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首页> 外文期刊>Cell and Tissue Research >Protein expression of pigment-epithelium-derived factor in rat cochlea.
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Protein expression of pigment-epithelium-derived factor in rat cochlea.

机译:色素上皮衍生因子在大鼠耳蜗中的蛋白表达。

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摘要

Pigment-epithelium-derived factor (PEDF) is a 50-kDa glycoprotein with well-recognised expression in various mammalian organs showing diverse (e.g. anti-angiogenic and neuroprotective) activities. However, at present, no information is available regarding the potential function of this cytokine in the inner ear. As a first approach to investigating whether PEDF is involved in cochlear function, we have explored its protein expression in the rat cochlea by immunocytochemistry. Our results show that PEDF expression in the cochlea is most prominent in the basilar membrane below the organ of Corti, in the lateral wall (especially in the stria vascularis), in ganglion neurons, and in the endothelia of blood vessels. Our findings on its distribution in the cochlea suggest that PEDF in the basilar membrane prevents blood vessel formation that would disturb cochlear micromechanics and would interfere with the mechano-electrical transduction in the organ of Corti. In cochlear ganglion neurons, PEDF might serve a neuroprotective function possibly protecting these neurons from excessive glutamate released by the inner hair cells. Our data constitute the first report on the morphological protein distribution of this multifunctional molecule in the rat cochlea and suggest its role in important functions of the internal ear.
机译:色素上皮衍生因子(PEDF)是一种50 kDa的糖蛋白,在各种哺乳动物器官中均得到公认的表达,显示出多种(例如抗血管生成和神经保护)活性。但是,目前尚无有关该细胞因子在内耳中潜在功能的信息。作为研究PEDF是否参与耳蜗功能的第一种方法,我们已经通过免疫细胞化学探索了其在大鼠耳蜗中的蛋白表达。我们的结果表明,PEDF在耳蜗中的表达在Corti器官下方的基底膜,侧壁(尤其是在血管纹),神经节神经元和血管内皮中最为突出。我们关于其在耳蜗中的分布的发现表明,基底膜中的PEDF阻止了血管的形成,而血管的形成会干扰耳蜗的微力学并干扰Corti器官中的机电转换。在耳蜗神经节神经元中,PEDF可能具有神经保护功能,可能保护这些神经元免受内部毛细胞释放的过量谷氨酸的影响。我们的数据构成了该多功能分子在大鼠耳蜗中形态蛋白分布的首次报道,并暗示了其在内耳重要功能中的作用。

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