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- W3140763959 abstract "AIM:To investigate the effects of osteopontin(OPN)gene expression knockdown on colon cancer Lovo cells in vitro.METHODS:Four candidate small interfering RNA(siRNA)constructs targeting the OPN gene and a scrambled control sequence(NC-siRNA)were synthesized and inserted into a pGPU6/GFP/Neo expression vector.After confirmation by restriction enzyme digestion and DNA sequencing,the recombinant plasmids were subsequently transfected into a human colon cancer cell line(Lovo)using a liposome transfection method.Stably transfected cells were maintained with G418 selection and referred to as Lovo-OPN-1,-2,-3,-4,and Lovo-NC cells.Knockdown efficiency of each of the four siRNA constructs was determined by realtime reverse transcription polymerase chain reaction assays and western blotting,and the construct with the most effective silencing was used for subsequent experiments.Cell proliferation,adhesion,and Matrigel invasion assays were performed to analyze the effects of OPN knockdown in stably transfected Lovo cells.The levels of four angiogenic factors,namely vascular endothelial growth factor(VEGF),matrix metalloproteinase(MMP)-2,MMP-9 and urokinase plasminogen activator were detected by enzyme-linked immunosorbent assays(ELISA).RESULTS:Recombinant vectors containing OPNspecific and scrambled siRNA sequences were successfully constructed and stably transfected into Lovo cells.Compared with the control Lovo and Lovo-NC cells,the levels of OPN mRNA and protein expression in LovoOPN-1,-2,-3,and-4 were significantly reduced(all P<0.05),with the most efficient reduction observed in Lovo-OPN-4 cells(P<0.05).Relative to untransfected Lovo cells,OPN mRNA expression levels in Lovo-NC and Lovo-OPN-4 cells were 1.008±0.067 and 0.160±0.023,respectively.The relative OPN protein expression levels in Lovo,Lovo-NC,and Lovo-OPN-4 cells were 3.024±0.211,2.974±0.630,and 0.121±0.008,respectively.Moreover,transfection with the scrambled sequence had no effect on the expression of OPN.After24,48,72,and 96 h of cultivation,absorpti" @default.
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- W3140763959 date "2014-01-01" @default.
- W3140763959 modified "2023-09-27" @default.
- W3140763959 title "Osteopontin knockdown suppresses the growth and angiogenesis of colon cancer cells" @default.
- W3140763959 hasPublicationYear "2014" @default.
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