miR-138 suppresses the proliferation, metastasis and autophagy of non-small cell lung cancer by targeting Sirt1

Ye,Zaiting; Fang,Bingmu; Pan,Jiongwei; Zhang,Ning; Huang,Jinwei; Xie,Congying; Lou,Tianzheng; Cao,Zhuo

doi:10.3892/or.2017.5619

miR-138 suppresses the proliferation, metastasis and autophagy of non-small cell lung cancer by targeting Sirt1

Authors:
- Zaiting Ye
- Bingmu Fang
- Jiongwei Pan
- Ning Zhang
- Jinwei Huang
- Congying Xie
- Tianzheng Lou
- Zhuo Cao
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Affiliations: The Sixth Affiliated Hospital of Wenzhou Medical University/Lishui People's Hospitlal, Lishui, Zhejiang 323000, P.R. China, The Central Hospital of Lishui City, Lishui, Zhejiang 323000, P.R. China, The First Affiliated Hospital of Wenzhou Medical University, Lishui, Zhejiang 323000, P.R. China
Published online on: May 3, 2017 https://doi.org/10.3892/or.2017.5619
Pages: 3244-3252
Copyright: © Ye et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

The present study determined the role and mechanism of miR-138 in non-small cell lung cancer (NSCLC). In total, 45 freshly resected clinical NSCLC tissues were collected. The expression of miR-138 in tissues and cell lines were determined by real-time quantitative PCR. miR-138 mimics were transfected into A549 and Calu-3 cells in vitro, and then the effects of miR-138 on lung cancer cell proliferation, cell cycle, invasion and metastasis were investigated by CCK-8 assay, Transwell and flow cytometry, respectively. The protein expression of the potential target gene Sirt1 in lung cancer cells were determined by western blot analysis. Dual-luciferase reporter assay was performed to further confirm whether Sirt1 was the target gene of miR-138. The expression of miR-138 was significantly lower in lung cancer tissues and was negatively correlated to the differentiation degree and lymph node metastasis of lung cancer. In vitro experiment results showed that miR-138 inhibited lung cancer cell proliferation, invasion and migration. It was verified that miR-138 could downregulate Sirt1 protein expression, inhibit epithelial-mesenchymal transition (EMT), decrease the activity of AMPK signaling pathway and elevate mTOR phosphorylation level. Dual-luciferase reporter assay demonstrated that miR-138 could directly regulate Sirt1. Downregulation of Sirt1 alone can also cause the same molecular and biological function changes. Western blot analysis and confocal microscopy results indicated that overexpression of miR-138 or interference of Sirt1 expression could inhibit lung cancer cell autophagy activity possibly through AMPK-mTOR signaling pathway. miR-138 plays a tumor suppressor function in lung cancer. It may inhibit the proliferation, invasion and migration of lung cancer through downregulation of Sirt1 expression and activation of cell autophagy. The downregulation of miR-138 is closely related to the development of lung cancer.

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