Diverse effects of nitric oxide reductase NorV on Aeromonas hydrophila virulence-associated traits under aerobic and anaerobic conditions

This study provides insights into an unexplored area of NorV, which will contribute to our understanding of bacterial pathogenesis and the development of new control strategies forA. hydrophila infection.
Source: Veterinary Research - Category: Veterinary Research Source Type: research

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In this study, we isolated four strains of B. velezensis, named C-11, S-22, L-17 and S-14 from apparently healthy Crucian carp, which exerted a broad-spectrum antimicrobial activity inhibiting both Gram-positive and Gram-negative bacteria especially the fish pathogens. B. velezensis isolates showed typical Bacillus characteristics by endospore staining, physiological and biochemical test, enzyme activity analysis (amylase, protease, and lipase), and molecular identification. Here, Bacillus-containing dietary was orally administrated to Crucian carp for 8 weeks before A. veronii challenge. Immunological parameters and the e...
Source: Frontiers in Microbiology - Category: Microbiology Source Type: research
Publication date: Available online 12 November 2019Source: Fish &Shellfish ImmunologyAuthor(s): Miao Li, Fang-Chao Hu, Fang Qiao, Zhen-Yu Du, Mei-Ling ZhangAbstractWith the development of aquaculture industry, high-carbohydrate diet is used to stimulate protein-sparing effect and reduce feed cost. However, fish utilize carbohydrates poorly in general, and instead, high level of carbohydrates in the diet influence the growth condition of fish. How to alleviate the side effects of high carbohydrate diet on fish health has attracted more and more attentions. In the present study, Nile tilapia (Oreochromis niloticus) were ...
Source: Fish and Shellfish Immunology - Category: Biology Source Type: research
Publication date: Available online 12 November 2019Source: Fish &Shellfish ImmunologyAuthor(s): Rosa León, María Ruiz, Yulema Valero, Constanza Cárdenas, Fanny Guzman, Marta Vila, Alberto CuestaAbstractAntimicrobial peptides (AMPs) form part of the innate immune response, which is of vital importance in fish, especially in eggs and early larval stages. Compared to antibiotics, AMPs show action against a wider spectrum of pathogens, including viruses, fungi and parasites, are more friendly to the environment, and do not seem to generate resistance in bacteria. Thus, we have tested in vitro the poten...
Source: Fish and Shellfish Immunology - Category: Biology Source Type: research
Publication date: Available online 11 November 2019Source: Fish &Shellfish ImmunologyAuthor(s): Zhouyi Zhang, Weijia Zhang, Changkao Mu, Ronghua Li, Weiwei Song, Yangfang Ye, Ce Shi, Lei Liu, Huan Wang, Chunlin WangAbstractGalectins are a family of β-galactoside-binding lectins that play key roles in the invertebrate innate immunity system, but no galectin genes have been identified in the mud crab (Scylla paramamosain) so far. The present study is the first to clone a galectin gene (SpGal) from S. paramamosain, by the rapid amplification of cDNA ends technique based on expressed sequence tags. The full-length cDN...
Source: Fish and Shellfish Immunology - Category: Biology Source Type: research
Abstract Quorum sensing (QS), bacterial cell-to-cell communication, is a gene regulatory mechanism that regulates virulence potential and biofilm formation in many pathogens. Aeromonas sobria, a common aquaculture pathogen, was isolated and identified by our laboratory from the deteriorated turbot, and its potential for virulence factors and biofilm production was regulated by QS system. In view of the interference with QS system, this study was aimed to investigate the effect of methyl anthranilate at sub-Minimum Inhibitory Concentrations (sub-MICs) on QS-regulated phenotypes in A. sobria. The results suggested t...
Source: Food Microbiology - Category: Food Science Authors: Tags: Food Microbiol Source Type: research
This study investigated the effect of phytic acid and lysozyme on the microbial composition and quality of grass carp (Ctenopharyngodon idellus) fillets stored at 4 °C. The control, 0.5 mg/mL lysozyme-treated fillets (T1), 0.5 mg/mL phytic acid-treated fillets (T2) and 0.25 mg/mL lysozyme + 0.25 mg/mL phytic acid-treated fillets (T3) were evaluated based on sensory assessment, biogenic amines, ATP-related compounds, total volatile basic nitrogen (TVB-N), and total viable counts (TVC). Changes in microbial composition were analyzed using high-throughput sequencing. Results showed that phytic acid and lyso...
Source: Food Microbiology - Category: Food Science Authors: Tags: Food Microbiol Source Type: research
Abstract Aeromonas spp. are opportunistic pathogenic bacteria related to an assembly of infectious diseases in ornamental fish. In the present study, virulence properties and antibiotic susceptibility of 52 guppy-borne Aeromonas spp. were investigated. The isolates were identified as A. veronii (n = 34), A. dhakensis (n = 10), A. hydrophila (n = 3), A. caviae (n = 3) and A. enteropelogenes (n = 2) by gyrB gene sequencing. The gyrB sequence deviation within and among the species ranged from 0 to 2.6% and 2.7-9.2%. Each species formed a distinct g...
Source: Archives of Microbiology - Category: Microbiology Authors: Tags: Arch Microbiol Source Type: research
This article is protected by copyright. All rights reserved. PMID: 31703147 [PubMed - as supplied by publisher]
Source: Biotechnology Journal - Category: Biotechnology Authors: Tags: Biotechnol J Source Type: research
This study demonstrated for the first time that copper might induce the susceptibility of fish larvae to inflammatory stimuli via triggering macrophage or neutrophil apoptosis, leading to reduced phagocytic activities and non-sustainable immune responses in immune macrophages or neutrophils.
Source: Frontiers in Immunology - Category: Allergy & Immunology Source Type: research
Publication date: Available online 7 November 2019Source: Fish &Shellfish ImmunologyAuthor(s): Limin Wu, Yongjing Li, Yufeng Xu, Lei Wang, Xiao Ma, Chuanju Dong, Xianliang Zhao, Xue Tian, Xuejun Li, Xianghui KongAbstractMyostatin, through type I receptor (kinase 4, 5, ALK4/5), functions to participate in the immune system and negatively regulate muscle growth in mammals. However, the role of myostatin (mstn) in the immune system of teleosts is largely unknown. In a previous study, we cloned the mstn1 cDNA encoding myostatin in Qi river crucian carp (Carassius auratus). In the present study, we have cloned mstn2 cDNA, w...
Source: Fish and Shellfish Immunology - Category: Biology Source Type: research
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