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Archives of Virology

, Volume 158, Issue 5, pp 1071–1077 | Cite as

Oral immunization of mice using Bifidobacterium longum expressing VP1 protein from enterovirus 71

  • Zhijian Yu
  • Zhen Huang
  • Chongwen Sao
  • Yuanjian Huang
  • Fan Zhang
  • Guihong Ma
  • Zhong Chen
  • Zhongming Zeng
  • Deng QiwenEmail author
  • Weiseng ZengEmail author
Original Article

Abstract

Bifidobacterium longum is an attractive candidate for delivering biologically active proteins by the mucosal route due to its non-pathogenic and colonizing properties. Enterovirus 71 (EV71) has aroused widespread attention recently due to several epidemics, and great attention should be paid to the fact that there are currently no effective antiviral drugs or vaccines against EV71 infection. In this report, we described a recombinant B. longum that could be used to develop an oral vaccine against EV71 infection. A VP1 expression vector (pBBADs-VP1) was constructed by amplifying the EV71 VP1 gene and inserting it into the E. coliBifidobacterium shuttle expression vector pBBAD/Xs. Then, the expression of VP1 protein in pBBADs-VP1-transformed bacteria was demonstrated by western blot. In vivo studies indicated that oral immunization of BALB/c mice with pBBADs-VP1-transformed bacteria induced potent immune responses against EV71 infection, including virus-neutralising titers, anti-EV71-VP1 antibody and the induction of Th1 immune responses in the spleen and Peyer’s patches. Importantly, immunization of mother mice with this recombinant VP1-expressing B. longum conferred protection to neonatal mice. These results demonstrate that the novel oral vaccine utilizing B. longum expressing the VP1 protein might successfully elicit a specific immune response against EV71 infection.

Keywords

Green Fluorescent Protein Neonatal Mouse EV71 Infection Neutralization Assay Oral Immunization 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Abbreviations

EV71

Enterovirus 71

IFN-γ

Interferon-γ

TNF-α

Tumor necrosis factor α

GFP

Green fluorescent protein

MNCs

Mononuclear cells

IPTG

Isopropyl β-D-thiogalactopyranoside

BSA

Bovine serum albumin

PPs

Peyer’s patches

B. longum

Bifidobacterium longum

TCID

Tissue culture infectious dose

CPE

Cytopathic effect

Notes

Acknowledgments

This work was supported by two grants from Shenzhen Scientific Research Program of the People’s Republic of China (no. 200801020 and no. 201001023) and Science and Technology Planning Project of Guangdong Province, China (no. 2010B011000005).

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer-Verlag Wien 2012

Authors and Affiliations

  • Zhijian Yu
    • 1
  • Zhen Huang
    • 1
  • Chongwen Sao
    • 2
  • Yuanjian Huang
    • 2
  • Fan Zhang
    • 1
  • Guihong Ma
    • 1
  • Zhong Chen
    • 1
  • Zhongming Zeng
    • 1
  • Deng Qiwen
    • 1
    Email author
  • Weiseng Zeng
    • 2
    Email author
  1. 1.Department of Infectious DiseasesThe Affiliated Shenzhen Nanshan Hospital of Guangdong Medical CollegeShenzhenChina
  2. 2.Department of Cell BiologySouthern Medical UniversityGuangzhouChina

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