Increased grey matter volume and associated resting-state functional connectivity in chronic spontaneous urticaria: A structural and functional MRI study - 03/06/21
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Graphical abstract |
Highlights |
• | The first investigation on changes in brain structure and the associated functional circuitry in CSU. |
• | Grey matter volume of the right premotor cortex, left fusiform cortex, and cerebellum increased in CSU. |
• | The brain structural changes in CSU not only affect the sensorimotor area but also cognitive function. |
• | The mapping of neural networks activated by chronic itch sensations can aid the development of future therapeutics. |
Abstract |
Background and purpose |
Chronic itch is one of the most common irritating sensations, yet its mechanisms have not been fully elucidated. Although some studies have revealed relationships between itching and brain function, the structural changes in the brain induced by chronic itching, such as those accompanying chronic spontaneous urticaria (CSU), remain unclear. In this study, we aimed to explore the potential changes in brain structure and the associated functional circuitry in CSU patients to generate insights to aid chronic itch management.
Methods |
Forty CSU patients and forty healthy controls (HCs) were recruited. Seven-day urticaria activity score (UAS7) values were collected to evaluate clinical symptoms. Voxel-based morphometry (VBM) and seed-based resting-state functional connectivity (rs-FC) analysis were used to assess structural changes in the brain and associated changes in functional circuitry.
Results |
Compared with HCs, CSU patients had significantly increased grey matter (GM) volume in the right premotor cortex, left fusiform cortex, and cerebellum. UAS7 values were positively associated with GM volume in the left fusiform cortex. In CSU patients relative to HCs, the left fusiform cortex as extracted by VBM analysis demonstrated decreased functional connectivity with the right orbitofrontal cortex, medial prefrontal cortex (mPFC), premotor cortex, primary motor cortex (MI), and cerebellum and increased functional connectivity with the right posterior insular cortex, primary somatosensory cortex (SI), and secondary somatosensory cortex (SII). The left cerebellum as extracted from VBM analysis demonstrated decreased functional connectivity with the right supplementary motor area (SMA) and MI in CSU patients relative to HCs.
Conclusions |
Our findings indicate that patients suffering from chronic itching conditions, such as CSU, are likely to demonstrate altered GM volume in some brain regions. These changes may affect not only the sensorimotor area but also brain regions associated with cognitive function.
El texto completo de este artículo está disponible en PDF.Keywords : Chronic spontaneous urticaria, fMRI, Voxel-based morphometry, Urticaria activity score 7, Chronic itch
Esquema
Vol 48 - N° 4
P. 236-242 - juin 2021 Regresar al númeroBienvenido a EM-consulte, la referencia de los profesionales de la salud.
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