miRNA-223 suppresses FOXO1 and functions as a potential tumor marker in breast cancer

Cell Mol Biol (Noisy-le-grand). 2017 May 20;63(5):113-118. doi: 10.14715/cmb/2017.63.5.21.


Breast cancer is the most commonly diagnosed cancer in women and a leading cause of cancer mortality. MicroRNAs (miRNAs) have been found to play a key role in proliferation, metastasis and invasion of cancer. In previous study, we found that miRNA-223 was significant expression inexosome derived from peripheral blood serum of breast cancer patients than in samples from control subjects, Therefor,the role ofmiRNA-223willbe researched in MCF-7 breast cancer cells.In this study, to explore the role of miRNA-223in influencing cell proliferation, metastasis and invasion of breast cancer, TargetScan tools (http://www.targetscan.org/vert_71/) was used to scan target genes of miRNA-223, and thenmiRNA expression, real time PCR, Western blotting andluciferase report assay were used to test regulates relationship of miRNA-223and its targets,cell viability and BrdU analysiswere used to test cell proliferation of MCF-7 breast cancer cells after expression miRNA-223inhibitor. Scanning targets of miRNA-223found FOXO1 was listed in targets content, and luciferase reporter assay was used to assess and confirm the binding sequence of 3'untranslated region between FOXO1 and miRNA-223. Results showedthat miRNA-223inhibitorexpression increased protein expression level of FOXO1 in MCF-7 breast cancer cells,meanwhile, cell viability and BrdU analysis showed MCF-7 breast cancer cells were suppressed proliferation after up-regulation of FOXO1.In conclusion, we demonstrated that the miRNA-223can maintain cell proliferation of breast cancer cell through targeting FOXO 1, these results provide a new insight in tumor marker and potential therapeutic targets for breast cancer.

Keywords: Breast Cancer; Cell proliferation.; FOXO1; microRNA.

MeSH terms

  • Biomarkers, Tumor / metabolism*
  • Breast Neoplasms / genetics*
  • Breast Neoplasms / pathology
  • Cell Proliferation / genetics
  • Cell Survival / genetics
  • Female
  • Forkhead Box Protein O1 / metabolism*
  • Gene Expression Regulation, Neoplastic
  • Humans
  • MCF-7 Cells
  • MicroRNAs / genetics
  • MicroRNAs / metabolism*


  • Biomarkers, Tumor
  • FOXO1 protein, human
  • Forkhead Box Protein O1
  • MIRN223 microRNA, human
  • MicroRNAs