Active cortical networks promote shunting fast synaptic inhibition in vivo
Active cortical networks promote shunting fast synaptic inhibition in vivo
复制标题
活跃的皮质网络促进体内快速分流突触抑制
DOI:
10.1101/2023.03.01.530641
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发表时间:
2023
期刊:
影响因子:
--
通讯作者:
Burman R
中科院分区:
文献类型:
--
作者:
Burman R
Fast synaptic inhibition determines neuronal response properties in the mammalian brain and is mediated by chloride-permeable ionotropic GABA-A receptors (GABAARs). Despite their fundamental role, it is still not known how GABAARs signal in the intact brain. Here, we usein vivogramicidin recordings to investigate synaptic GABAAR signaling in mouse cortical pyramidal neurons under conditions that preserve native transmembrane chloride gradients. In anesthetized cortex, synaptic GABAARs exert classic hyperpolarizing effects. In contrast, GABAAR-mediated synaptic signaling in awake cortex is found to be predominantly shunting. This is due to more depolarized GABAAR equilibrium potentials (EGABAAR), which are shown to result from the high levels of synaptic activity that characterize awake cortical networks. Synaptic EGABAARobserved in awake cortex facilitates the desynchronizing effects of inhibitory inputs upon local networks, which increases the flexibility of spiking responses to external inputs. Our findings therefore suggest that GABAAR signaling adapts to optimize cortical functions.
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DOI:
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发表时间:
2008
期刊:
影响因子:
--
作者:
Kitamura;K.
通讯作者:
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影响因子:
2.5
作者:
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通讯作者:
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2013
期刊:
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影响因子:
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作者:
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影响因子:
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通讯作者:
Lindsley, Craig W.