文献类型：期刊文献

英文题名：CRP Involved in Nile Tilapia (Oreochromis niloticus) against Bacterial Infection

作者：Li, Qi[1];Jiang, Baijian[1];Zhang, Zhiqiang[1];Huang, Yongxiong[1];Xu, Zhou[1];Chen, Xinjin[1];Cai, Jia[1,2,3];Huang, Yu[1,2,3];Jian, Jichang[1,2,3]

机构：[1]Guangdong Ocean Univ, Coll Fishery, Guangdong Prov Key Lab Aquat Anim Dis Control & H, Zhanjiang 524094, Peoples R China;[2]Qingdao Natl Lab Marine Sci & Technol, Lab Marine Biol & Biotechnol, Qingdao 266003, Peoples R China;[3]Guangdong Prov Engn Res Ctr Aquat Anim Hlth Asses, Shenzhen 518116, Peoples R China

年份：2022

卷号：11

期号：8

外文期刊名：BIOLOGY-BASEL

收录：SCI-EXPANDED(收录号：WOS:000846084500001)、、WOS

基金：This research was funded by National Natural Science Foundation of China (No. U20A2065, 32073006, 32002426), National Key R&D Program of China (No. 2018YFD0900501), Fund of Southern Marine Science and Engineering Guangdong Laboratory (Zhanjiang) (No. ZJW-2019-06).

语种：英文

外文关键词：CRP; Nile tilapia; Streptococcus agalactiae; Aeromonas hydrophila

外文摘要：Simple Summary C-reactive protein (CRP) is an acute-phase protein that can be used as an early diagnostic marker for inflammation. Few CRPs have been isolated from teleost, and the specific immunological functions and mechanism of fish CRP have not been well-studied. Therefore, in this research, a CRP gene from Nile tilapia was identified, and its roles during bacterial infection were investigated. The current results revealed that CRP participated in anti-bacterial immune response through agglutinating bacterial, regulating phagocytosis and inflammation. Hopefully, our data might be beneficial in further study to understand the protective mechanism of fish CRP against bacterial infection. C-reactive protein (CRP) is an acute-phase protein that can be used as an early diagnostic marker for inflammation, which is also an evolutionarily conserved protein and has been identified from arthropods to mammals. However, the roles of CRP during the immune response of Nile tilapia (Oreochromis niloticus) remain unclear. In this study, a CRP gene from Nile tilapia (On-CRP) was identified, and its roles in response to bacterial infection were investigated in vivo or in vitro. On-CRP was found to contain an open reading frame of 675 bp, encoding a polypeptide of 224 amino acids with the conservative pentraxin domain. On-CRP shares more than 50% of its identity with other fish species, and 30% of its identity with mammals. The transcriptional level of On-CRP was most abundant in the liver and its transcripts can be remarkably induced following Streptococcus agalactiae and Aeromonas hydrophila infection. Furthermore, in vitro analysis indicated that the recombinant protein of On-CRP improved phagocytic activity of monocytes/macrophages, and possessed a bacterial agglutination activity in a calcium-dependent manner. Both in vivo and in vitro experiments indicated that On-CRP could promote inflammation and activate the complement pathway. However, a direct relationship between CRP and several immune pathways could not be confirmed. The present data lays a theoretical foundation to further explore the mechanism of how CRP protects fish against bacterial infection.