Modulating Neuronal Competition Dynamics in the Dentate Gyrus to Rejuvenate Aging Memory Circuits.

Modulating Neuronal Competition Dynamics in the Dentate Gyrus to Rejuvenate Aging Memory Circuits.
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DOI:
10.1016/j.neuron.2016.08.009
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发表时间:
2016-09-21
期刊:
影响因子:
16.2
通讯作者:
Sahay A
Sahay A
中科院分区:
医学1区
文献类型:
--
作者:
McAvoy KM;Scobie KN;Berger S;Russo C;Guo N;Decharatanachart P;Vega-Ramirez H;Miake-Lye S;Whalen M;Nelson M;Bergami M;Bartsch D;Hen R;Berninger B;Sahay A

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成年齿状核颗粒细胞(DGC)的整合和功能的神经回路机制尚不清楚。成人出生的DGC被认为与成熟的DGC竞争整合的输入。树突棘的负调节因子Kruppel样因子9(Klf9)在成熟DGC中的瞬时遗传过表达增强了成年DGC的整合,并增加了NSC的激活。在成熟的DGC中抑制Klf9过表达恢复了棘、活性,并重置了神经元竞争动力学和NSC活化,使DG被功能整合的、扩展的年龄匹配的成年出生的DGC队列修饰。在成熟的DGC中通过Rac 1的诱导性缺失来消除脊柱增加了成年出生的DGC的存活,而不影响增殖或DGC活性。增强成人出生的DGC的整合瞬时重组成人出生的DGC局部传入连接,促进全球重新映射的DG。通过增强成年、中年和衰老时成年出生的DGC的整合来使DG恢复活力,从而增强记忆精度。
The neural circuit mechanisms underlying the integration and functions of adult-born dentate granule cell (DGCs) are poorly understood. Adult-born DGCs are thought to compete with mature DGCs for inputs to integrate. Transient genetic overexpression of a negative regulator of dendritic spines, Kruppel-like factor 9 (Klf9), in mature DGCs enhanced integration of adult-born DGCs and increased NSC activation. Reversal of Klf9 overexpression in mature DGCs restored spines, activity, and reset neuronal competition dynamics and NSC activation, leaving the DG modified by a functionally integrated, expanded cohort of age-matched adult-born DGCs. Spine elimination by inducible deletion of Rac1 in mature DGCs increased survival of adult-born DGCs without affecting proliferation or DGC activity. Enhanced integration of adult-born DGCs transiently reorganized adult-born DGC local afferent connectivity and promoted global remapping in the DG. Rejuvenation of the DG by enhancing integration of adult-born DGCs in adulthood, middle age and aging enhanced memory precision.
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