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miR-145 inhibits invasion and metastasis by directly targeting Smad3 in nasopharyngeal cancer

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Tumor Biology

Abstract

MicroRNA-145 (miR-145) has been implicated in several cancers. However, its role in nasopharyngeal carcinoma (NPC) remains unclear. In this study, we proved that miR-145 was significantly downregulated in NPC and associated with NPC cell metastasis. Moreover, miR-145 suppressed Smad3 by directly binding to the 3′-untranslated region (UTR) of Smad3. Knockdown of Smad3 in NPC cells inhibited cell migration and invasion, which was consistent with the effect of miR-145 in NPC cells. In addition, Smad3 expression was inversely correlated with miR-145 level in clinical NPC samples. Taken together, our findings indicate that miR-145 is a tumour suppressor that affects invasive and metastatic properties of NPC via the miR-145/Smad3 axis, leading us to propose that miR-145 overexpression might be a potential therapeutic strategy of NPC intervention.

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Acknowledgments

We would like to thank the Suzhou Key Laboratory for Molecular Cancer Genetics for their technical assistance. This work was supported by the Innovation Project of Suzhou International Technology Transfer and Cooperation (SH 201209), Suzhou Key Laboratory for Molecular Cancer Genetics (SZS201209) and Suzhou City’s Municipal Youth Fund of Science and Education (KJXW2012003).

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Authors and Affiliations

  1. Department of ENT, The First Affiliated Hospital of Soochow University, Medical College of Soochow University, Suzhou, 215006, China

    Haiping Huang, Peng Sun, Manyi Li, Yihong Wang & Jisheng Liu

  2. Soochow University Laboratory of Cancer Molecular Genetics, Medical College of Soochow University, Suzhou, China

    Zhe Lei & Hong-Tao Zhang

  3. Suzhou Key Laboratory for Molecular Cancer Genetics, Suzhou, China

    Zhe Lei & Hong-Tao Zhang

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  1. Haiping Huang
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  2. Peng Sun
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  3. Zhe Lei
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  4. Manyi Li
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  5. Yihong Wang
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  6. Hong-Tao Zhang
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  7. Jisheng Liu
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Correspondence to Hong-Tao Zhang or Jisheng Liu.

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Haiping Huang, Peng Sun and Zhe Lei contributed equally.

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Huang, H., Sun, P., Lei, Z. et al. miR-145 inhibits invasion and metastasis by directly targeting Smad3 in nasopharyngeal cancer. Tumor Biol. 36, 4123–4131 (2015). https://doi.org/10.1007/s13277-015-3046-6

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  • DOI: https://doi.org/10.1007/s13277-015-3046-6

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