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MicroRNA-205 suppresses proliferation and promotes apoptosis in laryngeal squamous cell carcinoma

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Abstract

MicroRNAs were reported to be involved in the modulation of tumor development. The aim of our study was to investigate the effect of miR-205 on proliferation and apoptosis of laryngeal squamous cell carcinoma (LSCC) and seek associations between miR-205 and Bcl-2 using in vitro and in vivo methods. Real-time qPCR was used to analyze the expression of miR-205 in LSCC samples and Hep-2 cell line. Apoptosis, cell cycle, and proliferation (MTT) assays were performed to test the apoptosis and proliferation of LSCC cells after miR-205 transfection. Bcl-2 expression in cells was assessed with Western blotting. The tumorigenicity of LSCC cells was evaluated in nude mice model. MiR-205 was significantly down-regulated in LSCC tissues compared to adjacent normal tissues. Lower expression of miR-205 was indicated to be statistically related with advanced clinical stage and T3–4 grades. We found that restoration of miR-205 down-regulated the proliferative markers of dihydrofolate reductase and proliferating cell nuclear antigen and apoptotic regulator of Bcl-2. The findings in vitro and in vivo showed miR-205 could suppress cell proliferation and induce cell apoptosis. In addition, Bcl-2 was identified as one of the direct targets of miR-205 in LSCC cells. These results suggest that miR-205 may play as a tumor suppressor in LSCC, probably by targeting Bcl-2 and serve as a potential target for therapeutic intervention.

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Acknowledgments

The research was supported by grants from the Heilongjiang Postdoctoral Fund (LBH-Z12157), the foundation of Heilongjiang Educational Committee (12531343), the foundation of Heilongjiang Health Bureau (2012-624), the Youth Foundation of the Second Affiliated Hospital of Harbin Medical University (QN2011-01), the National science Foundation of china (81241085, 81372902, 81272965), the key project of Natural Science Foundation of Heilongjiang Province of China (ZD201215/H1302), the Research Fund for the Doctoral Program of Higher Education of China (20102307110007), and the science and technology innovation talent research funds of Harbin (2012RFXXS072).

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The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. Department of Otolaryngology, Head and Neck Surgery, The Second Affiliated Hospital, Harbin Medical University, Harbin, 150081, China

    Linli Tian, Jiarui Zhang, Jingchun Ge, Hui Xiao, Jianguang Lu, Ming Liu & Yanan Sun

  2. Laboratory of Medical Genetics, Harbin Medical University, Harbin, China

    Songbin Fu

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  1. Linli Tian
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  2. Jiarui Zhang
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  7. Ming Liu
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  8. Yanan Sun
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Correspondence to Ming Liu or Yanan Sun.

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Linli Tian and Jiarui Zhang are co-first authors. Ming Liu and Yanan Sun are co-corresponding authors.

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Tian, L., Zhang, J., Ge, J. et al. MicroRNA-205 suppresses proliferation and promotes apoptosis in laryngeal squamous cell carcinoma. Med Oncol 31, 785 (2014). https://doi.org/10.1007/s12032-013-0785-3

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