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https://www.readbyqxmd.com/read/28745416/a-role-for-host-cell-exocytosis-in-inlb-mediated-internalization-of-listeria-monocytogenes
#1
Hoan Van Ngo, Manmeet Bhalla, Da-Yuan Chen, Keith Ireton
The bacterial surface protein InlB mediates internalization of Listeria monocytogenes into human cells through interaction with the host receptor tyrosine kinase, Met. InlB-mediated entry requires localized polymerization of the host actin cytoskeleton. Apart from actin polymerization, roles for other host processes in Listeria entry are unknown. Here we demonstrate that exocytosis in the human cell promotes InlB-dependent internalization. Using a probe consisting of VAMP3 with an exofacial Green Fluorescent Protein (GFP) tag, focal exocytosis was detected during InlB-mediated entry...
July 26, 2017: Cellular Microbiology
https://www.readbyqxmd.com/read/28745291/biogenic-fabrication-of-cunps-cu-bioconjugates-and-in-vitro-assessment-of-antimicrobial-and-antioxidant-activity
#2
Raksha Pandit, Swapnil Gaikwad, Mahendra Rai
In the present study, the authors synthesised copper nanoparticles (CuNPs) by using extract of Zingiber officinale (ginger) and later the NPs were bioconjugated with nisin, which shows antimicrobial activity against food spoilage microorganisms. CuNPs and its bioconjugate were characterised by ultraviolet-vis spectroscopy, NP tracking analysis, Zetasizer, transmission electron microscopy analysis, X-ray diffraction and Fourier transform infra-red (FTIR) spectroscopy. Zeta potential of CuNPs and its bioconjugate were found to be very stable...
August 2017: IET Nanobiotechnology
https://www.readbyqxmd.com/read/28744277/anti-adhesion-and-anti-biofilm-potential-of-organosilane-nanoparticles-against-foodborne-pathogens
#3
Eleni N Gkana, Agapi I Doulgeraki, Nikos G Chorianopoulos, George-John E Nychas
Nowadays, modification of surfaces by nanoparticulate coatings is a simple process that may have applications in reducing the prevalence of bacterial cells both on medical devices and food processing surfaces. To this direction, biofilm biological cycle of Salmonella Typhimurium, Listeria monocytogenes, Escherichia coli O157:H7, Staphylococcus aureus, and Yersinia enterocolitica on stainless steel and glass surfaces, with or without nanocoating was monitored. To achieve this, four different commercial nanoparticle compounds (two for each surface) based on organo-functionalized silanes were selected...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28742382/occurrence-and-antibiotic-susceptibility-of-listeria-species-and-staphylococcus-aureus-in-cattle-slaughterhouses-of-kerala-south-india
#4
Tanuja K G M Gowda, Latha C, Sunil B, Inge Van Damme
A total of 765 samples were collected from beef carcasses, knives, cutting table surfaces, beef, hands, air, and water from four cattle slaughterhouses of Kerala, South India, to determine the occurrence and antibiotic susceptibility of Listeria species and Staphylococcus aureus. Listeria spp. were isolated from beef carcasses (2.0%), knives (3.7%), cutting table surfaces (1.9%), beef (0.7%), and water (1.3%). The identified species were Listeria monocytogenes (0.1%), Listeria innocua (0.9%), and Listeria ivanovii (0...
July 25, 2017: Foodborne Pathogens and Disease
https://www.readbyqxmd.com/read/28742108/fasting-metabolism-modulates-the-interleukin-12-interleukin-10-cytokine-axis
#5
Johannes J Kovarik, Elisabeth Kernbauer, Markus A Hölzl, Johannes Hofer, Guido A Gualdoni, Klaus G Schmetterer, Fitore Miftari, Yury Sobanov, Anastasia Meshcheryakova, Diana Mechtcheriakova, Nadine Witzeneder, Georg Greiner, Anna Ohradanova-Repic, Petra Waidhofer-Söllner, Marcus D Säemann, Thomas Decker, Gerhard J Zlabinger
A crucial role of cell metabolism in immune cell differentiation and function has been recently established. Growing evidence indicates that metabolic processes impact both, innate and adaptive immunity. Since a down-stream integrator of metabolic alterations, mammalian target of rapamycin (mTOR), is responsible for controlling the balance between pro-inflammatory interleukin (IL)-12 and anti-inflammatory IL-10, we investigated the effect of upstream interference using metabolic modulators on the production of pro- and anti-inflammatory cytokines...
