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Aeromonas hydrophila

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https://www.readbyqxmd.com/read/28733908/assessment-of-cultivable-oral-bacterial-flora-from-important-venomous-snakes-of-india-and-their-antibiotic-susceptibilities
#1
Innus K Shaikh, Prashant P Dixit, Balasaheb S Pawade, Mugdha Potnis-Lele, Babasaheb P Kurhe
Snakebite is a common, frequently devastating, occupational, socio-economic hazard, and it has a great impact on the rural population of India. Snakebite is a major cause of the human morbidity and mortality since ancient times, as it not only affects the victim by systemic envenomation but also by wound infections originating from deadly pathogenic microorganisms from the oral cavity of the offending snake. The pathogens from the oral cavity of the snake tend to initiate an infection, resulting in gas gangrene, soft tissue necrosis, and permanent physical disabilities...
July 21, 2017: Current Microbiology
https://www.readbyqxmd.com/read/28733150/seven-new-lignan-glycosides-from-the-branches-of-alangium-kurzii-craib-var-laxifolium
#2
Jie Ren, Yang-Guo Xie, Ying-Ying Huang, Sheng-Lan Zhu, Shi-Kai Yan, Hui-Zi Jin, Wei-Dong Zhang
Seven new lignan glycosides (1-3, 8-10, and 14) and 17 known compounds were isolated from the branches of Alangium kurzii Craib var. laxifolium. Their structures were established by spectroscopic analysis and circular dichroism (CD) and X-ray analysis. The isolated compounds were evaluated for their antibacterial activities against Staphylococcus aureus CI1011, Streptococcus suis CI1608, Salmonella gallinarum CI0912, Enterococcus faecalis CI1304, Aeromonas hydrophila CI1008, Escherichia coli CI151012, Vibrio parahaemolyticus CI150506, Klebsiella pneumoniae CI131216, Pseudomonas aeruginosa CI1011, Staphylococcus epidermidis CI1110, and Streptococcus agalactiae CI1302...
July 18, 2017: Fitoterapia
https://www.readbyqxmd.com/read/28713788/microorganisms-of-the-intestinal-microbiota-of-oncorhynchus-mykiss-produce-antagonistic-substances-against-bacteria-contaminating-food-and-causing-disease-in-humans
#3
Olga Lobos, Andrea Barrera, Carlos Padilla
The objective was to analyse the antibacterial ability of members of the intestinal microbiota of Oncorhynchus mykiss specimens on several bacterial target strains that contaminate food and cause disease in humans. Bacterial colonies from an intestinal portion of the 20 specimens of O. mykiss were obtained in different culture media. Several of the colonies showed antibacterial action on different target strains. The bacterial species with the highest antagonistic capacity were Hafnia alvei and Lactococcus lactis and the more susceptible target strains were Aeromonas hydrophila, Listeria monocytogenes and Escherichia coli...
April 13, 2017: Italian Journal of Food Safety
https://www.readbyqxmd.com/read/28713009/aeromonas-hydrophila-induced-alterations-in-cytosolic-calcium-activate-pro-apoptotic-cpkc-mek1-2-tnf%C3%AE-axis-in-infected-headkidney-macrophages-of-clarias-gariepinus
#4
Asha Shelly, Chaitali Banerjee, Gunjan Kumar Saurav, Atish Ray, Vipin Singh Rana, Rajagopal Raman, Shibnath Mazumder
Alterations in intracellular-calcium (Ca(2+))i homeostasis is critical to Aeromonas hydrophila-induced headkidney macrophages (HKM) apoptosis of Clarias gariepinus, though the implications are poorly understood. Here, we describe the role of intermediate molecules of Ca(2+-)signaling pathway that are involved in HKM apoptosis. We observed phosphoinositide-3-kinase/phospholipase C is critical for (Ca(2+))i release in infected HKM. Heightened protein kinase-C (PKC) activity and phosphorylation of MEK1/2-ERK1/2 was noted which declined in presence of 2-APB, Go6976 and PD98059, inhibitors to IP3-receptor, conventional PKC isoforms (cPKC) and MEK1/2 respectively implicating Ca(2+)/cPKC/MEK-ERK1/2 axis imperative in A...
