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08 June 2020 : Clinical Research  

miR-325-3p Overexpression Inhibits Proliferation and Metastasis of Bladder Cancer Cells by Regulating MT3

Shaopeng Sun1ADE*, Feng Liu1BF, Shaozhong Xian1CD, Dawei Cai1BD

DOI: 10.12659/MSM.920331

Med Sci Monit 2020; 26:e920331

Abstract

BACKGROUND: miRNAs have been widely used in cancer treatment. Our study was designed to explore the effects of miR-325-3p in bladder cancer cells.

MATERIAL AND METHODS: Levels ofd miR-325-3p and MT3 in bladder cancer tissues and cells were assessed by quantitative real-time polymerase chain reaction (qRT-PCR). miR-325-3p mimics were transfected into bladder cancer T24 cells, and cell migration and invasion rates and cell proliferation were assessed by transwell assay and Cell Counting Kit-8 (CCK-8). The target mRNA for miR-325-3p was predicted by Targetscan7.2 and confirmed by dual-luciferase reporter assay. More experiments were performed to confirm the effects of miR-325-3p and MT3 in T24 cells. Additionally, the levels of TIMP-2, MMP9, and E-cadherin were assessed by Western blotting to identify the effects of miR-325-3p and MT3 on epithelial-mesenchymal transition (EMT).

RESULTS: miR-325-3p expression was reduced and MT3 was increased in bladder cancer tissues and bladder cancer cells. miR-325-3p mimics suppressed cell proliferation ability and invasion and migration rates of T24 cells. Moreover, miR-325-3p was confirmed to target MT3. Further experiments showed that the effects of increased cell proliferation, invasion, migration, and EMT promoted by MT3 overexpression were abolished by miR-325-3p mimics, proving that miR-325-3p is a tumor suppressor through targeting MT3 in bladder cancer cells.

CONCLUSIONS: Downregulation of miR-325-3p in bladder cancer regulates cell proliferation, migration, invasion, and EMT by targeting MT3. Furthermore, miR-325-3p is a potential therapeutic target in treating bladder cancer.

Keywords: Cell Proliferation, metallothionein, MicroRNAs, Neoplasm Metastasis, Urinary Bladder Neoplasms, Apoptosis, Cell Movement, Epithelial-mesenchymal transition, Gene Expression Regulation, Neoplastic, Matrix Metalloproteinase 16, Neoplasm Invasiveness, RNA, Messenger, Urinary Bladder

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750