Biomimetic dual-oriented/bilayered electrospun scaffold for vascular tissue engineering.

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Regenerative Medicine

Background:

• Natural blood vessels possess a complex, multi-layered structure crucial for their function.
• Mimicking this native architecture is a key strategy for developing effective blood vessel regeneration therapies.
• Existing synthetic scaffolds often fail to replicate the intricate cellular organization of native vessels.

Purpose of the Study:

• To engineer a novel dual-oriented, bilayered tubular scaffold for small-diameter vascular tissue engineering.
• To evaluate the scaffold's ability to guide the orientation of smooth muscle cells (SMCs) and endothelial cells (ECs) in vitro.
• To assess the scaffold's material properties, degradation profile, and cellular compatibility.

Main Methods:

• Electrospinning a composite of poly(ε-caprolactone) (PCL), poly(D, L-lactide-co-glycolide) (PLGA), and gelatin to create a bilayered scaffold.
• Achieving perpendicular nanofiber orientations in each layer to mimic native vessel structure.
• Seeding SMCs and ECs onto the scaffold to assess cell adhesion, proliferation, morphology, and cytoskeletal organization in vitro.

Main Results:

• The composite scaffold exhibited enhanced hydrophilicity due to gelatin and superior mechanical properties compared to controls.
• The scaffold demonstrated a relatively fast degradation rate, suitable for tissue regeneration.
• In vitro studies confirmed excellent cell viability, proliferation, and guided orientation of both SMCs and ECs by the scaffold's topography.

Conclusions:

• The dual-oriented, bilayered electrospun scaffold serves as a promising structural and functional analog to natural blood vessels.
• This scaffold demonstrates significant potential as a candidate material for vascular tissue engineering applications.
• The scaffold's ability to guide specific cell orientations is critical for successful blood vessel regeneration.