title: IL-7 surface-engineered lentiviral vectors promote survival and efficient gene transfer in resting primary T lymphocytes.
abstract: Important gene therapy target cells such as resting human T cells are refractory to transduction with lentiviral vectors. Completion of reverse transcription, nuclear import, and subsequent integration of the lentiviral genome occur in these cells only if they have been activated. In T-cell-based gene therapy trials performed to date, cells have been activated via their cognate antigen receptor. To couple activation with gene transfer, we previously generated lentiviral vectors displaying an anti-CD3 scFv fragment that allowed up to 48% transduction of freshly isolated T cells. However, transduction of highly purified resting T cells with these anti-CD3-displaying lentiviral vectors was inefficient and shifted the T cells from the naive to the memory phenotype. Here, we describe interleukin-7 (IL-7)-displaying HIV-1-derived vectors. Like recombinant IL-7, these modified particles could promote the survival of primary T cells placed in culture without inducing a naive-to-memory phenotypic switch. Furthermore, a single exposure to the IL-7-displaying vectors resulted in efficient gene transfer in both resting memory adult T cells and naive cord blood T cells. With adult naive T cells, preactivation with recombinant IL-7 was necessary for efficient gene transfer. Altogether, these results suggest that IL-7-displaying vectors could constitute interesting tools for T-cell-targeted gene therapy.
authors.affiliation: Laboratoire de Vectorologie Rétrovirale et Thérapie Génique, Ecole Normale Supérieure de Lyon, Lyon, France.
authors.forename: Els
authors.initials: E
authors.lastname: Verhoeyen
authors.forename: Valerie
authors.initials: V
authors.lastname: Dardalhon
authors.forename: Odile
authors.initials: O
authors.lastname: Ducrey-Rundquist
authors.forename: Didier
authors.initials: D
authors.lastname: Trono
authors.forename: Naomi
authors.initials: N
authors.lastname: Taylor
authors.forename: François-Loïc
authors.initials: FL
authors.lastname: Cosset
mesh_terms: D017252:CD3 Complex / Q000276:immunology; D015496:CD4-Positive T-Lymphocytes / Q000378:metabolism; D002453:Cell Cycle; D002470:Cell Survival; D002478:Cells, Cultured; D005312:Fetal Blood / Q000166:cytology; D015870:Gene Expression; D005822:Genetic Vectors; D015497:HIV-1 / Q000235:genetics; D006801:Humans; D007135:Immunoglobulin Variable Region / Q000235:genetics; D007156:Immunologic Memory; D015851:Interleukin-7 / Q000235:genetics* / Q000502:physiology; D016086:Lentivirus / Q000235:genetics*; D016853:Muromonab-CD3; D011993:Recombinant Fusion Proteins; D011994:Recombinant Proteins; D013601:T-Lymphocytes / Q000166:cytology / Q000378:metabolism*; D014162:Transfection
chemical_list: D017252:CD3 Complex; D007135:Immunoglobulin Variable Region; D015851:Interleukin-7; D016853:Muromonab-CD3; D011993:Recombinant Fusion Proteins; D011994:Recombinant Proteins