title: Development of ecdysone-regulated lentiviral vectors.
abstract: We have engineered a lentivirus-based gene transfer system to achieve ecdysone-regulated transgene expression. The method combines the wide tropism of lentiviral vectors and the possibility of gene regulation by a small molecule with an excellent pharmacological profile. Using the hematopoietic tissue as a model, we transduced mouse progenitors with an ecdysone-regulated GFP expression cassette. The ecdysone gene switch efficiently turned GFP on and off in transplanted animals, showing low basal activity. This system allows the delivery of inducible transcriptional units in vitro and ex vivo and may be a useful tool for gene transfer purposes. Moreover, our work provides hints on the design of lentiviral vectors containing multiple expression cassettes with multiple promoters.
authors.affiliation: Laboratory of Genetics, The Salk Institute for Biological Studies, 10110 North Torrey Pines Road, La Jolla, CA 92037, USA.
authors.forename: Francesco
authors.initials: F
authors.lastname: Galimi
authors.forename: Enrique
authors.initials: E
authors.lastname: Saez
authors.forename: Jason
authors.initials: J
authors.lastname: Gall
authors.forename: Nien
authors.initials: N
authors.lastname: Hoong
authors.forename: Gerald
authors.initials: G
authors.lastname: Cho
authors.forename: Ronald M
authors.initials: RM
authors.lastname: Evans
authors.forename: Inder M
authors.initials: IM
authors.lastname: Verma
mesh_terms: D000818:Animals; D016026:Bone Marrow Transplantation; D002460:Cell Line; D004440:Ecdysone / Q000378:metabolism / Q000494:pharmacology*; D005786:Gene Expression Regulation / Q000235:genetics*; D005822:Genetic Vectors / Q000235:genetics*; D006412:Hematopoietic Stem Cells / Q000187:drug effects / Q000378:metabolism; D006801:Humans; D016086:Lentivirus / Q000235:genetics*; D051379:Mice; D008810:Mice, Inbred C57BL; D011401:Promoter Regions, Genetic / Q000235:genetics; D011987:Receptors, Steroid / Q000235:genetics / Q000378:metabolism; D014161:Transduction, Genetic
chemical_list: D011987:Receptors, Steroid; C055469:ecdysone receptor; D004440:Ecdysone