Construction of a eukaryotic expression plasmid encoding partial S gene fragments of the SARS-CoV and its potential utility as a DNA vaccine.

Abstract:

:The spike (S) protein, a main surface antigen of the SARS coronavirus (SARS-CoV), is considered to be one of the most important protective antigen candidates for targets for vaccine design against the virus. In this study, a secreted recombinant expression plasmid, pVAX-S1, encoding the partial S protein with a signal peptide, was constructed and used to immunize BALB/c mice through electroporation. It was demonstrated that the eukaryotic expression vector pVAX-S1 was successfully constructed by restriction enzyme and sequence analysis. The expressed protein could be detected specifically by Western blot analysis. The serum IgG level of the vaccine group mice was significantly higher than that of the corresponding control group at day 14 after vaccination (P < 0.05). The vaccine group demonstrated significantly higher S1 protein lymphocyte proliferation index (LPI) than the control groups (P < 0.05). Furthermore, in the experimental group, a decrease in the ratio of CD4(+) to CD8(+) T-lymphocytes and an increase level of IFN-gamma in serum were observed. However, interleukin-4 (IL-4) was not detectable in two groups. These results strongly demonstrated that the pVAX-S1 plasmid could induce humoral and cellular immune responses in mice, and may be a potential candidate for a DNA vaccine against the SARS coronavirus.

journal_name

DNA Cell Biol

journal_title

DNA and cell biology

authors

He H,Tang Y,Qin X,Xu W,Wang Y,Liu X,Liu X,Xiong S,Li J,Zhang M,Duan M

doi

10.1089/dna.2005.24.516

keywords:

subject

Has Abstract

pub_date

2005-08-01 00:00:00

pages

516-20

issue

8

eissn

1044-5498

issn

1557-7430

journal_volume

24

pub_type

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