Abstract
Regulated gene delivery systems are usually made of two elements: an inducible promoter and a transactivator. In order to optimize gene delivery and regulation, a single viral vector ensuring adequate stoichiometry of the two elements is required. However, efficient regulation is hampered by interferences between the inducible promoter and (i) the promoter used to express the transactivator and/or (ii) promoter/enhancer elements present in the viral vector backbone. We describe a single AAV vector in which transcription of both the reverse tetracycline transactivator (rtTA) and the transgene is initiated from a bidirectional tetracycline-responsive promoter and terminated at bidirectional SV40 polyadenylation sites flanking both ITRs. Up to 50-fold induction of gene expression in human tumor cell lines and 100-fold in primary cultures of rat Schwann cells was demonstrated. In addition an 80-fold induction in vivo in the rat brain has been obtained. In vitro, the autoregulatory vector exhibits an induced expression level superior to that obtained using the constitutive CMV promoter. Although extinction of the transgene after removal of tetracycline was rapid (less than 3 days), inducibility after addition of tetracycline was slow (about 14 days). This kinetics is suitable for therapeutic gene expression in slowly progressive diseases while allowing rapid switch-off in case of undesirable effects. As compared to previously described autoregulatory tet-repressible (tetOFF) AAV vectors, the tet-inducible (tetON) vector prevents chronic antibiotic administration in the uninduced state.
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Acknowledgements
We thank Drs Marc Peschanski, Jude Samulski and Thomas McCown for helpful suggestions, Dr M Azarkan for his help in fluorimetric analysis, Dr David Blum for his help in image analysis and Olivier Bockstael and Catherine Melas for technical help. AC and EL are recipients of predoctoral fellowships from the Belgian National Research Foundation (FNRS-Télévie). Plasmid pAC1: patent pending. This research was supported by a Biotech European Community grant no. BIO-CT97-2207, by grants of the Belgian National Research Foundation (FNRS-FRSM no. 3.4540.96 and no. 3.4565.98) and by grants from the Société Générale de Belgique, from ‘Bruxelles-Capitale’ and from the Belgian Loterie Nationale.
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Chtarto, A., Bender, H., Hanemann, C. et al. Tetracycline-inducible transgene expression mediated by a single AAV vector. Gene Ther 10, 84–94 (2003). https://doi.org/10.1038/sj.gt.3301838
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DOI: https://doi.org/10.1038/sj.gt.3301838
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