Induced Pluripotent Stem Cell-Derived Cardiomyocytes Provide In Vivo Biological Pacemaker Function

Area of Science:

• Regenerative Medicine
• Cardiovascular Research
• Stem Cell Biology

Background:

• Existing biological pacemaker approaches in animal models have limitations.
• Induced pluripotent stem cell-derived cardiomyocytes (iPSC-CMs) have not been previously explored for biological pacemaker function.
• This study investigates the potential of iPSC-CMs as a biological pacemaker in a canine model.

Purpose of the Study:

• To evaluate the pacemaker function of iPSC-CMs in a canine model.
• To assess the integration and electrophysiological characteristics of iPSC-CMs after implantation.

Main Methods:

• Human keratinocyte-derived embryoid bodies were generated and characterized.
• Atrioventricular blocked dogs received subepicardial injections of iPSC-CMs.
• Implanted cells were monitored using ECG and Holter monitoring, with electrophysiological and histological analysis post-epinephrine infusion.

Main Results:

• iPSC-CMs differentiated, expressed cardiac markers, and exhibited automaticity.
• Implanted iPSC-CMs demonstrated pacemaker activity, with matching beats increasing over time.
• Biological pacemaker rates reached up to 75 bpm, and epinephrine administration increased the heart rate.

Conclusions:

• iPSC-CMs can successfully integrate into host myocardium and establish biological pacemaker function.
• This represents a promising advancement in biological pacing.
• Further optimization of rate and rhythm control for iPSC-CM-based pacemakers is required.