非小細(xì)胞肺癌侵襲轉(zhuǎn)移中Wnt通路差異基因表達(dá)研究
[Abstract]:Part I Screening of NSCLC metastasis-related genes associated with Wnt pathway by whole gene expression profiling: The purpose of this study was to screen differentially expressed genes for NSCLC metastasis by using whole gene expression profiling technology, search for Wnt pathway-related metastasis genes and analyze their gene functions, and study the invasion and metastasis mechanism of non-small cell lung cancer. Methods: Lung cancer tissues were collected from the thoracic surgery of Qilu Hospital of Shandong University from April 2014 to October 2014. The tissues were put into cryopreservation tube immediately after being detached and frozen in liquid nitrogen tank for 2-3 hours within 10 minutes. Materials. None of the patients underwent preoperative radiotherapy or chemotherapy, and were confirmed to be primary non-small cell lung cancer by pathology. Six patients with lymph node metastasis were selected as experimental group, six patients without lymph node metastasis as control group. RNA was extracted by Trizol method, and RNA quantity and quality were evaluated by NanoDrop ND-1000. RNA integrity was evaluated by standard denaturing gel electrophoresis. Using Agilent human 4 *44K gene expression microarray v2, the whole genome expression profiles of the experimental group and the control group were tested. The chips were obtained by using Agilent Feature Extraction software, and the original data were obtained. The original data were standardized by using GeneSpring GX v12.1 software, and the gene ontology (GO) was performed. Results: 1. RNA quality control: OD values of DNA chip samples showed that A260/A280 were between 1.8 and 2.1. Agarose gel electrophoresis showed that 28SrRNA and 18SrRNA bands were clear, RNA purity and integrity were good. Cluster analysis: Cluster analysis showed that there was a significant difference between metastatic group and non-metastatic group. Samples of the same group could appear in the same cluster by clustering. Samples clustered in the same cluster had similar biological properties, suggesting that the chip test had a certain repeatability and the results were reliable. Methods 11975 differentially expressed genes, 5812 up-regulated genes and 6163 down-regulated genes were screened. GO analysis showed that the differentially expressed genes were mainly involved in multicellular biological processes, signal transduction, G protein-coupled receptor activity, extracellular matrix and other functional groups. Cycle, PI3K-Akt signaling pathway, Wnt pathway, p53 signaling pathway and so on. 6. Screening of Wnt pathway differential genes: Screening of Wnt pathway related to NSCLC transfer differential genes a total of 34, including 18 up-regulated genes, 16 down-regulated genes, involving cyclin genes, protein kinase C genes, convolution family receptor genes, transcription factor genes, GO analysis was obvious. These genes are involved in protein binding, cytoplasmic membrane, intracellular signal transduction, convolution protein binding, positive regulation of cell proliferation, and activity of specific DNA binding transcription factors. Functional groups, MAPK, Wnt, p53 and other signal transduction pathways. 2. Differential genes related to Wnt pathway are involved in specific sequence DNA binding transcription factor activity, intracellular signal transduction, positive regulation of cell proliferation and other biological processes, but need to be further verified. The second part is related to metastasis of non-small cell lung cancer associated with Wnt pathway. Objective: In order to verify the reliability of the microarray and guide the next research direction, real-time quantitative polymerase chain reaction (RT-qPCR) was used to detect and analyze the target gene. CCND2, PRKCA and NFATC1 were selected as the target genes from the 34 differentially expressed genes. The 12 cases of lung cancer cryopreserved tissues, 6 cases of lymph node metastasis group, 6 cases of experimental group and 6 cases of non-lymph node metastasis group were used as control group. RNA extraction method and quality detection method were the same. Real-time quantitative PCR was performed on the target genes and housekeeping genes of experimental group and control group respectively, and the concentration dilution DNA standard curve was drawn to calculate the relative content of the target genes. There was no significant difference between the two groups (t = 0.4539, P 0.05). Conclusion: 1. The results of CCND2, PRKCA, NFATC1 real-time quantitative PCR were consistent with those of expression microarray, and the whole gene expression microarray technology could achieve high throughput. The differentially expressed genes. 2, CCND2, PRKCA and NFATC1 are closely related to the occurrence and development of human tumors. They are up-regulated in the metastasis of lung cancer, indicating that they have important research value in the invasion and metastasis of lung cancer.
【學(xué)位授予單位】:山東大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類號(hào)】:R734.2
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