Silk fibroin/gelatin microcarriers as scaffolds for bone tissue engineering

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Regenerative Medicine

Background:

• Microcarrier cell scaffolds are crucial for injectable cell delivery and tissue engineering.
• A 'bottom-up' approach using microparticles enables hierarchical tissue assembly and uniform cell distribution.
• Silk fibroin (SF) and gelatin (G) are biocompatible materials with potential for scaffold development.

Purpose of the Study:

• To develop and characterize silk fibroin/gelatin (SF/G) blend microcarriers for tissue engineering applications.
• To evaluate the cell compatibility, mechanical properties, and osteogenic differentiation potential of SF/G microcarriers.

Main Methods:

• SF and G were blended in various ratios (25:75, 50:50, 75:25).
• Microcarriers were fabricated using an axisymmetric flow focusing device.
• Cell compatibility was assessed in 2D culture, and rat mesenchymal stem cell adhesion and osteogenic differentiation were evaluated under dynamic culture conditions.

Main Results:

• SF/G blends demonstrated cell compatibility comparable to tissue culture plastic.
• Blended materials exhibited enhanced mechanical properties (increased Young's moduli) compared to SF alone.
• SF/G microcarriers efficiently supported rat mesenchymal stem cell adhesion and osteogenic differentiation.

Conclusions:

• SF/G blend microcarriers are reproducible and support cell adhesion and osteogenic differentiation.
• These microcarriers show significant potential as building blocks for osteogenic tissue engineering.
• The developed microcarriers offer a promising platform for regenerative medicine strategies.