Survival and function of bioengineered cardiac grafts

Area of Science:

• Biomedical Engineering
• Regenerative Medicine
• Cardiovascular Research

Background:

• Congenital heart disease necessitates graft materials for repair.
• Current grafts lack growth potential, contractility, and are thrombogenic.
• A novel bioengineered cardiac graft was developed using fetal rat ventricular cells.

Purpose of the Study:

• To investigate the in vitro and in vivo survival and function of a bioengineered cardiac graft.
• To assess the potential of fetal rat ventricular cells seeded in a biodegradable material for cardiac repair.

Main Methods:

• Fetal rat ventricular muscle cells were seeded into a biodegradable gelatin mesh (Gelfoam).
• In vitro studies evaluated cell growth patterns.
• In vivo studies involved subcutaneous implantation and myocardial scar implantation in rats, followed by histological analysis.

Main Results:

• Cells attached to the mesh and grew in 3 dimensions, forming a beating cardiac graft in vitro.
• Vascularization occurred in both subcutaneous and myocardial scar implant sites.
• The graft exhibited spontaneous and regular contraction after subcutaneous implantation.
• Implanted cells survived and formed junctions with host cells in myocardial scar tissue.

Conclusions:

• Fetal rat ventricular cells can grow in 3D within a gelatin mesh to form cardiac tissue.
• The bioengineered graft demonstrated survival and spontaneous contraction in vitro and after implantation.
• This approach holds promise for future repair of cardiac defects.