Development and characterization of an acellular human pericardial matrix for tissue engineering

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Cardiovascular Surgery

Background:

• The development of effective tissue-engineered grafts is crucial for cardiovascular repair.
• Native pericardium possesses ideal structural properties but faces challenges in transplantation due to immunogenicity.
• Acellular scaffolds offer a promising alternative, minimizing immune response while preserving native tissue architecture.

Purpose of the Study:

• To produce an acellular human pericardium scaffold suitable for recellularization with autologous cells.
• To evaluate the structural integrity, biochemical composition, and mechanical properties of the decellularized matrix.
• To assess the biocompatibility and cytotoxicity of the scaffold for potential use in cardiovascular repair.

Main Methods:

• Human pericardial tissues were decellularized using a sequential treatment of hypotonic buffer, SDS, and nuclease solution.
• Histological analysis, hydroxyproline and glycosaminoglycan content quantification, and ultimate tensile strength testing were performed.
• Cytotoxicity was assessed using human dermal fibroblasts and A549 cells.

Main Results:

• Decellularization successfully removed all cellular components while preserving the pericardial tissue's histioarchitecture and major structural proteins.
• Biochemical analysis showed no significant changes in collagen or glycosaminoglycan content post-decellularization.
• Mechanical testing revealed retained ultimate tensile strength and increased extensibility in specific orientations, with no observed cytotoxicity.

Conclusions:

• Successful decellularization of human pericardium yields a biocompatible scaffold.
• The acellular matrix retains key structural and mechanical properties of native tissue.
• This scaffold is a viable candidate for developing tissue-engineered pericardium for cardiovascular applications.