Long non-coding RNA THRIL inhibits miRNA-24-3p to upregulate neuropilin-1 to aggravate cerebral ischemia-reperfusion injury through regulating the nuclear factor κB p65 signaling

Purpose: The aim of this study was to investigate the role of the tumor necrosis factor and HNRNPL related immunoregulatory long non-coding RNA (THRIL) in cerebral ischemia-reperfusion injury. Methods: A rat middle cerebral artery occlusion/ischemia-reperfusion (MCAO/IR) model and an oxygen glucose deprivation/reoxygenation (OGD/R) cell model were constructed. THRIL was knocked down using siTHRIL. Neurological deficit score was detected based on the criteria of Zea-Longa. Brain region 2,3,5-Triphenyltetrazolium (TTC) staining and quantitative analysis of cerebral infarction volume, RT-qPCR, and fluorescence immunostaining were performed for assessing THRIL expression. MTT assay was used to detect the cell proliferation ability after transfection, TUNEL assay was applied to detect apoptosis, and western blot and ELISA detected related protein expression. A dual luciferase reporter system and RIP assay were used to confirm the target relationship. Results: THRIL was upregulated in both in vitro and in vivo models of brain ischemia-reperfusion injury. Knockdown of THRIL attenuated OGD/R neuronal apoptosis and OGD/R-induced inflammation. THRIL targeted and regulated the expression of miR-24-3p/neuropilin-1 (NRP1) axis. THRIL silencing significantly improved the neurological functioning of rats in the MCAO/R model by miR-24-3p/NRP1/NF-κB p65 signaling pathway. Conclusion: THRIL could aggravate cerebral ischemia-reperfusion injury by competitively binding to miR-24-3p to promote the upregulation of NRP1 and further promoted the activation of the NF-κB p65 signaling pathway.

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