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Zhang W, Li B, Yu R, Xu W, Liu X, Su J, Yuan G. Hepcidin contributes to largemouth bass (Micropterus salmoides) against bacterial infections. Int J Biol Macromol 2024; 266:131144. [PMID: 38556234 DOI: 10.1016/j.ijbiomac.2024.131144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2023] [Revised: 01/16/2024] [Accepted: 03/24/2024] [Indexed: 04/02/2024]
Abstract
The increasing emergence and dissemination of bacterial pathogens in largemouth bass culture accelerate the desire for new treatment measures. Antimicrobial peptides as the host's antimicrobial source dominate the preferred molecules for discovering antibacterial agents. Here, the potential of Hepcidin-1 from largemouth bass (Micropterus salmoides) (MsHep-1) against bacterial infection is demonstrated. MsHep-1 not only improved the survival rate in infection experiments involving Nocardia seriolae (12 %) and Aeromonas hydrophila (18 %) but also coped with iron overload conditions in vivo. Moreover, the antibacterial activity of MsHep-1 in vitro was identified against both gram-negative and gram-positive bacteria. Mechanistic studies show MsHep-1 leads to bacterial death by changing the bacterial membrane potential and disrupting the bacterial membrane structure. These findings demonstrate that MsHep-1 may play an important role in the host response to bacterial infection. It provides promising strategies in the application of immunosuppression prevention and control in fish. AMPs may be a promising and available reservoir for treating the current bacterial diseases.
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Affiliation(s)
- Weixiang Zhang
- Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, Wuhan, 430070, China
| | - Bo Li
- Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, Wuhan, 430070, China
| | - Ruying Yu
- Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, Wuhan, 430070, China
| | - Wenyan Xu
- College of Animal Science and Technology, Henan University of Animal Husbandry and Economy, Zhengzhou, 450046, China
| | - Xiaoling Liu
- Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, Wuhan, 430070, China
| | - Jianguo Su
- Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, Wuhan, 430070, China
| | - Gailing Yuan
- Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, Wuhan, 430070, China.
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Wang P, Lin Z, Lin S, Dai Y, Zheng B, Zhang Y, Hu J. Molecular cloning of the hepcidin gene from crescent sweetlips (Plectorhinchus cinctus) and characterization of its encoded antimicrobial peptide. Mol Immunol 2023; 164:124-133. [PMID: 38000115 DOI: 10.1016/j.molimm.2023.11.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2023] [Revised: 10/21/2023] [Accepted: 11/18/2023] [Indexed: 11/26/2023]
Abstract
Hepcidin has been identified as an important antimicrobial peptide exerting important innate immunomodulatory activities in many fish species. In the present study, reverse transcription PCR coupled with the rapid amplification of cDNA ends was used to obtain the full-length cDNA of the crescent sweetlips hepcidin gene, which is 829 bp in length and includes an 273 bp ORF encoding a peptide with 90 amino acid residues. Sequence alignment showed a typical RXKR motif and eight conserved cysteine residues in the deduced amino acid sequences. Four disulfide bonds were predicted to form between these eight cysteines, which may stabilize the hairpin structure in hepcidin molecule. Furthermore, phylogenetic analysis showed that the deduced amino acid sequences of crescent sweetlips hepcidin had high sequence homology to hepcidins from fish species of Eupercaria. In addition, the crescent sweetlips hepcidin peptide demonstrated a strong antimicrobial activity in vitro against several types of pathogenic bacteria in fish. In conclusion, the obtained results suggested that crescent sweetlips hepcidin possessed the typical structure similar to other fish hepcidins and had strong antibacterial activity, which showed great potential in the prevention of fish diseases in aquaculture.
