Middle ear mucosal regeneration by tissue-engineered cell sheet transplantation

Area of Science:

• Otolaryngology
• Regenerative Medicine
• Tissue Engineering

Background:

• Cholesteatoma recurrence is linked to poor middle ear mucosal regeneration and impaired gas exchange.
• Conventional tympanoplasty often fails to restore adequate mucosal lining, especially in poorly pneumatized mastoid cavities.
• Improved mucosal regeneration could enhance surgical outcomes for otitis media and cholesteatoma.

Purpose of the Study:

• To develop and evaluate a novel treatment combining tympanoplasty with autologous nasal mucosal epithelial cell sheet transplantation.
• To promote postoperative regeneration of the middle ear mucosa in patients undergoing surgery for middle ear pathologies.

Main Methods:

• Harvested autologous nasal mucosal tissue (approx. 10x10mm²) endoscopically.
• Fabricated tissue-engineered nasal mucosal epithelial cell sheets under Good Manufacturing Practice (GMP) conditions.
• Transplanted cell sheets onto exposed bony surfaces in the tympanic and mastoid cavities during tympanoplasty.

Main Results:

• The procedure was performed on five patients (four with cholesteatoma, one with adhesive otitis media).
• All patients experienced a favorable postoperative course without adverse events or complications.
• Hearing ability was maintained post-transplantation in all treated patients.

Conclusions:

• Autologous nasal mucosal epithelial cell sheet transplantation is a viable and safe method to promote middle ear mucosal regeneration.
• This technique shows promise for improving surgical outcomes and restoring physiological function after middle ear surgery.
• Further research can explore broader applications in otological surgeries requiring mucosal reconstruction.