齿状回
神经干细胞
神经发生
神经科学
信号转导
细胞生物学
海马体
MAPK/ERK通路
生物
PI3K/AKT/mTOR通路
神经营养因子
干细胞
受体
生物化学
作者
Seokhwi Kim,Nury Kim,Jinsu Lee,Sungsoo Kim,Jongryul Hong,Seungkyu Son,Seokhwi Kim
出处
期刊:Science Advances
[American Association for the Advancement of Science (AAAS)]
日期:2020-04-24
卷期号:6 (17)
被引量:13
标识
DOI:10.1126/sciadv.aaz9691
摘要
Activation of Fas (CD95) is observed in various neurological disorders and can lead to both apoptosis and prosurvival outputs, yet how Fas signaling operates dynamically in the hippocampus is poorly understood. The optogenetic dissection of a signaling network can yield molecular-level explanations for cellular responses or fates, including the signaling dysfunctions seen in numerous diseases. Here, we developed an optogenetically activatable Fas that works in a physiologically plausible manner. Fas activation in immature neurons of the dentate gyrus triggered mammalian target of rapamycin (mTOR) activation and subsequent brain-derived neurotrophic factor secretion. Phosphorylation of extracellular signal-regulated kinase (Erk) in neural stem cells was induced under prolonged Fas activation. Repetitive activation of this signaling network yielded proliferation of neural stem cells and a transient increase in spatial working memory in mice. Our results demonstrate a novel Fas signaling network in the dentate gyrus and illuminate its consequences for adult neurogenesis and memory enhancement.
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