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Regulated and prolonged expression of mIFNα in immunocompetent mice mediated by a helper-dependent adenovirus vector

Gene Therapy volume 8, pages 1817–1825 (2001)Cite this article

Abstract

A major goal in gene therapy is to develop efficient gene transfer protocols that allow tissue-specific, long-term and tightly regulated expression of the desired transgene. This objective is becoming more attainable through the co-evolution of gene transfer vectors and regulation systems. The ideal vector should efficiently transduce non-dividing cells with minimal toxicity, thus endowing the system with persistent transgene expression. The helper-dependent adenovirus vectors meet these requirements, as demonstrated in various studies in the literature. The most promising regulation system is the tet-on system, which has low basal transcriptional activity and high inducibility. To explore the regulated transgene expression in the context of a helper-dependent vector, we constructed the HD-TET-IFN vector, containing the mIFNα gene under the control of the tetracycline inducible transactivator rtTA2s-S2. Mice injected with HD-TET-IFN showed high levels of serum mIFNα only upon transcriptional activation. The transgene expression was reinducible to the same high level up to 3 months p.i., and the amount of expressed cytokine could be regulated by dosing doxycycline. Transcriptional activation of mIFNα induced by doxycycline resulted in prolonged survival and reduced liver damage in HD-TET-IFN-injected mice challenged with a lethal dose of coronavirus. Activation of antiviral genes mediated by doxycycline-dependent mIFNα expression was also observed at low HD-TET-IFN doses. The possibility of controlling gene expression by the combination of HD vectors and the latest tet-on transactivator also holds promise for studying gene function in other animal models.

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Acknowledgements

We thank S Germoni and M Aquilina for animal care, C Toniatti for critically reading of the manuscript and Domenico Lazzaro for the immunohistochemistry. We also thank J Clench for editorial assistance and G Bifolchetti for graphics.

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Authors and Affiliations

  1. IRBM P Angeletti, Rome, Italy

    L Aurisicchio, R Cortese, G Ciliberto, N La Monica & F Palombo

  2. Zentrum fur Molekulare Biologie der Universitat Heidelberg (ZMBH), Heidelberg, Germany

    H Bujard

  3. Institut fur Mikrobiologie, Universitat Erlangen, Erlangen, Germany

    W Hillen

Authors
  1. L Aurisicchio
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  2. H Bujard
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  3. W Hillen
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  4. R Cortese
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  5. G Ciliberto
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  6. N La Monica
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  7. F Palombo
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Aurisicchio, L., Bujard, H., Hillen, W. et al. Regulated and prolonged expression of mIFNα in immunocompetent mice mediated by a helper-dependent adenovirus vector. Gene Ther 8, 1817–1825 (2001). https://doi.org/10.1038/sj.gt.3301596

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  • DOI: https://doi.org/10.1038/sj.gt.3301596

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