Cytokine expression in the intestine of rainbow trout (Oncorhynchus mykiss) during infection with Aeromonas salmonicida

I. E. Mulder, S. Wadsworth, C. J. Secombes

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Gene expression of a number of cytokines in the intestine of rainbow trout (Oncorhynchus mykiss) was investigated after challenge with a pathogenic strain of Aeromonas salmonicida. Fish were exposed to A. salmonicida by immersion in a bacterial suspension (bath challenge) and tissue samples of the distal and proximal intestine were collected at days 0, 2, 4, 6 and 8 post-exposure. Head kidney tissue was also collected to assess the effect in a systemic immune tissue. A classic profile of pro-inflammatory cytokine upregulation was observed in the proximal intestine of fish infected by bath challenge, as determined by semi-quantitative RT-PCR. Expression of IL-1 beta, IL-8, TNF-alpha and IFN-gamma was increased in the proximal intestine. TGF-beta was significantly decreased in the distal intestine. In the head kidney, infection with A. salmonicida by bath challenge caused decreased expression levels of IL-1 beta, IL-8, TNF-alpha and TGF-beta. The results are discussed in the context of potential immune mechanisms in the gut to prevent infection. (c) 2007 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)747-759
Number of pages13
JournalFish & Shellfish Immunology
Issue number4
Publication statusPublished - Oct 2007


  • rainbow trout
  • intestine
  • cytokines
  • Aeromonas salmonicida
  • salmo-salar l.
  • Atlantic salmon
  • fugu-rubripes
  • recombinant IL-1-beta
  • Japanese pufferfish
  • vibrio-anguillarum
  • defense-mechanisms
  • SSP salmonicida
  • fish
  • interleukin-1-beta

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