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Developmental changes in transient outward current in mouse ventricle

L Wang1, H J Duff

  • 1Department of Medicine, University of Calgary, Alberta, Canada.

Circulation Research
|July 1, 1997
PubMed
Summary
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The density of the transient outward K+ current (Ito) increases significantly in mouse heart cells during development. This developmental increase in Ito contributes to shorter action potential duration in adult hearts.

Area of Science:

  • Cardiology
  • Electrophysiology
  • Developmental Biology

Background:

  • The transient outward K+ current (Ito) plays a crucial role in cardiac repolarization.
  • Understanding developmental changes in Ito is essential for comprehending age-related alterations in heart function.

Purpose of the Study:

  • To investigate the developmental changes in the biophysical properties and density of Ito in mouse ventricular myocytes.
  • To determine the contribution of Ito to the developmental shortening of action potential duration in the mouse heart.

Main Methods:

  • Whole-cell patch-clamp technique to measure Ito in neonatal and adult mouse ventricular myocytes.
  • Microelectrode studies to assess action potential duration.
  • Pharmacological manipulation with 4-aminopyridine to probe Ito's role.

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Main Results:

  • Ito density significantly increased from day-1 neonate to adult mouse ventricular myocytes.
  • Ito inactivation kinetics slowed, and steady-state inactivation properties shifted during development.
  • Action potential duration progressively decreased with postnatal development, correlating with increased Ito.

Conclusions:

  • Developmental changes in mouse ventricular Ito include increased density and altered kinetics.
  • The developmental increase in Ito contributes significantly to the shortening of action potential duration in adult mouse hearts.
  • Ito is a more critical repolarizing current in adult than in neonatal mouse hearts.