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Long noncoding RNA H19 contributes to gallbladder cancer cell proliferation by modulated miR-194-5p targeting AKT2

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Tumor Biology

Abstract

Gallbladder cancer (GBC) is a highly malignant cancer with poor prognosis. Although long noncoding RNA (lncRNA) H19 has been reported to play vital role in many human cancers, whether it is involved in GBC proliferation is still unknown. This study was designed to explore the effect of H19 in GBC cell proliferation. The expression of H19 and AKT2 were significantly elevated in GBC tissues, and the level of miR-194-5p is markedly decreased. Moreover, the RNA levels of H19 and AKT2 were positively correlated, and H19 elevation was significantly associated with tumor size. Cell proliferation decreased significantly after knockdown of H19 in GBC-SD and NOZ cells and after knockdown of AKT2 in NOZ cells. Results from cell cycle studies indicated that the S phase were significantly decreased after knockdown of H19 in NOZ cells but significantly elevated after overexpression of H19 in GBC-SD cells. Furthermore, knockdown of H19 upregulated miR-194-5p levels, yet significantly decreased miR-194-5p targeting AKT2 gene expression in NOZ cells. Inhibitor against miR-194-5p reversed these effects. In addition, overexpression of H19 in GBC-SD cells downregulated miR-194-5p and markedly increased AKT2 expression, and miR-194-5p mimic reversed these effects. Eventually, GBC cells were arrested in G0/G1-phase after H19 knockdown, inhibition of miR-194-5p markedly promoted cells into S-phase and co-transfection of siH19, and miR-194-5p inhibitor exerted mutually counter-regulated effects on cell cycle. These results suggested that H19/miR-194-5p/AKT2 axis regulatory network might modulate cell proliferation in GBC.

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Acknowledgments

We thank the Eastern Hepatobiliary Surgical Hospital and Institute, The Second Military University, Shanghai, for their help. This work was supported by the National Natural Science Foundation of China (Grant numbers 81272747and 81572297) and Doctorial innovation fund of Shanghai Jiao Tong University School of Medicine. We thank Dr. Qiu Lei, who helped us with language editing.

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    1. Department of General Surgery, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200000, China

      Shou-Hua Wang, Xiao-Cai Wu, Ming-Di Zhang, Ming-Zhe Weng, Di Zhou & Zhi-Wei Quan

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    Shou-Hua Wang and Xiao-Cai Wu contributed equally to this work.

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    Wang, SH., Wu, XC., Zhang, MD. et al. Long noncoding RNA H19 contributes to gallbladder cancer cell proliferation by modulated miR-194-5p targeting AKT2. Tumor Biol. 37, 9721–9730 (2016). https://doi.org/10.1007/s13277-016-4852-1

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