前额叶皮质
心理学
扣带回前部
神经科学
部分各向异性
腹侧纹状体
默认模式网络
神经可塑性
扁桃形结构
功能磁共振成像
扣带皮质
慢性应激
白质
医学
纹状体
磁共振成像
中枢神经系统
认知
多巴胺
放射科
作者
Joanes Grandjean,Damiano Azzinnari,Aline Seuwen,Hannes Sigrist,Erich Seifritz,Christopher R. Pryce,Markus Rudin
出处
期刊:NeuroImage
[Elsevier]
日期:2016-11-01
卷期号:142: 544-552
被引量:79
标识
DOI:10.1016/j.neuroimage.2016.08.013
摘要
Human depression, for which chronic psychosocial stress is a major risk factor, is characterized by consistent alterations in neurocircuitry. For example, there is increased functional connectivity (FC) within and between regions comprising the default mode network (DMN) including prefrontal cortex and cingulate cortex. Alterations in network FC are associated with specific aspects of psychopathology. In mice, chronic psychosocial stress (CPS) leads to depression-relevant behavior, including increased fear learning, learned helplessness, fatigue and decreased motivation for reward. Using multimodal in vivo magnetic resonance imaging (MRI) and spectroscopy (MRS), we investigated CPS effects on function and structure in the mouse brain under light anesthesia. Mice underwent a baseline MRI/MRS session, followed by 15-day CPS (n=26) or control handling (n=27), and a post-treatment MRI/MRS session. In BOLD fMRI, relative to controls, CPS mice exhibited robust, reproducible increases in FC within 8 of 9 identified cortical networks, including the prefrontal and cingulate cortices that contribute to the "mouse DMN". CPS mice exhibited increases in between-network FC, including amygdala - prefrontal cortex and amygdala - cingulate cortex. MRS identified metabolic alterations in CPS mice as increased inositol levels in amygdala and increased glycerophosphorylcholine levels in prefrontal cortex. Diffusion-weighted MRI detected increased fractional anisotropic values in the cingulum. This study demonstrates that chronic psychosocial stress induces FC states in the mouse brain analogous to those observed in depression, as well as cerebral metabolism and white matter pathway alterations that contribute to understanding of pathological processes. It also demonstrates the importance of brain imaging to the establishment of valid animal models in translational psychiatry.
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