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Recombinant invasive Lactobacillus plantarum expressing the J subgroup avian leukosis virus Gp85 protein induces protection against avian leukosis in chickens

  • Applied Genetics and Molecular Biotechnology
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Abstract

Avian leukosis, caused by avian leukosis virus (ALV), is an infectious tumor disease and severely hinders the development of the poultry industry. The use of Lactobacillus plantarum (L. plantarum) could effectively alleviate viremia in the early period of J subgroup ALV (ALV-J) infection. In this study, an invasive L. plantarum NC8 expressing Gp85 protein of ALV-J was constructed. After chickens were orally administered the recombinant invasive NC8, the levels of expression of CD4+ and CD8+ T lymphocytes in peripheral blood and spleen by flow cytometry and the proliferation ability of splenocytes by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay were examined, and the contents of cytokines, the anti-ALV-J antibody in serum, and mucosal antibody sIgA in intestinal lavage fluid were detected by enzyme-linked immunosorbent assay (ELISA). The immunoprotective efficiency was evaluated by monitoring the infection rate, the percent of cloacal swabs and survival, body weight gain, the organ indexes, and relative virus loads after challenge with ALV-J. The results showed that the recombinant invasive strain (FnBPA-gp85) could promote the expression levels of the CD8+T cells in peripheral blood and spleen, the proliferation of splenocytes, the secretions of cytokines interleukin 2 (IL-2) and γ-interferon (IFN-γ), and the production of IgG and sIgA compared with the PBS and FnBPA control groups in chickens. The FnBPA-gp85 group was exhibited the highest immune protection against ALV-J infection. The above results indicated that the recombinant invasive NC8 could promote the cellular immunity, humoral immunity, and mucosal immunity responses in chicken and provide a new method for exploring the live vaccine against ALV-J.

Key points

The FnBPA-gp85 strain could enhance cellular immunity response.

The FnBPA-gp85 strain could improve the immune protection against ALV-J infection.

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Funding

This work was supported by the National Natural Science Foundation of China (31972646) and Key Laboratory of Prevention and Control Agents for Animal Bacteriosis (Ministry of Agriculture and Rural Affairs) (KLPCAAB-2021–04).

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Authors

Contributions

JL and YY conceived and designed research. JL, KG, DL, YZ, and XC conducted experiments. CW contributed the strains and plasmids. JL, KG, CF, XL, and YG analyzed data. KG wrote the manuscript and JL reviewed the manuscript. All authors read and approved the manuscript.

Corresponding author

Correspondence to Yuying Yang.

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All applicable international, national, and/or institutional guidelines for the care and use of animals were followed (People’s Republic of China Ministry of Health, document NO. 55, 2001).

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The authors declare no competing interests.

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Liu, J., Gao, K., Li, D. et al. Recombinant invasive Lactobacillus plantarum expressing the J subgroup avian leukosis virus Gp85 protein induces protection against avian leukosis in chickens. Appl Microbiol Biotechnol 106, 729–742 (2022). https://doi.org/10.1007/s00253-021-11699-9

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  • DOI: https://doi.org/10.1007/s00253-021-11699-9

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