川陈皮素调节AMPK/NLRP3信号通路对脂多糖诱导的肾小球系膜细胞炎性损伤的影响

Effect of Nobiletin on LPS-Induced Inflammatory Injury of Mesangium Cells by Regulating AMPK/NLRP3 Signaling Pathway

目的探讨川陈皮素(Nobiletin)调节AMP激活的蛋白激酶(AMPK)/NOD样受体蛋白3(NLRP3)信号通路对脂多糖(LPS)诱导的肾小球系膜细胞HBZY-1炎性损伤的影响。方法将HBZY-1细胞分为5组:正常组、LPS组(100 ng·m L^(-1)LPS)、川陈皮素组(100 ng·m L^(-1)LPS+40μmol·L^(-1)川陈皮素)、AMPK/NLRP3信号通路抑制剂雷帕霉素组(100 ng·m L^(-1)LPS+0.5μmol·L^(-1)雷帕霉素)、川陈皮素+雷帕霉素组(100 ng·m L^(-1)LPS+40μmol·L^(-1)川陈皮素+0.5μmol·L^(-1)雷帕霉素)。MTT法检测HBZY-1细胞毒性和增殖;ELISA法检测HBZY-1细胞白细胞介素(IL)-1β、IL-6、肿瘤坏死因子α(TNF-α)、过氧化氢酶(CAT)、超氧化物歧化酶(SOD)、谷胱甘肽(GSH)含量;流式细胞术检测细胞凋亡;Western Blot法检测AMPK/NLRP3信号通路蛋白水平。结果与正常组比较,LPS组CAT、SOD、GSH水平、细胞OD值以及AMPK蛋白水平明显降低(P<0.05),细胞凋亡率、IL-1β、IL-6、TNF-α含量以及NLRP3蛋白水平明显升高(P<0.05)。与LPS组比较,川陈皮素组CAT、SOD、GSH水平、OD值以及AMPK蛋白水平明显升高(P<0.05),细胞凋亡率、IL-1β、IL-6、TNF-α含量以及NLRP3蛋白水平明显下降(P<0.05);而雷帕霉素组以上指标均呈现与川陈皮素组相反的趋势(P<0.05)。与川陈皮素组比较,川陈皮素+雷帕霉素组以上指标均呈现与川陈皮素组相反的趋势(P<0.05)。结论川陈皮素可能通过上调AMPK/NLRP3信号通路减轻LPS诱导的肾小球系膜细胞细胞炎性损伤。下调AMPK/NLRP3信号通路可消除川陈皮素对LPS诱导的肾小球系膜细胞细胞炎性损伤的改善作用。

Objective To investigate the effect of nobiletin(Nb)on lipopolysaccharide(LPS)-induced inflammatory injury of mesangium cells(HBZY-1)by regulating AMP-activated protein kinase(AMPK)/NOD-like receptor protein 3(NLRP3)signaling pathway.Methods HBZY-1 cells were separated into 5 groups:normal control(NC)group,LPS group(100 ng·mL^(-1)LPS),and Nb group(100 ng·mL^(-1)LPS+40μmol·L^(-1)Nb),Rapamycin(Rap,AMPK/NLRP3 signaling pathway inhibitor)group[100 ng·mL^(-1)LPS+0.5μmol·L^(-1)Rap],and Nb+Rap group(100 ng·mL^(-1)LPS+40μmol·L^(-1)Nb+0.5μmol·L^(-1)Rap).MTT was applied to detect the cytotoxicity and proliferation of HBZY-1 cells.ELISA was applied to detect the contents of interleukin(IL)-1β,IL-6,tumor necrosis factor-α(TNF-α),catalase(CAT),superoxide dismutase(SOD),and glutathione(GSH)in HBZY-1 cells.Flow cytometry was used to detect cell apoptosis.Western Blot was applied to detect the protein levels of AMPK/NLRP3 signaling pathway.Results Compared with the NC group,the levels of CAT,SOD,GSH,cell OD value,and the level of AMPK protein in the LPS group were significantly reduced(P<0.05).The apoptosis rate,contents of IL-1β,IL-6,TNF-α,and the level of NLRP3 protein were significantly increased(P<0.05).Compared with the LPS group,the levels of CAT,SOD,GSH,OD value,and the level of AMPK protein in the Nb group were significantly increased(P<0.05).The apoptosis rate,contents of IL-1β,IL-6,TNF-α,and the level of NLRP3 protein were significantly decreased(P<0.05),while the above indicators in the Rap group showed an opposite trend to the Nb group(P<0.05).Compared with the Nb group,the above indicators in the Nb+Rap group also showed an opposite trend to the Nb group(P<0.05).Conclusion Nb may alleviate LPS-induced inflammatory injury to MC cells by up-regulating the AMPK/NLRP3 signaling pathway.But down-regulation of the AMPK/NLRP3 signaling pathway may eliminate the improvement effect of Nb on LPS-induced inflammatory injury in MC cells.