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Long-Range GABAergic Inputs Regulate Neural Stem Cell Quiescence and Control Adult Hippocampal Neurogenesis.
Cell Stem Cell ( IF 19.8 ) Pub Date : 2017-Nov-02 , DOI: 10.1016/j.stem.2017.10.003
Hechen Bao 1 , Brent Asrican 2 , Weidong Li 3 , Bin Gu 4 , Zhexing Wen 5 , Szu-Aun Lim 2 , Isaac Haniff 2 , Charu Ramakrishnan 6 , Karl Deisseroth 6 , Benjamin Philpot 7 , Juan Song 8
Affiliation  

The quiescence of adult neural stem cells (NSCs) is regulated by local parvalbumin (PV) interneurons within the dentate gyrus (DG). Little is known about how local PV interneurons communicate with distal brain regions to regulate NSCs and hippocampal neurogenesis. Here, we identify GABAergic projection neurons from the medial septum (MS) as the major afferents to dentate PV interneurons. Surprisingly, dentate PV interneurons are depolarized by GABA signaling, which is in sharp contrast to most mature neurons hyperpolarized by GABA. Functionally, these long-range GABAergic inputs are necessary and sufficient to maintain adult NSC quiescence and ablating them leads to NSC activation and subsequent depletion of the NSC pool. Taken together, these findings delineate a GABAergic network involving long-range GABAergic projection neurons and local PV interneurons that couples dynamic brain activity to the neurogenic niche in controlling NSC quiescence and hippocampal neurogenesis.

中文翻译:


长程 GABA 能输入调节神经干细胞静止并控制成人海马神经发生。



成体神经干细胞 (NSC) 的静止状态由齿状回 (DG) 内的局部小白蛋白 (PV) 中间神经元调节。关于局部 PV 中间神经元如何与远端大脑区域通信以调节 NSC 和海马神经发生,人们知之甚少。在这里,我们确定来自内侧隔膜 (MS) 的 GABA 能投射神经元是齿状 PV 中间神经元的主要传入神经元。令人惊讶的是,齿状 PV 中间神经元通过 GABA 信号传导去极化,这与大多数成熟神经元通过 GABA 超极化形成鲜明对比。从功能上讲,这些长程 GABA 能输入对于维持成体 NSC 静止是必要且充分的,消除它们会导致 NSC 激活和随后 NSC 库的耗尽。总而言之,这些发现描绘了一个涉及远程 GABA 能投射神经元和局部 PV 中间神经元的 GABA 能网络,该网络将动态大脑活动与控制 NSC 静止和海马神经发生的神经源性生态位耦合起来。
更新日期:2017-11-02
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