An in vitro model system to study gene therapy in the human inner ear

Area of Science:

• Otorhinolaryngology
• Regenerative Medicine
• Molecular Biology

Background:

• The human inner ear's complex structure poses challenges for treating hearing and balance disorders.
• Gene therapy offers a potential strategy for restoring cellular function in inner ear pathologies.

Purpose of the Study:

• To establish and validate a novel in vitro organotypic culture model using human vestibular sensory epithelia.
• To assess the feasibility of using adenoviral vectors for gene delivery to inner ear cells.
• To evaluate the model's utility for testing gene therapy reagents targeting inner ear dysfunction.

Main Methods:

• Organotypic cultures were generated from 26 human vestibular sensory epithelia obtained during surgery.
• Multiply deleted adenoviral vectors carrying Green Fluorescent Protein (GFP) and KCNQ4 genes were applied to cultures.
• Transgene expression and protein localization were analyzed 12-96 hours post-transfection.

Main Results:

• The human vestibular organ cultures survived in vitro for up to 5 days.
• Robust expression of GFP was observed in both hair cells and supporting cells.
• Successful transfection with a KCNQ4-carrying vector demonstrated correlation between GFP and KCNQ4 expression.

Conclusions:

• The developed in vitro model system is a viable platform for evaluating gene therapy reagents for inner ear disorders.
• This model allows for the assessment of gene delivery efficiency and functional restoration in human inner ear cells.
• The findings support the potential of gene therapy for treating conditions like Meniere's disease and hearing loss.