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Bovine AAV transcytosis inhibition by tannic acid results in functional expression of CFTR in vitro and altered biodistribution in vivo

Abstract

Bovine adeno-associated virus (BAAV) can enter a cell either through a transcytosis or transduction pathway. We previously demonstrated that particles entering via the transcytosis pathway can be redirected to transduce the cell by blocking particle exocytosis with tannic acid (TA). To investigate whether this approach is useful in lung gene therapy applications, we tested the effect of TA on BAAV transduction in cystic fibrosis airway epithelia in vitro, and in mouse lung in vivo. Our findings suggest that BAAV transcytosis can occur in vivo and that treatment with TA reduces transcytosis and increases lung transduction. TA treatment did not impair the sorting and the activity of the BAAV expressed cystic fibrosis transmembrane regulator membrane protein.

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Acknowledgements

We thank Michael Welsh for his helpful suggestions. This study was supported by an NIH/NIDCR intramural grant to JAC.

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Correspondence to J A Chiorini.

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Di Pasquale, G., Ostedgaard, L., Vermeer, D. et al. Bovine AAV transcytosis inhibition by tannic acid results in functional expression of CFTR in vitro and altered biodistribution in vivo. Gene Ther 19, 576–581 (2012). https://doi.org/10.1038/gt.2011.138

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