Identification and expression of the hepcidin gene from brown trout (Salmo trutta) and functional analysis of its synthetic peptide
文献类型： 外文期刊
作者： Huang, Tianqing 1 ; Gu, Wei 1 ; Wang, Bingqian 1 ; Zhang, Yuyong 1 ; Cui, Lili 2 ; Yao, Zuochun 1 ; Zhao, Cheng 1 ; Xu, G 1 ;
作者机构： 1.Chinese Acad Fishery Sci, Heilongjiang River Fisheries Res Inst, Harbin, Heilongjiang, Peoples R China
2.Yunnan Acad Fishery Sci, Kunming, Yunnan, Peoples R China
3.Yunnan Agr Univ, Coll Anim Sci & Technol, Kunming, Yunnan, Peoples R China
关键词： Brown trout; Hepcidin; Synthetic peptides; Antimicrobial activity
期刊名称：FISH & SHELLFISH IMMUNOLOGY （ 影响因子：4.581； 五年影响因子：4.851 ）
ISSN： 1050-4648
年卷期： 2019 年 87 卷
页码：
收录情况： SCI
摘要： Hepcidin, a hepatic antimicrobial peptide, is a key player of the nonspecific immune system. The structure of hepcidin gene from brown trout (Bthepc) has been characterized at the molecular level. The 1158-bp mRNA generates a coding sequence (CDS) of 267 bp, which encodes an 88-amino acid protein. Molecular evolution analysis classified Bthepc to the family Salmonidae. Amino acid sequence homologies between Bthepc and hepcidin in other species such as Oncorhynchus mykiss, Salmo solar, and Hucho taimen were found to be 93.18%, 96.59%, and 92.05% respectively. The mature peptide and the signal peptide of Bthepc are made of 25 and 24 amino acids, respectively. Similar to the other species, eight conserved cysteines in the mature peptide of Bthepc are held together by four disulphide bonds. Expression profiling of Bthepc indicated its highest expression in the liver. Further, iron levels or inflammation did not induce the age-dependent expression of Bthepc. Bthepc mRNA expression analysis in six immune tissues (liver, gill, spleen, skin, head kidney and intestine) indicated different levels of increase when challenged with Aeromonas salmonicida and Aeromonas hydrophda. The antimicrobial activity of synthetic Bthepc to typical pathogens was verified in vitro. In addition, Bthepc showed moderate haemolytic activity to mammalian erythrocytes. The antimicrobial activity of Bthepc was attributed to the disruption of the bacterial outer membrane integrity, which was evident from our scanning electron microscopy results. In summary, hepcidin gene of brown trout was characterized, and its antimicrobial activity was verified on different levels.
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