Wogonoside promotes apoptosis and ER stress in human gastric cancer cells by regulating the IRE1α pathway

Gu,Qian; Zhu,Canhong; Wu,Xi; Peng,Lianghuan; Huang,Genya; Hu,Rong

doi:10.3892/etm.2021.9842

Wogonoside promotes apoptosis and ER stress in human gastric cancer cells by regulating the IRE1α pathway

Authors:
- Qian Gu
- Canhong Zhu
- Xi Wu
- Lianghuan Peng
- Genya Huang
- Rong Hu
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Affiliations: Department of Geriatrics, First People's Hospital of Zhenjiang, The Affiliated People's Hospital of Jiangsu University, Zhenjiang, Jiangsu 212000, P.R. China
Published online on: February 25, 2021 https://doi.org/10.3892/etm.2021.9842
Article Number: 411
Copyright: © Gu et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Gastric cancer is a disease that occurs in the digestive system of humans and remains a problem in the medical field. Wogonoside, a natural flavonoid, has been reported to exert antitumor effects on various types of tumors. However, the effects of wogonoside on gastric cancer remain elusive. The aim of the present study was to detect whether wogonoside treatment could induce apoptosis and ER stress in gastric cancer cells. In the present study, CCK‑8 assay was used to detect the cell viability, Annexin V/PI staining was used to detect the cells apoptosis, western blot analysis and real‑time PCR analysis was used to detect the endoplasmic reticulum (ER) stress in the AGS and MKN‑45 gastric cancer cell lines. Wogonoside treatment reduced the viability of AGS and MKN‑45 cells and induced apoptosis. Furthermore, the expression level of caspase‑3 and ‑9 significantly increased following wogonoside treatment compared with that in non‑treated cells, and the protein expression levels of proapoptotic Bax and antiapoptotic Bcl‑2 increased and decreased, respectively compared with that in the control group. In addition, the phosphorylated protein expression levels of mitogen‑activated protein kinase kinase 5 (ASK1) and JNK increased following wogonoside treatment, and the protein expression levels of tumor necrosis factor receptor‑associated factor 2 (TRAF2) and serine/threonine‑protein kinase/endoribonuclease IRE1 (IRE1α) were also increased following treatment with 50 µM wogonoside for 48 h. Furthermore, the interactions between IRE1α, TRAF2 and ASK1 significantly increased following wogonoside treatment, suggesting that wogonoside induced endoplasmic reticulum (ER) stress in the AGS and MKN‑45 cell lines. In addition, small interfering RNA‑mediated silencing of IRE1α suppressed the activity of the IRE1α‑TRAF2‑ASK1 complex and prevented wogonoside‑induced cell apoptosis. In conclusion, the results of the present study suggested that wogonoside exhibited antitumor activity by inducing ER stress‑associated cell death through the IRE1α‑TRAF2‑ASK1 pathway.

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