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Cochlear function after selective inner hair cell degeneration induced by carboplatin
S Takeno1, R V Harrison, D Ibrahim
1Department of Otolaryngology, Hospital for Sick Children, Toronto, Ontario, Canada.
Hearing Research
|May 1, 1994
Summary
Carboplatin chemotherapy damages inner hair cells (IHCs) in the cochlea, unlike other ototoxic drugs that affect outer hair cells (OHCs). This selective IHC damage in chinchillas offers a model to study cochlear function.
Area of Science:
- Ototoxicology
- Neuroscience
- Auditory Science
Background:
- Carboplatin is a widely used chemotherapy agent.
- Ototoxicity is a significant side effect of many cancer therapies.
- The specific mechanism of carboplatin-induced ototoxicity is not fully understood.
Purpose of the Study:
- To investigate the ototoxic effects of carboplatin in a chinchilla model.
- To characterize the hair cell populations affected by carboplatin treatment.
- To evaluate the functional consequences of carboplatin-induced cochlear damage.
Main Methods:
- Chinchillas were administered a clinical therapeutic dose of carboplatin (400 mg/m2).
- Cochlear function was assessed using auditory brainstem response (ABR) and cochlear microphonics (CM) recordings.
- Cochlear lesions were examined using scanning electron microscopy (SEM).
Main Results:
- Carboplatin predominantly damaged inner hair cells (IHCs), sparing outer hair cells (OHCs).
- Auditory brainstem response (ABR) thresholds increased proportionally to IHC damage.
- Cochlear microphonics (CM) remained largely unaffected, indicating OHC preservation.
Conclusions:
- Carboplatin exhibits selective ototoxicity, primarily targeting IHCs.
- This selective damage highlights the independence of IHC and OHC systems in auditory transduction.
- The chinchilla model with selective IHC loss is valuable for studying cochlear function and OHC roles.