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Overexpression of miR-149-5p Attenuates Cerebral Ischemia/Reperfusion (I/R) Injury by Targeting Notch2

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Abstract

Ischemic stroke is one of the leading causes of death and disability worldwide. Although miR-149-5p downregulation is observed in rats after ischemia/reperfusion (I/R) injury, its function and role in ischemic stroke remain unclear. This study aimed to investigate the roles of miR-149-5p in I/R injury. The results showed that miR-149-5p was significantly downregulated in brain tissues of rats subjected to middle cerebral artery occlusion (MCAO) and primary cortical neurons subject to oxygen and glucose deprivation (OGD). MiR-149-5p overexpression effectively reduced MCAO/R-induced infarct volume, neurological score, and brain water content as well as OGD/R-induced cortical neurons apoptosis and OGD/R-induced expression of TNF-α, IL-4, IL-6, IL-1β, and COX-2. Moreover, Notch2 was identified as a target of miR-149-5p and Notch2 overexpression significantly attenuated the inhibitory effects of miR-149-5p mimics on inflammation and apoptosis. Taken together, our study revealed that miR-149-5p overexpression protects the rat brain against I/R injury by regulating Notch2-mediated inflammation and apoptosis pathway.

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The dataset generated during this study is available from the corresponding author upon reasonable request.

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Funding

This work was supported by the Science and Technology Project of Health Commission of Sichuan Province (Grant No. 18PJ430).

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Correspondence to Shali Wang.

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The authors declare no conflict of interest.

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All animal procedures were approved by the Animal Care and Use Committee of Chongqing Medical University.

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Xiaoya Wang and Qingbao Xu contributed equally to this work.

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Wang, X., Xu, Q. & Wang, S. Overexpression of miR-149-5p Attenuates Cerebral Ischemia/Reperfusion (I/R) Injury by Targeting Notch2. Neuromol Med 24, 279–289 (2022). https://doi.org/10.1007/s12017-021-08685-9

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  • DOI: https://doi.org/10.1007/s12017-021-08685-9

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