Journal
MOLECULAR IMMUNOLOGY
Volume 81, Issue -, Pages 26-34Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.molimm.2016.11.017
Keywords
Procambarus clarkii; Ficolin; Vibrio parahaemolyticus; Innate immunity
Categories
Funding
- National Natural Science Foundation of China [31502199, 31572657, 31372563]
- Fundamental Research Funds for the Central Universities [2662015QC019, 2662015JC009]
- Undergraduate Innovation Fund Project by Huazhong Agricultural University [201610504050, 2015BC003]
- Special funds for the science and industry development from the Administration of Ocean and Fisheries of Guangdong Province [A201512C003]
- Special fund for fish diseases prevention and therapy from Guangdong province [2015-115]
- Special fund for Science and technology from Hubei Province [2015BBA228]
- Wuhan Science and Technology Bureau [2016020101010089]
- Innovative research team project of Hainan Natural Science Foundation [2016CXTD005]
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In invertebrates, ficolin-like proteins (FLPs) play important roles in innate immunity against pathogens. Previous studies primarily investigated the functions of FLPs in immune recognition, activation, and regulation. However, limited research has examined the functions of FLPs as immune effectors. In this work, a ficolin-like protein was identified in red swam crayfish (Procambarus clarkii) and designated as PcFLP1. Quantitative RT-PCR and western blot were employed to analyze the distribution and expression profiles of PcFLP1 in the tissues of the crayfish. The results indicated that PcFLP1 was present in all tested tissues, including hemocytes, heart, hepatopancreas, gill, stomach, and mid-intestine. The expression level of PcFLP1 was up-regulated in hemocytes, hepatopancreas and mid-intestines of the crayfish challenged with Vibrio parahaemolyticus. Further study demonstrated that PcFLP1 could protect the hepatopancreatic cells of crayfish from V. parahaemolyticus infection. The recombinant PcFLP1 enhanced bacterial elimination in crayfish, whereas the antibacterial action was inhibited after PcFLP1 was knocked down. Furthermore, PcFLP1 could bound to bacteria and inhibited bacterial replication. These results demonstrated that PcFLP1 plays an important role in the anti-Vibrio immunity of red swamp crayfish. (C) 2016 Elsevier Ltd. All rights reserved.
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