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Dexmedetomidine Attenuates Neuroinflammation In LPS-Stimulated BV2 Microglia Cells Through Upregulation Of miR-340

Authors Bao Y, Zhu Y, He G, Ni H, Liu C, Ma L, Zhang L, Shi D

Received 29 March 2019

Accepted for publication 30 August 2019

Published 3 October 2019 Volume 2019:13 Pages 3465—3475

DOI https://doi.org/10.2147/DDDT.S210511

Checked for plagiarism Yes

Review by Single-blind

Peer reviewers approved by Dr Amy Norman

Peer reviewer comments 2

Editor who approved publication: Dr Qiongyu Guo


Yang Bao,1,* Yijun Zhu,1,* Guangbao He,1 Hongwei Ni,1 Chenxia Liu,1 Limin Ma,1 Lifeng Zhang,2 Dongping Shi1

1Department of Anesthesiology, Jiading District Central Hospital Affiliated Shanghai University of Medicine & Health Sciences, Shanghai 201800, People’s Republic of China; 2Department of Anesthesiology, Jiading Maternal and Child Health Hospital, Shanghai 201821, People’s Republic of China

*These authors contributed equally to this work

Correspondence: Dongping Shi
Department of Anesthesiology, Jiading District Central Hospital Affiliated Shanghai University of Medicine & Health Sciences, No.1 Chengbei Road, Jiading District, Shanghai, Shanghai 201800, People’s Republic of China
Email dongpingshi@yandex.com

Lifeng Zhang
Department of Anesthesiology, Jiading Maternal and Child Health Hospital, No 1216 Gaotai Road, Jiading District, Shanghai, Shanghai 201821, People’s Republic of China
Email zhanglifeng2019@126.com

Background: Dexmedetomidine (Dex) was reported to exhibit anti-inflammatory effect in the nervous system. However, the mechanism by which Dex exhibits anti-inflammation effects on LPS-stimulated BV2 microglia cells remains unclear. Thus, this study aimed to investigate the role of Dex in LPS-stimulated BV2 cells.
Methods: The BV2 cells were stimulated by lipopolysaccharides (LPS). BV2 cells were infected with short-hairpin RNAs targeting NF-κB (NF-κB-shRNAs) and NF-κB overexpression lentivirus, respectively. In addition, miR-340 mimics or miR-340 inhibitor was transfected into BV2 cells, respectively. Meanwhile, the dual-luciferase reporter system assay was used to explore the interaction of miR-340 and NF-κB in BV2 cells. CCK-8 was used to detect the viability of BV2 cells. In addition, Western blotting was used to detect the level of NF-κB in LPS-stimulated BV2 cells. The levels of TNF-α, IL-6, IL-1β, IL-2, IL-12, IL-10 and MCP-1 in LPS-stimulated BV2 cells were measured with ELISA.
Results: The level of miR-340 was significantly upregulated in Dex-treated BV2 cells. Meanwhile, the level of NF-κB was significantly increased in BV2 cells following infection with lenti-NF-κB, which was markedly reversed by Dex. LPS markedly increased the expression of NF-κB and proinflammatory cytokines in BV2 cells, which were reversed in the presence of Dex. Moreover, miR-340 mimics enhanced the anti-inflammatory effects of Dex in LPS-stimulated BV2 cells via inhibiting NF-κB and proinflammatory cytokines. Furthermore, Dex obviously inhibited LPS-induced phagocytosis in BV2 cells.
Conclusion: Taken together, our results suggested that Dex might exert anti-inflammatory effects in LPS-stimulated BV2 cells via upregulation of miR-340. Therefore, Dex might serve as a potential agent for the treatment of neuroinflammation.

Keywords: NF-κB, dexmedetomidine, BV2 microglia cells, postoperative cognitive dysfunction

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