A DNA vaccine encoding ubiquitinated Rift Valley fever virus nucleoprotein provides consistent immunity and protects IFNAR(-/-) mice upon lethal virus challenge.

Abstract:

:Current vaccine candidates against Rift Valley fever virus (RVFV) incorporate the viral structural glycoproteins as antigens, since triggering antibody responses against them usually correlates with protection. Here, we have focused solely on the nucleoprotein of RVFV as a potential target for vaccine development. Previous studies in mouse models have already demonstrated that RVFV nucleoprotein can elicit partial protection when administered by means of a DNA vaccine or in recombinant, soluble, protein form. To determine whether this partially protective immune response could be augmented to a level comparable to DNA constructs encoding for RVFV glycoproteins, several targeting sequences were cloned adjacent to the RVFV nucleoprotein (N) gene. Immunization with a plasmid construct encoding for a ubiquitinated form of the viral nucleoprotein (pCMV-Ub-N) significantly increased the survival of IFNAR(-/-) mice following viral challenge to levels comparable with a recombinant DNA-vaccine encoding both RVFV glycoproteins. Mice immunized with pCMV-Ub-N also displayed higher levels of non-neutralizing anti-N antibodies and antigen-specific T-cell responses. This suggests a role for other cell mediated responses in protection against RVFV. These findings show the potential of RVFV N as a candidate antigen for vaccination, and present a new strategy in vaccine design against certain bunyaviruses, where glycoprotein variation may impede effective broad-based vaccination strategies.

journal_name

Vaccine

journal_title

Vaccine

authors

Boshra H,Lorenzo G,Rodriguez F,Brun A

doi

10.1016/j.vaccine.2011.04.043

subject

Has Abstract

pub_date

2011-06-15 00:00:00

pages

4469-75

issue

27

eissn

0264-410X

issn

1873-2518

pii

S0264-410X(11)00588-3

journal_volume

29

pub_type

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