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https://www.readbyqxmd.com/read/28179508/two-step-enhanced-cancer-immunotherapy-with-engineered-salmonella-typhimurium-secreting-heterologous-flagellin
#1
Jin Hai Zheng, Vu H Nguyen, Sheng-Nan Jiang, Seung-Hwan Park, Wenzhi Tan, Seol Hee Hong, Myung Geun Shin, Ik-Joo Chung, Yeongjin Hong, Hee-Seung Bom, Hyon E Choy, Shee Eun Lee, Joon Haeng Rhee, Jung-Joon Min
We report a method of cancer immunotherapy using an attenuated Salmonella typhimurium strain engineered to secrete Vibrio vulnificus flagellin B (FlaB) in tumor tissues. Engineered FlaB-secreting bacteria effectively suppressed tumor growth and metastasis in mouse models and prolonged survival. By using Toll-like receptor 5 (TLR5)-negative colon cancer cell lines, we provided evidence that the FlaB-mediated tumor suppression upon bacterial colonization is associated with TLR5-mediated host reactions in the tumor microenvironment...
February 8, 2017: Science Translational Medicine
https://www.readbyqxmd.com/read/28150143/iutb-participates-in-the-ferric-vulnibactin-utilization-system-in-vibrio-vulnificus-m2799
#2
Hiroaki Kawano, Katsushiro Miyamoto, Miho Negoro, Eriko Zushi, Takahiro Tsuchiya, Tomotaka Tanabe, Tatsuya Funahashi, Hiroshi Tsujibo
Vibrio vulnificus, an opportunistic pathogen that causes a serious, often fatal, infection in humans, requires iron for its growth. This bacterium utilizes iron from the environment via the vulnibactin-mediated iron uptake system. The mechanisms of vulnibactin biosynthesis, vulnibactin export, and ferric-vulnibactin uptake systems have been reported, whereas the ferric-vulnibactin reduction mechanism in the cell remains unclear. The results of our previous study showed that VuuB, a member of the flavin adenine dinucleotide-containing siderophore-interacting protein family, is a ferric-vulnibactin reductase, but there are other reductases that can complement for the defective vuuB...
February 1, 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/28118133/detection-enumeration-and-isolation-of-vibrio-parahaemolyticus-and-v-vulnificus-from-seafood-development-of-a-multidisciplinary-protocol
#3
Swapan K Banerjee, Jeffrey M Farber
<em>Vibrio parahaemolyticus</em> and <em>V. vulnificus</em> are bacterial foodborne pathogens that can cause illnesses in humans after ingestion or exposure to contaminated seafood or coastal waters. A procedure that combines microbiological, biochemical, and molecular methods was designed and optimized for the detection, enumeration, isolation, and characterization of these clinically significant <em>Vibrio</em> spp. Initially, microbiological culturing is used to resuscitate and isolate presumptive <em>Vibrio</em> spp...
November 10, 2016: Journal of AOAC International
https://www.readbyqxmd.com/read/28111826/regulation-systems-of-protease-and-hemolysin-production-in-vibrio-vulnificus
#4
Abdelaziz Elgaml, Shin-Ichi Miyoshi
Vibrio vulnificus is a gram-negative halophilic estuarine bacterium. It is an opportunistic human pathogen causing rapidly progressive fatal septicemia and necrotizing wound infection. This species also causes hemorrhagic septicemia called vibriosis in cultured eels. A range of virulence factors have been proposed to play a role in pathogenesis of the bacterium during human and/or eel infection. Among these factors, the metalloprotease (V. vulnificus protease: VVP) and the cytolytic toxin (V. vulnificus hemolysin: VVH) are significantly important...
January 23, 2017: Microbiology and Immunology
https://www.readbyqxmd.com/read/28108339/transcriptome-analysis-of-the-effect-of-polyunsaturated-fatty-acids-against-vibrio-vulnificus-infection-in-oreochromis-niloticus
#5
Chieh-Yu Pan, Yu-Hao Liu, Hong-Yi Gong, Jyh-Yih Chen
Vibrio vulnificus infection causes severe economic losses in Oreochromis niloticus aquaculture by inducing pro-inflammatory cytokines, that lead to inflammation and mortality. Omega-3 fatty acids, such as Docosahexaenoic acid (DHA) and Eicosapentaenoic acid (EPA), have been reported for their anti-inflammatory and antibacterial abilities in murine and zebrafish models. However, the anti-inflammatory and antibacterial functions of DHA and EPA in commercial aquaculture organisms such as Oreochromis niloticus remain unknown...
