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Article

Downregulation of microRNA-17-5p inhibits drug resistance of gastric cancer cells partially through targeting p21

  • Authors:
    • Ziwei Wang
    • Feng Ji
  • View Affiliations / Copyright

    Affiliations: Department of Internal Medicine, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310003, P.R. China, Department of Digestive Diseases, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310003, P.R. China
  • Pages: 4585-4591
    |
    Published online on: January 19, 2018
       https://doi.org/10.3892/ol.2018.7822
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Abstract

MicroRNAs (miRNAs/miRs) are endogenous small non‑coding RNAs that post‑transcriptionally regulate the expression of genes and serve crucial roles in diverse biological processes. The present study aimed to examine the miRNA expression profile and drug resistance in the SGC7901 cell line and its isogenic drug‑resistant counterpart, SGC7901/cisplatin (DDP) cell line. The potential role of miR‑17‑5p in modulating drug resistance in gastric cancer cells was investigated. Different levels of miRNA expression between SGC7901/DDP and SGC7901 cells were analyzed by miRNA microarray and validated by quantitative polymerase chain reaction. It was indicated that the downregulation of miR‑17‑5p sensitized SGC7901/DDP cells to anticancer drugs. A decreased luciferase activity of p21 3'‑untranslated region‑based reporter in miR‑17‑5p‑transfected SGC7901/DDP cells suggested that p21 may be a direct target gene of miR‑17‑5p. Western blot analysis and flow cytometric assay revealed that the downregulation of miR‑17‑5p increases the sensitivity of SGC7901/DDP cells to DDP‑induced apoptosis. Taken together, these results demonstrated that miR‑17‑5p may perform a role in the development of drug resistance in gastric cancer cells, at least partially by modulating apoptosis via targeting p21.
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Copy and paste a formatted citation
Spandidos Publications style
Wang Z and Ji F: Downregulation of microRNA-17-5p inhibits drug resistance of gastric cancer cells partially through targeting p21. Oncol Lett 15: 4585-4591, 2018.
APA
Wang, Z., & Ji, F. (2018). Downregulation of microRNA-17-5p inhibits drug resistance of gastric cancer cells partially through targeting p21. Oncology Letters, 15, 4585-4591. https://doi.org/10.3892/ol.2018.7822
MLA
Wang, Z., Ji, F."Downregulation of microRNA-17-5p inhibits drug resistance of gastric cancer cells partially through targeting p21". Oncology Letters 15.4 (2018): 4585-4591.
Chicago
Wang, Z., Ji, F."Downregulation of microRNA-17-5p inhibits drug resistance of gastric cancer cells partially through targeting p21". Oncology Letters 15, no. 4 (2018): 4585-4591. https://doi.org/10.3892/ol.2018.7822
Copy and paste a formatted citation
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Spandidos Publications style
Wang Z and Ji F: Downregulation of microRNA-17-5p inhibits drug resistance of gastric cancer cells partially through targeting p21. Oncol Lett 15: 4585-4591, 2018.
APA
Wang, Z., & Ji, F. (2018). Downregulation of microRNA-17-5p inhibits drug resistance of gastric cancer cells partially through targeting p21. Oncology Letters, 15, 4585-4591. https://doi.org/10.3892/ol.2018.7822
MLA
Wang, Z., Ji, F."Downregulation of microRNA-17-5p inhibits drug resistance of gastric cancer cells partially through targeting p21". Oncology Letters 15.4 (2018): 4585-4591.
Chicago
Wang, Z., Ji, F."Downregulation of microRNA-17-5p inhibits drug resistance of gastric cancer cells partially through targeting p21". Oncology Letters 15, no. 4 (2018): 4585-4591. https://doi.org/10.3892/ol.2018.7822
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