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CpG oligodeoxynucleotides up-regulate antibacterial systems and induce protection against bacterial challenge in

Allison C Carrington1, Christopher J Secombes

  • 1Scottish Fish Immunology Research Centre, School of Biological Sciences, University of Aberdeen, Tillydrone Avenue, Aberdeen, UK.

Fish & Shellfish Immunology
|April 27, 2007
PubMed

Insights

Unmethylated CpG oligodeoxynucleotides (ODN) boost rainbow trout survival against bacterial infections. These CpG ODNs also enhance immune responses, acting as standalone treatments or vaccine adjuvants.

Area of Science:

  • Immunology
  • Aquaculture
  • Fish health

Background:

  • CpG oligodeoxynucleotides (ODN) are known immune stimulants in mammals.
  • Their impact on fish immune systems, particularly in aquaculture species like rainbow trout, is less understood.

Purpose of the Study:

  • To investigate the effects of CpG ODN on rainbow trout (Oncorhynchus mykiss) immune responses and survival.
  • To evaluate CpG ODN as a prophylactic agent and vaccine adjuvant in rainbow trout.

Main Methods:

  • Rainbow trout were challenged with bacteria, with some groups receiving CpG ODN as a prophylactic or with a commercial vaccine.
  • Serum lysozyme activity was measured in vivo.
  • Chemoattractant factor production by head kidney (HK) leucocytes was assessed in vitro.

Main Results:

  • CpG ODN significantly improved rainbow trout survival rates after bacterial challenge.
  • Both standalone CpG ODN and CpG ODN as a vaccine adjuvant enhanced survival.
  • In vivo serum lysozyme activity increased, and in vitro chemoattractant factor production was stimulated.

Conclusions:

  • CpG ODN effectively enhances the innate and adaptive immune responses in rainbow trout.
  • CpG ODN shows potential as a valuable tool for improving fish health and disease resistance in aquaculture.

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