MicroRNA-195 prevents dendritic degeneration and neuron death in rats following chronic brain hypoperfusion.

MicroRNA-195 prevents dendritic degeneration and neuron death in rats following chronic brain hypoperfusion.
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MicroRNA-195 可预防大鼠慢性脑灌注不足后的树突变性和神经元死亡

DOI:
10.1038/cddis.2017.243
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发表时间:
2017-06-01
影响因子:
9
通讯作者:
Ai J
Ai J
中科院分区:
生物学1区
文献类型:
--
作者:
Chen X;Jiang XM;Zhao LJ;Sun LL;Yan ML;Tian Y;Zhang S;Duan MJ;Zhao HM;Li WR;Hao YY;Wang LB;Xiong QJ;Ai J

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突触可塑性受损和神经元丢失是阿尔茨海默病和血管性痴呆的标志。在这里,我们发现双侧颈总动脉闭塞(2VO)导致的慢性脑灌注不足(CBH)会减少树突的总长度、数量和交叉度,并导致大鼠海马和皮质中的神经元死亡。它还导致 N 末端 β-淀粉样蛋白前体蛋白 (N-APP) 和死亡受体 6 (DR6) 蛋白水平增加以及 caspase-3 和 caspase-6 的激活。进一步的研究表明,DR6 蛋白因 miR-195 过表达而下调,因 miR-195 抑制而上调,并因结合位点突变和 miR-mask 而无变化。通过慢病毒载体介导的反义分子(lenti-pre-AMO-miR-195)过表达来敲低内源性miR-195,减少了树突的总长度、数量和交叉以及神经元死亡,上调了N-APP和DR6水平,并提高了cleaved caspase-3和caspase-6水平。使用lenti-pre-miR-195过度表达miR-195可以阻止2VO触发的这些变化。我们得出结论,miR-195 通过激活 N-APP/DR6/caspase 通路参与 CBH 诱导的树突变性和神经元死亡。
Impaired synaptic plasticity and neuron loss are hallmarks of Alzheimer’s disease and vascular dementia. Here, we found that chronic brain hypoperfusion (CBH) by bilateral common carotid artery occlusion (2VO) decreased the total length, numbers and crossings of dendrites and caused neuron death in rat hippocampi and cortices. It also led to increase in N-terminal β-amyloid precursor protein (N-APP) and death receptor-6 (DR6) protein levels and in the activation of caspase-3 and caspase-6. Further study showed that DR6 protein was downregulated by miR-195 overexpression, upregulated by miR-195 inhibition, and unchanged by binding-site mutation and miR-masks. Knockdown of endogenous miR-195 by lentiviral vector-mediated overexpression of its antisense molecule (lenti-pre-AMO-miR-195) decreased the total length, numbers and crossings of dendrites and neuron death, upregulated N-APP and DR6 levels, and elevated cleaved caspase-3 and caspase-6 levels. Overexpression of miR-195 using lenti-pre-miR-195 prevented these changes triggered by 2VO. We conclude that miR-195 is involved in CBH-induced dendritic degeneration and neuron death through activation of the N-APP/DR6/caspase pathway.
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