Construction of a unidirectionally beating 3-dimensional cardiac muscle construct

Area of Science:

• Biomedical Engineering
• Regenerative Medicine
• Cardiovascular Research

Background:

• Cardiac tissue engineering seeks to replicate native cardiac tissue properties.
• Engineered cardiac tissues (ECTs) can be fabricated using synthetic scaffolds or liquid collagen.
• This study introduces a novel cardiac muscle device for constructing heart tissue.

Purpose of the Study:

• To investigate the impact of cell seeding density and collagen quantity on liquid collagen-based cardiac muscle formation.
• To optimize conditions for creating engineered cardiac tissues (ECTs).

Main Methods:

• Neonatal rat cardiac myocytes were combined with collagen type I and matrix factors.
• Cardiac myocytes and collagen were cast into circular strands using a novel device.
• Histologic analyses, confocal laser scanning microscopy, and transmission electron microscopy evaluated cell morphology, orientation, and ultrastructure.

Main Results:

• Histologic analysis confirmed that cardiac cells formed longitudinally oriented bundles resembling native cardiac tissue.
• Optimized cell density and collagen quantity resulted in ECTs exhibiting features of native differentiated myocardium.
• Microscopic evaluations confirmed the successful formation of organized cardiac muscle structures.

Conclusions:

• Engineered cardiac tissues (ECTs) comparable to native cardiac tissue can be successfully created under optimized conditions.
• This engineered cardiac muscle represents a significant initial step in in vitro cardiac tissue development.
• The developed ECTs hold potential for applications in cardiac development research, drug testing, and tissue replacement therapies.