NKHs27, a sevenband grouper NK-Lysin peptide that possesses immunoregulatory and antimicrobial activity.

Fish Shellfish Immunol

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. Electronic address:

Published: May 2023

AI Article Synopsis

  • NK-Lysin, a broad-spectrum antimicrobial peptide, is gaining attention, but its functions and mechanisms are not fully understood; this study focuses on the NKHs27 peptide from the sevenband grouper.
  • NKHs27 exhibits significant antibacterial activity against both Gram-negative and Gram-positive bacteria and shows a synergistic effect when combined with other antibiotics, indicating its potential as a treatment.
  • Additionally, NKHs27 enhances immune responses in macrophages and improves the proliferation of leukocytes, and in vivo studies demonstrate its ability to reduce bacterial infection and spread, highlighting its potential application in aquaculture.

Article 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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Source
http://dx.doi.org/10.1016/j.fsi.2023.108715DOI Listing

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