January 17, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28099766/high-salinity-relaying-to-reduce-vibrio-parahaemolyticus-and-vibrio-vulnificus-in-chesapeake-bay-oysters-crassostrea-virginica
#6
Salina Parveen, Michael Jahncke, Sara Elmahdi, Helen Crocker, John Bowers, Chanelle White, Stephanie Gray, Amanda C Morris, Kathy Brohawn
Cases of Vibrio infections in the United States have tripled from 1996 to 2009 and these infections are most often associated with the consumption of seafood, particularly oysters (Crassostrea virginica). Information is needed on how to reduce numbers of Vibrio parahaemolyticus and Vibrio vulnificus in bi-valve molluscan shellfish (for example, oysters). The purpose of this study was to evaluate the effectiveness of high salinity relaying or treatment in recirculating aquaculture systems (RASs) as methods to reduce the abundance of V...
January 18, 2017: Journal of Food Science
https://www.readbyqxmd.com/read/28097594/mechanism-of-anti-vibrio-activity-of-marine-probiotic-strain-bacillus-pumilus-h2-and-characterization-of-the-active-substance
#7
Xi-Yan Gao, Ying Liu, Li-Li Miao, Er-Wei Li, Ting-Ting Hou, Zhi-Pei Liu
Vibriosis is a major epizootic disease that impacts free-living and farmed fish species worldwide. Use of probiotics is a promising approach for prevention of Vibrio infections in aquaculture. A probiotic anti-Vibrio strain, Bacillus pumilus H2, was characterized, and the mechanism of its effect was investigated. All 29 Vibrio strains tested were growth-inhibited by H2. The anti-Vibrio substance present in cell-free supernatant of H2 was purified and characterized by reversed-phase HPLC. Minimum inhibitory concentrations of the purified substance, determined in liquid media for various Vibrio strains, ranged from 0...
December 2017: AMB Express
https://www.readbyqxmd.com/read/28060924/the-effector-domain-region-of-the-vibrio-vulnificus-martx-toxin-confers-biphasic-epithelial-barrier-disruption-and-is-essential-for-systemic-spread-from-the-intestine
#8
Hannah E Gavin, Nike T Beubier, Karla J F Satchell
Vibrio vulnificus causes highly lethal bacterial infections in which the Multifunctional Autoprocessing Repeats-in-Toxins (MARTX) toxin product of the rtxA1 gene is a key virulence factor. MARTX toxins are secreted proteins up to 5208 amino acids in size. Conserved MARTX N- and C-terminal repeat regions work in concert to form pores in eukaryotic cell membranes, through which the toxin's central region of modular effector domains is translocated. Upon inositol hexakisphosphate-induced activation of the of the MARTX cysteine protease domain (CPD) in the eukaryotic cytosol, effector domains are released from the holotoxin by autoproteolytic activity...
January 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28058248/first-multi-year-retrospective-study-on-vibrio-parhaemolyticus-and-vibrio-vulnificus-prevalence-in-ruditapes-philippinarum-harvested-in-sacca-di-goro-italy
#9
Patrizia Serratore, Fabio Ostanello, Pier Luca Passalacqua, Emanuele Zavatta, Giorgia Bignami, Andrea Serraino, Federica Giacometti
The present work describes a retrospective study aiming to verify a possible correlation between the environmental conditions (temperature, salinity and dissolved oxygen), the abundance of Vibrio spp., and the prevalence of V. parahaemolyticus and V. vulnificus in the Manila clam R. philippinarum harvested in Sacca di Goro, Emilia-Romagna Region, Northern Italy. On the whole, 104 samples, collected in the period 2007-2015 and submitted to microbiological analyses (isolation and genotyping), have been reconsidered for Vibrio spp...
September 20, 2016: Italian Journal of Food Safety
https://www.readbyqxmd.com/read/28056111/vibrio-vulnificus-from-oyster-colonist-to-human-pathogen
#10
Kelsey E Phillips, Karla J F Satchell
No abstract text is available yet for this article.
