Open Access

Epigallocatechin‑3‑gallate inhibits self‑renewal ability of lung cancer stem‑like cells through inhibition of CLOCK

  • Authors:
    • Pan Jiang
    • Chuyue Xu
    • Pengpeng Zhang
    • Jianglei Ren
    • Fatima Mageed
    • Xiaoyue Wu
    • Lijun Chen
    • Falak Zeb
    • Qing Feng
    • Shanqun Li
  • View Affiliations

  • Published online on: October 14, 2020     https://doi.org/10.3892/ijmm.2020.4758
  • Pages: 2216-2224
  • Copyright: © Jiang et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Circadian rhythm plays an important role in diverse physiological processes. Abnormal expression of circadian rhythm genes is associated with increased risk of disease, including different types of cancer. The cancer stem cell (CSC) hypothesis suggests that there is a small subset of stem‑like cells within tumors that are responsible for tumor initiation. However, the biological effect of circadian rhythm on CSCs remains largely unknown. Studies have highlighted that the circadian rhythm protein CLOCK controls key aspects of various diseases. In the present study, lung cancer stem‑like cells were successfully enriched using a sphere formation assay. Next, it was observed that CLOCK mRNA and protein expression levels in the A549 and H1299 sphere cells were notably increased compared with those in the corresponding parental cells. In addition, flow cytometry was performed to isolate CD133+ cells and, consistently, CLOCK expression was also found to be markedly upregulated in CD133+ lung cancer cells. Subsequently, to determine the effect of CLOCK on lung cancer stem cells in detail, CLOCK was knocked down using targeted short inhibiting RNA and the results demonstrated that the sphere‑forming ability of the A549 and H1299 cell lines was reduced. In addition, CSC‑like properties, including the expression of CD133, CD44, sex determining region Y‑box 2, Nanog and octamer‑binding transcription factor 4, were markedly decreased in the A549 and H1299 sphere cells following knockdown of CLOCK. Epigallocatechin‑3‑gallate (EGCG), a green tea polyphenol, has been reported to be a potential anticancer phytochemical. EGCG was found to repress CLOCK expression in A549 and H1299 sphere cells. In addition, EGCG also decreased the ratio of CD133+ cells. The Wnt/β‑catenin pathway was notably inactivated by the knockdown of CLOCK in A549 and H1299 sphere cells. Subsequently, using a xenograft model, it was demonstrated that EGCG suppressed the CSC‑like characteristics of lung cancer cells by targeting CLOCK. In conclusion, the present study demonstrated that EGCG inhibited the self‑renewal ability of lung cancer stem‑like cells by targeting CLOCK.

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December-2020
Volume 46 Issue 6

Print ISSN: 1107-3756
Online ISSN:1791-244X

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Spandidos Publications style
Jiang P, Xu C, Zhang P, Ren J, Mageed F, Wu X, Chen L, Zeb F, Feng Q, Li S, Li S, et al: Epigallocatechin‑3‑gallate inhibits self‑renewal ability of lung cancer stem‑like cells through inhibition of CLOCK. Int J Mol Med 46: 2216-2224, 2020
APA
Jiang, P., Xu, C., Zhang, P., Ren, J., Mageed, F., Wu, X. ... Li, S. (2020). Epigallocatechin‑3‑gallate inhibits self‑renewal ability of lung cancer stem‑like cells through inhibition of CLOCK. International Journal of Molecular Medicine, 46, 2216-2224. https://doi.org/10.3892/ijmm.2020.4758
MLA
Jiang, P., Xu, C., Zhang, P., Ren, J., Mageed, F., Wu, X., Chen, L., Zeb, F., Feng, Q., Li, S."Epigallocatechin‑3‑gallate inhibits self‑renewal ability of lung cancer stem‑like cells through inhibition of CLOCK". International Journal of Molecular Medicine 46.6 (2020): 2216-2224.
Chicago
Jiang, P., Xu, C., Zhang, P., Ren, J., Mageed, F., Wu, X., Chen, L., Zeb, F., Feng, Q., Li, S."Epigallocatechin‑3‑gallate inhibits self‑renewal ability of lung cancer stem‑like cells through inhibition of CLOCK". International Journal of Molecular Medicine 46, no. 6 (2020): 2216-2224. https://doi.org/10.3892/ijmm.2020.4758