Downregulation of miR-874-3p promotes chemotherapeutic resistance in colorectal cancer via inactivation of the Hippo signaling pathway

Oncol Rep. 2017 Dec;38(6):3376-3386. doi: 10.3892/or.2017.6041. Epub 2017 Oct 17.

Abstract

Overcoming resistance to chemotherapy is an arduous challenge in the treatment of colorectal cancer (CRC), particularly since the underlying molecular mechanisms remain obscure. In the present study, we reported that miR‑874-3p was markedly downregulated in CRC tissues compared with that in adjacent normal colorectal epithelial tissues. Upregulation of miR-874-3p attenuated the chemoresistance of CRC cells to 5-fluorouracil (5-FU) in vitro and in vivo. Conversely, inhibition of miR-874-3p yielded an opposite effect. Furthermore, our results demonstrated that miR-874-3p directly inhibited the expression of transcriptional co-activators YAP and TAZ of the Hippo signaling pathway, resulting in the inactivation of the TEAD transcription. Thus, our findings clarify a novel mechanism by which miR-874-3p restores chemotherapeutic sensitivity of CRC to 5-FU, indicating that offering miR-874-3p mimics in combination with 5-FU may serve as a new therapeutic strategy to circumvent the chemoresistance in CRC.

MeSH terms

  • Aged
  • Apoptosis / drug effects
  • Cell Proliferation / drug effects
  • Colorectal Neoplasms / drug therapy*
  • Colorectal Neoplasms / genetics
  • Colorectal Neoplasms / pathology
  • DNA-Binding Proteins / genetics
  • Drug Resistance, Neoplasm / drug effects*
  • Female
  • Fluorouracil / administration & dosage
  • Gene Expression Regulation, Neoplastic
  • Hippo Signaling Pathway
  • Humans
  • Male
  • MicroRNAs / genetics*
  • Middle Aged
  • Nuclear Proteins / genetics
  • Protein Serine-Threonine Kinases / genetics*
  • Signal Transduction / drug effects
  • TEA Domain Transcription Factors
  • Transcription Factors / genetics
  • Xenograft Model Antitumor Assays

Substances

  • DNA-Binding Proteins
  • MIRN874 microRNA, human
  • MicroRNAs
  • Nuclear Proteins
  • TEA Domain Transcription Factors
  • TEAD1 protein, human
  • Transcription Factors
  • Protein Serine-Threonine Kinases
  • Fluorouracil