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Overexpression of microRNA‑620 facilitates the resistance of triple negative breast cancer cells to gemcitabine treatment by targeting DCTD

  • Authors:
    • Chao Wu
    • Aili Zhao
    • Tingzhao Tan
    • Yuan Wang
    • Zhentao Shen
  • View Affiliations / Copyright

    Affiliations: Department of Medical Oncology, Liaocheng Cancer Prevention and Treatment Hospital, Liaocheng, Shandong 252000, P.R. China, Radiology Department, Liaocheng People's Hospital, Liaocheng, Shandong 252000, P.R. China
    Copyright: © Wu et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Pages: 550-558
    |
    Published online on: May 23, 2019
       https://doi.org/10.3892/etm.2019.7601
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Abstract

Patients with triple negative breast cancer (TNBC) have a poor survival rate following chemotherapy due to drug resistance. Notably, the molecular mechanism of drug resistance remains elusive. Between December 2011 and December 2014, 36 TNBC samples were obtained from Liaocheng People's Hospital. Three gemcitabine‑resistant MDA‑MB‑231 cell lines (MDA‑MB‑231rGEM1, MDA‑MB‑231rGEM2 and MDA‑MB‑231rGEM3) were obtained by exposure of MDA‑MB‑231 cells to increasing concentrations of gemcitabine for >12 months. Reverse transcription‑quantitative polymerase chain reaction was performed to detect the expression levels of specific genes, including microRNA (miR)‑620, ATP‑binding cassette sub‑family B member 1 (ABCB1), ABCC10, cytidine monophosphate kinase, deoxycytidine monophosphate deaminase (DCTD), nucleoside diphosphate kinase 1 (NME1), ribonucleoside‑diphosphate reductase large subunit (RRM1) and RRMB2. Western blot analysis was performed to assess the protein expression levels of DCTD. Furthermore, cell proliferation was assessed using a Cell Counting Kit‑8 assay and cell apoptosis was detected using an Annexin V/Dead Cell Apoptosis kit. Interactions between miR‑620 and DCTD were predicted using TargetScan and detected with the dual luciferase reporter assay. Elevation of miR‑620 expression levels were detected in two of the assessed gemcitabine‑resistant MDA‑MB‑231 cell lines compared with MDA‑MB‑231 cells. Gemcitabine induced significant elevation of miR‑620 in MDA‑MB‑231 cells. An increase of DCTD at mRNA and protein expression levels in MDA‑MB‑231rGEM1 cells was observed compared with those in MDA‑MB‑231 cells. Results suggested that DCTD was directly regulated by miR‑620. Inhibition of miR‑620 and overexpression of DCTD reversed gemcitabine resistance in MDA‑MB‑231rGEM1 cells via inducing cell apoptosis and cell growth arrest. A negative correlation was identified between miR‑620 and DCTD mRNA expression levels in patients with TNBC. The present results demonstrated that overexpression of miR‑620 could contribute to the development of gemcitabine resistance in patients with TNBC via the direct downregulation of DCTD.
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Copy and paste a formatted citation
Spandidos Publications style
Wu C, Zhao A, Tan T, Wang Y and Shen Z: Overexpression of microRNA‑620 facilitates the resistance of triple negative breast cancer cells to gemcitabine treatment by targeting DCTD. Exp Ther Med 18: 550-558, 2019.
APA
Wu, C., Zhao, A., Tan, T., Wang, Y., & Shen, Z. (2019). Overexpression of microRNA‑620 facilitates the resistance of triple negative breast cancer cells to gemcitabine treatment by targeting DCTD. Experimental and Therapeutic Medicine, 18, 550-558. https://doi.org/10.3892/etm.2019.7601
MLA
Wu, C., Zhao, A., Tan, T., Wang, Y., Shen, Z."Overexpression of microRNA‑620 facilitates the resistance of triple negative breast cancer cells to gemcitabine treatment by targeting DCTD". Experimental and Therapeutic Medicine 18.1 (2019): 550-558.
Chicago
Wu, C., Zhao, A., Tan, T., Wang, Y., Shen, Z."Overexpression of microRNA‑620 facilitates the resistance of triple negative breast cancer cells to gemcitabine treatment by targeting DCTD". Experimental and Therapeutic Medicine 18, no. 1 (2019): 550-558. https://doi.org/10.3892/etm.2019.7601
Copy and paste a formatted citation
x
Spandidos Publications style
Wu C, Zhao A, Tan T, Wang Y and Shen Z: Overexpression of microRNA‑620 facilitates the resistance of triple negative breast cancer cells to gemcitabine treatment by targeting DCTD. Exp Ther Med 18: 550-558, 2019.
APA
Wu, C., Zhao, A., Tan, T., Wang, Y., & Shen, Z. (2019). Overexpression of microRNA‑620 facilitates the resistance of triple negative breast cancer cells to gemcitabine treatment by targeting DCTD. Experimental and Therapeutic Medicine, 18, 550-558. https://doi.org/10.3892/etm.2019.7601
MLA
Wu, C., Zhao, A., Tan, T., Wang, Y., Shen, Z."Overexpression of microRNA‑620 facilitates the resistance of triple negative breast cancer cells to gemcitabine treatment by targeting DCTD". Experimental and Therapeutic Medicine 18.1 (2019): 550-558.
Chicago
Wu, C., Zhao, A., Tan, T., Wang, Y., Shen, Z."Overexpression of microRNA‑620 facilitates the resistance of triple negative breast cancer cells to gemcitabine treatment by targeting DCTD". Experimental and Therapeutic Medicine 18, no. 1 (2019): 550-558. https://doi.org/10.3892/etm.2019.7601
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