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  • Original Article
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Re-targeted adenovirus vectors with dual specificity; binding specificities conferred by two different Affibody molecules in the fiber

Abstract

Vectors based on Adenovirus type 5 (Ad5) are among the most common vectors in cancer gene therapy trials to date. However, for increased efficiency and safety, Ad5 should be de-targeted from its native receptors and re-targeted to a tumor antigen. We have described earlier an Ad5 vector genetically re-targeted to the tumor antigen HER2/neu by a dimeric version of the Affibody molecule ZH inserted in the HI-loop of the fiber knob of a coxsackie and adenovirus receptor-binding ablated fiber. This virus showed almost wild-type growth characteristics and infected cells through HER2/neu. Here we generate vectors with double specificity by incorporating two different Affibody molecules, ZH (HER2/neu-binding) and ZT (Taq polymerase-binding), at different positions relative to one another in the HI-loop. Receptor-binding studies together with viral production and gene transfer assays showed that the recombinant fiber with ZT in the first position and ZH in the second position (ZTZH) bound to both its targets, whereas surprisingly, the fiber with ZHZT was devoid of binding to HER2/neu. Hence, it is possible to construct a recombinant adenovirus with dual specificity after evaluating the best position for each ligand in the fiber knob.

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Acknowledgements

We are grateful to Affibody AB for providing us with the ZH and ZT Affibody molecules. This study was supported by the European Community (GIANT), contract number: FP6-2003-LIFESCIHEALTH-I 512087 and by grants from the Medical Faculty at the Sahlgrenska Academy: Knut and Alice Wallenbergs stiftelse and Adlerbertska forskningsstiftelsen.

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Correspondence to M K Magnusson.

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Myhre, S., Henning, P., Friedman, M. et al. Re-targeted adenovirus vectors with dual specificity; binding specificities conferred by two different Affibody molecules in the fiber. Gene Ther 16, 252–261 (2009). https://doi.org/10.1038/gt.2008.160

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