1887

Abstract

Modified vaccinia virus Ankara (MVA) is a highly attenuated strain known to be an effective vaccine vector. Here it is demonstrated that MVA, unlike standard vaccinia virus (VACV) strains, activates monocyte-derived human dendritic cells (DCs) as testified by an increase in surface co-stimulatory molecules and the secretion of pro-inflammatory cytokines. Inhibition of virus gene expression by subjecting MVA to UV light or heat treatment did not alter its ability to activate DCs. On the other hand, standard VACV strains activated DCs if virus gene expression was prevented by prior UV light or heat treatment. These results suggest that MVA or standard VACV particles are responsible for DC activation but, in the case of standard VACV strains, virus gene expression prevents activation. Additional experiments showed that DCs were activated by MVA-infected HeLa cells and, under these conditions, could induce secretion of gamma interferon from T lymphocytes more efficiently than if a replication-competent VACV strain was employed. These data provide one explanation for the remarkable immune-stimulating capacity of MVA in the absence of virus multiplication.

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2004-08-01
2019-11-13
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