Decellularized Human Skeletal Muscle as Biologic Scaffold for Reconstructive Surgery.

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Regenerative Medicine

Background:

• Engineered skeletal muscle tissues offer solutions for volumetric muscle loss.
• Biologic scaffolds are typically derived from decellularized animal skeletal muscles.

Purpose of the Study:

• To characterize biologic scaffolds from decellularized human skeletal muscle.
• To compare decellularization protocols for human, rat, and rabbit muscle.
• To evaluate the integration of human scaffolds in rabbit abdominal wall defects.

Main Methods:

• Skeletal muscle samples (human, rat, rabbit) were decellularized using two protocols: Protocol 1 (sodium deoxycholate, DNase I) and Protocol 2 (trypsin-EDTA, Triton X-NH4OH).
• Scaffold characteristics were analyzed using transmission and scanning electron microscopy.
• Human scaffolds were implanted into rabbit abdominal wall defects to assess integration.

Main Results:

• Protocol 2 was more effective, removing cellular material while preserving the collagen and elastic fiber network.
• Ultrastructural analysis confirmed the preservation of collagen, elastic fibers, glycosaminoglycans, and proteoglycans.
• Implanted human scaffolds demonstrated good integration in rabbits, but complete muscle cell recolonization was not achieved.

Conclusions:

• Human skeletal muscle can be effectively decellularized to create scaffolds with preserved extracellular matrix architecture and suitable mechanical properties for implantation.
• These scaffolds show promise for integration into tissue defects.
• Further investigation is required to assess the efficacy of in vitro recolonization with autologous cells prior to in vivo application.