title: Efficient gene transfer into human primary blood lymphocytes by surface-engineered lentiviral vectors that display a T cell-activating polypeptide.
abstract: In contrast to oncoretroviruses, lentiviruses such as human immunodeficiency virus 1 (HIV-1) are able to integrate their genetic material into the genome of nonproliferating cells that are metabolically active. Likewise, vectors derived from HIV-1 can transduce many types of nonproliferating cells, with the exception of some particular quiescent cell types such as resting T cells. Completion of reverse transcription, nuclear import, and subsequent integration of the lentivirus genome do not occur in these cells unless they are activated via the T-cell receptor (TCR) or by cytokines or both. However, to preserve the functional properties of these important gene therapy target cells, only minimal activation with cytokines or TCR-specific antibodies should be performed during gene transfer. Here we report the characterization of HIV-1-derived lentiviral vectors whose virion surface was genetically engineered to display a T cell-activating single-chain antibody polypeptide derived from the anti-CD3 OKT3 monoclonal antibody. Interaction of OKT3 IgGs with the TCR can activate resting peripheral blood lymphocytes (PBLs) by promoting the transition from G(0) to G(1) phases of the cell cycle. Compared to unmodified HIV-1-based vectors, OKT3-displaying lentiviral vectors strongly increased gene delivery in freshly isolated PBLs by up to 100-fold. Up to 48% transduction could be obtained without addition of PBL activation stimuli during infection. Taken together, these results show that surface-engineered lentiviral vectors significantly improve transduction of primary lymphocytes by activating the target cells. Moreover these results provide a proof of concept for an approach that may have utility in various gene transfer applications, including in vivo gene delivery.
authors.affiliation: Laboratoire Vectorologie Rétrovirale et Thérapie Génique, Unité de Virologie Humaine, U412 INSERM, IFR 74 and ENS de Lyon, 46 Allée d'Italie, 69364 Lyon Cedex 07, France.
authors.forename: Marielle
authors.initials: M
authors.lastname: Maurice
authors.forename: Els
authors.initials: E
authors.lastname: Verhoeyen
authors.forename: Patrick
authors.initials: P
authors.lastname: Salmon
authors.forename: Didier
authors.initials: D
authors.lastname: Trono
authors.forename: Stephen J
authors.initials: SJ
authors.lastname: Russell
authors.forename: François-Loïc
authors.initials: FL
authors.lastname: Cosset
mesh_terms: D015703:Antigens, CD / Q000032:analysis; D002460:Cell Line; D005818:Genetic Engineering; D005822:Genetic Vectors; D015497:HIV-1 / Q000235:genetics; D006801:Humans; D019169:Jurkat Cells; D007668:Kidney; D016086:Lentivirus / Q000235:genetics*; D008213:Lymphocyte Activation; D008214:Lymphocytes / Q000276:immunology* / Q000821:virology*; D008222:Lymphokines / Q000235:genetics*; D016853:Muromonab-CD3 / Q000276:immunology; D015202:Protein Engineering; D011993:Recombinant Fusion Proteins / Q000096:biosynthesis; D014161:Transduction, Genetic; D014162:Transfection / Q000379:methods*; D014764:Viral Proteins / Q000235:genetics
chemical_list: D015703:Antigens, CD; D008222:Lymphokines; D016853:Muromonab-CD3; D011993:Recombinant Fusion Proteins; D014764:Viral Proteins; C051344:t cell-activating lymphokine