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Aeromonas hydrophila

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https://www.readbyqxmd.com/read/29775741/replacement-of-fishmeal-by-spirulina-arthrospira-platensis-affects-growth-immune-related-gene-expression-in-gibel-carp-carassius-auratus-gibelio-var-cas-iii-and-its-challenge-against-aeromonas-hydrophila-infection
#1
Shenping Cao, Peiyu Zhang, Tao Zou, Shuzhan Fei, Dong Han, Junyan Jin, Haokun Liu, Yunxia Yang, Xiaoming Zhu, Shouqi Xie
The present study examined the effect of dietary spirulina, Arthrospira platensis on growth performance, blood physiological indices, immune-related gene expressions and resistance of juvenile gibel carp against Aeromonas hydrophila infection. Four isonitrogenous (360 g kg-1 ) and isolipidic (90 g kg-1 ) diets were formulated with containing different levels of spirulina powder of 0 g (SP0, the control diet), 3.38 g (SP3.38), 6.76 g (SP6.76) and 13.52 g (SP13.52) per 100 g diet to replace 0%, 25%, 50% and 100% of fishmeal protein, respectively...
May 15, 2018: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/29775727/isolation-structure-elucidation-and-antibacterial-activity-of-methyl-4-8-dimethylundecanate-from-the-marine-actinobacterium-streptomyces-albogriseolus-ecr64
#2
Durairaj Thirumurugan, Ramasamy Vijayakumar, Chithravel Vadivalagan, Pushparaj Karthika, Md Khurshid Alam Khan
Around 120 actinobacterial colonies were isolated from various regions of marine East coast region of Tamil Nadu, India. Among them, 33 were morphologically distinct and they were preliminarily screened for their antibacterial activity against Pseudomonas fluorescens, Vibrio cholerae, V. parahaemolyticus, V. alginolyticus, and Aeromonas hydrophila by cross-streak plate technique. Among the isolated, the isolate ECR64 exhibited maximum zone of inhibition against fish pathogenic bacteria. The crude bioactive compounds were extracted from the isolate ECR64 using different organic solvents which exhibited maximum antibacterial activity...
May 15, 2018: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29772374/evolution-expression-and-characterisation-of-liver-expressed-antimicrobial-peptide-genes-in-ancient-chondrostean-sturgeons
#3
Shuhuan Zhang, Qiaoqing Xu, Hao Du, Zhitao Qi, Youshen Li, Jun Huang, Jun Di, Qiwei Wei
Liver-expressed antimicrobial peptide 2 (leap-2) is an evolutionarily ancient molecule that acts as the key component in vertebrate innate immunity against invading pathogens. Leap-2 has been identified and characterised in several teleosts, but not yet in chondrosteans. Herein, the complete coding sequences of leap-2b and leap-2c were identified from expressed sequence tags (ESTs) isolated from Dabry's sturgeon (Acipenser dabryanus) and Chinese sturgeon (A. sinensis), designated as adleap-2b, adleap-2c, asleap-2b, and asleap-2c, respectively...
May 14, 2018: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/29763734/antioxidant-enzymes-hematology-and-histology-of-spleen-in-nile-tilapia-fed-supplemented-diet-with-natural-extracts-challenged-with-aeromonas-hydrophila
#4
Geovana Dotta, Jaqueline Inês Alves de Andrade, Patrícia Garcia, Gabriel Fernandes Alves Jesus, José Luiz Pedreira Mouriño, Jacó Joaquim Mattos, Afonso Celso Dias Bainy, Maurício Laterça Martins
This study investigated the effects of dietary supplementation with the extrats of propolis and Aloe barbadensis (aloe) on the antioxydant enzime activity, hematology and histology of the spleen of Nile tilapia challenged with Aeromonas hydrophila. Seventy two juvenile Nile tilapia were divided in four treatments and three replicates and fed extract mixture for 15 days: fish fed supplemented diet with 1% of the mixture of extracts of propolis and aloe (1:1) injected with phosphate-buffered saline (PBS); fish fed suplemented diet with 1% of the mixture of extracts of propolis and aloe (1:1) injected with the A...
