Excitation propagation in three-dimensional engineered hearts using decellularized extracellular matrix.

Area of Science:

• Biomedical Engineering
• Cardiovascular Research
• Tissue Engineering

Background:

• Decellularized extracellular matrix (ECM) offers a scaffold for engineering 3D cardiac tissues.
• Creating functional artificial hearts comparable to native organs requires overcoming challenges like stable excitation-propagation.

Purpose of the Study:

• To investigate the conduction properties and excitation-propagation in engineered cardiac tissues.
• To assess the potential of decellularized ECM for building functional, organ-like cardiac structures.

Main Methods:

• Repopulating decellularized rat hearts with neonatal cardiac cells.
• Observing excitation-propagation using high-resolution live tissue imaging (GFP and GCaMP2).
• Conducting immunofluorescence staining to analyze cellular morphology and connexin43 expression.

Main Results:

• Engineered hearts demonstrated dynamic, generally organized excitation-propagation.
• Observed arrhythmogenic propensity, including disorganized propagation.
• Immunofluorescence revealed random cell alignment, cardiomyocyte disarray, and decreased connexin43 expression.

Conclusions:

• Successfully demonstrated dynamic excitation-propagation in recellularized whole-organ engineered hearts.
• The strategy provides foundational insights for constructing functional 3D-engineered hearts.
• Addressing cellular organization and gap junction expression is crucial for future development.