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Mechanism of miR-320 in Regulating Biological Characteristics of Ischemic Cerebral Neuron by Mediating Nox2/ROS Pathway

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Abstract

This study aimed to explore the mechanism of miR-320 in regulating biological characteristics of ischemic cerebral neuron by mediating Nox2/ROS pathway. Primary neurons were cultured and grouped: normal group (normal primary neurons), negative control (NC) group (ischemic primary neurons, transfected with negative control plasmid), model group (ischemic primary neurons), miR-320 mimic group (ischemic primary neurons, transfected with miR-320-overexpressed plasmid), Nox2 vector group (ischemic primary neurons, transfected with Nox2-overexpressed plasmid), and miR-320 mimic + Nox2 vector group (ischemic primary neurons, co-transfected with miR-320- and Nox2-overexpressed plasmid). Dual-luciferase reporter assay showed that there was the target relationship between miR-320 and Nox2. miR-320 expression was significantly decreased, and Nox2 expression was significantly increased in the rest groups compared with normal group (both P < 0.05). There was a co-localization of miR-320 and Nox2 in the cytoplasm. Cell proliferation, contents of superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GSH-PX), and mRNA and protein expressions of Ki67, Bcl-2, and c-myc were significantly declined, and apoptosis rate, contents of malondialdehyde (MDA) and reactive oxygen species (ROS), and caspase-3 mRNA and protein expressions were significantly increased in the rest groups compared with normal group (all P < 0.05). miR-320 promoted cell proliferation; increased contents of SOD, CAT, and GSH-PX; and declined apoptosis and contents of MDA and ROS. Moreover, miR-320 could affect the regulation of Nox2/ROS pathway on ischemic cerebral neuron by negatively regulating Nox2 expression. Overexpressed miR-320 affects the proliferation, apoptosis, and oxidative stress injury of ischemic cerebral neuron by inhibiting Nox2/ROS pathway.

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Funding

This work was supported by the Nature Science Foundation Project of Ningbo (No. 2018A610306).

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Authors and Affiliations

  1. Department of Neurosurgery, Beilun People’s Hospital in Ningbo, Ningbo, 315800, Zhejiang, China

    Wei Shen, Yigao Lu, Jun’an Hu, Haiwei Le, Wei Yu, Weihua Xu & Wangfang Yu

  2. Department of Neurosurgery, The First Affiliated Hospital of Zhejiang University, No. 79 Qingchun Road, Hangzhou, 310003, Zhejiang, China

    Jiesheng Zheng

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  1. Wei Shen
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  2. Yigao Lu
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  3. Jun’an Hu
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  4. Haiwei Le
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  5. Wei Yu
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  6. Weihua Xu
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  7. Wangfang Yu
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Correspondence to Jiesheng Zheng.

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Shen, W., Lu, Y., Hu, J. et al. Mechanism of miR-320 in Regulating Biological Characteristics of Ischemic Cerebral Neuron by Mediating Nox2/ROS Pathway. J Mol Neurosci 70, 449–457 (2020). https://doi.org/10.1007/s12031-019-01434-5

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