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Chunting Hu,Chen Li,Qiaoya Ma,Ruili Wang,Ya He,Hui Wang,Guo-gang Luo 연세대학교의과대학 2021 Yonsei medical journal Vol.62 No.4
Purpose: Ischemic brain injury results in high mortality and serious neurologic morbidity. Here, we explored the role of SNHG15in modulating neuronal damage and microglial inflammation after ischemia stroke. Materials and Methods: The hypoxia/ischemia models were induced by middle cerebral artery occlusion in mice and oxygenglucosedeprivation/reoxygenation (OGD/R) in vitro. Quantitative real-time PCR (qRT-PCR) and Western blot were conducted todetermine the levels of SNHG15, miR-302a-3p, and STAT1/NF-κB. Moreover, gain- or loss-of functional assays of SNHG15 and miR-302a-3p were conducted. MTT assay was used to evaluate the viability of HT22 cells, and the apoptotic level was determined byflow cytometry. Furthermore, enzyme-linked immunosorbent assay was performed to detect oxidative stress and inflammatorymediators in the ischemia cortex and OGD/R-treated BV2 microglia. Results: The SNHG15 and STAT1/NF-κB pathways were both distinctly up-regulated, while miR-302a-3p was notably down-regulatedin the ischemia cortex. Additionally, overexpressing SNHG15 dramatically enhanced OGD/R-mediated neuronal apoptosisas well as the expression of oxidative stress and inflammation factors from microglia. In contrast, knocking down SNHG15 or overexpressingmiR-302a-3p relieved OGD/R-mediated neuronal apoptosis and microglial activation. Moreover, the rescue experimenttestified that overexpressing miR-302a-3p also attenuated SNHG15 up-regulation-induced effects. In terms of the mechanisms,SNHG15 sponged miR-302a-3p and activated STAT1/NF-κB as a competitive endogenous RNA, while miR-302a-3p targetedSTAT1 and negatively regulated the STAT1/NF-κB pathway. Conclusion: SNHG15 was up-regulated in the hypoxia/ischemia mouse or cell model. The inhibition of SNHG15 ameliorates ischemia/hypoxia-induced neuronal damage and microglial inflammation by regulating the miR-302a-3p/STAT1/NF-κB pathway.