microRNA-488 inhibits chemoresistance of ovarian cancer cells by targeting Six1 and mitochondrial function
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Zhuo Yang1, ZiYi Feng2, JiaHui Gu1, XinHui Li1, QianZhe Dong3, KuiRan Liu1, Yan Li1 and Ling OuYang1
1Department of Obstetrics and Gynecology, Shengjing Hospital Affiliated to China Medical University, Heping District, Shenyang, Liaoning, People’s Republic of China
2China Medical University, Shenbei New District, Shenyang, Liaoning, People’s Republic of China
3Department of Pathology, China Medical University, Shenbei New District, Shenyang, Liaoning, People’s Republic of China
Zhuo Yang, email: email@example.com
Keywords: ovarian cancer, miR-488, Six1, mitochondrial dynamics, Drp1
Abbreviations: CCK8: Cell Counting Kit-8; ROS: reactive oxygen species
Received: April 18, 2017 Accepted: July 12, 2017 Published: September 15, 2017
Dysregulation of miR-488 has been implicated in several human cancers. In this study, we aim to explore its expression and biological function in ovarian cancers. We found miR-488 expression was downregulated in ovarian cancer tissues. Using CCK8 and colony formation assay showed that miR-488 inhibited SKOV3 cell proliferation and colony formation, with downregulation of cyclin D1 and cyclin E protein. While miR-488 inhibitor promoted OVCAR3 cell growth and colony formation. Cell viability and Annexin V/PI staining showed that miR-488 downregulated cell survival and increased apoptosis rate when treated with cisplatin and paclitaxel. Further experiments using MitoTracker and JC-1 staining indicated that miR-488 regulated mitochondrial fission/fusion balance and inhibited mitochondrial membrane potential, with p-Drp1, Drp1 and Fis1 downregulation. Luciferase reporter assay showed that Six1 is a target of miR-488. We also found a negative association between Six1 and miR-488 in ovarian cancer tissues. In addition, Six1 overexpression induced mitochondrial fission and increased mitochondrial potential, with upregulation of Drp1 signaling. Six1 depletion showed the opposite effects. Restoration of Six1 in SKOV3 cells rescued decreased p-Drp1 and Drp1 expression induced by miR-488 mimic. Six1 plasmid also reversed the effects of miR-488 on chemoresistance and apoptosis. Taken together, the present study showed that, by targeting Six1, miR-488 inhibits chemoresistance of ovarian cancer cells through regulation of mitochondrial function.
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