January 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28052529/successful-salvage-and-reconstruction-of-a-finger-threatened-by-vibrio-vulnificus-necrotising-fasciitis-using-fenestrated-type-artificial-dermis-and-three-steps-of-topical-negative-pressure-wound-therapy
#11
Chi-Yu Wang, Hao-Yu Chiao, Chang-Yi Chou, Chien-Ju Wu, Chun-Kai Chang, Tzi-Shiang Chu, Niann-Tzyy Dai
Vibrio vulnificus can cause severe skin and soft tissue infection (SSTI). The pathogen is an opportunistic marine bacterium that is likely to infect patients with chronic liver disease, patients in an immunocompromised state, and those in end-stage renal disease. V. vulnificus gains entry through soft tissues by direct penetration of a wound by infected marine organisms, such as raw oysters, shellfish and other seafood, or by exposing a wound to contaminated water. Despite its ease of entry, V. vulnificus necrotising fasciitis with compartment syndrome has rarely been described...
January 4, 2017: International Wound Journal
https://www.readbyqxmd.com/read/28044234/development-of-a-regulatable-expression-system-for-the-functional-study-of-vibrio-vulnificus-essential-genes
#12
Yan-Jiao Zhang, Guozhong Chen, Huiyuan Lin, Pan Wang, Baozhi Kuang, Jing Liu, Shiyong Chen
We developed a regulatable gene expression system for Vibrio vulnificus, which contains a lacIq-pTrc cassette. Monomeric red fluorescence protein (mRFP) was used as a reporter to test this system. The results showed that this system tightly controlled the expression of mRFP without leaky expression and was suitable for the controlled expression of genes encoding recombinant proteins in V. vulnificus. To demonstrate the utility of this system, a dominant negative form of V. vulnificus VVMO6_RS04990, a homolog of Escherichia coli LolD that is essential in lipoprotein transport and membrane biogenesis, was inducibly expressed...
January 2, 2017: Antonie Van Leeuwenhoek
https://www.readbyqxmd.com/read/28024537/cmc-stabilized-nano-silver-synthesis-characterization-and-its-antibacterial-and-synergistic-effect-with-broad-spectrum-antibiotics
#13
P Prema, S Thangapandiyan, G Immanuel
In the present study silver nanoparticles were synthesized by reduction of AgNO3 using aqueous CMC solution, which acts as both reducing and capping agent. The formation of AgNO3 nanoparticles was observed visually by color change and these nanoparticles were characterized through UV-vis spectroscopy, FTIR, XRD, SEM, EDS and AFM. The FTIR peaks observed to be ranging from 3300 to 605cm(-1). The AFM image clearly showed the surface morphology of well dispersed nanoparticles. SEM image illustrates the nanoparticles with spherical shape...
February 20, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/27987123/environmental-investigation-for-the-presence-of-vibrio-species-following-a-case-of-severe-gastroenteritis-in-a-touristic-island
#14
Assimoula Economopoulou, Dimosthenis Chochlakis, Michael Angelos Almpan, Vassilios Sandalakis, Sofia Maraki, Yannis Tselentis, Anna Psaroulaki
Global changes have caused a worldwide increase in reports of Vibrio-associated diseases with ecosystem-wide impacts on humans and marine animals. In Europe, higher prevalence of human infections followed regional climatic trends with outbreaks occurring during episodes of unusually warm weather. Similar patterns were also observed in Vibrio-associated diseases affecting marine organisms such as fish, bivalves, and corals. Following a possible human case of infection due to V. cholerae in the island of Kos (eastern Aegean, Greece), environmental samples were collected and tested for the presence of Vibrio species...
December 16, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27977897/the-membrane-localization-domains-of-two-distinct-bacterial-toxins-form-a-4-helix-bundle-in-solution
#15
Grant S Hisao, Michael C Brothers, Mengfei Ho, Brenda A Wilson, Chad M Rienstra
Membrane localization domain (MLD) was first proposed for a 4-helix-bundle motif in the crystal structure of the C1 domain of Pasteurella multocida toxin (PMT). This structure motif is also found in the crystal structures of several clostridial glycosylating toxins (TcdA, TcdB, TcsL, and TcnA). The Ras/Rap1-specific endopeptidase (RRSP) module of the multifunctional autoprocessing repeats-in-toxins (MARTX) toxin produced by Vibrio vulnificus has sequence homology to the C1-C2 domains of PMT, including a putative MLD...
