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Wang CB, Yan X, Wang GH, Liu WQ, Wang Y, Hao DF, Liu HM, Zhang M. NKHs27, a sevenband grouper NK-Lysin peptide that possesses immunoregulatory and antimicrobial activity. FISH & SHELLFISH IMMUNOLOGY 2023; 136:108715. [PMID: 37001746 DOI: 10.1016/j.fsi.2023.108715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2023] [Revised: 03/22/2023] [Accepted: 03/26/2023] [Indexed: 06/19/2023]
Abstract
As an effective and broad-spectrum antimicrobial peptide, NK-Lysin is attracted more and more attention at present. However, the functions and action mechanism of NK-Lysin peptides are still not comprehensive enough at present. In this study, a sevenband grouper (Hyporthodus septemfasciatus) NK-Lysin peptide, NKHs27, was identified and synthesized, and its biological functions were studied. The results indicated that NKHs27 shares 44.44%∼88.89% overall sequence identities with other teleost NK-Lysin peptides. The following antibacterial activity assay exhibited that NKHs27 was active against both Gram-negative and Gram-positive bacteria, including Staphylococcus aureus, Listonella anguillarum, Vibrio parahaemolyticus and Vibrio vulnificus. Additionally, NKHs27 showed a synergistic effect when it was combined with rifampicin or erythromycin. In the process of interaction with the L. anguillarum cells, NKHs27 changed the cell membrane permeability and retained its morphological integrity, then penetrated into the cytoplasm to act on genomic DNA or total RNA. Then, in vitro studies showed that NKHs27 could enhance the respiratory burst ability of macrophages and upregulate immune-related genes expression in it. Moreover, NKHs27 incubation improved the proliferation of peripheral blood leukocytes significantly. Finally, in vivo studies showed that administration of NKHs27 prior to bacterial infection significantly reduced pathogen dissemination and replication in tissues. In summary, these results provide new insights into the function of NK-Lysin peptides in teleost and support that NKHs27, as a novel broad-spectrum antibacterial peptide, has potential applications in aquaculture against pathogenic infections.
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Affiliation(s)
- Chang-Biao Wang
- School of Marine Science and Engineering, Qingdao Agricultural University, Qingdao, Shandong Province, 266109, China
| | - Xue Yan
- School of Marine Science and Engineering, Qingdao Agricultural University, Qingdao, Shandong Province, 266109, China
| | - Guang-Hua Wang
- School of Marine Science and Engineering, Qingdao Agricultural University, Qingdao, Shandong Province, 266109, China
| | - Wen-Qing Liu
- School of Marine Science and Engineering, Qingdao Agricultural University, Qingdao, Shandong Province, 266109, China
| | - Yue Wang
- School of Marine Science and Engineering, Qingdao Agricultural University, Qingdao, Shandong Province, 266109, China
| | - Dong-Fang Hao
- School of Marine Science and Engineering, Qingdao Agricultural University, Qingdao, Shandong Province, 266109, China
| | - Hong-Mei Liu
- School of Marine Science and Engineering, Qingdao Agricultural University, Qingdao, Shandong Province, 266109, China
| | - Min Zhang
- School of Marine Science and Engineering, Qingdao Agricultural University, Qingdao, Shandong Province, 266109, China; Laboratory for Marine Biology and Biotechnology, Pilot National Laboratory for Marine Science and Technology, Qingdao, Shandong Province, 266109, China.
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Tong S, Shi N, Zheng K, Yin Z, Zhang X, Liu Y. Genomic Variant in NK-Lysin Gene Is Associated with T Lymphocyte Subpopulations in Pigs. Genes (Basel) 2022; 13:1985. [PMID: 36360222 PMCID: PMC9689794 DOI: 10.3390/genes13111985] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Revised: 10/26/2022] [Accepted: 10/28/2022] [Indexed: 02/11/2024] Open
Abstract
As an antimicrobial peptide, NK-lysin (NKL) plays an important role in the innate immune system of organisms. In this study, 300 piglets (68 Landrace pigs, 158 Large White pigs and 74 Songliao Black pigs) were used to further explore the function of NLK gene in porcine immune system. The quantitative real-time PCR analysis detected the NKL gene's expression, and the result demonstrated that NKL mRNA was expressed in lung, spleen, stomach, kidney, liver and heart, and the expression level decreased sequentially. A single-nucleotide polymorphism (SNP, g.59070355 G > A) in intron 3 of the NKL gene was detected by PCR amplification and sequencing. The results of the Chi-square (χ2) test showed that the genotype of the SNP was consistent with the Hardy-Weinberg equilibrium. What's more, association analysis results showed the SNP in NKL gene was significantly associated with T lymphocyte subpopulations. Different genotypes had significant effects on the proportion of CD4-CD8-, CD4-CD8+, CD4+CD8+, CD8+, CD4+/CD8+ in peripheral blood (p < 0.05). These results further suggested that NKL could be recognized as a promising immune gene for swine disease resistance breeding.
