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Aeromonas hydrophila

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https://www.readbyqxmd.com/read/28917486/effects-of-the-potential-probiotics-bacillus-aerophilus-kadr3-in-inducing-immunity-and-disease-resistance-in-labeo-rohita
#1
Dharmaraj Ramesh, Sami Souissi, Tharifkhan Shan Ahamed
The aim of the present study was to evaluate the dietary administration of Bacillus aerophilus KADR3 on enhancing the immunity and disease resistance against Aeromonas hydrophila infection in Labeo rohita. B. aerophilus culture supernatant exhibited antagonistic activity against fish pathogenic bacteria in an agar well diffusion assay. Four fish groups were fed with either of following diets containing different concentrations of B. aerophilus KADR3 (cfu g(-1)): 0 (control), 1 × 10(7) (DI), 1 × 10(8) (DII), and 1 × 10(9) (DIII) -cfu g(-1)...
September 13, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28916356/molecular-characterization-of-polymeric-immunoglobulin-receptor-and-expression-response-to-aeromonas-hydrophila-challenge-in-carassius-auratus
#2
Li Wang, Jie Zhang, Xianghui Kong, Chao Pei, Xianliang Zhao, Li Li
The polymeric immunoglobulin receptor (pIgR) plays a pivotal role in mucosal immune response by transporting polymeric immunoglobulins onto the surface of mucosal epithelia to protect animals from invading pathogens. In this study, the full-length cDNA of pIgR was firstly cloned in Qihe crucian carp (Carassius auratus), hereafter designated as CapIgR, by using reverse transcription polymerase chain reaction and rapid amplification of cDNA ends. The molecular characterization and expression of CapIgR were investigated...
September 12, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28899777/jerusalem-artichoke-enriched-diet-on-growth-performance-immuno-hematological-changes-and-disease-resistance-against-aeromonas-hydrophila-in-asian-seabass-lates-calcarifer
#3
Sajjad Syed Raffic Ali, Kondusamy Ambasankar, Mohamed Saiyad Musthafa, Ramasamy Harikrishnan
A 45 days feeding trial was conducted to study the effect of Jerusalem artichoke (JA) on growth performance, body composition, biochemical, immuno-hematological parameters and disease resistance in Asian seabass (Lates calcarifer) fingerlings against Aeromonas hydrophila. JA was supplemented at three different levels viz., control 0, 5, 10, and 20 g kg(-1) in the commercial diet (403 g kg(-1)protein and 89 g kg (-1)lipid) in L. calcarifer. The results showed that there were no significant (P > 0...
September 9, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28888727/genome-wide-characterization-of-toll-like-receptor-gene-family-in-common-carp-cyprinus-carpio-and-their-involvement-in-host-immune-response-to-aeromonas-hydrophila-infection
#4
Yiwen Gong, Shuaisheng Feng, Shangqi Li, Yan Zhang, Zixia Zhao, Mou Hu, Peng Xu, Yanliang Jiang
The Toll-like receptor (TLR) gene family is a class of conserved pattern recognition receptors, which play an essential role in innate immunity providing efficient defense against invading microbial pathogens. Although TLRs have been extensively characterized in both invertebrates and vertebrates, a comprehensive analysis of TLRs in common carp is lacking. In the present study, we have conducted the first genome-wide systematic analysis of common carp (Cyprinus carpio) TLR genes. A set of 27 common carp TLR genes were identified and characterized...
September 1, 2017: Comparative Biochemistry and Physiology. Part D, Genomics & Proteomics
https://www.readbyqxmd.com/read/28888536/in%C3%A2-vitro-immunostimulatory-potential-of-fungal-%C3%AE-glucans-in-pacific-red-snapper-lutjanus-peru-cells
#5
Tomás Cárdenas-Reyna, Carlos Angulo, Crystal Guluarte, Sawako Hori-Oshima, Martha Reyes-Becerril
This study attempts to describe the immunostimulatory effects of three fungal glucans on innate immunity responses in an in vitro assays using Pacific red snapper leukocytes. First, the yield glucans obtained was higher in Aspergillus niger, follow by Aspergillus ochraceus and Alternaria botrytis (40, 20 and 10%, respectively). Structural characterization of these fungal glucans by proton nuclear magnetic resonance (NMR) indicated structures containing (1-6)-branched (1-3)-β-D-glucan. The immunostimulatory activity of fungal glucans were assessed in head-kidney leukocytes at 24 h using colorimetric assays and molecular gene expression...
