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Int. J. Mol. Sci. 2016, 17(7), 1117; doi:10.3390/ijms17071117

Edwardsiella tarda Outer Membrane Protein C: An Immunogenic Protein Induces Highly Protective Effects in Flounder (Paralichthys olivaceus) against Edwardsiellosis

1
Laboratory of Pathology and Immunology of Aquatic Animals, Ocean University of China, 5 Yushan Road, Qingdao 266003, China
2
Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, No. 1 Wenhai Road, Aoshanwei Town, Jimo, Qingdao 266071, China
*
Author to whom correspondence should be addressed.
Academic Editor: Li Lin
Received: 6 June 2016 / Revised: 3 July 2016 / Accepted: 7 July 2016 / Published: 12 July 2016
(This article belongs to the Section Biochemistry, Molecular and Cellular Biology)
View Full-Text   |   Download PDF [3309 KB, uploaded 12 July 2016]   |  

Abstract

Outer membrane protein C of Edwardsiella tarda is a major cell surface antigen and it was identified to be an immunogenic protein by Western blot using flounder (Paralichthys olivaceus) anti-recombinant OmpC (rOmpC), and anti-E. tarda antibodies. rOmpC tested the immune protective effect against E. tarda challenge in a flounder model and produced a relative percentage of survival rate of 85%. The immune response of flounder induced by rOmpC was investigated, and the results showed that: (1) the levels of specific serum antibodies induced by rOmpC were significantly higher than the control group after the second week after immunization, and the peak level occurred at week five after immunization; (2) rOmpC could induce the proliferation of sIg+ lymphocytes, and the peak levels of sIg+ lymphocytes in blood, spleen, and pronephros occurred at 4–5 weeks after immunization; and (3) the MHCIIα, CD4-1, IL-1β, IL-6 and TNF-α genes were significantly induced after being injected with rOmpC. Taken together, these results demonstrated that rOmpC could evoke highly protective effects against E. tarda challenge and induce strong innate immune response and humoral immune response of flounder, which indicated that OmpC was a promising vaccine candidate against E. tarda infection. View Full-Text
Keywords: outer membrane protein C; Edwardsiella tarda; vaccine; flounder; immune response outer membrane protein C; Edwardsiella tarda; vaccine; flounder; immune response
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Liu, F.; Tang, X.; Sheng, X.; Xing, J.; Zhan, W. Edwardsiella tarda Outer Membrane Protein C: An Immunogenic Protein Induces Highly Protective Effects in Flounder (Paralichthys olivaceus) against Edwardsiellosis. Int. J. Mol. Sci. 2016, 17, 1117.

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