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Affiliation(s)
- Peixin Wang
- Engineering Research Centre of Fujian-Taiwan Special Marine Food Processing and Nutrition, Ministry of Education, Fuzhou, Fujian, 350002, China; College of Food Science, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Zhongjing Lin
- Engineering Research Centre of Fujian-Taiwan Special Marine Food Processing and Nutrition, Ministry of Education, Fuzhou, Fujian, 350002, China; College of Food Science, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Shaoling Lin
- Engineering Research Centre of Fujian-Taiwan Special Marine Food Processing and Nutrition, Ministry of Education, Fuzhou, Fujian, 350002, China; College of Food Science, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Yujie Dai
- College of Food Science, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Baodong Zheng
- Engineering Research Centre of Fujian-Taiwan Special Marine Food Processing and Nutrition, Ministry of Education, Fuzhou, Fujian, 350002, China; College of Food Science, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Yi Zhang
- Engineering Research Centre of Fujian-Taiwan Special Marine Food Processing and Nutrition, Ministry of Education, Fuzhou, Fujian, 350002, China; College of Food Science, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
| | - Jiamiao Hu
- College of Food Science, Fujian Agriculture and Forestry University, Fuzhou 350002, China; Department of Cardiovascular Sciences and Diabetes Research Centre, University of Leicester, Leicester LE1 7RH, United Kingdom.
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Hu Y, Kurobe T, Liu X, Zhang YA, Su J, Yuan G. Hamp Type-1 Promotes Antimicrobial Defense via Direct Microbial Killing and Regulating Iron Metabolism in Grass Carp ( Ctenopharyngodon idella). Biomolecules 2020; 10:biom10060825. [PMID: 32481513 PMCID: PMC7356000 DOI: 10.3390/biom10060825] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Revised: 05/24/2020] [Accepted: 05/26/2020] [Indexed: 12/18/2022] Open
Abstract
Hepcidin is an antimicrobial peptide and regulator of iron homeostasis which has two isoforms in most fishes and some mammals. Previous studies have reported that the two hepcidin isoforms have different roles. Hamp type-1 plays a regulatory role in iron metabolism and hamp type-2 mostly performs an antimicrobial role. In this study, we found that Ctenopharyngodon idella (C. idella) have only one hepcidin isoform (hamp type-1), which showed both broad-spectrum antibacterial and iron regulatory functions. C. idella hepcidin mature peptide (hepcidin-25) and truncated peptide (hepcidin-20) exhibited bactericidal activities against both Gram-positive and Gram-negative bacteria in a dose-dependent manner in part through membrane rupture and binding to bacterial genomic DNA. The data from challenge tests demonstrated that the administration of hepcidin-25 significantly reduced mortality rates of C. idella by A. hydrophila infection, probably due to direct bactericidal activities of the peptide and a reduction of iron content in the fish serum. In addition, a comparison between hepcidin-20 and -25 suggests that the N terminal 5 amino acids play a critical role in reducing iron content in fish serum. Our findings revealed an important role of hamp type-1 in maintaining iron homeostasis and fighting against bacterial infections, suggesting the hepcidin has implications for the prevention and control of bacterial infection in aquaculture.
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Affiliation(s)
- Yazhen Hu
- Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, Wuhan 430070, China; (Y.H.); (X.L.); (Y.-A.Z.); (J.S.)
- Hubei Engineering Technology Research Center for Aquatic Animal Disease Control and Prevention, Wuhan 430070, China
| | - Tomofumi Kurobe
- Department of Anatomy, Physiology and Cell Biology, School of Veterinary Medicine, University of California, Davis, CA 95616, USA;
| | - Xiaoling Liu
- Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, Wuhan 430070, China; (Y.H.); (X.L.); (Y.-A.Z.); (J.S.)
- Hubei Engineering Technology Research Center for Aquatic Animal Disease Control and Prevention, Wuhan 430070, China
| | - Yong-An Zhang
- Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, Wuhan 430070, China; (Y.H.); (X.L.); (Y.-A.Z.); (J.S.)
- Hubei Engineering Technology Research Center for Aquatic Animal Disease Control and Prevention, Wuhan 430070, China
| | - Jianguo Su
- Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, Wuhan 430070, China; (Y.H.); (X.L.); (Y.-A.Z.); (J.S.)
- Hubei Engineering Technology Research Center for Aquatic Animal Disease Control and Prevention, Wuhan 430070, China
| | - Gailing Yuan
- Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, Wuhan 430070, China; (Y.H.); (X.L.); (Y.-A.Z.); (J.S.)
