

  • 1University of Michigan Neuroscience Program, Ann Arbor, MI, United States.

Current Topics in Membranes
|September 3, 2016
PubMed
Summary
This summary is machine-generated.

Voltage-gated sodium channels (VGSCs) have crucial beta subunits that regulate their function and are vital for nervous system development. These beta subunits also play roles in cell adhesion and neuron development independently of VGSCs.

Keywords:
Axon initial segmentAxon pathfindingCardiac arrhythmiaCell adhesion moleculeCell migrationChannelomeDravet syndromeEpilepsyImmunoglobulin superfamilyNeurite outgrowthNodes of RanvierVoltage-gated ion channel

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cell Biology

Background:

  • Voltage-gated sodium channels (VGSCs) are essential for action potential initiation in excitable cells.
  • VGSCs comprise pore-forming alpha subunits and regulatory beta subunits.
  • VGSC beta subunits are type I glycoproteins with an immunoglobulin (Ig) domain, similar to neural cell adhesion molecules (CAMs).

Purpose of the Study:

  • To elucidate the multifaceted roles of VGSC beta subunits.
  • To understand their function in channel regulation and neural development.

Main Methods:

  • Analysis of VGSC subunit composition and topology.
  • Investigation of beta subunit gene family evolution.
  • Examination of beta subunit interactions with alpha subunits.
  • Assessment of beta subunit functions in cell migration and neurite outgrowth.

Main Results:

  • VGSC beta subunits are distinct from alpha subunits and emerged with vertebrates.
  • Beta subunits modulate VGSC surface expression, localization, and gating.
  • Beta subunits, like Ig-CAMs, influence cell migration, neurite outgrowth, and axon pathfinding, potentially independent of alpha subunits.

Conclusions:

  • VGSC beta subunits are critical regulators of ion channel function.
  • These subunits are multifunctional proteins essential for central nervous system development.
  • Their roles extend beyond channel modulation to include cell adhesion and neuronal guidance.