Influence of field potential duration on spontaneous beating rate of human induced pluripotent stem cell-derived...

Area of Science:

• Cardiovascular pharmacology
• Stem cell biology
• Electrophysiology

Background:

• Field potential duration (FPD) in human pluripotent stem cell (hiPSC)-derived cardiomyocytes is crucial for assessing drug-induced delayed repolarization.
• The interdependence between beating rate and FPD in spontaneously beating hiPSC-derived cardiomyocytes complicates data interpretation.
• This relationship necessitates careful analysis and cautious interpretation of drug screening results.

Purpose of the Study:

• To investigate the relationship between spontaneous beating rate and field potential duration in hiPSC-derived cardiomyocytes.
• To develop a novel method for distinguishing primary rate-altering effects from repolarization effects of compounds.
• To provide a more accurate approach for assessing drug-induced repolarization.

Main Methods:

• Analysis of data from various hiPSC-derived cardiomyocyte types and primary embryonic chick cardiomyocytes.
• Utilized reference compounds to study rate-FPD relationships.
• Developed a regression model to analyze drug-induced changes in inter-beat interval versus FPD.

Main Results:

• Demonstrated the application of the developed method using reference and research compounds.
• Observed variations in spontaneous beating responses to compounds across different cell types.
• Highlighted that while FPD adapted to rate changes, the spontaneous rate adaptation to FPD changes varied significantly between cell types.

Conclusions:

• The developed regression-based method is more appropriate than standard in vivo correction algorithms for analyzing drug effects on cardiomyocyte repolarization.
• This approach accounts for the rate-dependence of FPD, which is often overlooked by existing algorithms.
• The findings suggest a more robust assessment of drug-induced repolarization using hiPSC-derived cardiomyocytes.