B-Myb基因在肺癌中的作用及分子機(jī)制的研究
[Abstract]:B-Myb is a member of the highly conserved transcription factor Myb family and is widely expressed in proliferating cells and plays an important role in the process of cell cycle. Some studies have found that B-Myb is highly expressed in many cancer cells, such as breast cancer, hepatocellular carcinoma, and neuroblastoma. This suggests that B-Myb is in the development of cancer. So far, the expression and mechanism of B-Myb in lung cancer are not clear. Therefore, this paper mainly studies the expression level of B-Myb in lung cancer tissue samples and its effect on lung cancer cell proliferation, migration and invasion, tumor formation, and explore its molecular mechanism. The first part of B-Myb overexpression on lung cancer The effect and mechanism of cell proliferation, migration, invasion and tumor formation: 1. study the relationship between the expression of B-Myb in lung cancer tissue and the clinicopathological features of tumor.2. detection of B-Myb overexpression on the proliferation, cell cycle, migration and invasion, and the effect of.3. on the proliferation of lung cancer cells and promoting the proliferation of lung cancer cells, migration and migration of lung cancer cells The molecular mechanism of invasion and tumor formation. Methods: 1. the expression of B-Myb in lung cancer tissues and normal lung tissues was detected by Q RT-PCR, Western blot and IHC. The relationship between the expression of B-Myb in lung cancer tissues and the clinicopathological features of the tumor was statistically analyzed.2. using the lentivirus infection method to transfect the target gene B-Myb to lung cancer. In the cell, B-Myb overexpressed cell model was established; Q RT-PCR and Western blot were used to detect the expression of M RNA and protein of B-Myb and target genes; CCK-8 detection of cell proliferation; FCM detection of cell cycle; scratch test and Transwell detection of cell migration and invasion; nude mice tumor testing detection of lung cancer cells in vivo tumorigenicity.3.RNA-seq detection of lung cancer cell lines 99 B-Myb overexpressed group samples and control group samples, GO enrichment analysis and pathway enrichment analysis were used to screen differentially expressed genes and related signaling pathways. Results: 1. detection of M RNA expression level of B-Myb in 40 cases of lung cancer patients and 7 normal lung tissue C DNA chips, and 69 cases of lung cancer and 3 normal lung tissue chips by IHC The protein expression level of middle B-Myb showed that the expression level of M RNA and protein of B-Myb in lung cancer tissues was significantly higher than that of normal lung tissue. The protein expression of B-Myb was mainly located in the cytoplasm, and the expression of B-Myb was closely related to the size of tumor, lymph node metastasis and metastatic carcinoma. Further detection of the 6 cell line of lung cancer H12 99, A549, H157, H446, H524 and H460 B-Myb m RNA expression level. The results showed that B-Myb M protein expression in lung cancer cells H1299 and A549 was relatively low, and the overexpressed cell model was successfully established, and the overexpressed group was at least 4 times higher than the control group. The expression of overexpression promoted the proliferation of lung cancer cells, and the results of FCM detection showed that the number of S phase cells in the B-Myb overexpression group was significantly increased and the number of G1 cells decreased significantly. The results of scratch test and Transwell migration showed that B-Myb overexpression promoted the migration of lung cancer cells; the result of Transwell invasion showed that the over expression of B-Myb promoted lung cancer cells. The results of the in vivo experiment showed that B-Myb overexpression promoted the tumor formation of.3.RNA-seq in lung cancer cells. The results showed that B-Myb overexpression induced the differential expression of 390 genes, of which 300 genes were up-regulated, and 90 gene.GO enrichment analysis showed that the function of differentially expressed genes was mainly related to the expression of down regulation. The results of extracellular matrix, growth factor, and cell development related to.Pathway enrichment analysis showed that the main signaling pathways included cell adhesion factor pathway, PI3K-Akt signaling pathway, cancer pathway and Ras signaling pathway. We expressed genes CCNA1, COL11A1, COL6A1, FN1, MMP2, NID1, FLT4, SPARC, INSR, INSR, INSR, INSR, SPARC, and CCNA1 The trend of differential expression was consistent with the results of RNA-seq data analysis. Further western blot analysis showed that B-Myb overexpression significantly increased the level of phosphorylation of ERK and Akt, and could activate ERK and Akt signaling pathways. Conclusion: 1. the B-Myb M levels and protein levels in lung cancer tissues are significantly higher