Abstract
Heterologous mammalian gene regulation systems for adjustable expression of multiple transgenes are necessary for advanced human gene therapy and tissue engineering, and for sophisticated in vivo gene-function analyses, drug discovery, and biopharmaceutical manufacturing. The antibiotic-dependent interaction between the repressor (E) and operator (ETR) derived from an Escherichia coli erythromycin-resistance regulon was used to design repressible (EOFF) and inducible (EON) mammalian gene regulation systems (E.REX) responsive to clinically licensed macrolide antibiotics (erythromycin, clarithromycin, and roxithromycin). The EOFF system consists of a chimeric erythromycin-dependent transactivator (ET), constructed by fusing the prokaryotic repressor E to a eukaryotic transactivation domain that binds and activates transcription from ETR-containing synthetic eukaryotic promoters (PETR). Addition of macrolide antibiotic results in repression of transgene expression. The EON system is based on E binding to artificial ETR-derived operators cloned adjacent to constitutive promoters, resulting in repression of transgene expression. In the presence of macrolides, gene expression is induced. Control of transgene expression in primary cells, cell lines, and microencapsulated human cells transplanted into mice was demonstrated using the E.REX (EOFF and EON) systems. The macrolide-responsive E.REX technology was functionally compatible with the streptogramin (PIP)–regulated and tetracycline (TET)–regulated expression systems, and therefore may be combined for multiregulated multigene therapeutic interventions in mammalian cells and tissues.
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Acknowledgements
We thank N. Noguchi for providing pTZ3509, A. Weber for bibliographic work, E. Niederer (ETH Institute of Biomedical Engineering) for FACS, and J. Zanghi for critical comments on the manuscript. This work was supported by Cistronics Cell Technology (Zurich, Switzerland) and the Swiss National Science Foundation (grant 631-065946). This paper is dedicated to James E. Bailey, an outstanding scientist, friend, and mentor who passed away during the final revision of this manuscript.
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Weber, W., Fux, C., Daoud-El Baba, M. et al. Macrolide-based transgene control in mammalian cells and mice. Nat Biotechnol 20, 901–907 (2002). https://doi.org/10.1038/nbt731
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DOI: https://doi.org/10.1038/nbt731
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