Differential cell adhesion to vocal fold extracellular matrix constituents

Area of Science:

• Biomedical Engineering
• Cell Biology
• Otorhinolaryngology

Background:

• The human vocal folds' unique extracellular matrix (ECM) is crucial for phonation.
• Cellular interactions with the ECM govern vocal fold biomechanics and function.

Purpose of the Study:

• To investigate the adhesion of novel vocal fold stellate cells and fibroblasts to ECM components.
• To elucidate the roles of hyaluronan and Rho-ROCK signaling in cell adhesion.
• To explore the impact of fibronectin-integrin interactions on cell adhesion.

Main Methods:

• Primary cell culture of vocal fold stellate cells and fibroblasts.
• Assessment of cell adhesion to eight ECM components (elastin, decorin, fibronectin, hyaluronic acid, laminin, collagen types I, III, IV).
• Pharmacological inhibition of hyaluronan (hyaluronidase) and Rho-ROCK (Y-27632), and fibronectin integrins (Nimesulide).

Main Results:

• Vocal fold cells and fibroblasts exhibited differential adhesion to ECM substrates over time.
• Inhibition of hyaluronan and Rho-ROCK signaling reduced cell adhesion, particularly for fibroblasts.
• Modulation of fibronectin integrin activity affected cell adhesion.

Conclusions:

• Cellular adhesion to vocal fold ECM is a complex process involving hyaluronan and Rho-ROCK pathways.
• Findings provide insights into vocal fold wound healing, scarring, and disease.
• Results support the development of advanced organotypic models for vocal fold research.