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PNAS:UCHL1影响脑缺血后的损伤和功能恢复

2019-02-16 海北 MedSci原创

泛素C-末端水解酶L1(UCHL1)是一种独特的脑特异性去泛素化酶。 UCHL1的突变和异常功能与许多神经系统疾病有关。

泛素C-末端水解酶L1(UCHL1)是一种独特的脑特异性去泛素化酶。 UCHL1的突变和异常功能与许多神经系统疾病有关。 UCHL1活性保护神经元免受缺氧损伤,并且中风诱导的反应性脂质物质与UCHL1的半胱氨酸152(C152)的结合使得UCHL1去折叠,并破坏其功能。

为了研究UCHL1的作用,及反应性脂质如何影响其在缺血性损伤后功能的修复中的作用,研究人员构建了表达UCHL1 C152A突变的敲入(KI)小鼠。

来自KI小鼠的神经元在缺氧后具有较少的细胞死亡和神经突损伤。 UCHL1 C152A KI和WT小鼠经历大脑中动脉闭塞(MCAO)或假手术。与MCAO后7天的WT小鼠相比,KI的白质损伤显着降低。组织学分析显示KI小鼠在损伤后21天组织损失减少。在缺血后,KI小鼠中也有显着改善的感觉运动恢复。在MCAO后24小时,K63-和K48-连接的多聚泛素化蛋白在WT小鼠脑的半影中增加,但在KI小鼠脑中没有增加。

UCHL1 C152A突变保留兴奋性突触驱动锥体神经元及其在周围区域的兴奋性。MCAO后21天,在KI小鼠的胼胝体中轴突传导速度恢复。

这些结果表明,UCHL1活性是缺血后功能的重要决定因素,并进一步证明UCHL1的C152位点在中风后的功能恢复中起重要作用。


原始出处:

Liu H et al. Role of UCHL1 in axonal injury and functional recovery after cerebral ischemia. PNAS, 2019; doi: 10.1073/pnas.1821282116


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    2019-11-18 drwjr
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    2019-02-18 mnda

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