抑制TRIM29的表達(dá)與胃癌細(xì)胞增殖關(guān)系的研究
[Abstract]:BACKGROUND OF THE INVENTION Gastric cancer is the second major cause of death in the world. For better diagnosis and treatment of gastric cancer, it is essential to determine the gene and its associated mechanism leading to the development and deterioration of the disease. Some studies have shown that TRIM29 is an important oncogenic gene in gastric cancer, and overexpression of TRIM29 mRNA is associated with poor prognosis and lower survival. However, most of the mechanisms of TRIM29 in gastric cancer are still unclear. RNA interference technique is a highly specific and easy-to-operate gene RNA transcription blocking technique found in recent years. In this study, we tried to detect the expression of TRIM29 gene and protein in gastric cancer tissues by using Real time qRT-PCR, Western-blot and siRNA interference technique, thus providing the basis for explaining the relationship between TRIM29 expression and clinical and prognosis in patients with gastric cancer. Purpose 1. To investigate the relationship between expression of TRIM29 and clinical and prognosis of gastric cancer patients. The effect mechanism of TRIM29 on gastric cancer cells was analyzed by transfection of siRNA plasmid and inhibition of the cells expressing TRIM29. In the nude mouse experiment, the effect of the expression level of TRIM29 on gastric cancer cells was studied by analyzing the tumorigenesis of TRIM29 cells. Method 1. 38 cases of gastric adenocarcinoma treated in our hospital from March 2010 to January 2015 were collected, divided into neoadjuvant chemotherapy group (16 cases) and direct operation group (22 cases). To compare the expression of 1nRNA and the protein level of TRIM29 in the above specimens, the reason was analyzed. The expression levels of TRIM29 mRNA and protein were detected in different gastric cancer cell lines. After transfection of siRNA plasmids, the expression levels of TRIM29, P53 and B-catenin were detected by Real time qRT-PCR and Western blot. The cell doubling time was detected by MTT method and the growth curve was drawn. Flow cytometry was used to analyze the distribution of cell cycle before and after interference. TRIM29 overexpressing gastric cancer cells were selected, siRNA plasmid was transfected, transplanted in nude mice, the size and growth of transplanted tumor were observed, and the expression level of TRIM29 was detected. Result 1. The results of Real-time qRT-PCR and Western-blot showed that the expression of TRIM29 mRNA and protein in the positive lymph node specimen was significantly higher than that of normal gastric mucosa and negative lymph node (P <0.001). In both the direct surgical group and the neoadjuvant chemotherapy group, the mean survival time of TRIM29 expression-positive patients was significantly lower than that of patients with negative expression of TRIM29 (Log-systemx2 = 4.068; P = 0. 034; Log-systemx2 = 7. 487; P = 0. 006). The expression level of mRNA after neoadjuvant chemotherapy in TRIM29 patients was significantly lower than that before chemotherapy. The levels of nRNA and protein in TRIM29 in different gastric cancer cell lines were increased. The expression of p53 was down-regulated in different gastric cancer cell lines with positive expression of TRIM29, while B-catenin showed abnormally high expression. After RNA interference, the expression level of TRIM29mRNA and protein in gastric cancer cell line transfected with siRNA plasmid was decreased, which was significantly lower than that of transfected blank plasmid. The expression level of p53 mRNA and its protein was significantly higher than that before RNA interference, and the expression level of B-catenin mRNA and its protein was significantly lower than that before RNA interference. Compared with RNA interference, the proliferation ability of gastric cancer cell line induced by TRIM29 was significantly decreased after RNA interference. The expression of TRIM29 before transfection of siRNA plasmid showed metastatic tumor within 60 days under the subcutaneous growth of 5 nude mice, and the tumor diameter was 0.4 ~ 1. 9cm. After the siRNA plasmid was transfected, the expression of TRIM29 showed solid tumors in 4 nude mice, and the diameter was 0. 1-0. 5cm (P0.05). The expression of TRIM29mRNA and protein level before siRNA plasmid transfection was significantly higher than that of siRNA plasmid. Conclusion 1. TRIM29 mRNA and protein expression increased significantly in patients with gastric cancer, and the survival time of TRIM29 positive patients was shorter and the prognosis was worse. Neoadjuvant chemotherapy can affect the expression level of TRIM29 to some extent. The ability of TRIM29 to promote the proliferation of gastric cancer cells was further demonstrated by experiments in nude mice.
【學(xué)位授予單位】:鄭州大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2016
【分類號(hào)】:R735.2
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