MicroRNA-638 inhibits cell proliferation by targeting phospholipase D1 in human gastric carcinoma

Jiwei Zhang, Zehua Bian, Jialiang Zhou, Mingxu Song, Zhihui Liu, Yuyang Feng, Li Zhe, Binbin Zhang, Yuan Yin, Zhaohui Huang

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Protein Cell ›› 2015, Vol. 6 ›› Issue (9) : 680-688. DOI: 10.1007/s13238-015-0187-8
RESEARCH ARTICLE
RESEARCH ARTICLE

MicroRNA-638 inhibits cell proliferation by targeting phospholipase D1 in human gastric carcinoma

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Abstract

MicroRNAs (miRNAs) are a type of small non-coding RNAs that are often play important roles in carcinogenesis, but the carcinogenic mechanism of miRNAs is still unclear. This study will investigate the function and the mechanism of miR-638 in carcinoma (GC). The expression of miR-638 in GC and the DNA copy number of miR- 638 were detected by real-time PCR. The effect of miR-638 on cell proliferation was measured by counting kit-8 assay. Different assays, including bioinformatics algorithms (TargetScan and miRanda), luciferase report assay and Western blotting, were used to identify the target gene of miR-638 in GC. The expression of miR-638 target gene in clinical CRC tissues was also validated by immunohistochemical assay. From this research, we found that miR-638 was downregulated in GC tissues compared with corresponding noncancerous tissues (NCTs), and theDNAcopy numberof miR-638waslower in GC than NCTs, which may induce the corresponding downregulation of miR-638 in GC. Ectopic expression of miR-638 inhibited GC cell growth in vitro. Subsequently, we identified that PLD1 is the target gene of miR-638 in GC, and silencing PLD1 expression phenocopied the inhibitory effect of miR-638 on GC cell proliferation. Furthermore, we observed that PLD1 was overexpressed in GC tissues, and high expression of PLD1 in GC predicted poor overall survival. In summary, we revealed that miR- 638 functions as a tumor suppressor in GC through inhibiting PLD1.

Keywords

gastric cancer / miR-638 / cell proliferation / PLD1

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Jiwei Zhang, Zehua Bian, Jialiang Zhou, Mingxu Song, Zhihui Liu, Yuyang Feng, Li Zhe, Binbin Zhang, Yuan Yin, Zhaohui Huang. MicroRNA-638 inhibits cell proliferation by targeting phospholipase D1 in human gastric carcinoma. Protein Cell, 2015, 6(9): 680‒688 https://doi.org/10.1007/s13238-015-0187-8

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2014 This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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