NogoR1 and PirB signaling stimulates neural stem cell survival and proliferation

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NogoR1 and PirB signaling stimulates neural stem cell survival and proliferation
Title:
NogoR1 and PirB signaling stimulates neural stem cell survival and proliferation
Journal Title:
STEM CELLS
Keywords:
Publication Date:
21 January 2014
Citation:
Abstract:
Neural stem cells (NSCs) and neural progenitors (NPs) in the mammalian neocortex give rise to the main cell types of the nervous system. The biological behavior of these NSCs and NPs is regulated by extracellular niche derived autocrine-paracrine signaling factors on a developmental timeline. Our previous reports [1, 2] have shown that chondroitin sulfate proteoglycan (CSPG) and ApolipoproteinE (ApoE) are autocrine-paracrine survival factors for NSCs. NogoA, a myelin related protein, is expressed in the cortical ventricular zones where NSCs reside. However, the functional role of Nogo signaling proteins in NSC behavior is not completely understood. In this study, we show that NogoA receptors, NogoR1 and PirB, are expressed in the ventricular zone where NSCs reside between E10.5-14.5 but not at E15.5. Nogo ligands stimulate NSC survival and proliferation in a dosage dependent manner in vitro. NogoR1 and PirB, are low and high affinity Nogo receptors respectively, and are responsible for the effects of Nogo ligands on NSC behavior. Inhibition of autocrine-paracrine Nogo signaling blocks NSC survival and proliferation. In NSCs, NogoR1 functions through Rho whereas PirB uses Shp1/2 signaling pathways to control NSC behavior. Taken together, this work suggests that Nogo signaling is an important pathway for survival of NSCs. Stem Cells 2014.
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PublisherCopyrights
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ISSN:
1066-5099
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