miR-33a inhibits cell growth in renal cancer by downregulation of MDM4 expression.

Abstract:

BACKGROUND:MicroRNA-33a (miR-33a) plays the role of the tumor suppressor gene by regulating the expression level of downstream genes. However, the effects of miR-33a in renal cell cancer (RCC) remain unknown. Our study was designed to investigate the expression level and potential function of miR-33a in RCC. METHODS:RT-qPCR was applied to measure the levels of miR-33a in RCC tissues and cell lines. Western blotting and luciferase reporter assay were used to detect the relationship between miR-33a and Mouse double minute 4 (MDM4) in RCC cells. CCK-8 and flow cytometry were applied to detected cell viability and cell cycle. Animal models and TUNEL assay were applied to detect the effect of miR-33a on the growth of RCC and cell apoptosis. RESULTS:We found that the levels of miR-33a were significantly decreased in RCC tissues and cell lines. Moreover, the low expression of miR-33a in RCC patients indicated a shorter overall survival (OS). Notably, MDM4 as a direct target of miR-33a in RCC, the expression level of MDM4 was significantly increased in RCC cells group than the control group. Furthermore, miR-33a overexpression significantly inhibited RCC cells growth than the control group, while the inhibitory effects of miR-33a were reversed upon the overexpression of MDM4. Luciferase reporter assays showed that there was a direct interaction between miR-33a and 3' UTR of MDM4 mRNA. In vivo, tumor volumes and weight were significantly decreased in the transfected miR-33a mimics group than the control group. CONCLUSION:Taken together, our study indicates that miR-33a inhibits RCC cell growth by targeting MDM4.

journal_name

Mol Genet Genomic Med

authors

Jiang K,Sun F,Zhu J,Luo G,Ban Y,Zhang P

doi

10.1002/mgg3.833

subject

Has Abstract

pub_date

2019-08-01 00:00:00

pages

e833

issue

8

issn

2324-9269

journal_volume

7

pub_type

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