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Updated: Jun 19, 2026
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Engineered Vascularized Muscle Flap
Published on: January 11, 2016
Thick soft tissue reconstruction on highly perfusive biodegradable scaffolds
Corrado Mandoli1, Barbara Mecheri, Giancarlo Forte
1NAST Center & Dipartimento di Scienze e Tecnologie Chimiche, University of Rome Tor Vergata, 00133 Roma, Italy.
Macromolecular Bioscience
|November 6, 2009
Summary
Engineered poly(L-lactic acid) scaffolds with vascular-like pores enhance tissue repair. A novel deep-seeding method improves cell infiltration, enabling thick tissue reconstruction for vascular applications.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Regenerative Medicine
Background:
- Three-dimensional (3D) scaffolds are crucial for organ repair, but lack of vascularization limits their use in thick tissue reconstruction.
- Poly(L-lactic acid) (PLLA) scaffolds prepared via thermally induced phase separation (TIPS) offer potential but require optimized pore architecture for perfusion.
- Poor perfusion and absence of vascular networks hinder the clinical application of existing 3D scaffolds for complex tissue regeneration.
Purpose of the Study:
- To develop highly porous PLLA scaffolds with vascular-like microstructures using directional thermally induced phase separation (dTIPS).
- To optimize processing parameters for achieving high porosity and interconnectivity, mimicking vascular patterns.
- To evaluate the in vitro biological response and cell penetration capabilities of the engineered scaffolds for tissue engineering applications.
Main Methods:
- Fabrication of highly-porous PLLA scaffolds using directional thermally induced phase separation (dTIPS) with varying polymer concentrations and temperature gradients.
- Characterization of scaffold porosity, interconnectivity, and pore architecture using microscopy.
- Development and application of a vacuum-based deep-seeding method for uniform cell seeding.
- In vitro culture of mesenchymal stem cells (MSCs) on scaffolds for up to 14 days to assess cell colonization, retention, and differentiation.
Main Results:
- Optimized dTIPS processing yielded PLLA scaffolds with ~93% porosity and 91% interconnectivity.
- Scaffold microstructure featured ordered, dendrite-like cavities resembling vascular networks (20 µm branches, 70 µm backbones).
- The vacuum-based deep-seeding method enabled uniform cell penetration over 1 mm scaffold thickness.
- Significant MSC colonization and retention were observed up to 14 days in vitro, with cells preserving multi-potency.
Conclusions:
- Engineered PLLA scaffolds with vascular-like porosity effectively support cell infiltration and retention.
- The optimized fabrication and deep-seeding method facilitate the reconstruction of thick tissues (up to 1 mm).
- These scaffolds show promise for applications requiring vascular network formation and angiogenesis in regenerative medicine.
