Your browser doesn't support javascript.
loading
Immunoresponse of Coho salmon immunized with a gene expression library from Piscirickettsia salmonis
Miquel, Alvaro; Muller, Iilse; Ferrer, Pablo; Valenzuela, Pablo D. T; Burzio, Luis O.
  • Miquel, Alvaro; Fundacion Ciencia para la Vida. CL
  • Muller, Iilse; Fundacion Ciencia para la Vida. CL
  • Ferrer, Pablo; Fundacion Ciencia para la Vida. CL
  • Valenzuela, Pablo D. T; Fundacion Ciencia para la Vida. CL
  • Burzio, Luis O; Fundacion Ciencia para la Vida. CL
Biol. Res ; 36(3/4): 313-323, 2003. ilus, graf
Article in English | LILACS | ID: lil-356884
RESUMO
We have used the expression library immunization technology to study the protection of Coho salmon Oncorhynchus kisutch to the infection with Piscirickettsia salmonis. Purified DNA from this bacterium was sonicated and the fragments were cloned in the expression vector pCMV-Bios. Two libraries were obtained containing 22,000 and 28,000 colonies and corresponding to approximately 8 and 10 times the genome of the pathogen, respectively. On average, the size of the inserts ranged between 300 and 1,000 bp. The plasmid DNA isolated from one of these libraries was purified and 20 micrograms were injected intramuscularly into 60 fish followed by a second dose of 10 micrograms applied 40 days later. As control, fish were injected with the same amount of DNA of the vector pCMV-Bios without insert. The titer of IgM anti-P. salmonis of vaccinated fish, evaluated 60 days post-injection, was significantly higher than that of the control group injected with the vector alone. Moreover, this response was specific against P. salmonis antigens, since no cross reaction was detected with Renibacterium salmoninarum and Yersinia ruckeri. The vaccinated and control fish were challenged 60 days after the second dose of DNA with 2.5 x 10(7) P. salmonis corresponding to 7.5 times the LD50. At 30 days post-challenge, 100 per cent mortality was obtained with the control fish while 20 per cent of the vaccinated animals survived. All surviving fish exhibited a lower bacterial load in the kidney than control fish. The expression library was also tested in Balb/c mice and it was found that the humoral immune response was specific to P. salmonis and it was dependent on the amount of DNA injected.
Subject(s)
Full text: Available Index: LILACS (Americas) Main subject: Gene Expression / Gene Library / Immunization / Oncorhynchus kisutch Limits: Animals Language: English Journal: Biol. Res Journal subject: Biology Year: 2003 Type: Article Affiliation country: Chile Institution/Affiliation country: Fundacion Ciencia para la Vida/CL

Similar

MEDLINE

...
LILACS

LIS

Full text: Available Index: LILACS (Americas) Main subject: Gene Expression / Gene Library / Immunization / Oncorhynchus kisutch Limits: Animals Language: English Journal: Biol. Res Journal subject: Biology Year: 2003 Type: Article Affiliation country: Chile Institution/Affiliation country: Fundacion Ciencia para la Vida/CL