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Related Concept Videos

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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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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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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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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Related Experiment Video

Updated: Jan 18, 2026

Isolation and Kv Channel Recordings in Murine Atrial and Ventricular Cardiomyocytes
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Isolation and Kv Channel Recordings in Murine Atrial and Ventricular Cardiomyocytes

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KChIP1 splice variants modulate Kv4 channels by promoting P/C-type inactivation features.

Wuyou Cao1, Georgios Tachtsidis1, Robert Bähring2

  • 1Institut für Zelluläre und Integrative Physiologie, Zentrum für Experimentelle Medizin, Universitätsklinikum Hamburg-Eppendorf, 20246, Hamburg, Germany.

Scientific Reports
|January 16, 2026
PubMed
Summary

Two KChIP1 splice variants modulate Kv4 potassium channels, influencing neuronal excitability. KChIP1b variant significantly slows channel recovery, impacting repetitive firing and suggesting a role for alternative splicing in neuronal function.

Keywords:
Xenopus oocytesA-type currentExponential fittingRecovery from inactivationRepetitive firingTwo-electrode voltage-clamp

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Biophysics

Background:

  • Kv4 channels are crucial for somatodendritic A-type potassium currents, regulating neuronal excitability and firing patterns.
  • Kv4 channels form complexes with auxiliary subunits, including DPPs and KChIPs, which modulate channel gating kinetics, particularly recovery from inactivation.

Purpose of the Study:

  • To investigate the concerted modulatory effects of two KChIP1 splice variants (1a and 1b) on various Kv4 channel subtypes.
  • To examine these effects in both binary (Kv4 + KChIP1) and ternary (Kv4 + DPP + KChIP1) channel configurations.

Main Methods:

  • Two-electrode voltage-clamp electrophysiology in Xenopus oocytes.
  • Co-expression of Kv4.1, Kv4.2, Kv4.3S, and Kv4.3L channels with KChIP1 splice variants and DPP.

Main Results:

  • Co-expression of either KChIP1 splice variant introduced a slow component in Kv4 channel recovery from inactivation, persisting in ternary complexes.
  • KChIP1b exhibited a stronger effect than KChIP1a, suggesting functional implications of alternative splicing.
  • Ternary Kv4.2 + DPP + KChIP1b channels showed enhanced P/C-type inactivation and preferential closed-state inactivation.

Conclusions:

  • KChIP1 splice variants significantly alter Kv4 channel gating, particularly recovery from inactivation.
  • Alternative splicing of KChIP1, especially KChIP1b, can limit the fast repetitive availability of the somatodendritic A-type current.
  • The findings highlight the complex modulation of Kv4 channels by auxiliary subunits and alternative splicing, impacting neuronal firing properties.