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. 2009 Feb 24;8(2):231–237. doi: 10.1016/S1671-2927(09)60031-6

Studies on Mucosal Immunity Induced by Transmissible Gastroenteritis Virus Nucleocapsid Protein Recombinant Lactobacillus casei in Mice and Sow

Gui-hua WANG a,*, Xi-lin HOU b,**, Li-yun YU a, Jian-kui LIU a, Chun-hua WEI a
PMCID: PMC7128779  PMID: 32288751

Abstract

Mucosal immunity plays an important role in protecting pigs against transmissible gastroenteritis virus (TGEV) infection. To elicit mucosal immune response against TGEV, we developed a surface antigen display system using the poly-[.gamma]-glutamate synthetase A (pgsA) protein of Bacillus subtilis as an anchoring matrix to express recombinant fusion proteins of pgsA and nucleocapsid protein of TGEV in Lactobacillus casei. Surface location of fusion protein was verified by ELISA and indirect immunofluorescence test. Oral and intranasal inoculations of pregnant sow and mice with recombinant L. casei resulted in high levels of serum immunoglobulin G (IgG) and secretory immunoglobulin A (sIgA) against recombinant N protein as demonstrated by ELISA. More importantly, the level of specific sIgA in colostrum significantly increased compared with that of IgG. The serum IgG levels of the piglets increased after suckling colostrum produced by sows was previously inoculated with recombinant L. casei. These results indicate that immunization with recombinant L. casei expressing TGEV N protein on its surface elicited high levels of specific sIgA and circulating IgG against TGEV N protein.

Key words: transmissible gastroenteritis viral, lactic acid bacteria, N protein

Contributor Information

Gui-hua WANG, Email: wgh645@163.com.

Xi-lin HOU, Email: houxilin@hlau.cn.

Li-yun YU, Email: yuliyun@hlau.cn.

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