Membrane attack complex-associated molecules from redlip mullet (Liza haematocheila): Molecular characterization and transcriptional evidence of C6, C7, C8β, and C9 in innate immunity. Issue 81 (October 2018)

• Record Type: Journal Article
• Authors: Liyanage, D.S.; Omeka, W.K.M.; Godahewa, G.I.; Lee, Seongdo; Nam, Bo-Hye; Lee, Jehee
• Is Part Of: Fish & shellfish immunology. Issue 81(2018)
• Page Start: 1
• Page End: 9
• Publication Date: 2018-10
• Subjects: Immune challenge -- Membrane attack complex -- Redlip mullet -- Terminal complement components; Fishes -- Immunology -- Periodicals; Shellfish -- Immunology -- Periodicals; Poissons -- Immunologie -- Périodiques; Crustacés -- Immunologie -- Périodiques; 571.9617
• DOI: 10.1016/j.fsi.2018.07.006
• Languages: English
• ISSNs: 1050-4648

Abstract

Abstract: The redlip mullet ( Liza haematocheila ) is one of the most economically important fish in Korea and other East Asian countries; it is susceptible to infections by pathogens such as Lactococcus garvieae, Argulus spp., Trichodina spp., and Vibrio spp. Learning about the mechanisms of the complement system of the innate immunity of redlip mullet is important for efforts towards eradicating pathogens. Here, we report a comprehensive study of the terminal complement complex (TCC) components that form the membrane attack complex (MAC) through in-silico characterization and comparative spatial and temporal expression profiling. Five conserved domains (TSP1, LDLa, MACPF, CCP, and FIMAC) were detected in the TCC components, but the CCP and FIMAC domains were absent in MuC8β and MuC9. Expression analysis of four TCC genes from healthy redlip mullets showed the highest expression levels in the liver, whereas limited expression was observed in other tissues; immune-induced expression in the head kidney and spleen revealed significant responses against Lactococcus garvieae and poly I:C injection, suggesting their involvement in MAC formation in response to harmful pathogenic infections. Furthermore, the response to poly I:C may suggest the role of TCC components in the breakdown of the membrane of enveloped viruses. These findings may help to elucidate the mechanisms behind the complement system of the teleosts innate immunity. Highlights: Liza haematocheila C6, C7, C8β and C9 were characterized. TSP1, LDLa, MACPF, CCP and FIMAC domains were detected in TCCs. LPS, Lactococcus garvieae and poly I:C were used as immune stimulants. Spatial and temporal mRNA expression was evaluated.