New GABAergic interneurons in the adult neocortex and striatum are generated from different precursors

Dayer, Alexandre; Cleaver, Kathryn M.; Abouantoun, Thamara J.; Cameron, Heather A.

doi:10.1083/jcb.200407053

Cited by 417 publications

(434 citation statements)

References 60 publications

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“…NG2 + cells have been found both in the SVZ and hippocampus, and analysis of their developmental potential has demonstrated that they are not only a source of oligodendrocytes (OLs), but also have neurogenic properties Dayer et al, 2005;Ohori et al, 2006;Rogelious et al, 2006;Tamura et al, 2007).…”

Section: Discussionmentioning

confidence: 99%

Reduced EGFR signaling in progenitor cells of the adult subventricular zone attenuates oligodendrogenesis after demyelination

Aguirre

Gallo

2007

Neuron Glia Biol.

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Neural progenitor cells expressing the NG2 proteoglycan are found in different regions of the adult mammalian brain, where they display distinct morphologies and proliferative rates. In the developing postnatal and adult mouse, NG2 + cells represent a major cell population of the subventricular zone (SVZ). NG2 + cells divide in the anterior and lateral region of the SVZ, and are stimulated to proliferate and migrate out of the SVZ by focal demyelination of the corpus callosum (CC). Many NG2 + cells are labeled by GFP-retrovirus injection into the adult SVZ, demonstrating that NG2 + cells actively proliferate under physiological conditions and after demyelination. In the wa2 mouse, which is characterized by reduced EGFR signaling, NG2 + cell proliferation, under normal physiological conditions and after focal demyelination, is significantly attenuated. This results in reduced SVZ-to-lesion migration of NG2 + cells and oligodendrogenesis in the lesion. Expression of VEGF and EGFR ligands, such as HB-EGF and TGF-alpha, is upregulated in the SVZ after focal demyelination of the CC. EGF-induced oligodendrogenesis and myelin protein expression in cultured wild-type SVZ cells were significantly attenuated in wa2 SVZ cells. Our results demonstrate that the NG2 + cell response in the SVZ and their subsequent differentiation in CC after focal demyelination are dependent upon EGFR signaling.

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Section: Discussionmentioning

confidence: 99%

Reduced EGFR signaling in progenitor cells of the adult subventricular zone attenuates oligodendrogenesis after demyelination

Aguirre

Gallo

2007

Neuron Glia Biol.

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“…In the present study, we could not observe any newborn cells in the neocortex that acquired a neuronal phenotype. Our failure to find any newborn neurons in the mPFC might be due to the fact that we employed a significantly different BrdU-labeling protocol compared with that of Dayer et al (2005), who injected much more BrdU and used longer survival times. A more systematic analysis using different BrdU-labeling protocols, survival times and various interneuronal markers may reveal that a small subset of the newly generated cells affected by stress and antidepressant treatment could be GABAergic neurons.…”

Section: Phenotypic Analysis Of the Newborn Cellsmentioning

confidence: 99%

“…The presence of newborn neurons has been reported in various neocortical areas of adult nonhuman primates (Gould et al, 1999(Gould et al, , 2001Bernier et al, 2002), but these findings have not been replicated by other investigators (Kornack and Rakic, 2001). Interestingly, a recent study came to the conclusion that GABAergic interneurons are generated in the neocortex of adult rats (Dayer et al, 2005).…”

Section: Phenotypic Analysis Of the Newborn Cellsmentioning

confidence: 99%

Chronic Social Stress Inhibits Cell Proliferation in the Adult Medial Prefrontal Cortex: Hemispheric Asymmetry and Reversal by Fluoxetine Treatment

