title: Measles virus glycoprotein-pseudotyped lentiviral vector-mediated gene transfer into quiescent lymphocytes requires binding to both SLAM and CD46 entry receptors.
abstract: Gene transfer into quiescent T and B cells is of importance for gene therapy and immunotherapy approaches to correct hematopoietic disorders. Previously, we generated lentiviral vectors (LVs) pseudotyped with the Edmonston measles virus (MV) hemagglutinin and fusion glycoproteins (Hgps and Fgps) (H/F-LVs), which, for the first time, allowed efficient transduction of quiescent human B and T cells. These target cells express both MV entry receptors used by the vaccinal Edmonston strain, CD46 and signaling lymphocyte activation molecule (SLAM). Interestingly, LVs pseudotyped with an MV Hgp, blind for the CD46 binding site, were completely inefficient for resting-lymphocyte transduction. Similarly, SLAM-blind H mutants that recognize only CD46 as the entry receptor did not allow stable LV transduction of resting T cells. The CD46-tropic LVs accomplished vector-cell binding, fusion, entry, and reverse transcription at levels similar to those achieved by the H/F-LVs, but efficient proviral integration did not occur. Our results indicate that both CD46 and SLAM binding sites need to be present in cis in the Hgp to allow successful stable transduction of quiescent lymphocytes. Moreover, the entry mechanism utilized appears to be crucial: efficient transduction was observed only when CD46 and SLAM were correctly engaged and an entry mechanism that strongly resembles macropinocytosis was triggered. Taken together, our results suggest that although vector entry can occur through the CD46 receptor, SLAM binding and subsequent signaling are also required for efficient LV transduction of quiescent lymphocytes to occur.
authors: Université de Lyon, UCB-Lyon 1, IFR128, Lyon F-69007, INSERM, U758, Lyon F-69364, France.
authors: Cecilia
authors: C
authors: Frecha
authors: Camille
authors: C
authors: Lévy
authors: Caroline
authors: C
authors: Costa
authors: Didier
authors: D
authors: Nègre
authors: Fouzia
authors: F
authors: Amirache
authors: Robin
authors: R
authors: Buckland
authors: Steven J
authors: SJ
authors: Russell
authors: François-Loïc
authors: FL
authors: Cosset
authors: Els
authors: E
authors: Verhoeyen
mesh_terms: D000328:Adult; D015703:Antigens, CD / Q000235:genetics / Q000378:metabolism*; D001402:B-Lymphocytes / Q000276:immunology / Q000378:metabolism / Q000821:virology; D018014:Gene Transfer Techniques; D005822:Genetic Vectors / Q000235:genetics*; D006023:Glycoproteins / Q000235:genetics*; D006801:Humans; D016086:Lentivirus / Q000235:genetics* / Q000378:metabolism; D008213:Lymphocyte Activation; D008459:Measles virus / Q000737:chemistry / Q000235:genetics*; D051916:Membrane Cofactor Protein / Q000235:genetics / Q000378:metabolism*; D010873:Pinocytosis; D011956:Receptors, Cell Surface / Q000235:genetics / Q000378:metabolism*; D000071177:Signaling Lymphocytic Activation Molecule Family Member 1; D013601:T-Lymphocytes / Q000276:immunology / Q000378:metabolism / Q000821:virology; D014161:Transduction, Genetic; D014759:Viral Envelope Proteins / Q000235:genetics / Q000378:metabolism
chemical_list: D015703:Antigens, CD; D006023:Glycoproteins; D051916:Membrane Cofactor Protein; D011956:Receptors, Cell Surface; D014759:Viral Envelope Proteins; D000071177:Signaling Lymphocytic Activation Molecule Family Member 1