July 14, 2017: Developmental and Comparative Immunology
https://www.readbyqxmd.com/read/28708867/transcriptome-differences-between-enrofloxacin-resistant-and-enrofloxacin-susceptible-strains-of-aeromonas-hydrophila
#5
Fengjiao Zhu, Zongying Yang, Yiliu Zhang, Kun Hu, Wenhong Fang
Enrofloxacin is the most commonly used antibiotic to control diseases in aquatic animals caused by A. hydrophila. This study conducted de novo transcriptome sequencing and compared the global transcriptomes of enrofloxacin-resistant and enrofloxacin-susceptible strains. We got a total of 4,714 unigenes were assembled. Of these, 4,122 were annotated. A total of 3,280 unigenes were assigned to GO, 3,388 unigenes were classified into Cluster of Orthologous Groups of proteins (COG) using BLAST and BLAST2GO software, and 2,568 were mapped onto pathways using the Kyoto Encyclopedia of Gene and Genomes Pathway database...
2017: PloS One
https://www.readbyqxmd.com/read/28704687/antimicrobial-polyketide-furanoterpenoids-from-seaweed-associated-heterotrophic-bacterium-bacillus-subtilis-mtcc-10403
#6
Kajal Chakraborty, Bini Thilakan, Vamshi Krishna Raola
Brown seaweed Anthophycus longifolius (Turner) Kützing (family Sargassaceae) associated heterotrophic bacterium Bacillus subtilis MTCC 10403 was found to be a potent isolate with broad range of antibacterial activity against important perceptive food pathogens Vibrio parahaemolyticus, V. vulnificus, and Aeromonas hydrophila. This bacterium was positive for polyketide synthetase gene (KC589397), and therefore, was selected to bioprospect specialized metabolites bearing polyketide backbone. Bioactivity-guided chromatographic fractionation of the ethyl acetate extract of the seaweed-associated bacterium segregated four homologous polyketide furanoterpenoids with potential antibacterial activities against clinically important pathogens...
July 10, 2017: Phytochemistry
https://www.readbyqxmd.com/read/28698127/dietary-protein-levels-regulated-antibacterial-activity-inflammatory-response-and-structural-integrity-in-the-head-kidney-spleen-and-skin-of-grass-carp-ctenopharyngodon-idella-after-challenged-with-aeromonas-hydrophila
#7
Wei-Dan Jiang, Jing Xu, Xiao-Qiu Zhou, Pei Wu, Yang Liu, Jun Jiang, Sheng-Yao Kuang, Ling Tang, Wu-Neng Tang, Yong-An Zhang, Lin Feng
This study investigated the effects of dietary protein levels on disease resistance, immune function and structural integrity in the head kidney, spleen and skin of grass carp (Ctenopharyngodon idella). A total of 540 grass carp (264.11 ± 0.76 g) were fed six diets containing graded levels of protein (143.1, 176.7, 217.2, 257.5, 292.2 and 322.8 g digestible protein kg(-1) diet) for 8 weeks. After the growth trial, fish were challenged with Aeromonas hydrophila for 14 days. The results indicated that optimal levels of dietary protein: (1) (1) increased the lysozyme (LA) and acid phosphatase (ACP) activities and the complement 3 (C3) and C4 contents, up-regulated antimicrobial peptides, anti-inflammatory cytokines, inhibitor of κBα, target of rapamycin and ribosomal protein S6 kinases 1 mRNA levels, whereas down-regulated pro-inflammatory cytokines, nuclear factor kappa B (NF-κB) P65, IKKβ, IKKγ, eIF4E-binding proteins (4E-BP) 1 and 4E-BP2 mRNA levels in the head kidney, spleen and skin of grass carp (P < 0...
