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Journal of Virology, December 2000, p. 11359-11366, Vol. 74, No. 23
Program in Gene Therapy, Departments of
Internal Medicine1 and
Neurology,2 University of Iowa
College of Medicine, Iowa City, Iowa 52242
Received 23 June 2000/Accepted 30 August 2000
Some inborn errors of metabolism due to deficiencies of soluble
lysosomal enzymes cause global neurodegenerative disease. Representative examples include the infantile and late infantile forms
of the ceroid lipofuscinoses (CLN1 or CLN2 deficiency, respectively) and mucopolysaccharidoses type VII (MPS VII), a deficiency of
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Copyright © 2000, American Society for Microbiology. All rights reserved.
Recombinant Human Adenovirus: Targeting to the
Human Transferrin Receptor Improves Gene Transfer to Brain
Microcapillary Endothelium
-glucuronidase. Treatment of the central nervous system component of
these disorders will require widespread protein or enzyme replacement, either through dissemination of the protein or through dissemination of
a gene encoding it. We hypothesize that transduction of brain microcapillary endothelium (BME) with recombinant viral vectors, with
secretion of enzyme product basolaterally, could allow for widespread
enzyme dissemination. To achieve this, viruses should be modified to
target the BME. This requires (i) identification of a BME-resident
target receptor, (ii) identification of motifs targeted to that
molecule, (iii) the construction of modified viruses to allow for
binding to the target receptor, and (iv) demonstrated transduction of
receptor-expressing cells. In proof of principal experiments, we chose
the human transferrin receptor (hTfR), a molecule found at high density
on human BME. A nonamer phage display library was panned for motifs
which could bind hTfR. Forty-three clones were sequenced, most of which
contained an AKxxK/R, KxKxPK/R, or KxK motif. Ten peptides
representative of the three motifs were cloned into the HI loop of
adenovirus type 5 fiber. All motifs tested retained their ability to
trimerize and bind transferrin receptor, and seven allowed for
recombinant adenovirus production. Importantly, the fiber-modified
viruses facilitated increased gene transfer (2- to 34-fold) to hTfR
expressing cell lines and human brain microcapillary endothelia
expressing high levels of endogenous receptor. Our data indicate that
adenoviruses can be modified in the HI loop for expanded tropism to the hTfR.
*
Corresponding author. Mailing address: Department of
Internal Medicine and Neurology, 200 EMRB, University of Iowa College of Medicine, Iowa City, IA 52242. Phone: (319) 353-5511. Fax: (319)
353-5572. E-mail: beverly-davidson{at}uiowa.edu.
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