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Persistent immune responses in the heart determine the outcome of cardiomyopathy syndrome in Atlantic salmon (Salmo salar). | LitMetric

AI Article Synopsis

Article Abstract

Cardiomyopathy syndrome (CMS) caused by piscine myocarditis virus (PMCV) is a severe cardiac disease in Atlantic salmon (Salmo salar) and one of the leading causes of morbidity and mortality in the Norwegian aquaculture industry. Previous research suggest a variation in individual susceptibility to develop severe disease, however the role of the immune response in determining individual outcome of CMS is poorly understood particularly in cases where fish are also challenged by stress. The present study's aim was therefore to characterize cardiac transcriptional responses to PMCV infection in Atlantic salmon responding to infection under stressful conditions with a high versus low degree of histopathological damage. The study was performed as a large-scale controlled experiment of Atlantic salmon smolts from pre-challenge to 12 weeks post infection (wpi) with PMCV, during which fish were exposed to intermittent stressors. RNA sequencing (RNAseq) was used to compare the heart transcriptome of high responders (HR) with atrium histopathology score '4' and low responders (LR) with score '0.5' at 12 wpi. A high-throughput quantitative PCR (qPCR) analysis was used to compare immune gene transcription between individuals sampled at 6, 9 and 12 wpi. Based on RNAseq and qPCR results, RNAscope in situ hybridization (ISH) was performed for visualization of IFN-γ - and IFNb producing immune cells in affected heart tissue. Compared to LR, the transcription of 1592 genes was increased in HR at 12 wpi. Of these genes, around. 40 % were immune-related, including various chemokines, key antiviral response molecules, and genes. associated with a Th1 pro-inflammatory immune response. Further, the qPCR analysis confirmed. increased immune gene transcription in HR at both 9 and 12 wpi, despite a decrease in PMCV. transcription between these time points. Interestingly, increased IFNb transcription in HR suggests the. presence of high-quantity IFN secreting cells in the hearts of these individuals. Indeed, RNAscope. confirmed the presence of IFN-γ and IFNb-positive cells in the heart ventricle of HR but not LR. To conclude, our data indicate that in severe outcomes of PMCV infection various chemokines attract leucocytes to the salmon heart, including IFN-γ and IFNb-secreting cells, and that these cells play important roles in maintaining persistent antiviral responses and a sustained host immunopathology despite decreasing heart viral transcription.

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http://dx.doi.org/10.1016/j.fsi.2024.109404DOI Listing

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