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Intercellular coupling through gap junctions masks M cells in the human heart.

Chantal E Conrath1, Ronald Wilders, Ruben Coronel

  • 1Department of Medical Physiology, University Medical Center, Utrecht, The Netherlands. c.e.conrath@med.uu.nl

Cardiovascular Research
|April 20, 2004
PubMed
Summary

M cells, implicated in cardiac arrhythmias, do not appear to manifest in the human heart. Effective intercellular coupling likely renders these cells functionally "invisible," preventing their contribution to abnormal heart rhythms.

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Area of Science:

  • Cardiovascular Physiology
  • Computational Biology
  • Electrophysiology

Background:

  • M cells are theorized to contribute to cardiac electrical abnormalities like long QT intervals and dispersion in action potential duration.
  • Their presence and functional significance in the human heart remain debated.

Purpose of the Study:

  • To investigate the role and manifestation of M cells in human ventricular myocardium.
  • To determine if M cells contribute to abnormal cardiac repolarization in the human heart.

Main Methods:

  • Simulated action potential propagation in human ventricular myocyte models, varying M cell presence and intercellular coupling.
  • Assessed action potential duration in explanted human heart preparations (Langendorff-perfused and wedge).

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Main Results:

  • Simulations with M cells at low intercellular coupling showed significantly prolonged 'QT intervals' and unphysiologically large dispersion of repolarization time compared to human data.
  • These effects were abolished at stronger intercellular coupling levels.

Conclusions:

  • M cells do not appear to manifest functionally in the human heart.
  • Effective intercellular coupling likely makes M cells functionally
  • invisible
  • in the human myocardium.