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Mechanical characterization of a customized decellularized scaffold for vascular tissue engineering
W S Sheridan1, G P Duffy, B P Murphy
1Trinity Centre for Bioengineering, School of Engineering, Trinity College Dublin, Dublin 2, Ireland.
Journal of the Mechanical Behavior of Biomedical Materials
|March 10, 2012
Summary
This study engineered decellularized vascular scaffolds with enhanced porosity and internal cavities for improved cell seeding. Customized scaffolds mimic native tissue mechanics, overcoming key challenges in vascular tissue engineering.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Vascular Biology
Background:
- Decellularized tissues face challenges in vascular tissue engineering, including poor cell infiltration, long culture times, and achieving a quiescent medial layer.
- Existing decellularized scaffolds often exhibit compromised mechanical properties and limited cell integration capabilities.
Purpose of the Study:
- To develop a customized decellularized vascular scaffold with enhanced cell infiltration and mechanical integrity for improved vascular tissue engineering.
- To address limitations of current scaffolds by increasing porosity and enabling bulk cell seeding.
Main Methods:
- Decellularized porcine carotid arteries were customized by creating medial cavities for direct cell injection and controlled collagen digestion to increase porosity.
- Histological analysis, mechanical testing (tensile response), and bulk cell seeding with human smooth muscle cells were performed.
Main Results:
- Customized scaffolds exhibited a highly porous structure with longitudinal medial cavities, demonstrating increased porosity without compromising mechanical integrity.
- Scaffold customization successfully reverted tensile properties, particularly in the elastin-dominant phase, to match native tissue, indicating preservation of the elastin network.
- Optimal cell dispersion and retention were achieved in higher porosity scaffolds, with significant smooth muscle cell numbers within the medial layer after 24 hours.
Conclusions:
- The novel customized decellularized vascular scaffold facilitates bulk seeding of the medial layer through integrated cavities.
- Increased scaffold porosity, achieved through controlled decellularization and customization, enhances cell retention without compromising mechanical integrity.
- This approach offers a promising solution for overcoming critical hurdles in vascular tissue engineering, promoting efficient cell integration and scaffold functionality.
