Preliminary study on the relationship between dexamethasone and pathogen susceptibility on crucian carp (Carassius auratus). (December 2016)

• Record Type: Journal Article
• Authors: QI, Xiao-Zhou; Li, Dong-Liang; Tu, Xiao; Song, Chen-Guang; Ling, Fei; Wang, Gao-Xue
• Is Part Of: Fish & shellfish immunology. Volume 59(2016:Dec.)
• Page Start: 18
• Page End: 24
• Publication Date: 2016-12
• Subjects: Crucian carp -- Dexamethasone -- Lysozyme -- Immune gene -- Susceptibility -- Aeromonas hydrophila; Fishes -- Immunology -- Periodicals; Shellfish -- Immunology -- Periodicals; Poissons -- Immunologie -- Périodiques; Crustacés -- Immunologie -- Périodiques; 571.9617
• DOI: 10.1016/j.fsi.2016.10.017
• Languages: English
• ISSNs: 1050-4648

Abstract

Abstract: Dexamethasone, a known immunosuppressant, can inhibit the immune response and increase the amount of pathogen in body, but the role of dexamethasone affecting susceptibility of crucian carp ( Carassius auratus ) to pathogen is unclear. The effects of dexamethasone on susceptibility of crucian carp to Aeromonas hydrophila were investigated in this study. The fish were divided into four groups randomly and injected intraperitoneally by dexamethasone for 0 day (group D), 3 days (group C), 6 days (group B), and 9 days (group A), respectively. The serum lysozyme activity was significantly declined in group A, B and C. Relative immune gene expression such as il - 1β, cxcl-8, tnfα and crp in kidney were down-regulation compared to group D. After that crucian carp were infected with A. hydrophila, crucian carp treated by dexamethasone had higher mortality (group A 95%, group B 76%, group C 31%) when compared to group D (4% mortality); the amount of pathogen in was significantly increased ( P < 0.05) in liver, kidney and spleen of fish in group A-C compared to group D. These results implicated that higher susceptibility caused by dexamethasone may be induced by the decrease of lysozyme activity and the down-regulation of some immune genes. Highlights: Dexamethasone could reduce the activity of lysozyme in serum. Lysozyme activity was inversely related to tissue bacterial levels. Dexamethasone inhibited the expression of IL-1β, TNFα, CXCL-8 and CRP in kidney. Dexamethasone could increase the susceptibility to infections with A. hydrophila .