May 12, 2018: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/29741243/antibacterial-potential-of-phytochemicals-alone-or-in-combination-with-antimicrobials-against-fish-pathogenic-bacteria
#5
G Bandeira Junior, F J Sutili, L T Gressler, V L Ely, B P Silveira, C Tasca, M Reghelin, L B Matter, A P C Vargas, B Baldisserotto
AIMS: This study investigated the antibacterial activity of five phytochemicals (carvacrol, citral, eugenol, linalool, and thymol) alone or in combination with florfenicol or oxytetracycline against bacteria isolated from silver catfish (Rhamdia quelen). We also analyzed the potential of these compounds to inhibit biofilm formation and hemolysis caused by the bacteria. METHODS AND RESULTS: Bacteria were tested with antimicrobials to calculate the multiple antibiotic resistance (MAR)...
May 9, 2018: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/29738873/effects-of-effluent-from-electoplating-industry-on-the-immune-response-in-the-freshwater-fish-cyprinus-carpio
#6
V J Florence Borgia, A J Thatheyus, A G Murugesan, S Catherine P Alexander, I Geetha
The present study was designed to assess the effect of sublethal concentrations of electoplating industry effluent (EIE) on the non-specific and specific immune responses in the freshwater fish, Cyprinus carpio. Sublethal concentrations of electroplating industry effluent such as 0.004, 0.007, 0.010 and 0.013% were chosen based on the LC50 values. Experimental fish were exposed to these sublethal concentrations of EIE for 28 days. After 7, 14, 21 and 28 days of treatment, non-specific immune response by serum lysozyme activity, myeloperoxidase activity and antiprotease activity and specific immune response by antibody response to Aeromonas hydrophila using bacterial agglutination assay and ELISA were assessed...
May 5, 2018: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/29733690/antibacterial-activity-of-indonesian-red-algae-gracilaria-edulis-against-bacterial-fish-pathogens-and-characterization-of-active-fractions
#7
Noer Kasanah, Windi Amelia, Amirul Mukminin, Triyanto, Alim Isnansetyo
In this study the crude ethyl acetate extracts and fractions from red algae Gracilaria edulis were studied against fish pathogens. G. edulis was extracted with ethyl acetate, fractionated in silica gel coloum chromatography and gradient hexane-ethyl acetate. The extract and fractions were subjected for bioassay guided isolation against fish pathogen Vibrio spp and Aeromonas hydrophila. Bioassays were accomplished by diffusion agar, bioauthography, and 96 well microplates format. Profiling chemical constituent was done by thin layer chromatography and GC-MS...
May 7, 2018: Natural Product Research
https://www.readbyqxmd.com/read/29733023/identification-and-bioactivity-analysis-of-a-newly-identified-defensin-from-the-oyster-magallana-gigas
#8
Yubo Zhang, Pengfei Cui, Yashuo Wang, Shicui Zhang
The relatively conserved sequences of signal peptides and proregions that antimicrobial peptides (AMPs) contain have been successfully used to search for and identify novel AMPs from databases within the same lineages of fish and amphibians and across different animal classes. If such an approach is applicable to invertebrate species such as oyster has not yet been tested so far. In this study, we found a cDNA from the digestive gland of the oyster Magallana gigas, designated Mgdefdg, which contains two exons interspaced by one intron...
