DAL-1調(diào)控非小細(xì)胞肺癌EMT的分子機(jī)制及其生物信息學(xué)研究
[Abstract]:Background: at present, lung cancer is the highest incidence and death rate of malignant tumors in the world, of which Non-small cell lung cancer (NSCLC) accounts for the poor prognosis of 80%. in the late 80%. of all lung cancers. Invasion and metastasis are the main causes of death. Therefore, the molecular mechanism of NSCLC metastasis and invasion is studied and the related molecular targets are explored. The purpose of this study is to focus on the mechanism of the DAL-1 gene in the invasion and migration of NSCLC so as to provide a new target and theoretical basis for the clinical treatment of NSCLC. Research methods: 3 specific DAL-1 shRNA expression plasmids, based on the human DAL-mRNA coding sequence, are designed and incorporated into the target DAL-1. PGPU6/GFP/Neo-sh710, sh1329, sh1436) and negative control plasmids (pGPU6/GFP/Neo-shNC). The recombinant plasmid was transfected into the NCI-H460 cell line by liposome mediated method, and the stable transfected cells were cloned. The expression level of DAL-1 gene was detected by Western blot and RT-PCR, and the expression inhibition rate.MTT method was used to detect the NCI-H460 of the transfected NCI-H460. Proliferation level, Transwell cell detection of invasion and migration ability, discuss the invasion and migration level after cell inhibition of DAL-1. Based on R language and using Bioconductor as the programming environment, a variety of mature software packages are used to design a system for analyzing and mining gene chip data. Download the Affymetrix oligonucleotides that have been uploaded in GEO. Because of the chip, including the original data GSE33532 of human NSCLC, the original data of the gene chip were carried out including data downloading, standardization, quality control, screening and analysis of differential genes, GO analysis, clustering and pathway summary, further analysis of gene regulation network and molecular interaction. Research results: RNAi silencing of 1.DAL-1 gene. The effect affected NCI-H460 cells to design and construct the pGPU6/GFP/Neo-DAL-1shRNA plasmid and negative control plasmid pGPU6/GFP/Neo-shNC targeting DAL-1, to establish DAL-L stable silent cells NCI-H460-sh1329 and negative control NCI-H460-shNC cells. Compared with negative control and blank plasmid (NCI-H460/ET), the inhibition rate of DAL-1 cells in NCI-H460-sh1329 group The detection of 88.17% and Western blot detected by RT-PCR method also obtained similar results. Therefore, it is believed that sh1329 effectively inhibits the expression of DAL-1, which is called the DAL-1 expression inhibition rate of nci-h460-sh1329.nci-h460-shnc and nci-h460/et and has no significant change in the effect of.2. inhibition DAL-1 on NCI-H460 invasion and migration The proliferation ability of the cells was detected by the method. We found that the proliferation of nci-h460-sh1329 was faster than that of the negative control group nci-h460-shnc and the empty plasmid transfection group nci-h460/et (P0.05). The invasion and migration ability of the cells was detected by the basement membrane invasion test. We found that the NCI-H460 was compared with the negative control group, nci-h460-shnc and empty plasmid transfection nci-h460/et, NCI-H460. The invasion and migration of -sh1329 cells increased significantly (P0.05) the deletion or overexpression of.3.dal-1/4.1b changed the expression of EMT transfer markers by transfecting shRNA plasmids into the eukaryotic cells to inhibit the expression of dal-1/4.1b and the expression of E-cadherin and beta -catenin, while the expression of vimentinb increased; conversely, the overexpression of dal-1/4.1b was in phase. The inverse effect of.4.tgf- beta induced expression of dal-1/4.1b by tgf- beta induced mRNA and protein expression level of dal-1/4.1b significantly increased.5.nsclc bioinformatics analysis to screen 49 differentially expressed genes in the gse33532 data group, and many of these genes have proved to be closely related to NSCLC in the experiment, including vascular smooth muscle. The cell contraction pathway is the key regulating unit of NSCLC. Conclusion: the dal-1shrna expression plasmid (pgpu6/gfp/neo-sh710, sh1329, sh1436) and negative control plasmid (pgpu6/gfp/neo-shnc) were successfully constructed, and a stable DAL-1 silencing nci-h460-sh1329 and negative control nci-h460-shnc cell line were established. The proliferation, migration and invasion of NCI-H460 were inhibited after DAL-1. The level of DAL-1 can inhibit the migration and invasion of non-small cell lung cancer. It has successfully constructed a bioinformatics system to analyze the differential genes between NSCLC and normal lung tissue as a key pathway. The innovation of this study is: 1. target to DAL-1 to construct pgpu6/gfp/neo-dal-1shrna surface vector and design siRNA sequence. Experimental results say SiRNA can effectively inhibit the DAL-1 expression of NCI-H460. By constructing a DAL-1 stable cell line, it can provide a suitable model cell for exploring the mechanism of DAL-1 gene in NSCLC; 2. the function level of DAL-1 in NCI-H460 proliferation, migration and invasion, DAL-1 and NSCLC metastasis are analyzed by RNAi technique and the relationship between DAL-1 and NSCLC metastasis and so on The mechanism of its action is discussed to provide a theoretical basis for further exploration of the production and development of NSCLC..3. is used to analyze the gene data of GSE33532 in GEO by bioinformatics method, and the key regulatory unit vascular smooth muscle cell contraction pathway is found through differential gene and pathway analysis, which can further study the mechanism of molecular action in lung cancer in the future. For the foundation.
【學(xué)位授予單位】:南昌大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2016
【分類號】:R734.2
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