促进去甲肾上腺素传递可在静息时触发大脑网络的灵活重构。

Boosting Norepinephrine Transmission Triggers Flexible Reconfiguration of Brain Networks at Rest.

机构信息

ImpAct Team, Lyon Neuroscience Research Center, INSERM U1028, CNRS UMR5292, Lyon F-69000, France.

University UCBL Lyon 1, F-69000, France.

出版信息

Cereb Cortex. 2017 Oct 1;27(10):4691-4700. doi: 10.1093/cercor/bhw262.

Abstract

The locus coeruleus-norepinephrine (LC-NE) system is thought to act as a reset signal allowing brain network reorganization in response to salient information in the environment. However, no direct evidence of NE-dependent whole-brain reorganization has ever been described. We used resting-state functional magnetic resonance imaging in monkeys to investigate the impact of NE-reuptake inhibition on whole-brain connectivity patterns. We found that boosting NE transmission changes functional connectivity between and within resting-state networks. It modulated the functional connectivity pattern of a brainstem network including the LC region and interactions between associative and sensory-motor networks as well as within sensory-motor networks. Among the observed changes, those involving the fronto-parietal attention network exhibited a unique pattern of uncoupling with other sensory-motor networks and correlation switching from negative to positive with the brainstem network that included the LC nucleus. These findings provide the first empirical evidence of NE-dependent large-scale brain network reorganization and further demonstrate that the fronto-parietal attention network represents a central feature within this reorganization.

摘要

蓝斑-去甲肾上腺素(LC-NE)系统被认为是一种重置信号,可响应环境中的显著信息,从而促进大脑网络重组。然而,目前尚无直接证据表明去甲肾上腺素依赖性的全脑重组。我们使用猴子的静息态功能磁共振成像来研究去甲肾上腺素再摄取抑制对全脑连接模式的影响。我们发现,增强去甲肾上腺素传递会改变静息态网络之间和内部的功能连接。它调节了包括蓝斑区域在内的脑干网络的功能连接模式,以及联想和感觉运动网络之间以及感觉运动网络内部的相互作用。在观察到的变化中,涉及额顶注意网络的变化表现出与其他感觉运动网络的独特解耦模式,并且与包括蓝斑核在内的脑干网络的相关性从负相关切换为正相关。这些发现提供了去甲肾上腺素依赖性全脑网络重组的第一个经验证据,并进一步表明额顶注意网络是这种重组的核心特征之一。

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