Overview

This article presents a method for optically imaging action potentials in ventricular-like induced pluripotent stem cell-derived cardiomyocytes. The technique utilizes a voltage-sensitive fluorescent protein expressed through a promoter-driven approach.

Key Study Components

Area of Science

Cardiac Electrophysiology
Stem Cell Biology
Optical Imaging Techniques

Background

Induced Pluripotent Stem (IPS) cells are used to generate cardiomyocytes.
This technology enhances throughput for action potential recordings.
Ventricular-specific promoter elements enable subtype-specific studies.
Genetically encoded voltage sensors facilitate optical imaging of action potentials.

Purpose of Study

To develop a method for imaging action potentials in cardiomyocytes.
To improve the understanding of cardiac electrophysiology.
To utilize IPS-derived cardiomyocytes for research applications.

Methods Used

Lentiviral transduction to introduce genetically encoded voltage sensors.
Mixing lentivirus with cardiomyocyte maintenance medium.
Using hexadimetherine bromide to enhance infection efficiency.
Replacing culture medium with infection medium for IPS-derived cardiomyocytes.

Main Results

Successful optical imaging of action potentials in cardiomyocytes.
Demonstrated increased throughput for electrophysiological studies.
Enabled subtype-specific recordings using promoter-driven expression.
Validated the use of genetically encoded sensors in live cell imaging.

Conclusions

The method provides a powerful tool for studying cardiac electrophysiology.
It enhances the understanding of action potentials in human cardiomyocytes.
This approach can be applied to various biological questions in cardiac research.

Frequently Asked Questions

What are induced pluripotent stem cells?

Induced pluripotent stem cells are reprogrammed somatic cells that can differentiate into various cell types, including cardiomyocytes.

How does the optical imaging method work?

The method uses voltage-sensitive fluorescent proteins to visualize action potentials in cardiomyocytes.

What is the significance of using a ventricular-specific promoter?

It allows for subtype-specific action potential recordings, enhancing the relevance of the findings to human cardiac physiology.

What role does lentiviral transduction play in this study?

Lentiviral transduction introduces genetically encoded voltage sensors into the cardiomyocytes for imaging.

Why is hexadimetherine bromide used?

Hexadimetherine bromide enhances the efficiency of the lentiviral infection process.

What are the potential applications of this imaging method?

This method can be used to study various aspects of cardiac electrophysiology and drug responses in cardiomyocytes.

Institution - German Centre for Cardiovascular Research (DZHK), Munich Heart Alliance

Articles Published in JoVE