miR-204 regulates the biological behavior of breast cancer MCF-7 cells by directly targeting FOXA1

  • Authors:
    • Si-Qiao Shen
    • Lan-Shan Huang
    • Xiao-Ling Xiao
    • Xiao-Fei Zhu
    • Dan-Dan Xiong
    • Xue-Mei Cao
    • Kang-Lai Wei
    • Gang Chen
    • Zhen-Bo Feng
  • View Affiliations

  • Published online on: May 16, 2017     https://doi.org/10.3892/or.2017.5644
  • Pages: 368-376
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Abstract

MicroRNAs (miRNAs) are short, non-protein-coding RNAs and transcripts that are 18-24 nt in length. miR-204 was first identified as an anti-oncogene and is reported to be downregulated in non-small cell lung cancer, glioma, gastric and thyroid cancer. Recent studies have proposed that a low level of miR-204 expression is associated with tumor progression and disease outcome in breast cancer. Forkhead box A1 (FOXA1), a transcription factor, plays a crucial role in breast cancer and has been predicted as a target of miR-204. In the present study, we integrated the results of microarray analyses of breast cancer tissues obtained from an online database with our own determination of the expression of miR-204 in breast cancer MCF-7 cells using real-time qPCR (RT-qPCR). The proliferative capacity of the cells was assessed using MTT assays, and cell mobility and invasiveness were evaluated using cell migration and invasion assays, respectively. Flow cytometry was used to analyze apoptosis. FOXA1 levels were detected using RT-qPCR and western blot analysis. Luciferase assays were performed to confirm that FOXA1 is directly targeted by miR-204. The results showed that miR-204 was downregulated in breast cancer cells, and we found that miR-204 was expressed at a lower level in MCF-7 cells than that observed in normal breast epithelial HBL-100 cells. Overexpression of miR-204 inhibited cell proliferation, migration and invasion and promoted apoptosis. Western blot analysis revealed that the expression of FOXA1 at the protein level was significantly reduced after cells were transfected with miR-204-expressing viruses. Luciferase assays demonstrated that FOXA1 is a direct target of miR-204, which binds to FOXA1 in a complementary region. In conclusion, miR-204 regulates the biological behavior of breast cancer cells, including cell proliferation, invasion, metastasis and apoptosis, by directly targeting FOXA1. Thus, miR-204 may act as a tumor-suppressor, and the results of the present study provide a reference for future research into the potential mechanisms underlying breast cancer progression.
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July-2017
Volume 38 Issue 1

Print ISSN: 1021-335X
Online ISSN:1791-2431

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Spandidos Publications style
Shen S, Huang L, Xiao X, Zhu X, Xiong D, Cao X, Wei K, Chen G and Feng Z: miR-204 regulates the biological behavior of breast cancer MCF-7 cells by directly targeting FOXA1. Oncol Rep 38: 368-376, 2017
APA
Shen, S., Huang, L., Xiao, X., Zhu, X., Xiong, D., Cao, X. ... Feng, Z. (2017). miR-204 regulates the biological behavior of breast cancer MCF-7 cells by directly targeting FOXA1. Oncology Reports, 38, 368-376. https://doi.org/10.3892/or.2017.5644
MLA
Shen, S., Huang, L., Xiao, X., Zhu, X., Xiong, D., Cao, X., Wei, K., Chen, G., Feng, Z."miR-204 regulates the biological behavior of breast cancer MCF-7 cells by directly targeting FOXA1". Oncology Reports 38.1 (2017): 368-376.
Chicago
Shen, S., Huang, L., Xiao, X., Zhu, X., Xiong, D., Cao, X., Wei, K., Chen, G., Feng, Z."miR-204 regulates the biological behavior of breast cancer MCF-7 cells by directly targeting FOXA1". Oncology Reports 38, no. 1 (2017): 368-376. https://doi.org/10.3892/or.2017.5644