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Vet Res. 2019 May 2;50(1):32. doi: 10.1186/s13567-019-0649-8.

Spleen and head kidney differential gene expression patterns in trout infected with Lactococcus garvieae correlate with spleen granulomas.

Author information

1
Department of Animal Health, Faculty of Veterinary Sciences, Complutense University, Madrid, Spain.
2
INRA, Virologie et Immunologie Moléculaires, Université Paris-Saclay, Jouy-en-Josas, France.
3
Department of Biotechnology, Instituto Nacional Investigaciones Agrarias y Alimentarias, INIA, Madrid, Spain.
4
Department of Internal Medicine and Animal Surgery, Faculty of Veterinary Sciences, Complutense University, Madrid, Spain.
5
VISAVET Animal Health Surveillance Center, Complutense University, Madrid, Spain.
6
Department of Animal Health, Faculty of Veterinary Sciences, Complutense University, Madrid, Spain. gibelloa@vet.ucm.es.

Abstract

Lactococcus garvieae is a significant pathogen in aquaculture with a potential zoonotic risk. To begin to characterize the late immune response of trout to lactococcosis, we selected infected individuals showing clinical signs of lactococcosis. At the time lactococcosis clinical signs appeared, infection by L. garvieae induced a robust inflammatory response in the spleen of rainbow trout, which correlated with abundant granulomatous lesions. The response in kidney goes in parallel with that of spleen, and most of the gene regulations are similar in both organs. A correlation existed between the early inflammatory granulomas in spleen (containing macrophages with internalized L. garvieae) and up-regulated gene sets, which defined the presence of macrophages and neutrophils. This is the first analysis of the immune transcriptome of rainbow trout following L. garvieae infection during the initiation of adaptive immune mechanisms and shows a transcriptome induction of antibody response by both IgM (+) and IgT (+) spleen B cells to respond to systemic infection. These results increase our understanding of lactococcosis and pave the way for future research to improve control measures of lactococcosis on fish farms.

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