title: Pseudotransduction of hepatocytes by using concentrated pseudotyped vesicular stomatitis virus G glycoprotein (VSV-G)-Moloney murine leukemia virus-derived retrovirus vectors: comparison of VSV-G and amphotropic vectors for hepatic gene transfer.
abstract: Recombinant retrovirus vectors are widely used for gene transfer studies. The recent development of a pseudotyped Moloney murine leukemia virus vector that contains the G envelope protein from the vesicular stomatitis virus allows for efficient concentration of vector and offers hope for potential use of these vectors for gene expression in vivo. A standard amphotropic vector expressing a serum marker protein, human alpha 1-antitrypsin, was infused into regenerating mouse liver and was 10-fold more efficient at achieving stable gene expression than was an equivalent pseudotyped vector. Discrepant results were obtained with cultured hepatocytes infected with an Escherichia coli beta-galactosidase-producing pseudotype and amphotropic vector. High rates of beta-galactosidase-positive cells were detected with the vesicular stomatitis virus G glycoprotein vector under culture conditions known to be relatively nonpermissive for retrovirus-mediated gene transfer. Subsequent studies demonstrated that beta-galactosidase protein was concentrated and copurified during pseudotype vector preparation, resulting in high rates of protein transfer rather than stable gene transfer, a process referred to as pseudotransduction. The cotransfer of protein with concentrated pseudotyped retroviruses indicates that caution must be used when interpreting gene transduction efficiencies in gene therapy experiments.
authors.affiliation: Markey Molecular Medicine Center, Division of Medical Genetics, Department of Medicine, University of Washington, Seattle 98195, USA.
authors.forename: M L
authors.initials: ML
authors.lastname: Liu
authors.forename: B L
authors.initials: BL
authors.lastname: Winther
authors.forename: M A
authors.initials: MA
authors.lastname: Kay
mesh_terms: D016475:3T3 Cells; D000818:Animals; D002460:Cell Line; D002478:Cells, Cultured; D018014:Gene Transfer Techniques; D005822:Genetic Vectors; D006801:Humans; D008099:Liver / Q000166:cytology; D008562:Membrane Glycoproteins; D051379:Mice; D008810:Mice, Inbred C57BL; D008979:Moloney murine leukemia virus / Q000235:genetics*; D051381:Rats; D014759:Viral Envelope Proteins / Q000235:genetics*; D001616:beta-Galactosidase / Q000235:genetics
chemical_list: C028391:G protein, vesicular stomatitis virus; D008562:Membrane Glycoproteins; D014759:Viral Envelope Proteins; D001616:beta-Galactosidase