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Affiliation(s)
- Shifeng Tong
- Department of Animal Genetics and Breeding, College of Animal Science and Technology, National Experimental Teaching Demonstration Center of Animal Science, Nanjing Agricultural University, Nanjing 210095, China
| | - Ningkun Shi
- Department of Animal Genetics and Breeding, College of Animal Science and Technology, National Experimental Teaching Demonstration Center of Animal Science, Nanjing Agricultural University, Nanjing 210095, China
| | - Kaichen Zheng
- Department of Animal Genetics and Breeding, College of Animal Science and Technology, National Experimental Teaching Demonstration Center of Animal Science, Nanjing Agricultural University, Nanjing 210095, China
| | - Zongjun Yin
- College of Animal Science and Technology, Anhui Agricultural University, Hefei 230036, China
| | - Xiaodong Zhang
- College of Animal Science and Technology, Anhui Agricultural University, Hefei 230036, China
| | - Yang Liu
- Department of Animal Genetics and Breeding, College of Animal Science and Technology, National Experimental Teaching Demonstration Center of Animal Science, Nanjing Agricultural University, Nanjing 210095, China
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Wherry TLT, Dassanayake RP, Bannantine JP, Mooyottu S, Stabel JR. Vitamin D3 alters macrophage phenotype and endosomal trafficking markers in dairy cattle naturally infected with Mycobacterium avium subsp. paratuberculosis. Front Cell Infect Microbiol 2022; 12:1021657. [PMID: 36275033 PMCID: PMC9579537 DOI: 10.3389/fcimb.2022.1021657] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2022] [Accepted: 09/20/2022] [Indexed: 11/22/2022] Open
Abstract
Macrophages are important host defense cells in ruminant paratuberculosis (Johne’s Disease; JD), a chronic enteritis caused by Mycobacterium avium subsp. paratuberculosis (MAP). Classical macrophage functions of pathogen trafficking, degradation, and antigen presentation are interrupted in mycobacterial infection. Immunologic stimulation by 25-hydroxyvitamin D3 (25(OH)D3) and 1,25-dihydroxyvitamin D3 (1,25(OH)2D3) enhances bovine macrophage function. The present study aimed to investigate the role of vitamin D3 on macrophage phenotype and endosomal trafficking of MAP in monocyte-derived macrophages (MDMs) cultured from JD-, JD+ subclinical, and JD+ clinically infected cattle. MDMs were pre-treated 100 ng/ml 25(OH)D3 or 4 ng/ml 1,25(OH)2D3 and incubated 24 hrs with MAP at 10:1 multiplicity of infection (MOI). In vitro MAP infection upregulated pro-inflammatory (M1) CD80 and downregulated resolution/repair (M2) CD163. Vitamin D3 generally decreased CD80 and increased CD163 expression. Furthermore, early endosomal marker Rab5 was upregulated 140× across all stages of paratuberculosis infection following in vitro MAP infection; however, Rab5 was reduced in MAP-activated MDMs from JD+ subclinical and JD+ clinical cows compared to healthy controls. Rab7 expression decreased in control and clinical cows following MDM infection with MAP. Both forms of vitamin D3 reduced Rab5 expression in infected MDMs from JD- control cows, while 1,25(OH)2D3 decreased Rab7 expression in JD- and JD+ subclinical animals regardless of MAP infection in vitro. Vitamin D3 promoted phagocytosis in MDMs from JD- and JD+ clinical cows treated with either vitamin D3 analog. Results from this study show exogenous vitamin D3 influences macrophage M1/M2 polarization and Rab GTPase expression within MDM culture.
