文献类型：期刊文献

英文题名：Isolation of a Virulent Aeromonas salmonicida subsp. masoucida Bacteriophage and Its Application in Phage Therapy in Turbot (Scophthalmus maximus)

作者：Xu, Zhenhe[1];Jin, Peng[1];Zhou, Xiangshan[1];Zhang, Yuanxing[1,2];Wang, Qiyao[1,3];Liu, Xiaohong[1,3];Shao, Shuai[1,3];Liu, Qin[1,3]

机构：[1]East China Univ Sci & Technol, State Key Lab Bioreactor Engn, Shanghai, Peoples R China;[2]Southern Marine Sci & Engn Guangdong Lab Zhuhai, Zhuhai, Peoples R China;[3]Shanghai Engn Res Ctr Maricultured Anim Vaccines, Shanghai, Peoples R China

年份：2021

卷号：87

期号：21

外文期刊名：APPLIED AND ENVIRONMENTAL MICROBIOLOGY

收录：;EI(收录号：20240315406300);WOS:【SCI-EXPANDED(收录号:WOS:000707925700017)】；

基金：This study was supported by grants from the Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) (311020005), the National Natural Science Foundation of China (32025038), and the Fundamental Research Funds for the Central Universities (22221062017019).

语种：英文

外文关键词：Aeromonas salmonicida subsp. masoucida; antibacterial; aquaculture; phage therapy; turbot; Scophthalmus maximus

摘要：Aeromonas salmonicida is an aquatic pathogen that can infect a variety of fish. Phage therapy has been applied to treat bacterial infections. In this study, we obtained three A. salmonicida subsp. masoucida phage isolates from sewage, and one phage (vB_AsM_ZHF) exhibited the best antibacterial effect, based on in vitro kinetics experiments. Sequencing indicated that the vB_AsM_ZHF genome is 161,887 bp (41.24% C+G content) with 237 predicted open reading frames. No antibiotic resistance or virulence genes were detected in the complete genome, which is a requirement for phage therapy safety. Intraperitoneal injection of phage vB_AsM_ZHF into turbot at 8 x 10(4) PFU/fish rescued turbot from A. salmonicida subsp. masoucida injection and reduced the bacterial burden by 1 order of magnitude. Injection of vB_AsM_ZHF also decreased levels of inflammatory cell infiltration in muscle tissue, cytokines interleukin-1 beta (IL-1 beta), tumor necrosis factor alpha (TNF-alpha), and gamma interferon (IFN-gamma) in serum and the expression of the inflammatory factors IL-1 beta, IL-6, IFN-gamma, transforming growth factor beta, TNF-alpha, and hepcidin in the liver, spleen, and head kidney of turbot. Phage vB_AsM_ZHF demonstrated antibacterial ability in vitro and in vivo and significantly reduced mortality in turbot challenged by A. salmonicida subsp. masoucida. This study revealed that phage vB_AsM_ZHF can effectively treat the infection caused by A. salmonicida subsp. masoucida in turbot. IMPORTANCE A. salmonicida is an aquatic pathogen that can infect different fish and causes economic loss to the global aquaculture industry. Clinical strains of A. salmonicida have developed multidrug resistance, and phage therapy is being evaluated for controlling bacterial infections. Phages are biological antibacterial agents and have the potential to be therapeutic agents against multidrug-resistant bacteria. In this study, three A. salmonicida subsp. masoucida phages were isolated from sewage, and their biological behaviors were characterized. The newly isolated phage vB_AsM_ZHF could inhibit A. saimonicida subsp. masoucida infection in vitro and in vivo, suggesting that it may be an alternative strategy to antibiotics for protecting fish against multidrug-resistant A. saimonicida subsp. masoucida in the aquaculture industry.