MicroRNA‑455 is downregulated in gastric cancer and inhibits cell proliferation, migration and invasion via targeting insulin‑like growth factor 1 receptor

Zhang,Shan; Yin,Wan‑Ling; Zhang,Xin; Zhang,Xiao‑Yu

doi:10.3892/mmr.2017.6979

MicroRNA‑455 is downregulated in gastric cancer and inhibits cell proliferation, migration and invasion via targeting insulin‑like growth factor 1 receptor

Authors:
- Shan Zhang
- Wan‑Ling Yin
- Xin Zhang
- Xiao‑Yu Zhang
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Affiliations: Department of Geriatrics, The Fifth People's Hospital of Shanghai, Fudan University, Shanghai 200240, P.R. China, Department of Integrated Medicine (Houhu), The Central Hospital of Wuhan, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430014, P.R. China, Department of Radiology, The Fourth People's Hospital of Huai'an, Huai'an, Jiangsu 223300, P.R. China, Division of Gastrointestinal Surgery, Department of General Surgery, The Affiliated Huai'an Hospital of Xuzhou Medical University and The Second People's Hospital of Huai'an, Huai'an, Jiangsu 223002, P.R. China
Published online on: July 14, 2017 https://doi.org/10.3892/mmr.2017.6979
Pages: 3664-3672

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Abstract

Gastric cancer is the fourth most common and the second leading cause of cancer mortality worldwide. The dysregulation of microRNAs has been demonstrated to be significant in gastric cancer carcinogenesis and progression due to changes in expression of their target genes. In the current study, microRNA‑455 (miR‑455) was identified to be significantly downregulated in gastric cancer tissue samples and cell lines. A low expression level of miR‑455 was correlated with the clinical stage, lymph node metastasis and tumor invasion in gastric cancer. Restoration of miR‑455 expression inhibited cell proliferation, migration and invasion of gastric cancer cells in vitro. Bioinformatic analysis and luciferase reporter assay revealed that miR‑455 directly targeted the 3'‑untranslated region of insulin‑like growth factor 1 receptor (IGF‑1R). In addition, the IGF‑1R mRNA expression level was increased in gastric cancer tissue samples and was inversely correlated with miR‑455 expression levels. Restoration of miR‑455 downregulated IGF‑1R mRNA and protein expression levels in gastric cancer cells. Furthermore, silencing of IGF‑1R significantly inhibited gastric cancer cell proliferation, migration and invasion, which was similar to the functions induced by miR‑455 overexpression. Thus, these results indicate that miR‑455 is involved in gastric cancer progression by directly targeting IGF‑1R and may serve as a novel therapeutic target for the treatment of gastric cancer.

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