NogoR1 and PirB signaling stimulates neural stem cell survival and proliferation.
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 [Plos One 2010;5:e15341; J Neurochem 2011;117:565-578] have shown that chondroitin sulfate proteoglycan and ApolipoproteinE 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 and 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.
Institute of Medical Biology, 8A Biomedical Grove, #05-37 Immunos, Singapore.
Srinivas
S
Ramasamy
Fenggang
F
Yu
Yuan
Y
Hong Yu
Hariharan
H
Srivats
Gavin Stewart
GS
Dawe
Sohail
S
Ahmed
D001057:Apolipoproteins E / Q000378:metabolism; D019898:Autocrine Communication / Q000187:drug effects; D002452:Cell Count; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D048429:Cell Size; D002470:Cell Survival / Q000187:drug effects; D011508:Chondroitin Sulfate Proteoglycans / Q000378:metabolism; D004622:Embryo, Mammalian / Q000166:cytology; D005260:Female; D058851:GPI-Linked Proteins / Q000172:deficiency / Q000378:metabolism; D057809:HEK293 Cells; D006801:Humans; D009185:Myelin Proteins / Q000172:deficiency / Q000378:metabolism* / Q000494:pharmacology; D058953:Neural Stem Cells / Q000166:cytology* / Q000187:drug effects / Q000378:metabolism; D000070798:Nogo Proteins; D000070816:Nogo Receptor 1; D019899:Paracrine Communication / Q000187:drug effects; D016548:Prosencephalon / Q000196:embryology / Q000378:metabolism; D011956:Receptors, Cell Surface / Q000172:deficiency / Q000378:metabolism*; D011971:Receptors, Immunologic / Q000172:deficiency / Q000378:metabolism*; D015398:Signal Transduction / Q000187:drug effects; D018874:Spheroids, Cellular / Q000166:cytology / Q000378:metabolism
D001057:Apolipoproteins E; D011508:Chondroitin Sulfate Proteoglycans; D058851:GPI-Linked Proteins; D009185:Myelin Proteins; D000070798:Nogo Proteins; D000070816:Nogo Receptor 1; C105949:Pirb protein, mouse; C000603199:RTN4 protein, human; D011956:Receptors, Cell Surface; D011971:Receptors, Immunologic; C000603201:Rtn4 protein, mouse; C419790:Rtn4r protein, mouse
Cell signaling; Neural stem cell; Progenitor cells; Proliferation