RNA干擾對HepG2細(xì)胞AFP基因表達(dá)的影響
[Abstract]:Aim: to study the effect of RNA interference (RNAi) on the expression of AFP gene in HepG2 cells and the effect of AFP inhibition on the proliferation and apoptosis of HepG2 cells. Methods: the first part of RNA interference (RNA interference RNAi) inhibition of HepG2 cells AFP gene expression method. 1. Selection of target gene sequence and construction of plasmid vector. Two target gene sequences, AFP1 and AFP2, were selected by Blast software and sequence homology analysis. Construction of plasmid Vector pGenesil-1-AFP1 (containing Green fluorescent protein coding sequence) and pGenesil-2-AFP2.2. HepG2 cells were transfected with cationic liposome META/ plasmid pGenesil-1-AFP1 in different dosages and concentrations. The transfection efficiency was observed by fluorescence microscope, and the changes of the amount of AFP in the supernatant of cell culture were detected. The optimal ratio of cationic liposome META/ vector pGenesil-1-AFP1 was selected. The second part is the effect of RNA interference on the expression of AFP gene in HepG2 cells. 1. Transfection reagent METAFECTENE/ plasmid vector mixture prepared and transfected cells. 2. Microparticle chemiluminescence immunoassay was used to detect the content of AFP in the supernatant of culture supernatant for 72 hours after transfection. Indirect immunocytochemical technique was used to observe the expression of AFP gene in the cells of the treatment group and the control group, and to understand the inhibitory effect of pGenesil-AFP-siRNA on the expression of AFP at the cellular level. The third part is the effect of siRNA on the proliferation and apoptosis of HepG2 cells by inhibiting the expression of AFP. MTT colorimetric method was used to detect, DNA Fragmentation and the intracellular cAMP level was measured. Results: 1. The optimal ratio of cationic liposome META/ plasmid vector pGenesil-1-AFP1 transfection complex was 8 渭 l: 2.5 渭 g. 2. Compared with the control group, the AFP content of the experimental group transfected with pGenesil-1-siAFP1 and pGenesil-2-siAFP2 decreased significantly (P0.01). The content of AFP in pGenesil-1-siAFP1 group was significantly lower than that in pGenesil-2-siAFP2 group. 3. No apoptosis was observed by DNAFragmentation in the experimental group of pGenesil-1-siAFP1, but MTT colorimetric assay showed that the experimental group of siRNA-AFP1 had obvious inhibitory effect on cell proliferation, and the highest inhibition rate was 51.35%. The intracellular cAMP concentration (15.64 渭 mol/L) in the experimental group was significantly lower than that in the control group (P0.01). Conclusion: RNA interference technique can effectively inhibit the expression of AFP gene in HepG2 cells. This method not only has a certain significance for studying the function of AFP gene in vitro, but also provides a basis for further study on the application of RNA interference technique in antitumor therapy.
【學(xué)位授予單位】:山西醫(yī)科大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2005
【分類號】:R363
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