September 6, 2017: Developmental and Comparative Immunology
https://www.readbyqxmd.com/read/28882803/involvement-of-the-macrobrachium-nipponense-rhodanese-homologue-2-mnrdh2-in-innate-immunity-and-antioxidant-defense
#6
Ting Tang, Congcong Ji, Zilan Yang, Fengsong Liu, Song Xie
In Macrobrachium nipponense, the rhodanese homologue 2 (MnRDH2) gene codes for a single rhodanese domain protein. Considering the lack of information on the biological role of the ubiquitous rhodaneses in invertebrate, we examined the functions of MnRDH2 using both in silico and in vitro approaches. Quantitative PCR analysis of different tissues indicated that expression of MnRDH2 was enriched in hepatopancreas, in which bacterial challenge by Aeromonas hydrophila induced MnRDH2 expression. Knocking down MnRDH2 by RNA interference caused significant accumulations of reactive oxygen species and malondialdehyde (MDA)...
September 4, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28877365/molecular-cloning-characterization-and-expression-of-immunoglobulin-d-igd-on-pathogen-challenge-and-pamps-stimulation-in-freshwater-carp-catla-catla
#7
Rajanya Banerjee, Bhakti Patel, Madhubanti Basu, Saswati S Lenka, Mahismita Paicha, Mrinal Samanta, Surajit Das
The primordial immunoglobulin class, IgD is the first non-IgM isotype discovered in teleosts. The crucial role of IgM and IgZ in imparting systemic and mucosal immunity respectively has been widely established in various fish species. However, the putative function of unique IgD isotype during pathogenic invasions has not been explored much. The present study reports the existence of IgD ortholog in freshwater carp, Catla catla and further evaluates its differential expression profile in response to bacterial, parasitic, viral antigenic exposure and (pathogen associated molecular patterns) PAMPs stimulations...
September 6, 2017: Microbiology and Immunology
https://www.readbyqxmd.com/read/28866274/biological-parameters-immune-enzymes-and-histological-alterations-in-the-livers-of-grass-carp-infected-with-aeromonas-hydrophila
#8
Shen-Tong Wang, Xin-Zhan Meng, Li-Sen Li, Yun-Fei Dang, Yuan Fang, Yubang Shen, Xiao-Yan Xu, Rong-Quan Wang, Jia-Le Li
Aeromonas hydrophila is the causative agent of bacterial septicemia that is frequently observed in grass carp, Ctenopharyngodon idellus. In this study, we evaluated the biological parameters and immune enzymes in the liver of grass carp following A. hydrophila infection and quantified the alterations in liver histology using a semi-quantitative system. For the biological parameters, we found that the liver somatic index (LSI) was more sensitive than Fulton's condition factor (CF) and was significantly decreased at three days post-injection (DPI)...
August 31, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28862845/structural-and-functional-analyses-of-periplasmic-5-methylthioadenosine-s-adenosylhomocysteine-nucleosidase-from-aeromonas-hydrophila
#9
Yongbin Xu, Lulu Wang, Jinli Chen, Jing Zhao, Shengdi Fan, Yuesheng Dong, Nam-Chul Ha, Chunshan Quan
The gram-negative, rod-shaped bacterium Aeromonas hydrophila has two multifunctional 5'-methylthioadenosine/S-adenosylhomocysteine nucleosidase (MTAN) enzymes, MtaN-1 and MtaN-2, that differ from those in other bacteria. These proteins are essential for several metabolic pathways, including biological methylation, polyamine biosynthesis, methionine recycling and bacterial quorum sensing. To gain insight into how these two proteins function, we determined four high-resolution crystal structures of MtaN-1 in its apo form and in complex with the substrates S-adenosyl-L-homocysteine (SAH), 5'-methylthioadenosine (MTA), and 5'-deoxyadenosine (5'-DAO)...
