title: Characterization of an immune deficiency homolog (IMD) in shrimp (Fenneropenaeus chinensis) and crayfish (Procambarus clarkii).
abstract: The immune deficiency (IMD) signal pathway mediates immunity against Gram-negative bacteria in Drosophila. Recent studies show that the IMD pathway also involves in antiviral innate immune responses. The functions of the pathway in crustacean immunity are largely unknown. In this paper, two IMDs (FcIMD and PcIMD), one of the key elements of the IMD pathway, were identified from Chinese white shrimp Fenneropenaeus chinensis and red swamp crayfish Procambarus clarkii. Both proteins have a death domain located at the C-terminal. FcIMD was mainly expressed in the gills and stomach and PcIMD was mainly detected in the heart, hepatopancreas, and stomach. FcIMD peaked in hemocytes at 12 h after white spot syndrome virus (WSSV) challenge and it peaked in the gills at 6 h after WSSV challenge, but it was decreased at 2 h and kept the low level to 24 h in hemocytes and no obviously change in gill after Vibrio anguillarum challenge. PcIMD first decreased in hemocytes at 2 h and peaked at 12 h in hemocytes after V. anguillarum challenge. It was also upregulated in gill after bacterial challenge, peaked at 2 h, and decreased at 6 h, and then gradually increased at 12-24 h. PcIMD has no significant change in hemocytes and gill after WSSV challenge. Western blot analysis detected FcIMD protein in all tissues, and immunocytochemical analysis localized FcIMD in the cytoplasm of hemocytes. RNA interference analysis showed that the IMD pathway was involved in regulating the expression of three kinds AMP genes, including crustins, anti-lipopolysaccharide factors and lysozymes, in shrimp and crayfish. They are Cru 1, Cru 2, ALF 1, ALF 2 and Lys 1 in crayfish, and Cru1, Cru 3, ALF 6, ALF 8, and Lys2 in shrimp. These results suggest that although IMD distribution and expression patterns have some differences, the IMD pathway may have conserved function for AMP regulation in shrimp and crayfish immunity against Gram-negative bacteria.
authors.affiliation: The Key Laboratory of Plant Cell Engineering and Germplasm Innovation of Ministry of Education/Shandong Provincial Key Laboratory of Animal Cells and Developmental Biology, School of Life Sciences, Shandong University, Jinan, Shandong 250100, China.
authors.forename: Jiang-Feng
authors.initials: JF
authors.lastname: Lan
authors.forename: Jing
authors.initials: J
authors.lastname: Zhou
authors.forename: Xiao-Wen
authors.initials: XW
authors.lastname: Zhang
authors.forename: Zong-Heng
authors.initials: ZH
authors.lastname: Wang
authors.forename: Xiao-Fan
authors.initials: XF
authors.lastname: Zhao
authors.forename: Qian
authors.initials: Q
authors.lastname: Ren
authors.forename: Jin-Xing
authors.initials: JX
authors.lastname: Wang
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D003400:Astacoidea / Q000235:genetics / Q000276:immunology* / Q000382:microbiology / Q000821:virology; D001483:Base Sequence; D003445:Crustacea / Q000235:genetics / Q000276:immunology* / Q000382:microbiology / Q000821:virology; D003593:Cytoplasm / Q000235:genetics / Q000276:immunology / Q000382:microbiology / Q000821:virology; D004266:DNA Virus Infections / Q000276:immunology; D005880:Gills / Q000276:immunology / Q000382:microbiology / Q000821:virology; D006434:Hemocytes / Q000276:immunology / Q000382:microbiology / Q000821:virology; D008969:Molecular Sequence Data; D010802:Phylogeny; D016415:Sequence Alignment; D014733:Vibrio / Q000276:immunology; D014735:Vibrio Infections / Q000276:immunology; D046848:White spot syndrome virus 1 / Q000276:immunology
keywords: Antimicrobial peptides; Crustacean; Immune deficiency; Innate immunity; RNA interference; Signal transduction pathway