Low expression of miR‑532‑3p contributes to cerebral ischemia/reperfusion oxidative stress injury by directly targeting NOX2

Mao,Li; Zuo,Mei‑Ling; Wang,Ai‑Ping; Tian,Ying; Dong,Li‑Chen; Li,Tao‑Ming; Kuang,Da‑Bin; Song,Gui‑Lin; Yang,Zhong‑Bao

doi:10.3892/mmr.2020.11325

Low expression of miR‑532‑3p contributes to cerebral ischemia/reperfusion oxidative stress injury by directly targeting NOX2

Authors:
- Li Mao
- Mei‑Ling Zuo
- Ai‑Ping Wang
- Ying Tian
- Li‑Chen Dong
- Tao‑Ming Li
- Da‑Bin Kuang
- Gui‑Lin Song
- Zhong‑Bao Yang
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Affiliations: Office of Good Clinical Practice, The Affiliated Changsha Hospital of Hunan, Normal University, Changsha, Hunan 410006, P.R. China, Institute of Clinical Research, Affiliated Nanhua Hospital, University of South China, Hengyang, Hunan 421001, P.R. China
Published online on: July 10, 2020 https://doi.org/10.3892/mmr.2020.11325
Pages: 2415-2423
Copyright: © Mao et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

NADPH oxidase 2 (NOX2) is a major subtype of NOX and is responsible for the generation of reactive oxygen species (ROS) in brain tissues. MicroRNAs (miRNAs/miRs) are important epigenetic regulators of NOX2. The present study aimed to identify the role of NOX2 miRNA‑targets in ischemic stroke (IS). A rat cerebral ischemia/reperfusion (CI/R) injury model and a SH‑SY5Y cell hypoxia/reoxygenation (H/R) model were used to simulate IS. Gene expression levels, ROS production and apoptosis in tissue or cells were determined, and bioinformatic analysis was conducted for target prediction of miRNA. In vitro experiments, including function‑gain and luciferase activity assays, were also performed to assess the roles of miRNAs. The results indicated that NOX2 was significantly increased in brain tissues subjected to I/R and in SH‑SY5Y cells subjected to H/R, while the expression of miR‑532‑3p (putative target of NOX2) was significantly decreased in brain tissues and plasma. Overexpression of miR‑532‑3p significantly suppressed NOX2 expression and ROS generation in SH‑SY5Y cells subjected to H/R, as well as reduced the relative luciferase activity of cells transfected with a reporter gene plasmid. Collectively, these data indicated that miR‑532‑3p may be a target of NOX2 and a biomarker for CI/R injury. Thus, the present study may provide a novel target for drug development and IS therapy.

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