外毛细胞基底侧膜动力蛋白分布均一性的研究

The Distribution of Prestin on the Whole Basolateral Surface of Outer Hair Cells

于宁;翟所强;赵红波;

1:解放军总医院耳鼻咽喉-头颈外科解放军耳鼻咽喉科研究所

2:美国肯塔基州立大学医学中心耳鼻咽喉科

摘要
目的探讨OHC基底部是否存在动力蛋白(Prestin)的表达及其在侧膜三层结构中的定位。方法分别取正常C57小鼠、Wistar大鼠及豚鼠耳蜗的单离外毛细胞,在激光共聚焦显微镜下,利用Prestin特异性抗体与细胞膜标记di-8-ANEPPS双染,对Prestin在单离OHC上的表达与分布情况进行观察。结果OHC基底侧膜存在Prestin抗体的阳性染色,OHC底端亦见阳性染色;②与细胞膜标记di-8-ANEPPS染色相比,Prestin抗体的阳性染色位于细胞膜的外侧;③经低渗细胞外液处理后,OHC侧膜中的质膜层可与内层表皮下池(subsur-fac cisternae,SSC)和中层质膜下小梁(cortical lattice,CL)分离,在激光共聚焦显微镜下,外毛细胞膜最外层的质膜层上可见明显的Prestin抗体阳性染色。结论动力蛋白(Prestin)分布于外毛细胞膜中最外层的质膜层上,在细胞基底部细胞膜上亦有表达。
关键词
耳蜗;主动放大机制;外毛细胞电运动;质膜;动力蛋白
基金项目(Foundation):
国家自然科学基金(30600700,30772413);; 美国NIH项目NIDCD DC(05989)资助
作者
于宁;翟所强;赵红波;
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