Radixin deficiency causes deafness associated with progressive degeneration of cochlear stereocilia.
Radixin deficiency causes deafness associated with progressive degeneration of cochlear stereocilia.
复制标题
根黄素缺乏会导致与耳蜗静纤毛进行性退化相关的耳聋。
DOI:
10.1083/jcb.200402007
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发表时间:
2004-08-16
期刊:
影响因子:
--
通讯作者:
Tsukita S
中科院分区:
文献类型:
--
作者:
Kitajiri S;Fukumoto K;Hata M;Sasaki H;Katsuno T;Nakagawa T;Ito J;Tsukita S;Tsukita S
Ezrin/radixin/moesin (ERM) proteins cross-link actin filaments to plasma membranes to integrate the function of cortical layers, especially microvilli. We found that in cochlear and vestibular sensory hair cells of adult wild-type mice, radixin was specifically enriched in stereocilia, specially developed giant microvilli, and that radixin-deficient (Rdx − / −) adult mice exhibited deafness but no obvious vestibular dysfunction. Before the age of hearing onset (∼2 wk), in the cochlea and vestibule of Rdx − / − mice, stereocilia developed normally in which ezrin was concentrated. As these Rdx − / − mice grew, ezrin-based cochlear stereocilia progressively degenerated, causing deafness, whereas ezrin-based vestibular stereocilia were maintained normally in adult Rdx − / − mice. Thus, we concluded that radixin is indispensable for the hearing ability in mice through the maintenance of cochlear stereocilia, once developed. In Rdx − / − mice, ezrin appeared to compensate for radixin deficiency in terms of the development of cochlear stereocilia and the development/maintenance of vestibular stereocilia. These findings indicated the existence of complicate functional redundancy in situ among ERM proteins.
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