24 mai 2016
Ce document est lié à :
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.celrep.2016.04.086
Ce document est lié à :
info:eu-repo/semantics/altIdentifier/pmid/27184842
Ce document est lié à :
info:eu-repo/semantics/altIdentifier/eissn/2211-1247
Ce document est lié à :
info:eu-repo/semantics/altIdentifier/urn/urn:nbn:ch:serval-BIB_C76FB9B4613C3
info:eu-repo/semantics/openAccess , Copying allowed only for non-profit organizations , https://serval.unil.ch/disclaimer
N. Degrauwe et al., « The RNA Binding Protein IMP2 Preserves Glioblastoma Stem Cells by Preventing let-7 Target Gene Silencing. », Serveur académique Lausannois, ID : 10.1016/j.celrep.2016.04.086
Cancer stem cells (CSCs) can drive tumor growth, and their maintenance may rely on post-transcriptional regulation of gene expression, including that mediated by microRNAs (miRNAs). The let-7 miRNA family has been shown to induce differentiation by silencing stem cell programs. Let-7-mediated target gene suppression is prevented by LIN28A/B, which reduce let-7 biogenesis in normal embryonic and some cancer stem cells and ensure maintenance of stemness. Here, we find that glioblastoma stem cells (GSCs) lack LIN28 and express both let-7 and their target genes, suggesting LIN28-independent protection from let-7 silencing. Using photoactivatable-ribonucleoside-enhanced crosslinking and immunoprecipitation (PAR-CLIP), we show that insulin-like growth factor 2 mRNA-binding protein 2 (IMP2) binds to let-7 miRNA recognition elements (MREs) and prevents let-7 target gene silencing. Our observations define the RNA-binding repertoire of IMP2 and identify a mechanism whereby it supports GSC and neural stem cell specification.