1887

Abstract

Adenoviral vectors can be used to generate potent humoral and cellular immune responses to transgene products. Use of adenoviral vectors based on non-human isolates may allow for their utilization in populations harbouring neutralizing antibodies to common human serotypes. A vector chimera was constructed using simian adenovirus 22 (a serotype belonging to the species ) and simian adenovirus 21 (a serotype belonging to the species ) expressing the Ebola (Zaire) virus glycoprotein (Ad C5/C1-ZGP). This chimeric adenovirus vector was used as a model to test its efficacy as a genetic vaccine and comparisons were made to a vector based on the commonly used human adenovirus C serotype 5 (Adhu5-ZGP). Ebola glycoprotein-specific T- and B-cell responses were measured in B10BR mice vaccinated with either Adhu5-ZGP or Ad C5/C1-ZGP vectors. Both vectors resulted in Ebola glycoprotein-specific gamma interferon-expressing T cells, although the Ad C5/C1-ZGP vector appeared to induce lower frequencies with kinetics slower than those elicited by the Adhu5-ZGP vector. The total immunoglobulin G response to Ebola glycoprotein was similar in sera from mice vaccinated with either vector. Two rhesus macaques vaccinated with the Ad C5/C1-ZGP vector were found to mount T-cell and antibody responses to the Ebola glycoprotein. It was found that a single administration of the chimeric Ad C5/C1-ZGP vector protected mice against a lethal challenge with a mouse-adapted strain of the Ebola (Zaire) virus.

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2006-09-01
2024-03-29
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