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Recombinant Lactobacillus plantarum expressing HA2 antigen elicits protective immunity against H9N2 avian influenza virus in chickens

  • Applied genetics and molecular biotechnology
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Abstract

Low pathogenic H9N2 subtype avian influenza virus (AIV) can lead to moderate respiratory symptoms and low egg production rates in poultry. Due to its immunologic suppression, other various infectious pathogens give rise to the co-infection of hosts, causing heavy economic losses in the commercial poultry industry in both China and worldwide. Therefore, it is time to explore a novel, safe, and effective vaccine. We have already made use of the surface of Lactobacillus plantarum to display AIV HA2 (NC8-pSIP409-pgsA′-HA2), which demonstrated that it has a good immunogenicity. In this study, by evaluating the immune protection effect of NC8-pSIP409-pgsA′-HA2 on chickens, we found that the hemagglutination inhibition (HI) antibodies, specificity IgG antibody in chickens, the sIgA titer in broncho alveolar lavage fluids (BALF), and the T cell response were increased notably after oral vaccination with NC8-pSIP409-pgsA′-HA2. In addition, weight loss, lung titers, and lung pathologies were improved when chickens were orally vaccinated with NC8-pSIP409-pgsA′-HA2 after challenge with H9N2 AIV. This strategy lays the foundation for the development of recombinant L. plantarum oral vaccines in the prevention of AIV.

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Acknowledgments

This work was supported by the National Key Research and Development Program of China (2017YFD0501000), the National High-Tech R&D Program of China (863 program) (2013AA102806), National Natural Science Foundation of China (31672528, 31272541), Science and Technology Development Program of Jilin Province (20160519011JH, 20170204034NY), Special Funds for Industrial Innovation of Jilin Province (2016C063), “Thirteen Five-year Plan” for Sci & Tech Research Program of Jilin Education Department of P.R. China (JJKH20170318KJ), the Doctoral Project sponsored by the Scientific Research Foundation of Jilin Agricultural University of China (201601), and the Undergraduate Innovative Training Program of Jilin Province (301).

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Correspondence to Chun-Feng Wang.

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The authors declare that there are no competing interests.

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All applicable international and national guidelines for the care and use of chickens were followed.

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Yang, WT., Yang, GL., Yang, X. et al. Recombinant Lactobacillus plantarum expressing HA2 antigen elicits protective immunity against H9N2 avian influenza virus in chickens. Appl Microbiol Biotechnol 101, 8475–8484 (2017). https://doi.org/10.1007/s00253-017-8600-2

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  • DOI: https://doi.org/10.1007/s00253-017-8600-2

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