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Article

Co‑inhibition of miRNA‑21 and miRNA‑221 induces apoptosis by enhancing the p53‑mediated expression of pro‑apoptotic miRNAs in laryngeal squamous cell carcinoma

  • Authors:
    • Xuan Kan
    • Yanan Sun
    • Jianguang Lu
    • Minghua Li
    • Yu Wang
    • Qiuying Li
    • Ying Liu
    • Ming Liu
    • Linli Tian
  • View Affiliations / Copyright

    Affiliations: Department of Otolaryngology, Head and Neck Surgery, The Second Affiliated Hospital, Harbin Medical University, Harbin, Heilongjiang 150081, P.R. China
  • Pages: 4315-4320
    |
    Published online on: March 28, 2016
       https://doi.org/10.3892/mmr.2016.5048
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Abstract

Dysregulation of a numerous microRNAs (miRNAs) has been implicated in laryngeal squamous cell carcinoma (LSCC). Among those miRNAs, miR‑21 and miR‑221 are co‑overexpressed and commonly target the phosphatase and tensin homolog protein (PTEN) that is located in the PTEN‑Akt signaling pathway. The present study investigated whether co‑inhibition of miR‑21 and miR‑221 induced synergistic apoptosis of human LSCC cells. Methyl thiazolyl tetrazolium (MTT) and terminal deoxynucleotidyl‑transferase‑mediated deoxynucleotide triphosphate nick end labeling (TUNEL) assays were used to observe the potential effect of miR‑21 and miR‑221 on cell viability and apoptosis in cells co‑transfected with anti‑miRNA oligonucleotide (AMO)‑21 and AMO‑221. The protein expression levels of PTEN, Akt and p53 were determined by western blotting. The cellular abundance of 6 pro‑apoptotic miRNAs transcribed by p53 mediation, consisting of miR‑15a, miR‑16‑1, miR‑26a, miR‑34a, miR‑143 and miR‑203, was measured with using reverse transcription‑quantitative polymerase chain reaction (RT‑qPCR). MTT results indicate that in vitro co‑transfection of AMO‑21 and AMO‑221 leads to a decline in cell viability, compared with the transfection of AMO alone. This result was verified by the detection of apoptosis using TUNEL assays. Co‑transfection of AMO‑21 and AMO‑221 resulted in a marked reduction in Akt phosphorylation and enhanced expression of PTEN and p53 were observed; consequently, leading to an amplification of the transcription of 6 pro‑apoptotic miRNAs. The present findings confirmed that co‑inhibition of miR‑21 and miR‑221 synergistically triggers cell apoptosis in vitro. The altered PTEN‑Akt signaling and p53‑mediated amplification of the transcription of pro‑apoptotic miRNAs may be involved in the observed synergistic effect. The present study provides novel insights into the mechanism underlying apoptosis‑associated miRNA‑miRNA mutual regulation in LSCC.
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Copy and paste a formatted citation
Spandidos Publications style
Kan X, Sun Y, Lu J, Li M, Wang Y, Li Q, Liu Y, Liu M and Tian L: Co‑inhibition of miRNA‑21 and miRNA‑221 induces apoptosis by enhancing the p53‑mediated expression of pro‑apoptotic miRNAs in laryngeal squamous cell carcinoma. Mol Med Rep 13: 4315-4320, 2016.
APA
Kan, X., Sun, Y., Lu, J., Li, M., Wang, Y., Li, Q. ... Tian, L. (2016). Co‑inhibition of miRNA‑21 and miRNA‑221 induces apoptosis by enhancing the p53‑mediated expression of pro‑apoptotic miRNAs in laryngeal squamous cell carcinoma. Molecular Medicine Reports, 13, 4315-4320. https://doi.org/10.3892/mmr.2016.5048
MLA
Kan, X., Sun, Y., Lu, J., Li, M., Wang, Y., Li, Q., Liu, Y., Liu, M., Tian, L."Co‑inhibition of miRNA‑21 and miRNA‑221 induces apoptosis by enhancing the p53‑mediated expression of pro‑apoptotic miRNAs in laryngeal squamous cell carcinoma". Molecular Medicine Reports 13.5 (2016): 4315-4320.
Chicago
Kan, X., Sun, Y., Lu, J., Li, M., Wang, Y., Li, Q., Liu, Y., Liu, M., Tian, L."Co‑inhibition of miRNA‑21 and miRNA‑221 induces apoptosis by enhancing the p53‑mediated expression of pro‑apoptotic miRNAs in laryngeal squamous cell carcinoma". Molecular Medicine Reports 13, no. 5 (2016): 4315-4320. https://doi.org/10.3892/mmr.2016.5048
Copy and paste a formatted citation
x
Spandidos Publications style
Kan X, Sun Y, Lu J, Li M, Wang Y, Li Q, Liu Y, Liu M and Tian L: Co‑inhibition of miRNA‑21 and miRNA‑221 induces apoptosis by enhancing the p53‑mediated expression of pro‑apoptotic miRNAs in laryngeal squamous cell carcinoma. Mol Med Rep 13: 4315-4320, 2016.
APA
Kan, X., Sun, Y., Lu, J., Li, M., Wang, Y., Li, Q. ... Tian, L. (2016). Co‑inhibition of miRNA‑21 and miRNA‑221 induces apoptosis by enhancing the p53‑mediated expression of pro‑apoptotic miRNAs in laryngeal squamous cell carcinoma. Molecular Medicine Reports, 13, 4315-4320. https://doi.org/10.3892/mmr.2016.5048
MLA
Kan, X., Sun, Y., Lu, J., Li, M., Wang, Y., Li, Q., Liu, Y., Liu, M., Tian, L."Co‑inhibition of miRNA‑21 and miRNA‑221 induces apoptosis by enhancing the p53‑mediated expression of pro‑apoptotic miRNAs in laryngeal squamous cell carcinoma". Molecular Medicine Reports 13.5 (2016): 4315-4320.
Chicago
Kan, X., Sun, Y., Lu, J., Li, M., Wang, Y., Li, Q., Liu, Y., Liu, M., Tian, L."Co‑inhibition of miRNA‑21 and miRNA‑221 induces apoptosis by enhancing the p53‑mediated expression of pro‑apoptotic miRNAs in laryngeal squamous cell carcinoma". Molecular Medicine Reports 13, no. 5 (2016): 4315-4320. https://doi.org/10.3892/mmr.2016.5048
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