灯盏乙素通过环状GMP-AMP合酶-干扰素基因刺激因子通路抑制BV-2小胶质细胞介导的神经炎症  

Scutellarin inhibitting BV-2 microglia-mediated neuroinflammation via the cyclic GMP-AMP synthase-stimulator of interferon gene pathway

作　　者：段兆达 杨力 陈浩伦 刘腾腾 郑立扬 徐冬垚 吴春云 DUAN Zhao-da;YANG Li;CHEN Hao-lun;LIU Teng-teng;ZHENG Li-yang;XU Dong-yao;WU Chun-yun(Department of Human Anatomy and Histology and Embryology,School of Basic Medical Sciences,Kunming Medical University,Kunming 650500,China)

机构地区：[1]昆明医科大学基础医学院人体解剖学与组织学胚胎学系,昆明650500

出　　处：《解剖学报》2024年第2期133-142,共10页Acta Anatomica Sinica

基　　金：国家自然科学基金(81960223);云南省教育厅科学研究基金研究生项目(2023Y0793)。

摘　　要：目的探讨灯盏乙素对脂多糖(LPS)诱导的BV-2小胶质细胞神经炎症的影响。方法培养BV-2小胶质细胞系,将BV-2小胶质细胞分为对照组(Ctrl)、环状GMP-AMP合酶(cGAS)抑制剂RU320521(RU.521)组、LPS组、LPS+RU.521组、LPS+灯盏乙素预处理(LPS+S)组、LPS+S+RU.521组,共6组。Western blotting及免疫荧光双标染色法检测并观察BV-2小胶质细胞中cGAS、干扰素基因刺激因子(STING)、核因子κB(NF-κB)、磷酸化NF-κB(p-NF-κB)、PYD结构域蛋白3(NLRP3)和肿瘤坏死因子α(TNF-α)的表达变化(n=3)。结果Western blotting和免疫荧光双标染色均显示,与对照组相比,LPS诱导后,BV-2小胶质细胞中cGAS、STING、p-NF-κB、NLRP3和TNF-α蛋白的表达水平显著升高(P<0.05);与LPS组相比,LPS+S组中cGAS、STING、p-NF-κB、NLRP3和TNF-α蛋白的表达水平显著下降(P<0.05)。使用cGAS通路抑制剂RU.521后显示了与灯盏乙素预处理组相似的作用效果。此外,NF-κB在各组的变化不明显(P>0.05)。结论灯盏乙素干预抑制BV-2小胶质细胞介导的神经炎症反应,可能与cGAS-STING信号通路有关。Objective To explore the effect of scutellarin on lipopolysaccharide(LPS)induced neuroinflammation in BV-2 microglia cells.Methods BV-2 microglia were cultured and randomly divided into 6 groups:control group(Ctrl),cyclic GMP-AMP synthetase(cGAS)inhibitor RU320521 group(RU.521 group),LPS group,LPS+RU.521 group,LPS+scutellarin pretreatment group(LPS+S)and LPS+S+RU.521 group.The expressions of cGAS,stimulator of interferon gene(STING),nuclear factor kappa B(NF-κB),phosphorylated NF-κB(p-NF-κB),neuroinflammatory factors PYD domains-containing protein 3(NLRP3)and tumor necrosis factorα(TNF-α)in BV-2 microglia were detected by Western blotting and immunofluorescent double staining(n=3).Results Western blotting and immunofluorescent double staining showed that compared with the control group,the expression of cGAS,STING,p-NF-κB,NLRP3 and TNF-αin BV-2 microglia increased significantly after LPS induction(P<0.05),while the expression of cGAS,STING,p-NF-κB,NLRP3 and TNF-αin LPS+S group were significantly lower than those in LPS group(P<0.05).Treatment with cGAS pathway inhibitor RU.521 showed similar effects as the pre-treatment group with scutellarin.In addition,the change of NF-κB in each group was not statistically significant(P>0.05).Conclusion Scutellarin inhibits the neuroinflammation mediated by BV-2 microglia cells,which may be related to cGAS-STING signaling pathway.

关 键 词：灯盏乙素 BV-2小胶质细胞 环状GMP-AMP合酶-干扰素基因刺激因子通路 PYD结构域蛋白3 神经炎症 免疫荧光 免疫印迹法 

分 类 号：R363.21[医药卫生—病理学]