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J BUON. 2019 Jan-Feb;24(1):249-255.

MicroRNA-140 inhibits proliferation and promotes apoptosis and cell cycle arrest of prostate cancer via degrading SOX4.

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Department of Urology, The First Affiliated Hospital of Jinan University, Guangzhou 510630, China.



To explore the regulatory roles of microRNA-140 and SOX4 in prostate cancer (PCa) tissues and paracancerous tissues, and their underlying mechanism.


MicroRNA-140 expressions in PCa tissues, paracancerous tissues and PCa cell lines were detected by quantitative real-time polymerase chain reaction (qRT-PCR). Proliferation, apoptosis and cell cycle of PCa cells after altering expressions of microRNA-140 and SOX4 were detected by MTT assay and flow cytometry, respectively. The regulatory effect of microRNA-140 on SOX4 was detected by Western blot and qRT-PCR. The binding condition of microRNA-140 on SOX4 was verified by luciferase reporter gene assay.


MicroRNA-140 was downregulated in PCa tissues compared to paracancerous tissues. In particular, lower expression of microRNA-140 was found in PCa with Grade I+II compared to Grade III+IV. In vitro, microRNA-140 expression was negatively correlated with proliferative and invasive abilities, while positively correlated with apoptosis of PCa cells. MicroRNA-140 promoted cell cycle arrest in G0/G1 phase. SOX4 expression was inhibited by microRNA-140 overexpression in PCa cells.


Downregulated microRNA-140 promotes proliferation and cell cycle arrest, but inhibits apoptosis of PCa cells. MicroRNA-140 inhibits PCa development via degrading SOX4.


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