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Genes Dev. 2015 Aug 15;29(16):1677-82. doi: 10.1101/gad.261677.115. Epub 2015 Aug 13.

Neurofibromatosis-1 regulation of neural stem cell proliferation and multilineage differentiation operates through distinct RAS effector pathways.

Author information

1
Department of Neurology, Washington University School of Medicine, St. Louis, Missouri 63110, USA.

Abstract

Neurofibromatosis type 1 (NF1) is a common neurodevelopmental disorder caused by impaired function of the neurofibromin RAS regulator. Using a combination of Nf1 genetically engineered mice and pharmacological/genetic inhibition approaches, we report that neurofibromin differentially controls neural stem cell (NSC) proliferation and multilineage differentiation through the selective use of the PI3K/AKT and RAF/MEK pathways. While PI3K/AKT governs neurofibromin-regulated NSC proliferation, multilineage differentiation is MEK-dependent. Moreover, whereas MEK-regulated multilineage differentiation requires Smad3-induced Jagged-1 expression and Notch activation, MEK/Smad3-regulated Hes1 induction is only responsible for astrocyte and neuronal differentiation. Collectively, these findings establish distinct roles for the RAS effector pathways in regulating brain NSC function.

KEYWORDS:

AKT; Jagged1; MEK; Notch; astrocyte; neurofibromin; neuroglial progenitor

PMID:
26272820
PMCID:
PMC4561477
DOI:
10.1101/gad.261677.115
[Indexed for MEDLINE]
Free PMC Article

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