Screening of differentially expressed miRNAs in tensile strain‑treated HepG2 cells by miRNA microarray analysis

Luo,Xu; Shen,Si; Yi,Suhong; Hu,Jiangfeng; Sun,Yunchen; Gao,Kewei; Zhu,Liang

doi:10.3892/mmr.2020.11057

Screening of differentially expressed miRNAs in tensile strain‑treated HepG2 cells by miRNA microarray analysis

Authors:
- Xu Luo
- Si Shen
- Suhong Yi
- Jiangfeng Hu
- Yunchen Sun
- Kewei Gao
- Liang Zhu
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Affiliations: Department of Gastroenterology, Changzheng Hospital, Second Military Medical University, Shanghai 200003, P.R. China, Department of Gastroenterology, Shanghai First People's Hospital, Shanghai 200003, P.R. China
Published online on: April 7, 2020 https://doi.org/10.3892/mmr.2020.11057
Pages: 2415-2426
Copyright: © Luo et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Cirrhosis and portal hypertension are associated with an increased risk of developing liver cancer. However, it is unknown how changes in the cellular mechanical microenvironment induced by portal hypertension affect the occurrence and development of liver cancer. The aim of this study was to determine the effect of tensile strain on the proliferation of a human liver cancer cell line (HepG2 cells) using methods such as flow cytometry, Cell Counting Kit‑8 and 5‑bromodeoxyuridine assays, and to examine the changes in microRNA (miRNA/miR) expression using microarray, reverse transcription‑quantitative (RT‑q)PCR and bioinformatics analyses. It was demonstrated that cyclic tensile force promoted the proliferation of HepG2 cells. The most suitable research conditions were as follows: Tensile strain force loading amplitude 15%; frequency 1 Hz; and time 24 h. After loading the HepG2 cells under such conditions, the differentially expressed miRNAs were screened out using an Agilent Human miRNA Microarray, identifying seven miRNAs with significant differences (expression difference >2 times and P<0.05). A total of five were upregulated, including hsa‑miR‑296‑5p, hsa‑miR‑6752‑5p, hsa‑miR‑6794‑5p, hsa‑miR‑6889‑5p and hsa‑miR‑7845‑5p; and two were downregulated, hsa‑miR‑4428 and hsa‑miR‑503‑5p. The results of RT‑qPCR also further confirmed the expression changes of these miRNAs. Gene Ontology and pathway analyses showed the involvement of these miRNAs in numerous important physiological processes. These findings may provide novel miRNA‑based information, thus enhancing the understanding of the pathophysiological processes leading to liver cancer.

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