Heart rhythm in vitro: measuring stem cell-derived pacemaker cells on microelectrode arrays

Area of Science:

• Cardiology
• Stem Cell Biology
• Drug Discovery

Background:

• Increasing incidence of cardiac arrhythmias necessitates advanced drug efficacy and safety testing systems.
• Current limitations exist in evaluating cardiac conduction system (CCS) drugs using existing cell models.
• Microelectrode Array (MEA) systems offer real-time, non-invasive monitoring of cellular networks.

Purpose of the Study:

• To develop a scalable method for generating pure cardiac pacemaker cells for MEA-based drug screening.
• To optimize the application of these cells on the MEA platform for reliable cardiac function assessment.
• To establish a cellular model for studying cardiac rhythm diseases and drug effects.

Main Methods:

• Generation of pure functional cardiac pacemaker cells from mouse embryonic stem cells (ESCs).
• Comparison of different embryoid body formation methods (hanging drop vs. spherical plates).
• Optimization of cell culture conditions (coating, dissociation, density) for MEA application.

Main Results:

• Successful differentiation of pure, functional cardiac pacemaker cells from ESCs.
• Development of a robust protocol for seeding pacemaker cells onto MEA for long-term culture (weeks).
• Demonstration of electromechanical activity and viability of pacemaker cells on the MEA platform.
• Introduction of spherical plates as a scalable method for generating sinoatrial bodies.

Conclusions:

• A novel, reliable, and affordable cell-based system for cardiac rhythm disease modeling and drug testing has been established.
• The developed pacemaker cell-MEA platform facilitates the assessment of drug efficacy and potential side effects on cardiac function.
• This approach provides a valuable tool for both pacemaker cell research and the development of MEA platforms for other sensitive cell types.