Early fiber development in human vocal folds: An in vitro pilot study

Area of Science:

• Biomedical Engineering
• Tissue Engineering
• Cell Biology

Background:

• Human vocal folds possess a layered structure crucial for voice production.
• Understanding the development of vocal fold extracellular matrix is key to regenerative medicine.
• Previous research has focused on static or simpler mechanical stimuli.

Purpose of the Study:

• To investigate the effects of combined mechanical strain and vibration on engineered human vocal fold tissue.
• To determine if specific mechanical conditioning can induce fiber orientation in a vocal ligament construct.
• To explore the potential for creating functional vocal fold tissue in vitro.

Main Methods:

• Seeding a human vocal fold fibroblast cell line onto polyurethane foam scaffolds.
• Culturing the seeded scaffolds in a bioreactor for 3 weeks under various mechanical regimens.
• Applying combinations of static strain and dynamic vibration to mimic in vivo vocal fold forces.
• Qualitatively analyzing collagen type 1 fiber orientation using microscopy.

Main Results:

• Under static conditions, collagen type 1 fibers exhibited random organization.
• The application of both vibration and strain led to the development of some degree of fiber orientation.
• Engineered tissue showed potential for developing structural anisotropy.

Conclusions:

• Combined mechanical stimuli, specifically vibration and strain, are effective in inducing fiber orientation in engineered vocal fold tissue.
• This suggests a pathway for developing functional vocal fold tissue with organized extracellular matrix.
• The findings have implications for vocal fold regeneration and voice disorder research.