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  • Title: Molecular cloning and functional characterization of RIP1 in large yellow croaker Larimichthys crocea.
    Author: Zou PF, Li KQ, Li Y, Shen YJ, Zhang ZP, Wang YL.
    Journal: Fish Shellfish Immunol; 2022 Mar; 122():386-398. PubMed ID: 35181446.
    Abstract:
    Receptor interacting protein 1 (RIP1) plays important roles not only in cell-death pathways but also in host innate immune responses. In the present study, a RIP1 ortholog named Lc-RIP1 was cloned and characterized in large yellow croaker (Larimichthys crocea). The open reading frame (ORF) of Lc-RIP1 is 2,046 bp, encoding a protein of 681 amino acids (aa), with an N-terminal kinase domain, an RHIM domain, and a C-terminal death domain. Subcellular localization analysis revealed that Lc-RIP1 was a cytosolic protein, which was broadly expressed in examined tissues/organs, and could be up-regulated under poly I:C, LPS, PGN, and Pseudomonas plecoglossicida stimulation in vivo based on qRT-PCR analysis. Notably, Lc-RIP1 could induce NF-κB, but not IRF3, IRF7 or type I IFN promoter activation. In addition, Lc-RIP1 overexpression could enhance Lc-MAVS, Lc-TRAF3, and Lc-TRAF6 mediated NF-κB promoter activation, and also Lc-TRIF and Lc-MAVS mediated IRF3 promoter activation, whereas suppress Lc-TRIF mediated NF-κB and type I IFN promoter activation, as well as Lc-TRAF3 and Lc-IRF3 mediated IRF3 promoter activation, Lc-IRF3 mediated type I IFN promoter activation and Lc-IRF7 mediated IRF7 promoter activation. These results collectively indicated that Lc-RIP1 function importantly in regulation of host innate immune signaling.
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