Clinical assessment of a recombinant simian adenovirus ChAd63: a potent new vaccine vector
Geraldine A O'Hara, Christopher J A Duncan, Katie J Ewer, Katharine A Collins, Sean C Elias, Fenella D Halstead, Anna L Goodman, Nick J Edwards, Arturo Reyes-Sandoval, Prudence Bird, Rosalind Rowland, Susanne H Sheehy, Ian D Poulton, Claire Hutchings, Stephen Todryk, Laura Andrews, Antonella Folgori, Eleanor Berrie, Sarah Moyle, Alfredo Nicosia, Stefano Colloca, Riccardo Cortese, Loredana Siani, Alison M Lawrie, Sarah C Gilbert, Adrian V S Hill, Geraldine A O'Hara, Christopher J A Duncan, Katie J Ewer, Katharine A Collins, Sean C Elias, Fenella D Halstead, Anna L Goodman, Nick J Edwards, Arturo Reyes-Sandoval, Prudence Bird, Rosalind Rowland, Susanne H Sheehy, Ian D Poulton, Claire Hutchings, Stephen Todryk, Laura Andrews, Antonella Folgori, Eleanor Berrie, Sarah Moyle, Alfredo Nicosia, Stefano Colloca, Riccardo Cortese, Loredana Siani, Alison M Lawrie, Sarah C Gilbert, Adrian V S Hill
Abstract
Background: Vaccine development in human Plasmodium falciparum malaria has been hampered by the exceptionally high levels of CD8(+) T cells required for efficacy. Use of potently immunogenic human adenoviruses as vaccine vectors could overcome this problem, but these are limited by preexisting immunity to human adenoviruses.
Methods: From 2007 to 2010, we undertook a phase I dose and route finding study of a new malaria vaccine, a replication-incompetent chimpanzee adenovirus 63 (ChAd63) encoding the preerythrocytic insert multiple epitope thrombospondin-related adhesion protein (ME-TRAP; n = 54 vaccinees) administered alone (n = 28) or with a modified vaccinia virus Ankara (MVA) ME-TRAP booster immunization 8 weeks later (n = 26). We observed an excellent safety profile. High levels of TRAP antigen-specific CD8(+) and CD4(+) T cells, as detected by interferon γ enzyme-linked immunospot assay and flow cytometry, were induced by intramuscular ChAd63 ME-TRAP immunization at doses of 5 × 10(10) viral particles and above. Subsequent administration of MVA ME-TRAP boosted responses to exceptionally high levels, and responses were maintained for up to 30 months postvaccination.
Conclusions: The ChAd63 chimpanzee adenovirus vector appears safe and highly immunogenic, providing a viable alternative to human adenoviruses as vaccine vectors for human use.
Clinical trials registration: NCT00890019.
Figures
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Source: PubMed