Frequency-dependent and temporal variability of low-frequency fluctuations in patients with primary Sjögren’s syndrome

作者：C F Hu, Luoyu Wang, Xiuhong Ge, Zhijiang Han, Xiaofang Zhang, Xinyun Du, Yushan Shang, Huijun Cao, Chengcheng Gao, Peiying Wei, Jiao Huang · 发表于：Lupus Science & Medicine · 年份：2025 · DOI：10.1136/lupus-2025-001655 · 被引用次数：1 · 研究领域：Salivary Gland Disorders and Functions、Autoimmune Neurological Disorders and Treatments、Glycogen Storage Diseases and Myoclonus

OBJECTIVES: The central nervous system is a significant extraglandular target in primary Sjögren's syndrome (pSS), often characterised by cognitive deficits. However, the underlying mechanisms remain elusive. This study aims to investigate the alterations in amplitude of low-frequency fluctuations (ALFF) in patients with pSS and to explore whether it exhibits frequency dependence and temporal variability, attempting to explore its mechanism. METHODS: The study comprised 68 patients with pSS and 69 healthy controls, all of whom underwent resting-state functional MRI and neuropsychological assessments. The ALFF method was used to ascertain whether frequency-dependent alterations occur within the slow-5 (0.01-0.027 Hz) and slow-4 (0.027-0.073 Hz) frequency bands. Additionally, dynamic ALFF (dALFF) analysis was conducted to explore the temporal variability. Ultimately, the correlation between the abnormal brain regions and neuropsychological assessments was elucidated. RESULTS: The right fusiform gyrus of patients with pSS shows abnormalities in ALFF and its two sub-bands, while the left precentral gyrus and right middle frontal gyrus exhibited abnormal increase limited to the slow-5 frequency band. dALFF showed an abnormal activity in the left supplementary motor area in patients with pSS. Additionally, the differential brain regions identified by the slow-5 frequency band of ALFF correlated with certain neuropsychological scales. CONCLUSIONS: This research indicates that ALFF m...