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Regulatory role of electroacupuncture on satellite glial cell activity in the colon and dorsal root ganglion of rats with irritable bowel syndrome

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Journal of Traditional Chinese Medicine 2024年第5期44卷 981-990页

作者： ZHANG Fang YAN Cuina WENG Zhijun WU Luyi QI Li ZHAO Min XIN Yuhu WU Huangan LIU Huirong Key Laboratory of Acupuncture and Immunological Effects Yueyang Hospital of Integrated Traditional Chinese and Western MedicineShanghai University of Traditional Chinese Medicine Shanghai Research Institute of Acupuncture and Meridian Shanghai University of Traditional Chinese Medicine Cancer Hospital Fudan University

OBJECTIVE: To investigate the role of satellite glial cells in irritable bowel syndrome(IBS) and the effect of electroacupuncture(EA) at the Tianshu(ST25) and Shangjuxu(ST37) combination. METHODS: A model for visceral hypersensitivity in IBS was induced through colorectal distension(CRD) stimulation. Clean-grade male Sprague-Dawley(SD) rats were randomly divided into four groups: a normal group(NG), a model group(MG), an electroacupuncture group(EA), and a glial cell inhibitor group(FCA). Bilateral EA(2/100 Hz, 1 mA, 30 min) was administered at the Tianshu(ST25) and Shangjuxu(ST37) in week 6. Abdominal withdrawal reflex(AWR) scores were used to assess the behavioral response associated with visceral hyperalgesia, while hematoxylin-eosin staining was employed to evaluate pathological changes in the colon. The protein and mRNA levels of glial fibrillary acidic protein(GFAP) in the colon and colon-related dorsal root ganglion(DRG) were analyzed using immun-ofluorescence, immunohistochemistry, Western blotting, real-time polymerase chain reaction. The impact of EA on electrophysiological properties of colon-related DRG neurons was observed through whole-cell patch clamp analysis. RESULTS: EA significantly reduced the visceral pain behavior scores in rats with IBS in response to graded(20, 40, 60, 80 mm Hg) CRD stimulation. Additionally, EA downregulated the protein and mRNA expression levels of GFAP in the colon and colon-related DRG of rats with IBS. EA also regulated the resting membrane potential, rheobase and action potential of colon-related DRG neurons in rats with IBS. CONCLUSIONS: EA can regulate the excitatory properties of colon-related DRG neurons by downregulating the protein and mRNA expression of GFAP in the colon and colon-related DRG, indicating a potential neurobiological mechanism by which EA relieves visceral hypersensitivity in rats with IBS.

关键词： electroacupuncture glial fibrillary acidic proteinSupporting information irritable bowel syndrome satellite glial cell visceral hypersensitivity

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