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  • Title: A member of the immunoglobulin superfamily, orange-spotted grouper novel immune gene EcVig, is induced by immune stimulants and type I interferon.
    Author: Yeh YC, Wang TY, Chou HY, Lin HY, Chen TY, Aoki T, Wang HC.
    Journal: Fish Shellfish Immunol; 2016 Nov; 58():415-422. PubMed ID: 27666189.
    Abstract:
    A novel grouper immune gene, EcVig was identified in orange-spotted grouper (Epinephelus coioides). We recently determined that EcVig expression can be induced by infection with nervous necrosis virus (NNV, an RNA virus), whereas NNV replication may be suppressed when EcVig was overexpressed. Although EcVig appeared to be involved in grouper antiviral activity, its immune effects have not been well characterized. In the present study, two PAMPs (pathogen-associated molecular patterns; lipopolysaccharides [LPS] and synthetic double-stranded RNA polyriboinosinic-polyribocytidylic acid [poly(I:C)]), as well as fish DNA virus (red sea bream iridovirus, RSIV; grouper iridovirus, GIV), were used to study EcVig responses in orange-spotted grouper. In addition, groupers were given recombinant type I interferon to determine whether EcVig expression was induced. Poly(I:C) rapidly induced substantial expression of EcVig, whereas LPS stimulation did not appear to have any effect in grouper intestine. Expression levels of total EcVig and other IFN-stimulated genes (ISGs) were all significantly increased after RSIV and GIV infection. Furthermore, stimulation of recombinant type I IFN also increased EcVig expression. We conclude that EcVig may be a novel IFN-stimulated gene that demonstrates an antiviral immune response.
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