Three-dimensional tissue-engineered skeletal muscle for laryngeal reconstruction

Area of Science:

• Regenerative Medicine
• Tissue Engineering
• Laryngeal Surgery

Background:

• There is a critical need for functional 3D muscle constructs for laryngeal reconstruction.
• Current methods cannot provide autologous, integrated engineered muscle for repairing vocal fold defects or addressing paralysis.

Purpose of the Study:

• To develop and evaluate functional 3D tissue-engineered skeletal muscle constructs for laryngeal applications.
• To assess the integration and functional restoration of engineered muscle in a rat laryngeal defect model.

Main Methods:

• Isolation of primary skeletal muscle progenitor cells (MPCs) from rats.
• Encapsulation of MPCs in a collagen formulation with flow alignment and culture under passive tension to create 3D constructs.
• Implantation of constructs into surgically created laryngeal defects in rats, followed by functional and histological assessment at 1 and 3 months.

Main Results:

• In vitro analysis confirmed well-differentiated, aligned myotubes within the engineered muscle constructs.
• Postoperative assessment showed restoration of laryngeal function, evidenced by safe swallowing and weight gain.
• Ex vivo testing demonstrated functional muscle contraction, and histology confirmed successful integration into host laryngeal tissues.

Conclusions:

• This study demonstrates the successful development of functional 3D tissue-engineered skeletal muscle from primary MPCs and collagen.
• These findings hold significant promise for future clinical applications in autologous laryngeal muscle repair and reconstruction.