Progenitors in the adult cerebral cortex: Cell cycle properties and regulation by physiological stimuli and injury
Top Cited Papers
- 28 March 2011
- Vol. 59 (6), 869-881
- https://doi.org/10.1002/glia.21156
Abstract
The adult brain parenchyma contains a widespread population of progenitors generating different cells of the oligodendrocyte lineage such as NG2+ cells and some mature oligodendrocytes. However, it is still largely unknown how proliferation and lineage decisions of these progenitors are regulated. Here, we first characterized the cell cycle length, proliferative fraction, and progeny of dividing cells in the adult cerebral cortex and then compared these proliferation characteristics after two distinct stimuli, invasive acute brain injury and increased physiological activity by voluntary physical exercise. Our data show that adult parenchymal progenitors have a very long cell cycle due to an extended G1 phase, many of them can divide at least twice and only a limited proportion of the progeny differentiates into mature oligodendrocytes. After stab wound injury, however, many of these progenitors re‐enter the cell cycle very fast, suggesting that the normally long G1 phase is subject to regulation and can be abruptly shortened. In striking contrast, voluntary physical exercise shows the opposite effect with increased exit of the cell cycle followed by an enhanced and fast differentiation into mature oligodendrocytes. Taken together, our data demonstrate that the endogenous population of adult brain parenchymal progenitors is subject to profound modulation by environmental stimuli in both directions, either faster proliferation or faster differentiation.Keywords
This publication has 69 references indexed in Scilit:
- NG2+ CNS Glial Progenitors Remain Committed to the Oligodendrocyte Lineage in Postnatal Life and following NeurodegenerationNeuron, 2010
- Voluntary Exercise Increases Oligodendrogenesis in Spinal CordInternational Journal of Neuroscience, 2010
- Attenuation of proliferation in oligodendrocyte precursor cells by activated microgliaJournal of Neuroscience Research, 2010
- NG2 cells: Properties, progeny and originBrain Research Reviews, 2010
- Inhibition of CXCR2 signaling promotes recovery in models of multiple sclerosisExperimental Neurology, 2009
- The principal neurons of the medial nucleus of the trapezoid body and NG2+ glial cells receive coordinated excitatory synaptic inputThe Journal of general physiology, 2009
- Origin and progeny of reactive gliosis: A source of multipotent cells in the injured brainProceedings of the National Academy of Sciences of the United States of America, 2008
- Spiking and nonspiking classes of oligodendrocyte precursor glia in CNS white matterNature Neuroscience, 2008
- Long-Term Impact of Radiation on the Stem Cell and Oligodendrocyte Precursors in the BrainPLOS ONE, 2007
- Synaptic signaling between GABAergic interneurons and oligodendrocyte precursor cells in the hippocampusNature Neuroscience, 2003