摘要
目的研究成纤维细胞生长因子21(FGF21)对棕榈酸酯诱导的人肝细胞脂肪堆积、炎症因子表达的作用及其机制。方法采用组蛋白去乙酰化酶转录沉默信息调节因子1(SIRT1)短发夹RNA(shRNA)慢病毒,建立L02SIRT1稳定敲低细胞系;L02细胞以及SIRT1敲低细胞系给予棕榈酸酯(palmitate)处理,建立高脂细胞模型,在此基础上给予FGF21,检测细胞甘油三酯(TG)、丙二醛(MDA)水平;ELISA检测细胞肿瘤坏死因子α(TNF-α)和白细胞介素6(IL-6)水平;MitoSOX染色结合流式细胞术检测细胞线粒体活性氧(ROS)水平;实时定量PCR检测SIRT1、过氧化物酶体增殖物激活受体辅激活因子1α(PGC1α)、超氧化物歧化酶2(SOD2)以及过氧化氢酶(CAT)的mRNA水平;Western blot法检测SIRT1、 PGC1α、 SOD2、 CAT蛋白水平;JC-1染色结合激光共聚焦检测线粒体膜电位;Seahorse XF细胞线粒体压力测试试剂盒检测线粒体氧化呼吸功能。结果棕榈酸酯可增加L02细胞内TG水平,引起细胞和线粒体氧化应激,降低SIRT1、 PGC1α、 SOD2以及CAT的mRNA和蛋白水平,增加细胞TNF-α、 IL-6水平,降低线粒体膜电位、损害线粒体功能。FGF21处理显著逆转以上作用。SIRT1敲低后,则FGF21的上述作用消失。结论 FGF21通过激活SIRT1通路改善高脂诱导的人肝细胞脂肪堆积,减少细胞氧化应激反应和炎症因子释放,改善线粒体功能。
Objective To investigate the effect of fibroblast growth factor 21(FGF21) on the lipid accumulation and inflammation induced by palmitate treatment in L02 hepatocytes and the underlying mechanism. Methods L02 cells were infected with lentivirus expressing SIRT1 shRNA to knockdown SIRT1 expression. Wild-type and SIRT1-knockdown L02 cells were treated with 250 mol/L palmitate for 5 days, and then administrated with 1 g/ml FGF21 for 72 hours. Triglycerides in the cells were detected with the infinity triglycerides reagent. Malondialdehyde(MDA) in the cells was assessed by MDA detection assay. Tumor necrosis factor α(TNF-α) and interleukin 6(IL-6) levels in supernatant were measured by ELISA. Reactive oxygen species(ROS) levels were tested by the specific Amplex red ROS detection assay kit from Thermo Fisher Company. The gene expression of SIRT1, peroxisome proliferator-activated receptor γ coactivator 1α(PGC1α), superoxide dismutase 2(SOD2) and catalase(CAT) were measured by real-time quantitative PCR. The protein levels of SIRT1, PGC1α, SOD2 and CAT were detected by Western blot analysis. Mitochondrial membrane potentials were detected by the JC-1staining kit. Mitochondrial oxygen consumption rate(OCR) was detected with the Seahorse XF Mito stress test kit. Results Palmitate increased the triglycerides level, induced the oxidative stress in both the cells and the mitochondria, decreased the gene expression and protein levels of SIRT1, PGC1α, SOD2 and CAT, increased the levels of TNF-α and IL-6, decreased the mitochondrial membrane potential, and impaired the mitochondrial function. FGF21 treatment could attenuate all of these effects caused by palmitate, while SIRT1 knockdown blocked most of the FGF21 effects on the L02 hepatocytes. Conclusion FGF21 activates SIRT1 pathway and inhibites the lipid accumulation, improves the mitochondrial function, and decreases the oxidative stress as well as inflammation in palmitate-treated L02 cells.
作者
南瑛
相里伟
张薇
郭玉芳
曹健
NAN Ying;XIANG Liwei;ZHANG Wei;GUO Yufang;CAO Jian(Insititute of Basic Medicine Science,Xian Medical University,Xi'an 710021;Department of Cardiovascular Surgery,Second Affiliated Hospital of Xi'an Jiaotong University,Xi'an 710004;Department of Cardiology,Tangdu Hospital,Air Force Medical University,Xi'an 710032,China)
出处
《细胞与分子免疫学杂志》
CAS
CSCD
北大核心
2019年第7期606-612,共7页
Chinese Journal of Cellular and Molecular Immunology
基金
国家自然科学基金(81470537)
陕西省教育厅专项科研计划项目(16JK1649)
西安医学院校级配套基金(2017PT43)
