Gene therapy in the inner ear using adenovirus vectors

Area of Science:

• Otolaryngology
• Regenerative Medicine
• Molecular Biology

Background:

• Hearing loss significantly impacts quality of life and incurs substantial costs.
• Current therapies focus on protection, but regeneration of auditory hair cells remains a challenge.
• Adenoviral vectors have emerged as a promising tool in otologic research.

Purpose of the Study:

• To explore the potential of adenoviral vectors for protecting and regenerating auditory hair cells.
• To investigate the role of Atoh1 gene delivery in hair cell regeneration.
• To assess functional recovery following therapeutic interventions.

Main Methods:

• Adenoviral vectors were used to deliver neurotrophic and growth factors to protect hair cells and neurons.
• Adenoviral transfection was performed in the scala media via cochleostomy.
• Adenoviral-mediated overexpression of the transcription factor Atoh1 was employed for hair cell regeneration.

Main Results:

• Adenoviral-induced expression of factors protected auditory structures from ototoxic damage.
• Adenoviral delivery to the scala media proved feasible.
• Overexpression of Atoh1 induced transdifferentiation of supporting cells into hair cells, regenerating both auditory and vestibular hair cells.
• Functional recovery in both auditory and vestibular systems was observed.

Conclusions:

• Adenoviral vectors are effective for delivering therapeutic agents to the cochlea.
• Adenoviral-mediated Atoh1 overexpression represents a viable strategy for regenerating damaged hair cells.
• This approach holds significant potential for treating hearing loss caused by hair cell depletion.