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Recombinant serotype 5 adenovirus (Ad5) vectors lacking E1 expression induce robust immune responses against encoded transgenes in pre-clinical models, but have muted responses in human trials because of widespread pre-existing anti-adenovirus immunity. Attempts to circumvent Ad5-specific immunity by using alternative serotypes or modifying capsid components have not yielded profound clinical improvement. To address this issue, we explored a novel alternative strategy, specifically reducing the expression of structural Ad5 genes by creating E1 and E2b deleted recombinant Ad5 vectors. Our data show that [E1-, E2b-]vectors retaining the Ad5 serotype are potent immunogens in pre-clinical models despite the presence of significant Ad5-specific immunity, in contrast to [E1-] vectors. These pre-clinical studies with E1 and E2b-deleted recombinant Ad5 vectors suggest that anti-Ad immunity will no longer be a limiting factor, and that clinical trials to evaluate their performance are warranted.

Optimization of vaccine responses with an E1, E2b and E3-deleted Ad5 vector circumvents pre-existing anti-vector immunity