论文部分内容阅读
目的:评价铁死亡在高脂高糖心肌细胞缺氧复氧损伤中的作用。方法:正常培养的H9c2心肌细胞，采用随机数字表法分为3组(n n＝20)：对照组(C组)、高脂高糖-缺氧复氧组(HFHG+H/R组)和Ferrostatin-1+高脂高糖-缺氧复氧组(Fer-1+HFHG+H/R组)。采用高脂高糖处理12 h，随后缺氧4 h，复氧2 h的方法制备H9c2心肌细胞缺氧复氧损伤模型。Fer-1+HFHG+H/R组在高脂高糖处理同时加入铁死亡抑制剂Ferrostatin-1，终浓度10 μmol/L。于复氧2 h时，采用CCK-8法检测细胞活力，2，4二硝基苯肼显色法检测上清液LDH活性，荧光探针DCFH-DA流式细胞术检测ROS活性，Western blot法检测心肌细胞长链脂酰辅酶A合成酶4(ACSL4)、核受体共激活因子4(NCOA4)和谷胱甘肽过氧化物酶4(GPX4)的表达。n 结果:与C组比较，HFHG+H/R组细胞活力降低，LDH活性、ROS活性、ACSL4和NCOA4表达水平升高(n P0.05)；与HFHG+H/R组比较，Fer-1+HFHG+H/R组细胞活力升高，LDH活性、ROS活性、ACSL4和NCOA4表达水平降低(n P0.05)。n 结论:铁死亡参与了高脂高糖心肌细胞缺氧复氧损伤的过程。“,”Objective:To evaluate the role of ferroptosis in hypoxia-reoxygenation (H/R) injury in cardiomyocytes cultured in high-fat high-glucose (HFHG) medium.Methods:Cardiomyocytes H9c2 cells were commonly cultured and divided into 3 groups (n n=20 each) using a random number table method: control group (C group), HFHG-H/R group and Ferrostatin-1 (Fer-1) plus HFHG-H/R group (Fer-1+ HFHG+ H/R group). H9c2 cells were cultured in a HFHG medium for 12 h and then exposed to 1%On 2-5%COn 2-94%Nn 2 for 4 h, followed by 2 h reoxygenation in a cell incubator.Fer-1 at a final concentration of 10 μmol/L was added while the cells were cultured in the HFHG medium in group Fer-1+ HFHG+ H/R.At 2 h of reoxygenation, the cell viability was measured using CCK-8 assay, the activity of lactate dehydrogenase (LDH) in the supernatant was measured using 2, 4-dinitrophenylhydrazine color method, the activity of reactive oxygen species (ROS) was measured by fluorescent probe DCFH-DA flow cytometry, and the expression of acyl-CoA synthetase long-chain family member 4 (ACSL4), nuclear receptor coactivator 4 (NCOA4), and glutathione peroxidase 4 (GPX4) was detected by Western blot.n Results:Compared with group C, the cell viability was significantly decreased, the activities of LDH release and ROS were increased, and the expression of ACSL4 and NCOA4 was up-regulated (n P0.05). Compared with group HFHG+ H/R, the cell activity was significantly increased, the activities of LDH and ROS were decreased, and the expression of ACSL4 and NCOA4 was down-regulated (n P0.05).n Conclusions:Ferroptosis is involved in the process of H/R injury in cardiomyocytes cultured in HFHG medium.