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Potassium Currents Activated by Depolarization in Odontoblasts.

Yuki Kojima1, Maki Kimura1, Asuka Higashikawa1

  • 1Department of Physiology, Tokyo Dental College, Tokyo, Japan.

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|January 10, 2018
PubMed
Summary

This study reveals that voltage-dependent potassium (Kv) channels in odontoblasts are crucial for dentin formation. Inhibiting these channels, like Kv1.1, 1.2, and 1.6, significantly reduces mineralization efficiency in human odontoblasts.

Keywords:
K+ channelsKv channelsdentinogenesisodontoblastoutward currentspatch-clamp recordings

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Area of Science:

  • Biophysics
  • Cell Physiology
  • Dental Research

Background:

  • Intracellular calcium (Ca2+) increases trigger plasma membrane depolarization and activate potassium (K+) currents.
  • The specific characteristics of depolarization-activated K+ currents in odontoblasts require further investigation.

Purpose of the Study:

  • To characterize the biophysical and pharmacological properties of K+ currents in rat odontoblasts.
  • To investigate the role of voltage-dependent K+ (Kv) channels in odontoblast mineralization.

Main Methods:

  • Patch-clamp recordings in whole-cell configuration were used to study K+ currents in rat odontoblasts.
  • Pharmacological agents (tetraethylammonium chloride, 4-aminopyridine, α-dendrotoxin) were employed to identify Kv channel subtypes.
  • Mineralization assays (alizarin red, von Kossa staining) were performed on human odontoblasts treated with tetraethylammonium chloride.

Main Results:

  • Time- and voltage-dependent outward currents were identified and characterized.
  • Pharmacological profiling suggested the presence of Kv1.1, Kv1.2, and/or Kv1.6 channel subtypes.
  • Inhibition of Kv channels with tetraethylammonium chloride dose-dependently decreased mineralization in human odontoblasts.

Conclusions:

  • Rat odontoblasts express functional voltage-dependent K+ channels, likely including Kv1.1, 1.2, and/or 1.6 subtypes.
  • These Kv channels play a significant role in the mineralization process during dentin formation.