动蛋白结合蛋白TRIOBP形成了头发细胞立体细胞的弹性根子,这对于听力至关重要
Shin-ichiro Kitajiri1, Takeshi Sakamoto, Inna A Belyantseva
1Laboratory of Molecular Genetics, National Institute on Deafness and Other Communication Disorders, National Institutes of Health, Rockville, MD 20850, USA.
Cell
|June 1, 2010
概括
缺少TRIOBP蛋白质会导致严重的耳聋,因为它会阻止内耳中基本的立体耳根的形成. 这种actin捆绑蛋白对于毛细胞机械敏感性和结构完整性至关重要.
科学领域:
- 细胞生物学 细胞生物学
- 听觉神经科学 听觉神经科学
- 分子生物学分子生物学
背景情况:
- 内耳毛细胞使用立体来检测声音.
- 立体含有形成密集根子的活性丝,但它们的功能和分子基础是未知的.
- 在TRIOBP的突变导致遗传性聋 (DFNB28).
研究的目的:
- 为了研究立体根的功能.
- 确定TRIOBP在根子形成和听觉功能中的作用.
主要方法:
- 在立体细胞中对TRIOBP的免疫定位.
- 在试验室中使用纯化的TRIOBP进行actin捆绑测试.
- 产生和分析一个TRIOBP缺乏的小鼠模型 (Triobp(Deltaex8/Deltaex8).
主要成果:
- TRIOBP局部化到立体根.
- 在试验室中,TRIOBP异型4形成了密集的乙捆.
- 三鼠 (Deltaex8/Deltaex8) 的老鼠是非常聋的.
- 突变小鼠没有根子,表现出更容易折射和容易损坏的立体.
结论:
- TRIOBP对于形成立体根的基础是必不可少的.
- 以TRIOBP为媒介的动因捆绑为立体提供了结构耐用性和刚性.
- TRIOBP对于正常的听觉机械敏感性至关重要,并可能支持其他弹性细胞骨架结构.
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