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Overexpression of MALAT1 contributes to cervical cancer progression by acting as a sponge of miR-429.
Journal of Cellular Physiology 2018 December 5
Cervical cancer remains a malignant type of tumor and is the fourth leading cause of cancer-related death among females. MALAT1 has been identified as a tumor oncogene in various cancers. Our present study aimed to explore the biological role of MALAT1 in cervical cancer. We observed that MALAT1 was significantly upregulated in human cervical cancer cell lines compared with the ectocervical epithelial cells. MALAT1 was repressed by transfection with LV-shMALAT1, whereas increased by LV-MALAT1 in HeLa and Caski cells. Silencing of MALAT1 obviously reduced cervical cell viability, induced cell apoptosis, and repressed cell invasion capacity. Conversely, overexpression of MALAT1 exhibited an opposite phenomenon. Furthermore, miR-429 was predicted as a direct target of MALAT1, and it was dramatically decreased in cervical cancer cells. It has been shown that miR-429 plays a crucial role in cervical cancer progression. In our current study, the targeting correlation between MALAT1 and miR-429 was confirmed by luciferase reporter assays and RIP experiments. Finally, in vivo animal models were established, and we indicated that MALAT1 inhibited cervical cancer progression via targeting miR-429. These findings revealed that MALAT1 can sponge miR-429 and regulate cervical cancer pathogenesis in vivo and in vitro. In conclusion, we indicated that the MALAT1/miR-429 axis was involved in cervical cancer development.
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