乙酰胆碱抑制去甲肾上腺素诱导的心肌H9c2细胞凋亡

Inhibitory effect of acetylcholine on apoptosis of myocardial H9c2 cells induced by norepinephrine

目的:探讨乙酰胆碱(ACh)对去甲肾上腺素(NE)诱导心肌H9c2细胞凋亡的作用及机制。方法:用不同浓度(0、5、10和20μmol/L)NE诱导心肌H9c2细胞凋亡,用ACh预处理细胞观察其作用,用MTT法检测细胞存活率,选出最适NE和ACh剂量。其次,分别加入与凋亡密切相关的4种信号分子阻断剂与ACh共同干预,用激光共聚焦成像JC-1法检测线粒体膜电位水平,DCFH-DA染色及流式细胞术检测胞内活性氧簇的水平,Annexin V-FITC/PI染色及流式细胞术检测细胞凋亡情况。结果:10μmol/L NE可明显诱导H9c2细胞凋亡(P<0.05);经10μmol/L ACh预处理后,可减弱NE诱导的H9c2细胞凋亡(P<0.05);在ACh预处理前分别预先加入4种分子阻断剂,发现加入PDTC后可减弱ACh的抑制作用。结论:ACh具有抑制NE诱导的心肌H9c2细胞凋亡的作用,其机制可能与NF-κB信号分子有关。

AIM: To investigate the inhibitory effect of acetylcholine(ACh) on the apoptosis of myocardial H9c2 cells induced by norepinephrine(NE). METHODS: The apoptosis model of myocardial H9c2 cells was established by treating the cells with NE at different concentrations, and ACh was used to observed the protective effect. The cell viability was measured by MTT assay and the optimal doses of NE and ACh were selected. Four blockers related to different signaling pathways were also used. The apoptotic rate was analyzed by flow cytometry with Annexin V-FITC/PI staining. JC-1 staining was used to observe the changes of mitochondrial membrane potential of the H9c2 cells. DCFH-DA staining was used to observe intracellular reactive oxygen species(ROS) production. RESULTS: The viability of H9c2 cells was decreased by treatment with NE at 10 μmol/L. The membrane potential of mitochondria was decreased, while ROS production and apoptotic rate were increased significantly(P<0.05). Pretreatment with ACh at 10 mmol/L resulted in the increase in cell viability and decrease in the ROS production, and inhibited the loss of mitochondrial membrane potential and cell apoptosis(P<0.05). After treatment with the 4 signaling pathway blockers before ACh, the protective effect of ACh was significantly reduced only by PDTC. CONCLUSION: ACh inhibits the apoptosis of H9c2 cells induced by NE, and its mechanism may be related to NF-κB signaling pathway.