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Evidence of immune and inflammatory processes in the gills of AGD-affected Atlantic salmon, Salmo salar L.


Pennacchi, Y and Leef, MJ and Crosbie, P and Nowak, BF and Bridle, AR, Evidence of immune and inflammatory processes in the gills of AGD-affected Atlantic salmon, Salmo salar L. , Proceedings of the Seventh International Symposium on Aquatic Animal Health, 31 August - 4 September, Portland, Oregon, USA, pp. 59. (2015) [Conference Extract]

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Amoebic gill disease (AGD) is a disease caused by the ectoparasite Neoparamoeba perurans which affects several cultured marine fish worldwide. The characterization of pro-inflammatory and immune related genes at the mRNA level in AGD-affected Atlantic salmon gills was performed at 10 days post-inoculation using 2D quantitative RT-PCR, a method of mapping transcriptional responses in tissues. This method is a variant of traditional quantitative RT-PCR whereby RNA was extracted and reverse transcribed from gill samples obtained using a biopsy punch from designated areas of the gill from fish. In theory this method could be used to map the transcriptional responses throughout the entire gill with the resolution of the mapped changes dependent on the number and size of gill subsamples. In the present study we restricted our subsample area to eight 2 mm biopsy punches from the dorsal portion of the second left gill arch of each individual fish. The genes of interest were IL-1β, TNF-α, TCR-α chain, CD8, CD4, MHC-IIα, MHC-I, IgM and IgT. A significant increase in expression of the mRNA of all the genes was observed in the gills of AGD-affected fish. Furthermore, a correlation analysis between CD8-α and TCR-α showed that the mRNA expression of these two genes was strongly positively correlated (r = 0.9). Contrary to previous studies, our data suggest that the parasite, N. perurans, elicits a classical inflammatory response in the gills of AGD-affected fish and indicates that the mRNA expression of immune genes within gill lesions misrepresents the cellular immune response in the gills during AGD.

Item Details

Item Type:Conference Extract
Keywords:AGD, immune-response, Atlantic salmon, inflammation
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Fisheries sciences
Research Field:Aquaculture
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - aquaculture
Objective Field:Fisheries - aquaculture not elsewhere classified
UTAS Author:Pennacchi, Y (Ms Ylenia Pennacchi)
UTAS Author:Leef, MJ (Dr Melanie Leef)
UTAS Author:Crosbie, P (Dr Philip Crosbie)
UTAS Author:Nowak, BF (Professor Barbara Nowak)
UTAS Author:Bridle, AR (Associate Professor Andrew Bridle)
ID Code:104995
Year Published:2015
Deposited By:IMAS Research and Education Centre
Deposited On:2015-12-02
Last Modified:2016-01-27

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