December 15, 2016: Protein Science: a Publication of the Protein Society
https://www.readbyqxmd.com/read/27936080/effects-of-pyrogallol-on-growth-and-cytotoxicity-of-wild-type-and-katg-mutant-strains-of-vibrio-vulnificus
#16
Ju Young Lim, Choon-Mee Kim, Joon Haeng Rhee, Young Ran Kim
Vibrio vulnificus is a causative agent of fatal septicemia and necrotic wound infection and the pathogen infection became an important public health problem in many counties. Vibrio vulnificus causes RtxA1 toxin-induced acute cell death. We tried to identify natural products that inhibit the acute cytotoxicity of V. vulnificus using a lactate hydrogenase assay. A polyphenol pyrogallol protected HeLa cells from V. vulnificus-induced cytotoxicity. Pyrogallol also decreased the growth of V. vulnificus; this inhibitory effect was more significant during log phase than stationary phase...
2016: PloS One
https://www.readbyqxmd.com/read/27921342/cross-protection-against-vibrio-cholerae-infection-by-monoclonal-antibodies-against-vibrio-vulnificus-rtxa1-martxvv
#17
Tae Hee Lee, Sun-Shin Cha, Chang-Seop Lee, Joon Haeng Rhee, Hye Ryun Woo, Kyung Min Chung
Gram-negative Vibrio species secrete multifunctional autoprocessing repeats-in-toxin (MARTX) toxins associated with bacterial pathogenesis. Here, the cross-reactivity and cross-protectivity of mAbs against V. vulnificus RtxA1/MARTXVv was evaluated. Passive administration of any of these mAbs (21RA, 24RA, 46RA, 47RA and 50RA) provided strong protection against lethal V. cholerae infection. Interestingly, 24RA and 46RA, which map to the cysteine protease domain of V. cholerae MARTXVc , inhibited CPD autocleavage in vitro; this process is involved in V...
November 2016: Microbiology and Immunology
https://www.readbyqxmd.com/read/27915250/importance-of-fumarate-and-nitrate-reduction-regulatory-protein-for-proliferation-for-intestinal-proliferation-of-vibrio-vulnificus
#18
Takehiro Kado, Takashige Kashimoto, Kohei Yamazaki, Shunji Ueno
The sepsis caused by Vibrio vulnificus is characterized by an average incubation period of 26 hours and a high mortality rate exceeding 50%. The fast growth and dissemination of V. vulnificus in vivo lead to poor clinical outcomes in patients. Therefore, elucidation of the proliferation mechanisms of this organism in vivo may lead to development of an effective therapeutic strategy. In this study, we focused on the low oxygen concentration in the intestinal milieu because of its drastic difference from that in the air...
December 2, 2016: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/27895624/visualizing-evolutionary-relationships-of-multidomain-proteins-an-example-from-receiver-rec-domains-of-sensor-histidine-kinases-in-the-candidatus-maribeggiatoa-str-orange-guaymas-draft-genome
#19
Barbara J MacGregor
For multidomain proteins, evolutionary changes may occur at the domain as well as the whole-protein level. An example is presented here, with suggestions for how such complicated relationships might be visualized. Earlier analysis of the Candidatus Maribeggiatoa str. Orange Guaymas (BOGUAY; Gammaproteobacteria) single-filament draft genome found evidence of gene exchange with the phylogenetically distant Cyanobacteria, particularly for sensory and signal transduction proteins. Because these are modular proteins, known to undergo frequent duplication, domain swapping, and horizontal gene transfer, a single domain was chosen for analysis...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27871750/biogeochemical-and-hydrological-drivers-of-the-dynamics-of-vibrio-species-in-two-patagonian-estuaries
#20
Germán A Kopprio, M Eugenia Streitenberger, Kentaro Okuno, Mónica Baldini, Florencia Biancalana, Anna Fricke, Ana Martínez, Sucharit B Neogi, Boris P Koch, Shinji Yamasaki, Rubén J Lara
The ecology of the most relevant Vibrio species for human health and their relation to water quality and biogeochemistry were studied in two estuaries in Argentinian Patagonia. Vibrio cholerae and Vibrio parahaemolyticus were reported in >29% of cases at the Río Colorado and Río Negro estuaries. Neither the pandemic serogroups of Vibrio cholerae O1, Vibrio cholerae O139 nor the cholera toxin gene were detected in this study. However, several strains of V. cholerae (not O1 or O139) are able to cause human disease or acquire pathogenic genes by horizontal transfer...
February 1, 2017: Science of the Total Environment
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