Delayed coupling to feedback inhibition during a critical period for the integration of adult-born granule cells.

Delayed coupling to feedback inhibition during a critical period for the integration of adult-born granule cells.
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DOI:
10.1016/j.neuron.2014.11.023
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发表时间:
2015-01-07
期刊:
影响因子:
16.2
通讯作者:
Schinder, Alejandro F.
Schinder, Alejandro F.
中科院分区:
医学1区
文献类型:
--
作者:
Temprana, Silvio G.;Mongiat, Lucas A.;Yang, Sung M.;Trinchero, Mariela F.;Alvarez, Diego D.;Kropff, Emilio;Giacomini, Damiana;Beltramone, Natalia;Lanuza, Guillermo M.;Schinder, Alejandro F.

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发育中的齿状回颗粒细胞(GCs)在成熟之前经历了一个增强活性和突触可塑性的关键时期。发展中的GCs对先前存在的齿状回路活动的影响尚不清楚。在这里,我们结合光遗传学、急性切片电生理学和体内化学遗传学来激活不同成熟阶段的GCs,以研究局部目标网络的募集。我们发现,未成熟(4周大)的GCs可以有效地驱动远端CA3靶标,但激活负责反馈抑制(FBI)的近端中间神经元的能力较差。随着新的GCs向成熟过渡,它们可靠地招募gaba能反馈回路,限制邻近GCs的尖峰,这是一种促进稀疏编码的机制。这种抑制回路仅在年轻GCs的新队列中产生微弱的影响。一个计算模型显示,新的GCs与FBI的延迟耦合对于在齿状回中实现新输入的细粒度表示至关重要。
Developing granule cells (GCs) of the adult dentate gyrus undergo a critical period of enhanced activity and synaptic plasticity before becoming mature. The impact of developing GCs on the activity of preexisting dentate circuits remains unknown. Here we combine optogenetics, acute slice electrophysiology, and in vivo chemogenetics to activate GCs at different stages of maturation to study the recruitment of local target networks. We show that immature (four-week-old) GCs can efficiently drive distal CA3 targets, but poorly activate proximal interneurons responsible for feedback inhibition (FBI). As new GCs transition towards maturity, they reliably recruit GABAergic feedback loops that restrict spiking of neighbor GCs, a mechanism that would promote sparse coding. Such inhibitory loop impinges only weakly in new cohorts of young GCs. A computational model reveals that the delayed coupling of new GCs to FBI could be crucial to achieve a fine-grain representation of novel inputs in the dentate gyrus.
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