Repopulated microglia are solely derived from the proliferation of residual microglia after acute depletion
- PMID: 29472620
- DOI: 10.1038/s41593-018-0090-8
Repopulated microglia are solely derived from the proliferation of residual microglia after acute depletion
Erratum in
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Author Correction: Repopulated microglia are solely derived from the proliferation of residual microglia after acute depletion.Nat Neurosci. 2021 Feb;24(2):288. doi: 10.1038/s41593-020-00760-x. Nat Neurosci. 2021. PMID: 33219354 No abstract available.
Abstract
Newborn microglia rapidly replenish the whole brain after selective elimination of most microglia (>99%) in adult mice. Previous studies reported that repopulated microglia were largely derived from microglial progenitor cells expressing nestin in the brain. However, the origin of these repopulated microglia has been hotly debated. In this study, we investigated the origin of repopulated microglia by a series of fate-mapping approaches. We first excluded the blood origin of repopulated microglia via parabiosis. With different transgenic mouse lines, we then demonstrated that all repopulated microglia were derived from the proliferation of the few surviving microglia (<1%). Despite a transient pattern of nestin expression in newly forming microglia, none of repopulated microglia were derived from nestin-positive non-microglial cells. In summary, we conclude that repopulated microglia are solely derived from residual microglia rather than de novo progenitors, suggesting the absence of microglial progenitor cells in the adult brain.
Comment in
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Microglia's heretical self-renewal.Nat Neurosci. 2018 Apr;21(4):455-456. doi: 10.1038/s41593-018-0123-3. Nat Neurosci. 2018. PMID: 29593318 No abstract available.
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