Development of a subunit vaccine containing recombinant Riemerella anatipestifer outer membrane protein A and CpG ODN adjuvant

作者：Chu Chun Yen; Liu Chia Hui; Liou Jhong Jie; Lee Jai Wei; Cheng Li Ting^*

来源：Vaccine, 2015, 33(1): 92-99.

DOI：10.1016/j.vaccine.2014.11.010

• Riemerella anatipestifer
• OmpA
• CpG adjuvant
• Subunit vaccine
• Duck

Riemerella anatipestifer, a Gram-negative bacillus, causes septicemia that can result in high mortality for ducklings. In this study, we evaluated the immune response and protective efficacy provided by a subunit vaccine containing recombinant outer membrane protein A (rOmpA) and plasmid constructs containing CpG oligodeoxynucleotides (ODN). Results showed that CpG ODN enhanced both humoral and cell-mediated immunity elicited by rOmpA as early as two weeks after primary immunization. When compared to ducks immunized with rOmpA, ducks immunized with rOmpA+ CpG ODN showed higher levels (p <0.05) of antibody titer, T cell proliferation, and percentages of CD4(+) and CDS T cell in peripheral blood mononuclear cells (PBMCs). The relative fold inductions of mRNA expression of Th1-type (IFN-gamma and IL-12), and Th2-type (IL-6) cytokines in PBMCs isolated from ducks immunized with rOmpA + CpG ODN were significantly higher than those of the rOmpA group. Homologous challenge result showed that the rOmpA+ CpG ODN vaccine reduced the pathological score by 90% in comparison with the saline control. In conclusion, our study found that CpG ODN can enhance both humoral and cellular immunity elicited by a rOmpA vaccine. The rOmpA + CpG ODN vaccine can be further developed as a subunit vaccine against R. anatipestifer.

• 出版日期2015-1-1