Downregulation of microRNA-211 is involved in expression of preferentially expressed antigen of melanoma in melanoma cells

Int J Oncol. 2011 Sep;39(3):665-72. doi: 10.3892/ijo.2011.1084. Epub 2011 Jun 16.

Abstract

MicroRNAs (miRNAs) are small non-coding RNAs whose aberrations are involved in the initiation and progression of human cancers. To seek unique miRNAs contributing to melanoma tumorigenesis, we investigated the global miRNA expression profile of 7 melanoma cell lines and 3 primary cultures of neonatal human epidermal melanocytes (NHEMs) using the stem-loop real-time PCR method. We found 7 miRNAs that were commonly downregulated and 18 that were upregulated in all of the melanoma cell lines in comparison with the 3 primary cultures of NHEMs. We focused on one commonly downregulated miRNA (miR-211), and analyzed its relationship to the expression of preferentially expressed antigen of melanoma (PRAME) protein, which is a potential target of miR-211. We found that all melanoma cell lines exhibited marked down--regulation of miR-211 and upregulation of PRAME mRNA/protein expression in comparison with NHEMs (P<0.05). A significant inverse correlation between miR-211 and PRAME protein expression was found in melanoma cell lines and primary cultures of NHEMs (correlation coefficient of -0.733, P<0.05). We demonstrated that overexpression of miR-211 induced a reduction of PRAME protein levels, and confirmed the target specificity between miR-211 and PRAME by luciferase reporter assay. These results suggest that downregulation of miR-211 may be partly involved in aberrant expression of the PRAME protein in melanoma cells.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antigens, Neoplasm / biosynthesis*
  • Antigens, Neoplasm / genetics
  • Cell Line, Tumor
  • Down-Regulation
  • HEK293 Cells
  • Humans
  • Melanoma / genetics
  • Melanoma / immunology
  • Melanoma / metabolism*
  • Melanoma / pathology
  • MicroRNAs / biosynthesis*
  • MicroRNAs / genetics
  • Substrate Specificity
  • Transfection

Substances

  • Antigens, Neoplasm
  • MIRN211 microRNA, human
  • MicroRNAs
  • PRAME protein, human