Hepatitis C virus soluble E2 in combination with QuilA and CpG ODN induces neutralizing antibodies in mice.

Abstract:

:Several studies have emphasized the importance of an early, highly neutralizing antibody response in the clearance of Hepatitis C virus (HCV) infection. The envelope glycoprotein E2 is a major target for HCV neutralizing antibodies. Here, we compared antibody responses in mice immunized with native soluble E2 (sE2) from the H77 1a isolate coupled with different adjuvants or combinations of adjuvants. Adjuvanting sE2 with Freund's, monophosphoryl lipid A (MPL), cytosine phosphorothioate guanine oligodeoxynucleotide (CpG ODN), or alpha-galactosylceramide (αGalCer) derivatives elicited only moderate antibody responses. In contrast, immunizations with sE2 and QuilA elicited exceptionally high anti-E2 antibody titers. Sera from these mice effectively neutralized HCV pseudoparticles (HCVpp) 1a entry. Moreover, the combination of QuilA and CpG ODN further enhanced neutralizing antibody titers wherein cross-neutralization of HCVpp 4 was observed. We conclude that the combination of QuilA and CpG ODN is a promising adjuvant combination that should be further explored for the development of an HCV subunit vaccine. Our work also emphasizes that the ideal combination of adjuvant and immunogen has to be determined empirically.

journal_name

Vaccine

journal_title

Vaccine

authors

Naarding MA,Falkowska E,Xiao H,Dragic T

doi

10.1016/j.vaccine.2011.02.009

subject

Has Abstract

pub_date

2011-04-05 00:00:00

pages

2910-7

issue

16

eissn

0264-410X

issn

1873-2518

pii

S0264-410X(11)00210-6

journal_volume

29

pub_type

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