August 2018: Developmental and Comparative Immunology
https://www.readbyqxmd.com/read/29724212/molecular-characterization-and-expression-patterns-of-a-non-mammalian-toll-like-receptor-gene-tlr21-in-larvae-ontogeny-of-common-carp-cyprinus-carpio-l-and-upon-immune-stimulation
#9
Hua Li, Ting Li, Yujie Guo, Yujun Li, Yan Zhang, Na Teng, Fumiao Zhang, Guiwen Yang
BACKGROUND: In the host innate immune system, various pattern recognition receptors (PRRs) recognize conserved pathogen-associated molecular patterns (PAMPs) and represent an efficient first line of defense against invading pathogens. Toll-like receptors (TLRs) are a major class of PRRs, which are able to recognize a wide range of PAMPs and play a central role in initiating innate immune responses. TLR21 is one of the non-mammalian TLRs identified in some bird and fish species. RESULTS: In the present study, we reported the cloning and identification of a TLR21 cDNA from the head kidney of common carp (Cyprinus carpio L...
May 3, 2018: BMC Veterinary Research
https://www.readbyqxmd.com/read/29720972/spot-mediated-regulation-and-amino-acid-prototrophy-are-essential-for-pyocyanin-production-during-parasitic-growth-of-pseudomonas-aeruginosa-in-a-co-culture-model-system-with-aeromonas-hydrophila
#10
Nina Jagmann, Bodo Philipp
The opportunistic pathogen Pseudomonas aeruginosa employs its complex quorum sensing (QS) network to regulate the expression of virulence factors such as pyocyanin. Besides cell density, QS in this bacterium is co-regulated by environmental cues. In this study, we employed a previously established co-culture model system to identify metabolic influences that are involved in the regulation of pyocyanin production in P. aeruginosa . In this co-culture consisting of P. aeruginosa and the chitinolytic bacterium Aeromonas hydrophila , parasitic growth of P...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29709593/a-novel-toll-like-receptor-from-mytilus-coruscus-is-induced-in-response-to-stress
#11
Mengshan Xu, Jiong Wu, Delong Ge, Changwen Wu, Changfeng Chi, Zhenming Lv, Zhi Liao, Huihui Liu
Toll-like receptor (TLR) is considered to be an evolutionarily conserved transmembrane protein which promotes the Toll signal pathway to active the expression of transcription factors in the innate immunity of the organism. In this study, a full length of TLR homologue of 2525bp in Mytilus coruscus (named as McTLR-a, GenBank accession no: KY940571) was characterized. Its ORF was 1815 bp with a 5'untranslated region (UTR) of 128 bp and a 3'UTR of 582 bp, encoding 602 amino acid residues with a calculated molecular weight of 70...
April 27, 2018: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/29702236/probiotic-potential-of-bacillus-velezensis-jw-antimicrobial-activity-against-fish-pathogenic-bacteria-and-immune-enhancement-effects-on-carassius-auratus
#12
Yanglei Yi, Zhenhua Zhang, Fan Zhao, Huan Liu, Lijun Yu, Jiwei Zha, Gaoxue Wang
This study evaluated the probiotic potential of B. velezensis JW through experimental and genomic analysis approaches. Strain JW showed antimicrobial activity against a broad range of fish pathogenic bacteria including Aeromonas hydrophila, Aeromonas salmonicida, Lactococcus garvieae, Streptococcus agalactiae, and Vibrio Parahemolyticus. Fish (Carassius auratus) were fed with the diets containing 0 (control), 107 , and 109  cfu/g of B. velezensis JW for 4 weeks. Various immune parameters were examined at 1, 2, 3, and 4 weeks of post-feeding...
