Published 24 May 2004. doi:10.1083/jcb.200311141
The Rockefeller University Press, 0021-9525 $8.00
JCB, Volume 165, Number 4, 575-589
NG2-expressing cells in the subventricular zone are type Clike cells and contribute to interneuron generation in the postnatal hippocampus
Adan A. Aguirre1,
Ramesh Chittajallu1,
Shibeshih Belachew2, and
Vittorio Gallo1
1 Center for Neuroscience Research, Children's Research Institute, Children's National Medical Center, Washington, DC 20010
2 Center for Cellular and Molecular Neurobiology, University of Liège, 4020 Liège, Belgium
Address correspondence to Vittorio Gallo, Center for Neuroscience Research, Children's Research Institute, Rm. 5345, Children's National Medical Center, 111 Michigan Ave., N.W., Washington, DC 20010. Tel.: (202) 884-4996. Fax: (202) 884-4988. email: vgallo{at}cnmcresearch.org
The subventricular zone (SVZ) is a source of neural progenitors throughout brain development. The identification and purification of these progenitors and the analysis of their lineage potential are fundamental issues for future brain repair therapies. We demonstrate that early postnatal NG2-expressing (NG2+) progenitor cells located in the SVZ self-renew in vitro and display phenotypic features of transit-amplifier type Clike multipotent cells. NG2+ cells in the SVZ are highly proliferative and express the epidermal growth factor receptor, the transcription factors Dlx, Mash1, and Olig2, and the Lewis X (LeX) antigen. We show that grafted early postnatal NG2+ cells generate hippocampal GABAergic interneurons that propagate action potentials and receive functional glutamatergic synaptic inputs. Our work identifies Dlx+/Mash1+/LeX+/NG2+/GFAP-negative cells of the SVZ as a new class of postnatal multipotent progenitor cells that may represent a specific cellular reservoir for renewal of postnatal and adult inhibitory interneurons in the hippocampus.
Key Words: neural stem cells; homeobox transcription factors; bHLH genes; progenitor cell transplantation; synaptic transmission
The online version of this article includes supplemental material.
Abbreviations used in this paper: CNP, 2',3'-cyclic nucleotide 3'-phosphodiesterase; DG, dentate gyrus; DIV, days in vitro; EGFR, epidermal growth factor receptor; LeX, Lewis X; NSC, neural stem cell; SVZ, subventricular zone.

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