MicroRNA-135b has a neuroprotective role via targeting of β-site APP-cleaving enzyme 1.

Abstract:

:MicroRNAs (miRs) are a class of endogenous small non-coding RNAs that have been revealed to negatively mediate the expression of their target genes at the post-transcriptional level. Recently, particular miRs have demonstrated an involvement in the pathogenesis of Alzheimer's disease (AD). However, the specific role of miR-135b in AD has yet to be elucidated. The present study aimed to investigate the neuroprotective role of miR-135b, in addition to its underlying mechanism. Herein, reverse transcription-quantitative polymerase chain reaction was conducted to determine miR-135b expression levels in the peripheral blood samples of patients with AD and age-matched normal controls. The data of the present study revealed that the expression levels of miR-135b were significantly reduced in the peripheral blood of AD patients compared with normal controls (P<0.01). In vitro MTT analyses identified that the overexpression of miR-135b significantly enhanced the proliferation of hippocampal cells (P<0.01). Furthermore, in vivo analysis using a Y-maze test indicated that injection with miR-135b mimics into the third ventricle of anesthetized SAMP8 mice significantly enhanced their learning and memory capacities (P<0.01). Molecular mechanism investigations identified β-site APP-cleaving enzyme 1 (BACE1) as a direct target gene of miR-135b, and the latter was identified to negatively mediate the protein expression levels of BACE1 in hippocampal cells, in addition to hippocampal tissues, of SAMP8 mice. Based on the aforementioned findings, we propose that miR-135b has a neuroprotective role via direct targeting of BACE1 and, thus, may be used for the treatment of AD.

journal_name

Exp Ther Med

authors

Zhang Y,Xing H,Guo S,Zheng Z,Wang H,Xu D

doi

10.3892/etm.2016.3366

subject

Has Abstract

pub_date

2016-08-01 00:00:00

pages

809-814

issue

2

eissn

1792-0981

issn

1792-1015

pii

ETM-0-0-3366

journal_volume

12

pub_type

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