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MicroRNA-519d-3p Inhibits Proliferation and Promotes Apoptosis by Targeting HIF-2α in Cervical Cancer Under Hypoxic Conditions

Lixia Jiang*1, Shaohua Shi†1, Qiaofa Shi, Huijuan Zhang*, Yu Xia§, Tianyu Zhong*

* Department of Laboratory Medicine, First Affiliated Hospital of Gannan Medical University, Ganzhou, Jiangxi, P.R. China
† Department of Information Technology, First Affiliated Hospital of Gannan Medical University, Ganzhou, Jiangxi, P.R. China
‡ Department of Immunology, Medical College of Nanchang University, Nanchang, Jiangxi, P.R. China
§ Gannan Medical University, Ganzhou, Jiangxi, P.R. China
1 These authors provided equal contribution to this work.

Oncology Research 2018, 26(7), 1055-1062. https://doi.org/10.3727/096504018X15152056890500

Abstract

HIF-2α knockdown inhibits proliferation, arrests the cell cycle, and promotes apoptosis and autophagy under hypoxic conditions in cervical cancer. However, the upstream regulatory mechanism of HIF-2α expression is unclear. MicroRNAs (miRNAs) degrade target mRNAs by binding to the 3'-untranslated region of mRNAs. In this study, we investigated the role of miRNAs in the regulation of HIF-2α expression in cervical cancer under hypoxic conditions. miRNAs regulating HIF-2α expression were predicted using TargetScan and miRanda and were determined in cervical cancer under hypoxic conditions by qRT-PCR. Additionally, the targeted regulation of HIF-2α by miR-519d-3p was evaluated by Western blot and luciferase reporter assays. Effects of miR-519d-3p and HIF-2α on cell proliferation, cell cycle, and apoptosis were analyzed by CCK-8 and flow cytometry assays, respectively. miR-106a-5p, miR-17-5p, miR-519d-3p, miR-526b-3p, and miR-20b-5p are potentially regulatory miRNAs that bound to the HIF-2α 3'-untranslated region as per TargetScan and miRanda predictions. Expression of the five miRNAs was inhibited in HeLa cells under hypoxic conditions compared to normoxic conditions, and the expression of miR-519d-3p was lower than that of other miRNAs. Luciferase reporter assays showed that HIF-2α was a target of miR-519d-3p. Additionally, miR-519d-3p overexpression inhibited cell proliferation, arrested the cell cycle transition from the G1 stage to the S stage, and promoted cell apoptosis under hypoxic conditions in cervical cancer. HIF-2α overexpression partially reversed the effect of miR-519d-3p. In conclusion, miR-519d-3p overexpression suppressed proliferation, inhibited the cell cycle, and promoted apoptosis of HeLa cells by targeting HIF-2α under hypoxic conditions.

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Cite This Article

APA Style
Jiang, L., Shi, S., Shi, Q., Zhang, H., Xia, Y. et al. (2018). Microrna-519d-3p inhibits proliferation and promotes apoptosis by targeting HIF-2α in cervical cancer under hypoxic conditions. Oncology Research, 26(7), 1055-1062. https://doi.org/10.3727/096504018X15152056890500
Vancouver Style
Jiang L, Shi S, Shi Q, Zhang H, Xia Y, Zhong T. Microrna-519d-3p inhibits proliferation and promotes apoptosis by targeting HIF-2α in cervical cancer under hypoxic conditions. Oncol Res. 2018;26(7):1055-1062 https://doi.org/10.3727/096504018X15152056890500
IEEE Style
L. Jiang, S. Shi, Q. Shi, H. Zhang, Y. Xia, and T. Zhong "MicroRNA-519d-3p Inhibits Proliferation and Promotes Apoptosis by Targeting HIF-2α in Cervical Cancer Under Hypoxic Conditions," Oncol. Res., vol. 26, no. 7, pp. 1055-1062. 2018. https://doi.org/10.3727/096504018X15152056890500



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