In vitro electrophysiological mapping of stem cells

Area of Science:

• Cardiovascular Research
• Regenerative Medicine
• Biomedical Engineering

Background:

• Stem cell-derived cardiomyocytes (SC-CMs) are crucial for cardiac regeneration.
• Effective integration of SC-CMs requires proper electrical coupling with host cardiac tissue.
• Assessing the electrophysiological properties of SC-CMs is vital for their functional application.

Purpose of the Study:

• To present the materials and methods for microelectrode array (MEA) and optical mapping techniques.
• To provide detailed notes on the use, design, and fabrication of these electrophysiological mapping tools.
• To demonstrate the application of these techniques for studying stem cell-derived cardiomyocytes.

Main Methods:

• Microelectrode array (MEA) recordings for extracellular measurements and electrical propagation assessment in cell cultures.
• Optical mapping utilizing fluorescent dyes to monitor electrophysiological changes (transmembrane potential, intracellular calcium).
• Detailed protocols for MEA and optical mapping, including fabrication and usage guidelines.

Main Results:

• Examples of voltage and calcium maps generated using optical mapping techniques are presented.
• The study provides practical insights into the application of MEA and optical mapping for SC-CMs.
• Demonstration of electrophysiological properties of mouse embryonic stem cell-derived cardiomyocytes (mESC-CMs).

Conclusions:

• MEA and optical mapping are essential techniques for evaluating the electrophysiological characteristics of SC-CMs.
• These methods facilitate the assessment of electrical coupling necessary for successful cardiac regeneration.
• The presented methodologies and examples aid researchers in studying and developing stem cell-based cardiac therapies.