Upregulation of let‑7f‑5p promotes chemotherapeutic resistance in colorectal cancer by directly repressing several pro‑apoptotic proteins

  • Authors:
    • Yateng Tie
    • Chong Chen
    • Yanli Yang
    • Zhen Qian
    • Hang Yuan
    • Huan Wang
    • Haili Tang
    • Yao Peng
    • Xilin Du
    • Bin Liu
  • View Affiliations

  • Published online on: April 2, 2018     https://doi.org/10.3892/ol.2018.8410
  • Pages: 8695-8702
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Abstract

Colorectal cancer (CRC) is one of the most frequently occurring primary malignant tumors worldwide. Chemotherapeutic resistance is a major clinical problem in the treatment of CRC. Therefore, it is of great importance to investigate novel biomarkers that may predict chemoresistance and facilitate the development of individualized treatment for patients with CRC. The present study reported that let‑7f‑5p expression was elevated in chemotherapy‑resistant CRC tissues compared with chemotherapy‑sensitive tissues. Furthermore, upregulating let‑7f‑5p increased the expression levels of the anti‑apoptotic proteins, B‑cell lymphoma 2 (Bcl‑2) and B‑cell lymphoma‑extra large (Bcl‑xL), and decreased the activity of caspase‑3 and caspase‑9 in CRC cells. By contrast, downregulating let‑7f‑5p yielded the opposite effect. Notably, the results indicated that let‑7f‑5p promoted chemotherapeutic resistance by directly repressing the expression of several pro‑apoptotic proteins, including tumor protein p53, tumor protein p53‑inducible nuclear protein 1, tumor protein p53‑inducible nuclear protein 2 and caspase‑3. Therefore, a novel mechanism by which let‑7f‑5p enhances the resistance of CRC cells to chemotherapeutics has been revealed, indicating that silencing let‑7f‑5p may become an effective therapeutic strategy against CRC.
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June-2018
Volume 15 Issue 6

Print ISSN: 1792-1074
Online ISSN:1792-1082

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Spandidos Publications style
Tie Y, Chen C, Yang Y, Qian Z, Yuan H, Wang H, Tang H, Peng Y, Du X, Liu B, Liu B, et al: Upregulation of let‑7f‑5p promotes chemotherapeutic resistance in colorectal cancer by directly repressing several pro‑apoptotic proteins. Oncol Lett 15: 8695-8702, 2018
APA
Tie, Y., Chen, C., Yang, Y., Qian, Z., Yuan, H., Wang, H. ... Liu, B. (2018). Upregulation of let‑7f‑5p promotes chemotherapeutic resistance in colorectal cancer by directly repressing several pro‑apoptotic proteins. Oncology Letters, 15, 8695-8702. https://doi.org/10.3892/ol.2018.8410
MLA
Tie, Y., Chen, C., Yang, Y., Qian, Z., Yuan, H., Wang, H., Tang, H., Peng, Y., Du, X., Liu, B."Upregulation of let‑7f‑5p promotes chemotherapeutic resistance in colorectal cancer by directly repressing several pro‑apoptotic proteins". Oncology Letters 15.6 (2018): 8695-8702.
Chicago
Tie, Y., Chen, C., Yang, Y., Qian, Z., Yuan, H., Wang, H., Tang, H., Peng, Y., Du, X., Liu, B."Upregulation of let‑7f‑5p promotes chemotherapeutic resistance in colorectal cancer by directly repressing several pro‑apoptotic proteins". Oncology Letters 15, no. 6 (2018): 8695-8702. https://doi.org/10.3892/ol.2018.8410