Surface-displayed porcine epidemic diarrhea viral (PEDV) antigens on lactic acid bacteria.
In this report, for surface display of viral antigen on lactobacilli, we have developed a surface antigen display system using the poly-gamma-glutamate synthetase A protein (pgsA) of Bacillus subtilis as an anchoring matrix. Recombinant fusion proteins comprised of pgsA and neucleocapsid protein of PEDV were stably expressed in Lactobacillus casei. Surface location of fusion protein was verified by ELISA, immunofluoresence microscopy. Oral and intranasal inoculations of recombinant L. casei into pregnant sow and mice resulted in high levels of serum immunoglobuline G (IgG) and mucosal IgA, as demonstrated by rnELISA(recombinant N protein ELISA) using recombinant N protein. Absorbance of IgG in pregnant sow sera highly increased duration of the experiment. More importantly, the level of IgA in colostrum were increased significantly higher than that of IgG. The IgG levels of the piglets were increased after suckling colostrum secreted from sows previously inoculated recombinant L. casei. These results indicate that mucosal immunization with recombinant L. casei expressing PEDV N protein (neucleoprotein of PEDV) on its surface elicited high levels of mucosal IgA and circulation IgG immune responses against the antigen N of PEDV.
Hou
Xi-Lin
XL
College of Animal Science and Technology, Heilongjiang August First Land Reclamation University, Daqin 163319, China.
Yu
Li-Yun
LY
Liu
Jianzhu
J
Wang
Gui-Hua
GH
D000818:Animals; D000914:Antibodies, Viral / Q000276:immunology; D000956:Antigens, Viral / Q000235:genetics* / Q000276:immunology; D005260:Female; D005822:Genetic Vectors; D007780:Lacticaseibacillus casei / Q000235:genetics*; D051379:Mice; D008810:Mice, Inbred C57BL; D053485:Porcine epidemic diarrhea virus / Q000276:immunology*; D011994:Recombinant Proteins / Q000276:immunology; D014614:Vaccines, Synthetic / Q000276:immunology*; D014765:Viral Vaccines / Q000276:immunology*
D000914:Antibodies, Viral; D000956:Antigens, Viral; D011994:Recombinant Proteins; D014614:Vaccines, Synthetic; D014765:Viral Vaccines