Immune Responses in Pregnant Sows Induced by Recombinant Lactobacillus johnsonii Expressing the COE Protein of Porcine Epidemic Diarrhea Virus Provide Protection for Piglets against PEDV Infection.

Abstract

Porcine epidemic diarrhea (PED) induced by porcine epidemic diarrhea virus (PEDV) is an intestinal infectious disease in pigs that causes serious economic losses to the pig industry. To develop an effective oral vaccine against PEDV infection, we used a swine-origin Lactobacillus johnsonii (L. johnsonii) as an antigen delivery carrier. A recombinant strain pPG-T7g10-COE/L. johnsonii (L. johnsonii-COE) expressing COE protein (a neutralizing epitope of the viral spike protein) was generated. The immunomodulatory effect on dendritic cell in vitro and immunogenicity in pregnant sows was evaluated following oral administration. L. johnsonii-COE could activate monocyte-derived dendritic cell (MoDC) maturation and triggered cell immune responses. After oral vaccination with L. johnsonii-COE, levels of anti-PEDV-specific serum IgG, IgA, and IgM antibodies as well as mucosal secretory immunoglobulin A (SIgA) antibody were induced in pregnant sows. High levels of PEDV-specific SIgA and IgG antibodies were detected in the maternal milk, which provide effective protection for the piglets against PEDV infection. In summary, oral L. johnsonii-COE was able to efficiently activate anti-PEDV humoral and cellular immune responses, demonstrating potential as a vaccine for use in sows to provide protection of their piglets against PEDV.

• Authors: Dianzhong Zheng, Xiaona Wang, Ning Ju, Zhaorui Wang, Ling Sui, Li Wang, Xinyuan Qiao, Wen Cui, Yanping Jiang, Han Zhou, Yijing Li, Lijie Tang
• Journal: Viruses (Viruses) Vol. 14 Issue 1 (12 21 2021) ISSN: 1999-4915 [Electronic] Switzerland
• PMID: 35062210 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Antibodies, Viral
• Cytokines
• Epitopes
• Immunoglobulin A, Secretory
• Immunoglobulin G
• Recombinant Fusion Proteins
• Spike Glycoprotein, Coronavirus
• Vaccines, Synthetic
• Viral Vaccines

Topics

• Animals
• Antibodies, Viral (analysis, blood)
• CD4-Positive T-Lymphocytes (immunology)
• Colostrum (immunology)
• Coronavirus Infections (prevention & control, veterinary)
• Cytokines (blood, genetics, metabolism)
• Dendritic Cells (cytology, immunology)
• Epitopes
• Female
• Immunity, Maternally-Acquired
• Immunoglobulin A, Secretory (analysis)
• Immunoglobulin G (analysis)
• Lactobacillus johnsonii (genetics, immunology)
• Porcine epidemic diarrhea virus (immunology)
• Pregnancy
• Recombinant Fusion Proteins (immunology)
• Spike Glycoprotein, Coronavirus (genetics, immunology)
• Swine
• Swine Diseases (prevention & control)
• Th1 Cells (immunology)
• Vaccines, Synthetic (immunology)
• Viral Vaccines (immunology)