Abstract:
:Adenoviral vectors used in gene therapy are predominantly derived from adenovirus serotype 5 (Ad5), which infects a broad range of cells. Ad5 cell entry involves interactions with the coxsackie-adenovirus receptor (CAR) and integrins. To assess these receptors in vivo, we mutated amino acid residues in fiber and penton that are involved in receptor interaction and showed that CAR and integrins play a minor role in hepatic transduction but that integrins can influence gene delivery to other tissues. These data suggest that an alternative entry pathway exists for hepatocyte transduction in vivo that is more important than CAR or integrins. In vitro data suggest a role for heparan sulfate glycosaminoglycans (HSG) in adenovirus transduction. The role of the fiber shaft in liver uptake was examined by introducing specific amino acid changes into a putative HSG-binding motif contained within the shaft or by preparing fiber shaft chimeras between Ad5 and Ad35 fibers. Results were obtained that demonstrate that the Ad5 fiber shaft can influence gene transfer both in vitro and to the liver in vivo. These observations indicate that the currently accepted two-step entry pathway, which involves CAR and integrins, described for adenoviral infection in vitro, is not used for hepatic gene transfer in vivo. In contrast, alpha(v) integrins influence gene delivery to the lung, spleen, heart, and kidney. The detargeted vector constructs described here may provide a foundation for the development of targeted adenoviral vectors.
journal_name
Hum Gene Therjournal_title
Human gene therapyauthors
Smith TA,Idamakanti N,Rollence ML,Marshall-Neff J,Kim J,Mulgrew K,Nemerow GR,Kaleko M,Stevenson SCdoi
10.1089/104303403765255165keywords:
subject
Has Abstractpub_date
2003-05-20 00:00:00pages
777-87issue
8eissn
1043-0342issn
1557-7422journal_volume
14pub_type
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