miR-1 suppresses the growth of esophageal squamous cell carcinoma in vivo and in vitro through the downregulation of MET, cyclin D1 and CDK4 expression

Int J Mol Med. 2016 Jul;38(1):113-22. doi: 10.3892/ijmm.2016.2619. Epub 2016 May 31.

Abstract

Several aberrant microRNAs (miRNAs or miRs) have been implicated in esophageal cancer (EC), which is widely prevalent in China. However, their role in EC tumorigenesis has not yet been fully elucidated. In the present study, we determined that miR‑1 was downregulated in esophageal squamous cell carcinoma (ESCC) tissues compared with adjacent non-neoplastic tissues using RT-qPCR, and confirmed this using an ESCC cell line. Using a nude mouse xenograft model, we confirmed that the re-expression of miR‑1 significantly inhibited ESCC tumor growth. A tetrazolium assay and a trypan blue exclusion assay revealed that miR‑1 suppressed ESCC cell proliferation and increased apoptosis, whereas the silencing of miR‑1 promoted cell proliferation and decreased apoptosis, suggesting that miR‑1 is a novel tumor suppressor. To elucidate the molecular mechanisms of action of miR‑1 in ESCC, we investigated putative targets using bioinformatics tools. MET, cyclin D1 and cyclin-dependent kinase 4 (CDK4), which are involved in the hepatocyte growth factor (HGF)/MET signaling pathway, were found to be targets of miR‑1. miR‑1 expression inversely correlated with MET, cyclin D1 and CDK4 expression in ESCC cells. miR‑1 directly targeted MET, cyclin D1 and CDK4, suppressing ESCC cell growth. The newly identified miR‑1/MET/cyclin D1/CDK4 axis provides new insight into the molecular mechanisms of ESCC pathogenesis and indicates a novel strategy for the diagnosis and treatment of ESCC.

MeSH terms

  • 3' Untranslated Regions / genetics
  • Animals
  • Apoptosis / genetics
  • Base Sequence
  • Carcinoma, Squamous Cell / genetics*
  • Carcinoma, Squamous Cell / pathology*
  • Cell Line, Tumor
  • Cell Proliferation
  • Cyclin D1 / genetics*
  • Cyclin D1 / metabolism
  • Cyclin-Dependent Kinase 4 / genetics*
  • Cyclin-Dependent Kinase 4 / metabolism
  • Down-Regulation / genetics*
  • Esophageal Neoplasms / genetics*
  • Esophageal Neoplasms / pathology*
  • Esophageal Squamous Cell Carcinoma
  • Female
  • Gene Expression Regulation, Neoplastic*
  • Humans
  • Immunohistochemistry
  • Luciferases / metabolism
  • Male
  • Mice, Inbred BALB C
  • Mice, Nude
  • MicroRNAs / genetics
  • MicroRNAs / metabolism*
  • Middle Aged
  • Proto-Oncogene Proteins c-met / genetics*
  • Proto-Oncogene Proteins c-met / metabolism
  • Transfection
  • Xenograft Model Antitumor Assays

Substances

  • 3' Untranslated Regions
  • CCND1 protein, human
  • MIRN1 microRNA, human
  • MicroRNAs
  • Cyclin D1
  • Luciferases
  • Proto-Oncogene Proteins c-met
  • CDK4 protein, human
  • Cyclin-Dependent Kinase 4