miR-1 and miR-133b are differentially expressed in patients with recurrent prostate cancer

PLoS One. 2014 Jun 26;9(6):e98675. doi: 10.1371/journal.pone.0098675. eCollection 2014.

Abstract

Prostate cancer (PCa) is currently the most frequently diagnosed malignancy in the western countries. It is more prevalent in older men with 75% of the incident cases above 65 years old. After radical prostatectomy, approximately 30% of men develop clinical recurrence with elevated serum prostate-specific antigen levels. Therefore, it is important to unravel the molecular mechanisms underlying PCa progression to develop novel diagnostic/therapeutic approaches. In this study, it is aimed to compare the microRNA (miRNA) profile of recurrent and non-recurrent prostate tumor tissues to explore the possible involvement of miRNAs in PCa progression. Total RNA from 41 recurrent and 41 non-recurrent PCa tissue samples were used to investigate the miRNA signature in PCa specimens. First of all, 20 recurrent and 20 non-recurrent PCa samples were profiled using miRNA microarray chips. Of the differentially expressed miRNAs, miR-1, miR-133b and miR-145* were selected for further validation with qRT-PCR in a different set of 21 recurrent and 21 non-recurrent PCa samples. Data were statistically analyzed using two-sided Student's t-test, Pearson Correlation test, Receiver operating characteristic analysis. Our results demonstrated that miR-1 and mir-133b have been significantly downregulated in recurrent PCa specimens in comparison to non-recurrent PCa samples and have sufficient power to distinguish recurrent specimens from non-recurrent ones on their own. Here, we report that the relative expression of miR-1 and mir-133b have been significantly reduced in recurrent PCa specimens in comparison to non-recurrent PCa samples, which can serve as novel biomarkers for prediction of PCa progression.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Aged
  • Biomarkers, Tumor / genetics*
  • Biomarkers, Tumor / metabolism
  • Case-Control Studies
  • Down-Regulation
  • Humans
  • Male
  • MicroRNAs / genetics*
  • MicroRNAs / metabolism
  • Middle Aged
  • Prostatic Neoplasms / metabolism*
  • Prostatic Neoplasms / pathology
  • Recurrence

Substances

  • Biomarkers, Tumor
  • MIRN1 microRNA, human
  • MIRN133 microRNA, human
  • MicroRNAs