Abstract |
Although adenovirus (Ad) has been regarded as an excellent vaccine vector, there are 2 major drawbacks to using this platform: (a) Ad-based vaccines induce a relatively weak humoral response against encoded transgenes, and (b) preexisting immunity to Ad is highly prevalent among the general population. To overcome these obstacles, we constructed an Ad-based malaria vaccine by inserting a B cell epitope derived from a Plasmodium yoelii circumsporozoite (CS) protein (referred to as the PyCS-B epitope) into the capsid proteins of WT/CS-GFP, a recombinant Ad expressing P. yoelii CS protein and GFP as its transgene. Multiple vaccinations with the capsid-modified Ad induced a substantially increased level of protection against subsequent malaria challenge in mice when compared with that of unmodified WT/CS-GFP. Increased protection correlated with augmented antibody responses against the PyCS-B epitope expressed in the capsid. Furthermore, replacement of hypervariable region 1 (HVR1) of the Ad capsid proteins with the PyCS-B epitope circumvented neutralization of the modified Ad by preexisting Ad-specific antibody, both in vivo and in vitro. Importantly, the immunogenicity of the Ad-containing PyCS-B epitope in the HVR1 and a P. yoelii CS transgene was maintained. Overall, this study demonstrates that the HVR1-modifed Ad vastly improves upon Ad as a promising malaria vaccine platform candidate.
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Authors | Takayuki Shiratsuchi, Urvashi Rai, Anja Krause, Stefan Worgall, Moriya Tsuji |
Journal | The Journal of clinical investigation
(J Clin Invest)
Vol. 120
Issue 10
Pg. 3688-701
(Oct 2010)
ISSN: 1558-8238 [Electronic] United States |
PMID | 20811151
(Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)
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Chemical References |
- Antibodies, Protozoan
- Capsid Proteins
- Epitopes, B-Lymphocyte
- Protozoan Proteins
- circumsporozoite protein, Protozoan
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Topics |
- Adenoviridae
(genetics, immunology)
- Animals
- Antibodies, Protozoan
(immunology)
- Base Sequence
- Capsid Proteins
(immunology)
- Cell Line, Tumor
- Epitopes, B-Lymphocyte
(immunology)
- Female
- Genetic Vectors
(immunology)
- Humans
- Mice
- Mice, Inbred BALB C
- Molecular Sequence Data
- Plasmodium yoelii
(immunology)
- Protozoan Proteins
(immunology)
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