Sustained releasing sponge-like 3D scaffolds for bone tissue engineering applications

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Tissue Engineering

Background:

• Traditional 2D scaffolds have limitations in mimicking native tissue structures and can cause pore blockage.
• Three-dimensional (3D) scaffolds are crucial for effective tissue engineering, with electrospinning being a key fabrication technique.

Purpose of the Study:

• To develop a modified one-step electrospinning process for fabricating a 3D scaffold with interconnected pores.
• To evaluate the potential of a dexamethasone (Dex)-loaded 3D scaffold for bone tissue engineering applications.

Main Methods:

• A blend of poly (L-lactide)/polycaprolactone/poly (ethylene oxide) was used in a modified one-step electrospinning process.
• The resulting 3D scaffold's pore structure, mechanical viability, and cell penetration depth were assessed.
• Dexamethasone (Dex) was incorporated for sustained drug release studies.
• Mesenchymal stem cells were used to evaluate the scaffold's potential for upregulating osteogenic genes.

Main Results:

• A mechanically viable, sponge-like 3D scaffold with highly interconnected pores was successfully fabricated.
• The scaffold exhibited large pores and enabled cell penetration exceeding 500 μm.
• Sustained release of loaded dexamethasone (Dex) was achieved.
• The Dex-loaded 3D scaffold demonstrated potential for upregulating osteogenic genes in mesenchymal stem cells.

Conclusions:

• The developed 3D electrospun scaffold offers a promising platform for bone tissue engineering due to its unique morphology and controlled drug release.
• The scaffold's interconnected porous structure and ability to support cell infiltration make it suitable for regenerative medicine applications.
• Further tailoring of this scaffold could extend its utility to other tissue engineering fields beyond bone regeneration.