- Hubei Engineering Technology Research Center for Aquatic Animal Disease Control and Prevention, Wuhan 430070, China
- Correspondence: ; Tel./Fax: +86-27-87285211
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Yu X, Gan Z, Wang Z, Tang X, Guo B, Du H. Increased Iron Availability Aggravates the Infection of Escherichia coli O157:H7 in Mice. Biol Trace Elem Res 2019; 190:457-465. [PMID: 30456562 DOI: 10.1007/s12011-018-1579-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Accepted: 11/12/2018] [Indexed: 02/08/2023]
Abstract
Iron plays an important role both in bacterial pathogenicity and in host defense mechanisms, which has frequently been underestimated. The primary purpose of this study was to investigate the influence of iron supplementation on the progression of bacterial infection. We used mice as an experimental model to supplement iron after Escherichia coli (E. coli) O157:H7 infection and found that iron supplementation exacerbated clinical symptoms of bacterial infection by increasing mortality and reducing body weight. Iron supplementation promoted the colonization of bacteria and enhanced inflammatory responses by increasing C-reaction protein level and the phagocytic capacity of PBMCs, as well as upregulating the expression of TNF-α and IL-1β in E. coli O157:H7-challenged mice. In vitro cell experiment confirmed that an excess of iron would enhance the growth of E. coli O157:H7 and worsen the outcome of bacterial infection. Therefore, it is certainly plausible that iron supplementation in bacterial infection may worsen rather than improve host outcome.
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Affiliation(s)
- Xin Yu
- Department of Anesthesia, Sir Run Run Shaw Hospital, Zhejiang University, Hangzhou, China
| | - Zhenshun Gan
- Key Laboratory of Animal Nutrition and Feed Science (Eastern of China), College of Animal Science, Zhejiang University, Hangzhou, China
| | - Zhenjie Wang
- Key Laboratory of Animal Nutrition and Feed Science (Eastern of China), College of Animal Science, Zhejiang University, Hangzhou, China
| | - Xueyou Tang
- Key Laboratory of Animal Nutrition and Feed Science (Eastern of China), College of Animal Science, Zhejiang University, Hangzhou, China
| | - Bingxiu Guo
- Key Laboratory of Animal Nutrition and Feed Science (Eastern of China), College of Animal Science, Zhejiang University, Hangzhou, China
| | - Huahua Du
- Key Laboratory of Animal Nutrition and Feed Science (Eastern of China), College of Animal Science, Zhejiang University, Hangzhou, China.
- College of Animal Sciences, Zhejiang University, 866 Yuhangtang Road, Hangzhou, 310058, China.
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Synthetic Porcine Hepcidin Exhibits Different Roles in Escherichia coli and Salmonella Infections. Antimicrob Agents Chemother 2017; 61:AAC.02638-16. [PMID: 28760901 DOI: 10.1128/aac.02638-16] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2016] [Accepted: 05/21/2017] [Indexed: 11/20/2022] Open
Abstract
Hepcidin, an antimicrobial peptide, was discovered to integrate diverse signals from iron status and an infection threat and orchestrate a series of host-protective responses. Several studies have investigated the antimicrobial role of hepcidin, but the results have been controversial. Here, we aimed to examine the role of hepcidin in bacterial adherence and invasion in vitro We found that porcine hepcidin could decrease the amount of the extracellular pathogen enterotoxigenic Escherichia coli (ETEC) K88 that adhered to cells because it caused the aggregation of the bacteria. However, addition of hepcidin to macrophages infected with the intracellular pathogen Salmonella enterica serovar Typhimurium enhanced the intracellular growth of the pathogen through the degradation of ferroportin, an iron export protein, and then the sequestration of intracellular iron. Intracellular iron was unavailable by use of the iron chelator deferiprone (DFO), which reduced intracellular bacterial growth. These results demonstrate that hepcidin exhibits different functions in extracellular and intracellular bacterial infections, which suggests that different defense strategies should be taken to prevent bacterial infection.
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