September 1, 2017: Biochemistry
https://www.readbyqxmd.com/read/28861049/characterization-of-histopathological-and-ultrastructural-changes-in-channel-catfish-experimentally-infected-with-virulent-aeromonas-hydrophila
#10
Hossam Abdelhamed, Iman Ibrahim, Wes Baumgartner, Mark L Lawrence, Attila Karsi
A highly virulent clonal population of Aeromonas hydrophila (vAh) has been the cause of recent motile Aeromonas septicemia epizootic in channel catfish (Ictalurus punctatus) farms in the Southeastern United States. The pathology of the disease caused by vAh has not been studied well yet. Thus, our aim was to determine histopathological and ultrastructural changes in channel catfish following vAh challenge. To accomplish this, catfish fingerlings were challenged with vAh (strain ML09-119) by bath. Six fish per each time point were collected at 1, 3, 5, 6, 24, and 48 h for light microscopy, and six fish were collected at 48 h for transmission electron microscopy (TEM)...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28859446/oxa-427-a-new-plasmid-borne-carbapenem-hydrolysing-class-d-%C3%AE-lactamase-in-enterobacteriaceae
#11
Pierre Bogaerts, Thierry Naas, Veroniek Saegeman, Remy A Bonnin, Annette Schuermans, Stéphanie Evrard, Warda Bouchahrouf, Thomas Jove, Didier Tande, Xavier de Bolle, Te-Din Huang, Laurent Dortet, Youri Glupczynski
Objectives: To describe a novel plasmid-borne class D carbapenemase (CHDL) named OXA-427 identified in several Enterobacteriaceae clinical isolates from nine patients in one Belgian hospital. Methods: OXA-427-producing isolates were analysed by an electrochemical imipenem hydrolysis method (BYG Carba test), Carba NP test, conventional phenotypic assays and by molecular methods (PCR, whole sequencing of the OXA-427-encoding plasmid and cloning). The antimicrobial resistance profile of OXA-427 was analysed by expression of the cloned gene in Escherichia coli DH10B and J53...
September 1, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28851534/growth-blood-health-antioxidant-status-immune-response-and-resistance-to-aeromonas-hydrophila-of-juvenile-yellow-catfish-exposed-to-di-2-ethylhexyl-phthalate-dehp
#12
Lixia Yuan, Ming Li, Fanxing Meng, Yifu Gong, Yunxia Qian, Ge Shi, Rixin Wang
Triplicate groups of juvenile yellow catfish Pelteobagrus fulvidraco were exposed to three levels of DEHP (0, 0.1 and 0.5mgL(-1)) for 56days. Fish survival (100%) was not affected by different levels of ambient DEHP. Final body weight, weight gain, specific growth rate and feed intake of fish exposed to 0.5mgL(-1) DEHP were the highest. On the contrary, hepatosomatic index of fish exposed to 0.1 and 0.5mgL(-1) DEHP were the lowest. Serum total protein, glutamic-pyruvic transaminase, glutamic-oxaloacetic transaminase, glucose and triglycerides increased with the increasing concentrations of DEHP exposure...
August 26, 2017: Comparative Biochemistry and Physiology. Toxicology & Pharmacology: CBP
https://www.readbyqxmd.com/read/28842846/previously-undescribed-antibacterial-polyketides-from-heterotrophic-bacillus-amyloliquefaciens-associated-with-seaweed-padina-gymnospora
#13
Kajal Chakraborty, Bini Thilakan, Vamshi Krishna Raola
A heterotrophic marine bacterium Bacillus amyloliquefaciens isolated from seaweed Padina gymnospora exhibited broad spectra of antibacterial activities against pathogenic bacteria Aeromonas hydrophila, Vibrio harveyi, Vibrio vulnificus, and Vibrio parahaemolyticus. The seaweed-associated B. amyloliquefaciens was recognized to possess functional type I polyketide synthase-1 (pks-1) gene, and was used to isolate four homologous compounds with polyketide frameworks. The compounds were characterized as 11-(15-butyl-13-ethyl-tetrahydro-12-oxo-2H-pyran-13-yl) propyl-2-methylbenzoate (1), 9-(tetrahydro-12-isopropyl-11-oxofuran-10-yl)-ethyl-4-ethoxy-2-hydroxybenzoate (2), 12-(aminomethyl)-11-hydroxyhexanyl-10-phenylpropanoate (3), and 7-(14-hydroxypropan-13-yl)-8-isobutyl-7,8-dihydrobenzo[c]oxepin-1(3H)-one (4) by comprehensive nuclear magnetic resonance and mass spectroscopic experiments...
