Regulation of drug resistance and metastasis of gastric cancer cells via the microRNA647-ANK2 axis

Cao,Wenlong; Wei,Weiyuan; Zhan,Zexu; Xie,Dongyi; Xie,Yubo; Xiao,Qiang

doi:10.3892/ijmm.2018.3381

Regulation of drug resistance and metastasis of gastric cancer cells via the microRNA647-ANK2 axis

Authors:
- Wenlong Cao
- Weiyuan Wei
- Zexu Zhan
- Dongyi Xie
- Yubo Xie
- Qiang Xiao
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Affiliations: Department of Surgery, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi 530021, P.R. China, Department of Anaesthesiology, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi 530021, P.R. China
Published online on: January 11, 2018 https://doi.org/10.3892/ijmm.2018.3381
Pages: 1958-1966
Copyright: © Cao et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Due to a lack of effective methods for early diagnosis, the majority of patients with gastric cancer (GC) are diagnosed during the late stages of the disease, which are often accompanied by metastasis. For these patients, despite being considered an important therapeutic modality in the treatment of cancer, chemotherapy is usually not effective due to multidrug resistance (MDR). The expression levels of MDR/metastasis‑associated genes are regulated by numerous microRNAs (miRNAs/miRs). The expression of miR-647 in GC tissues and SGC7901/VCR cell line (drug resistance to vincristine) was detected by qRT-PCR. The effect of overexpression of miR-647 on drug resistance was evaluated by measuring the half maximal inhibitory concentration (IC50) value of SGC-7901/VCR to vincristine and tumor growth in vivo. Moreover, drug-induced cell apoptosis and cell cycle were evaluated by flow cytometry, as well as the ability of cell migration and invasiveness detected by wound healing and transwell assay. Furthermore, underlying targets of miR-647 were predicted by TargetScan and MicroRNA; meanwhile, the expression of ANK2, FAK, MMP2, MMP12,CD44,SNAIL1 were observed by qRT-PCR and western blot analysis. The present study established that the expression levels of miR‑647 were downregulated in GC tissues from patients with metastasis and in the vincristine‑resistant SGC7901 (SGC‑7901/VCR) GC cell line. The IC50 value for vincristine was significantly decreased, whereas the proportion of cells in G0/G1 phase and the drug‑induced apoptotic rate were significantly increased following upregulation of miR‑647. Furthermore, the results demonstrated that miR‑647 overexpression led to decreased migration and invasion of SGC‑7901/VCR cells. Overexpression of miR‑647 was also demonstrated to sensitize tumors to chemotherapy in vivo. In addition, miR‑647 overexpression was able to reduce the expression levels of ankyrin‑B, focal adhesion kinase, matrix metalloproteinase (MMP)2, MMP12, cluster of differentiation 44 and snail family transcriptional repressor 1. In conclusion, these findings demonstrated that miR‑647 may function as a novel target to ameliorate drug resistance and metastasis of GC cells.

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