Luo Z, Qin YK, Zhao K, Nan XY, Li WW, Li EC, Wang Q. Caspar negatively regulates anti-bacterial immunity by controlling the nuclear translocation of Relish in Chinese mitten crab (Eriocheir sinensis).
Fish Shellfish Immunol 2023;
136:108714. [PMID:
36990260 DOI:
10.1016/j.fsi.2023.108714]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2022] [Revised: 02/23/2023] [Accepted: 03/26/2023] [Indexed: 06/19/2023]
Abstract
Caspar, a homolog of the Fas-associated factor 1 (FAF1) family, contains an N-terminal ubiquitin interaction domain, a ubiquitin-like self-association domain, and a C-terminal ubiquitin regulatory domain. Caspar has been reported to be involved in the antibacterial immunity of Drosophila, which is unclear whether it is involved in the antibacterial immune process of crustaceans. In this article, we identified a Caspar gene in Eriocheir sinensis and named it EsCaspar. EsCaspar positively respond to bacterial stimulation and downregulate the expression of certain associated antimicrobial peptides by inhibiting the nuclear translocation of EsRelish. Thus, EsCaspar might be a suppressor of the immune deficiency (IMD) pathway that prevents over-activation of the immune system. Indeed, excess EsCaspar protein in crabs reduced resistance to bacterial infection. In conclusion, EsCaspar is a suppressor of the IMD pathway in crabs that plays a negative regulatory role in antimicrobial immunity.
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