April 24, 2018: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/29684613/low-or-excess-levels-of-dietary-cholesterol-impaired-immunity-and-aggravated-inflammation-response-in-young-grass-carp-ctenopharyngodon-idella
#13
Xiao-Zhong Wang, Wei-Dan Jiang, Lin Feng, Pei Wu, Yang Liu, Yun-Yun Zeng, Jun Jiang, Sheng-Yao Kuang, Ling Tang, Wu-Neng Tang, Xiao-Qiu Zhou
The present study explored the effect of cholesterol on the immunity and inflammation response in the immune organs (head kidney, spleen and skin) of young grass carp (Ctenopharyngodon idella) fed graded levels of dietary cholesterol (0.041-1.526%) for 60 days and then infected with Aeromonas hydrophila for 14 days. The results showed that low levels of cholesterol (1) depressed the innate immune components [lysozyme (LZ), acid phosphatase (ACP), complements and antimicrobial peptides] and adaptive immune component [immunoglobulin M (IgM)], (2) up-regulated the mRNA levels of pro-inflammatory cytokines [interleukin 1β (IL-1β), IL-6, IL-8, IL-12p35, IL-12p40, IL-15, IL-17D, tumor necrosis factor α (TNF-α) and interferon γ2 (IFN-γ2)], partly due to the activated nuclear factor kappa B (NF-κB) signalling, and (3) down-regulated the mRNA levels of anti-inflammatory cytokines [IL-4/13B, IL-10, IL-11, transforming growth factor (TGF)-β1 and TGF-β2], partly due to the suppression of target of rapamycin (TOR) signalling in the immune organs of young grass carp...
April 20, 2018: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/29684610/fishmeal-replacement-by-rice-protein-concentrate-with-xylooligosaccharides-supplement-benefits-the-growth-performance-antioxidant-capability-and-immune-responses-against-aeromonas-hydrophila-in-blunt-snout-bream-megalobrama-amblycephala
#14
Kenneth Prudence Abasubong, Wen-Bin Liu, Ding-Dong Zhang, Xiang-Yang Yuan, Si-Lei Xia, Chao Xu, Xiang-Fei Li
This study aimed to investigate the effects of fishmeal (FM) replacement by rice protein concentrate (RPC) with a xylooligosaccharides supplement on the growth performance, antioxidant capability and immune response against Aeromonas hydrophila in blunt snout bream (Megalobrama amblycephala). Fish (46.85 ± 0.34 g) were randomly assigned to one of 6 diets, namely the control diet (containing FM), the RPC diet (FM replaced by RPC) and RPC diet supplemented with 0.5, 1.5, 2.3 and 3% XOS respectively, for 8 weeks...
April 20, 2018: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/29684606/sterigmatomyces-halophilus-%C3%AE-glucan-improves-the-immune-response-and-bacterial-resistance-in-pacific-red-snapper-lutjanus-peru-peripheral-blood-leucocytes-in-vitro-study
#15
Martha Reyes-Becerril, Francisco A Guardiola, Veronica Sanchez, Minerva Maldonado, Carlos Angulo
β-Glucans are naturally occurring polysaccharides that are produced by bacteria, fungi and yeast. They are considered immunostimulants in fish acting on non-specific defense mechanism. Yeast-derived glucans from cell wall (Sterigmatomyces halophilus, β-Gluc/Sh) have been used for this purpose in this study. Therefore, an in vitro assay using peripheral blood leucocytes (PBLs) from Pacific red snapper was performed to evaluate the stimulant effects of β-Gluc/Sh and zymosan A (positive control) for 12 and 24 h and after bacterial challenge with Aeromonas hydrophila at 24 h...
April 20, 2018: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/29680689/chicken-type-lysozyme-functions-in-the-antibacterial-immunity-in-red-swamp-cray%C3%AF-sh-procambarus-clarkii
#16
Tian-Jiang Liao, Jie Gao, Jin-Xing Wang, Xian-Wei Wang
Lysozymes possess antibacterial activities, making them crucial defense proteins in innate immunity. In this study, a chicken-type (c-type) lysozyme (designated PcLyzc) was cloned and characterized from red swamp crayfish Procambarus clarkii. The full-length cDNA had an open reading frame of 435 base pairs encoding a polypeptide of 144 amino acid residues. Multiple alignments and phylogenetic analysis revealed that PcLyzc shared high similarity to the other known invertebrate c-type lysozymes. PcLyzc transcripts were steadily expressed in a wide range of tissues in healthy crayfish, and were prominently up-regulated in the hepatopancreas and gills after Vibrio anguillarum or Aeromonas hydrophila challenge...
