Protection afforded by an HIV vaccine candidate in macaques depends on the dose of SIVmac251 at challenge exposure.
J Virol
; 87(6): 3538-48, 2013 Mar.
Article
em En
| MEDLINE
| ID: mdl-23325681
ABSTRACT
We used the simian immunodeficiency virus mac251 (SIV(mac251)) macaque model to study the effect of the dose of mucosal exposure on vaccine efficacy. We immunized macaques with a DNA prime followed by SIV gp120 protein immunization with ALVAC-SIV and gp120 in alum, and we challenged them with SIV(mac251) at either a single high dose or at two repeated low-dose exposures to a 10-fold-lower dose. Infection was neither prevented nor modified following a single high-dose challenge of the immunized macaques. However, two exposures to a 10-fold-lower dose resulted in protection from SIV(mac251) acquisition in 3 out of 12 macaques. The remaining animals that were infected had a modulated pathogenesis, significant downregulation of interferon responsive genes, and upregulation of genes involved in B- and T-cell responses. Thus, the choice of the experimental model greatly influences the vaccine efficacy of vaccines for human immunodeficiency virus (HIV).
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Síndrome de Imunodeficiência Adquirida dos Símios
/
Vírus da Imunodeficiência Símia
/
Vacinas contra a SAIDS
Limite:
Animals
Idioma:
En
Revista:
J Virol
Ano de publicação:
2013
Tipo de documento:
Article
País de afiliação:
Estados Unidos