August 25, 2017: Applied Biochemistry and Biotechnology
https://www.readbyqxmd.com/read/28840964/modelling-of-microbial-polyhydroxyalkanoate-surface-binding-protein-phap-for-rational-mutagenesis
#14
Hongyu Zhao, Zhenyu Yao, Xiangbin Chen, Xinquan Wang, Guo-Qiang Chen
Phasins are unusual amphiphilic proteins that bind to microbial polyhydroxyalkanoate (PHA) granules in nature and show great potential for various applications in biotechnology and medicine. Despite their remarkable diversity, only the crystal structure of PhaPAh from Aeromonas hydrophila has been solved to date. Based on the structure of PhaPAh , homology models of PhaPAz from Azotobacter sp. FA-8 and PhaPTD from Halomonas bluephagenesis TD were successfully established, allowing rational mutagenesis to be conducted to enhance the stability and surfactant properties of these proteins...
August 25, 2017: Microbial Biotechnology
https://www.readbyqxmd.com/read/28834771/fe-ii-cu-ii-interaction-on-goethite-stimulated-by-an-iron-reducing-bacteria-aeromonas-hydrophila-hs01-under-anaerobic-conditions
#15
Liang Tao, Zhen-Ke Zhu, Fang-Bai Li, Shan-Li Wang
Copper is a trace element essential for living creatures, but copper content in soil should be controlled, as it is toxic. The physical-chemical-biological features of Cu in soil have a significant correlation with the Fe(II)/Cu(II) interaction in soil. Of significant interest to the current study is the effect of Fe(II)/Cu(II) interaction conducted on goethite under anaerobic conditions stimulated by HS01 (a dissimilatory iron reduction (DIR) microbial). The following four treatments were designed: HS01 with α-FeOOH and Cu(II) (T1), HS01 with α-FeOOH (T2), HS01 with Cu(II) (T3), and α-FeOOH with Cu(II) (T4)...
August 16, 2017: Chemosphere
https://www.readbyqxmd.com/read/28831226/antibiotic-and-heavy-metal-resistance-of-aeromonas-hydrophila-and-edwardsiella-tarda-isolated-from-red-hybrid-tilapia-oreochromis-spp-coinfected-with-motile-aeromonas-septicemia-and-edwardsiellosis
#16
S W Lee, W Wendy
AIM: The aim of this study is to identify antibiogram and heavy metal resistance pattern of Aeromonas hydrophila and Edwardsiella tarda isolated from red hybrid tilapia (Oreochromis spp.) coinfected with motile aeromonas septicemia and edwardsiellosis in four commercial fish farms. MATERIALS AND METHODS: A. hydrophila and E. tarda were isolated using glutamate starch phenol red and xylose lysine deoxycholate (Merck, Germany) as a selective medium, respectively. All the suspected bacterial colonies were identified using conventional biochemical tests and commercial identification kit (BBL Crystal, USA)...
July 2017: Veterinary World
https://www.readbyqxmd.com/read/28821241/genetic-diversity-and-virulence-potential-of-clinical-and-environmental-aeromonas-spp-isolates-from-a-diarrhea-outbreak
#17
Lívia Christina Alves da Silva, Tereza Cristina Leal-Balbino, Beatriz Souza Toscano de Melo, Carina Lucena Mendes-Marques, Antonio Mauro Rezende, Alzira Maria Paiva de Almeida, Nilma Cintra Leal
BACKGROUND: Aeromonas spp. are gram-negative bacteria that can cause a variety of infections in both humans and animals and play a controversial role in diarrhea outbreaks. Our aim was to identify clinical and environmental Aeromonas isolates associated with a cholera outbreak in a northeast county of Brazil at the species level. We also aimed to determine the genetic structure of the bacterial population and the virulence potential of the Aeromonas isolates. METHODS AND RESULTS: Analysis based on concatenated sequences of the 16S rRNA and gyrB genes suggested the classification of the 119 isolates studied into the following species: A...
