Chk1介導(dǎo)的CCNB1高表達(dá)在結(jié)直腸癌中的作用及機(jī)制研究
[Abstract]:Colorectal cancer is one of the major malignant tumors that seriously endanger human health. The incidence and mortality of colorectal cancer rank second in female malignancies, third in male malignancies, second only to lung cancer and breast cancer. With the development of Medical Science in recent years, the level of treatment for colorectal cancer has also been greatly improved. At present, the incidence of colorectal cancer has been related to the occurrence of colorectal cancer. The development and progression of colorectal cancer is a complex process, not only related to external factors such as environment, diet and living habits, but also a complex process involving multiple stages, steps and genes. Cyclin B1 (CCNB1) is an important member of the cyclin family and an important cell related to G2/M detection sites in cells. Cyclin-dependent kinase-1 (CDK1) is an important regulator of cell cycle. It regulates and forms a complex with cyclin-dependent kinase-1 (CDK1) to phosphorylate the substrate, initiates the cell from G1/S phase to G2/M phase, and promotes mitosis. Inhibition of CCNB1 expression has been shown to make breast cancer cells more sensitive to chemotherapy. In addition, studies have shown that wild-type P53 inhibits CCNB1 transcription through SP1 transcription factors in tumor cells. The expression of CCNB1 was low in HCT116 p53+/+ cells and high in HCT116 p53-/-cells. These studies suggest that CCNB1 may play a key role in tumor development. However, the specific functional mechanism of CCNB1 in colorectal cancer remains unknown. Most cancers are thought to be highly dependent on cells. The abnormal expression of cyclic checkpoint kinase 1 (Chk1) and CCNB1 were previously used as biomarkers for predicting the efficacy of Chk1 inhibitors. At present, there are many studies on the expression mechanism and clinical significance of CCNB1 and Chk1 in colorectal cancer, but whether there is a correlation between them and which pathway they share. In this study, we examined the expression of CCNB1 and Chk1 in colorectal cancer and normal colorectal tissues, and analyzed the correlation between them. Chk1 was proved to be a positive regulator of CCNB1 by cell function test in vitro and in vivo and in vitro. The purpose of this study is to reveal the new mechanism of the occurrence and development of colorectal cancer and to provide solid and reliable experimental evidence and theoretical support for exploring new strategies for the prevention and treatment of colorectal cancer. Part I: Expression and function of CCNB1 in colorectal cancer Objective: To verify the elevated expression of CCNB1 in colorectal cancer tissues and to determine the effect of CCNB1 on the proliferation, cycle and apoptosis of colorectal cancer cells. The expression levels of CCNB1 mRNA and protein in normal tissues and adjacent tissues were measured. P53-wild HCT116, P53-mutant SW480 and P53-null HCT116 cell lines were selected as experimental subjects. CCNB1-specific siRNA or negative control siRNA were transfected by cell transfection technique. The proliferation of tumor cells was detected by MTT assay, and the cell cycle was detected by PI single staining. Results: 1. The expression of CCNB1 in colorectal cancer tissues was significantly higher than that in adjacent normal tissues. 2. In colorectal cancer cell lines P53-wild HCT116, SW480 and P53-null HCT116, the expression of CCNB1 was inhibited. Inhibition of CCNB1 expression in P53-wildHCT116 cells can promote early apoptosis of tumor cells by regulating the p53/B ax pathway, and inhibit the expression of CCNB1 in P53-null HCT116 cells. Conclusion: 1. The expression of CCNB1 in colorectal cancer tissues increased significantly. 2. The down-regulation of CCNB1 expression can inhibit the proliferation of colorectal cancer cells, induce G2/M phase arrest of cell cycle and promote apoptosis of tumor cells, suggesting that CCNB1 plays a carcinogenic role in the development of colorectal cancer. High expression of CCNBl in colorectal cancer depends on the expression of cell cycle checkpoint kinase 1 (Chkl). To determine that Chkl is the upstream regulatory molecule of CCNBl and to reveal the mechanism of Chk1 in colorectal cancer. Methods: First, the expression of Chk1 mRNA was detected by qRT-PCR in colorectal cancer tissues and normal tissues adjacent to the cancer, and Western blot was used to detect the expression of Chk1 mRNA. Secondly, siRNA was used to specifically interfere with the expression of Chkl in colorectal cancer cells, Western blot was used to detect the expression of CCNB1 protein, MTT assay was used to detect the proliferation of tumor cells, and the role of Chkl in colorectal cancer and the regulatory role of CCNB1 were clarified. The expression level of CCNB1 in colorectal cancer tissues was significantly higher than that in adjacent normal tissues, and was positively correlated with the expression level of CCNB1. 2. Interference with the expression of Chk1 in colorectal cancer cells could inhibit the protein level of CCNB1 and inhibit cell proliferation. Molecule. Part III. Lentiviral-mediated inhibition of CCNB1 shRNA on colorectal cancer xenografts in nude mice Objective: To investigate the regulatory effect of continuous inhibition of CCNB1 expression on the growth of transplanted tumors in nude mice. HCT116 and SW480 cell lines were screened by antibiotics to obtain stable low-expression CCNB1 cell lines. The expression level of CCNB1 was detected by Western blot to determine the screening efficiency. The expression of CCNB1 was detected by immunohistochemical staining and the expression of CDC25C, CDK1, p53 and Bax was detected by Western blot. Results: 1. Inhibition of CCNB1 expression could inhibit the growth of transplanted tumor in nude mice. 2. Inhibition of CCNB1 expression in transplanted tumor could inhibit the downstream cells of CCNB1. The expression of cyclin-associated proteins CDC25C and CDK1 was down-regulated, and the expression of apoptosis-related proteins p53 and Bax was down-regulated in HCT116 transplanted tumors. Conclusion: Inhibition of CCNB1 in nude mice can inhibit the growth of colorectal cancer xenografts, which is consistent with the study in vitro.
【學(xué)位授予單位】:浙江大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2016
【分類號(hào)】:R735.34
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