2017: PloS One
https://www.readbyqxmd.com/read/28741151/probiotic-characteristics-of-lactobacillus-curvatus-dn317-a-strain-isolated-from-chicken-ceca
#6
Mohamed Zommiti, Nathalie Connil, Jeannette Ben Hamida, Mounir Ferchichi
The probiotic characteristics of Lactobacillus curvatus DN317, a strain isolated from chicken ceca, were evaluated. This strain was selected for study from the isolated Lactobacillus strains because it has specific anti-microbial activity against Campylobacter jejuni ATCC 33560, Camp. jejuni NCTC 11168, Listeria monocytogenes ATCC 7644, and Bacillus subtilis ATCC 8633. Lact. curvatus DN317 showed an auto-aggregation percentage of 72% and presented the highest co-aggregation with Lact. monocytogenes ATCC 7644 (68%) compared to B...
July 24, 2017: Probiotics and Antimicrobial Proteins
https://www.readbyqxmd.com/read/28739228/listeria-monocytogenes-in-raw-milk-milking-equipment-and-dairy-workers-molecular-characterization-and-antimicrobial-resistance-patterns
#7
Asmaa B M B Tahoun, Rasha M M Abou Elez, Eman N Abdelfatah, Ibrahim Elsohaby, Attia A El-Gedawy, Ahmed M Elmoslemany
OBJECTIVES: The aim of this study was to evaluate the genetic relatedness and patterns of antimicrobial resistance amongst L. monocytogenes isolated from raw milk, milking equipment, and hand swabs from farm workers in dairy farms. METHODS: A total of 300 samples of raw milk, milking equipment, and hand swabs were collected from four dairy farms to examine the presence of Listeria species. Suspected isolates were further identified by VITEK-2 system and Polymerase Chain Reaction (PCR)...
July 21, 2017: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/28735310/an-improve-protocol-for-pcr-using-lm1-and-lm2-primers-for-listeria-monocytogenes-detection-in-food-matrices
#8
Angélica Godínez-Oviedo, Gerardo M Nava, Sofía M Arvizu-Medrano, Montserrat Hernández-Iturriaga
Several studies have observed that a conventional PCR protocol using primers LM1 and LM2 for the identification of gene hlyA Listeria monocytogenes generates non-specific PCR amplifications and false positives. For this reason in this study, we provide a modified PCR protocol that improves the specificity of the LM1 and LM2 primers.
July 6, 2017: Polish Journal of Microbiology
https://www.readbyqxmd.com/read/28730571/early-trigeminal-nerve-involvement-in-listeria-monocytogenes-rhombencephalitis-case-series-and-systematic-review
#9
William K Karlsson, Zitta Barrella Harboe, Casper Roed, Jeppe B Monrad, Mette Lindelof, Vibeke Andrée Larsen, Daniel Kondziella
Listeria monocytogenes is associated with rhombencephalitis. However, the exact mechanisms of brainstem invasion remains poorly understood. Here, we demonstrate clinical and radiological data suggesting that Listeria may invade the brainstem via the trigeminal nerve. Three females (41, 64 and 70 years) with culture proven L. monocytogenes bacteremia and rhombencephalitis were investigated in the period of 2014-16. T2-weighted and contrast-enhanced T1-weighted MRI revealed a cerebellopontine abscess in all three patients, including the involvement of the trigeminal nerve root...
July 20, 2017: Journal of Neurology
https://www.readbyqxmd.com/read/28729255/genome-sequences-of-two-listeria-monocytogenes-strains-from-nectarines-associated-with-listeriosis-in-2014
#10
Chunye Lu, Olivera Marjanovic, Christina Morales, David Kiang
Listeria monocytogenes is an important foodborne pathogen. Here, we present the annotated whole genome of Listeria monocytogenes strains F14M01297-C2 and F14M01297-C4, isolated from nectarines distributed by a packing facility in California during an investigation of listeriosis associated with stone fruit in 2014.
