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Functional and molecular mmune response of rainbow trout (Oncorhynchus mykiss) following challenge with Yersinia ruckeri


Funding: This research was supported by project BE4AQUAHEALTH: RASTREIO NACIONAL DE PATOLOGIAS DE PEIXES DE AQUACULTURA: UMA APOSTA NA PREVENÇÃO (MAR-02.05.01-FEAMP-0013), funded by Mar2020 Operational Programme and the European Union through FEDER and by Fundação para a Ciência e Tecnologia (FCT), through the strategic project UID/MAR/04292/2020 granted to MARE and within the scope of UIDB/04423/2020 and UIDP/04423/2020 granted to CIIMAR. BC was supported by FCT, Portugal (2020.00290.CEECIND).Currently, aquaculture production of rainbow trout (Oncorhynchus mykiss) is a multibillion dollar industry; nevertheless, the development of this sector has not been exempt from pitfalls related to the recurrent presence of pathogens of bacterial origin. This is the case of Yersinia ruckeri, the etiologic agent of the infectious pathology known as Enteric Red Mouth Disease (ERM), causing serious economic losses that can be as high as 30–70% of production. Although several studies have been performed regarding pathogen features and virulence factors, more information is needed about the host defense mechanism activation after infection. Given this perspective, this study aimed to evaluate rainbow trout’s short-term innate immune response against infection with Y. ruckeri. A series of factors linked to the innate immune response were evaluated, including determination of hematological parameters, oxidative stress biomarkers, and analysis of the expression of immunerelated genes. Results showed a significant decrease in several hematological parameters (white blood cell count, hematocrit, neutrophils, monocytes, lymphocytes, and thrombocytes) and oxidative stress indicators (SOD) between the control and infected groups. In addition, there were significant differences in the level of gene expression between infected individuals and the control group. Most of these genes (il-1b, il-8, il-10, tnf-a1, tnf-a2, socs3, mmp-9, cath, hsp-70, saa, fer, pcb) were upregulated within the first 24 h following infection. Results from this study showed more insights into the short-term immune response of rainbow trout to infection with Y. ruckeri, which may be useful for the establishment of biomarkers that may be used for the early detection of

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This paper was published in IC-online.

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