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| 论文摘要： | While robust interferon (IFN) responses in fish are critical for viral clearance, dysregulated signalling can trigger detrimental hyperinflammation, necessitating precise immunoregulatory mechanisms. This study identified Toll-interacting protein (TOLLIP) as a pivotal negative regulator of IFN production in grass carp (Ctenopharyngodon idella). Upon grass carp reovirus (GCRV) infection, TOLLIP expression increases significantly in tissues and cells. Furthermore, TOLLIP overexpression reduced GCRV- and polyinosinic-polycytidylic acid (poly I:C)-induced IFN expression, whereas tollip knockdown increased the cellular IFN production capacity. TOLLIP subsequently binds and degrades STING. Further mechanistic studies revealed that TOLLIP degrades STING in a dose-dependent manner via an autophagy-lysosome-dependent pathway. Interestingly, autophagy-related protein 5 (ATG5) was found to interact with TOLLIP and reduce TOLLIP-mediated STING degradation after atg5 knockdown. In addition, TOLLIP attenuated STING-driven IFN activation and compromised antiviral efficacy. These findings demonstrate that fish TOLLIP plays a specialized regulatory role in antiviral innate immunity, balancing immune defence with homeostasis maintenance. |
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