Two mature products of MIR-491 coordinate to suppress key cancer hallmarks in glioblastoma

X. Li, Y. Liu, K. J. Granberg, Q. Wang, L. M. Moore, P. Ji, J. Gumin, E. P. Sulman, G. A. Calin, H. Haapasalo, M. Nykter, I. Shmulevich, G. N. Fuller, F. F. Lang, W. Zhang

Research output: Contribution to journalArticle

54 Scopus citations

Abstract

MIR-491 is commonly co-deleted with its adjacent CDKN2A on chromosome 9p21.3 in glioblastoma multiforme (GBM). However, it is not known whether deletion of MIR-491 is only a passenger event or has an important role. Small-RNA sequencing of samples from GBM patients demonstrated that both mature products of MIR-491 (miR-491-5p and-3p) are downregulated in tumors compared with the normal brain. The integration of GBM data from The Cancer Genome Atlas (TCGA), miRNA target prediction and reporter assays showed that miR-491-5p directly targets EGFR, CDK6 and Bcl-xL, whereas miR-491-3p targets IGFBP2 and CDK6. Functionally, miR-491-3p inhibited glioma cell invasion; overexpression of both miR-491-5p and-3p inhibited proliferation of glioma cell lines and impaired the propagation of glioma stem cells (GSCs), thereby prolonging survival of xenograft mice. Moreover, knockdown of miR-491-5p in primary Ink4a-Arf-null mouse glial progenitor cells exacerbated cell proliferation and invasion. Therefore, MIR-491 is a tumor suppressor gene that, by utilizing both mature forms, coordinately controls the key cancer hallmarks: proliferation, invasion and stem cell propagation.

Original languageEnglish (US)
Pages (from-to)1619-1628
Number of pages10
JournalOncogene
Volume34
Issue number13
DOIs
StatePublished - Mar 26 2015
Externally publishedYes

ASJC Scopus subject areas

  • Molecular Biology
  • Genetics
  • Cancer Research

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    Li, X., Liu, Y., Granberg, K. J., Wang, Q., Moore, L. M., Ji, P., Gumin, J., Sulman, E. P., Calin, G. A., Haapasalo, H., Nykter, M., Shmulevich, I., Fuller, G. N., Lang, F. F., & Zhang, W. (2015). Two mature products of MIR-491 coordinate to suppress key cancer hallmarks in glioblastoma. Oncogene, 34(13), 1619-1628. https://doi.org/10.1038/onc.2014.98