Swelling activated chloride currents in the electrical activity of pulmonary vein cardiomyocytes

S. H. Lee, Y. C. Chen, S. Y. Chen, C. I. Lin, Y. J. Chen, S. A. Chen

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Background: Pulmonary veins (PVs) contain cardiomyocytes with a high arrhythmogenicity for inducing atrial fibrillation. The swelling-activated outwardly rectifying Cl - currents (I Cl,swell) are important in the electrical activity of cardiomyocytes. This study was to investigate whether I Cl,swell play a role in the PV electrophysiological characteristics. Materials and methods: A whole-cell patch clamp was used to investigate the action potentials and I Cl,swell in isolated rabbit single PV and atrial cardiomyocytes during immersion in isotonic (290-300 mosm L -1) and hypotonic (220-230 mosm L -1) solutions. The cell length and cell width were measured using confocal microscopy. Results: Hypotonic solution induced larger I Cl,swell in the PV cardiomyocytes with pacemaker activity than those in the PV cardiomyocytes without pacemaker activity or atrial cardiomyocytes. Hypotonic solution shortened the action potential duration and increased the cell width to a greater extent in the PV cardiomyocytes than in the atrial cardiomyocytes. Moreover, hypotonic solution decreased the PV firing with a decrease in the transient inward currents and delayed after depolarizations. Conclusions: These findings suggest that the I Cl,swell plays an important role in the electrical activity of the PV cardiomyocytes.

Original languageEnglish
Pages (from-to)17-23
Number of pages7
JournalEuropean Journal of Clinical Investigation
Volume38
Issue number1
DOIs
Publication statusPublished - Jan 2008

Fingerprint

Hypotonic Solutions
Pulmonary Veins
Cardiac Myocytes
Swelling
Chlorides
Pacemakers
Confocal microscopy
Depolarization
Clamping devices
Action Potentials
Immersion
Confocal Microscopy
Atrial Fibrillation
Rabbits

Keywords

  • Atrial fibrillation
  • Hyposmolarity
  • Pulmonary vein
  • Swelling activated chloride currents

ASJC Scopus subject areas

  • Medicine(all)

Cite this

Swelling activated chloride currents in the electrical activity of pulmonary vein cardiomyocytes. / Lee, S. H.; Chen, Y. C.; Chen, S. Y.; Lin, C. I.; Chen, Y. J.; Chen, S. A.

In: European Journal of Clinical Investigation, Vol. 38, No. 1, 01.2008, p. 17-23.

Research output: Contribution to journalArticle

Lee, S. H. ; Chen, Y. C. ; Chen, S. Y. ; Lin, C. I. ; Chen, Y. J. ; Chen, S. A. / Swelling activated chloride currents in the electrical activity of pulmonary vein cardiomyocytes. In: European Journal of Clinical Investigation. 2008 ; Vol. 38, No. 1. pp. 17-23.
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