A neuroprotective phase precedes striatal degeneration upon nucleolar stress.

A neuroprotective phase precedes striatal degeneration upon nucleolar stress.
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DOI:
10.1038/cdd.2013.66
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发表时间:
2013-11
影响因子:
12.4
通讯作者:
--
中科院分区:
生物学1区
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--
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核仁通过稳定P53而参与对细胞压力的感知和反应。P53的促凋亡作用与几种神经退行性疾病有关,包括亨廷顿病(HD),该病的特征是纹状体中的中棘神经元(MSN)进行性丧失。在这里,我们表明核仁完整性和功能的破坏导致核仁应激,这是R6/2小鼠MSN的早期事件,R6/2小鼠是HD的转基因模型。通过条件性敲除RNA聚合酶I特异性转录起始因子IA(TIF-IA)来靶向干扰MSN中的核仁功能会导致晚期进行性纹状体变性、HD样运动异常和分子特征。值得注意的是,p53通过瞬时上调10号染色体上缺失的磷酸酶和张力蛋白同源基因(PTEN)来延长TIF-IA缺陷MSN的神经元存活时间,PTEN是一种肿瘤抑制因子,可以抑制雷帕霉素信号转导的哺乳动物靶点,并诱导自噬。这些结果强调了核仁应激在神经退行性变中的初始作用,并揭示了依赖于P53/PTEN的神经保护反应。
The nucleolus is implicated in sensing and responding to cellular stress by stabilizing p53. The pro-apoptotic effect of p53 is associated with several neurodegenerative disorders, including Huntington's disease (HD), which is characterized by the progressive loss of medium spiny neurons (MSNs) in the striatum. Here we show that disruption of nucleolar integrity and function causes nucleolar stress and is an early event in MSNs of R6/2 mice, a transgenic model of HD. Targeted perturbation of nucleolar function in MSNs by conditional knockout of the RNA polymerase I-specific transcription initiation factor IA (TIF-IA) leads to late progressive striatal degeneration, HD-like motor abnormalities and molecular signatures. Significantly, p53 prolongs neuronal survival in TIF-IA-deficient MSNs by transient upregulation of phosphatase and tensin homolog deleted on chromosome 10 (PTEN), a tumor suppressor that inhibits mammalian target of rapamycin signaling and induces autophagy. The results emphasize the initial role of nucleolar stress in neurodegeneration and uncover a p53/PTEN-dependent neuroprotective response.
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