Structural and functional vocal fold epithelial integrity following injury

Area of Science:

• Vocal fold physiology
• Epithelial biology
• Wound healing research

Background:

• An intact vocal fold epithelium is crucial for defense against pathogens.
• Epithelial damage compromises vocal fold homeostasis and host protection.
• Understanding epithelial repair is key to vocal fold protection.

Purpose of the Study:

• To evaluate the time course of structural and functional epithelial restoration after injury in an animal model.
• To elucidate the effects of damage on epithelial architectural and barrier integrity.

Main Methods:

• Prospective, controlled animal study involving 40 rats.
• Unilateral vocal fold mucosa removal surgery.
• Histological and permeability analyses at 3, 7, 14, 30, and 90 days postinjury.

Main Results:

• Rapid structural restoration of a multilayered epithelium, intercellular junctions, and basement membrane by 5 days postinjury.
• Persistent atypical epithelial permeability observed up to 5 weeks postinjury.

Conclusions:

• Epithelial barrier function restoration lags behind structural repair.
• Epithelial regeneration does not equate to full functional barrier integrity.
• Ongoing epithelial leakiness indicates sustained risk for vocal fold damage and pathogen invasion postinjury.