Identification of a transient subpial neurogenic zone in the developing dentate gyrus and its regulation by Cxcl12 and reelin signaling.
One striking feature of dentate gyrus development, distinct from the other cortical structures, is the relocation of neural precursors from the ventricular zone to the forming dentate pole to produce a lifelong neurogenic subgranular zone (SGZ). In this study, we demonstrate that dentate progenitors first dwell for up to 1 week in a previously unrecognized neurogenic zone intimately associated with the pial meningeal surface lining the outer edge of the forming dentate. This zone also serves as the organizational matrix for the initial formation of the dentate glial scaffolding. Timely clearance of neural precursors from their transient location depends on reelin, whereas initial formation of this transient stem cell niche requires Cxcl12-Cxcr4 signaling. The final settlement of the neural precursors at the subgranular zone relies on a pertussis toxin-sensitive pathway independent of Cxcl12-Cxcr4 signaling. Furthermore, genetic fate-mapping analysis suggests that subpial precursors contribute to the SGZ formation. These results demonstrate that the relocation of neural precursors in the dentate gyrus consists of discrete steps regulated by multiple pathways.
Li
Guangnan
G
Department of Neurology, UCSF School of Medicine, San Francisco, CA 94158, USA. grant.li@ucsf.edu
Kataoka
Hiroshi
H
Coughlin
Shaun R
SR
Pleasure
Samuel J
SJ
D000818:Animals; D015816:Cell Adhesion Molecules, Neuronal / Q000235:genetics / Q000378:metabolism*; D002454:Cell Differentiation; D054377:Chemokine CXCL12 / Q000235:genetics / Q000378:metabolism*; D018891:Dentate Gyrus / Q000196:embryology* / Q000254:growth & development / Q000378:metabolism*; D053595:Embryonic Stem Cells / Q000166:cytology / Q000378:metabolism; D016326:Extracellular Matrix Proteins / Q000235:genetics / Q000378:metabolism*; D005260:Female; D018398:Homeodomain Proteins / Q000235:genetics / Q000378:metabolism; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D008822:Mice, Transgenic; D008959:Models, Neurological; D009419:Nerve Tissue Proteins / Q000235:genetics / Q000378:metabolism*; D055495:Neurogenesis / Q000235:genetics / Q000502:physiology*; D009457:Neuroglia / Q000166:cytology / Q000378:metabolism; D011247:Pregnancy; D019718:Receptors, CXCR4 / Q000235:genetics / Q000378:metabolism; D000091042:Reelin Protein; D012697:Serine Endopeptidases / Q000235:genetics / Q000378:metabolism*; D015398:Signal Transduction; D014157:Transcription Factors / Q000172:deficiency / Q000235:genetics / Q000378:metabolism; D000099260:Empty Spiracles Homeobox Proteins
D015816:Cell Adhesion Molecules, Neuronal; D054377:Chemokine CXCL12; D016326:Extracellular Matrix Proteins; D018398:Homeodomain Proteins; D009419:Nerve Tissue Proteins; D019718:Receptors, CXCR4; D000091042:Reelin Protein; D012697:Serine Endopeptidases; D014157:Transcription Factors; D000099260:Empty Spiracles Homeobox Proteins; C514936:CXCR4 protein, mouse; C515256:Cxcl12 protein, mouse; C000717128:Reln protein, mouse