Severe vestibular dysfunction and altered vestibular innervation in mice lacking prosaposin.

Severe vestibular dysfunction and altered vestibular innervation in mice lacking prosaposin.
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DOI:
10.1016/j.neures.2012.01.007
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发表时间:
2012-04
影响因子:
2.9
通讯作者:
Lustig LR
Lustig LR
中科院分区:
医学4区
文献类型:
--
作者:
Akil O;Lustig LR

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鞘脂激活蛋白原(Prosaposin)是溶酶体水解酶的四种糖蛋白激活剂(鞘脂激活蛋白A、B、C和D)的前体,先前已显示对正常成人耳蜗神经支配和正常听力的维持是重要的。在这些研究中,我们现在研究正常前庭上皮中的鞘脂激活蛋白原和鞘脂激活蛋白原消融引起的平衡功能障碍。在正常小鼠中,通过RT-PCR、Western印迹分析和免疫荧光,saposin原定位于所有3个前庭终末器官(壶腹、球囊和椭圆囊)和斯卡帕神经节。在一系列行为任务中,鞘脂激活蛋白原功能的消融引起了严重的前庭功能障碍。在组织学上,KO小鼠表现出前庭毛细胞下方的旺盛细胞增殖,伴随支持细胞的破坏。电子显微镜进一步显示包涵体和细胞增殖干扰前庭终末器官的正常神经上皮结构。最后,免疫荧光(神经丝200和突触素)染色表明,这种细胞增殖对应于传入和传出神经元的过度生长。这些数据表明,saposin不仅在正常听力的维持中起作用,而且在前庭感觉上皮的神经元成熟过程和正常前庭系统功能的维持中也起重要作用。
Prosaposin, a precursor of four glycoprotein activators (Saposin A, B, C and D) for lysosomal hydrolases, has previously been shown to be important for normal adult cochlear innervation and the maintenance of normal hearing. In these studies, we now investigate prosaposin in normal vestibular epithelium and the functional impairment of balance caused by prosaposin ablation. In normal mice, prosaposin is localized to all 3 vestibular end-organs (ampullae, saccule, and utricle) and Scarpa’s ganglion by RT-PCR, Western blot analysis and immunofluorescence. Ablation of prosaposin function caused severe vestibular dysfunction on a battery of behavioral tasks. Histologically, the KO mice demonstrated an exuberant cellular proliferation below the vestibular hair cells with disruption of the supporting cells. Electron microscopy further demonstrated inclusion bodies and cellular proliferation disturbing the normal neuroepithelial structure of the vestibular end-organs. Lastly, immunofluorescence (neurofilament 200 and synaptophysin) staining suggests that this cellular proliferation corresponds to afferent and efferent neuronal overgrowth. These data suggest that prosaposin plays a role not only in the maintenance of normal hearing but also an important role in the neuronal maturation processes of the vestibular sensory epithelium and the maintenance of normal vestibular system function.
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