July 20, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28725449/therapeutic-options-for-treatment-of-human-papillomavirus-associated-cancers-novel-immunologic-vaccines-adxs11-001
#11
REVIEW
Brett Miles, Howard P Safran, Bradley J Monk
Survival of patients with advanced, recurrent, or metastatic human papillomavirus (HPV)-associated cancer is suboptimal despite the availability of various treatment modalities. The recently developed bacterial vector Listeria monocytogenes (Lm) activates innate and adaptive immune responses and is expected to offer immunologic advantages. Axalimogene filolisbac (AXAL or ADXS11-001) is a novel immunotherapeutic based on the live, irreversibly attenuated Lm fused to the nonhemolytic fragment of listeriolysin O (Lm-LLO) and secretes the Lm-LLO-HPV E7 fusion protein targeting HPV-positive tumors...
2017: Gynecologic Oncology Research and Practice
https://www.readbyqxmd.com/read/28725151/chemical-constituents-of-helichrysum-italicum-roth-g-don-essential-oil-and-their-antimicrobial-activity-against-gram-positive-and-gram-negative-bacteria-filamentous-fungi-and-candida-albicans
#12
Bouzid Djihane, Nouioua Wafa, Soltani Elkhamssa, De Haro Juan Pedro, Angeles Esteban Maria, Zerroug Mohamed Mihoub
The aerial parts of Helichrysum italicum (Roth) G. Don were subjected to hydrodistillation to obtain essential oils which had been analyzed by gas chromatography and gas chromatography coupled with mass spectrometry and tested for antimicrobial activity against 12 bacteria, two yeasts and four fungi by agar diffusion method. The essential oil yielded 0.44% (v/w) and 67 compounds accounting for 99.24% of the oil were identified with a high content of oxygenated sesquiterpenes (61.42%). The most oxygenated sesquiterpene compounds were α-Cedrene (13...
July 2017: Saudi Pharmaceutical Journal: SPJ: the Official Publication of the Saudi Pharmaceutical Society
https://www.readbyqxmd.com/read/28720964/antimicrobial-effect-of-black-pepper-petroleum-ether-extract-for-the-morphology-of-listeria-monocytogenes-and-salmonella-typhimurium
#13
Hui Tang, Wenxue Chen, Zu-Man Dou, Ronghao Chen, Yueying Hu, Weijun Chen, Haiming Chen
This study aimed to evaluate the effects of black pepper petroleum extract (BPPE) on pathogenic bacteria. The extraction from black pepper showed intense antimicrobial activity against the Gram-positive Listeria monocytogenes ATCC 19115 and the Gram-negative bacteria Salmonella typhimurium ATCC 14028. The minimum inhibitory concentrations of BPPE against L. monocytogenes and S. typhimurium were 0.625 and 1.25 mg/ml, respectively. Detection of Alkaline phosphatase outside the cell revealed that BPPE treatment destroyed the cell wall integrity...
June 2017: Journal of Food Science and Technology
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
#14
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/28713785/inactivation-of-heat-adapted-and-chlorine-adapted-listeria-monocytogenes-atcc-7644-on-tomatoes-using-sodium-dodecyl-sulphate-levulinic-acid-and-sodium-hypochlorite-solution
#15
Oluwatosin Ademola Ijabadeniyi, Elizabeth Mnyandu
The effectiveness of sodium dodecyl sulphate (SDS), sodium hypochlorite solution and levulinic acid in reducing the survival of heat adapted and chlorine adapted Listeria monocytogenes ATCC 7644 was evaluated. The results against heat adapted L. monocytognes revealed that sodium hypochlorite solution was the least effective, achieving log reduction of 2.75, 2.94 and 3.97 log colony forming unit (CFU)/mL for 1, 3 and 5 minutes, respectively. SDS was able to achieve 8 log reduction for both heat adapted and chlorine adapted bacteria...
