A novel acid-sensitive K + channel in rat dorsal root ganglia neurons

Jun Ho La, Dawon Kang, Jae-Yong Park, Seong Geun Hong, Jaehee Han

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Recent studies have suggested that acid-sensitive background K + channels such as TASK-1 and TASK-3, members of two-pore domain K + (K 2P ) channel family, express and contribute to extracellular acidification-induced responses in dorsal root ganglia (DRG) neurons. However, it has remained to address whether other acid-sensitive background K + channels are functionally expressed in DRG neurons. Here we characterized biophysical and pharmacological properties of a novel acid-sensitive background K + channel in DRG neurons isolated from neonatal rats. We recorded an 80-pS K + channel with a weak inward rectification current-voltage relationship in cell-attached patches in 150 mM KCl bath solution. The 80-pS K + channel was inhibited by extracellular low pH (pH o 6.3). Interestingly, the channel was similar to TASK-2 cloned from mouse and rat in biophysical and pharmacological properties. However, extracellular alkaline condition which activates TASK-2 channel, failed to activate the 80-pS K + channel. Lidocaine and quinine more inhibited the channel activity of 80-pS K + channel than that of TASK-2 channel. Our results suggest that the acid-sensitive 80-pS K + channels may regulate resting membrane potential and may play a critical role in various processes such as cell metabolism, pH, and pain sensation in DRG neurons.

Original languageEnglish
Pages (from-to)244-249
Number of pages6
JournalNeuroscience Letters
Volume406
Issue number3
DOIs
Publication statusPublished - 2006 Oct 9
Externally publishedYes

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Keywords

  • Acid-sensitive channel
  • Background K channels
  • Dorsal root ganglion neurons
  • TASK-2

ASJC Scopus subject areas

  • Neuroscience(all)

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