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J. Virol., 04 1996, 2581-2585, Vol 70, No. 4
RK Akkina, RM Walton, ML Chen, QX Li, V Planelles and IS Chen
Currently, amphotropic retroviral vectors are widely used for gene transfer
into CD34+ hematopoietic progenitor cells. The relatively low levels of
transduction efficiency associated with these vectors in human cells is due
to low viral titers and limitations in concentrating the virus because of
the inherent fragility of retroviral envelopes. Here we show that a human
immunodeficiency virus type 1 (HIV-1)-based retroviral vector containing
the firefly luciferase reporter gene can be pseudotyped with a
broad-host-range vesicular stomatitis virus envelope glycoprotein G
(VSV-G). Higher-efficiency gene transfer into CD34+ cells was achieved with
a VSV-G-pseudotyped HIV-1 vector than with a vector packaged in an
amphotropic envelope. Concentration of virus without loss of viral
infectivity permitted a higher multiplicity of infection, with a consequent
higher efficiency of gene transfer, reaching 2.8 copies per cell. These
vectors also showed remarkable stability during storage at 4 degrees C for
a week. In addition, there was no significant loss of titer after freezing
and thawing of the stock virus. The ability of VSV-G-pseudotyped retroviral
vectors to achieve a severalfold increase in levels of transduction into
CD34+ cells will allow high-efficiency gene transfer into hematopoietic
progenitor cells for gene therapy purposes. Furthermore, since it has now
become possible to infect CD34+ cells with pseudotyped HIV-1 with a high
level of efficiency in vitro, many important questions regarding the effect
of HIV-1 on lineage-specific differentiation of hematopoietic progenitors
can now be addressed.
Copyright © 1996, American Society for Microbiology
High-efficiency gene transfer into CD34+ cells with a human immunodeficiency virus type 1-based retroviral vector pseudotyped with vesicular stomatitis virus envelope glycoprotein G
Department of Pathology, Colorado State University, Fort Collins 80523, USA.
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