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Recombinant ferritin-H induces immunosuppression in European sea bass larvae (Dicentrarchus labrax) rather than immunostimulation and protection against a Vibrio anguillarum infection
Yaacob, E.N.; De Geest, B.G.; Goethals, J.; Bajek, A.; Dierckens, K.; Bossier, P.; Vanrompay, D. (2018). Recombinant ferritin-H induces immunosuppression in European sea bass larvae (Dicentrarchus labrax) rather than immunostimulation and protection against a Vibrio anguillarum infection. Vet. Immunol. Immunopathol. 204: 19-27. https://hdl.handle.net/10.1016/j.vetimm.2018.09.001
In: Veterinary Immunology and Immunopathology. Elsevier: Tokyo; Oxford; Lausanne; New York; Shannon; Amsterdam. ISSN 0165-2427; e-ISSN 1873-2534, more
Peer reviewed article  

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Keywords
    Dicentrarchus labrax (Linnaeus, 1758) [WoRMS]; Vibrio anguillarum Bergeman, 1909 [WoRMS]
Author keywords
    Sea bass; Larvae; Gnotobiotic; Vibrio anguillarum; Ferritin; Innateimmunity

Authors  Top 
  • Yaacob, E.N., more
  • De Geest, B.G.
  • Goethals, J., more
  • Bajek, A.

Abstract
    Vibrio anguillarum causes high mortality in European sea bass (Dicentrarchus labrax) larviculture. In this study, we evaluated if the recombinant sea bass ferritin-H could stimulate the innate immune system of gnotobiotic European sea bass larvae resulting in protection against a V. anguillarum challenge. We also evaluated the effect of a V. anguillarum infection on the transcription of immune-related genes in gnotobiotic European sea bass larvae. Recombinant sea bass ferritin-H was produced, encapsulated in calcium alginate microparticles and orally delivered to sea bass larvae at seven days after hatching. Our results showed V. anguillarum caused an acute infection, resulting in high mortality. The infection significantly upregulated the expression of tlr3, tlr5, cas1, il1β, tnfα, mif, il10, cc1, cxcl8 at 18, 24 and 36 h post infection, but not of the chemokine receptor genes cxcr4 and ccr9. There was no protective effect of ferritin-H. Remarkably, ferritin-H caused significantly higher transcript levels for cxcr4 and ccr9. Sea bass ferritin-H was more likely involved in immune-suppression and results point in the direction of a negative regulation of CXCR4 resulting in inhibition of cell proliferation, differentiation and migration which is detrimental to innate immunity and might explain the non-protective effect of ferritin-H in fish larvae.

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