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Related Experiment Videos

Developmental changes in ionic channel activity in the embryonic murine heart

M P Davies1, R H An, P Doevendans

  • 1Department of Physiology, University of Rochester School of Medicine and Dentistry, NY 14642, USA.

Circulation Research
|January 1, 1996
PubMed
Summary

Ionic channel expression in developing mouse hearts changes significantly. Early development relies on calcium channels, with sodium channels increasing before birth, while ATP-regulated potassium channels are consistently present.

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Area of Science:

  • Cardiovascular Biology
  • Developmental Biology
  • Molecular Physiology

Background:

  • Cardiac ion channels are crucial for heart function.
  • Understanding their developmental changes is key to cardiac physiology.
  • Limited data exists on ion channel expression during fetal mouse heart development.

Purpose of the Study:

  • To investigate age- and chamber-specific expression of ionic channels in the developing fetal mouse heart.
  • To elucidate the role of different ion channels during cardiac embryogenesis.
  • To establish a baseline for future studies on ion channel development in genetically modified mice.

Main Methods:

  • Isolation of murine embryonic atrial and ventricular cells.
  • Patch-clamp electrophysiological recordings.

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  • Analysis of ion channel activity during different embryonic stages.

    • Main Results:

    • L-type Ca2+ channels dominate early cardiac excitation.
    • Na+ channel expression significantly increases just before birth.
    • K+ channel expression shows developmental sensitivity; ATP-regulated K+ channels are robustly expressed throughout development, suggesting a novel role in morphogenesis.
    • Slowly activating delayed rectifier (IKs) and inwardly rectifying channels appear late in embryogenesis.

    Conclusions:

    • Ion channel expression is dynamically regulated during fetal mouse heart development.
    • ATP-regulated K+ channels may have a significant, previously unrecognized role in cardiac morphogenesis.
    • These findings provide critical insights into the developing murine cardiac conduction system.