Protection against Vibrio alginolyticus in pearl gentian grouper (âEpinephelus fuscoguttatus × âEpinephelus lanceolatu) immunized with an acfA-deletion live attenuated vaccine.
Fish Shellfish Immunol
; 86: 875-881, 2019 Mar.
Article
en En
| MEDLINE
| ID: mdl-30572128
ABSTRACT
Vibrio alginolyticus is well-known as an opportunistic Gram-negative pathogen, which endangers the development of global aquaculture as well as human health. In this study, a ΔacfA mutant strain and complementation of the ΔacfA mutant (C-acfA) were constructed. The ΔacfA mutant was tested in pearl gentian grouper (âEpinephelus fuscoguttatusâ¯×â¯âEpinephelus lanceolatu) to observe the changes in virulence and evaluate its potential as an attenuated live vaccine. The results showed that the ΔacfA mutant caused a high antibody titer and a significant reduction in the ability to colonize the intestine of pearl gentian grouper. Grouper vaccinated with ΔacfA mutant were more tolerant of the infection by virulent V. alginolyticus HY9901 without inducing clinical symptoms and obvious pathological changes. The relative percent survival value of pearl gentian grouper vaccinated with ΔacfA mutant intraperitoneal injection reached 81.1% after challenging with V. alginolyticus HY9901. The specific antibody titers immunized with ΔacfA was significantly higher than that in the PBS group. The antibody titer of ΔacfA group displayed the tendency of rising up from the first to fourth week and declining from fifth to eighth week and reached the peak at the fourth week. In the meanwhile, the expression level of genes associated with immunity, including IL-1ß, TNF-α, IL-16, IgM, CD8α and MHC-Iα, was up-regulated after vaccination, indicating that the ΔacfA can induce effective and durable immune response in pearl gentian grouper and it may be an effective attenuated live vaccine candidate for the prevention of infections by V. alginolyticus.
Palabras clave
Texto completo:
1
Base de datos:
MEDLINE
Asunto principal:
Vibriosis
/
Lubina
/
Vacunas Bacterianas
/
Vacunación
/
Vibrio alginolyticus
/
Enfermedades de los Peces
Idioma:
En
Revista:
Fish Shellfish Immunol
Asunto de la revista:
BIOLOGIA
/
MEDICINA VETERINARIA
Año:
2019
Tipo del documento:
Article