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Liu Z, Zhang S, Hu H, Wang H, Qiu Y, Dong M, Wang M, Cui Z, Cui H, Wang Y, He G. Construction of recombinant Lactococcus expressing thymosin and interferon fusion protein and its application as an immune adjuvant. Microb Cell Fact 2024; 23:40. [PMID: 38321474 PMCID: PMC10845779 DOI: 10.1186/s12934-024-02308-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2022] [Accepted: 01/16/2024] [Indexed: 02/08/2024] Open
Abstract
BACKGROUND In recent years, biosafety and green food safety standards have increased the demand for immune enhancers and adjuvants. In the present study, recombinant food-grade Lactococcus lactis (r-L. lactis-Tα1-IFN) expressing thymosin Tα1 and chicken interferon fusion protein was constructed. RESULTS The in vitro interactions with macrophages revealed a mixture of recombinant r-L. lactis-Tα1-IFN could significantly activate both macrophage J774-Dual™ NF-κB and interferon regulator (IRF) signaling pathways. In vitro interactions with chicken peripheral blood mononuclear cells (PBMCs) demonstrated that a mixture of recombinant r-L. lactis-Tα1-IFN significantly enhanced the expression levels of interferon (IFN)-γ, interleukin (IL)-10, CD80, and CD86 proteins in chicken PBMCs. Animal experiments displayed that injecting a lysis mixture of recombinant r-L. lactis-Tα1-IFN could significantly activate the proliferation of T cells and antigen-presenting cells in chicken PBMCs. Moreover, 16S analysis of intestinal microbiota demonstrated that injection of the lysis mixture of recombinant r-L. lactis-Tα1-IFN could significantly improve the structure and composition of chicken intestinal microbiota, with a significant increase in probiotic genera, such as Lactobacillus spp. Results of animal experiments using the lysis mixture of recombinant r-L. lactis-Tα1-IFN as an immune adjuvant for inactivated chicken Newcastle disease vaccine showed that the serum antibody titers of the experimental group were significantly higher than those of the vaccine control group, and the expression levels of cytokines IFN-γ and IL-2 were significantly higher than those of the vaccine control group. CONCLUSION These results indicate that food-safe recombinant r-L. lactis-Tα1-IFN has potential as a vaccine immune booster and immune adjuvant. This study lays the foundation for the development of natural green novel animal immune booster or immune adjuvant.
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Affiliation(s)
- Zengqi Liu
- College of Animal Science and Technology, Shihezi University, Shihezi, 832003, Xinjiang, China
| | - Suhua Zhang
- College of Animal Science and Technology, Shihezi University, Shihezi, 832003, Xinjiang, China
| | - Hongjiao Hu
- College of Animal Science and Technology, Shihezi University, Shihezi, 832003, Xinjiang, China
| | - He Wang
- College of Animal Science and Technology, Shihezi University, Shihezi, 832003, Xinjiang, China
| | - Yu Qiu
- Harbin Guosheng Biotechnology Co., Ltd, Harbin, 150028, China
| | - Mingqi Dong
- Harbin Guosheng Biotechnology Co., Ltd, Harbin, 150028, China
| | - Muping Wang
- Harbin Guosheng Biotechnology Co., Ltd, Harbin, 150028, China
| | - Ziyang Cui
- Clinical Medical College, Hebei North University, Zhangjiakou, 075000, China
| | - Hongyu Cui
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, 150069, China.
| | - Yunfeng Wang
- Harbin Guosheng Biotechnology Co., Ltd, Harbin, 150028, China.
| | - Gaoming He
- College of Animal Science and Technology, Shihezi University, Shihezi, 832003, Xinjiang, China.
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