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Related Experiment Videos

Ca(2+)-activated Cl(-) current in rabbit sinoatrial node cells.

Arie O Verkerk1, Ronald Wilders, Jan G Zegers

  • 1Academic Medical Center, University of Amsterdam, Task Force Heart Failure and Aging, Department of Physiology, Meibergdreef 15, 1105 AZ Amsterdam, The Netherlands. A.O.Verkerk@amc.uva.nl

The Journal of Physiology
|April 3, 2002
PubMed
Summary
This summary is machine-generated.

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Calcium-activated chloride current (I(Cl(Ca))) exists in some sinoatrial node cells, influencing action potential duration but not heart rate or synchronization. This finding clarifies the role of I(Cl(Ca)) in cardiac electrophysiology.

Area of Science:

  • Cardiac Electrophysiology
  • Ion Channels
  • Cell Physiology

Background:

  • The Ca(2+)-activated Cl(-) current (I(Cl(Ca))) is known in various cardiac cells, impacting repolarization and after-depolarizations.
  • The presence and function of I(Cl(Ca)) in sinoatrial (SA) node cells, crucial for heart rhythm, remained uncharacterized.

Purpose of the Study:

  • To investigate the existence and functional significance of I(Cl(Ca)) in rabbit SA node cells.
  • To determine the role of I(Cl(Ca)) in modulating SA node electrical activity and action potential characteristics.

Main Methods:

  • Utilized perforated patch-clamp electrophysiology to record ionic currents in isolated rabbit SA node cells.
  • Employed voltage and current clamp techniques, along with action potential clamp, to assess I(Cl(Ca)) properties.

Related Experiment Videos

  • Integrated computer simulations to further elucidate the functional role of I(Cl(Ca)) in SA node physiology.

    • Main Results:

    • I(Cl(Ca)) was detected in approximately one-third of spontaneously active SA node cells, exhibiting transient outward kinetics.
    • Noradrenaline stimulation significantly increased I(Cl(Ca)) density, and its blockade prolonged action potential duration at 20% repolarization.
    • I(Cl(Ca)) blockade did not affect intrinsic heart rate, upstroke velocity, diastolic depolarization rate, or later phases of action potential duration.

    Conclusions:

    • I(Cl(Ca)) is present and activated during the cardiac cycle in a subset of SA node cells.
    • While I(Cl(Ca)) influences action potential repolarization, it does not appear to regulate intrinsic heart rate, pacemaker synchronization, or conduction.