ORIGINAL RESEARCH article
Front. Neurosci.
Sec. Translational Neuroscience
Voxel-based morphometry and functional connectivity changes are associated with cognitive function in herpes simplex virus encephalitis
Provisionally accepted
- 1Intensive Care Unit, QuZhou KeCheng People‘s Hospital, Quzhou, China
- 2The People's Hospital of Pingyang, Wenzhou, China
- 3The First Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, China
- 4The Second People's Hospital of Quzhou, Quzhou, China
- 5QuZhou KeCheng People‘s Hospital, Quzhou, China
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PURPOSE: Herpes simplex encephalitis (HSE) is a severe neurological condition associated with significant cognitive impairment and structural brain changes. This study aimed to investigate microstructural and functional connectivity (FC) alterations in HSE patients and their association with cognitive function, cerebrospinal fluid (CSF) parameters, and inflammatory markers. METHODS: A single-center cohort study was conducted with 73 HSE patients and 76 cognitively unimpaired controls. Voxel-based morphometry (VBM) and resting-state functional MRI ( rs-fMRI) ) were used to assess VBM grey matter volume (GMV) and FC. Cognitive function was evaluated using the Montreal Cognitive Assessment (MoCA). CSF pressure, protein levels, and proinflammatory cytokines (IL-6, IL-1β, IL-2, IL-4, IL-5, IL-10) were measured. Statistical analyses included group comparisons and multivariable regression adjusted for age, gender, and hypertension. RESULTS: HSE patients exhibited significant GMV reductions in the right hippocampal gyrus, left precuneus, and left posterior cingulate gyrus (all p < 0.001). Enhanced FC was observed between the left hippocampus and medial prefrontal cortex (mPFC), while weakened connectivity was noted between the left precuneus, posterior cingulate gyrus, and mPFC in controls. Cognitive scores (MoCA) were lower in HSE patients (p < 0.001) and positively correlated with GMV and FC metrics (p < 0.05). Elevated CSF pressure, protein, and proinflammatory cytokines (particularly IL-6) were negatively associated with cerebral metrics (p < 0.001). A significant interaction between IL-6 and cerebral metrics further influenced cognitive outcomes (p < 0.05). CONCLUSIONS: HSE is associated with distinct microstructural and functional connectivity changes that are correlated with cognitive impairment and neuroinflammation. Our findings suggest a potential interaction between IL-6 levels, cerebral alterations, and cognitive dysfunction, which may inform the exploration of neuroimaging and inflammatory biomarkers in personalized therapeutic strategies. However, these represent observational associations, and further prospective studies are needed to validate these findings and establish causal relationships.
Keywords: cognitive impairment, functional connectivity, Herpes simplex encephalitis, Interleukin-6, Neuroinflammation, voxel-based morphometry
Received: 06 Oct 2025; Accepted: 08 Dec 2025.
Copyright: © 2025 Feng, Li, Xu, Xu, Yan, Lan and Zhu. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: Xiaofen Zhu
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