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- W2074906046 abstract "Liver-specific gene knockdown cannot be achieved by short hairpin RNA (shRNA) generated by RNA polymerase III promoter. Here we constructed, modified and evaluated apolipoprotein A-I (ApoA-I) promoter-driven shRNA expression vectors against human telomerase reverse transcriptase (hTERT) in SMMC-7721 cells. The roles of the cis-acting hammerhead ribozyme and the specific pausing site MAZ, the liver-specific promoter ApoA-I, as well as SV40 and CMV enhancers were first individually evaluated, and then they were incorporated to construct a liver-specific shRNA expression plasmid against hTERT, and the inhibitory effects on hTERT were examined in SMMC-7721 cells. The results showed that the introduction of the cis-acting hammerhead ribozyme and the specific pausing site MAZ did not change gene knockdown efficiency significantly, but eliminated the off-target effect. Green fluorescent protein (GFP) expressing plasmid under the control of ApoA-I promoter can produce liver-specific GFP expression, but at a much lower level compared to the CMV promoter. The CMV or SV40 enhancer-modified ApoA-I promoter caused a four or two folds increase in mRNA expression of GFP relative to ApoA-I alone, respectively. The liver-specific shRNA expression plasmid against hTERT under the control of CMV enhancer-modified ApoA-I promoter with the sequences of the cis-acting hammerhead ribozyme and MAZ, induced significant inhibitory effect on hTERT at both mRNA and protein levels in SMMC-7721 cells. Therefore, liver-specific gene therapy is made possible by utilizing shRNA expression vector under the control of CMV enhancer-modified ApoA-I promoter." @default.
- W2074906046 created "2016-06-24" @default.
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- W2074906046 date "2011-01-01" @default.
- W2074906046 modified "2023-09-25" @default.
- W2074906046 title "Construction, modification and evaluation of apolipoprotein A-I promoter-driven shRNA expression vectors against hTERT" @default.
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- W2074906046 doi "https://doi.org/10.1016/j.plasmid.2010.11.001" @default.
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