title: Reduction of liver macrophage transduction by pseudotyping lentiviral vectors with a fusion envelope from Autographa californica GP64 and Sendai virus F2 domain.
abstract: BACKGROUND
  Lentiviral vectors are well suited for gene therapy because they can mediate long-term expression in both dividing and nondividing cells. However, lentiviral vectors seem less suitable for liver gene therapy because systemically administered lentiviral vectors are preferentially sequestered by liver macrophages. This results in a reduction of available virus and might also increase the immune response to the vector and vector products.Reduction of macrophage sequestration is therefore essential for efficient lentiviral liver gene therapy.
  
  
  RESULTS
  Fusions were made of Autographa californica GP64 and the hepatocyte specific Sendai Virus envelope proteins. Lentiviral vectors were produced with either wild type GP64, Sendai-GP64, or both wild type GP64 and Sendai-GP64 and tested in vitro and in vivo for hepatocyte and macrophage gene transfer.Sendai-GP64 pseudotyped vectors showed specific gene transfer to HepG2 hepatoma cells, with no detectable transduction of HeLa cervical carcinoma cells, and a decreased affinity for RAW mouse macrophages. Co-expression of wild type GP64 and Sendai-GP64 resulted in improved viral titers while retaining increased affinity for HepG2 cells.In vivo, the Sendai-GP64 vectors also showed decreased transduction of murine liver macrophages.
  
  
  CONCLUSIONS
  We demonstrate reduced macrophage transduction in vitro and in vivo with GP64/Sendai chimeric envelope proteins.
authors.affiliation: AMC Liver Center, Amsterdam, The Netherlands. dmarkusic@ufl.edu
authors.forename: David M
authors.initials: DM
authors.lastname: Markusic
authors.forename: Niek P
authors.initials: NP
authors.lastname: van Til
authors.forename: Johan K
authors.initials: JK
authors.lastname: Hiralall
authors.forename: Ronald P J Oude
authors.initials: RP
authors.lastname: Elferink
authors.forename: Jurgen
authors.initials: J
authors.lastname: Seppen
mesh_terms: D000818:Animals; D045744:Cell Line, Tumor; D005822:Genetic Vectors; D022781:Hepatocytes / Q000378:metabolism; D006801:Humans; D016086:Lentivirus / Q000235:genetics*; D008099:Liver / Q000166:cytology; D008264:Macrophages / Q000378:metabolism*; D008297:Male; D051379:Mice; D017924:Nucleopolyhedroviruses / Q000235:genetics; D029082:Sendai virus / Q000235:genetics; D014161:Transduction, Genetic; D014760:Viral Fusion Proteins / Q000235:genetics*
chemical_list: D014760:Viral Fusion Proteins