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

• Published in: Molecular medicine reports Vol. 22; no. 3; pp. 2415 - 2423
• Main Authors: 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
• Format: Journal Article
• Language: English
• Published: Greece Spandidos Publications 01.09.2020; Spandidos Publications UK Ltd; D.A. Spandidos
• Subjects: 3' Untranslated Regions; Analysis; Animals; Apoptosis; Biomarkers - metabolism; Biotechnology; Body temperature; Brain - metabolism; Brain Ischemia - genetics; Brain Ischemia - metabolism; Brain research; Carotid arteries; Cell Line; CYBB protein; Disease Models, Animal; Down-Regulation; Drug development; Enzymes; Epigenetic inheritance; Experiments; Gene expression; Gene Expression Profiling; Humans; Hypoxia; Ischemia; Laboratory animals; Male; MicroRNA; MicroRNAs; MicroRNAs - genetics; miRNA; NAD(P)H oxidase; NADPH Oxidase 2 - genetics; NADPH Oxidase 2 - metabolism; Oxidases; Oxidative stress; Pathogenesis; Rats; Reactive oxygen species; Reactive Oxygen Species - metabolism; Reperfusion; Reporter gene; Roles; Scientific equipment industry; Stroke; Traumatic brain injury; Veins & arteries; Vital signs; United States
• ISSN: 1791-2997; 1791-3004
• DOI: 10.3892/mmr.2020.11325

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.