雙環(huán)醇對人肝癌細胞HepG2的周期抑制及自噬誘導作用的研究
[Abstract]:Hepatocellular carcinoma is the fifth largest tumor in the world and has a very high morbidity and mortality. Although a variety of methods such as chemotherapy, excision, liver transplantation, and immunotherapy have been used to treat the liver cancer, the survival rate of the liver cancer is only 3-5% in the developed countries, which has prompted the people to continue to find new methods of treating the liver cancer. Bicyclol (4,4 '-dimethoxy-5,6,5',6 '-bis (methylenedioxy) -2-hydroxymethyl-2'-methoxyphenyl) is a new drug for anti-hepatitis chemical synthesis, and has been widely used in the treatment of HBV infection. In addition, some studies have shown that the bicyclol also has the function of improving the liver function, It is also found that the double-ring alcohol can induce the expression of the heat shock protein HSP27/70 in the liver cancer cell, thereby inhibiting the apoptosis of the mitochondrial pathway of the cell. The anti-tumor effect of the double-ring alcohol and the study of the function of the double-ring alcohol in the cell cycle and autophagy of the tumor are still rare, The preliminary study on the high-throughput screening of differentially expressed genes in the cancer cells after the double-ring alcohol in the relevant literature shows that the double-ring alcohol has the potential as an anti-cancer drug, and therefore, the research focuses on the toxic effect of the bicyclol on the HepG2 cells, And the molecular mechanism of the double-ring alcohol on the action of the liver cancer cells is explored in the in vitro and in vivo environment, and the results are as follows:1. the double-ring alcohol can obviously inhibit the proliferation of the HepG2 cells, and the toxicity to the normal liver cells LO2 is very low. The IC50 value of bicyclol on HepG2 cells is one-third of the LO2 cell, and by flow cytometry it is found that the inhibitory effect of bicyclol on the activity of HepG2 cells is mainly due to its ability to inhibit cell cycle and to induce autophagy of the cells, and the level of apoptosis of HepG2 cells under the action of the bicyclol is not changed. In the aspect of the cell cycle, the double-ring alcohol can induce the G1 phase cell block which is dependent on the time and the concentration gradient of the HepG2 cells, In addition, the observation of GFP-RFP-LC3 transfected cells and the direct observation of transmission electron microscope (TEM) of GFP-RFP-LC3 were observed by fluorescence microscope. The number of autophagy bodies and autophagy lysosomes in the cells increased significantly after the double-ring alcohol induction treatment. These results indicated that the double-ring alcohol inhibited the cell activity of HepG2 by inhibiting the cell cycle and the autophagy of the cells.2. The bicyclol inhibited the PI3K/ AKT pathway and the Ras/ Raf/ MEK/ ERK pathway at the same time. The double-ring alcohol can induce the expression of p21CIP1 and p27KIP1, inhibit the level of CDK2-cyclinE and CDK4-cyclinD complex, and dephosphorylation of Rb protein results in cell cycle arrest in G1 phase. At the same time, it was found that the double-ring alcohol induced autophagy of the cell by inhibiting the activity of mTOR protein. By further studying the upstream signal path of the cycle and autophagy, it was found that the double-ring alcohol significantly inhibited the phosphorylation of the AKT protein. The PI3K/ AKT pathway was downregulated. The effect of Bicyclol on the cycle inhibition and autophagy of the tumor cells was reduced by the transfection of AKTcDNA. The results show that AKT plays an important role in the inhibition of tumor cell activity. The results indicated that the cytotoxicity of the double-ring alcohol was closely related to the PI3K/ AKT pathway and the Ras/ Raf/ MEK/ ERK pathway. The effect of the alcohol in the in vivo environment is that the HepG2 cells are transplanted to a nude mouse by an underarm transplantation method, and the bicyclol and sorafenib are administered by oral administration. The results show that the bicyclol reduces the tumor volume in the mice and reduces the weight of the tumor, The method of HE staining and TUNEL staining showed that the double-ring alcohol in the tumor tissue caused a certain degree of death of the tumor cells, and no similar phenomenon was found in the liver tissue. Western blotting and immunohistochemistry were performed on the tumor tissues. In conclusion, the inhibition and proliferation of the bicyclol on the tumor cells is derived from cell cycle inhibition and autophagy. In vitro and in vivo environment, The toxicity of the double-ring alcohol is related to the inhibition of the PI3K/ AKT pathway and the Ras/ Raf/ MEK/ ERK pathway.
【學位授予單位】:浙江大學
【學位級別】:博士
【學位授予年份】:2016
【分類號】:R735.7
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