探究CUL4B表達對胃癌細胞的影響
[Abstract]:According to statistics, gastric cancer is the fifth largest malignant tumor in the world. The mortality rate of the third [1]. gastric cancer in the world is very different in different countries and regions. In Asia, the number of cases of gastric cancer accounts for 73.6% of the total number of cases in the world, of which the number of gastric cancer patients in China accounts for the world's 42.7%. in the 2015 Chinese confirmed cancer cases. The incidence of sexual gastric cancer accounts for second of the total cancer incidence and third in women. The main treatment methods for gastric cancer include surgical resection, chemotherapy, immunotherapy, and directional therapy. Although diagnosis and treatment techniques have improved in recent years, the survival period of patients with advanced gastric cancer is still less than 1 years, and the early diagnosis is lack of early diagnosis. Effective methods of gastric cancer, the prognosis of patients with advanced gastric cancer is poor.CUL4B (Cullin 4B) as a scaffold protein involved in the formation of E3 ubiquitin ligase complex Cullin 4B-Ring E3 Ligase (CRL4B), involved in the regulation of cell cycle, cell signal transduction, gene transcription and individual growth and development of organisms, such as many important activities of.CRL4B can not only pass through the life of.CRL4B. Excessive ubiquitination of p53 and cyclin E participates in the regulation of cell proliferation and senescence, and can also regulate the expression of p16, p21, PTGDS, and miRNA-371/372 by regulating the expression of p16, p21, PTGDS, and miRNA-371/372 through a single ubiquitin H2A protein, regulating the acetylation and methylation of the target gene promoter H3. More and more evidence shows that CRL4B is swollen. .CRL4B can play an important role in the development of tumor. H2AK119 can be used to inhibit the expression of Wnt antagonist, PTEN, IGFBP3 and miR-194. In cancer of cervical cancer, liver cancer and non-small cell lung cancer, CRL4B plays oncogene function by inhibiting the expression of tumor suppressor genes. Interestingly, there is also a research result in this laboratory. It is suggested that CUL4B can inhibit the growth of tumor by regulating the differentiation of MDSC cells in microenvironment. Therefore, CUL4B plays different functions in the occurrence and development of tumor in different environments. To the present, the role of CUL4B in gastric cancer has not been reported. In order to explore the function of CUL4B in gastric cancer, we first detected CUL4B in gastric cancer. The expression level in the tissue, and the effect of CUL4B expression on the proliferation, migration and invasion of gastric cancer cells and the sensitivity to chemotherapeutic drugs. First, we detected the expression of CUL4B in gastric and paracancerous tissues. The results showed that the expression level of CUL4B in gastric cancer tissues was significantly up-regulated compared with the Para cancerous tissues, and the expression of CUL4B and gastric cancer was associated with gastric cancer. Three kinds of gastric cancer cells, MKN-45, BGC-823 and SGC-7901, were then used to construct three kinds of CUL4B low expression gastric cancer cell lines and corresponding unloaded body control cell lines, and the MKN-45 CUL4B high expression cell line and the corresponding empty body control cell line were constructed. MTT test was used to detect the proliferation activity of gastric cancer cells after the decrease of CUL4B expression. The results showed that the expression of CUL4B decreased to inhibit the proliferation activity of gastric cancer cells. We did not find that the decrease of CUL4B expression had a significant effect on the cell cycle of gastric cancer by flow method. The results of cell dynamics analysis showed that CUL4B did not affect the stomach. The cancer cell G1/S and the M/G1 phase process, EdU incorporation test also showed that the decrease of CUL4B expression had no obvious effect on the DNA synthesis of gastric cancer cells, suggesting that CUL4B regulation of the proliferation activity of gastric cancer cells was not realized by the regulation of the above process. Then we used Transwell experiment and scratch test to analyze the migration of CUL4B expression to gastric cancer cell migration. The effect of invasive ability, the results of scratch test showed that the cell migration ability of CUL4B expression decreased significantly compared with the control cells. Then, we used MTT test to find that the sensitivity of gastric cancer cells with low expression of CUL4B to cisplatin and pirirubicin with the same concentration was increased by.TUNEL experimental analysis relative to the control cells. The results showed that the CUL4B low expression of gastric cancer cells had a higher percentage of apoptosis after cisplatin treatment. These results showed that CUL4B was involved in regulating the sensitivity of gastric cancer cells to chemotherapeutic drugs. In conclusion, we confirmed that the expression of CUL4B in gastric cancer was up regulated by this study and that the level of CUL4B expression was positively correlated with the classification of gastric cancer; cytological experimental results showed that Inhibition of CUL4B expression can inhibit the proliferation of gastric cancer cells, invasion and migration and increase the sensitivity of gastric cancer cells to chemotherapeutic drugs. These results suggest that CUL4B plays the role of proto oncogene in gastric cancer. The results provide some experimental data for further exploring the function of CUL4B, in order to elucidate the mechanism of gastric cancer. The selection of new tumor marker genes and the study of new therapies have laid a theoretical foundation.
【學位授予單位】:山東大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:R735.2
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