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p21 promotes gemcitabine tolerance in A549 cells by inhibiting DNA damage and altering the cell cycle

  • Authors:
    • Tian Fu
    • Xuan Ma
    • Shen-Lin Du
    • Zhi-Yin Ke
    • Xue-Chun Wang
    • Hai-Han Yin
    • Wen-Xuan Wang
    • Yong-Jun Liu
    • Ai-Ling Liang
  • View Affiliations / Copyright

    Affiliations: Department of Biochemistry and Molecular Biology, Guangdong Provincial Key Laboratory of Medical Molecular Diagnostics, Guangdong Medical University, Dongguan, Guangdong 523808, P.R. China, Department of Clinical Laboratory, Xinle City Hospital, Shijiazhuang, Hebei 050700, P.R. China, Department of Clinical Laboratory, Dongguan People's Hospital, Dongguan, Guangdong 523058, P.R. China
    Copyright: © Fu et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Article Number: 471
    |
    Published online on: September 20, 2023
       https://doi.org/10.3892/ol.2023.14059
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Abstract

Gemcitabine is one of the most widely used chemotherapy drugs for advanced malignant tumors, including non‑small cell lung cancer. However, the clinical efficacy of gemcitabine is limited due to drug resistance. The aim of the present study was to investigate the role of p21 in gemcitabine‑resistant A549 (A549/G+) lung cancer cells. IC50 values were determined using a Cell Counting Kit‑8 (CCK‑8) assay. mRNA and protein expression levels of genes were measured by reverse transcription‑quantitative PCR and western blotting, respectively. The cell cycle distribution and apoptosis rate were analyzed by flow cytometry. DNA damage in cells was evaluated by single‑cell gel electrophoresis. The results of western blot analysis and the CCK‑8 assay demonstrated that the expression of p21 was higher in A549/G+ cells than in gemcitabine‑sensitive cells. Knockdown of p21 expression in gemcitabine‑resistant cells sensitized these cells to gemcitabine (with the IC50 decreasing from 84.2 to 26.7 µM). Cell cycle analysis revealed different changes in the cell cycle distribution in A549/G+ cells treated with the same concentration of gemcitabine, and decreased expression of p21 was shown to promote G1 arrest. The apoptosis assay and comet assay results revealed that decreased p21 expression resulted in accumulation of unrepaired DNA double‑strand breaks (DSBs) and induction of apoptosis by gemcitabine. The present study demonstrated that knockout of p21 mRNA expression in A549/G+ cells promotes apoptosis and DNA DSB accumulation, accompanied by G1 arrest. These results indicated that p21 is involved in regulating the response of A549 cells to gemcitabine.
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Copy and paste a formatted citation
Spandidos Publications style
Fu T, Ma X, Du S, Ke Z, Wang X, Yin H, Wang W, Liu Y and Liang A: p21 promotes gemcitabine tolerance in A549 cells by inhibiting DNA damage and altering the cell cycle. Oncol Lett 26: 471, 2023.
APA
Fu, T., Ma, X., Du, S., Ke, Z., Wang, X., Yin, H. ... Liang, A. (2023). p21 promotes gemcitabine tolerance in A549 cells by inhibiting DNA damage and altering the cell cycle. Oncology Letters, 26, 471. https://doi.org/10.3892/ol.2023.14059
MLA
Fu, T., Ma, X., Du, S., Ke, Z., Wang, X., Yin, H., Wang, W., Liu, Y., Liang, A."p21 promotes gemcitabine tolerance in A549 cells by inhibiting DNA damage and altering the cell cycle". Oncology Letters 26.5 (2023): 471.
Chicago
Fu, T., Ma, X., Du, S., Ke, Z., Wang, X., Yin, H., Wang, W., Liu, Y., Liang, A."p21 promotes gemcitabine tolerance in A549 cells by inhibiting DNA damage and altering the cell cycle". Oncology Letters 26, no. 5 (2023): 471. https://doi.org/10.3892/ol.2023.14059
Copy and paste a formatted citation
x
Spandidos Publications style
Fu T, Ma X, Du S, Ke Z, Wang X, Yin H, Wang W, Liu Y and Liang A: p21 promotes gemcitabine tolerance in A549 cells by inhibiting DNA damage and altering the cell cycle. Oncol Lett 26: 471, 2023.
APA
Fu, T., Ma, X., Du, S., Ke, Z., Wang, X., Yin, H. ... Liang, A. (2023). p21 promotes gemcitabine tolerance in A549 cells by inhibiting DNA damage and altering the cell cycle. Oncology Letters, 26, 471. https://doi.org/10.3892/ol.2023.14059
MLA
Fu, T., Ma, X., Du, S., Ke, Z., Wang, X., Yin, H., Wang, W., Liu, Y., Liang, A."p21 promotes gemcitabine tolerance in A549 cells by inhibiting DNA damage and altering the cell cycle". Oncology Letters 26.5 (2023): 471.
Chicago
Fu, T., Ma, X., Du, S., Ke, Z., Wang, X., Yin, H., Wang, W., Liu, Y., Liang, A."p21 promotes gemcitabine tolerance in A549 cells by inhibiting DNA damage and altering the cell cycle". Oncology Letters 26, no. 5 (2023): 471. https://doi.org/10.3892/ol.2023.14059
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