Identification of a sustained neurogenic zone at the dorsal surface of the adult mouse hippocampus and its regulation by the chemokine SDF-1

Abdelhak Belmadani*, Dongjun Ren, Bula J. Bhattacharyya, Katharina B. Rothwangl, Thomas J. Hope, Harris Perlman, Richard J. Miller

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

We identified a previously unknown neurogenic region at the dorsal surface of the hippocampus; (the "subhippocampal zone," SHZ) in the adult brain. Using a reporter mouse in which SHZ cells and their progeny could be traced through the expression of EGFP under the control of the CXCR4 chemokine receptor promoter we observed the presence of a pool of EGFP expressing cells migrating in direction of the dentate gyrus (DG), which is maintained throughout adulthood. This population appeared to originate from the SHZ where cells entered a caudal migratory stream (aCMS) that included the fimbria, the meninges and the DG. Deletion of CXCR4 from neural stem cells (NSCs) or neuroinflammation resulted in the appearance of neurons in the DG, which were the result of migration of NSCs from the SHZ. Some of these neurons were ectopically placed. Our observations indicate that the SHZ is a neurogenic zone in the adult brain through migration of NSCs in the aCMS. Regulation of CXCR4 signaling in these cells may be involved in repair of the DG and may also give rise to ectopic granule cells in the DG in the context of neuropathology.

Original languageEnglish (US)
Pages (from-to)1224-1241
Number of pages18
JournalHippocampus
Volume25
Issue number11
DOIs
StatePublished - Nov 2015

Keywords

  • Adult neurogenesis
  • CXCR4
  • Chemokines
  • Dentate gyrus
  • SDF-1

ASJC Scopus subject areas

  • Cognitive Neuroscience

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