Skeletal myogenesis on highly orientated microfibrous polyesterurethane scaffolds.

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Cell Biology

Background:

• Skeletal myogenesis requires optimal substrate-cell signaling for effective tissue development.
• Current in vitro muscle tissue models using scaffolds exhibit poor myofiber directionality, limiting power generation.
• Biodegradable polyesterurethanes show promise for skeletal muscle tissue engineering applications.

Purpose of the Study:

• To investigate skeletal myogenesis on novel biodegradable microfibrous scaffolds made of DegraPol.
• To evaluate the effect of scaffold architecture, specifically fiber orientation, on myoblast behavior.
• To determine if oriented scaffolds can improve in vitro skeletal muscle development.

Main Methods:

• DegraPol was fabricated into highly oriented (O) and non-oriented (N/O) microfibrous meshes via electrospinning, and nonporous films (F) via solvent-casting.
• C2C12 and L6 myoblasts were cultured on these scaffolds.
• Cell proliferation was assessed using SEM analysis and the alamarBlue assay.
• Cell differentiation was evaluated through RT-PCR analysis and MHC immunostaining.

Main Results:

• Highly oriented elastomeric microfibrous DegraPol scaffolds significantly enhanced skeletal myogenesis in vitro.
• Scaffold orientation positively influenced myoblast adhesion and promoted myotube alignment.
• The oriented scaffolds facilitated a noncoplanar arrangement of cells, crucial for functional muscle tissue.
• Directional cues, architectural support, and mechanical properties of the oriented scaffolds were key factors.

Conclusions:

• Highly oriented DegraPol microfibrous scaffolds are effective for promoting skeletal myogenesis in vitro.
• Scaffold design, particularly fiber alignment, plays a critical role in guiding cell behavior for muscle tissue engineering.
• These findings offer a promising approach for developing functional skeletal muscle constructs for regenerative medicine.