Intranasal immunization with SIV virus-like particles (VLPs) elicits systemic and mucosal immunity.

Abstract:

:By using a baculovirus expression system, we have successfully produced simian immunodeficiency virus (SIV)-like particles (VLPs) with high levels of biologically active SIV envelope (Env) incorporated on their surfaces. To study whether SIV VLPs represent effective mucosal immunogens, we immunized groups of mice with VLPs alone or VLPs plus the mucosal adjuvant cholera toxin (CT) by the intranasal (i.n.) route. High levels of serum IgG antibody production were achieved in mice immunized intranasally with SIV VLPs, and the antibody response was found to be antigen dose-dependent. The IgG1 and IgG2a ratio indicates that immune responses induced by SIV VLPs are Th1 oriented. Mice immunized with VLPs plus CT were found to exhibit higher serum antibody responses than those immunized with VLPs alone (P<0.001). Furthermore, IgA antibody production was detected in both saliva and vaginal fluid from mice mucosally immunized with SIV VLPs. Higher levels of IgA were found in vaginal fluid than in saliva in animals immunized with SIV VLPs plus CT (P<0.05). Higher neutralizing activity to SIV 1A11 was also found in serum of animals immunized with SIV VLPs plus CT. Moreover, increased numbers of MHC I-restricted peptide-specific IFN-gamma and IL-4 producing T cells were detected in both splenocytes and lymph nodes by intranasal immunization of SIV VLP plus CT. These results suggest that VLPs are effective mucosal antigens that can induce both humoral and cellular immune responses at systemic and mucosal sites.

journal_name

Vaccine

journal_title

Vaccine

authors

Yao Q,Vuong V,Li M,Compans RW

doi

10.1016/s0264-410x(02)00160-3

subject

Has Abstract

pub_date

2002-06-07 00:00:00

pages

2537-45

issue

19-20

eissn

0264-410X

issn

1873-2518

pii

S0264410X02001603

journal_volume

20

pub_type

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