title: Immune responses to oral pcDNA-VP2 vaccine in relation to infectious pancreatic necrosis virus carrier state in rainbow trout Oncorhynchus mykiss.
abstract: The VP2 gene of infectious pancreatic necrosis virus, encoded in an expression plasmid and encapsulated in alginate microspheres, was used for oral DNA vaccination of fish to better understand the carrier state and the action of the vaccine. The efficacy of the vaccine was evaluated by measuring the prevention of virus persistence in the vaccinated fish that survived after waterborne virus challenge. A real-time RT-qPCR analysis revealed lower levels of IPNV-VP4 transcripts in rainbow trout survivors among vaccinated and challenged fish compared with the control virus group at 45 days post-infection. The infective virus was recovered from asymptomatic virus control fish, but not from the vaccinated survivor fish, suggesting an active role of the vaccine in the control of IPNV infection. Moreover, the levels of IPNV and immune-related gene expression were quantified in fish showing clinical infection as well as in asymptomatic rainbow trout survivors. The vaccine mimicked the action of the virus, although stronger expression of immune-related genes, except for IFN-1 and IL12, was detected in survivors from the virus control (carrier) group than in those from the vaccinated group. The transcriptional levels of the examined genes also showed significant differences in the virus control fish at 10 and 45 days post-challenge.
authors.affiliation: Centro de Investigaciones Biologicas (CSIC), Dpto Microbiologia Molecular y Biología de las Infecciones, C/ Ramiro de Maeztu 9, 28040 Madrid, Spain. Electronic address: nataliabal@cib.csic.es.
authors.forename: Natalia A
authors.initials: NA
authors.lastname: Ballesteros
authors.affiliation: Centro de Investigaciones Biologicas (CSIC), Dpto Microbiologia Molecular y Biología de las Infecciones, C/ Ramiro de Maeztu 9, 28040 Madrid, Spain. Electronic address: sylvia@cib.csic.es.
authors.forename: Sylvia
authors.initials: S
authors.lastname: Rodriguez Saint-Jean
authors.affiliation: Centro de Investigaciones Biologicas (CSIC), Dpto Microbiologia Molecular y Biología de las Infecciones, C/ Ramiro de Maeztu 9, 28040 Madrid, Spain. Electronic address: saraip@cib.csic.es.
authors.forename: Sara I
authors.initials: SI
authors.lastname: Perez-Prieto
mesh_terms: D000284:Administration, Oral; D000818:Animals; D018175:Birnaviridae Infections / Q000276:immunology / Q000517:prevention & control / Q000662:veterinary*; D005393:Fish Diseases / Q000276:immunology / Q000517:prevention & control*; D018061:Infectious pancreatic necrosis virus / Q000276:immunology*; D017686:Oncorhynchus mykiss / Q000276:immunology* / Q000821:virology; D060888:Real-Time Polymerase Chain Reaction / Q000662:veterinary; D019444:Vaccines, DNA / Q000276:immunology / Q000627:therapeutic use*; D015678:Viral Structural Proteins / Q000235:genetics / Q000276:immunology*; D014765:Viral Vaccines / Q000276:immunology / Q000627:therapeutic use*
chemical_list: C509831:VP2 protein, infectious pancreatic necrosis virus; D019444:Vaccines, DNA; D015678:Viral Structural Proteins; D014765:Viral Vaccines
keywords: DNA oral vaccination; Fish virus; IPNV carrier trout; Infectious pancreatic necrosis virus (IPNV); Persistent virus infection