Frame-Hydrogel Methodology for Engineering Highly Functional Cardiac Tissue Constructs.

Area of Science:

• Biomedical Engineering
• Cardiovascular Research
• Tissue Engineering

Background:

• Engineered cardiac tissues are crucial for drug discovery, disease modeling, and regenerative medicine.
• Achieving mature, functional properties in engineered tissues remains a significant challenge.
• Current methods often require complex stimulation or bioreactors for tissue maturation.

Purpose of the Study:

• To present a versatile "frame-hydrogel" methodology for generating highly mature engineered cardiac tissues.
• To demonstrate the adaptability of this method across various cell types and tissue geometries.
• To achieve rapid functional maturation without exogenous stimulation.

Main Methods:

• Utilized a "frame-hydrogel" system to fabricate engineered cardiac tissues.
• Employed diverse cell sources including neonatal rat ventricular myocytes and pluripotent stem cell-derived cardiomyocytes.
• Generated tissues with various 3D geometries (patch, bundle, network) and anisotropy levels.

Main Results:

• Achieved rapid maturation of engineered cardiac tissues without electrical or mechanical stimulation.
• Tissues demonstrated high functional properties: conduction velocities of 25 cm/s and specific forces of 20 mN/mm².
• Observed forces per input cardiomyocyte up to 12 nN.
• Method proved reproducible and scalable for both small in vitro and large clinical dimensions.

Conclusions:

• The frame-hydrogel methodology offers a versatile and efficient platform for creating mature engineered cardiac tissues.
• This approach simplifies tissue engineering, enabling rapid functional development for various applications.
• The scalability and reproducibility make it suitable for both preclinical testing and potential therapeutic use.