MiR-302b regulates cell functions and acts as a potential biomarker to predict recurrence in bladder cancer

Life Sci. 2018 Sep 15:209:15-23. doi: 10.1016/j.lfs.2018.07.057. Epub 2018 Jul 31.


Background: Bladder cancer is the most common urogenital tumor with substantial morbidity, high recurrence rate and mortality. miRNAs, a class of endogenous noncoding RNA, were found to involve in the genesis, maintenance and metastasis of cancer. Genomic profiling revealed that miR-302b is down-regulated in bladder cancer while its functions in bladder cancer remain to be ascertained.

Methods: Cell functional assays including wound healing assay, CCK-8 assay, Transwell assay and flow cytometry assay were performed to clarify the functions of miR-302b expression in cell proliferation, migration, invasion and apoptosis in BC. Furthermore, RT-qPCR was performed to study the expression of miR-302b in bladder cancer tissues and the prognostic value of altered miR-302b expression with 48 formalin-fixed paraffin-embedded bladder urothelial carcinoma samples.

Results: The results of RT-qPCR demonstrated that expression level of miR-302b was significantly reduced in bladder cancer tissues and cell lines. The cells after transfected with miR-302b mimic showed lower mobility, lower proliferation and increased apoptosis, while opposite results were obtained after inhibiting the expression of miR-302b. The prognosis analysis demonstrated that the patients with low expression of miR-302b experienced high risks of recurrence.

Conclusions: The results of our study demonstrate that miR-302b regulates cell functions and acts as a potential biomarker to predict recurrence in bladder cancer.

Keywords: Biomarker; Bladder cancer; miR-302b; microRNA.

MeSH terms

  • Apoptosis
  • Biomarkers, Tumor / genetics*
  • Cell Movement
  • Cell Proliferation
  • Female
  • Gene Expression Regulation, Neoplastic*
  • Humans
  • Male
  • MicroRNAs / genetics*
  • Middle Aged
  • Neoplasm Recurrence, Local / genetics
  • Neoplasm Recurrence, Local / pathology*
  • Neoplasm Recurrence, Local / surgery
  • Prognosis
  • Urinary Bladder Neoplasms / genetics
  • Urinary Bladder Neoplasms / pathology*
  • Urinary Bladder Neoplasms / surgery


  • Biomarkers, Tumor
  • MIRN302A microRNA, human
  • MicroRNAs