KLF5‑mediated expression of CARD11 promotes the progression of gastric cancer

Li,Qiusen; Li,Sheng; Li,Zongxian; Xu,Hongyan; Zhang,Wenxian

doi:10.3892/etm.2023.12121

KLF5‑mediated expression of CARD11 promotes the progression of gastric cancer

Authors:
- Qiusen Li
- Sheng Li
- Zongxian Li
- Hongyan Xu
- Wenxian Zhang
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Affiliations: Department of Gastroenterology, The Second People's Hospital of Wuhu, Wuhu, Anhui 241000, P.R. China
Published online on: July 17, 2023 https://doi.org/10.3892/etm.2023.12121
Article Number: 422
Copyright: © Li et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Caspase recruitment domain‑containing protein 11 (CARD11) has been reported as functioning in multiple types of cancers. In the present study, the role and mechanism of CARD11 in gastric cancer was investigated. First, CARD11 expression in gastric cancer tissues and the association of CARD11 with overall survival were analyzed by the encyclopedia of RNA interactomes database. CARD11 expression in gastric cancer cells was detected by western blotting and reverse transcription‑quantitative PCR analyses. After CARD11 silencing, cell proliferation was evaluated by Cell Counting Kit‑8 assay, 5‑ethynyl‑2'‑deoxyuridine staining and flow cytometry analysis. Wound healing and Transwell assays were used to measure the capacities of cell migration and invasion. Additionally, the expression levels of epithelial‑mesenchymal transition (EMT)‑related proteins and mTOR‑related proteins were detected by western blot analysis. HumanTFDB predicted the binding of the transcription factor Krüppel‑like factor 5 (KLF5) to the CARD11 promoter, which was confirmed by dual luciferase reporter and chromatin immunoprecipitation assays. To explore the regulatory effects between KLF5 and CARD11, KLF5 was overexpressed to perform the rescue experiments in gastric cancer cells with CARD11 silencing. Results revealed that CARD11 was highly expressed in gastric cancer and was associated with poor prognosis. CARD11 interference inhibited the proliferation of gastric cancer cells and induced cell cycle arrest. Additionally, CARD11 silencing suppressed the migration, invasion and EMT of gastric cancer cells, accompanied by upregulated E‑cadherin expression and downregulated N‑cadherin and vimentin expression. Moreover, the transcription factor KLF5 positively regulated the transcription of CARD11 in gastric cancer. KLF5 overexpression reversed the effects of interference of CARD11 expression in gastric cancer cells to promote their proliferation, migration, invasion and EMT. KLF5 overexpression also led to a reduction in cell cycle arrest. Finally, interference of CARD11 expression suppressed the mTOR pathway, which was activated by KLF5. In conclusion, KLF5‑mediated CARD11 promoted the proliferation, migration and invasion of gastric cancer cells.

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