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J. Virol., Nov 1997, 8221-8229, Vol 71, No. 11
TJ Wickham, E Tzeng, LL Shears 2nd, PW Roelvink, Y Li, GM Lee, DE Brough, A Lizonova and I Kovesdi
Alteration of the natural tropism of adenovirus (Ad) will permit gene
transfer into specific cell types and thereby greatly broaden the scope of
target diseases that can be treated by using Ad. We have constructed two Ad
vectors which contain modifications to the Ad fiber coat protein that
redirect virus binding to either alpha(v) integrin [AdZ.F(RGD)] or heparan
sulfate [AdZ.F(pK7)] cellular receptors. These vectors were constructed by
a novel method involving E4 rescue of an E4-deficient Ad with a transfer
vector containing both the E4 region and the modified fiber gene.
AdZ.F(RGD) increased gene delivery to endothelial and smooth muscle cells
expressing alpha(v) integrins. Likewise, AdZ.F(pK7) increased transduction
5- to 500-fold in multiple cell types lacking high levels of Ad fiber
receptor, including macrophage, endothelial, smooth muscle, fibroblast, and
T cells. In addition, AdZ.F(pK7) significantly increased gene transfer in
vivo to vascular smooth muscle cells of the porcine iliac artery following
balloon angioplasty. These vectors may therefore be useful in gene therapy
for vascular restenosis or for targeting endothelial cells in tumors.
Although binding to the fiber receptor still occurs with these vectors,
they demonstrate the feasibility of tissue-specific receptor targeting in
cells which express low levels of Ad fiber receptor.
Copyright © 1997, American Society for Microbiology
Increased in vitro and in vivo gene transfer by adenovirus vectors containing chimeric fiber proteins
GenVec, Inc., Rockville, Maryland 20852, USA.
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