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Contractile cardiac grafts using a novel nanofibrous mesh
1Department of Surgery, Massachusetts General Hospital and Harvard Medical School, Wellman 627, 55 Fruit Street, Boston, MA 02114, USA. mshin@partners.org
Biomaterials
|March 17, 2004
Summary
Researchers engineered functional cardiac grafts using nanofibrous meshes and cardiomyocytes. This innovative approach offers a promising method for regenerating heart tissue after infarction, potentially improving cardiac function.
Area of Science:
- Biomaterials Science
- Regenerative Medicine
- Cardiovascular Biology
Background:
- Cardiomyocytes are terminally differentiated and do not regenerate after myocardial infarction.
- Autologous bioengineered cardiac grafts are a potential solution for replacing infarcted myocardium and enhancing cardiac function.
Purpose of the Study:
- To develop an in vitro system for creating engineered myocardium using cardiac nanofibrous meshes (CNMs).
- To assess the feasibility of using electrospun polycaprolactone (PCL) meshes for cardiomyocyte culture and graft development.
Main Methods:
- Neonatal Lewis rat cardiomyocytes were cultured on electrospun nanofibrous polycaprolactone (PCL) meshes with ECM-like topography.
- The meshes were suspended across a wire ring to provide passive load to contracting cardiomyocytes.
- Cardiomyocytes were cultured in vitro for 14 days, and their attachment, beating, and expression of cardiac-specific proteins were evaluated.
Main Results:
- Cardiomyocytes successfully attached to the PCL meshes and began beating within 3 days.
- Expression of cardiac-specific proteins (alpha-myosin heavy chain, connexin43, cardiac troponin I) confirmed cardiomyocyte differentiation and function.
- The study demonstrated the formation of contractile cardiac grafts in vitro.
Conclusions:
- The developed in vitro system enables the formation of contractile cardiac grafts.
- Engineered cardiac grafts can be matured in vitro to achieve sufficient function before implantation.
- Future work may involve stacking CNMs and inducing vascularization for clinically relevant graft dimensions.