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Affiliation(s)
- Taylor L. T. Wherry
- Infectious Bacterial Diseases, National Animal Disease Center, United States Department of Agriculture - Agricultural Research Service (USDA-ARS), Ames, IA, United States
- Department of Veterinary Pathology, College of Veterinary Medicine, Iowa State University, Ames, IA, United States
| | - Rohana P. Dassanayake
- Ruminant Diseases and Immunology, National Animal Disease Center, United States Department of Agriculture - Agricultural Research Service (USDA-ARS), Ames, IA, United States
| | - John P. Bannantine
- Infectious Bacterial Diseases, National Animal Disease Center, United States Department of Agriculture - Agricultural Research Service (USDA-ARS), Ames, IA, United States
| | - Shankumar Mooyottu
- Department of Veterinary Pathology, College of Veterinary Medicine, Iowa State University, Ames, IA, United States
| | - Judith R. Stabel
- Infectious Bacterial Diseases, National Animal Disease Center, United States Department of Agriculture - Agricultural Research Service (USDA-ARS), Ames, IA, United States
- *Correspondence: Judith R. Stabel,
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Dassanayake RP, Atkinson BM, Mullis AS, Falkenberg SM, Nicholson EM, Casas E, Narasimhan B, Bearson SMD. Bovine NK-lysin peptides exert potent antimicrobial activity against multidrug-resistant Salmonella outbreak isolates. Sci Rep 2021; 11:19276. [PMID: 34588573 PMCID: PMC8481502 DOI: 10.1038/s41598-021-98860-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Accepted: 09/14/2021] [Indexed: 01/07/2023] Open
Abstract
Multidrug-resistant (MDR) Salmonella is a threat to public health. Non-antibiotic therapies could serve as important countermeasures to control MDR Salmonella outbreaks. In this study, antimicrobial activity of cationic α-helical bovine NK-lysin-derived antimicrobial peptides was evaluated against MDR Salmonella outbreak isolates. NK2A and NK2B strongly inhibited MDR Salmonella growth while NK1 and NK2C showed minimum-to-no growth inhibition. Scrambled-NK2A, which is devoid of α-helicity but has the same net positive charge as NK2A, also failed to inhibit bacterial growth. Incubation of negatively charged MDR Salmonella with NK2A showed increased Zeta potential, indicating bacterial-peptide electrostatic attraction. Confocal and transmission electron microscopy studies revealed NK2A-mediated damage to MDR Salmonella membranes. LPS inhibited NK2A-mediated growth suppression in a dose-dependent response, suggesting irreversible NK2A-LPS binding. LPS-NK2A binding and bacterial membrane disruption was also confirmed via electron microscopy using gold nanoparticle-NK2A conjugates. Finally, NK2A-loaded polyanhydride nanoparticles showed sustained peptide delivery and anti-bacterial activity. Together, these findings indicate that NK2A α-helicity and positive charge are prerequisites for antimicrobial activity and that MDR Salmonella killing is mediated by direct interaction of NK2A with LPS and the inner membrane, leading to bacterial membrane permeabilization. With further optimization using nano-carriers, NK2A has the potential to become a potent anti-MDR Salmonella agent.
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Affiliation(s)
- Rohana P Dassanayake
- Agricultural Research Service, National Animal Disease Center, Ruminant Diseases and Immunology Research Unit, USDA, Ames, IA, USA.
| | - Briony M Atkinson
- Agricultural Research Service, National Animal Disease Center, Food Safety and Enteric Pathogens Research Unit, USDA, Ames, IA, USA
| | - Adam S Mullis
- Department of Chemical and Biological Engineering and Nanovaccine Institute, Iowa State University, Ames, IA, USA
| | - Shollie M Falkenberg
- Agricultural Research Service, National Animal Disease Center, Ruminant Diseases and Immunology Research Unit, USDA, Ames, IA, USA
| | - Eric M Nicholson
- Virus and Prion Research Unit, National Animal Disease Center, Agricultural Research Service, United States Department of Agriculture, Ames, IA, USA
| | - Eduardo Casas
- Agricultural Research Service, National Animal Disease Center, Ruminant Diseases and Immunology Research Unit, USDA, Ames, IA, USA
| | - Balaji Narasimhan
- Department of Chemical and Biological Engineering and Nanovaccine Institute, Iowa State University, Ames, IA, USA
| | - Shawn M D Bearson
- Agricultural Research Service, National Animal Disease Center, Food Safety and Enteric Pathogens Research Unit, USDA, Ames, IA, USA.
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