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Journal of Virology, July 2001, p. 6615-6624, Vol. 75, No. 14
0022-538X/01/$04.00+0 DOI: 10.1128/JVI.75.14.6615-6624.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
Adeno-Associated Virus Type 6 (AAV6) Vectors
Mediate Efficient Transduction of Airway Epithelial Cells in Mouse
Lungs Compared to That of AAV2 Vectors
Christine L.
Halbert,
James
M.
Allen,
and
A. Dusty
Miller*
Fred Hutchinson Cancer Research Center,
Seattle, Washington 98109
Received 19 January 2001/Accepted 19 April 2001
Although vectors derived from adeno-associated virus type 2 (AAV2)
promote gene transfer and expression in many somatic tissues, studies
with animal models and cultured cells show that the apical surface of
airway epithelia is resistant to transduction by AAV2 vectors.
Approaches to increase transduction rates include increasing the amount
of vector and perturbing the integrity of the epithelia. In this study,
we explored the use of vectors based on AAV6 to increase transduction
rates in airways. AAV vectors were made using combinations of
rep, cap, and packaged genomes from AAV2 or AAV6. The packaged genomes encoded human placental alkaline phosphatase and contained terminal repeat sequences from AAV2 or AAV6.
We found that transduction efficiency was primarily dependent on the
source of Cap protein, defined here as the vector pseudotype. The AAV6
and AAV2 pseudotype vectors exhibited different tropisms in
tissue-cultured cells, and cell transduction by AAV6 vectors was not
inhibited by heparin, nor did they compete for entry in a transduction
assay, indicating that AAV6 and AAV2 capsid bind different receptors.
In vivo analysis of vectors showed that AAV2 pseudotype vectors gave
high transduction rates in alveolar cells but much lower rates in the
airway epithelium. In contrast, the AAV6 pseudotype vectors exhibited
much more efficient transduction of epithelial cells in large and small
airways, showing up to 80% transduction in some airways. These
results, combined with our previous results showing lower
immunogenicity of AAV6 than of AAV2 vectors, indicate that AAV6 vectors
may provide significant advantages over AAV2 for gene therapy of lung
diseases like cystic fibrosis.
*
Corresponding author. Mailing address: Fred Hutchinson
Cancer Research Center, 1100 Fairview Ave. North, Room C2-105, Seattle, WA 98109-1024. Phone: (206) 667-2890. Fax: (206) 667-6523. E-mail: dmiller{at}fhcrc.org.

Present address: Avigen Inc., Alameda, CA
94502.
Journal of Virology, July 2001, p. 6615-6624, Vol. 75, No. 14
0022-538X/01/$04.00+0 DOI: 10.1128/JVI.75.14.6615-6624.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
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