miRNA-7-5p inhibits melanoma cell migration and invasion

Biochem Biophys Res Commun. 2013 Jan 11;430(2):706-10. doi: 10.1016/j.bbrc.2012.11.086. Epub 2012 Dec 1.


Aberrant expression of microRNAs (miRNAs), a class of small non-coding regulatory RNAs, has been implicated in the development and progression of melanoma. However, the precise mechanistic role of many of these miRNAs remains unclear. We have investigated the functional role of miR-7-5p in melanoma, and demonstrate that miR-7-5p expression is reduced in metastatic melanoma-derived cell lines compared with primary melanoma cells, and that when ectopically expressed miR-7-5p significantly inhibits melanoma cell migration and invasion. Additionally, we report that insulin receptor substrate-2 (IRS-2) is a target of miR-7-5p in melanoma cells, and using RNA interference (RNAi) we provide evidence that IRS-2 activates protein kinase B (Akt), and promotes melanoma cell migration. Thus, miR-7-5p may represent a novel tumor suppressor miRNA in melanoma, acting at least in part via its inhibition of IRS-2 expression and oncogenic Akt signaling.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Cell Line, Tumor
  • Cell Movement*
  • Humans
  • Insulin Receptor Substrate Proteins / metabolism
  • Melanoma / metabolism
  • Melanoma / pathology*
  • MicroRNAs / metabolism*
  • Neoplasm Invasiveness
  • Proto-Oncogene Proteins c-akt / metabolism


  • IRS2 protein, human
  • Insulin Receptor Substrate Proteins
  • MIRN7 microRNA, human
  • MicroRNAs
  • Proto-Oncogene Proteins c-akt