Aligned Collagen Sponges with Tunable Pore Size for Skeletal Muscle Tissue Regeneration

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Tissue Engineering

Background:

• Volumetric muscle loss (VML) involves significant skeletal muscle destruction and functional loss.
• Current autologous tissue transfer treatments for VML have high failure rates due to necrosis and infection.
• Existing tissue engineering scaffolds struggle to promote aligned myofiber regeneration, limiting functional recovery.

Purpose of the Study:

• To determine the optimal scaffold pore size for myoblast infiltration and differentiation.
• To develop collagen scaffolds with tunable, longitudinally aligned pores for VML treatment.

Main Methods:

• Collagen scaffolds with varying pore sizes were fabricated by adjusting freezing rates.
• Scaffolds frozen at -20 °C exhibited the largest pore sizes.
• Myoblast infiltration and orientation were assessed on scaffolds with different pore characteristics.

Main Results:

• Scaffolds frozen at -20 °C demonstrated significantly larger pore sizes.
• These larger pores facilitated superior myoblast infiltration into the scaffold.
• The aligned pores provided topographical cues that guided myoblast orientation.

Conclusions:

• Scaffold pore size and alignment are critical factors for successful myoblast infiltration and orientation.
• Optimized collagen scaffolds show promise for regenerating muscle tissue after VML.
• Further research aims to enhance myofiber formation for an off-the-shelf VML therapeutic.