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

Abstract：

: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.

journal_name

Cell Death Dis

journal_title

Cell death & disease

authors

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

doi

10.1038/cddis.2017.243

subject

Has Abstract

pub_date

2017-06-01 00:00:00

pages

e2850

issue

6

issn

2041-4889

pii

cddis2017243

journal_volume

8

pub_type

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