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Immunization with recombinant aerolysin and haemolysin protected channel catfish against virulent Aeromonas hydrophila
Author(s) -
Zhang Dunhua,
Xu DeHai,
Shoemaker Craig A
Publication year - 2017
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/are.12931
Subject(s) - aerolysin , aeromonas hydrophila , catfish , virulence , biology , hemolysin , microbiology and biotechnology , immunization , recombinant dna , virology , immune system , immunology , fish <actinopterygii> , fishery , gene , biochemistry
Abstract Aeromonas hydrophila is emerging as one of the major concerns in catfish aquaculture in the Southeastern United States due to recent outbreaks of motile aeromonad septicaemia ( MAS ) caused by virulent clonal isolates. There is no effective vaccine currently available for the prevention of MAS . In this study, two virulence‐associated proteins of A. hydrophila , aerolysin and haemolysin, were heterologously expressed in Escherichia coli cells. Recombinant aerolysin (rArl) and haemolysin (rHly) were used to immunize catfish. Both rArl‐ and rHly‐induced humoral immune response as evidenced by immunoblotting and cell agglutination; immunized fish had significantly less mortality as compared to control fish upon challenge with virulent A. hydrophila . When a mixture of rArl and rHly was used to immunize the fish, significantly higher relative per cent survival ( RPS ) was obtained. Sustained RPS of 71–78% were observed at 2–5 weeks post immunization. The results of this study indicated that immunization against aerolysin and haemolysin had significant impact on the establishment of pathogenesis by A. hydrophila , suggesting that these two proteins could serve as general immunogens for future development of recombinant protein vaccines.