Unique processing during a period of high excitation/inhibition balance in adult-born neurons.

Unique processing during a period of high excitation/inhibition balance in adult-born neurons.
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DOI:
10.1126/science.1214956
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发表时间:
2012-03-09
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Schinder AF
Schinder AF
中科院分区:
其他
文献类型:
--
作者:
Marín-Burgin A;Mongiat LA;Pardi MB;Schinder AF

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成年齿状回产生新的颗粒细胞(GC),这些细胞在几周内发育并整合到先前存在的网络中。虽然成年海马神经发生与学习和记忆有关,但新GC的具体作用仍不清楚。我们研究了未成熟的成人出生的神经元是否有助于信息编码。结合钙成像和电生理学在急性切片中,我们发现,弱传入活动招募几个成熟的GC,而激活相当大比例的未成熟的神经元。这些不同的激活阈值由未成熟GC中瞬时表达的增强的兴奋/抑制平衡决定。未成熟的GC表现出低输入特异性,其随着时间的推移而向高度特异性的响应性转变。因此,进入齿状回的活动模式可以通过起源于不同时间的异质性GC群体进行差异解码。
The adult dentate gyrus generates new granule cells (GCs) that develop over several weeks and integrate into the preexisting network. While adult hippocampal neurogenesis has been implicated in learning and memory, the specific role of new GCs remains unclear. We examined whether immature adult-born neurons contribute to information encoding. Combining calcium imaging and electrophysiology in acute slices we found that weak afferent activity recruits few mature GCs while activating a substantial proportion of the immature neurons. These different activation thresholds are dictated by an enhanced excitation/inhibition balance transiently expressed in immature GCs. Immature GCs exhibit low input specificity that switches with time towards a highly specific responsiveness. Therefore, activity patterns entering the dentate gyrus can undergo differential decoding by a heterogeneous population of GCs originated at different times.
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