miR-144 downregulation increases bladder cancer cell proliferation by targeting EZH2 and regulating Wnt signaling

FEBS J. 2013 Sep;280(18):4531-8. doi: 10.1111/febs.12417. Epub 2013 Jul 25.


microRNAs (miRNAs) have been proposed to be key regulators of diverse biological processes such as transcriptional regulation, cell growth and tumorigenesis. Wnt signaling plays an important role in the regulation of tumorigenesis and cancer progression. However, little is known about whether miR-144 regulates bladder cancer cell proliferation by controlling Wnt signaling. In this study, we found that the miR-144 expression level is significantly decreased in bladder cancer cell lines as well as in clinical cancer tissues. miR-144 inhibitor blocks the expression of endogenous miR-144 and promotes cancer cell proliferation, whereas miR-144 overexpression is sufficient to inhibit cell proliferation. We further demonstrated that enhancer of zeste homolog 2 (EZH2) is a target gene of miR-144. miR-144 downregulation relieves miR-144-mediated repression of EZH2, which results in activation of Wnt/β-catenin signaling and subsequent cell proliferation. These data suggest miR-144 is an essential mediator of bladder cancer cell proliferation, thus offering a new target for the development of therapeutic agents against bladder cancer.

Keywords: EZH2; Wnt; bladder cancer; miR-144; miRNA.

MeSH terms

  • Aged
  • Aged, 80 and over
  • Base Sequence
  • Cell Line, Tumor
  • Cell Proliferation
  • Enhancer of Zeste Homolog 2 Protein
  • Female
  • Gene Expression Regulation, Neoplastic*
  • Humans
  • Male
  • MicroRNAs / genetics*
  • MicroRNAs / metabolism
  • Middle Aged
  • Molecular Sequence Data
  • Polycomb Repressive Complex 2 / genetics*
  • Polycomb Repressive Complex 2 / metabolism
  • Primary Cell Culture
  • Protein Binding
  • Urinary Bladder / metabolism
  • Urinary Bladder / pathology
  • Urinary Bladder Neoplasms / genetics*
  • Urinary Bladder Neoplasms / metabolism
  • Urinary Bladder Neoplasms / pathology
  • Urothelium / metabolism
  • Urothelium / pathology
  • Wnt Proteins / genetics
  • Wnt Proteins / metabolism
  • Wnt Signaling Pathway*
  • beta Catenin / genetics
  • beta Catenin / metabolism


  • CTNNB1 protein, human
  • MIRN144 microRNA, human
  • MicroRNAs
  • Wnt Proteins
  • beta Catenin
  • EZH2 protein, human
  • Enhancer of Zeste Homolog 2 Protein
  • Polycomb Repressive Complex 2