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        MiR-124 regulates apoptosis in hypoxia-induced human brain microvessel endothelial cells through targeting Bim

        Jie Pu,Yuan Long,Jian Zhou,Yanqiang Zhan,Xiaoyong Qin 한국응용생명화학회 2018 Applied Biological Chemistry (Appl Biol Chem) Vol.61 No.6

        Human brain microvessel endothelial cells (HBMECs) are crucial for brain vascular repair and maintenance. The high-expressed expressions of micro- RNA-124 (miR-124) in brain have been investigated and revealed in many researches. In this work, we aimed to investigate the role of miR-124 in apoptosis of HBMECs and the underlying mechanism. Here, we found the lowexpressed miR-124 in hypoxia-induced HBMECs using qRT-PCR analysis. MiR-124 targeting 30-untranslated region (30-UTR) of Bim mRNA was predicted by Targetscan database. Importantly, the decreased miR-124 expression and increased Bim expression, an opposite trend, were obtained in hypoxia-induced HBMECs. The further confirmation of the correlation between miR-124 and Bim was conducted by miR-124 overexpression and dual luciferase reporter assays. The inhibitory role of miR- 124 in Bim expression was evidenced by results obtained from miR-124 overexpression analysis. Luciferase reporter assay further proved that miR-124 directly targeted the two conserved seed sites in the Bim 30-UTR. The inhibited apoptosis of HBMECs was observed under both miR-124 overexpression and Bim knockdown condition in flow cytometry analysis. Collectively, these findings outline that miR-124 regulates apoptosis in hypoxia-induced HBMECs through targeting Bim, providing a better understanding of the role of miR-124 in apoptosis of HBMECs.

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