July 8, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28698125/effects-of-lactobacillus-delbrueckii-on-immune-response-disease-resistance-against-aeromonas-hydrophila-antioxidant-capability-and-growth-performance-of-cyprinus-carpio-huanghe-var
#8
Chun-Nuan Zhang, Ji-Liang Zhang, Wen-Chao Guan, Xiao-Fei Zhang, Su-Hua Guan, Qing-Hui Zeng, Gao-Feng Cheng, Wei Cui
The aim of the present study was to investigate effects of dietary Lactobacillus delbrueckii (L. delbrueckii) on immune response, disease resistance against Aeromonas hydrophila (A. hydrophila), antioxidant capability and growth performance of Cyprinus carpio Huanghe var. 450 fish (mean weight of 1.05 ± 0.03 g) were randomly distributed into five groups that fed diets containing different levels of L. delbrueckii (0, 1 × 10(5), 1 × 10(6), 1 × 10(7) and 1 × 10(8) CFU g(-1)) for 8 weeks. The results showed that intestinal immune parameters such as lysozyme, acid phosphatase, and myeloperoxidase activities, immunoglobulin M content, and the survival rate were improved in fish fed with 1 × 10(6) and 1 × 10(7) CFU g(-1)L...
July 8, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28689359/immunotoxic-responses-of-chronic-exposure-to-cypermethrin-in-common-carp
#9
Siyavash Soltanian, Mohammad Saeed Fereidouni
In the current study, laboratory evaluations were made to assess the immunomodulatory effect of cypermethrin on fingerlings of common carp (Cyprinus carpio L.). Results showed that 96-h LC50 of cypermethrin in common carp was estimated at 0.85 μg/L. Fish were exposed for 21 days to cypermethrin at three sub-lethal concentrations of 0.042, 0.085, and 0.17 μg/L that represented 5, 10, and 20%, respectively, of the 96-h LC50 of the pesticide for this fish species. Blood samples were taken after 7, 14, and 21 days of exposure...
July 8, 2017: Fish Physiology and Biochemistry
https://www.readbyqxmd.com/read/28688911/evaluation-of-dietary-hybanthus-enneaspermus-linn-f-muell-as-a-growth-and-haemato-immunological-modulator-in-labeo-rohita
#10
Sib Sankar Giri, Venkatachalam Sukumaran, Jun Woo Jun, Se Chang Park
This study evaluated the effects of Hybanthus enneaspermus aqueous extract (HEE) as a feed supplement on growth, immune responses, haematological, and biochemical parameters of Labeo rohita and its susceptibility to Aeromonas hydrophila infection. Diets containing five variable concentrations of HEE (g kg(-1)) (0 [basal diet], 1.0 [H1], 2.0 [H2], 3.0 [H3], and 4.0 [H4]) were fed to fish (average weight: 17.2 ± 0.21 g) for 6 weeks. Growth parameters, immune parameters, and haemato-biochemical parameters were examined 6 weeks post-feeding...
July 5, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28685594/disruption-of-the-quorum-sensing-regulated-pathogenic-traits-of-the-biofilm-forming-fish-pathogen-aeromonas-hydrophila-by-tannic-acid-a-potent-quorum-quencher
#11
Bhakti Patel, Supriya Kumari, Rajanya Banerjee, Mrinal Samanta, Surajit Das
The quorum sensing (QS) phenomenon regulates a myriad of pathogenic traits in the biofilm forming fish pathogen, Aeromonas hydrophila. Blocking the QS mechanism of A. hydrophila is a novel strategy to prevent disease in fish. This study evaluated the effect of tannic acid, a QS inhibitor, on A. hydrophila-associated QS regulated phenomena. A streaking assay with Chromobacterium violaceum (CVO26) reported the presence of N-acyl homoserine lactone (AHL) in A. hydrophila, which was confirmed by HPLC and GC-MS analysis...
