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Article Open Access

IL‑21/IL‑21R inhibit tumor growth and invasion in non‑small cell lung cancer cells via suppressing Wnt/β‑catenin signaling and PD‑L1 expression

  • Authors:
    • Dan Xue
    • Ping Yang
    • Qiongying Wei
    • Xiaoping Li
    • Lan Lin
    • Tingyan Lin
  • View Affiliations / Copyright

    Affiliations: Department of Respiratory Medicine, Fujian Medical University Union Hospital, Fuzhou, Fujian 350001, P.R. China, Department of Respiratory Medicine, People's Hospital Affiliated to Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian 350001, P.R. China
    Copyright: © Xue et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Pages: 1697-1706
    |
    Published online on: September 26, 2019
       https://doi.org/10.3892/ijmm.2019.4354
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Abstract

Lung cancer is considered to be one of the world's deadliest diseases, with non‑small cell lung cancer (NSCLC) accounting for 85% of all lung cancer cases. The present study aimed to investigate the role and underlying mechanisms of interleukin‑21 (IL‑21), and its receptor IL‑21R, in NSCLC. Lung tissues and blood samples of NSCLC were used to measure IL‑21, IL‑21R and programmed death 1 ligand 1 (PD‑L1) expression using ELISA, western blot and immunohistochemistry analyses. Following treatment with different doses of IL‑21, the proliferation, invasion and migration of human NSCLC cell line A549 was evaluated using a cell counting kit‑8, colony formation, Transwell and scratch wound healing assays, respectively. Additionally, IL‑21R and PD‑L1 expression in A549 cells was detected using western blot analysis and immunofluorescence. IL‑21R silencing was subsequently used to investigate its effects in cell proliferation, invasion and migration. PD‑L1, IL‑1β and tumor necrosis factor α (TNF‑α) expression were measured. Finally, Wnt/β‑catenin signaling expression was evaluated using western blot analysis following treatment with IL‑21. Cells were then treated with lithium chloride (LiCl), which is an agonist of Wnt/β‑catenin signaling, and the levels of PD‑L1, IL‑1β and TNF‑α were detected. The results revealed that IL‑21 and IL‑21R expression in the lung tissues and blood samples of patients with NSCLC were decreased, while PD‑L1 expression was increased, compared with normal tissues or healthy controls. Treatment of A549 cells with IL‑21 upregulated IL‑21R expression, downregulated PD‑L1 and inhibited cell growth and metastasis in a dose‑dependent manner. Following IL‑21R silencing, the effects of IL‑21 treatment were reversed, suggesting that IL‑21 acted on A549 cells through binding to IL‑21R. In addition, the results demonstrated that IL‑21 treatment reduced the expression levels of proteins associated with the Wnt/β‑catenin signaling, whereas activation of Wnt/β‑catenin signaling with the LiCl agonist upregulated PD‑L1, IL‑1β and TNF‑α expression. In conclusion, the IL‑21/IL‑21R axis reduced the growth and invasion of NSCLC cells via inhibiting Wnt/β‑catenin signaling and PD‑L1 expression. The present results may provide a novel molecular target for NSCLC diagnosis and therapy.
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Copy and paste a formatted citation
Spandidos Publications style
Xue D, Yang P, Wei Q, Li X, Lin L and Lin T: IL‑21/IL‑21R inhibit tumor growth and invasion in non‑small cell lung cancer cells via suppressing Wnt/β‑catenin signaling and PD‑L1 expression. Int J Mol Med 44: 1697-1706, 2019.
APA
Xue, D., Yang, P., Wei, Q., Li, X., Lin, L., & Lin, T. (2019). IL‑21/IL‑21R inhibit tumor growth and invasion in non‑small cell lung cancer cells via suppressing Wnt/β‑catenin signaling and PD‑L1 expression. International Journal of Molecular Medicine, 44, 1697-1706. https://doi.org/10.3892/ijmm.2019.4354
MLA
Xue, D., Yang, P., Wei, Q., Li, X., Lin, L., Lin, T."IL‑21/IL‑21R inhibit tumor growth and invasion in non‑small cell lung cancer cells via suppressing Wnt/β‑catenin signaling and PD‑L1 expression". International Journal of Molecular Medicine 44.5 (2019): 1697-1706.
Chicago
Xue, D., Yang, P., Wei, Q., Li, X., Lin, L., Lin, T."IL‑21/IL‑21R inhibit tumor growth and invasion in non‑small cell lung cancer cells via suppressing Wnt/β‑catenin signaling and PD‑L1 expression". International Journal of Molecular Medicine 44, no. 5 (2019): 1697-1706. https://doi.org/10.3892/ijmm.2019.4354
Copy and paste a formatted citation
x
Spandidos Publications style
Xue D, Yang P, Wei Q, Li X, Lin L and Lin T: IL‑21/IL‑21R inhibit tumor growth and invasion in non‑small cell lung cancer cells via suppressing Wnt/β‑catenin signaling and PD‑L1 expression. Int J Mol Med 44: 1697-1706, 2019.
APA
Xue, D., Yang, P., Wei, Q., Li, X., Lin, L., & Lin, T. (2019). IL‑21/IL‑21R inhibit tumor growth and invasion in non‑small cell lung cancer cells via suppressing Wnt/β‑catenin signaling and PD‑L1 expression. International Journal of Molecular Medicine, 44, 1697-1706. https://doi.org/10.3892/ijmm.2019.4354
MLA
Xue, D., Yang, P., Wei, Q., Li, X., Lin, L., Lin, T."IL‑21/IL‑21R inhibit tumor growth and invasion in non‑small cell lung cancer cells via suppressing Wnt/β‑catenin signaling and PD‑L1 expression". International Journal of Molecular Medicine 44.5 (2019): 1697-1706.
Chicago
Xue, D., Yang, P., Wei, Q., Li, X., Lin, L., Lin, T."IL‑21/IL‑21R inhibit tumor growth and invasion in non‑small cell lung cancer cells via suppressing Wnt/β‑catenin signaling and PD‑L1 expression". International Journal of Molecular Medicine 44, no. 5 (2019): 1697-1706. https://doi.org/10.3892/ijmm.2019.4354
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