MicroRNA‑373‑3p inhibits the proliferation and invasion of non‑small‑cell lung cancer cells by targeting the GAB2/PI3K/AKT pathway

Zhu,Xunxia; Chen,Xiaoyu; Zhang,Xuelin; Zhao,Liting; Shen,Xiaoyong

doi:10.3892/ol.2024.14353

MicroRNA‑373‑3p inhibits the proliferation and invasion of non‑small‑cell lung cancer cells by targeting the GAB2/PI3K/AKT pathway

Authors:
- Xunxia Zhu
- Xiaoyu Chen
- Xuelin Zhang
- Liting Zhao
- Xiaoyong Shen
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Affiliations: Department of Thoracic Surgery, Huadong Hospital, Shanghai 200040, P.R. China, Department of Thoracic Surgery, Huadong Hospital, Shanghai 200040, P.R. China
Published online on: March 22, 2024 https://doi.org/10.3892/ol.2024.14353
Article Number: 221
Copyright: © Zhu et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

MicroRNAs (miRNAs) were previously demonstrated to be involved in the pathogenesis of non‑small‑cell lung cancer (NSCLC); however, the roles of certain miRNAs in NSCLC remain to be elucidated. The present study aimed to investigate the functions of screened miRNAs in NSCLC and the potential mechanisms. First, expression profiles of miRNAs were downloaded from the Gene Expression Omnibus (dataset no. GSE29248) and the differentially expressed miRNAs were analyzed by bioinformatics methods. Reverse transcription‑quantitative PCR was used to validate the differential expression of miR‑373 in clinical samples. The association between miR‑373 expression levels and clinicopathological characteristics was also investigated. To further examine how miR‑373 mediates the emergence of NSCLC, western blot, Cell Counting Kit‑8, cell invasion and wound‑healing assays, as well as apoptosis detection and a luciferase assay were used. The results indicated significant downregulation of miR‑373 in NSCLC tissues and its low expression was closely associated with the degree of differentiation, clinical stage and tumor size, and was indicative of an unfavorable prognosis for patients with NSCLC. A functional study indicated that overexpression of miR‑373 inhibited the proliferation, promoted apoptosis, and suppressed invasion and migration of NSCLC cells. Bioinformatics prediction and functional assays suggested that Grb‑associated binding protein 2 (GAB2) was a direct target of miR‑373. In addition, GAB2 was found to be significantly upregulated in NSCLC tissues, and clinically, miR‑373 was negatively associated with GAB2. Furthermore, overexpression of GAB2 blocked the tumor suppressive effects of miR‑373 on NSCLC cells. Mechanistically, miR‑373 mimics were able to reduce the expression of GAB2 and subsequently decrease the phosphorylation level of AKT and mTOR protein. The present results indicate that miR‑373 exerts its anti‑tumor effects in NSCLC cells by targeting the GAB2/PI3K/AKT pathway, suggesting that miR‑373 may be a potential therapeutic target in NSCLC.

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