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MicroRNA-106a functions as an oncogene in human gastric cancer and contributes to proliferation and metastasis in vitro and in vivo

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Abstract

Mounting evidences has shown that miRNAs are involved in the development and progression of gastric cancer acts as tumor suppressor genes or oncogenes. In our previous studies, we have found that the up-regulation of miR-106a occurs frequently in human gastric cancer tissues compared with that of normal tissues. Here, we investigate the role of the ectopic expressed miR-106a in the progression and metastasis of gastric cancer in vitro and in vivo. FFPE samples have the priority to be included and qRT-PCR was used to detect the miR-106a expression. Human gastric cancer cells and immortalized gastric epithelial cell were selected and the miR-106a mimic and inhibitor were transfected. Cell growth was determined by MTT method. The flow cytometric analysis for cell apoptosis and transwell assays for evaluating the cell migration and invasion were conducted. Luciferase assay and western blot confirmed the direct binding site of miR-106a and its target. BALB/c nude mice were randomly divided to explore the implantation of gastric cancer cells transfected with miR-106a antagomir. Abnormal over-expression of miR-106a significantly promoted gastric cancer cell proliferation, metastasis, inhibited the cell apoptosis. Functional experiment ascertained that miR-106a interacted with FAS and mediated caspase3 pathway. Knockdown of miR-106a leaded to the attenuation of gastric cancer implantation capacity in vivo. Moreover, expression of TIMP2 was inversely associated with miR-106a in nodule tissues. Apoptotic body was also seen under electron microscope accompanied by silencing of miR-106a. Together, this data indicated that miR-106a may act as an oncogene and contribute to gastric cancer development.

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Acknowledgments

This work was supported by Grants from Ningxia Natural Science Foundation of China (No. NZ1230).

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Authors and Affiliations

  1. Department of Gastroenterology, General Hospital of Ningxia Medical University, 804 Shengli Street, Yinchuan, 750004, Ningxia, People’s Republic of China

    Meng Zhu

  2. Department of Pathology, General Hospital of Ningxia Medical University, Yinchuan, Ningxia, People’s Republic of China

    Ning Zhang

  3. Department of Gastroenterology, First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, People’s Republic of China

    Shuixiang He & Jun Zhang

  4. Department of Infectious Diseases, The Eighth Hospital of Xi’an, Xi’an, Shaanxi, People’s Republic of China

    Ruirui Yan

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  1. Meng Zhu
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Correspondence to Shuixiang He.

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Zhu, M., Zhang, N., He, S. et al. MicroRNA-106a functions as an oncogene in human gastric cancer and contributes to proliferation and metastasis in vitro and in vivo. Clin Exp Metastasis 33, 509–519 (2016). https://doi.org/10.1007/s10585-016-9795-9

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