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- W2014262817 abstract "The tetracycline system has limitations in liver cells, such as toxic effects and low controllability. We generated different retroviral vectors for controlled gene expression in liver cells, in which the regulatory elements were arranged in different patterns. Only the organization of the tetracycline system in an autoregulatory loop in the sense orientation results in high retroviral titres and in tight regulation of gene expression in highly differentiated hepatoma cells. Because of the toxicity of the transactivator tTA, it was impossible to establish doxycycline-dependent stable HepG2 cell lines. To avoid sequelching-related toxicity in liver cells, we replaced tTA with new non-toxic transactivators. By using tTA2, tTA3 and tTA4, we observed tight doxycycline-dependent gene expression in 23, 49 and 45% of the isolated clones. The tTA4 vector was used to transduce hepatocytes of mice in vivo. Tight doxycycline-controllable gene regulation was also observed in the liver of mice, confirming our hypothesis that retroviral vectors with autoregulatory loops of the tetracycline system facilitate inducible gene expression in the liver in vivo. Our new retroviral vector system allows rapid isolation of controllable clones in a very high yield and should make the tetracycline system more applicable to liver-derived cells and in liver gene therapy in vivo." @default.
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- W2014262817 date "2004-02-13" @default.
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- W2014262817 title "Doxycyline regulation in a single retroviral vector by an autoregulatory loop facilitates controlled gene expression in liver cells" @default.
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- W2014262817 doi "https://doi.org/10.1093/nar/gnh034" @default.
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