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Cochlear function after selective spiral ganglion cells degeneration induced by ouabain

摘要:

Background Ouabain, a cardiac glycoside that specifically binds to Na/K-ATPase and inhibits its activity, was applied to gerbils to develop a method for studying auditory neuropathy.Methods Ouabain was applied to the round window of the cochlea in each gerbil by using a piece of gelfoam with 3 μl or 24 μl (1 mmol/L) ouabain solution. The changes of the threshold of auditory brainstem response,cochlear function round window electrocochleography, as well as the morphological changes of the spiral ganglion cells of the cochlea were observed after application of ouabain for 24 hours or 96 hours.Results:In ouabain treated gerbils, auditory brainstem response and compound action potential thresholds showed either elevation or no response at all. However, the thresholds of cochlear microphonic and distortion product otoacoustic emissions were not affected. Degeneration and necrosis of some spiral ganglion cells in ears with applications of ouabain (24 hours, 3 μl, 1 mmol/L; 96 hours, 24 μl, 1 mmol/L ouabain). The number of spiral ganglion cells was decreased (24 hours, 3 μl, 1 mmol/L ouabain) or near to a total loss (96 hours, 24 μl, 1 mmol/L ouabain).Conclusions:These results indicate a high degree of independence between the spiral ganglion cells and the outer hair cell systems in the cochlear transduction mechanism. The method used in this study would provide a valuable tool for studying auditory neuropathy.

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作者单位: Department of Otolaryngology,Shanghai Sixth People's Hospital of Shanghai Jiao Tong University,Shanghai 200233,China [1] Department of Otolaryngology,Peking Union Medical College Hospital,Chinese Academy of Medical Sciences & Peking Union Medical College,Beijing 100730,China [2]
期刊: 《中华医学杂志(英文版)》2006年119卷12期 974-979页 SCIMEDLINEISTICCSCDBP
分类号: R76
栏目名称: ORIGINAL ARTICLES
发布时间: 2006-08-11
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