July 7, 2017: Biofouling
https://www.readbyqxmd.com/read/28676336/quantitative-proteomic-analysis-of-iron-regulated-outer-membrane-proteins-in-aeromonas-hydrophila-as-potential-vaccine-candidates
#12
Yuqian Wang, Huarong Chen, Zhuang Guo, Lina Sun, Yuying Fu, Tao Li, Wenxiong Lin, Xiangmin Lin
The iron-regulated outer membrane protein (OMP) of Aeromonas hydrophila is an effective vaccine candidate, but its intrinsic functional components are largely unknown. In this study, we compared the differentially expressed sarcosine-insoluble fractions of A. hydrophila in iron-limited and normal medium using tandem mass tag labeling-based quantitative proteomics, and identified 91 upregulated proteins including 21 OMPs and 83 downregulated proteins including 10 OMPs. Subsequent bioinformatics analysis showed that iron chelate transport-related proteins were enriched in increasing abundance, whereas oxidoreductase activity and translation-related proteins were significantly enriched in decreasing abundance...
July 1, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28674526/induction-of-cryptic-and-bioactive-metabolites-through-natural-dietary-components-in-an-endophytic-fungus-colletotrichum-gloeosporioides-penz-sacc
#13
Vijay K Sharma, Jitendra Kumar, Dheeraj K Singh, Ashish Mishra, Satish K Verma, Surendra K Gond, Anuj Kumar, Namrata Singh, Ravindra N Kharwar
Grape skin and turmeric extracts having the major components resveratrol and curcumin, respectively, were used for the induction of cryptic and bioactive metabolites in an endophytic fungus Colletotrichum gloeosporioides isolated from Syzygium cumini. The increase in total amount of crude compounds in grape skin and turmeric extract treated cultures was 272.48 and 174.32%, respectively, compared to the untreated control. Among six human pathogenic bacteria tested, the maximum inhibitory activity was found against Aeromonas hydrophila IMS/GN11 while no inhibitory activity was observed against Enterococcus faecalis IMS/GN7...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28663129/molecular-characterization-and-expression-pattern-of-x-box-binding-protein-1-xbp1-in-common-carp-cyprinus-carpio-l-indications-for-a-role-of-xbp1-in-antibacterial-and-antiviral-immunity
#14
Ting Li, Hua Li, Shaoqing Peng, Fumiao Zhang, Liguo An, Guiwen Yang
X box-binding protein-1 (XBP1) is a transcription factor that is essential for the unfolded protein response (UPR) and the differentiation of plasma cells, and some findings have also uncovered its function in innate immunity. XBP1 typically has two different transcripts, un-spliced (XBP1u) and spliced forms (XBP1s), but XBP1s is an active transcription factor in the regulation of target genes. To date, there is no evidence about the identification and function of XBP1 in common carp. Moreover, no data are currently available regarding the role of fish XBP1 in innate immunity...
August 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28658756/unusual-severe-extra-intestinal-manifestations-of-a-common-enteric-pathogen-aeromonas-spp
#15
Barnini Banerjee, Mridula Madiyal, Lingadakai Ramchandra, Chiranjay Mukhopadhyay, Rahul Garg, Kiran Chawla
INTRODUCTION: Aeromonas spp. are halophilic, Gram-negative bacilli. They are widely distributed in the soil and aquatic environment and have been associated with various extra-intestinal infections, such as skin and soft-tissue infections, meningitis, bacteraemia etc. The most common species associated with extra-intestinal infection is Aeromonas hydrophila. AIM: To get the overview of clinical presentations, underlying predisposing factors associated with the extra-intestinal infections caused by Aeromonas species and their antimicrobial susceptibility pattern...
May 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28655927/coordination-of-bactericidal-and-iron-regulatory-functions-of-hepcidin-in-innate-antimicrobial-immunity-in-a-zebrafish-model
#16
Xiao-Feng Jiang, Zhi-Fei Liu, Ai-Fu Lin, Li-Xin Xiang, Jian-Zhong Shao
Hepcidin acts as both an antimicrobial peptide and a hormonal regulator of iron homeostasis; however, the biological significance of this dual-function in immune reactions remains elusive. In this study, we provide experimental evidence regarding the coordination of this dual-function in the innate antimicrobial immunity using a zebrafish model. The transcription of hepcidin gene was significantly upregulated in liver by Aeromonas hydrophila (A.h) DNA stimulation, which was accompanied by an increase of hepcidin protein and a decrease of iron concentration in serum...
