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Pulmonary inflammation associated with repeated, prenatal exposure to an E1, E3-deleted adenoviral vector in sheep

Abstract

Fetal gene therapy may prove useful in treating diseases that manifest in the perinatal or early postnatal period. Adenoviruses effectively transfer gene expression to a variety of tissues but also stimulate inflammatory and immune responses. The purpose of this study was to test the hypothesis that exposure of fetal sheep to a first generation adenovirus vector encoding bacterial β-galactosidase, Av1nBg, before the development of the immune system, is safe, minimizes inflammatory and immune responses and induces tolerance. A total of 22 fetal sheep was studied; of these, two were born with respiratory distress, seven were electively killed and 13 died in utero. The incidence of mortality was higher than the 10% we have experienced with other fetal sheep studies and was not likely related to complications arising from surgical or anesthetic procedures. Inflammatory and fibrotic responses were observed in the lungs and may represent untoward long-term consequences of in utero adenoviral gene therapy. Tolerance to Av1nBg was not established, and repeated exposure to Av1nBg before birth was associated with significant pathology and mortality.

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Iwamoto, H., Trapnell, B., McConnell, C. et al. Pulmonary inflammation associated with repeated, prenatal exposure to an E1, E3-deleted adenoviral vector in sheep. Gene Ther 6, 98–106 (1999). https://doi.org/10.1038/sj.gt.3300804

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