Open Access

Let‑7b acts as a tumor suppressor in osteosarcoma via targeting IGF1R

  • Authors:
    • Kai Zhang
    • Weiwei Wang
    • Yi Liu
    • Aijun Guo
    • Donghui Yang
  • View Affiliations

  • Published online on: December 4, 2018     https://doi.org/10.3892/ol.2018.9793
  • Pages: 1646-1654
  • Copyright: © Zhang et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

MicroRNAs serve crucial functions in cancer progression by inhibiting the translation of target genes and causing mRNA degradation. However, the underlying regulatory mechanism of Let‑7b in osteosarcoma (OS) has not, to the best of our knowledge, been comprehensively elucidated. The aim of the present study was to investigate the function of Let‑7b in OS and clarify the regulation of insulin‑like growth factor 1 receptor (IGF1R) by Let‑7b. It was observed that Let‑7b was significantly downregulated in OS tissues and cell lines compared with the matched adjacent non‑tumorous tissues and human normal osteoblastic cell line hFOB 1.19. Overexpression of Let‑7b significantly inhibited the proliferation and invasion of U2OS and SAOS‑2 cells. A luciferase reporter assay validated that IGF1R was a downstream and functional target of Let‑7b. Let‑7b was also able to decrease the expression levels of IGF1R protein. Functional studies revealed that the antitumor effect of Let‑7b was probably due to targeting and suppressing IGF1R expression. Furthermore, in OS tissues, IGF1R was identified to be significantly upregulated and negatively correlated with Let‑7b levels. In conclusion, the results of the present study indicated that Let‑7b suppresses OS cellular proliferation and invasion via targeting IGF1R. A novel candidate prognostic factor was identified and it is suggested that the Let‑7b/IGF1R axis may represent a novel anti‑metastasis therapeutic target in OS.
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February-2019
Volume 17 Issue 2

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Copy and paste a formatted citation
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Spandidos Publications style
Zhang K, Wang W, Liu Y, Guo A and Yang D: Let‑7b acts as a tumor suppressor in osteosarcoma via targeting IGF1R. Oncol Lett 17: 1646-1654, 2019
APA
Zhang, K., Wang, W., Liu, Y., Guo, A., & Yang, D. (2019). Let‑7b acts as a tumor suppressor in osteosarcoma via targeting IGF1R. Oncology Letters, 17, 1646-1654. https://doi.org/10.3892/ol.2018.9793
MLA
Zhang, K., Wang, W., Liu, Y., Guo, A., Yang, D."Let‑7b acts as a tumor suppressor in osteosarcoma via targeting IGF1R". Oncology Letters 17.2 (2019): 1646-1654.
Chicago
Zhang, K., Wang, W., Liu, Y., Guo, A., Yang, D."Let‑7b acts as a tumor suppressor in osteosarcoma via targeting IGF1R". Oncology Letters 17, no. 2 (2019): 1646-1654. https://doi.org/10.3892/ol.2018.9793