α-硫辛酸和NAC在鎘致神經細胞氧化損傷和線粒體凋亡通路中的保護效應
[Abstract]:To investigate the protective effects of 偽 -lipoid acid (偽 -LA) and N-acetylcysteine (NAC) on the oxidative damage of neurons and mitochondrial apoptosis pathway induced by cadmium. The primary cerebral cortical neurons and PC12 cell lines of fetal SD rats aged 18-19 days were used as models. The cells were treated with 10 渭 mol/L cadmium for different time (0 ~ 612A 24U 48 h),) and 10 or 20 渭 mol/L cadmium in combination with 100 渭 mol/L a-LA or NAC for 24 h. The activities of superoxide dismutase (SOD),) catalase (CAT), glutathione peroxidase (GSH-Px) and glutathione reductase (GR), glutathione transferase (GST) were measured by colorimetry. The content of glutathione (GSH), malondialdehyde (MDA), the activity of GSH-Px and the content of MDA in mitochondria of nerve cell were measured. The changes of (ROS) in cells were observed by immunofluorescence, and the apoptosis rate was determined by flow cytometry and Annexin V-FITC staining. The expression of VDAC, cleaved caspase-39, Bcl-2 and Bax protein and the release of Cyt C in mitochondrial pathway were detected by Western blot. The results showed that 10 渭 mol/L cadmium exposure at different time or concentration for 24 h could significantly or extremely increase the activity of PCI2 cells or decrease the activity of GSH-PxX GSTGR and the content of GSH in rat cerebral cortex neurons. The Ros content of MDAA was significantly or extremely significantly increased (P0.05 or P0.01), and showed a certain dose. Time-effect relationship. Compared with the exposed group, the content of Ros was significantly decreased (P0.01) after cadmium combined with a-LA or NAC (P0.05 or P0.01). The activity of GSH-PxGST and the content of GSH were significantly increased (P0.05) compared with the control group. Exposure to different concentrations of cadmium for 24 h resulted in a significant or extremely significant increase in the activity or decrease of GSH-Px in mitochondria (PC12 cells) and a significant or extremely significant decrease in GSH-Px activity and MDA content in mitochondria (PC12 cells). It was elevated (P0.05 or P0.01) and showed a dose-effect relationship. Compared with the exposed group, the activity of GSH-Px increased significantly (P0.05 or P0.01) after cadmium combined with a-LA or NAC (P0.05 or P0.01). Compared with the control group, 20 渭 mol/L cadmium exposure significantly increased the apoptosis rate and promoted the release of CytC in mitochondria. The expression of Bcl-2 protein and the expression of cleaved caspase-3 and caspase-9 protein were significantly decreased (P0.01). Compared with the exposed group, cadmium combined with a-LA or NAC significantly inhibited the expression of Bax protein and the release of CytC, and significantly increased the expression of Bcl-2VDAC protein (P0.01). Conclusion cadmium can induce oxidative damage of nerve cells and activate mitochondrial apoptotic pathways such as a-LA and NAC as antioxidants, which can enhance the antioxidant ability of neurons. It has a protective effect on oxidative injury and mitochondrial oxidative damage induced by cadmium, and can inhibit the activation of mitochondrial apoptosis pathway.
【學位授予單位】:揚州大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:S852.3
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