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The Journal of Neuroscience, November 17, 2004, 24(46):10530-10541; doi:10.1523/JNEUROSCI.3572-04.2004
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Development/Plasticity/Repair
Postnatal Neurogenesis and Gliogenesis in the Olfactory Bulb from NG2-Expressing Progenitors of the Subventricular Zone
Adan Aguirre and
Vittorio Gallo
Center for Neuroscience Research, Children's Research Institute, Children's National Medical Center, Washington, DC 20010
We used a 2',3'-cyclic nucleotide 3'-phosphodiesterase (CNP)-enhanced green fluorescent protein (EGFP) transgenic mouse to study postnatal subventricular zone (SVZ) progenitor fate, with a focus on the olfactory bulb (OB). The postnatal OB of the CNP-EGFP mouse contained EGFP+ interneurons and oligodendrocytes. In the anterior SVZ, the majority of EGFP+ progenitors were NG2+. These NG2+/EGFP+ progenitors expressed the OB interneuron marker Er81, the neuroblast markers doublecortin (DC) and Distalless-related homeobox (DLX), or the oligodendrocyte progenitor marker Nkx2.2. In the rostral migratory stream (RMS), EGFP+ cells displayed a migrating phenotype. A fraction of these cells were either NG2-/Er81+/DC+/DLX+ or NG2+/Nkx2.2+. DiI (1,1'-dioctadecyl-3,3,3',3'-tetramethylindocarbocyanine perchlorate) injection into the lateral ventricle (LV) of early postnatal mice demonstrated that NG2+/EGFP+ progenitors migrate from the SVZ through the RMS into the OB. Moreover, fluorescence-activated cell-sorting-purified NG2+/CNP-EGFP+ or NG2+/ -actin-enhanced yellow fluorescent protein-positive (EYFP+) progenitors transplanted into the early postnatal LV displayed extensive rostral and caudal migration. EYFP+ or EGFP+ graft-derived cells within the RMS were DLX+/Er81+ or Nkx2.2+, migrated to the OB, and differentiated to interneurons and oligodendrocytes. In the subcortical white matter (SCWM), grafted cells differentiated to either oligodendrocytes or astrocytes. Transplantation of NG2+/EYFP+ progenitors selectively purified from the SVZ showed that these cells were migratory and generated glia and neurons in the OB, hippocampus, and striatum. In contrast, cortical, OB, or cerebellar NG2+ cells had a very limited migratory potential and gave rise to glia in the SCWM and striatum. Our findings indicate region-specific differences between NG2+ progenitor cells and show that NG2+ cells can migrate throughout the RMS and contribute to both gliogenesis and neurogenesis in the postnatal OB.
Key words: CNP-EGFP transgenic mice; neural progenitor; oligodendrocyte; interneuron; cell migration; rostral migratory stream
Received Aug 30, 2004;
revised October 11, 2004;
accepted October 14, 2004.
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