In vivo effects of Escherichia coli lipopolysaccharide on regulation of immune response and protein expression in striped catfish (Pangasianodon hypophthalmus)

Abstract : Lipolysaccharide (LPS), a component of outer membrane protein of gram-negative bacteria, reportedly stimulates fish immune system. However, mechanisms driving this immunomodulatory effect are yet unknown. To determine effects of Escherichia coli lipopolysaccharide on regulation of immune response and protein expression of striped catfish (Pangasianodon hypophthalmus), juvenile fish (20-25 g) were injected with 3, 15 or 45 mg E.coli LPS/kg and challenged with Edwardsiella ictaluri. Plasma cortisol and glucose were rather low and did not differ (p < 0.05) among treatments. All LPS treatments differed regarding blood cell count and immune variables such as plasma and spleen lysozyme, complement activity and antibody titer, 3 mg LPS/kg yielding best results; red blood cell count was not affected by LPS treatment. Accumulated mortalities after bacterial challenge were 23.4, 32.8, 37.7 and 52.5% for treatment 3, 15, 45 mg LPS/kg fish and control respectively. Proteomic analysis of peripheral blood mononuclear cells (PBMC) confirmed that LPS induced differentially over-expressed immune proteins such as complement component C3 and lysozyme C2 precursor. Regulation of other proteins such as Wap65, alpha-2 macroglobulin-3 and transferrin precursor was also demonstrated. Striped catfish injected with E.coli LPS enhanced innate immune responses.
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Fish and Shellfish Immunology, Elsevier, 2013, 34 (1), pp.339-347. 〈10.1016/j.fsi.2012.11.025〉
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https://hal.univ-lorraine.fr/hal-01561657
Contributeur : Urafpa Ul <>
Soumis le : jeudi 13 juillet 2017 - 10:52:47
Dernière modification le : jeudi 6 septembre 2018 - 11:58:01

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Bui Thi Bich Hang, Sylvain Milla, Virginie Gillardin, Nguyen Thanh Phuong, Patrick Kestemont. In vivo effects of Escherichia coli lipopolysaccharide on regulation of immune response and protein expression in striped catfish (Pangasianodon hypophthalmus). Fish and Shellfish Immunology, Elsevier, 2013, 34 (1), pp.339-347. 〈10.1016/j.fsi.2012.11.025〉. 〈hal-01561657〉

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