中碳鏈脂肪酸改善脂變肝細(xì)胞損傷和脂代謝紊亂的機(jī)制
[Abstract]:With the improvement of people's living standards and the decrease of physical activities, the incidence of obesity and related metabolic diseases has increased significantly, and then the health of the body has been damaged. In this paper, we used combinatorial biology technology to establish the cell model of nonalcoholic fatty liver disease (NAFLD). Fatty acid (FA) was used to investigate the molecular mechanism of apoptosis, oxidative stress, immune regulation and lipid metabolism in NAFLD. Cell viability assay, LDH cell necrosis assay, Hoechst 33342 staining for cell apoptosis assay, oil red O staining and triglyceride (TG) quantitative assay, and scanning electron microscopy for cell membrane damage detection were used to establish NALD model (maximum lipid precipitation and low cytotoxicity) in accordance with the law of human natural diseases. Exploration. The expression of immune factors in diet was investigated by Annexin V-FITC/PI double staining flow cytometry (FCM) and Hoechst 33342/PI fluorescence microscopy, antioxidant and oxidative stress assays, differential proteomics, WB and ELISA combined with fluorescence quantitative PCR. Effects of A species on apoptosis, immune regulation and oxidative stress in human hepatic steatosis cells and the mechanism of promoting NAFLD to further liver injury were investigated. MTT cell activity assay, oil red O staining, TG qualitative and quantitative assay, fluorescence quantitative PCR of lipid metabolism genotype, ELISA and WB were used to study the effect of MCFA on NAFLD. The main results of this study are summarized as follows: In the first chapter, the biological characteristics of MCFA and the research progress of NAFLD are reviewed respectively, and the molecular mechanism of NAFLD is prospected. Advances in the study of NAFLD include the pathogenesis, establishment of models, apoptosis, oxidative stress, immune regulation and related lipid metabolism signaling pathways. Chapter 2 provides the best conditions for the establishment of NAFLD models in accordance with the laws of human natural diseases. The effects of mixed FA (oleic acid: palmitic acid = 2:1) and single FA (oleic acid) on the proliferation and apoptosis of L02 and HepG2 hepatocytes were investigated by MTT and LDH mutual validation. The results showed that the toxicity of FA on both L02 and HepG2 hepatocytes was time-and concentration-dependent. When the concentration of FA was lower than 400 mu M, there was no effect on the cell viability, and L. The results of Hoechst staining showed that the degree of apoptosis was positively correlated with the concentration of FA. When the concentration was less than 400 mu M, no apoptosis was observed compared with the control group. When the concentration was raised to 800 mu M, the apoptosis could be induced. Qualitative observation of lipid droplets and cell morphology by oil red O staining and quantitative determination of intracellular TG by phosphoglycerol oxidase showed that FA mixture was more suitable for establishing hepatic steatosis cell model than single FA. When mixed FA and LO2 cells incubated for 24 hours and the final concentration was 200 mu M, it reached Chapter 3 investigates the effects of dietary FA on apoptosis and oxidative stress in human hepatic steatosis cells, and explores the mechanism of promoting NAFLD to further liver injury. Compared with LCFA, MCFA can significantly reduce early hepatic steatosis. The results of oxidation analysis showed that LCFA could inhibit the production of antioxidant enzymes by protein two-dimensional electrophoresis and secondary mass spectrometry; furthermore, the determination of SOD, MDA, GSH and ROS also showed that MCFA did not produce oxidative stress, but LC did. The results showed that FA could inhibit the further damage of hepatic steatosis cells by changing the types of FA in diet, and could not promote the further deterioration of the disease. The results of NO and iNOS assay showed that the levels of NO and iNOS were not increased in MCFA group compared with NR group, and the levels of NO and iNOS were not significantly increased in LCFA group. The results of this chapter show that FA-induced apoptosis of hepatic steatosis cells does not depend on NO and iNOS pathways, and LCFA can strongly induce cellular immune response. The intake of MCFA-containing lipids plays a positive role in the further deterioration of NAFLD to NASH. Chapter 5 Excessive lipid deposition in the liver can lead to the disorder of hepatocyte function, thereby promoting fatty liver. This chapter explores the effects of MCFA on lipid metabolism in NAFLD cells and attempts to find alternatives to fat in the diet. Oil red O staining and TG assays suggest that compared with LCFA (oleic acid, C18:1), MCFA can significantly reduce liver steatosis L. The results of RT-PCR and WB showed that MCFA could down-regulate the expression of LPL, FAS, ACC, LXR-alpha, CD36 and SREBP-1 adipogenesis genes in hepatic steatosis cells by down-regulating the expression of LPL, FAS, ACC, LXR-alpha, CD36 and SREBP-1 adipogenesis genes, and up-regulating the expression of ATGL and HSL in hepatic steatosis cells. Chapter 6 Conclusion and prospect summarize the molecular mechanism of MCFA on apoptosis, antioxidant system, immune regulation and lipid metabolism of NAFLD cell model, and prospect the follow-up research. In this paper, the establishment of NAFLD cell model and the biological effects of MCFA on cell viability and apoptosis, antioxidant system, lipid precipitation and immune response were studied. The mechanism of lipid metabolism and immune regulation by MCFA was discussed at cellular and molecular levels. Rational selection of FA types in food for obese people has a positive guiding role, which provides a scientific basis for the prevention and treatment of NAFLD.
【學(xué)位授予單位】:南昌大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2017
【分類號】:TS221;TS201.4
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