than those of normal lung tissues. The protein expression of 1. lung cancer tissues is significantly higher than that of normal lung tissue. It is mainly located in the cytoplasm, and the expression of B-Myb is closely related to the size of tumor, lymph node metastasis and metastatic carcinoma. In vitro,.2. experiments show that overexpression of B-Myb can promote cell proliferation, cell cycle process and migration invasion. In vivo experiments show that B-Myb overexpression can improve the tumor formation ability of lung cancer cells.3.RNA-seq The results of detection analysis showed that the differentially expressed gene functions were mainly related to extracellular matrix, growth factor, cell development process, and Q RT-PCR detection for some differentially expressed genes. The trend of differential expression was consistent with the results of RNA-seq data analysis. Pathway enrichment analysis showed that the main signal pathways included cell adhesion factors. The pathway, PI3K-Akt signaling pathway, cancer pathway and Ras signaling pathway.Western blot analysis showed that B-Myb overexpression significantly increased the level of ERK and Akt phosphorylation, activated ERK and Akt signaling pathways, and B-Myb could promote the development of lung cancer, perhaps partly through the regulation of ERK and Akt signaling pathways. The second part interferes with lung cancer. Effects and mechanisms of cell proliferation, migration and invasion and tumor formation: 1. detection of the effects of B-Myb interference on proliferation, cycle, migration and invasion, and tumor formation of lung cancer cells..2. preliminarily clarifies the molecular mechanism of B-Myb interference to inhibit the proliferation, migration and invasion of lung cancer cells and the formation of tumor. Methods 1. use lentivirus infection and transient transformation. The staining method transfected the interference sequence of the target gene B-Myb into the lung cancer cells and established the B-Myb interference cell model; Q RT-PCR and Western blot detected the B-Myb and the expression of M RNA and protein of the target gene; CCK-8 detection of cell proliferation; FCM detection of cell cycle; scratch and Transwell detection of cell migration and invasion; tumor formation detection in nude mice. .2.RNA-seq detection of H1299 B-Myb interference group and control group samples, GO enrichment analysis and pathway enrichment analysis screened differentially expressed genes and related signaling pathways. Results: 1. the B-Myb interference model of H1299 and A549 in lung cancer cells was successfully established, and B-Myb interference efficiency was more than 60%; CCK-8 results showed that B-Myb interference inhibited lung cancer cells. The results of FCM detection showed that the number of S cells decreased and the number of G1 cells increased significantly after B-Myb interference, and the results of scratch and Transwell migration showed that B-Myb interference inhibited the migration of lung cancer cells; the results of Transwell invasion showed that B-Myb interference inhibited the invasion of lung cancer cells; in vivo experimental results showed that B-Myb interference inhibited lung cancer. The detection and analysis of the tumor formation of.2.RNA-seq showed that B-Myb interference induced 13362 differentially expressed genes, including 6343 gene expression up-regulated, 7019 gene expression down-regulation.GO enrichment analysis showed that the differentially expressed genes were mainly involved in regulating cell signal transduction, cell cycle, cell proliferation, cell apoptosis and migration invasion. MAPK signaling pathway, apoptosis and cell cycle related signal pathways were mainly analyzed by Pathway enrichment analysis. We detected Q RT-PCR in some differentially expressed genes COL11A1, FLT4, SPARC, IDH2, PDK3 and IGFBP3. The trend of differential expression was consistent with that of RNA-seq data analysis. Conclusion: 1. in vitro experiments showed that B-Myb interference could be suppressed. The proliferation, migration and invasion of lung cancer cells and the decrease of S phase cells; in vivo experiments showed that B-Myb interference could reduce the tumor formation ability of lung cancer cells by.2.RNA-seq detection and analysis showed that extracellular matrix, growth factor, and cell development process were all down regulated by different levels of gene expression. Q RT- for some differentially expressed genes PCR detection, the trend of differential expression is consistent with the results of RNA-seq data analysis. The results of pathway enrichment analysis show that the main signaling pathways include MAPK signaling pathway, apoptosis and cell cycle related signaling pathways.
【學(xué)位授予單位】:重慶醫(yī)科大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2017
【分類號(hào)】:R734.2
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