Development and Characterization of a Porcine Mitral Valve Scaffold for Tissue Engineering

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Cardiovascular Research

Background:

• Mitral valve (MV) replacement is crucial for treating valvular heart disease.
• Decellularized scaffolds offer a promising alternative to traditional valve replacements.
• Developing effective decellularization protocols is key for scaffold viability.

Purpose of the Study:

• To develop and characterize a decellularization protocol for whole porcine mitral valves.
• To assess the preservation of scaffold histoarchitecture, biochemistry, and biomechanics.
• To evaluate the biocompatibility and cellular infiltration of the decellularized scaffolds.

Main Methods:

• Porcine MVs were decellularized using SDS and SD, followed by PAA sterilization.
• Scaffolds were analyzed using histology, SEM/TEM, and biochemical assays (hydroxyproline, glycosaminoglycan).
• Cell seeding with human fibroblasts, stem cells, and endothelial cells assessed repopulation and collagen IV production.

Main Results:

• Decellularization yielded acellular scaffolds with conserved histoarchitecture but some collagen IV loss.
• Hydroxyproline content remained stable, while glycosaminoglycan content significantly decreased.
• SEM/TEM confirmed cell removal and partial ECM loss, with preserved collagen and elastin.
• Endothelial cells successfully produced new collagen IV on the non-cytotoxic scaffold.

Conclusions:

• The developed protocol effectively produces acellular mitral valve scaffolds.
• Scaffolds exhibit generally preserved histoarchitecture, biochemistry, and biomechanics.
• The non-cytotoxic scaffold supports endothelial cell function and new matrix formation, indicating potential for MV repair.