Investigation of the effective connectivity between the anti-NMDAR encephalitis default mode network and the medial temporal lobe network using spectral dynamic causal modelling.

IF 2.4 3区 医学 Q2 NEUROIMAGING
Zijun Liu, Muzi Li, Jingwen Li, Guang Xu, Junzhang Tian, Xiaofen Ma
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引用次数: 0

Abstract

Background: Research has indicated that anti-N-methyl-d-aspartate receptor (anti-NMDAR) encephalitis involves global network dysfunction, linking memory deficits to connectivity in the hippocampus, default mode network (DMN), and medial temporal lobe network (MTL). Most relevant cognitive studies have focused on functional connectivity (FC) rather than effective connectivity (EC), meaning that the directed interactions and causal relationships between the DMN and MTL remain unexplored.

Methods: Herein, we collected resting-state functional MRI (fMRI) data from 23 patients with anti-NMDAR encephalitis (mean age 30.04 ± 12.67 years) and 23 matched controls (mean age 28.87 ± 9.36 years). Spectral dynamic causal modelling (spDCM) was applied to assess the effective connectivity among the 12 predefined regions of interest in the DMN and MTL.

Results: Effective connectivity (EC) within and between the DMN and MTL networks significantly differed in the NMDAR-resistant encephalitis group compared to controls; the positive EC within the DMN and from the MTL to the DMN was enhanced, while the negative EC from the DMN to the MTL increased, and the positive EC within the MTL decreased. The mean DMN connectivity values in the anti-NMDAR group were negatively correlated with California Verbal Learning Test (CVLT) and Modified Mental State Examination (MMSE) scores, an effect which remained significant after adjusting for age, sex, and body mass index.

Conclusion: This study identified differences in the connectivity between the DMN and MTL networks in patients with post-acute anti-NMDAR encephalitis, suggesting a possible disconnection. The parahippocampal gyrus (PHG) mediates connections between the hippocampus and the posterior cingulate cortex (PCC). Structural or functional loss of the PHG may affect the integration between the MTL memory system and DMN nodes, correlating with cognitive deficits. This study provides crucial results to improve our understanding of the directed integration between the DMN and MTL networks, providing new evidence.

利用谱动态因果模型研究抗nmdar脑炎默认模式网络与内侧颞叶网络之间的有效连通性。
背景:研究表明,抗n -甲基-d-天冬氨酸受体(anti-NMDAR)脑炎涉及全局网络功能障碍,将记忆缺陷与海马、默认模式网络(DMN)和内侧颞叶网络(MTL)的连通性联系起来。大多数相关的认知研究都集中在功能连通性(FC)而不是有效连通性(EC)上,这意味着DMN和MTL之间的直接相互作用和因果关系仍未被探索。方法:收集23例抗nmdar脑炎患者(平均年龄30.04±12.67岁)和23例匹配对照组(平均年龄28.87±9.36岁)的静息态功能MRI (fMRI)数据。应用谱动态因果模型(spDCM)评估DMN和MTL中12个预定义感兴趣区域之间的有效连通性。结果:与对照组相比,nmdar耐药脑炎组DMN和MTL网络内部和之间的有效连通性(EC)显著不同;DMN内和MTL至DMN的正态EC增强,DMN至MTL的负态EC增强,MTL内的正态EC降低。抗nmdar组的平均DMN连通性值与加州言语学习测验(CVLT)和修正精神状态检查(MMSE)得分呈负相关,在调整年龄、性别和体重指数后,这一效应仍然显著。结论:本研究发现急性抗nmdar脑炎患者DMN和MTL网络之间的连通性存在差异,提示可能存在连接断开。海马旁回(PHG)介导海马和后扣带皮层(PCC)之间的联系。PHG的结构或功能丧失可能影响MTL记忆系统和DMN节点之间的整合,与认知缺陷相关。这项研究提供了重要的结果,以提高我们对DMN和MTL网络之间定向整合的理解,提供了新的证据。
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来源期刊
Brain Imaging and Behavior
Brain Imaging and Behavior 医学-神经成像
CiteScore
7.20
自引率
0.00%
发文量
154
审稿时长
3 months
期刊介绍: Brain Imaging and Behavior is a bi-monthly, peer-reviewed journal, that publishes clinically relevant research using neuroimaging approaches to enhance our understanding of disorders of higher brain function. The journal is targeted at clinicians and researchers in fields concerned with human brain-behavior relationships, such as neuropsychology, psychiatry, neurology, neurosurgery, rehabilitation, and cognitive neuroscience.
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