Abstract
Adult mammalian neurogenesis occurs in the hippocampus and the olfactory bulb, whereas neocortical adult neurogenesis remains controversial. Several occurrences of neocortical adult neurogenesis in injured neocortex were recently reported, suggesting that neural stem cells (NSCs) or neuronal progenitor cells (NPCs) that can be activated by injury are maintained in the adult brain. However, it is not clear whether or where neocortical NSCs/NPCs exist in the brain. We found NPCs in the neocortical layer 1 of adult rats and observed that their proliferation was highly activated by global forebrain ischemia. Using retrovirus-mediated labeling of layer 1 proliferating cells with membrane-targeted green fluorescent protein, we found that the newly generated neurons were GABAergic and that the neurons were functionally integrated into the neuronal circuitry. Our results suggest that layer 1 NPCs are a source of adult neurogenesis under ischemic conditions.
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Acknowledgements
We would like to thank T.J. Hope for a kindly gift of WPRE, and K. Takumi, M. Itoh, T. Kunieda and H. Kameda for their experimental support. This work was supported by Grants-in-Aid from the Ministry of Education, Culture, Sports, Science and Technology (K.O., T.F., H.H., K.C.N., T.M., T.K. and S.N.) and the Organization for Pharmaceutical Safety and Research (S.N.), by the Cooperation Research Program of Primate Research Institute of Kyoto University (K.O.) and by the Core Research for Evolutional Science and Technology of Japan Science and Technology Agency (K.O., K.C.N., T.M., T.K. and S.N.).
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K.O. designed and performed most of the experiments and co-wrote the paper. T.F. and H.H. made the pBS-CMV-Fyn-GFP-WPRE and pENT-Synapsin I-Fyn-GFP-WPRE plasmids. K.C.N. made guinea pig and rabbit antibodies to GFP. E.K., Y.T., N.F., K.S., T.O., M.H. and T.M. supported the experiments. T.K. and S.N. co-wrote the paper. All authors discussed the results and commented on the manuscript.
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Ohira, K., Furuta, T., Hioki, H. et al. Ischemia-induced neurogenesis of neocortical layer 1 progenitor cells. Nat Neurosci 13, 173–179 (2010). https://doi.org/10.1038/nn.2473
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DOI: https://doi.org/10.1038/nn.2473
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