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Type of publication: Journal Article
Type of document: Full Paper

Year: 2020

Authors: Saleh, M; Friedl, A; Srivastava, M; Secombes, CJ; El-Matbouli, M

Title: Modulation of local and systemic immune responses in brown trout (Salmo trutta) following exposure to Myxobolus cerebralis.

Source: Fish Shellfish Immunol. 2020; 106:844-851

Authors Vetmeduni Vienna:

El-Matbouli Mansour
Friedl Adina
Saleh Mona
Srivastava Mitaly

Vetmed Research Units
University Clinic for Poultry and Fish Medicine, Clinical Unit of Fish Medicine

Project(s): The role of SOCS Proteins in salmonid whirling disease

Myxobolus cerebralis, the etiological agent of Whirling Disease (WD), is a freshwater myxozoan parasite with considerable economic and ecological relevance for salmonids. There are differences in disease susceptibility between species and strains of salmonids. Recently, we have reported that the suppressor of cytokine signaling SOCS1 and SOCS3 are key in modulating rainbow trout (Oncorhynchus mykiss) immune responses and that resistant fish apparently exhibit effective Th17 cell response after exposure to M. cerebralis. It is unclear whether such molecules and pathways are also involved in the immune response of M. cerebralis infected brown trout (Salmo trutta). Hence, this study aimed to explore their role during immune modulation in infected brown trout, which is considered resistant to this parasite. Fish were exposed to the triactinomyxon (TAM) stages of M. cerebralis and quantitative real-time PCR (RT-qPCR) was carried out to examine local (caudal fin) and systemic (head kidney, spleen) immune transcriptional changes associated with WD over time in infected and control fish. All of the immune genes in the three tissues studied were differentially expressed in infected fish at multiple time points. Brown trout reduced the parasite load and demonstrated effective immune responses, likely by keeping pro-inflammatory and anti-inflammatory cytokines in balance whilst stimulating efficient Th17-mediated immunity. This study increases knowledge on the brown trout immune response to M. cerebralis and helps us to understand the underlying mechanisms of WD resistance.Copyright © 2020 The Authors. Published by Elsevier Ltd.. All rights reserved.

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