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Biotechnology Letters

, Volume 41, Issue 6–7, pp 867–872 | Cite as

Recombinant lactococcus lactis secreting viral protein 1 of enterovirus 71 and its immunogenicity in mice

  • Pengwei XuEmail author
  • Yinbiao Wang
  • Ling Tao
  • Xuan Wu
  • Weidong Wu
Original Research Paper
  • 159 Downloads

Abstract

Objective

To construct recombinant Lactococcus lactis (L. lactis) expressing viral protein 1 (VP1) of enterovirus 71 (EV71) and evaluate its immunogenicity to be used as an oral vaccine in BALB/c mice.

Results

Recombinant L. lactis competent in secreting VP1 (~ 30 kDa) into the extracellular environment with the aid of the signal peptide Usp45 was produced. Enzyme-linked immunosorbent assay showed that significant VP1-specific antibody response including the production of both serum IgG and fecal IgA (p < 0.05) was elicited in BALB/c mice upon oral immunization with recombinant L. lactis. Moreover, in contrast to negative control, recombinant L. lactis induced adequate neutralizing antibodies in mouse sera (p < 0.05) as demonstrated in virus neutralization assay, whereas the presence of neutralizing antibodies in fecal samples was obvious but not significant (p > 0.05).

Conclusions

Recombinant L. lactis expressing VP1 of EV71 has the potential to be used as an oral vaccine candidate. The findings may provide some preliminary evidences for further development of effective and needle-free EV71 vaccines.

Keywords

Enterovirus 71 Lactococcus lactis Viral protein 1 Vaccine 

Notes

Acknowledgements

This work was supported by the Key Scientific Research Project of Universities of Henan Province, China (Grant Nos. 19A330004 and 18B360012).

Compliance with ethical standards

Conflicts of interest

All authors declared that there is no conflict of interest.

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  • Pengwei Xu
    • 1
    Email author
  • Yinbiao Wang
    • 1
  • Ling Tao
    • 1
  • Xuan Wu
    • 2
  • Weidong Wu
    • 1
  1. 1.School of Public HealthXinxiang Medical UniversityXinxiangChina
  2. 2.School of Life ScienceSichuan UniversityChengduChina

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