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- W2039702961 abstract "Lithium was recently shown to inhibit apoptosis and promote survival of neural progenitor cells after hypoxia–ischemia in the immature rat brain. Our aim was to evaluate the effects of lithium on cell death and proliferation in the hippocampus after irradiation (IR) to the immature brain. Male mice were injected with 2 mmol/kg lithium chloride i.p. on postnatal day 9 (P9) and additional lithium injections, 1 mmol/kg, were administered at 24 h intervals for up to 7 days. BrdU was injected 4 h after lithium injections on P9 and P10. The left hemisphere received a single dose of 8 Gy (MV photons) on P11. The animals were euthanized 6 h or 7 weeks after IR. The number of BrdU-labeled cells in the subgranular zone (SGZ) of the granule cell layer (GCL) 6 h after IR was 24% higher in the lithium-treated mice. The number of proliferating, phospho-histone H3-positive cells in the SGZ 7 weeks after IR was 59% higher in the lithium group, so the effect was long-lasting. The number of apoptotic cells in the SGZ 6 h after IR was lower in the lithium group, as judged by 3 different parameters, pyknosis, staining for active caspase-3 and TUNEL. Newly formed cells (BrdU-labeled 1 or 2 days before IR) showed the greatest degree of protection, as judged by 50% fewer TUNEL-positive cells, whereas non-BrdU-labeled cells showed 38% fewer TUNEL-positive cells 6 h after IR. Consequently, the growth retardation of the GCL was less pronounced in the lithium group. The number and size of microglia in the DG were also lower in the lithium group, indicating reduced inflammation. Learning was facilitated after lithium treatment, as judged by improved context-dependent fear conditioning, and improved place learning, as judged by assessment in the IntelliCage platform. In summary, lithium administration could decrease IR-induced neural progenitor cell apoptosis in the GCL of the hippocampus and ameliorate learning impairments. It remains to be shown if lithium can be used to prevent the debilitating cognitive late effects seen in children treated with cranial radiotherapy." @default.
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- W2039702961 date "2012-08-01" @default.
- W2039702961 modified "2023-10-10" @default.
- W2039702961 title "Lithium reduced neural progenitor apoptosis in the hippocampus and ameliorated functional deficits after irradiation to the immature mouse brain" @default.
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- W2039702961 doi "https://doi.org/10.1016/j.mcn.2012.07.002" @default.
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- W2039702961 hasPublicationYear "2012" @default.
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