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- W2012858508 abstract "OBJECTIVE: In chinchillas, moderate doses of carboplatin administered systemically selectively destroy inner hair cells and type I vestibular hair cells; however, it is unclear whether this unique damage pattern persists if carboplatin is applied directly to the cochlea, how quickly the damage develops and what cell death pathways are involved. STUDY DESIGN: To address these questions, carboplatin (5 mg/ml, 50 µl) was applied to the round window. RESULTS: Carboplatin caused a rapid decline in distortion product otoacoustic emissions, significantly increased compound action potential thresholds and caused massive inner hair cell loss and less severe outer hair cell loss. Hair cell loss was initially more severe in the base than the apex of the cochlea, but by 28 days post-treatment most cochlear hair cells were missing and hair cell density in the utricle, saccule and lateral crista was greatly reduced. At one day post-treatment, many hair cell nuclei were condensed or fragmented indicative of apoptosis, and expressed initiator caspase-8 and executioner caspase-3, but not initiator caspase-9. Carboplatin-treated animals circled towards the treated ear and during the swim test rolled towards the treated ear. CONCLUSION: These results indicate that local application of carboplatin causes loss of hair cells that begins near the base of the cochlea and spreads towards the apex with increasing survival time. Hair cell loss is initiated by caspase-8 followed by executioner caspase-3." @default.
- W2012858508 created "2016-06-24" @default.
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- W2012858508 date "2009-01-01" @default.
- W2012858508 modified "2023-09-28" @default.
- W2012858508 title "Functional and structural changes in the chinchilla cochlea and vestibular system following round window application of carboplatin" @default.
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- W2012858508 doi "https://doi.org/10.3109/16513860903335795" @default.
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