title: Comparison of Aeromonas salmonicida resistant and susceptible salmon families: a high immune response is beneficial for the survival against Aeromonas salmonicida challenge.
abstract: Selective breeding has been employed to improve resistance to infectious diseases in aquaculture and it is of importance to investigate the expression profiles of immune genes together with complement activity of Atlantic salmon with different genetic background in response to pathogens, in particular against Aeromonas salmonicida. This study examined acute phase products, and several central T cell cytokines and a transcription factor in different tissues, namely head kidney, spleen and liver, in two families of Atlantic salmon with high and low mortalities, after challenge by A. salmonicida. The results showed that the expression pattern of target genes differed in lymphoid and non-lymphoid organs in the two families. Generally, in lymphoid organs, higher expression of pro-inflammatory genes, such as TLR5M, TLR5S, GATA3, IFN-γ, IL-17D, as well as the pleiotropic cytokine gene IL-10 in the resistant family was observed at the same time point. One may speculate that a relatively high immune response is a pre-requisite for increased survival in a A. salmonicida challenge test. In addition, the resistant fish possessed higher complement activity pre-challenge compared to susceptible fish. Complement activity may be applied as an indicator in selective breeding for enhanced disease resistance.
authors.affiliation: Ministry of Education Key Laboratory of Biodiversity Science and Ecological Engineering, College of Life Sciences, Beijing Normal University(1), 100875 Beijing, China.
authors.forename: Zuobing
authors.initials: Z
authors.lastname: Zhang
authors.forename: Cuijuan
authors.initials: C
authors.lastname: Niu
authors.forename: Arne
authors.initials: A
authors.lastname: Storset
authors.forename: Jarl
authors.initials: J
authors.lastname: Bøgwald
authors.forename: Roy A
authors.initials: RA
authors.lastname: Dalmo
mesh_terms: D048409:Aeromonas salmonicida / Q000276:immunology*; D000818:Animals; D001483:Base Sequence; D016207:Cytokines / Q000235:genetics* / Q000276:immunology; D005393:Fish Diseases / Q000235:genetics* / Q000276:immunology / Q000382:microbiology; D029941:Fish Proteins / Q000235:genetics / Q000276:immunology; D005667:Furunculosis / Q000235:genetics* / Q000276:immunology / Q000382:microbiology; D015870:Gene Expression; D016905:Gram-Negative Bacterial Infections / Q000235:genetics / Q000276:immunology / Q000382:microbiology / Q000662:veterinary*; D007113:Immunity, Innate; D007668:Kidney / Q000276:immunology / Q000378:metabolism / Q000382:microbiology; D008099:Liver / Q000276:immunology / Q000378:metabolism / Q000382:microbiology; D008969:Molecular Sequence Data; D020317:Salmo salar / Q000235:genetics* / Q000276:immunology / Q000382:microbiology; D013154:Spleen / Q000276:immunology / Q000378:metabolism / Q000382:microbiology; D014157:Transcription Factors / Q000235:genetics* / Q000276:immunology
chemical_list: D016207:Cytokines; D029941:Fish Proteins; D014157:Transcription Factors