June 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28655594/transcriptome-profiling-and-expression-analysis-of-immune-responsive-genes-in-the-liver-of-golden-mahseer-tor-putitora-challenged-with-aeromonas-hydrophila
#17
Rohit Kumar, Prabhati K Sahoo, Ashoktaru Barat
Transcriptome profiling has been used to decipher the novel mechanisms behind immune responses of the fishes. However, the molecular mechanism underlining immune response in mahseer is not studied so far. Fishes are greatly affected by bacterial pathogens such as Aeromonas hydrophila. In this study, transcriptome response of golden mahseer (Tor putitora) infected with A. hydrophila was examined using paired end Illumina sequencing of liver tissue to understand the immune response of the fish. The de novo assembly generated 61,042 unigenes ranging from 200 to 9322 bp in length and an average length of 463 bp...
August 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28652983/modulation-of-the-innate-immune-responses-in-the-striped-snakehead-murrel-channa-striata-upon-experimental-infection-with-live-and-heat-killed-aeromonas-hydrophila
#18
Sekaran Kalaivani Priyadarshini, Parasuraman Aiya Subramani, Rajamani Dinakaran Michael
It is well-known that the innate immune mechanisms in fish serve as the first line of defence against wide variety of pathogens. In most of the situations, innate responses get induced and enhanced after the pathogen invasion. It would be interesting to look into the inducibility of various innate immune mechanisms and the level of enhancement after infection with the pathogen. Hence, in the present investigation, modulation of the innate immune responses in the striped snakehead murrel, Channa striata on experimental challenge with either live virulent or heat killed Aeromonas hydrophila at a dose of 1x10(7) CFU (suspended in 0...
2017: Open veterinary journal
https://www.readbyqxmd.com/read/28648622/a-novel-antimicrobial-therapy-for-the-control-of-aeromonas-hydrophila-infection-in-aquaculture-using-marine-polysaccharide-coated-gold-nanoparticle
#19
Sekar Vijayakumar, Baskaralingam Vaseeharan, Balasubramanian Malaikozhundan, Narayanan Gobi, Samuthirapandian Ravichandran, Sellamuthu Karthi, Balasubramaniem Ashokkumar, Natesan Sivakumar
In the present study, we prepared fucoidan coated Au-NPs (Fu-AuNPs), and examined its antimicrobial activity against Aeromonas hydrophila. The green synthesized Fu-AuNPs were bio-physically characterized by Ultraviolet-visible (UV-Vis) spectroscopy, X-ray Diffraction (XRD), Fourier Transform Infrared spectroscopy (FTIR), Higher Transmission Electron Microscopy (HR-TEM), Zeta potential analysis and Energy Dispersive X-ray spectroscopy (EDX). Fu-AuNPs were crystalline in nature, spherical to triangular in shape, with particle size ranging within 10-100 nm...
June 23, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28647817/molecular-characterization-of-the-cd79a-and-cd79b-and-its-role-against-aeromonas-hydrophila-infection-in-chinese-sucker-myxocyprinus-asiaticus
#20
Huan Li, Yujin Li, Xiaoping Zhang, Yafeng Wang, Wufeng Zhang, Xia Wu, Zhijian Wang
CD79a and CD79b heterodimers are the important signaling components of B cell receptor (BCR) complex which plays a crucial role in B cell development and antibody production. In the present study, CD79a and CD79b homologues from Chinese sucker (Myxocyprinus asiaticus), namely MaCD79a and MaCD79b, were identified and their expression at early developmental stages and under constitutive and stimulated conditions were investigated. The cDNA sequences for MaCD79a and MaCD79b contained open reading frame of 678 and 636 bp in length for 225 and 211 amino acid residues, respectively...
June 25, 2017: Fish Physiology and Biochemistry
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