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Related Experiment Videos

Delayed rectifier K+ current in embryonic chick heart ventricle.

D E Clapham1, D E Logothetis

  • 1Cardiovascular Division, Brigham and Women's Hospital, Boston, Massachusetts.

The American Journal of Physiology
|January 1, 1988
PubMed
Summary
This summary is machine-generated.

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Researchers identified the specific potassium channel responsible for the delayed rectifier current (IK) in embryonic chick ventricular cells. This finding clarifies a key repolarization mechanism in the heart.

Area of Science:

  • Cardiology
  • Electrophysiology
  • Molecular Biology

Background:

  • The delayed rectifier potassium current (IK) is crucial for cardiac repolarization.
  • Understanding the molecular basis of IK is essential for comprehending cardiac electrical activity.

Purpose of the Study:

  • To characterize the biophysical and pharmacological properties of the delayed rectifier current (IK) in embryonic chick ventricular cells.
  • To identify the single-channel properties underlying the macroscopic IK.

Main Methods:

  • Whole-cell, outside-out, and cell-attached patch-clamp electrophysiology.
  • Voltage-clamp analysis of ionic currents.
  • Single-channel recordings and analysis.

Main Results:

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  • The delayed rectifier current (IK) activated at potentials above -25 mV and was K+-selective.
  • A 15-pS K+-selective channel was identified, and its ensemble average reproduced the whole-cell IK.
  • The current was blocked by cesium, 4-aminopyridine, tetraethylammonium chloride, and barium chloride.

Conclusions:

  • A specific K+ channel underlying the main delayed rectifier current in chick ventricle has been identified.
  • This channel plays a significant role in cardiac repolarization.