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Related Experiment Video

Updated: Mar 30, 2026

Creating a Structurally Realistic Finite Element Geometric Model of a Cardiomyocyte to Study the Role of Cellular Architecture in Cardiomyocyte Systems Biology
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An integrated finite element simulation of cardiomyocyte function based on triphasic theory.

Asuka Hatano1, Jun-Ichi Okada2, Takumi Washio2

  • 1Department of Mechanical Engineering, School of Engineering, The University of Tokyo Tokyo, Japan.

Frontiers in Physiology
|November 6, 2015
PubMed
Summary

Electrical potential gradients drive ion movement in heart cells, influencing excitation-contraction coupling. Fluid dynamics in t-tubules are crucial for ion exchange and maintaining calcium balance.

Keywords:
cardiomyocytefinite element methodmitochondriat-tubuletriphasic theory

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Area of Science:

  • Computational biology
  • Cardiac electrophysiology
  • Biophysics

Background:

  • Intracellular potential distribution and cytosol/ion mobility are often overlooked in cardiac simulations.
  • Intracellular electrical gradients, though small, significantly drive ion flux during depolarization.
  • T-tubule fluid dynamics are hypothesized to aid ion exchange with the extracellular space.

Purpose of the Study:

  • To investigate the significance of intracellular potential gradients and fluid dynamics in cardiac physiology.
  • To extend a finite element model based on triphasic theory to incorporate these factors.
  • To examine the role of t-tubule morphology and mitochondrial location in cardiomyocyte electrophysiology and mechanics.

Main Methods:

  • Utilized a finite element model based on triphasic theory.
  • Simulated detailed subcellular structures including myofibrils, mitochondria, sarcoplasmic reticulum, membranes, and t-tubules.
  • Incorporated mechanics and electrochemistry to study solids, fluids, and ions.

Main Results:

  • Predicted an electrical potential gradient within t-tubules during depolarization, correlating with Na(+) channel distribution.
  • Observed fluid ejection and suction between t-tubules and extracellular space during isometric contraction.
  • Demonstrated the importance of t-tubule structure for synchronized Ca(2+) release.

Conclusions:

  • T-tubule structure is critical for the synchrony of calcium release in cardiomyocytes.
  • Sub-sarcolemmal mitochondria may regulate intracellular calcium by counteracting surface sarcolemmal calcium influx.
  • These factors play a significant role in cardiac excitation-contraction coupling and maintaining intracellular calcium homeostasis.