Czéh

Müller-Keuker

Ryguła

et al. 2006

Neuropsychopharmacol

317

221

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Profound neuroplastic changes have been demonstrated in various limbic structures after chronic stress exposure and antidepressant treatment in animal models of mood disorders. Here, we examined in rats the effect of chronic social stress and concomitant antidepressant treatment on cell proliferation in the medial prefrontal cortex (mPFC). We also examined possible hemispheric differences. Animals were subjected to 5 weeks of daily social defeat by an aggressive conspecific and received concomitant, daily, oral fluoxetine (10 mg/kg) during the last 4 weeks. Bromodeoxyuridine (BrdU) labeling and quantitative stereological techniques were used to evaluate the treatment effects on proliferation and survival of newborn cells in limbic structures such as the mPFC and the hippocampal dentate gyrus, in comparison with nonlimbic structures such as the primary motor cortex and the subventricular zone. Phenotypic analysis showed that neurogenesis dominated the dentate gyrus, whereas in the mPFC most newborn cells were glia, with smaller numbers of endothelial cells. Chronic stress significantly suppressed cytogenesis in the mPFC and neurogenesis in the dentate gyrus, but had minor effect in nonlimbic structures. Fluoxetine treatment counteracted the inhibitory effect of stress. Hemispheric comparison revealed that the rate of cytogenesis was significantly higher in the left mPFC of control animals, whereas stress inverted this asymmetry, yielding a significantly higher incidence of newborn cells in the right mPFC. Fluoxetine treatment abolished hemispheric asymmetry in both control and stressed animals. These pronounced changes in gliogenesis after chronic stress exposure may relate to the abnormalities of glial cell numbers reported in the frontolimbic areas of depressed patients.

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“…The two primary zones of adult proliferation are the subgranular layer of the hippocampal dentate gyrus and the SVZ of the forebrain, although other zones are also thought to exist 51,52 . DCX has become a widely used marker for newly generated neuroblasts in proliferative zones in adult 14,31,53,54 .…”

Section: Role Of DCX In the Rmsmentioning

confidence: 99%

Doublecortin maintains bipolar shape and nuclear translocation during migration in the adult forebrain

et al. 2006

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The ability of the mature mammalian nervous system to continually produce neuronal precursors is of considerable importance, as manipulation of this process might one day permit the replacement of cells lost as a result of injury or disease. In mammals, the anterior subventricular zone (SVZa) region is one of the primary sites of adult neurogenesis. Here we show that Doublecortin (DCX), a widely used marker for newly generated neurons, when deleted in mouse results in a severe morphological defect in the rostral migratory stream and delayed neuronal migration that is independent of direction or responsiveness to Slit chemorepulsion. DCX is required for nuclear translocation and maintenance of bipolar morphology during migration of these cells. Our data identifies a critical function for DCX in the movement of newly generated neurons in the adult brain.In the rodent and primate brain, the anterior region of the lateral ventricle and the hippocampus are the primary sites of adult neurogenesis [1][2][3][4][5][6][7] . These neuroblasts, upon completing migration, are capable of maturing into fully differentiated neurons, integrating into local synaptic circuits and may be important in adult cognitive processing [8][9][10][11] .The mechanisms controlling the targeted translocation of large numbers of cells to the olfactory bulb (OB) over a considerable distance (>5 mm in the adult mouse) are an issue of intense investigation. These neurons translocate using a process known as chain migration, whereby the cells use each other as the migratory substrate 12 . These newly generated neurons are derived from SVZa glial fibrillary acidic protein (GFAP)-positive astrocytes 13,14 , which also ensheath them as they move through extensive interconnected networks along the lining of the lateral ventricle in the rostral forebrain and the rostral migratory stream (RMS) 15 . There, they are under the control of extracellular migration guidance cues, including the secreted ligands Slit and Reelin [16][17][18][19] , the receptors ErbB4 and Deleted in Colorectal Carcinoma (DCC) 20,21 , as well as integrins and neural cell adhesion molecule [21][22][23] . Upon reaching the bulb, the neurons turn and migrate in a radial direction 24 , integrating into either the granule cell layer or the periglomerular network 25 . 3The X-linked gene doublecortin (DCX) is mutated in some patients with the severe neuronal migration defect called classical lissencephaly or double cortex syndrome 26,27 . This migration defect is likely to be cell autonomous, because in females with a heterozygous mutation, approximately half of the neurons are misplaced within the cerebral cortex as would be expected from random X-chromosome inactivation. As a result, males display a four-layered agyric cortex and females display a subcortical band of heterotopic neurons. It was surprising, therefore, that the Dcx knockout mice displayed no appreciable defect in cortical neuronal lamination or positioning 28 . One possible explanation for these species differences ...

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New GABAergic interneurons in the adult neocortex and striatum are generated from different precursors

Cited by 417 publications

References 60 publications

Reduced EGFR signaling in progenitor cells of the adult subventricular zone attenuates oligodendrogenesis after demyelination

Reduced EGFR signaling in progenitor cells of the adult subventricular zone attenuates oligodendrogenesis after demyelination

Chronic Social Stress Inhibits Cell Proliferation in the Adult Medial Prefrontal Cortex: Hemispheric Asymmetry and Reversal by Fluoxetine Treatment

Doublecortin maintains bipolar shape and nuclear translocation during migration in the adult forebrain

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