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• W3023442851 abstract "Abstract Background Although historically microglia were thought to be immature in the fetal brain, evidence of purposeful interactions between these immune cells and nearby neural progenitors is becoming established. Here, we examined the influence of embryonic microglia on gliogenesis within the developing tuberal hypothalamus, a region later important for energy balance, reproduction, and thermoregulation. Methods We used immunohistochemistry to quantify the location and numbers of glial cells in the embryonic brain (E13.5–E17.5), as well as a pharmacological approach (i.e., PLX5622) to knock down fetal microglia. We also conducted cytokine and chemokine analyses on embryonic brains in the presence or absence of microglia, and a neurosphere assay to test the effects of the altered cytokines on hypothalamic progenitor behaviors. Results We identified a subpopulation of activated microglia that congregated adjacent to the third ventricle alongside embryonic Olig2+ neural progenitor cells (NPCs) that are destined to give rise to oligodendrocyte and astrocyte populations. In the absence of microglia, we observed an increase in Olig2+ glial progenitor cells that remained at the ventricle by E17.5 and a concomitant decrease of these Olig2+ cells in the mantle zone, indicative of a delay in migration of these precursor cells. A further examination of maturing oligodendrocytes in the hypothalamic grey and white matter area in the absence of microglia revealed migrating oligodendrocyte progenitor cells (OPCs) within the grey matter at E17.5, a time point when OPCs begin to slow their migration. Finally, quantification of cytokine and chemokine signaling in ex vivo E15.5 hypothalamic cultures +/− microglia revealed decreases in the protein levels of several cytokines in the absence of microglia. We assayed the influence of two downregulated cytokines (CCL2 and CXCL10) on neurosphere-forming capacity and lineage commitment of hypothalamic NPCs in culture and showed an increase in NPC proliferation as well as neuronal and oligodendrocyte differentiation. Conclusion These data demonstrate that microglia influence gliogenesis in the developing tuberal hypothalamus." @default.
• W3023442851 created "2020-05-13" @default.
• W3023442851 creator A5011878659 @default.
• W3023442851 creator A5015274291 @default.
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• W3023442851 creator A5039858998 @default.
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• W3023442851 creator A5082463164 @default.
• W3023442851 date "2020-05-06" @default.
• W3023442851 modified "2023-10-11" @default.
• W3023442851 title "Embryonic microglia influence developing hypothalamic glial populations" @default.
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• W3023442851 doi "https://doi.org/10.1186/s12974-020-01811-7" @default.
• W3023442851 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7201702" @default.

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