PB3A干預SW480大腸癌細胞中miRNAs及其靶基因表達的意義
[Abstract]:PB3A is a flavonoid monomer isolated from propolis. It has been shown to inhibit the proliferation and induce apoptosis of colorectal cancer cells, cervical cancer cells, leukemia cells, liver cancer cells, lung cancer cells and other cancer cells. However, the effect of PB3A on the expression of microRNAs in cancer occurrence and development has not yet been clarified. In this study, we investigated the effect of propolis flavonoid PB3A on the expression profile of microRNAs in colorectal cancer cells, and sought to differentially express microRNAs closely related to the occurrence and development of colorectal cancer, thus providing new methods and ideas for screening drug targets for the diagnosis and treatment of colorectal cancer. The proliferation of SW480 colorectal cancer cells was inhibited by PB3A at different time (24h, 48h, 72h). The results showed that the survival rate of SW480 colorectal cancer cells decreased with the increase of PB3A concentration and the inhibitory effect of PB3A on the proliferation of SW480 colorectal cancer cells increased with the prolongation of action time. PB3A inhibited the proliferation of SW480 colorectal cancer cells in a dose-and time-dependent manner. 00ug/m L PB3A, 24h) treated SW480 cells, extracted total RNA for real-time fluorescence RT-PCR assay to verify the authenticity and reliability of the microarray expression profile. The results showed that of the 12 verified microRNAs, 10 microRNAs including mi R-22-5p, mi R-211-5p, mi R-198, mi R-769-3P, microNA-4321, microNA-204-5P, microNA-4326, microNA-219a-2-3P, mi R-4697-3p, and MI R-142-3p were detected. There was no significant difference in the expression of MI R-761 (P 0.05). The differential expression of MI R-642a-5P in SW480 cells was contrary to that of micro RNA chip. The next step was to select mi R-4326 and synthesize mir-4326 mimic and mir-4326 mimic according to the results of micro RNA qRT-PCR. MiR-4326 was successfully transfected into SW480 cells with unrelated sequence. The expression of MI R-4326 in mimic transfection group was significantly higher than that in unrelated sequence transfection group (P 0.05). The results of microarray and qRT-PCR showed that the expression of MI R-4326 in mimic transfection group was significantly higher than that in unrelated sequence transfection group (P 0.05). The target genes of differentially expressed microRNAs with the same trend were predicted and analyzed by functional enrichment. Twelve databases including MIRWalk, Microt4, and MIRanda were used to predict the target genes of differentially expressed microRNAs. The results showed that there were 575 target genes in MIR-22-5p, 896 target genes in MIR-802, 906 target genes in MIR-296-5p, and 906 target genes in MIR-18a-5p. There are 762 target genes, 209 target genes for MI R-3064-5p, 1730 target genes for MI R-211-5p, 728 target genes for MI R-769-3P, 7 target genes for miNA-4321, 1693 target genes for miNA-204-5P, 299 target genes for miNA-4326, 626 target genes for MI R-219a-2-3P, 115 target genes for MI R-4697-3p, 534 target genes for MI R-142-3p, and R-434 target genes for MI R-432-5P. There were 859 target genes in 198. Differentially expressed microRNAs target gene GO enrichment analysis showed that these 14 microRNAs were involved in many cellular components formation, molecular functions and biological processes by regulating their target genes. Among them, the most annotated target genes were biological processes, so these microRNAs may be involved in a variety of biological processes by regulating them. MicroRNAs target genes are mainly enriched in transcription factors and copy number variation-related genes, protein kinase genes, histones and oncogenes; protein functions are associated with Ras pathway, PDGF signaling pathway, integrin signaling pathway, EGF receptor signaling pathway, angiogenesis, and FGF KEGG signaling pathway analysis revealed that these 14 microRNAs target genes were involved in tumor pathway, Wnt signaling pathway, endocytosis pathway, axonal guidance, chronic myeloid leukemia, MAPK signaling pathway, prostate cancer, insulin and so on. Signal pathways, such as glioma, melanogenesis, actin cytoskeleton regulation, colon carcinogenesis, and so on. Tumor pathway, Wnt signaling pathway, MAPK signaling pathway, axon-directed pathway, and endocytosis pathway are all important pathways in cell carcinogenesis, cancer occurrence and development. The results of qRT-PCR in this study suggest that PB3A in SW480 cells is an intervention. Differentially expressed 10 microRNAs, including mi R-22-5p, mi R-211-5p, mi R-198, mi R-769-3P, microNA-4321, microNA-204-5P, microNA-4326, microNA-219a-2-3P, mi R-4697-3p, and MI R-142-3p, may play an important role in the anticancer effect of PB3A. Bioinformatics analysis suggests that the differentially expressed microNAs under the action of PB3A may involve a variety of cells. Component formation, molecular function and target genes involved in biological processes, tumor pathway, Wnt signaling pathway, MAPK signaling pathway, axon-directed pathway, endocytosis pathway and other important signaling pathways, thereby inhibiting the proliferation, invasion, migration and inducing apoptosis of colorectal cancer cells.
【學位授予單位】:新疆大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:R735.34
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