August 18, 2017: BMC Microbiology
https://www.readbyqxmd.com/read/28820083/threonine-deficiency-decreased-intestinal-immunity-and-aggravated-inflammation-associated-with-nf-%C3%AE%C2%BAb-and-target-of-rapamycin-signalling-pathways-in-juvenile-grass-carp-ctenopharyngodon-idella-after-infection-with-aeromonas-hydrophila
#18
Yu-Wen Dong, Wei-Dan Jiang, Yang Liu, Pei Wu, Jun Jiang, Sheng-Yao Kuang, Ling Tang, Wu-Neng Tang, Yong-An Zhang, Xiao-Qiu Zhou, Lin Feng
This study aimed to investigate the impacts of dietary threonine on intestinal immunity and inflammation in juvenile grass carp. Six iso-nitrogenous semi-purified diets containing graded levels of threonine (3·99-21·66 g threonine/kg) were formulated and fed to fishes for 8 weeks, and then challenged with Aeromonas hydrophila for 14 d. Results showed that, compared with optimum threonine supplementation, threonine deficiency (1) decreased the ability of fish against enteritis, intestinal lysozyme activities (except in the distal intestine), acid phosphatase activities, complement 3 (C3) and C4 contents and IgM contents (except in the proximal intestine (PI)), and it down-regulated the transcript abundances of liver-expressed antimicrobial peptide (LEAP)-2A, LEAP-2B, hepcidin, IgZ, IgM and β-defensin1 (except in the PI) (P<0·05); (2) could up-regulate intestinal pro-inflammatory cytokines TNF-α, IL-1β, IL-6, IL-8 and IL-17D mRNA levels partly related to NF-κB signalling; (3) could down-regulate intestinal anti-inflammatory cytokine transforming growth factor (TGF)-β1, TGF-β2, IL-4/13A (not IL-4/13B) and IL-10 mRNA levels partly by target of rapamycin signalling...
July 2017: British Journal of Nutrition
https://www.readbyqxmd.com/read/28819794/in-vitro-selection-and-identification-of-potential-probiotics-isolated-from-the-gastrointestinal-tract-of-nile-tilapia-oreochromis-niloticus
#19
Rasha M Reda, Khaled M Selim, Hassanin M El-Sayed, M A El-Hady
Fish gut bacteria can be used as probiotics for aquaculture. The aim of this study is to screen and identify beneficial probiotic bacteria from the gut of Nile tilapia, Oreochromis niloticus. Nine out of one hundred thirty-five isolates were non-pathogenic through intraperitoneal injection and had antibacterial activities with at least a strain from the five isolated fish pathogens, Aeromonas sobria, Aeromonas hydrophila, Pseudomonas aeruginosa, Pseudomonas putida, and Staphylococcus aureus. Further tests showed that such isolates can survive in the presence of high bile concentration (10%) and at different acidic pH values...
August 17, 2017: Probiotics and Antimicrobial Proteins
https://www.readbyqxmd.com/read/28783490/chronic-endosulfan-exposure-impairs-immune-response-rendering-clarias-gariepinus-susceptible-to-microbial-infection
#20
Usha Kumari, Rashmi Singh, Shibnath Mazumder
Endosulfan, a persistent organochlorine insecticide affects several off-target organisms including fish though the underlying mechanisms remain obscure. In the present study, we monitored the effect of chronic endosulfan exposure on headkidney (HK), an important immune organ in fish and on fish immune system thereof. Clarias gariepinus were exposed to a non-lethal concentration of endosulfan 2.884ppb (1/10th LC50) for 30 d which resulted in suppressed phagocytosis and bactericidal potential of headkidney macrophages (HKM)...
July 31, 2017: Aquatic Toxicology
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