Myosin light-chain kinase is necessary for membrane homeostasis in cochlear inner hair cells.

Myosin light-chain kinase is necessary for membrane homeostasis in cochlear inner hair cells.
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肌球蛋白轻链激酶对于耳蜗内毛细胞膜稳态是必需的

DOI:
10.1371/journal.pone.0034894
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Zhu MS
Zhu MS
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Zhu GJ;Wang F;Chen C;Xu L;Zhang WC;Fan C;Peng YJ;Chen J;He WQ;Guo SY;Zuo J;Gao X;Zhu MS

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耳蜗毛细胞膜的结构稳态对于感觉传导的各个方面都是至关重要的,但是其维持的调节还没有很好地理解。在这份报告中,我们分析了内毛细胞肌球蛋白轻链激酶(MLCK)特异性缺失的小鼠耳蜗毛细胞。MLCK缺陷小鼠表现出听力受损,对不同频率的点击和音调的听觉脑干反应(ABR)阈值升高5至14 dB,ABR波的振幅显著降低。突变的内毛细胞在体内的毛束周围产生了几个球状结构,表明受损的膜稳定性。从敲除小鼠中分离的内毛细胞始终显示出对低渗溶液的抵抗力较低,膜F-肌动蛋白较少。肌球蛋白轻链磷酸化也减少了突变的内毛细胞。我们的研究结果表明,MLCK是必要的,以维持内毛细胞膜的稳定性。
The structural homeostasis of the cochlear hair cell membrane is critical for all aspects of sensory transduction, but the regulation of its maintenance is not well understood. In this report, we analyzed the cochlear hair cells of mice with specific deletion of myosin light chain kinase (MLCK) in inner hair cells. MLCK-deficient mice showed impaired hearing, with a 5- to 14-dB rise in the auditory brainstem response (ABR) thresholds to clicks and tones of different frequencies and a significant decrease in the amplitude of the ABR waves. The mutant inner hair cells produced several ball-like structures around the hair bundles in vivo, indicating impaired membrane stability. Inner hair cells isolated from the knockout mice consistently displayed less resistance to hypoosmotic solution and less membrane F-actin. Myosin light-chain phosphorylation was also reduced in the mutated inner hair cells. Our results suggest that MLCK is necessary for maintaining the membrane stability of inner hair cells.
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