Hyperosmotic Sisomicin Infusion: A Mouse Model for Hearing Loss

Area of Science:

• Ototolaryngology
• Neuroscience
• Cell Biology

Background:

• Hearing loss stems from cochlear sensory hair cell damage.
• Existing models for inducing hair cell death in mice are inconsistent.
• A reliable method is needed to study hearing impairment and regeneration.

Approach:

• Developed a surgical technique for targeted delivery of a hyperosmotic sisomicin solution into the mouse posterior semicircular canal.
• Induced rapid, synchronous apoptotic death of outer hair cells within 14 hours.
• Observed inner hair cell deterioration and loss by day seven post-treatment.

Key Points:

• The novel approach consistently causes outer hair cell loss and irreversible hearing impairment.
• Synergistic ototoxic damage resulted from combining sisomicin with hyperosmotic stress.
• Inner hair cells showed delayed deterioration, allowing for focused study of outer hair cell effects.

Conclusions:

• This robust animal model offers a valuable tool for otoregenerative research.
• Facilitates preclinical studies, including single-cell and omics-based investigations.
• Aids in exploring therapeutic strategies for hearing loss.