April 13, 2017: Italian Journal of Food Safety
https://www.readbyqxmd.com/read/28713514/detection-of-eight-foodborne-bacterial-pathogens-by-oligonucleotide-array-hybridization
#16
Zohreh Nasrabadi, Reza Ranjbar, Fatemeh Poorali, Meysam Sarshar
BACKGROUND: Simultaneous and rapid detection of multiple foodborne bacterial pathogens is important for the prevention of foodborne illnesses. OBJECTIVE: The aim of this study was to evaluate the use of 16S rDNA and 23S rDNA sequences as targets for simultaneous detection of eight foodborne bacterial pathogens. METHODS: Nineteen bacterial oligonucleotide probes were synthesized and applied to nylon membranes. Digoxygenin labeled 16S rDNA and 23S rDNA from bacteria were amplified by PCR using universal primers, and the amplicons were hybridized to the membrane array...
May 2017: Electronic Physician
https://www.readbyqxmd.com/read/28713103/-listeriosis-of-central-nervous-system-in-patients-with-ulcerative-colitis-case-study
#17
Agnieszka Żak-Gołąb, Krzysztof Dąbrowski, Antoni Hrycek
In the recently an increase morbidity inflammatory bowel disease, including ulcerative colitis was observed. The use of purine analogs and their metabolites are associated with a higher incidence of infections in this group of patients. Listeriosis is an infectious disease caused by a relatively anaerobic gram-positive bacteria - Listeria monocytogenes. Common symptoms include fever, nausea, vomiting and diarrhea, but these pathogens can also cause myocarditis, central nervous system infections, including brain abscesses and sepsis...
2017: Wiadomości Lekarskie: Organ Polskiego Towarzystwa Lekarskiego
https://www.readbyqxmd.com/read/28711509/listeria-monocytogenes-pdee-a-phosphodiesterase-that-contributes-to-virulence-and-has-hydrolytic-activity-against-cyclic-mononucleotides-and-cyclic-dinucleotides
#18
Swetha Reddy, Gokul Turaga, Hossam Abdelhamed, Michelle M Banes, Robert W Wills, Mark L Lawrence
We have identified and partially characterized a putative HD domain hydrolase, LMOf2365_2464, which is highly expressed during listerial intracellular replication. LMOf2365_2464 is annotated as a putative HD domain-containing hydrolase. The ability of an isogenic mutant strain, F2365Δ2464, to adhere, invade and replicate in intestinal epithelial cells (Caco-2) was significantly lower than parent strain F2365. Colonization of mouse liver and spleen by L. monocytogenes F2365 was significantly higher than it was for the mutant...
July 12, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28711269/development-of-an-isothermal-amplification-based-assay-for-the-rapid-visual-detection-of-salmonella-bacteria
#19
Hai-Bin Liu, Yu-Xuan Zang, Xin-Jun Du, Ping Li, Shuo Wang
The efficient and timely detection of pathogens is a major concern worldwide. The aim of this study was to establish a rapid detection method for Salmonella bacteria in food samples to facilitate timely treatment. Widely used detection methods currently include culture-based methods and PCR-based methods. The former are time consuming, requiring 2 to 3 d, whereas the latter have higher accuracy but are typically complicated, requiring expertise and expensive instruments. In this study, a sensitive and rapid approach for the visual and point-of-use detection of Salmonella bacteria based on recombinase polymerase amplification (RPA) and a lateral-flow (LF) nucleic acid strip was established...
July 12, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28710947/variations-in-biofilm-formation-desiccation-resistance-and-benzalkonium-chloride-susceptibility-among-listeria-monocytogenes-strains-isolated-in-canada
#20
Marta J Piercey, Timothy C Ells, Andrew J Macintosh, Lisbeth Truelstrup Hansen
Listeria monocytogenes is a pathogenic foodborne microorganism noted for its ability to survive in the environment and food processing facilities. Survival may be related to the phenotype of individual strains including the ability to form biofilms and resist desiccation and/or sanitizer exposure. The objectives of this research were to compare 14 L. monocytogenes strains isolated from blood (3), food (6) and water (5) with respect to their benzalkonium chloride (BAC) sensitivity, desiccation resistance, and ability to form biofilm...
July 8, 2017: International Journal of Food Microbiology
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