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AGING CELL:人类细胞中的α-突触核蛋白毒性是如何引起的?

2019-04-12 海北 MedSci原创

α-突触核蛋白(aSyn)毒性与细胞周期改变,DNA损伤反应的激活(DDR)和自噬的失调有关。然而,至今为止,这些现象之间的关系仍然很大程度上未知。

α-突触核蛋白(aSyn)毒性与细胞周期改变,DNA损伤反应的激活(DDR)和自噬的失调有关。然而,至今为止,这些现象之间的关系仍然很大程度上未知。

最近,研究人员证明,在aSyn毒性和衰老的酵母模型中,aSyn表达诱导Ras2依赖性生长信号传导,细胞周期的重新进入,DDR激活,自噬和核糖核苷酸还原酶1(Rnr1)的自噬降解,这是一种核糖核苷酸还原酶和dNTP合成的活性必须的蛋白质。这些事件导致细胞死亡和衰老。通过删除RAS2,抑制DDR或自噬,或过表达RNR1可以消除这些事件。

人H4神经胶质瘤细胞中的aSyn表达也诱导细胞周期再进入和S期阻滞,自噬和RRM1(RNR1的人类同源物)的降解。此外,抑制RRM1的自噬降解可以从细胞死亡中拯救细胞。

该研究结果代表了一种毒性的模型,对于了解突触核蛋白病,以及其他与年龄相关的神经退行性疾病具有重要意义。


原始出处:

Belém Sampaio‐Marque et al. α‐Synuclein toxicity in yeast and human cells is caused by cell cycle re‐entry and autophagy degradation of ribonucleotide reductase 1. AGING CELL, 2019; doi:  https://doi.org/10.1111/acel.12922


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    2020-02-26 维他命
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