1. A CD46-binding chimpanzee adenovirus vector as a vaccine carrier.
- Author
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Tatsis N, Blejer A, Lasaro MO, Hensley SE, Cun A, Tesema L, Li Y, Gao GP, Xiang ZQ, Zhou D, Wilson JM, and Ertl HC
- Subjects
- Animals, Antibodies immunology, CD8-Positive T-Lymphocytes immunology, Cell Line, Dendritic Cells immunology, Dendritic Cells metabolism, Humans, Membrane Cofactor Protein genetics, Mice, Pan troglodytes genetics, Protein Binding, Sensitivity and Specificity, Transgenes genetics, Adenoviridae genetics, Genetic Vectors genetics, Membrane Cofactor Protein metabolism, Pan troglodytes metabolism, Vaccines immunology
- Abstract
A replication-defective chimeric vector based on the chimpanzee adenovirus serotype C1 was developed and tested as a vaccine carrier in mice. The AdC1 virus is closely related to human adenoviruses of subgroup B2 and uses CD46 for cell attachment. To overcome poor growth of E1-deleted AdC1 vectors on cell lines that provide the E1 of adenovirus of the human serotype 5 (AdHu5) virus in trans, the inverted terminal repeats and some of the early genes of AdC1 were replaced with those from AdC5, a chimpanzee origin adenovirus of subfamily E. The chimeric AdC1/C5 vector efficiently transduces CD46-expressing mouse dendritic cells (DCs) in vitro and initiates their maturation. Transduction of DCs in vivo is inefficient in CD46 transgenic mice. The AdC1/C5 vector induces transgene product-specific B- and CD8(+) T-cell responses in mice. Responses are slightly higher in wild-type mice than in CD46 transgenic mice. Transgene product-specific T-cell responses elicited by the AdC1/C5 vector can be increased by priming or boosting with a heterologous adenovirus vector. Pre-existing immunity to adenovirus of the common human serotype 5 does not affect induction of cell-mediated immune responses by the AdC1/C5 vector. This vector provides an additional tool in a repertoire of adenovirus-based vaccine vectors.
- Published
- 2007
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