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Updated: Apr 21, 2026
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Morphological and Functional Evaluation of Ribbon Synapses at Specific Frequency Regions of the Mouse Cochlea
Published on: May 10, 2019
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Spontaneous and Partial Repair of Ribbon Synapse in Cochlear Inner Hair Cells After Ototoxic Withdrawal
Ke Liu1, DaiShi Chen1, WeiWei Guo1
1Department of Otolaryngology-Head and Neck Surgery, the Institute of Otolaryngology, Chinese PLA General Hospital, 28 Fuxing Road, 100853, Beijing, China.
Molecular Neurobiology
|November 8, 2014
Summary
Sensorineural hearing loss from ototoxicity may be reversible. This study shows that cochlear ribbon synapses can repair themselves after drug withdrawal, leading to partial hearing recovery in mice.
Area of Science:
- Ototoxicity and Auditory Neuroscience
- Cellular Biology of Hearing
Background:
- Ototoxicity, often caused by medications, is a significant factor contributing to sensorineural hearing loss.
- The reversibility of ototoxicity-induced sensorineural hearing impairment remains largely undetermined.
- Understanding the cellular mechanisms underlying hearing recovery is crucial for developing therapeutic strategies.
Purpose of the Study:
- To investigate the potential for hearing restoration after ototoxic drug withdrawal.
- To examine the structural and functional recovery of ribbon synapses between inner hair cells (IHCs) and spiral ganglion nerve (SGN) fibers following ototoxic exposure.
- To determine if cochlear repair mechanisms contribute to hearing recovery.
Main Methods:
- Adult mice were administered a low dose of gentamicin daily for 14 days to induce ototoxicity.
- Synaptic ribbon structures in the cochlea were quantified using immunostaining for RIBEYE/CtBP2.
- Hearing function was assessed via auditory brainstem responses (ABRs).
- Auditory temporal processing was evaluated by measuring compound action potentials (CAPs).
Main Results:
- Significant hearing restoration was observed after the cessation of gentamicin treatment.
- Recovery of hearing thresholds correlated with the restoration of synaptic ribbon number and size.
- While hearing and synaptic recovery were evident, they were not complete, indicating residual damage.
- The findings suggest an intrinsic repair capacity within the cochlea.
Conclusions:
- Sensorineural deafness induced by ototoxicity in mice demonstrates a degree of reversibility.
- The repair of ribbon synapses in the cochlea is a key factor in this hearing restoration.
- This study highlights the potential for intrinsic cochlear repair mechanisms to mitigate ototoxicity-induced hearing loss.
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