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Related Experiment Video

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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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EAD and DAD mechanisms analyzed by developing a new human ventricular cell model.

K Asakura¹, C Y Cha², H Yamaoka²

¹Nippon Shinyaku, Co., Ltd., Kyoto, Japan.

Progress in Biophysics and Molecular Biology

|September 7, 2014

Summary

This study quantifies the role of calcium (Ca2+) mechanisms in cardiac afterdepolarizations. Findings reveal specific ion channel contributions to early (EAD) and delayed (DAD) afterdepolarizations in human ventricular cells.

Keywords:

Delayed afterdepolarization Early afterdepolarization Human ventricular myocyte Late Na(+) current Lead potential analysis Mathematical model

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Area of Science:

Cardiac Electrophysiology
Computational Biology
Cardiovascular Research

Background:

Early afterdepolarizations (EADs) and delayed afterdepolarizations (DADs) are implicated in cardiac arrhythmias.
Calcium (Ca2+) handling and ion channel function are critical determinants of cardiac action potential (AP) dynamics.
Quantitative models are needed to dissect the complex interplay of ionic currents in generating afterdepolarizations.

Purpose of the Study:

To quantitatively investigate the contribution of Ca2+ mechanisms to EAD and DAD generation in a human ventricular cell model.
To analyze the roles of specific ion channels (IK1, INCX, INaL, INaT, ICaL, IKr) in AP repolarization and afterdepolarization dynamics.

Main Methods:

Development of a novel human ventricular cell model incorporating a coupled LCC-RyR model (CaRU) for realistic Ca2+ handling.
Inclusion of human electrophysiological data for ion channel models and simulation of Ca2+ accumulation.
Application of lead potential (VL) analysis to determine the contribution of individual ionic currents to AP repolarization and afterdepolarizations.

Main Results:

The model successfully reproduced Ca2+ dynamics and membrane excitation, enabling the simulation of EADs and DADs under specific conditions (high-frequency stimulation, Na+/K+ pump inhibition, Ca2+ microinjection, or delayed INaL inactivation).
Lead potential analysis identified IK1 and IKr as primary drivers of AP repolarization reversal during EADs.
ICaL and INCX were found to amplify EADs, with their rapid activation accounting for the maximum rate of EAD rise (ICaL: 45.5%, INCX: 54.5%).

Conclusions:

The study provides a quantitative framework for understanding the ionic basis of EADs and DADs in human ventricular cells.
Calcium handling mechanisms, particularly ICaL and INCX, play a significant role in amplifying EADs.
The findings highlight the importance of detailed cellular models for elucidating the mechanisms underlying cardiac arrhythmias.