Int J Biol Sci 2018; 14(6):644-653. doi:10.7150/ijbs.25272 This issue

Research Paper

MiR-152-5p as a microRNA passenger strand special functions in human gastric cancer cells

Wendao You1, Xing Zhang1, Mengyue Ji1, Yang Yu1, Chen Chen1, Yujia Xiong1, Yiting Liu1, Yibin Sun1, Chenhuan Tan1, Hanshuo Zhang2, Jie Li3, Weichang Chen1, Rui Li1✉

1. Department of Gastroenterology, the First Affiliated Hospital of Soochow University, Suzhou 215006, China.
2. GenoArray Biotech, Suzhou, China
3. Genex Health Co., Ltd, Beijing, China

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You W, Zhang X, Ji M, Yu Y, Chen C, Xiong Y, Liu Y, Sun Y, Tan C, Zhang H, Li J, Chen W, Li R. MiR-152-5p as a microRNA passenger strand special functions in human gastric cancer cells. Int J Biol Sci 2018; 14(6):644-653. doi:10.7150/ijbs.25272. Available from

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Graphic abstract

Gastric cancer (GC) is one of the most common malignancies with high mortality rate. MiR-152 may exert the function of tumor suppressor by regulating its target gene, including PIK3CA. Nevertheless, all of the described functions are referred explicitly to miR-152-3p, while miR-152-5p as a passenger strand is poorly realized and entirely ignored. We previously selected miR-152-5p as a candidate using cell migration inhibition screening for GC cells and predicted that miR-152-5p might also target PIK3CA. In this study, we found an abnormal proportion of miR-152-3p / miR-152-5p in GC (gastric cancer) tissues and cells and demonstrated that miR-152-5p had poorer stability in GC cells, revealing the possibility that miR-152-5p is abnormally "suppressed" in gastric cancer. We also investigated and confirmed the role of miR-152-5p in GC by a series of experiments, and found that miR-152-5p modulated cell viability, migration, invasion, and cell-cycle progression of human GC cells, and also inhibited tumor growth and metastasis in vivo partially by targeting PIK3CA. More interestingly, it was proved that miR-152-3p and miR-152-5p had synergistic effects on the inhibition of PIK3CA in GC cells. The results of this study suggest that miR-152-5p may act as a tumor suppressor in SGC-7901 gastric cancer cells via targeting PIK3CA. Further, the study provides a novel insight into the roles of miRNA* during carcinogenesis.

Keywords: Gastric cancer, miR-152-5p, miR-152*, PIK3CA