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Related Concept Videos

Cardiac Action Potential01:30

Cardiac Action Potential

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Cardiac action potentials are essential for proper heart function, enabling the rhythmic contractions needed for adequate blood circulation. Nodal cells and Purkinje fibers, specialized for electrical conduction, generate these action potentials.
The cardiac action potential process involves a series of phases characterized by the movement of ions across the cardiac cell membranes, leading to the depolarization and repolarization of the cardiac myocytes.
Ionic Basis of Cardiac Action Potentials
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Updated: Jun 30, 2025

Single-Cell Optical Action Potential Measurement in Human Induced Pluripotent Stem Cell-Derived Cardiomyocytes
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Single-Cell Optical Action Potential Measurement in Human Induced Pluripotent Stem Cell-Derived Cardiomyocytes

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Single-cell ionic current phenotyping explains stem cell-derived cardiomyocyte action potential morphology.

Alexander P Clark1, Siyu Wei2, Kristin Fullerton3

  • 1Department of Biomedical Engineering, Cornell University, Ithaca, New York, United States.

American Journal of Physiology. Heart and Circulatory Physiology
|March 15, 2024
PubMed
Summary
This summary is machine-generated.

Rapid ionic current phenotyping (RICP) quantifies ionic currents in human induced pluripotent stem cell-derived cardiomyocytes (iPSC-CMs) to understand action potential (AP) variability. This method reveals key ionic determinants of AP heterogeneity, improving iPSC-CMs as an in vitro model.

Keywords:
arrhythmiascomputer simulationiPSC-CMsinduced pluripotent stem cellspatch clamp

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Area of Science:

  • Cardiovascular Physiology
  • Stem Cell Biology
  • Electrophysiology

Background:

  • Human induced pluripotent stem cell-derived cardiomyocytes (iPSC-CMs) are valuable for studying arrhythmia factors.
  • Action potential (AP) variability in iPSC-CMs limits their utility as an in vitro model.
  • Understanding the ionic basis of AP heterogeneity is crucial for improving iPSC-CM applications.

Purpose of the Study:

  • To introduce and validate rapid ionic current phenotyping (RICP) for analyzing ionic currents in iPSC-CMs.
  • To elucidate the ionic mechanisms underlying action potential (AP) heterogeneity in iPSC-CMs.
  • To correlate ionic current properties with AP morphology using computational models.

Main Methods:

  • Utilized brief (10 s) dynamic voltage-clamp (VC) data for rapid ionic current phenotyping (RICP).
  • Correlated RICP-derived ionic current features with AP recordings from the same iPSC-CMs.
  • Employed computational models to interpret cellular heterogeneity and ionic current contributions.

Main Results:

  • Identified L-type calcium and sodium currents as contributors to AP upstroke velocity.
  • Found that rapid delayed rectifier K+ current (IKr) is the primary determinant of maximal diastolic potential.
  • Determined that an outward current near the slow delayed rectifier K+ activation range dictates AP duration, with an additional unidentified outward current at 6 mV also playing a role.

Conclusions:

  • RICP provides mechanistic insights into the ionic currents driving AP heterogeneity in iPSC-CMs.
  • The study identified key ionic determinants of AP morphology, including the unexpected role of IKr in setting the maximal diastolic potential.
  • RICP is recommended for single-cell patch-clamp experiments due to its brief duration and ease of data interpretation, enhancing the utility of iPSC-CMs.