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Rainbow trout Oncorhynchus mykiss (Walbaum) type IV ice-structuring protein LS-12 in the acute-phase response to Flavobacterium psychrophilum infection.

A previous proteomic study examining the plasma acute-phase response of rainbow trout to sterile inflammation highlighted an unidentified 9.5-kDa spot using 2D-PAGE, which was dramatically increased. The 15 amino acid sequence obtained from this protein spot allowed rapid amplification of cDNA ends PCR to generate a 443-bp nucleotide sequence that was 98.6% similar to type-4 ice-structuring protein LS-12 from Atlantic salmon Salmo salar Linnaeus. Quantitative reverse translation PCR and an ELISA were used to measure gene expression and plasma concentrations of LS-12 following experimental intraperitoneal injection of rainbow trout with either 106 or 108 colony-forming units (CFU) of Flavobacterium psychrophilum. There was no significant change in the plasma concentration of LS-12 up to 15 days post-infection in any group. Hepatic LS-12 gene expression was significantly reduced at 3 and 6 days (p < 0.001) post-infection in fish injected with 108 CFU of F. psychrophilum relative to control fish, while branchial or head kidney expression was unchanged. Infected fish had significantly increased hepatic gene expression of serum amyloid A, confirming an acute-phase response. Under the conditions used, LS-12 is not a positive acute-phase protein in rainbow trout.