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Neurochem Int:耳蜗连接蛋白26产后表达的减少能够诱导听力损失和影响柱细胞的发育

2019-05-08 AlexYang MedSci原创

GJB2基因(编码耳蜗连接蛋白26(Cx26))中的变异是非综合征耳聋最常见的病因。之前的研究表明了Gjb2基因在耳蜗上皮中的敲除能够引起严重的耳聋,显著的听毛细胞(HC)丧失和支持细胞缺失(一类支持细胞,PCs)。最近,有研究人员建立了Cx26表达呈现梯度减少的不同小鼠模型来调查耳蜗Cx26表达不同水平的减少对听力和PCs发育的影响。根据耳蜗Cx26减少的水平不同,这些模型被命名为高KD组、中K

GJB2基因(编码耳蜗连接蛋白26(Cx26))中的变异是非综合征耳聋最常见的病因。之前的研究表明了Gjb2基因在耳蜗上皮中的敲除能够引起严重的耳聋,显著的听毛细胞(HC)丧失和支持细胞缺失(一类支持细胞,PCs)。

最近,有研究人员建立了Cx26表达呈现梯度减少的不同小鼠模型来调查耳蜗Cx26表达不同水平的减少对听力和PCs发育的影响。根据耳蜗Cx26减少的水平不同,这些模型被命名为高KD组、中KD组和低KD组。在低KD组中,小鼠表现出了正常的听力且PCs发育良好。在高KD组,多达90%的支持细胞(SCs)不表达Cs26。这些小鼠表现出了重度耳聋、快速的听毛细胞退化和PCs发育不良。在中KD组中,将近一半的SCs不表达Cx26。然而,这些小鼠表现出了中度的耳聋和晚发的听毛细胞丧失。更多的是,中KD组中几乎所有的PCs均处于部分分化状态。

最后,研究人员指出,他们的结果表明了耳蜗Cx26产后表达的减少能够以剂量依赖的方式诱发听力损失。在一些SCs中,Cx26能够影响PCs的发育状态和听毛细胞的退化模式。PCs异常的发育模式也许是Gjb2相关听力损失的潜在原因。

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    2019-10-01 linlin2312
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    2019-05-10 ysjykql
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