Cell Reports (Aug 2019)

Driving Neuronal Differentiation through Reversal of an ERK1/2-miR-124-SOX9 Axis Abrogates Glioblastoma Aggressiveness

  • Hanna Sabelström,
  • Rebecca Petri,
  • Ksenya Shchors,
  • Rahul Jandial,
  • Christin Schmidt,
  • Rohit Sacheva,
  • Selma Masic,
  • Edith Yuan,
  • Trenten Fenster,
  • Michael Martinez,
  • Supna Saxena,
  • Theodore P. Nicolaides,
  • Shirin Ilkhanizadeh,
  • Mitchel S. Berger,
  • Evan Y. Snyder,
  • William A. Weiss,
  • Johan Jakobsson,
  • Anders I. Persson

Journal volume & issue
Vol. 28, no. 8
pp. 2064 – 2079.e11

Abstract

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Summary: Identifying cellular programs that drive cancers to be stem-like and treatment resistant is critical to improving outcomes in patients. Here, we demonstrate that constitutive extracellular signal-regulated kinase 1/2 (ERK1/2) activation sustains a stem-like state in glioblastoma (GBM), the most common primary malignant brain tumor. Pharmacological inhibition of ERK1/2 activation restores neurogenesis during murine astrocytoma formation, inducing neuronal differentiation in tumorspheres. Constitutive ERK1/2 activation globally regulates miRNA expression in murine and human GBMs, while neuronal differentiation of GBM tumorspheres following the inhibition of ERK1/2 activation requires the functional expression of miR-124 and the depletion of its target gene SOX9. Overexpression of miR124 depletes SOX9 in vivo and promotes a stem-like-to-neuronal transition, with reduced tumorigenicity and increased radiation sensitivity. Providing a rationale for reports demonstrating miR-124-induced abrogation of GBM aggressiveness, we conclude that reversal of an ERK1/2-miR-124-SOX9 axis induces a neuronal phenotype and that enforcing neuronal differentiation represents a therapeutic strategy to improve outcomes in GBM. : Sabelström et al. show that the loss of neurogenesis is reversible during neural stem cell-derived glioma formation. Pharmacological inhibition of ERK1/2 globally regulates miRNAs and induces neuronal differentiation, a process that is dependent on the modulation of an miR-124-SOX9 axis in glioblastoma (GBM) cells. The overexpression of miR-124 induces neuronal differentiation that abrogates GBM aggressiveness. Keywords: brain, cancer, differentiation, glioma, glioblastoma, microRNA, neural stem cell, neurogenesis, neuron, tumor