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Journal Article
Research Support, Non-U.S. Gov't
Identification of BAG5 from orange-spotted grouper (Epinephelus coioides) involved in viral infection.
Developmental and Comparative Immunology 2021 March
Bcl-2-associated athanogene 5 (BAG5) is a kind of molecular chaperone that can bind to the Bcl-2 and modulate cell survival. However, little is known about the functions of fish BAG5. In this study, we characterized a BAG5 homolog from orange-spotted grouper (Epinephelus coioides) gene (Ec-BAG5) and investigated its roles during viral infection. The Ec-BAG5 protein encoded 468 amino acids with four BAG domains, which shared high identities with reported BAG5. The highest transcriptional level of Ec-BAG5 was found in the peripheral blood lymphocyte (PBL). And the Ec-BAG5 expression were significantly up-regulated after red-spotted grouper nervous necrosis virus (RGNNV) or Lipopolysaccharide (LPS) stimulation in vitro. Furthermore, Ec-BAG5 overexpression could inhibited viral replication and the expression of viral genes (coat protein (CP) and RNA-dependent RNA polymerase (RdRp)). Also, overexpression of Ec-BAG5 significantly increased the expression of interferon pathway-related factors including interferon regulatory factor 3 (IRF3), interferon-stimulated gene 15 (ISG15), interferon-induced protein 35 (IFP35), myxovirus resistance gene 1 (Mx1) and inflammatory-related factors including tumor necrosis factor receptor-associated factor 6 (TRAF6), tumor necrosis factor-α (TNF-α), interleukin-1 beta (IL-1β), as well as the activities of NF-κB, ISRE and IFN-1. These data indicate that Ec-BAG5 can affect viral infection through regulating the expression of IFN- and inflammation-related factors, which provide useful information to better understand the immune response against viral infection.
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