Potassium and chloride channels in freshly isolated rat odontoblasts

Research output: Contribution to journalArticle

Abstract

It has been suggested that understanding the physiological properties of odontoblasts may be important in understanding the mechanisms underlying both metabolic and transductive processes in dental pulp. Because ion flux(es) may play a critical role in these events, it is of particular interest to understand ionic mechanisms in odontoblast cells. Thus, the aim of this study was to use patch-clamp recording techniques to examine the properties of resident ion channels in freshly dissociated odontoblasts. In recordings made in potassium-rich solutions, cells displayed at least three distinct channel amplitudes, with conductances of 130 ± 18 pS, 52 ± 4 pS, and 25 ± 2 pS, respectively. Channel activity persisted in the presence of potassium salts of impermeant anions, and could be abolished by barium, a non-specific potassium channel blocker. In addition to the potassium conductances, we saw two separate anion channels in the odontoblast membrane. These channels were predominantly chloride-selective, weakly permeable to both acetate and aspartate, and had conductances of 391 ± 64 pS and 24 ± 3 pS. While questions remain regarding the functional role of these and other ion channels that presumably reside in the odontoblast membrane, our results demonstrate that it is possible to study ionic mechanisms of the odontoblast at the level of the single cell.

Original languageEnglish (US)
Pages (from-to)341-350
Number of pages10
JournalJournal of Dental Research
Volume77
Issue number2
StatePublished - 1998

Fingerprint

Odontoblasts
Chloride Channels
Potassium Chloride
Potassium Channels
Potassium
Ion Channels
Anions
Potassium Channel Blockers
Dental Pulp
Membranes
Patch-Clamp Techniques
Barium
Aspartic Acid
Chlorides
Acetates
Salts
Ions

Keywords

  • Chloride channel
  • Odontoblast
  • Potassium channel

ASJC Scopus subject areas

  • Dentistry(all)

Cite this

Potassium and chloride channels in freshly isolated rat odontoblasts. / Guo, L.; Davidson, Robert.

In: Journal of Dental Research, Vol. 77, No. 2, 1998, p. 341-350.

Research output: Contribution to journalArticle

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