April 11, 2018: Developmental and Comparative Immunology
https://www.readbyqxmd.com/read/29678792/effects-of-dietary-arginine-on-antioxidant-status-and-immunity-involved-in-ampk-no-signaling-pathway-in-juvenile-blunt-snout-bream
#17
Hualiang Liang, Ke Ji, Xianping Ge, Mingchun Ren, Bo Liu, Bingwen Xi, Liangkun Pan
The present study assessed the effects of dietary arginine on antioxidant status and immunity involved in AMPK-NO signaling pathway in juvenile blunt snout bream. Fish were fed six practical diets with graded arginine levels ranging from 0.87% to 2.70% for 8 weeks. The results showed that compared with the control group (0.87% dietary arginine level), significantly higher mRNA levels of adenosine monophosphate activated protein kinase (AMPK) and nitric oxide synthetase (NOS), activities of total nitric oxide synthetase (T-NOS) and nitric oxide synthetase (iNOS), and plasma nitric oxide (NO) contents were observed in fish fed with 1...
April 17, 2018: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/29671715/potential-of-double-crested-cormorants-phalacrocorax-auritus-american-white-pelicans-pelecanus-erythrorhynchos-and-wood-storks-mycteria-americana-to-transmit-a-hypervirulent-strain-of-aeromonas-hydrophila-between-channel-catfish-culture-ponds
#18
Fred L Cunningham, Madison M Jubirt, Katie C Hanson-Dorr, Lorelei Ford, Paul Fioranelli, Larry A Hanson
Aeromonas hydrophila is a Gram-negative bacterium ubiquitous to freshwater and brackish aquatic environments that can cause disease in fish, humans, reptiles, and birds. Recent severe outbreaks of disease in commercial channel catfish ( Ictalurus punctatus) aquaculture ponds have been associated with a hypervirulent Aeromonas hydrophila strain (VAH) that is genetically distinct from less virulent strains. The epidemiology of this disease has not been determined. Given that research has shown that Great Egrets ( Ardea alba) can shed viable hypervirulent A...
April 19, 2018: Journal of Wildlife Diseases
https://www.readbyqxmd.com/read/29670590/antimicrobial-potential-of-epiphytic-bacteria-associated-with-seaweeds-of-little-andaman-india
#19
Perumal Karthick, Raju Mohanraju
Seaweeds of the intertidal regions are a rich source of surface associated bacteria and are potential source of antimicrobial molecules. In the present study, 77 epiphytic isolates from eight different algae collected from Little Andaman were enumerated. On testing for their antimicrobial activities against certain pathogens twelve isolates showed positive and six of them showed significant antimicrobial inhibition zone against Shigella boydii type 1, Shigella flexneri type 2a, Shigella dysenteriae type 5, Enterotoxigenic Escherichia coli O115, Enteropathogenic E...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29659855/mobile-colistin-resistance-gene-mcr-5-in-porcine-aeromonas-hydrophila
#20
Shizhen Ma, Chengtao Sun, Anette Hulth, Jiyun Li, Lennart E Nilsson, Yuqing Zhou, Stefan Börjesson, Zhenwang Bi, Zhenqiang Bi, Qiang Sun, Yang Wang
Objectives: To characterize the mobile colistin resistance gene mcr-5 in Aeromonas hydrophila from backyard pigs in rural areas of China. Methods: Pig faecal samples from 194 households were directly tested for the presence of mcr-5 by PCR assay and the phenotypic antimicrobial susceptibility profiles of the mcr-5-positive isolates were determined using the broth dilution method. The genomic location and transferability of mcr-5 were analysed by S1-PFGE with Southern blotting and DNA hybridization, and natural transformation, respectively...
April 11, 2018: Journal of Antimicrobial Chemotherapy
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